Roots blower is a volumetric blower, also called a rotary blower, which is mainly used to transport gas. It compresses and transports gas through relative movement of two blade-shaped rotors in the cylinder, and is a type of rotary compressor.
Roots blowers have a simple structure and are easy to manufacture. They are widely used in various industrial fields, such as aquaculture oxygenation, sewage treatment aeration, cement transportation, etc. It is particularly suitable for gas delivery and pressurization systems in low-pressure situations, and can also be used as a vacuum pump.
The principle of Roots blower is to use two blade-shaped rotors to make relative motion in the cylinder to compress and transport gas.
This design makes the Roots blower have the characteristics of forced air transmission, and the air volume it delivers is proportional to the number of revolutions.
There is a slight gap between the impeller end face of the Roots blower and the front and rear end covers of the fan.
Driven by the synchronization gear, the gas is transported from the air inlet along the inner wall of the casing to the discharge side. This design makes the Roots blower relatively simple to operate and easy to maintain.
what is a root blower
Root blower working principle
The working principle of Roots blower can be simply summarized into the following steps:
1.Suction stage: When the rotor rotates, the volume of the chamber gradually increases, forming a low-pressure area.This low-pressure area attracts outside air into the chamber.
2.Compression stage: As the rotor continues to rotate, the volume of the chamber gradually decreases.This process causes the air to become compressed, increasing its pressure.
3.Exhaust stage: When the volume of the chamber reaches the minimum value, the compressed air will be discharged from the chamber.At this time, the rotation of the rotor will increase the volume of the chamber again to prepare for the next round of suction.
By repeating the above steps, the Roots blower can continuously suck in, compress and discharge air.This working principle enables Roots blowers to produce high-pressure, high-flow airflow.
Roots blower diagram
Roots blower uses
Roots blowers are widely used in many industries and fields, mainly including:
Sewage treatment: In the sewage treatment industry, roots style blowers are widely used in aeration, stirring, mixing and other aspects to ensure the smooth progress of the sewage treatment process.
Pneumatic conveying system: roots style blowers are used to transport feed, lime powder, monosodium glutamate, soybean skin, silica and other powdery materials, as well as grain suction machines or crane suction vacuum pumps in grain transportation to ensure the effectiveness of materials transmission.
Aquaculture: In aquaculture, roots style blowers use micropore aeration technology to oxygenate water quality and improve breeding efficiency.They are important equipment in the aquaculture industry.
Coal chemical industry: In the coal chemical industry, Roots blowers are used in sewage treatment and different processes, playing an important role in improving production efficiency and product quality.
Dust removal industry: Roots blowers are also used in the dust removal industry, such as desulfurization, denitrification, dust removal, etc., to ensure the effective treatment of industrial flue gas and waste gas.
Grain processing, flour mills, food factories: used in transportation, drying, cooling, dust and other links to ensure the smooth progress of the food processing process.
Paint and Coating Industry: Used for ventilation, dust removal and waste gas treatment to ensure the safety and health of the working environment.
Mining, quarrying, and mineral processing industries: used in emissions, exhaust, gas transportation, drying and other links to ensure environmental control and safety during the development of mineral resources.
Pharmaceutical Industry: In the pharmaceutical industry, Roots blowers are used in pharmaceutical processing, chemical reactions and other aspects, such as laboratory ventilation equipment, to ensure the safety and efficiency of the pharmaceutical production process.
1.Determine the cause of the fault: Before performing maintenance, you must first identify the specific fault symptoms of the blower, such as abnormal noise, increased vibration, reduced air volume, etc.
2.Power-off safety measures: Be sure to cut off the power supply before starting maintenance to ensure the safety of operators.
Disassembly and cleaning
1.Disassembly steps: Disassemble the blower in the correct order to avoid damaging components.
2.Thorough cleaning: Use appropriate tools and solvents to remove dirt and sediment from the impeller, casing, etc.
Replace damaged parts
1.Check worn parts: Check the wear of key components such as impellers, gears, and bearings.
2.Replace necessary parts: If there is any damage or serious wear, replace it with new original parts in time.
Lubrication and adjustment
1.Check the lubricating oil: Confirm whether the lubricating oil needs to be replaced and whether the oil level is appropriate.
2.Adjust the gap: Adjust the gap between the impeller and the casing, and between the impeller and the impeller to the specified value to prevent internal leakage.
Installation and testing
1.Reassembly: Reassemble the blower in the correct order.
2.Start-up test: After ensuring that everything is normal, conduct a no-load start-up test and observe the operating status.
Daily maintenance points
1.Regular inspection: including whether the fasteners are loose, whether there is oil leakage, and whether there is scaling or corrosion inside.
2.Monitor operating parameters: such as intake and exhaust pressure, bearing temperature, current changes, etc.
3.Pay attention to abnormal sounds: monitor whether there are abnormal noises during operation.
4.Add grease regularly: Make sure bearings and other moving parts are fully lubricated.
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How much does it cost to rebuild a roots blower?
Many people want to know how much a Roots blower costs. This article will introduce it to you in detail.
First, you need to understand the classification of Roots blowers.
Roots blowers can be divided into general-purpose and special-purpose types according to their uses, and can be divided into motor-driven and diesel-driven types according to their driving methods.
Therefore, the prices of different types of Roots blowers are also different.
The price of a universal Roots blower generally ranges from US$700 to US$3,000, depending on air volume, pressure, power and other parameters.
Special-purpose Roots blowers are more expensive, generally above US$15,000, because they need to be customized according to customer needs, have a long production cycle, and have high technical requirements.
There is also a difference in price between motor-driven and diesel-driven Roots blowers.
The price of motor-driven models is relatively low, generally around $3,000.
The diesel engine-driven model is more expensive, and the price of a Roots blower may reach more than 15,000 US dollars.
In addition to the price differences between different types and drive methods, factors such as product quality and quality must also be considered.
The price of high-end Roots blowers is generally more expensive than ordinary ones, but the quality and service are also more reliable.
When purchasing a Roots blower, in addition to price factors, you must also consider whether the performance parameters of the equipment meet production needs, such as air volume, pressure, power, noise, etc.
In addition, attention should also be paid to equipment maintenance and after-sales service.
In summary, the price of Roots blowers varies depending on factors such as type, driving method, quality, etc. The price of a general-purpose motor-driven type is generally between US$700 and US$3,000, while the price of a dedicated diesel-driven type may reach US$15,000. USD and above.
When purchasing, you need to make a selection based on production needs and equipment performance parameters, while paying attention to equipment maintenance and after-sales service.
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Who makes the best roots blower?
Since its establishment in the early 1990s, Longgu Heavy Industry has become a diversified machinery enterprise integrating fan and pneumatic conveying equipment system engineering. Our company has advanced computer-aided design and manufacturing, CNC machining technology, and adopts information technologies such as computer-aided design and CAPPCT to improve product design and manufacturing accuracy and shorten the design and manufacturing cycle.
Shandong Longgu Heavy Industry Machinery Co., Ltd. has imported advanced and high-precision machining equipment from many countries, including fully automatic machining centers, CNC boring and milling machines, and dynamic balancing instruments. It has a high-level, large-scale, and modern mechanical processing and manufacturing workshop.
The company has completed the implementation and control of its internal quality management system, achieving independent quality control of products from research and development design to finished product delivery. It has established and improved a full process self-control system from design and production to quality, installation, and service, providing sufficient basis and reliable guarantee for the stability and durability of products.
We have cooperated with higher education institutions such as Shandong University, Shandong University of Technology, and Southwest University of Technology to strengthen the research and development of key core technologies. We have overcome technical difficulties and developed new products such as diesel engine driven Roots blowers, water-cooled dual tank Roots blowers, and low-noise Roots blowers, filling multiple industry gaps.
At present, our company's main products include LGSR three leaf Roots blower, LGSR-V Roots vacuum pump, LGSR-H high-pressure blower series, bipolar series high-pressure, gas pressurized explosion-proof, pneumatic conveying series fans, steam compressors, LGMJ dense series fans, rotary fans, centrifugal fans, etc.
Our company's products are widely used in industries such as sewage treatment, pneumatic conveying, vacuum packaging, grain processing, electricity, petrochemicals, cement, mining, and special gas pressurized conveying.
We have close cooperative relationships with top domestic enterprises such as Sande Group, COFCO Group, and Shanshui Cement. Our company's sales outlets and after-sales service centers are located throughout the country and exported to countries such as Malaysia, India, Kyrgyzstan, Nigeria, etc.
Roots blower is a volumetric blower with impeller end face and front and rear end covers of the fan. The principle is a rotary compressor that uses two blade-shaped rotors to move relative to each other in the cylinder to compress and transport gas. This type of blower has a simple structure and is easy to manufacture. It is widely used in aquaculture oxygenation, sewage treatment aeration, cement transportation, and is more suitable for gas transportation and pressurization systems in low-pressure situations. It can also be used as a vacuum pump.
Roots blower working principle
Roots blower is a type of positive displacement fan. It has two three-bladed impellers that rotate relatively in a space sealed by the casing and wall panels. Since each impeller adopts an involute or epicycloid envelope Line, the three blades of each impeller are exactly the same, and the two impellers are also exactly the same, which greatly reduces the difficulty of processing. The impeller is processed using CNC equipment, which ensures that when the center distance between the two impellers remains unchanged, no matter where the two impellers rotate, a certain minimum gap can be maintained, thereby ensuring that gas leakage is within the allowable range.
Roots dresser blower diagram
Roots dresser blower uses
Roots blowers are widely used in many industries and fields, mainly including:
Sewage treatment: In the sewage treatment industry, roots style blowers are widely used in aeration, stirring, mixing and other aspects to ensure the smooth progress of the sewage treatment process.
Pneumatic conveying system: roots style blowers are used to transport feed, lime powder, monosodium glutamate, soybean skin, silica and other powdery materials, as well as grain suction machines or crane suction vacuum pumps in grain transportation to ensure the effectiveness of materials transmission.
Aquaculture: In aquaculture, roots style blowers use micropore aeration technology to oxygenate water quality and improve breeding efficiency.They are important equipment in the aquaculture industry.
Coal chemical industry: In the coal chemical industry, Roots blowers are used in sewage treatment and different processes, playing an important role in improving production efficiency and product quality.
Dust removal industry: Roots blowers are also used in the dust removal industry, such as desulfurization, denitrification, dust removal, etc., to ensure the effective treatment of industrial flue gas and waste gas.
Grain processing, flour mills, food factories: used in transportation, drying, cooling, dust and other links to ensure the smooth progress of the food processing process.
Paint and Coating Industry: Used for ventilation, dust removal and waste gas treatment to ensure the safety and health of the working environment.
Mining, quarrying, and mineral processing industries: used in emissions, exhaust, gas transportation, drying and other links to ensure environmental control and safety during the development of mineral resources.
Pharmaceutical Industry: In the pharmaceutical industry, Roots blowers are used in pharmaceutical processing, chemical reactions and other aspects, such as laboratory ventilation equipment, to ensure the safety and efficiency of the pharmaceutical production process.
What is the difference between a Roots blower and a blower?
Roots blowers and blowers both belong to the category of centrifugal fans, but they are very different in structure and working principle:
Structural differences The unique structure of the Roots blower is composed of an outer rotor and an inner rotor. The two rotors mesh with each other to produce the effect of gas compression and transportation. This structure has the advantages of small size, low noise, no vibration and no oil pollution. The blower generates airflow through the rotation of the impeller in the casing, and then compresses and transports the airflow through the action of the air guide assembly. The blower has the advantages of compact structure, low energy consumption and long service life.
Differences in working principles Roots blower generates gas compression and transportation effects in the casing through the mutual meshing of two rotors. Roots blowers usually rotate at very high speeds, so they require specialized care and maintenance when working. The blower generates airflow through the rotation of the impeller, and then compresses and transports the airflow through the cooperation of the guide components. The working speed of the blower is usually low and the operation is simple, so you need to pay attention to correct operation and maintenance during use.
What are the benefits of a Roots blower?
High efficiency: Due to its internal sealing structure, the Roots blower can avoid gas leakage while transporting air flow, thereby achieving efficient and stable gas transport. Moreover, its operation efficiency is high and it can save certain costs in terms of energy consumption.
Low noise: Compared with other types of blowers, Roots blowers have very low noise. This is due to the special noise elimination technology used in its design, which can ensure that the noise during operation is controlled within a reasonable range. It is especially suitable for Noise-sensitive work environment.
Large displacement: Roots blowers can provide a large amount of gas transportation capacity. In the industrial production process, a large amount of gas is often needed to drive production equipment. At this time, Roots blowers can take advantage of their large displacement characteristics, thus better to meet the needs of the production process.
Wear resistance: The internal structure of the Roots blower is reasonably designed, and there will be no friction or collision between the master rotor and the slave rotor, thereby avoiding wear and tear of machine parts. At the same time, in terms of manufacturing process, wear-resistant and corrosion-resistant materials are used to ensure the long-term use of the machine.
Strong adaptability: Roots blowers can adapt to different working conditions such as various gases, pressures, flows, etc. Roots blowers can adapt to the different media such as high pressure, high temperature, corrosion, viscosity, etc. that are often encountered in industrial production. able to meet needs.
Who makes the best roots dresser blower?
Since its establishment in the early 1990s, Longgu Heavy Industry has become a diversified machinery enterprise integrating fan and pneumatic conveying equipment system engineering. Our company has advanced computer-aided design and manufacturing, CNC machining technology, and adopts information technologies such as computer-aided design and CAPPCT to improve product design and manufacturing accuracy and shorten the design and manufacturing cycle.
Shandong Longgu Heavy Industry Machinery Co., Ltd. has imported advanced and high-precision machining equipment from many countries, including fully automatic machining centers, CNC boring and milling machines, and dynamic balancing instruments. It has a high-level, large-scale, and modern mechanical processing and manufacturing workshop.
The company has completed the implementation and control of its internal quality management system, achieving independent quality control of products from research and development design to finished product delivery. It has established and improved a full process self-control system from design and production to quality, installation, and service, providing sufficient basis and reliable guarantee for the stability and durability of products.
We have cooperated with higher education institutions such as Shandong University, Shandong University of Technology, and Southwest University of Technology to strengthen the research and development of key core technologies. We have overcome technical difficulties and developed new products such as diesel engine driven Roots blowers, water-cooled dual tank Roots blowers, and low-noise Roots blowers, filling multiple industry gaps.
At present, our company's main products include LGSR three leaf Roots blower, LGSR-V Roots vacuum pump, LGSR-H high-pressure blower series, bipolar series high-pressure, gas pressurized explosion-proof, pneumatic conveying series fans, steam compressors, LGMJ dense series fans, rotary fans, centrifugal fans, etc.
Our company's products are widely used in industries such as sewage treatment, pneumatic conveying, vacuum packaging, grain processing, electricity, petrochemicals, cement, mining, and special gas pressurized conveying.
We have close cooperative relationships with top domestic enterprises such as Sande Group, COFCO Group, and Shanshui Cement. Our company's sales outlets and after-sales service centers are located throughout the country and exported to countries such as Malaysia, India, Kyrgyzstan, Nigeria, etc.
Roots blower is a volumetric fan, with impeller end face and front and rear end covers of the fan. The principle is a rotary compressor that uses two blade-shaped rotors to move relative to each other in the cylinder to compress and transport gas. This type of blower has a simple structure and is easy to manufacture. It is widely used in aquaculture oxygenation, sewage treatment aeration, cement transportation, and is more suitable for gas transportation and pressurization systems in low-pressure situations. It can also be used as a vacuum pump.
roots rotary lobe blower
Roots rotary lobe blower manual
1.Usage requirements:
(1) The inlet air temperature is not greater than 40°C
(2) The content of solid particles in the gas shall not be greater than 100 mg/m2, and the largest particle shall not be greater than half of the assembly gap;
(3) The bearing temperature does not exceed 95°C;
(4) The lubricating oil temperature does not exceed 65°C;
(5) The opening pressure range specified on the sign shall not be exceeded.
2.Preparations before startup:
(1) Check the installation quality of each fastener and positioning pin;
(2) Check the installation quality of intake and exhaust pipes and valves;
(3) Check whether the base of the unit is fully padded and whether the anchor bolts are tightened;
(4) Inject the specified brand of lubricating oil into the gear box to the driving side of the oil mark position and inject the specified grease in sufficient quantity;
(5) Open all the blower inlet and exhaust valves, turn the rotor, and listen carefully for any abnormal noises from various parts;
(6) For fans with water cooling requirements, the water temperature should not be higher than 25°C.
3.No-load test operation of the fan:
(1) Newly installed or overhauled fans should undergo no-load test operation;
(2) No-load operation means putting into operation with the intake and exhaust valves fully open;
(3) There is no abnormal smell, smoke, collision or friction sound, and the radial vibration of the bearing part is not greater than 6.3mm/s;
(4) Run with no load for about 30 minutes. If the situation is normal, it can be put into operation with load. If abnormal operation is found, stop the machine immediately for inspection. After troubleshooting, it still needs to run with no load.
4.Continuous operation under normal load:
(1) It is required to gradually and slowly increase the voltage and bring the load up to the rated load. It is not allowed to adjust to the rated load at one time;
(2) During normal operation of the fan, it is strictly prohibited to completely close the engine and exhaust valves; nor is it allowed to operate overloaded;
(3) Due to the characteristics of the fan, it is not allowed to directly backflow the exhaust gas for a long time, so cooling measures must be taken;
(4) The blower should not stop suddenly under full load to avoid damage to parts.
What are roots blowers used for?
1.Used for ventilation: Roots blowers can quickly transport gas from one area to another. Indoor ventilation is relatively common, so that good air quality and a comfortable working environment can be maintained. .
2.Used for waste gas emission: In some industrial processes, a large amount of waste gas will be produced, which needs to be discharged, otherwise it will cause environmental pollution. The Roots blower can quickly discharge these waste gases to ensure the safety of the production process.
3.Used for pressurized transportation: In some industrial fields, such as water treatment, paper manufacturing, power generation, etc., compressed air needs to be transported to drive equipment and production processes. Roots blowers can compress gas and transport it to the required area.
4.Use in other fields: Roots blowers can also be used in sewage treatment, dust collection, paint spraying, food processing, equipment and other fields, and their value is relatively wide.
As the superficial gas velocity increases, the particle density becomes uniform, the force of particle suspension and acceleration is equal to the particle static pressure head, the gas-solid phase approaches plug flow, and the radial void ratio is evenly distributed.
What is dense phase conveying?
Dense phase transportation is a process that uses airflow to transport solid powdery materials. When the density of the particle flow in the pipeline is close to the bed density in the critical fluidized state, it is called dense phase transportation.
Characteristics of dense phase transportation
Small gas flow: The gas flow required for dense phase transportation is small, and generally the material mass transported by unit mass of air is relatively large.
Large air flow pressure drop: The air flow pressure drop is large, the movement speed of particles is low, but the wear between particles and pipelines is small.
Short conveying distance: Commonly found in catalyst circulation pipes in petroleum catalytic cracking and overflow pipe equipment in multi-jet fluidized beds, the conveying distance is generally relatively short.
What is the difference between dilute and dense phase pneumatic conveying?
Dilute phase pneumatic conveying usually refers to a gas-solid two-phase mixture with smaller particles suspended in the gas, also known as gas suspension conveying. In dilute-phase pneumatic conveying, the interaction force between gas and solid particles is smaller, and there are fewer contacts and collisions between particles. Dilute phase pneumatic conveying is suitable for conveying smaller particles and powders. The conveying speed is fast, but the conveying volume is relatively small, and it is prone to problems such as particle clogging and gas leakage.
Dense phase pneumatic conveying refers to a gas-solid two-phase mixture with larger particles suspended in the gas, also known as gaseous fluidized bed conveying.
In dense phase pneumatic conveying, the interaction force between gas and solid particles is relatively large, and contact and collision between particles often occur.
Dense phase pneumatic conveying is suitable for conveying larger particles and materials with greater adhesion between particles.
The conveying volume is relatively large, but the conveying speed is relatively slow.
Therefore, the difference between dilute phase pneumatic conveying and dense phase pneumatic conveying lies in the particle size of the conveyed material and the interaction force between the gas and solid phases, as well as the applicable conveying conditions and restrictions.
Centrifugal fans are divided into three types: static pressure centrifugal fans, dynamic pressure centrifugal fans and diagonal flow centrifugal fans.
1.Static pressure centrifugal fan
Static pressure centrifugal fans are suitable for occasions requiring larger air volume and lower wind pressure, such as ventilation and air conditioning and refrigeration. Their transmission pressure (static pressure) generally does not exceed 2000Pa. Static pressure centrifugal fans can be divided into forward curved plate centrifugal fans, back curved plate centrifugal fans, right angle centrifugal fans and medium pressure centrifugal fans.The front curved plate centrifugal fan has a set of aluminum curved plates in front of the impeller, which allows the gas entering the impeller to flow to the blades, improving energy utilization and achieving higher static pressure and efficiency. The rear curved plate centrifugal fan has a set of aluminum curved plates behind the impeller to better utilize gas energy and improve efficiency. The right-angle centrifugal fan has a wind direction curve of 90 degrees and has high static pressure. It is suitable for air conditioning supply and exhaust systems. Medium-pressure centrifugal fans are suitable for larger gas flows and pressures, and can meet higher system efficiency.
2.Dynamic pressure centrifugal fan
The transmission pressure (static pressure) of dynamic pressure centrifugal fans is usually above 2000Pa, and is suitable for occasions that require higher wind pressure or require long-distance gas transportation, such as industrial production lines, processes, smelting, etc. Dynamic pressure centrifugal fans can be divided into two types: single suction type and double suction type. The single-suction dynamic pressure centrifugal fan has a shorter suction section and is suitable for transporting gases with less dust, such as fresh air supply and return systems. The double-suction dynamic pressure centrifugal fan has a longer suction section and is suitable for conveying dust-containing gas or where both ends need to be connected to pipes.
3.Oblique flow centrifugal fan
The oblique flow centrifugal fan is a new type of centrifugal fan, suitable for large-scale air supply or exhaust situations. Its air volume can reach 600000m³/h and its static pressure can reach 750Pa. The advantages of this type of fan are high efficiency, low noise, large air volume, small and lightweight, and are generally widely used in industrial environments such as metallurgical industry, buildings, and petrochemical industries.
centrifugal fans a price
Which type of centrifugal fan is the most efficient?
Impeller centrifugal fans have stronger wind power. Impeller centrifugal fans are divided into two types: forward curved blade type and rear curved blade type. The front curved blade centrifugal fan is suitable for transporting high-speed airflow (i.e. small wind resistance), which can improve operating efficiency; the rear curved blade centrifugal fan is suitable for transporting high pressure, high temperature, high humidity, high viscosity, high dust gas and corrosion sexual gas because its structure is stronger.
How to judge whether a centrifugal fan is good or bad
1.Whether the centrifugal fan performance meets the standard static pressure exhaust volume and meets the standard performance can achieve the air supply volume required by the specific system;
2.How high is the efficiency of the centrifugal fan? High efficiency of the fan saves electricity. High efficiency of the fan saves electricity;
3.How high is the vibration value at the position of the rolling bearing? Fan bearings with high vibration values are easily damaged, while bearings with low vibration values have a long service life;
4.What is the operating noise? Noise is air pollution, harms working mood, and also consumes energy;
5.Have you considered the convenience of maintenance? Centrifugal fans are equipment that require regular maintenance, and the oil supply holes, exhaust holes, inspection ports, and rolling bearings should be easily disassembled;
6.Generally speaking, you can know the advantages and disadvantages of a centrifugal fan by looking at its appearance. If you keep improving the position, centrifugal fans are generally very good.
Which type of centrifugal fan is the most efficient?
Impeller centrifugal fans have stronger wind power. Impeller centrifugal fans are divided into two types: forward curved blade type and rear curved blade type.
The front curved blade centrifugal fan is suitable for transporting high-speed airflow (i.e. small wind resistance), which can improve operating efficiency; the rear curved blade centrifugal fan is suitable for transporting high pressure, high temperature, high humidity, high viscosity, high dust gas and corrosion sexual gas because its structure is stronger.
best centrifugal fans a
What are the three types of centrifugal fans?
Centrifugal fans are divided into three types: static pressure centrifugal fans, dynamic pressure centrifugal fans and diagonal flow centrifugal fans.
1.Static pressure centrifugal fan
Static pressure centrifugal fans are suitable for occasions requiring larger air volume and lower wind pressure, such as ventilation and air conditioning and refrigeration. Their transmission pressure (static pressure) generally does not exceed 2000Pa. Static pressure centrifugal fans can be divided into forward curved plate centrifugal fans, back curved plate centrifugal fans, right angle centrifugal fans and medium pressure centrifugal fans.The front curved plate centrifugal fan has a set of aluminum curved plates in front of the impeller, which allows the gas entering the impeller to flow to the blades, improving energy utilization and achieving higher static pressure and efficiency. The rear curved plate centrifugal fan has a set of aluminum curved plates behind the impeller to better utilize gas energy and improve efficiency. The right-angle centrifugal fan has a wind direction curve of 90 degrees and has high static pressure. It is suitable for air conditioning supply and exhaust systems. Medium-pressure centrifugal fans are suitable for larger gas flows and pressures, and can meet higher system efficiency.
2.Dynamic pressure centrifugal fan
The transmission pressure (static pressure) of dynamic pressure centrifugal fans is usually above 2000Pa, and is suitable for occasions that require higher wind pressure or require long-distance gas transportation, such as industrial production lines, processes, smelting, etc. Dynamic pressure centrifugal fans can be divided into two types: single suction type and double suction type. The single-suction dynamic pressure centrifugal fan has a shorter suction section and is suitable for transporting gases with less dust, such as fresh air supply and return systems. The double-suction dynamic pressure centrifugal fan has a longer suction section and is suitable for conveying dust-containing gas or where both ends need to be connected to pipes.
3.Oblique flow centrifugal fan
The oblique flow centrifugal fan is a new type of centrifugal fan, suitable for large-scale air supply or exhaust situations. Its air volume can reach 600000m³/h and its static pressure can reach 750Pa. The advantages of this type of fan are high efficiency, low noise, large air volume, small and lightweight, and are generally widely used in industrial environments such as metallurgical industry, buildings, and petrochemical industries.
The centrifugal blower is a machine that relies on input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine.
Working principle of centrifugal fan
The centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses a high-speed rotating impeller to accelerate the gas, then decelerates and changes the flow direction, so that the kinetic energy is converted into potential energy (pressure).In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when the gas flows through the impeller, and then enters the diffuser.
In a diffuser, the gas changes direction of flow causing deceleration, which converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller and secondarily during the pressure expansion process. In multi-stage centrifugal fans, a reflux is used to direct the airflow into the next impeller, creating higher pressure.
What is the difference between a blower and a centrifugal fan?
1.Structural differences
A blower is usually a rotating cylindrical structure consisting of a set of impellers and a casing. An impeller usually consists of a set of curved blades that are fixed to a shaft and create airflow as they rotate. The casing is usually a closed cylindrical structure, and the gap between it and the impeller is very small so that the airflow does not leak.
The structure of a centrifugal fan is slightly different from a blower. It usually consists of a rotating impeller and a casing. An impeller is usually composed of multiple curved blades that are fixed on a shaft and generate airflow when rotating. The housing is usually a conical structure, and its shape can be adjusted according to different application requirements. Unlike a blower, the gap between the impeller and the casing of a centrifugal fan is relatively large, allowing the airflow to pass through more smoothly.
2.Differences in working principles
A blower works by creating airflow through a rotating impeller, which is then pushed toward the housing, creating a high-pressure area. The air flows from the high-pressure area to the low-pressure area, forming an air flow circulation system. A blower works like a pump, pushing gas to the outside through a rotating impeller.
The working principle of a centrifugal fan is also to generate airflow through a rotating impeller, but it is different from a blower in that the airflow it generates is pushed to the outside by centrifugal force. As the impeller spins, it pushes the gas toward the ends of the blades, which then pushes the gas toward the outside. The centrifugal force makes the air flow smoothly through the centrifugal fan.
3.Application differences
Due to the structure and working principle of the blower, it is usually used in applications requiring high-pressure air flow, such as air blowing, gas delivery and drying. The blower can generate high-pressure air flow to make the gas flow quickly in the pipeline, thereby realizing various industrial production processes.
Centrifugal fans have a wider range of applications. Due to its structure and working principle, centrifugal fans can be used in a variety of different applications such as air conditioning systems, gas turbines, boiler ventilation, industrial waste gas treatment, etc.
What is the function of centrifugal fan blower?
Centrifugal blower is a common fluid mechanical equipment that transports or compresses gas through centrifugal force. It is widely used in various industries such as metallurgy, chemical industry, electric power, and water treatment. Its main functions include the following aspects:
1.Air delivery: Centrifugal blowers can deliver a certain flow of air to a designated location. For example, in the industrial production process, air needs to be transported to sintering furnaces, furnaces and other equipment, and centrifugal blowers can play an important role.
2.Compressed air: A centrifugal blower can compress air at atmospheric pressure into high-pressure gas. In fields such as chemical industry and petroleum, air compressors can provide the required compressed air for program operations, equipment opening, and combustion.
3.Exhaust gas: In some production processes, some toxic and harmful gases will be produced, which need to be discharged through the exhaust system. Centrifugal blower is one of the important exhaust equipment.
What is the difference between a centrifugal fan and a normal fan?
1.Definition and working principle
A centrifugal fan is a machine that uses the rotation of an impeller to generate centrifugal force to suck gas in from the air inlet and discharge the gas. An ordinary fan is a machine that generates pressure in the air through the rotation of the blades, thereby transporting gas.
2.Performance characteristics
The performance curve of centrifugal fans is relatively flat and they can provide a certain amount of air volume even at low flow rates, while ordinary fans are less efficient at low flow rates. Centrifugal fans perform better when handling large air volumes, while ordinary fans are more suitable for small air volumes and high-pressure working environments.
3.Structural features
Centrifugal fans usually consist of a casing, impeller, bearings, motor, etc., and have a relatively complex structure. Ordinary fans are relatively simple. Centrifugal fans are less noisy because their working principle makes them produce less noise.
4.Application fields
Centrifugal fans are usually used in ventilation systems, air handling systems, etc., especially in environments that require large air volumes and are sensitive to noise. Ordinary fans are more commonly used in small equipment or environments that require high pressure.
5.Maintenance
The maintenance of centrifugal fans is relatively complicated, requiring regular replacement of bearings and cleaning of the casing, while the maintenance of ordinary fans is relatively simple. After long-term operation, both fans need to be cleaned to ensure their working effect and extend their service life.
6.Cost and efficiency
The price and maintenance costs of centrifugal fans are usually higher than ordinary fans, but due to their performance characteristics and operational stability, they may increase efficiency and reduce operating costs in some situations. When selecting a fan, the actual application needs and budget should be considered to select the most suitable model.
Rotary valve, also known as unloading valve and star unloader, is a mechanical device that changes the valve from the open position to the closed position by rotating a rotating component such as a rotating baffle.
A rotary valve is a device that achieves fluid control by rotating a valve. In a rotary valve, the opening and closing, regulation, distribution, etc. of the fluid in the pipeline are controlled through the rotation of the valve. Therefore, the rotary valve is often called a revolving door. Rotary valves usually consist of a valve body, a valve shaft and a valve sealing ring.
Rotary valve working principle
The working principle of the rotary valve is mainly based on its design structure and working mechanism. The rotary valve usually consists of a rotor blade.
When the material in the upper bin falls by its own weight and fills the space of the rotor blade, as the blade rotates, the material is taken to the lower outlet and discharged, thereby achieving continuous feeding and unloading. function of the material.
This design is particularly important in pneumatic conveying systems because it can not only supply materials, but also lock the air flow.
Through the low-speed rotation of the rotor and the extremely small gap between the rotor and the inner cavity of the housing, it effectively prevents the reverse flow of the air flow, thereby maintaining The air pressure in the system is stable and the materials are discharged normally.
The self-cleaning rotary valve is improved on the basis of ordinary rotary valves. By adding a cleaning blade (scraper), it can automatically remove the residual material on the rotor while dosing the material quantitatively.
It is especially suitable for sticky and easy-to-stick valves. block of special materials. Its working principle involves the coordinated work of two upper and lower rotors: the upper rotor is equipped with blades for quantitative feeding, while the lower rotor is equipped with a cleaning blade, which uses the difference in rotational speed of the upper and lower rotors to achieve self-cleaning while quantitatively feeding.
The working principle of the eccentric rotary valve is to use an eccentrically rotating sector-shaped ball valve to open and close the valve through the engagement and separation of the eccentric ball crown and the valve seat. When opening, the ball core separates from the valve seat; when closing, the ball core gradually contacts the valve seat, exerting a compressing force on the valve seat.
Rotary valve diagram
What is a rotary valve used for?
Specific uses for rotary valves include:
Unloading: In the negative pressure pneumatic conveying system, the rotary valve is installed under the cyclone separator and dust collector as an unloader to unload materials.
Air lock: Through low-speed rotation and a very small gap between the rotor and the inner cavity of the housing, the rotary valve effectively prevents the reverse flow of air and keeps the air pressure in the system stable.
Feeding: In the pneumatic conveying system, the rotary valve continuously supplies material to ensure the normal discharge of materials.
Prevent clogging: The rotary valve can transport materials evenly and continuously, prevent gas and solid materials from accumulating in the pipeline, and avoid blockage and leakage.
The rotary feeder is also called a rotary valve, a star feeder, and an air lock.
The usual structure of a rotary feeder is that a rotor with several blades rotates in a cylindrical casing. Materials fall from the upper hopper and are filled.
In the space between the blades, it is discharged as the blades rotate to the lower part.
There is a pressure equalizing exhaust port on the side of the body, which can discharge the high-pressure gas brought by the rotation of the impeller, reducing the phenomenon of gas pushing and conducive to the smooth flow of materials.
The drop is one of the main components of the pressure-feeding and suction-feeding pneumatic conveying systems, and the rotary feeder type. It can feed materials into the clinker pipe evenly and continuously, and in the separation and dust collection part of the system, it It also has the functions of unloader and air lock.
Rotary feeder working principle
The working principle of the rotary feeder is that the driving device drives the spiral scraper or the turntable to rotate.
The material is pushed and frictioned by the spiral scraper or centrifugal force, and is continuously transported or transported upward along the movement direction of the spiral scraper or turntable.
It is thrown away from the turntable and finally discharged from the discharge port or falls freely in the air to realize the transportation and diffusion of materials.
Rotary feeder, also known as rotary feeder, is a commonly used material conveying equipment and is widely used in mining, building materials, chemical industry, metallurgy and other industries.
It uses a rotating spiral scraper or turntable to transport materials from the bottom of the container or the turntable to the upper discharge port or throw them away from the turntable to achieve continuous feeding and transportation of materials.
This kind of equipment consists of spiral scrapers, bearings, transmission devices, etc. Its working principle is simply to use friction and pushing to transport materials along the movement direction of the spiral blades or turntable through the rotating spiral blades or turntable. .
Specifically, when the drive device is started, it drives the spiral scraper or turntable to rotate. Material falls from the upper hopper and fills the space in the spiral scraper or turntable. As it rotates, the material is pushed and rubbed, and is continuously transported upward along the movement direction of the spiral scraper or turntable.
When the material reaches the edge of the turntable, it will be discharged from the discharge port, or it will fall freely in the air to realize the transportation and diffusion of the material. This design not only ensures the uniform transportation of materials, but also reduces the phenomenon of gas ejection, which is conducive to the smooth falling of materials.
In addition, the rotary feeder also has the characteristics of simple structure and easy maintenance. It can be customized according to different production needs, so it plays an important role in the production line.
