月度归档：10 月 2024

LGR rotary feeder

• The rotary feeder is also called a rotary valve, a new type of feeder, and an air lock. The usual rotary feeder structure 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.
• For the pressure-feeding and suction-feeding pneumatic conveying systems, the rotary feeder is one of the main components. It can feed the clinker pipe evenly and continuously. In the separation and dust collection part of the system, it It also has the functions of unloader and air lock.
• Rotary feeder, commonly known as blower, unloader, rotary feeding valve, rotary unloading valve, rotary valve, etc., is the main equipment for conveying bulk materials. It is widely used in grain processing due to its strong reliability and affordable price. , chemical raw materials, plastic metallurgy, energy mining, building materials, cement, docks and other industries.
• The brewery malt workshop and brewing workshop use rotary feeders to transport barley and malt. The rotary feeder mainly consists of the main valve (casing, end cover, impeller, sealing structure, etc.), motor reducer, protective device (sprocket, sprocket rotary feeder accessories) - air extraction chamber - acceleration chamber - anti- Card feeder.

LGR rotary feeder

• The upper and lower flanges of the LGR standard rotary feeder are both circular and provide special interfaces required by users. For example, square and rectangular flange connections can be determined separately, and the flange thickness is specified according to company standards.

Pumping room

• For materials with low density, especially powders, the purpose of adding an air extraction chamber to the rotary feeder is to ensure that the materials fall normally and the gas is discharged without affecting normal transportation.

LGR acceleration chamber

• When the acceleration chamber acts on the lower opening of the rotary feeder to feed powder and granular materials into the feeding pipe, it has the effect of accelerating the transportation without causing large pressure losses.

Calculation method of conveying capacity of rotary feeder

• W(m3H)=V(L/rev)xN(rpm)x60xn(%)/1000
• W:Discharge capacity(m3/H)
• V:Rotor volume(L/rev)
• N:Volumetric efficiency of the rotor(%)

Feeder selection

• 1.Performance of conveyed materials: name, particle size, accumulation temperature, temperature, angle of repose, moisture content.
• 2.Conveying capacity: Conveying volume per hour T/H or m3/h.
• 3.Installation method: formal or side mounting.
• 4.Whether it is necessary to equip an acceleration chamber and an air extraction chamber.
• 5.Do the inner chamber and blades of the rotary feeder require special treatment
• 6.Whether the reducer motor specifications are explosion-proof (indicate the level of protection)

Working principle

• Materials are added from the hopper and enter the high-pressure feeder under the control of the feeding valve for quantitative feeding. Roots blower or air compressor is used as the air source to generate high-pressure gas and transport the materials from the pipeline to the end point at a certain speed. Separator (silo), after the material gas is separated, the gas is filtered and dusted before being discharged into the atmosphere.

Stainless Steel Roots Blower

• Advantages of stainless steel roots blower
• Based on the introduction of Japanese SR series and R series fans, the company developed a compressor based on years of successful design and processing experience based on the successful experience and problems in the MVR project. Its characteristics are specifically reflected in the following aspects:

Stainless Steel Roots Blower

Corrosion problem

• For the common corrosion problems of steam fans, anti-corrosion of the flow-passing parts of the fans
• SUS304, SUS316L, and 2205 dual-phase steel are available. SUS304 is used in working conditions with a small temperature rise; 2205 stainless steel is used in high temperature and harsh working conditions due to its small thermal expansion coefficient and good corrosion resistance. 2205 fans are the perfect choice for long-term safe and efficient operation.
• Cast iron with Ni-P coating or Teflon coating can be used. The advantage is that the thermal expansion coefficient of cast iron is much lower than that of stainless steel, which can effectively prevent the rotor from seizing during rotation.
• Roots blower is a volumetric rotary blower. Each concave curved surface part on the rotor and the inner wall of the cylinder form a working volume. During the rotation of the rotor, the gas is taken away from the suction port. When it moves to the vicinity of the exhaust port, it is connected to the exhaust port. At the moment of passage, due to the rotation of higher pressure air flow, the pressure in the working volume suddenly rises, causing the steam temperature to rise.
• The two rotors work alternately in sequence. The two rotors do not contact each other, and the gap between them is tightly controlled to achieve sealing, so the discharged gas is not contaminated by lubricating oil.
• The high-speed centrifugal compressor 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 it, changes the flow direction, and converts the kinetic energy into potential energy. The main feature of high-speed centrifugal compressors is the compact arrangement of the binary impeller and compressor and gearbox. The motor, gearbox and compressor are usually mounted on the same base. It has the characteristics of low noise and high efficiency. Since the linear speed of the outer end of the impeller is greater than 400m/s and it is highly stressed, it is generally made of chromium-nickel steel or titanium alloy.
• The centrifugal blower has the characteristics of low compression ratio and large flow rate. Like the centrifugal compressor, the gas enters the impeller inlet from the axial direction and flows out radially under the action of centrifugal force. The fan impeller and casing are of welded plate structure and require the use of reinforcing ribs. A gearbox is usually not required and the drive system can achieve the required impeller speed. Due to the low compression ratio, the temperature rise is usually 6-8°C, and two units are often used in series in MVR systems.

Sealed form

• Use multiple labyrinth seals, double shaft seals (the oil seal made of VITON prevents lubricating oil from the tank from entering the side/main box, and the seal made of fluorine rubber prevents steam from entering the tank), and can be flexibly matched according to needs such as air backflush seals and mechanical seals.
• The combination can ensure that the seal of the compressor can be effective and reliable for a long time under positive or negative pressure working conditions and in different media environments such as water vapor or alcohol vapor; under conditions with particularly high application environmental requirements, we will combine the working chamber and The structure of the labyrinth + PEPE piston ring seal between the side bodies has been changed to a dedicated steam seal, which no longer distinguishes between positive and negative pressure application environments. Please refer to the special sealing process documents for details.

Cavitation of stainless steel fans

• Causes of cavitation: In valves, throats and other parts of the fluid, when the streamline interval narrows sharply and the flow rate increases, and when the pressure drops below the saturated vapor pressure of the fluid, the fluid boils and the fluid in the fluid Excess air separates, creating bubbles. When these bubbles generated in low-lying parts move like high-pressure parts, they are squeezed by the surrounding pressure, and the phenomenon in which their volume decreases and even ruptures is called cavitation. When cavitation occurs, a strong shock wave will be generated when the bubbles burst under the pressure of the surrounding pressure. When the pressure is relatively high, the impact energy will damage the metal surface.
• Prevention of cavitation
  As a measure to prevent cavitation
  (1) Control the circumferential speed of the rotor to be 30m/s or less below the current circumferential speed where cavitation does not occur.
  (2) Use 2205 dual-phase steel with good cavitation resistance.
  (3) Add appropriate amount of spray water to the inlet of the Roots blower to control the outlet temperature.

LGSR-S two-stage Roots blower

Introduction to two-stage Roots blower:

• The two-stage Roots blower produced by our factory is composed of two LGSR series standard Roots blowers connected in series.
• When the gas enters the first-stage fan to increase the pressure, it passes through the intercooler to reduce the gas temperature to below 40°C and then enters the second-stage fan to continue to increase the pressure.
• The maximum pressure increase of the unit can reach 200kPa. The main engine of the two-stage fan is driven by the same fan through a belt drive or a two-shaft extension motor.

Features:

• The two-stage three-blade Roots blower has high volumetric efficiency, large air supply, stable operation, reliable use, and relatively stable working characteristics.
• The impeller and shaft are integral structures and the impeller has no wear. The fan performance remains unchanged and can operate continuously for a long time.
• Forced gas transmission, the flow rate changes little with pressure, the outlet pressure is determined by the back pressure, and the transported gas is not contaminated by oil.
• The selection of bearings is relatively reasonable, and the service life of each bearing is uniform. The oil seal of the fan is made of imported fluorine rubber material, which is resistant to high temperatures and wear, so the fan has a long service life and high reliability.
• The fan has a large volume utilization rate, high volumetric efficiency, simple and compact structure, and flexible installation methods. Easy to use and maintain.
• Due to the adoption of a three-bladed rotor structure and a reasonable air inlet and outlet structure in the housing, the fan has small vibration and low noise.
• Pressure and temperature control provide unit operation protection.
• The fan oil seal is made of imported fluorine rubber material, which is high temperature resistant, wear-resistant and has a long service life.
• The complete range of models can meet the needs of different users for different purposes.

LGSR-S two-stage Roots blower specifications

LGSR roots vacuum pump

• caliber：Φ50mm-Φ350mm
• flow：0.5m³/min-223m³/min
• pressure range：atmospheric pressure-73.5kpa

Roots vacuum pump working principle

• The working principle of Roots vacuum pump is based on the synchronous and counter-rotation of its internal blade-shaped rotor. ‌
• The Roots vacuum pump is equipped with two blade-shaped rotors that rotate synchronously in opposite directions.
• There are small gaps between the rotors and between the rotors and the inner wall of the pump casing without contact with each other.
• This design allows Roots pumps to achieve efficient gas extraction at high speeds. Through the pushing effect of the rotor, the gas is sucked in and moved to the exhaust port, thereby achieving air extraction.
• Roots pumps usually do not have internal compression function, so the compression ratio is low. For applications with high and medium vacuum degrees, they usually need to be used with a backing pump.

LGSR roots vacuum pump

Roots vacuum pump structural features

• The main feature of Roots vacuum pump lies in its unique structure and working principle. Its structure includes two leaf-shaped rotors that rotate synchronously in opposite directions.
• There are small gaps between the rotors and between the rotors and the inner wall of the pump casing without contact with each other.
• This design allows Roots pumps to achieve efficient gas extraction at high speeds.
• Roots pumps have a wide speed range, usually between 500 and 3000 rpm. The specific speed selection depends on the specific application requirements.

Roots vacuum pump application areas

• Roots vacuum pumps are widely used in petroleum, chemicals, plastics, pesticides and other industrial fields.
• Due to its characteristics of fast start-up, low power consumption, and low operation and maintenance costs, Roots vacuum pumps have been tested for long-term operation in petroleum, chemical, metallurgy, textile and other industries, and have been vigorously promoted and applied in China.

Roots vacuum pump specifications

Lgsr roots vacuum pump manual

• Things to note when using Roots vacuum pump:
• 1.Usage environment: Please ensure that the Roots vacuum pump is installed in a dry, ventilated and dust-free environment, avoiding direct sunlight and high temperature.
• 2.Power supply requirements: Please check whether the power supply meets the requirements of the pump before use, and make sure it is well grounded to prevent electric shock.
• 3.Operating specifications: During operation, please follow the steps in the operation manual to avoid damage or safety accidents caused by improper operation.
• Routine maintenance of Roots vacuum pump:
• 1.Clean the pump body and exhaust pipe regularly to keep the interior clean and free of debris.
• 2.Regularly check the power cord and grounding conditions to ensure safety and reliability.
• 3.If any abnormality or failure is found, please stop the machine in time and contact professionals for repair.
• Roots vacuum pump troubleshooting:
• 1.Pump body heats up: It may be that the motor is overloaded or the heat dissipation is poor. It is recommended to check the power supply voltage and ventilation conditions.
• 2.The air pumping rate decreases: It may be due to rotor wear or air leakage in the air pumping pipe. It is recommended to check the rotor wear and repair the air leakage point.
• 3.Increased noise: It may be that the rotor is unbalanced or the bearings are worn. It is recommended to check the status of the bearings and make necessary replacements.
• Roots vacuum pump safety warning:
• 1.Disassembly and repair by non-professionals is prohibited: Disassembly by non-professionals may cause damage to the pump body or safety accidents.
• 2.It is prohibited to use in flammable and explosive environments: Roots vacuum pumps should be kept away from flammable and explosive items to prevent danger.
• 3.It is prohibited to touch rotating parts when the pump is running: When the pump is running, rotating parts may cause injury, so please keep a safe distance.
• Roots vacuum pump maintenance recommendations:
• 1.It is recommended to conduct an excellent inspection of the Roots vacuum pump every three months to ensure that all components are in good condition.
• 2.It is recommended to perform professional maintenance on the pump body at least once a year to extend the service life and improve performance.
• Points to note during the operation of Roots vacuum pump:
• 1.The Roots vacuum pump must be used in accordance with the technical specifications during operation. Under normal circumstances, the inlet pressure of the Roots vacuum pump is below 1330Pa, and the maximum pressure difference of the pump shall not be higher than its maximum allowable pressure difference.
• 2.Pay attention to the motor load and the temperature rise of various parts of the pump. Under normal operation, the maximum temperature rise of the pump shall not exceed 40°C, and the maximum temperature shall not exceed 80°C. If a water ring pump is selected as the backing pump, sometimes the temperature rise of the Roots pump may increase due to the relatively large pumping speed ratio of the two pumps, but the maximum temperature of the pump shall not exceed 100°C.
• 3.There should be no irregular abnormal vibration and abnormal noise during operation.
• 4.If it is found that the motor is overloaded, the temperature rises too high, the sound is abnormal, the vibration is large, etc. during operation, the machine should be stopped immediately to check the cause and eliminate the fault.

LGSR-ROOTS BLOWER

• caliber：Φ50-Φ350mm
• flow：0.5-226m³/min
• pressure range：9.8kpa-98kpa

Roots blower diagram

Roots blower features

• The double-stage three-blade Roots blower has high volumetric efficiency, large air supply, stable operation, reliable use, and relatively stable working characteristics.
• The impeller and shaft are integral structures and the impeller has no wear. The fan performance remains unchanged and can operate continuously for a long time.
• Forced gas transmission, the flow rate changes little with pressure, the outlet pressure is determined by the back pressure, and the transported gas is not contaminated by oil.
• The selection of bearings is relatively reasonable, and the service life of each bearing is uniform. The oil seal of the fan is made of imported rubber material, which is resistant to high temperatures and wear, so the fan has a long service life and high reliability.
• The fan has a large volume utilization rate, high volumetric efficiency, simple and compact structure, and flexible installation methods. Easy to use and maintain. Due to the adoption of a three-blade rotor structure and a reasonable air inlet and outlet structure in the housing, the fan has small vibration and low noise.
• Pressure and temperature control provide unit operation protection.
• The fan oil seal is made of imported fluorine rubber material, which is high temperature resistant, wear-resistant and has a long service life.
• The complete range of models can meet the needs of different users for different purposes.

LGSR-ROOTS BLOWER

Roots blower specifications