The working principle and characteristics of the lobe rotor pump

The working principle and characteristics of the lobe rotor pump

　　 Cam rotor pump, as a fluid conveying technology, is a non-contact, rotary positive displacement pump. It is mainly composed of circular arc pump casing, rotor, front and rear plates, mechanical seals and synchronous gearboxes and other accessories. Its working principle is the same as that of a Roots blower. The two rotors move relative to each other under the drive of two parallel shafts. A continuous sealed cavity is formed between the rotor and the pump casing, and the medium filled in the cavity is continuously rotated by the rotor. Push from the end to the outlet end to complete the conveying of the medium. The rotor is divided into two types: straight tooth type and spiral type. The number of blades is 2, 3, 4 and 6 blades. Under the pressure of the rotor pump, the flow rate and the speed are strictly linear. Rotor pumps are widely used in water treatment, chemical industry, shipbuilding, food, petroleum, biogas and other fields due to their large flow, small size, and good characteristics. Especially in recent years, many screw pumps have been gradually replaced by cam rotor pumps in various sludge conveying system processes in the water treatment field.
The performance of the cam rotor pump is very stable, and the dehydrator system is operating normally; and the feed pump motor is changed from 30kW to 22kW to meet the process requirements, so the energy consumption is also reduced; at the same time, the pump frequency is about 45Hz at the pump’s large flow point. The rated frequency of the pump design is reached, so the performance of the pump is relatively stable. Due to the relatively large wear of the pump in the relatively high-pressure stage, it is recommended that the time under high-pressure working conditions should not exceed 60min to achieve a longer service life.
When designing the inlet and outlet pipelines of the lobe rotor pump, especially for the working conditions with relatively high pressure, try to use straight pipes at the inlet and outlet of the lobe rotor pump to avoid elbows, so that the pipeline vibration is less and more reasonable. Add piping piers and buttresses at elbows, tees, etc. to strengthen the pipe support, and at the same time add flexible joints at appropriate locations to resonate. This is a problem that needs to be paid attention to when the cam rotor pump is used in relatively high pressure conditions.
Cam rotor pump manufacturers and suppliers

The multi-purpose and principle of self-priming pump

There are many types of centrifugal pumps, but there are so many different types of centrifugal pumps. How to choose a centrifugal pump that suits your needs? What kind of understanding should be done before choosing.

The following describes the multiple uses of self-priming pumps:
There are many structural types of self-priming pumps. Among them, the working principle of the external-mixing self-priming pump is that the pump casing is filled with water before the centrifugal pump is started (or there is water in the pump casing itself). After starting, the impeller rotates at a high speed to make the water in the impeller channel flow to the volute. At this time, the inlet forms a vacuum, so that the water inlet check door opens, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel. On the other hand, the water discharged into the gas-water separation chamber by the impeller flows back to the outer edge of the impeller through the left and right return holes. The water flowing back from the left return hole is ejected into the impeller channel under the action of pressure difference and gravity, and is crushed by the impeller, mixed with the air from the suction pipe, and thrown to the volute. The submersible pump is corrosion-resistant The pump acid-resistant pump, the fire pump moves in the direction of rotation. Then it merges with the water flowing from the right backwater hole and moves along the volute. Because the liquid continuously impacts the cascade in the volute and is constantly broken by the impeller, it is stirred and mixed strongly with the air, and the mixture of natural gas and water is energized, and the negative gas and water cannot be separated by continuous activity. The mixture is peeled off by the tongue at the exit of the volute and enters the separation chamber along the short tube. The air in the separation chamber is separated and discharged by the outlet pipe, while the water still flows to the outer edge of the impeller through the left and right return holes, and is mixed with the air in the suction pipe. Repeated cycles like this, gradually exhausting the air in the suction pipeline, allowing water to enter the pump, completing the self-priming process. Sewage pump self-priming pump oil pump

The working principle of the internal mixing self-priming pump is the same as that of the external mixing self-priming pump. The difference is that the return water does not flow to the outer edge of the impeller, but to the inlet of the impeller. When the internal-mixing self-priming pump is started, the return valve at the front and bottom of the impeller must be opened to make the liquid in the pump flow back to the inlet of the impeller. Under the action of the high-speed rolling of the impeller, the water mixes with the air from the suction pipe to form an air-water mixture and discharge to the separation chamber. Here air is discharged and water returns from the return valve to the impeller inlet. Repeat this until the air is exhausted and the water is sucked up.

The self-priming height of the self-priming pump is related to factors such as the front seal clearance of the impeller, the number of revolutions of the pump, and the liquid level of the separation chamber. The smaller the front seal clearance of the impeller, the greater the self-priming height, which is generally taken as 0.3~0.5 mm; when the clearance increases, the pump’s head and efficiency will decrease except for the decrease of the self-priming height. The self-priming height of the pump increases with the increase of the circumferential speed u2 of the impeller, but when the maximum self-priming height is reached, the number of revolutions increases and the self-priming height no longer increases. At this time, the self-priming time is only shortened; when the number of revolutions When descending, the self-priming height will follow. Under the condition that other premises remain unchanged, the self-priming height also increases with the increase of the water storage height (but it cannot exceed the optimal water storage height of the separation chamber). In order to better mix the negative air and water in the self-priming pump, the blades of the impeller must be smaller to increase the pitch of the cascade; and a semi-open impeller (or an impeller with a wider impeller channel) should be used, which is more convenient The backwater shoots deeply into the impeller cascade.

self-priming pump

Ten characteristics of corrosion-resistant horizontal self-priming pump

Ten characteristics of corrosion-resistant horizontal self-priming pump:

Corrosion-resistant horizontal self-priming pumps are generally used for pressurized water delivery in high-rise buildings, and can also transport sewage containing particle fibers. At the same time, it is also suitable for the discharge of severely polluted wastewater from factories and businesses, sewage discharge stations in residential areas, water distribution systems in urban sewage treatment plants, drainage stations for civil air defense systems, water supply equipment in water plants, sewage discharge in hospitals, hotels, municipal engineering construction sites, For industries such as auxiliary equipment for mines, rural biogas digesters, and farmland irrigation, the conveyor belt granular sewage and dirt can also be used for clean water and weakly corrosive media. Not much to say, I will immediately show you the ten characteristics of Saiken corrosion-resistant horizontal self-priming pump:

  1. The double-blade impeller structure is adopted, which greatly improves the passage capacity of dirt
  2. The mechanical seal adopts a new type of grinding pair, and it runs in the oil chamber for a long time;
  3. The overall structure is compact, small in size, low in noise, significant in energy saving, convenient for maintenance, and convenient for users to replace;
  4. The automatic control cabinet can automatically control the super-movement and stop of the pump according to the required liquid level change, without special supervision, and is extremely convenient to use;
  5. The installation method can be equipped according to the user’s needs, which greatly facilitates installation and maintenance, and people can enter the sump without this;
  6. It can be used within the design range, and the motor will not be overloaded;
  7. Adopting the design of large flow channel anti-clogging hydraulic components, which greatly improves the dirt passing capacity, and can effectively pass 5 times the diameter of the pump caliber and solid particles with a diameter of about 50% of the pump caliber.
  8. The pump design is reasonable, the matching motor is reasonable, the efficiency is high, and the energy saving effect is remarkable.
  9. The mechanical seal adopts double-end face series seal, and the material is hard corrosion-resistant tungsten carbide, which has the characteristics of durability and wear resistance, which can make the pump run safely and continuously;
  10. Compact structure, small size, easy to move, easy to install, no need to build a pump room, can work when submerged in the water, greatly reducing the project cost.
    Self-priming pump manufacturers and suppliers
Plastic self-priming pump

How to improve the self-priming ability of corrosion-resistant self-priming pumps-Saiken Pump Industry

When we bought a self-priming pump, one thing we valued is its self-priming ability. Seiken Pump will introduce how to improve the self-priming ability of the self-priming pump.

How to improve the self-priming ability of corrosion-resistant self-priming pump

  1. Install a bottom valve at the entrance of the corrosion-resistant self-priming pump: the bottom valve is actually a check valve, which can make the water flow only from the pool into the suction pipe without backflow, so there will always be water in the pump body. The self-priming force will not be affected.
  2. The corrosion-resistant self-priming pump reduces the bends, drop height and horizontal distance of the inlet pipe.
  3. Install a vacuum pump on the suction pipe of the water pump. Before the water pump is started, the vacuum pump is started first, so that the water suction pipe of the water pump is filled with water first to ensure that the water pump starts automatically and quickly. This type of water absorption requires a complete automatic control system to ensure normal operation.
  4. The gas-liquid separation acceleration device can be installed to accelerate the gas-liquid separation, that is, the self-priming time can be shortened. The simplest gas-liquid separation acceleration device is to add a baffle in the gas-liquid separation chamber.

Self-priming pump manufacturers and suppliers

PVDF Self-Priming Pump

AODD PUMP features


AODD PUMP features:

  1. Compressed air is the power.
  2. It is a positive displacement pump whose volume changes caused by the reciprocating deformation of the diaphragm. Its working principle is similar to that of a plunger pump. Due to the characteristics of the working principle of the diaphragm pump, the diaphragm pump has the following characteristics:
    (1) The pump will not overheat: compressed air is used for power, and it is a process of expansion and heat absorption when exhausting. The temperature of the pneumatic pump is reduced when it is working, and no harmful gas is discharged.
    (2) No electric sparks: The pneumatic diaphragm pump does not use electricity as power, and prevents static sparks after being grounded
    (3) Liquids containing particles can be passed: because the volumetric work and the inlet is a ball valve, it is not easy to be blocked.
    (4) The shearing force to the material is extremely low: how to suck in and out when working, so the agitation to the material is minimal, suitable for the transportation of unstable materials
    (5) The flow can be adjusted, and a throttle valve can be installed at the material outlet to adjust the flow.
    (6) It has the function of self-priming.
    (7) It can be run dry without danger.
    (8) Can dive for work.
    (9) The fluids that can be transported are extremely wide, ranging from low-viscosity to high-viscosity, and viscous from corrosive.
    (10) There is no complicated control system, no cables, fuses, etc.
    (11) Small size, light weight and easy to move.
    (12) There is no need for lubrication, so it is easy to maintain and will not pollute the working environment due to dripping.
    (13) The pump can always maintain high efficiency and will not be reduced due to wear.
    (14) 100% energy utilization. When the outlet is closed, the pump will automatically stop, and the equipment will move, wear, overload, and heat
    (15) There is no dynamic seal, easy maintenance to avoid leakage. No dead spots when working.
    AODD PUMP manufacturers and suppliers
Ex-factory price AODD PUMP

AODD PUMP application advantages

AODD PUMP application advantages:
The aerodynamic double diaphragm pump is a new type of conveying machinery that can convey various corrosive liquids, liquids with particles, high viscosity, volatile, flammable, and highly toxic liquids. The diaphragm pump has four materials: plastic AODD PUMP, aluminum alloy AODD PUMP, cast iron AODD PUMP, stainless steel AODD PUMP.
Diaphragm pumps use nitrile rubber, chloroprene rubber, fluorine rubber, polytetrafluoroethylene, and polytetrahexaethylene according to different liquid media. To meet the needs of different users. It is installed in various special occasions and used to pump the medium that cannot be pumped by conventional pumps, and has achieved satisfactory results.
Diaphragm pumps have an absolute dominant position in the painting and ceramic industries. The advantages of pneumatic diaphragm pumps are:

  1. Since air is used as power, the flow rate is automatically adjusted with the change of back pressure (outlet resistance), which is suitable for medium and high viscosity fluids. The working point of the centrifugal pump is set based on water. If it is used for a fluid with a higher viscosity, a reducer or frequency converter is required, which greatly increases the cost. The same is true for gear pumps.
  2. It is reliable and low-cost to use pneumatic pumps in flammable and explosive environments, such as the transportation of fuel, gunpowder, and explosives, because: first, it is impossible to generate sparks after grounding; second, there is no heat generation during work, and the machine does not It will overheat; third, the fluid will not overheat because the diaphragm pump has the least agitation to the fluid.
  3. In places with harsh construction sites, such as wastewater discharge from construction sites and industrial mines, due to the large amount of impurities and complex components in the sewage, the pipeline is easy to be blocked, which will cause excessive load on the electric pump, and the electric motor will be easily damaged due to heat. The pneumatic diaphragm pump can pass particles and has an adjustable flow rate. When the pipeline is blocked, it will automatically stop until it is unobstructed.
  4. It can be used to transport fluids with relatively unstable chemical properties, such as photosensitive materials, flocculants, etc. This is because the shear force of the diaphragm pump is low and the physical impact on the material is small.
  5. In the treatment of hazardous and corrosive materials, the diaphragm pump can completely isolate the materials from the outside world.
  6. Or ensure that no impurities contaminate raw materials in some tests.
    In addition, the diaphragm pump is small in size, easy to move, does not require a foundation, occupies a very small area, and is easy and economic to install. It can be used as a mobile material transfer pump.
    AODD PUMP manufacturers and suppliers
AODD PUMP

Precautions for using AODD PUMP

Precautions for using AODD PUMP:
Pneumatic diaphragm pump is a positive displacement pump that uses compressed air as its power to change the volume through the reciprocating deformation of the diaphragm. Its working principle is similar to that of a plunger pump.
Pay attention to the following points when using a pneumatic diaphragm pump to operate:

  1. Ensure that the largest particle contained in the fluid does not exceed the maximum safe passing particle diameter standard of the pump.
  2. The intake pressure should not exceed the maximum allowable working pressure of the pump. Compressed air higher than the rated pressure may cause personal injury and property loss and damage the performance of the pump.
  3. Ensure that the pump pressure piping system can withstand the highest output pressure reached, and ensure the cleanliness and normal working conditions of the driving air system.
  4. Electrostatic sparks may cause explosions, resulting in personal injury and death accidents and property losses. If necessary, use a wire with a large enough cross-sectional area to properly and reliably ground the ground screw on the pump.
  5. Grounding requirements comply with local laws and regulations and some special requirements on site.
  6. Tighten the pump and all connecting pipe joints to prevent electrostatic sparks from being generated due to vibration, impact and rubbing. Use antistatic hose.
  7. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms.
  8. Keep good exhaust and ventilation, away from flammable, explosive and heat sources.
    AODD PUMP manufacturers and suppliers
AODD PUMP manufacturers and suppliers

Precautions when using AODD PUMP

Precautions when using AODD PUMP:
Air double diaphragm pump is a positive displacement pump that uses compressed air as its power to change the volume through the reciprocating deformation of the diaphragm. Its working principle is similar to that of a plunger pump.
Pay attention to the following points when using a pneumatic diaphragm pump to operate:

  1. Ensure that the largest particle contained in the fluid does not exceed the maximum safe passing particle diameter standard of the pump.
  2. The intake pressure should not exceed the maximum allowable working pressure of the pump. Compressed air higher than the rated pressure may cause personal injury and property loss and damage the performance of the pump.
  3. Ensure that the pump pressure piping system can withstand the highest output pressure reached, and ensure the cleanliness and normal working conditions of the driving air system.
  4. Electrostatic sparks may cause explosions, resulting in personal injury and death accidents and property losses. If necessary, use a wire with a large enough cross-sectional area to properly and reliably ground the ground screw on the pump.
  5. Grounding requirements comply with local laws and regulations and some special requirements on site.
  6. Tighten the pump and all connecting pipe joints to prevent electrostatic sparks from being generated due to vibration, impact and rubbing. Use antistatic hose.
  7. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms.
  8. Keep good exhaust and ventilation, away from flammable, explosive and heat sources.
AODD PUMP

Media that AODD PUMP can transport

Media that AODD PUMP can transport:

  1. Pump peanut butter, kimchi, mashed potatoes, small red sausage, apple jam, chocolate, etc.
  2. Pump paint, gum, and pigment.
  3. Adhesives and glues, all types can be pumped.
  4. All kinds of tiles, porcelain, bricks and pottery glaze slurry.
  5. After the oil well is drilled, pump the sediment and grouting.
  6. Pump various emulsifiers and fillers.
  7. Pump all kinds of sewage.
  8. Pumps are used as tankers and barges are used to clear the warehouse and absorb the sewage in the warehouse.
  9. Hops and baking powder syrup, syrup, molasses.
  10. Pump water in mines, tunnels, tunnels, beneficiation and slag.
  11. Pump cement grouting and mortar, all kinds of rubber grout.
  12. Various abrasives, corrosives, oil and mud, cleaning grease and general containers.
  13. Various highly toxic, flammable and volatile liquids.
  14. Various strong acids, strong alkalis, and strong corrosive liquids.
  15. All kinds of high temperature liquids can withstand up to 150 degrees.
  16. As the front-stage pressure sending device of various solid-liquid separation equipment.
    AODD PUMP manufacturer and supplier from China
AODD PUMP

Today we will talk about AODD PUMP

Today we will talk about AODD PUMP:
The installation method of the diaphragm in the Air operated double diaphragm pump, which does not affect the volume change requirements of the pump, and makes full use of the excellent pressure resistance of the diaphragm. It is carried out on the geometrical size of the diaphragm. It does not need to increase the cost and workload, and it does not need to increase the cost and workload. It can greatly improve the service life of the diaphragm, ensure the normalization of production and improve the quality of product production. It can be applied to the installation of diaphragms in various diaphragm pumps.
The diaphragm pump equipment system consists of one or more double-sided pumps, such as a pneumatic double diaphragm pump. The manifold on the pump is separated, so that each side of the pump pumps one component of the multi-component material, and an accumulator is connected to the outputs on both sides, so that the out-of-phase output of the pump becomes the same phase. Diaphragm isolation valves can be used on each side of the pump to prevent the mixed material from flowing back. If a mixing ratio other than 1:1 is required, more than one such pump can be used together to achieve a variety of mixing ratios.
The diaphragm failure monitoring system is used to detect the leakage of the diaphragm of the diaphragm pump. The system includes a pump that has a working chamber with working fluid inside; a pumping chamber for pumping materials into and out of the pump; and a diaphragm to isolate the working chamber from the pumping chamber. A first optical fiber is connected with the working chamber to transmit an optical signal through the working fluid. A second optical fiber is connected to the working chamber to receive the optical signal transmitted by the first optical fiber. An electrical signal establishment device that establishes the first electrical signal when the optical signal is transmitted from the first optical fiber, passes through the uncontaminated working fluid and reaches the second optical fiber. This electrical signal establishing device establishes a second electrical signal when the optical signal is transmitted from the first optical fiber, passes through the contaminated working fluid and reaches the second optical fiber. When the second electrical signal is established, according to this, the leakage of contaminated material through the diaphragm into the working chamber can be detected.

AODD PUMP manufacturers and suppliers

AODD PUMP
https://www.saikenpumps.co