definition

A high viscosity rotary pump, also known as a cam rotary pump, is a cam type volumetric pump that uses the periodic conversion of multiple fixed volume conveying units in the working chamber to transport fluids. It is mainly used to transport fluids. High viscosity rotary pumps can be used in various industries, such as the food industry, daily chemical industry, pharmaceutical industry, construction industry, and so on.

Working principle

The high viscosity rotary pump has an internal toothed drive gear (outer rotor) that drives the inner rotor to rotate in the same direction inside the fully enclosed pump body. The crescent plate on the pump body and front cover separates the suction and discharge ports.

When rotating, negative pressure is formed at the suction port, and the liquid is sucked in. The rotor carries the liquid to the discharge port, and the pump body is discharged under pressure, completing the transportation of the liquid.

characteristic

High viscosity rotary pumps have a wide range of viscosity adaptability, and are characterized by low speed, high efficiency, smooth operation, strong self-priming ability, easy operation, and pump preheating. This pump adopts advanced sealing, reliable performance, and long service life. It is equipment for transporting high temperature, high viscosity, or high hygiene requirements in the petrochemical, oil, asphalt, food, and light industry industries.

The viscosity range of materials transported by high viscosity rotary pumps is relatively wide, ranging from tens to hundreds of thousands of Lis. The material configuration of high viscosity pumps varies under different viscosity and working conditions.

Characteristics of different types of high viscosity rotary pumps

The materials selected for high viscosity rotary pumps can be divided into stainless steel, ordinary cast iron, ball milled cast iron, copper, and cast steel according to different working conditions.

1. The high viscosity rotary pump made of cast iron material has good cost-effectiveness after heat treatment of the rotor and shaft, and can be used for various conveying and boosting without special requirements.

2. The high viscosity rotor pump made of ductile iron material has good wear and temperature resistance characteristics, mainly used for conveying media with severe wear. Its rotor is carburized to have good wear and temperature resistance, and the cost is not high.

3. The high viscosity rotary pump made of cast steel material is also widely used in applications that require insulation, such as conveying room temperature solidification crystallization media such as asphalt and resin, depending on the material characteristics.

4. Copper made high viscosity rotary pumps are often used in working conditions with explosion-proof requirements.

5. High viscosity rotor pumps made of stainless steel are used in corrosive and hygienic environments. The materials can be divided into 304 and 316. 316 material is slightly more expensive and has stronger corrosion resistance. If the corrosiveness is not very strong, it is recommended to choose 304 material.

advantages and disadvantages

Advantages of high viscosity rotary pump

1. Smooth liquid transportation, no pulsation, low vibration, and low noise.

2. Has strong self-priming performance.

3. Proper selection of component materials can transport various corrosive media and can be used at temperatures up to 200 ℃.

4. The inner and outer rotors have the same direction of rotation, with minimal wear and a long service life.

5. The speed of the pump is linearly related to the flow rate, and the speed can be adjusted appropriately to change the flow rate of the pump.

6. Especially suitable for transporting high viscosity and thick media.

Disadvantages of high viscosity rotary pumps

1. Not suitable for workstations with a pressure exceeding 2.5Mpa, and not suitable for conveying sludge with a solid content of ≥ 20%.

2. The price is higher compared to other types of pumps (centrifugal pump, screw pump, diaphragm pump).

Usage

1、 The usage method of high viscosity rotary pump

1. The high viscosity rotary pump is equipped with a mechanical seal device for cooling water. Before starting, the cooling water should be turned on first, and then the oil pump should be ignited to turn on the pump. Regularly investigate whether the cooling water is normal and prohibit operation without cooling water.

2. In principle, high viscosity rotary pumps can only operate under conditions such as pressure, flow rate, viscosity, temperature, pH value, and solid content., And try to prevent operation under conditions that exceed the constraints as much as possible.

3. Before transporting solidified high viscosity media, the medium inside the pump should be diluted to prevent the high viscosity medium from remaining in the pump and solidifying. If necessary, please use cleaning solution to circulate and clean for 5-10 minutes through the pump.

4. During the operation of high viscosity rotary pumps, the increase in material viscosity, flow rate, and pressure can cause motor overload. It is necessary to regularly check whether the pressure gauge, safety valve, and overcurrent protection equipment are normal.

5. High viscosity rotary pumps should have their filters and screens cleaned monthly within one year of installation to prevent blockages that may cause the pump to malfunction. Try to avoid using Y-shaped pipeline filters as much as possible (the effective area of Y-shaped pipeline filters is too small, which affects the flow rate of the feed medium and causes pump oscillation).

6. The high viscosity rotary pump is equipped with insulation equipment. Before starting, it should be preheated with hot water (steam) and started after the pump temperature rises to the transportation technical requirements. Turn off hot water (steam) before shutting down.

Product characteristics

1. All parts in contact with the medium (material) are made of high-quality stainless steel (materials SUS304, AISI316, 316L) that fully comply with hygiene standards.

2. Suitable for conveying media (materials) with high viscosity, concentration, and any particle content.

3. Suitable for temperatures ranging from -30 to+200 degrees Celsius.

4. High pressure, suitable for long-distance and high resistance quantitative transportation.

5. The speed is low, usually between 200 rpm and 600 rpm, and the material conveyed by it maintains its original quality without any physical or chemical reactions.

6. There is no contact between rotors, and there is no wear and tear even after long-term use. The operation is smooth, the noise is low, and the efficiency is high.

7. The design is innovative, the installation and maintenance are simple and easy, and it is convenient for cleaning, ensuring the cleanliness of the machine's interior and production hygiene.