作者：lgblower

How does a roots blower work

• Working principle:
• Roots blower works with two rotors meshing with each other. When the gear drives the rotor to rotate, relative motion occurs between the two rotors, thereby forming airflow. One of the rotors is called the main rotor and the other is the passive rotor. The gear of the main rotor drives the passive rotor, which rotates simultaneously but in opposite directions. Gas is continuously entered and discharged in the gap between the two rotors, thereby generating pressure or extracting exhaust gas.
• Structural features:
• The rotor and casing of Roots blowers are usually made of high-strength alloy materials to ensure their durability and stability. The rotor surface is covered with coating to reduce internal friction and wear. In addition, the Roots blower is equipped with a cooling system to ensure the heat dissipation effect of the equipment during long-term operation.

how does a roots blower work

Roots blower diagram

Roots blower specifications

Roots blower uses

• Roots blowers have a very wide range of applications and are mainly used in the following fields:
• ‌Aquaculture‌: Used to increase oxygen in fish ponds, increase breeding density, and increase production.
• ‌Sewage treatment‌: Used in the sewage treatment process for aeration, oxygenation, and backwashing to provide dissolved oxygen for aerobic bacteria in the water body and provide power for stirring the water body.
• ‌Cement Conveying‌: Used to transport cement and other powdery materials in cement production.
• ‌Power industry‌: used for combustion, pressurization, desulfurization, etc.
• ‌Other industrial applications‌: Including pneumatic transportation (such as transportation of small particles and powdery materials such as grain, cement, fly ash, etc.), mixing, composting, fermentation, drying air, vacuum suction, etc.

Roots blower pressure range

• The normal working pressure range of Roots blower is between 9.8kpa and 98kpa.
• This range can meet the needs of most industrial applications.
• However, for some special large-scale equipment or high-demand occasions, the pressure of Roots blower can even reach more than 140kpa.
• In addition, Roots blowers can also be divided into three types: low pressure, medium pressure and high pressure according to different pressures.
• Generally, those with a pressure between 9.8kpa and 58.8kpa are called low-pressure Roots blowers, while those with a pressure between 58.8kpa and 98kpa are called high-pressure Roots blowers. When the pressure exceeds 98kpa, it belongs to the high-pressure series.

Roots blower company

• 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 for pneumatic conveying

• Roots blower is a positive displacement blower. It mainly transports gas through the change in the working chamber volume formed by the rotation of two rotors with an involute or similar shape. This type of blower works similarly to a gear pump, with each rotor functionally equivalent to a two-tooth gear.

roots blower for pneumatic conveying

What are roots blowers used for?

• ‌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.

Does a Roots blower compress air?

• The wind generated by Roots blowers is not typical compressed air. Although Roots blowers increase the pressure of gases, they work differently than typical compressed air equipment such as compressors. Roots blowers primarily push gas into a pipe through a rotating impeller rather than increasing gas pressure through a compression process.

What is the difference between a Roots blower and a blower?

• 1.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.
• 2.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.

Lean and dense phase conveying

• Dilute phase conveying system
• The dilute phase conveying system uses compressed gas as kinetic energy to transport materials suspended in the air flow along the pipeline. The materials during the transportation process will form a gas-solid two-phase mixture with the gas.
• Applicable materials: powdery, granular, liquid and other dry materials, often used for conveying materials with good fluidity.
• Advantages:
  (1) Since the material has a low packing density and forms a gas-solid two-phase mixture with gas, the gaps between the materials are large, which can effectively avoid pipeline blockage during transportation.
  (2) The material-gas ratio is small, the conveying speed is fast, and it is suitable for short conveying distances.
  (3) The equipment structure is relatively simple, without too many valves, and maintenance is simple.
• Disadvantages: The conveying efficiency is low and it is easy to cause wear to the material due to too fast flow rate.
• Dense phase conveying system
• The dense phase conveying system promotes denser materials to be conveyed to the discharge point at a relatively low conveying speed by creating a pressure difference within the pipeline.
• Applicable materials: bulk materials with large particles and larger particle sizes, often used for conveying coal, ore, etc.
• Advantages:
  (1) The dense phase conveying system is suitable for large flow conveying requirements and long conveying distance.
  (2) The material-gas ratio is high, the transportation is stable, and the wear on the materials is low.
  (3) The energy consumption is relatively low, it can effectively reduce the emission of dust pollution, and is more environmentally friendly.
• Disadvantages: Due to the high density of materials in the system, blockage may occur.

What is roots air blower

• Roots blower is a positive displacement blower. It mainly transports gas through the change in the working chamber volume formed by the rotation of two rotors with an involute or similar shape. This type of blower works similarly to a gear pump, with each rotor functionally equivalent to a two-tooth gear.

Main features of Roots blower

• 1.Simple structure and easy manufacturing: The design of the Roots blower is relatively simple and the manufacturing process is relatively easy.
• 2.Wide scope of application: It is widely used in aquaculture oxygenation, sewage treatment aeration, cement transportation and other fields. It is also suitable for gas transportation and pressurization systems in low-pressure situations, and can even be used as a vacuum pump.
• 3.The air volume is proportional to the rotational speed: The air volume of the Roots blower is proportional to the rotational speed of the rotor, so the air volume can be controlled by adjusting the rotational speed.
• 4.Diverse transmission media: it can transport clean air, clean gas, sulfur dioxide and other inert gases, etc.
• 5.Lower vibration and noise: Compared with the two-bladed rotor, the three-bladed rotor has smaller gas pulsation and vibration, so the noise is also relatively low.

what is roots air blower

Roots blower structure and types

• Roots blowers can be divided into two-blade and three-blade types according to the shape of the rotor.
• During the operation of the three-blade rotor, the two rotors perform three suction and exhaust operations for each rotation.
• The gas pulsation is small, the vibration is small, and the noise is low.
• In addition, Roots blowers can also be divided into single-stage and double-stage series blowers according to the working mode; divided into vertical blowers, horizontal blowers, vertical shaft blowers, dense group blowers according to the structure; divided into labyrinth according to the sealing type Seals, expansion ring seals, packing seals and mechanical seals, etc.

Root blower working principle

• The working principle of the Roots blower is to separate the air inlet and exhaust port through the "meshing" of a pair of rotors.
• The rotors are driven by a pair of synchronous gears to rotate at a constant speed in opposite directions, and the inhaled gas is discharged from the air without internal compression.
• The suction port moves to the exhaust port, and the moment the gas reaches the exhaust port, it is pressurized and transported due to the return flow of high-pressure gas on the exhaust side. ‌‌
• Roots blower is a positive displacement blower.
• Its working principle is based on the relative movement of two blade-shaped rotors 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 other occasions.
• It is especially suitable for gas transportation and pressurization systems in low-pressure situations, and can also be used as a vacuum pump.
• There is a certain gap between the rotors of the Roots blower and they do not contact each other.
• This design allows the impeller to rotate without friction and does not require lubrication. Its operating temperature is usually not greater than 40°C.

Roots blower specifications

Roots blower diagram

Roots blower company

• 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.

What is a roots blower 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.

Roots blower diagram

Roots blower specifications

Root blower working principle

• The working principle of the Roots blower is to separate the air inlet and exhaust port through the "meshing" of a pair of rotors.
• The rotors are driven by a pair of synchronous gears to rotate at a constant speed in opposite directions, and the inhaled gas is discharged from the air without internal compression.
• The suction port moves to the exhaust port, and the moment the gas reaches the exhaust port, it is pressurized and transported due to the return flow of high-pressure gas on the exhaust side.
• Roots blower is a positive displacement blower. Its working principle is based on the relative movement of two blade-shaped rotors 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 other occasions.
• It is especially suitable for gas transportation and pressurization systems in low-pressure situations, and can also be used as a vacuum pump.
• There is a certain gap between the rotors of the Roots blower and they do not contact each other.
• This design allows the impeller to rotate without friction and does not require lubrication. Its operating temperature is usually not greater than 40°C.

What is a roots blower used for?

Roots blower pressure range

• According to different usage requirements, the pressure of the Roots blower can be adjusted between 9.8kpa and 200kpa.Within this pressure range, the Roots blower can work normally and meet various process requirements.Specifically, the pressure range of Roots blowers includes:
• ‌Low pressure range‌: The pressure is lower than 58.8kpa, including 9.8kpa to 58.8kpa.This type of fan usually uses air cooling, and is mostly designed with a single oil tank.
• ‌Medium pressure range‌: The pressure is between 58.8kpa and 98kpa.This type of fan requires water cooling, and most of them are designed with double oil tanks.
• ‌High pressure range‌: When the pressure exceeds 98kpa, especially when it exceeds 140kpa, double-stage pressure boosting technology is required to ensure stable operation of the fan under high pressure.

Rotary lobe blower roots

• 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.

rotary lobe blower roots

Roots rotary lobe blower manual

• How to use
• 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.
• 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.
• 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.
• 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.
• Maintenance and overhaul:
  (1) Check the fastening of each part and whether the positioning pin is loose;
  (2) Check the machine body frequently for oil leakage;
  (3) Pay attention to whether the lubrication is normal, pay attention to the amount of lubricating grease, always listen to the operation of the fan to see if there is any noise, and pay attention to whether the unit is operating under specified working conditions;
  (4) Lubricating oil (grease): The lubricating oil is medium-load industrial gear oil (grade 220, kinematic viscosity 198~242mm2/s40℃, flash point ≥200℃); the grease is butter (synthetic lithium-based grease penetration 220250 , dropping point ≥190℃), after 200 hours of operation, the oil and grease must be changed for the first time, and for the second time after one month of operation. In the future, it should be replaced according to the usage environment and oil (grease) quality. It is recommended to replace it every three months;
  (5) Check the air inlet gas filter frequently and clean or replace the filter in time;
  (6) The overload of the blower is sometimes not displayed immediately, so pay attention to the increase trend of the inlet and exhaust pressure, bearing temperature and motor current to judge whether the fan is operating normally;
  (7) Before disassembling the machine, the dimensions of the machine should be measured, recorded, and marked on the parts to ensure that the original coordination requirements are maintained after assembly;
  (8) After a new machine or overhaul, the fuel tank should be cleaned and put into operation according to the usage procedures. It is recommended to replace all lubricating grease after 8 hours of operation.

rotary lobe blower roots

Roots blower manufacturers

• 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 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.