作者：lgblower

What is the rotary valve?

• A rotary valve is a mechanical device that controls fluid regulation by rotating parts such as a rotating baffle to change the valve from the open position to the closed position. ‌‌
• The working principle of the rotary valve is based on the rotor with several blades rotating in the cylindrical casing. The material falls from the upper hopper, fills the space between the blades, and is discharged as the blades rotate.
• This kind of equipment usually consists of a rotor, a casing, a seal, a motor, a reducer, etc., and can achieve uniform and continuous material transportation.
• Rotary valves are widely used in industry, especially in pneumatic conveying systems. They can evenly and continuously supply materials to the feeding pipe. They are suitable for positive or negative pressure pneumatic conveying systems, pulse dust removal equipment, precision feeding and other occasions. .
• The rotary valve has the characteristics of compact structure, beautiful appearance, good air locking performance, stable operation, uniform blanking, light weight and energy saving. It can play the role of feeding and locking the air flow, effectively preventing the reverse flow of the air flow and ensuring the safety of the system. Stable air pressure and normal discharge of materials.

Rotary valve working principle

• ‌The working principle of the rotary valve‌ is mainly based on its design structure and working mechanism. The rotary valves 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.
• The working principle of the rotary valves involves many aspects such as material filling, rotary conveying, air flow control, etc. Different types of rotary valves (such as self-cleaning rotary valves, eccentric rotary valves) have different implementation methods, but they are all designed to improve the quality of materials. Conveying efficiency and system stability.

Rotary valve diagram

What is the function of a rotary control valve?

• The main functions of the rotary valve include unloading and air locking. ‌‌
• The rotary valve plays an important role in the negative pressure pneumatic conveying system, and its main functions can be summarized as two points: unloading and air locking. The discharge performance is directly related to the air locking performance of the rotary valve, which is particularly important in negative pressure pneumatic conveying systems.
• The rotary valve is usually installed below the cyclone separator, dust collector or cyclone dust collector and is used as an unloader to ensure the smooth operation of the system and the effective transportation of materials. In addition, the rotary valve also has functions such as cut-off, diversion, pressure stabilization, and flow diversion, which further expands its diversity and flexibility in industrial applications.

• 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 turntable to rotate.
• The material is pushed and frictioned by the spiral scraper or centrifugal force, and is continuously transported upward or thrown away along the movement direction of the spiral scraper or turntable.
• From the turntable, it is finally discharged from the discharge port or falls freely in the air to realize the transportation and diffusion of materials. ‌‌

Rotary feeder diagram

What is the purpose of a rotary feeder?

• The main uses of rotary feeders include the following aspects:
• ‌Mining, building materials, chemical industry, metallurgy and other industries‌: In these industries, rotary feeders are used to continuously transport granular, powdery and block materials to ensure the stable operation of the production line‌.
• ‌Dust removal system‌: Rotary feeder is often used as an important part of the dust removal system, especially suitable for conveying dust and small particle materials‌.
• ‌Electronic industry, machinery industry and pharmaceutical industry‌: In these industries, rotary feeders are used for material supply in manufacturing and assembly processes, such as the production of electronic components, mechanical equipment and medical equipment.

Pneumatic conveying of solids

• Solids conveying is a chemical unit operation that is important in chemical production. In chemical production, many kinds of raw materials, semi-finished products and finished products are in a solid state and need to be transported from one place to another.
• The transportation of solid materials must ensure efficiency and maintain the quality of the materials. In the solid conveying area, under the action of the rotating screw, the solid polymer material added from the hopper is transported and compacted forward through the friction between the inner wall of the barrel and the surface of the screw.
• In the solid conveying area, due to the lower temperature, the material still remains in a solid state and is gradually solidified.
• At the same time, the gas mixed in the loose material is eliminated.

pneumatic conveying of solids

Pneumatic conveyor working principle

• The working principle of the pneumatic conveyor is to use the energy of air flow to transport granular materials in the direction of air flow in a closed pipe. ‌
• This process is a specific application of fluidization technology, which uses pressurized air as the transport medium to transport materials from one place to another.
• ‌Basic Principle‌: Pneumatic conveyors use the energy of air flow to transport granular materials from one place to another through closed pipes.
• This conveying method can be carried out in horizontal, vertical or inclined directions, and during the conveying process, physical operations such as heating, cooling, drying and air flow classification of materials or certain chemical operations can be performed simultaneously.
• ‌System composition‌: Pneumatic conveying system usually consists of feeder, conveying pipeline, separator and ‌material warehouse.
• The feeder is responsible for feeding materials into the conveying pipeline, which is the main channel for material transmission.
• The separator is used to separate the transported gas and materials, and the material warehouse is the storage location of the materials.

pneumatic conveying of solids

Dilute phase pneumatic conveying system calculation

• ‌The calculation of dilute phase pneumatic conveying system mainly involves the determination of parameters such as gas flow rate, pipe diameter, conveying speed and pressure drop. ‌
• Gas flow calculation
• ‌Definition‌: Gas flow refers to the flow of gas through the pipeline system, in cubic meters/hour.
• ‌Key parameters‌: Q (gas flow rate), A (cross-sectional area), V (gas flow rate), Y (transport rate).
• ‌Explanation‌: The calculation of gas flow rate is the basis for the design of dilute-phase pneumatic conveying system and directly affects the conveying efficiency and cost‌.
• Pipe diameter calculation
• ‌Definition‌: Pipe diameter refers to the inner diameter of the delivery pipe, in millimeters.
• ‌Key parameters‌: D (pipe diameter), Q (gas flow rate), V (gas flow rate).
• ‌Note‌: The selection of pipe diameter requires comprehensive consideration of gas flow, transportation distance and speed, as well as cost factors‌.
• Conveying speed calculation
• ‌Definition‌: Conveying speed refers to the average speed of materials in dilute phase pneumatic conveying, in meters per second.
• ‌Key parameters‌: V (conveying speed), Q (gas flow rate), A (cross-sectional area), Y (conveying rate), ρ (material density).
• ‌Note‌: The calculation of the conveying speed needs to consider the physical properties of the material and the gas flow rate, which has an important impact on the conveying efficiency and stability.
• Pressure drop calculation
• ‌Definition‌: Pressure drop refers to the pressure drop caused by frictional resistance, pipeline bending and other factors in the gas transportation pipeline.
• ‌Key parameters‌: ΔP (pressure drop), f (friction coefficient), L (pipe length), D (pipe diameter), Q (gas flow rate), A (cross-sectional area).
• ‌Note‌: The calculation of pressure drop is crucial for evaluating the energy consumption and efficiency of the conveying system, and the comprehensive impact of multiple factors needs to be considered‌.

pneumatic conveying of solids

What are the different modes of pneumatic conveying?

• ‌There are four main modes of pneumatic conveying: suction type, pressure type, mixed type and flow type. ‌
• ‌Suction pneumatic conveying‌: This mode uses air flow with a pressure lower than atmospheric pressure to convey materials. Its advantages include a simple feeder, the ability to convey from multiple places to one place, and the ability to convey from low and narrow places. However, the conveying distance and conveying volume of suction pneumatic conveying are limited, the sealing performance is required to be high, and the conveyed air needs to be processed before it can enter the fan and be exhausted.
• ‌Pressure-feed pneumatic conveying‌: Contrary to suction conveying, pressure-feed pneumatic conveying uses air flow with a pressure higher than atmospheric pressure to transport materials. Its main advantages include the ability to transport from one place to multiple places, long transport distance, high height, large transport capacity and high efficiency. However, pressure-feed pneumatic conveying consumes a lot of power, has high sealing requirements, and has a complex feeder structure.
• ‌Hybrid pneumatic conveying‌: This mode combines the characteristics of suction and pressure conveying. It can not only suck materials from multiple places, but also transport materials to multiple places, and the conveying distance is long. However, the hybrid pneumatic conveying device is more complex, and the passage of material-containing gas through the fan will accelerate the wear of the fan.
• ‌Flow pneumatic conveying‌: This is a modified form of pneumatic conveying. The material exhibits fluid-like properties during the conveying process. Its advantages include good maneuverability, high speed and stability, good continuity, and efficient containerization. Streaming pneumatic conveying is suitable for conveying large quantities of materials.

Pneumatic conveying pump

Pneumatic conveying pump is an emerging science and technology that uses pressurized pipe flow to convey powdery and granular objects. Because it has high productivity, simple structure, can be raised and lowered, and is easy to operate, it can be transported over long distances regardless of weather and location. During the transportation process, process operations such as converging, diverting, mixing, crushing, grading, drying, cooling and dust removal, and chemical reactions can be performed. The closed process not only ensures that the items are not damp, stained, or mixed with foreign matter, but also meets the requirements of environmental protection.

Vacuum pump for pneumatic conveying

• A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physical chemical methods to evacuate the pumped container to obtain a vacuum. Generally speaking, a vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in a closed space.
• According to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types, namely gas collection pumps and gas transfer pumps. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries.

What is pneumatic conveying ？

• Pneumatic conveying is a technology that uses airflow to transport materials through pipes‌. It uses compressed air to push bulk materials to move in the direction of air flow in the pipeline to realize material transportation. The pneumatic conveying device has a simple structure and is easy to operate. It can convey materials horizontally, vertically or inclined, and can simultaneously perform operations such as heating, cooling, drying and air flow classification during the conveying process.
• The working principle of pneumatic conveying is to use the kinetic energy of the air flow to make the bulk materials move along the pipeline with the air flow in a suspended state. According to the direction and pressure of the air flow, pneumatic conveying can be divided into suction type, pressure feeding type and mixed type. The suction type uses an exhaust fan to create a vacuum, so that the material is sucked into the pipeline; the pressure type uses a blower to press air into the pipeline, and the material is transported along with the air flow; the hybrid type is a combination of the above two methods.
• Pneumatic conveying has a wide range of applications, including foundry, chemical industry, metallurgy, building materials, grain processing and storage, shipbuilding, machine manufacturing and transportation. Due to its high efficiency, small footprint, economical and environmentally friendly characteristics, pneumatic conveying has become an indispensable technology in many industrial fields.
• The advantages of pneumatic conveying include high efficiency, small footprint, economical and environmentally friendly. It can continuously convey loose materials, and the process is closed and is not affected by climate and environment. In addition, pneumatic conveying can also perform multiple process operations at the same time, such as crushing, drying, grading, etc., to improve production efficiency and reduce worker labor intensity.

How does pneumatic conveying system work ?

• The working principle of the pneumatic conveying system is to use the flow kinetic energy generated by the high-speed flowing air in the conveying pipeline to suspend the particles, and then transport the granules from one place to another under the promotion of the kinetic energy of the air flow.
• The pneumatic conveying system mainly consists of the following parts:
• ‌Feeder‌: Responsible for adding materials to the conveying pipeline.
• ‌Conveyor pipe‌: Connects various components to realize material transportation.
• ‌Separator‌: Separates materials from the air flow.
• ‌Air Dust Collector‌: Removes dust in the airflow to ensure clean airflow.
• ‌Fan or vacuum pump‌: Provides power to make air flow in the pipe‌.
• Pneumatic conveying systems can be divided into several types according to the conveying method:
• ‌Pressure feeding type‌ (positive pressure transportation): The gas pressure is higher than atmospheric pressure, suitable for long-distance transportation.
• ‌Suction type‌ (negative pressure transportation): The gas pressure is lower than atmospheric pressure, suitable for short-distance transportation.
• ‌Hybrid type‌: Combining the advantages of positive pressure and negative pressure transportation, it is suitable for complex working conditions.
• ‌Flow conveying‌: A variant of material suspension conveying, suitable for specific materials‌.

Types of pneumatic pumps

• ‌Pneumatic pumps are mainly divided into the following categories: pneumatic gas pumps, pneumatic diaphragm pumps and pneumatic micro pumps. ‌
• Pneumatic gas pump‌:
• Pneumatic gas pumps are mainly used for high-pressure gas boosting and can produce high-pressure gas up to 90Mpa. It can pressurize most gases such as hydrogen, air, nitrogen, and natural gas.
• The characteristics of this pump include the ability to pressurize most gases, including corrosive gases (the internal core is made of stainless steel), a large pressure test range, low operating sound, no need for any power supply, and is suitable for flammable and explosive gases.
• Pneumatic diaphragm pump‌:
• The pneumatic diaphragm pump is a new type of conveying machinery that uses compressed air as the power source and is suitable for various corrosive liquids, liquids with particles, high viscosity, volatile, flammable, and highly toxic liquids.
• This kind of pump is made of a variety of materials, such as aluminum alloy, stainless steel, polypropylene, PVDF, etc., and uses different rubber or plastic materials according to different liquid media to meet the needs of different users.
• Pneumatic micro pump‌:
• Pneumatic micropumps are small in size, light in weight, and easy to carry. They are suitable for occasions that require smaller gas flow or space restrictions.

Pneumatic conveying pump diagram

Pneumatic conveying pump 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.

Pneumatic conveying system working principle

• The working principle of the pneumatic conveying system is to use the flow kinetic energy generated by high-speed flowing air to suspend particles, and then transport the granules from one place to another under the push of the air flow.
• Specifically, the pneumatic conveying system uses compressed air or other gases as the conveying medium to form a gas-solid two-phase flow in a closed pipeline, so that the material moves in the pipeline along the direction of the air flow.
• This conveying method can be used for horizontal, vertical or inclined conveying, and can simultaneously perform heating, cooling, drying and other operations of materials during the conveying process.

Types of pneumatic conveying system

• Pneumatic conveying systems can be divided according to different classification standards, mainly including the following types:
• ‌Divided by conveying pressure‌: positive pressure, negative pressure, combined positive and negative pressure systems.
• ‌Divided by transportation form‌: ‌Dilute phase, dense phase, semi-dense phase and other systems.
• ‌Divided by type‌: ‌suction type, ‌pressure type, ‌mixing type and ‌circulation type.
• According to the air flow speed in the conveying pipeline, it is divided into: suspended flow and plug flow.
• ‌Divided by sending device‌: ‌mechanical type and ‌barrel pressure type.
• ‌Divided according to the configuration of the transportation pipe: single pipe transportation and ‌double pipe transportation.
• ‌Divided according to the gas source supply method: continuous gas supply and pulse gas supply.

Pneumatic conveying system diagram

Pneumatic conveying system manufacturer

• 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.

How does pneumatic conveying work?

• The working principle of pneumatic conveying is to use the flow kinetic energy generated by high-speed flowing air to suspend particles, and then transport the granules from one place to another under the push of the air flow. Pneumatic conveying can be divided into two forms: dilute phase conveying and dense phase conveying.
• In dilute phase transportation, the solid content is lower than 1-10kg/m³, the operating gas speed is high (about 18~30m/s), and the transportation distance is generally within 300m. Mature equipment such as material seal pumps are simple to operate, have no mechanical rotating parts, have low delivery pressure and are maintenance-free‌1. In dense phase transportation, when the solid content is 10-30kg/m³ or the solid-to-gas ratio is greater than 25, the operating air speed is low, and higher air pressure is used for conveying. The conveying distance can reach more than 500m, but the equipment has many valves and the conveying pressure is high. , all pipes must be made of wear-resistant materials.
• Pneumatic conveyor is a device that uses gas flow to drive materials for transportation. It can be divided into two forms: pressure transportation and vacuum transportation. Pressure conveying is to compress air or other gases into high-pressure gas through equipment such as compressors, and then transport it through pipelines to the materials that need to be transported. The materials will flow along the pipelines with the air flow and be transported to the target location. Vacuum conveying is a process in which negative pressure is established in the conveying pipeline to form a vacuum environment, and the material is extracted from one point to another by adsorbing or grabbing it.