Peristaltic pump,syringe pump structure and working principle

Peristaltic pump

The peristaltic pump consists of three parts: the drive, the pump head and the hose. The fluid is isolated in the pump tubing, which can quickly replace the pump tubing, the fluid retrograde, the dry running, the maintenance cost is low, and so on constitute the main competitive advantage of the peristaltic pump.

working principle

The peristaltic pump resembles a finger-filled hose with a fluid-like hose that moves forward with the fingers sliding forward. The peristaltic pump is also the principle that the wheel is replaced by a finger. The fluid is pumped by alternately pressing and releasing the elastic delivery hose of the pump. Just like with two fingers clamp the same hose, with the fingers of the movement, the formation of negative pressure inside the tube, the liquid flow.

The peristaltic pump is a pump tube that forms a "pillow" fluid between the two rollers. The volume of the "pillow" depends on the inner diameter of the pump tube and the geometrical characteristics of the rotor. The flow depends on the speed of the pump head and the size of the "pillow", and the number of "pillows" generated by each revolution of the rotor. The size of the "pillow" is generally constant (except when pumping particularly viscous fluids).

Compared with a pump with the same diameter as the rotor, a larger "pillow" volume of the pump is produced, and the volume of the fluid delivered by the rotor per revolution is also large, but the pulsation is also large. This is similar to the case of a membrane valve. And a smaller "pillow" volume of the pump, the rotor per revolution of the volume of fluid is also smaller; and fast, continuous formation of small "pillow" to make the fluid flow is more stable. This works like a gear pump.

Peristaltic pump, syringe pump superiority and application field

Superiority

1, no pollution: fluid only contact the pump tube, do not touch the pump;

2, high precision: repeat accuracy, high stability;

3, low shear force: is the ideal tool for conveying shear sensitive, aggressive and strong fluid;

4, good sealing: a good self-priming ability, can be idle, to prevent the return;

5, simple maintenance: no valves and seals;

6, with two-way equal flow capacity; no liquid air operation will not damage any parts of the pump; can produce up to 98% vacuum; no valves, mechanical seals and packing seals, there is no such leakage And the maintenance of factors; can easily transport solid, liquid or gas-liquid mixed phase fluid, allowing the fluid contained in the solid diameter of 40% of the diameter of the tubular components; can transport a variety of grinding, corrosion, oxygen sensitive properties of materials and various Food, etc .; only the hose for the need to replace the parts, the replacement operation is extremely simple; in addition to the hose, the delivery of products without contact with any parts.

Application areas

Chemical industry; mining, metallurgical industry; paper industry; paint coatings industry; food industry; ceramic industry; oil industry; water treatment industry; pharmaceutical industry; medical equipment industry;

Peristaltic pump, syringe pump classification

classification

The use of peristaltic pump is to get the required flow, so according to the operation and use of peristaltic pump, divided into:

1, speed type peristaltic pump: with the basic control function of the peristaltic pump, display speed, start and stop, direction, speed adjustment, filling emptying, power-down memory, external control input and other functions.

2, flow type peristaltic pump: In addition to the basic functions, the increase in flow display, traffic correction, communication and other functions.

3, the distribution of peristaltic pump: In addition to the basic control functions to increase the flow display, flow correction, communication, liquid distribution, suction, output control and other functions.

4, custom type (OEM) peristaltic pump: has a series of different flow range of peristaltic pump head, customers can according to their own needs, design different peristaltic pump drive circuit supporting the use of.

Peristaltic pump, syringe pump system components

System composition

The peristaltic pump system consists of three parts: a peristaltic pump driver, a peristaltic pump head, a peristaltic pump tubing.

Choose tube

As a condition for peristaltic pump hoses

Has a certain flexibility, that is, the hose can be quickly restored after the radial pressure shape

Has a certain wear resistance

Have a certain ability to withstand stress

No leakage (good air tightness)

Low adsorption, good temperature resistance, easy aging, no swelling, corrosion resistance, precipitation is low

Select the pump head

Select single, multi-channel delivery fluid

Whether it is easy to replace the hose

Whether it is easy to fix the hose

The pipe gap is fine-tuned by ratchet or other means to accommodate different wall thicknesses or to achieve fine-tuning of the pressure

Roller selection: 6 roller structure relative flow slightly larger; 10 wheel structure fluid pulsation amplitude smaller

Trigger structure is smart, open the card is convenient

Select the drive

Whether traffic control is required

Whether the need for liquid distribution

What is the size of the traffic range?

Whether the overall structure is reasonable, whether the operation is convenient

Flow accuracy, liquid volume accuracy is required

Special requirements: protection class, explosion-proof grade and so on

External control requirements: equipment support, operation, etc., such as RS232, RS458 communication, 0-5V external control speed, pulse speed, etc.

Peristaltic pump, daily maintenance of syringe pump

Maintenance

In the daily use of the process, the peristaltic pump, syringe pump after a long time to use as much as possible after the replacement of the hose, it is not easy to cause the silicone tube rupture, the liquid from the hose into the pump head into the wheel, accompanied by corrosive liquid into the wheel The gap should be promptly disassembled the pump head to avoid weathering after the solidification in the roller gap, will cause the pump head card main phenomenon. Hose in the course of the use of specific pumps according to the frequency of the use of timely replacement, or often move the location, if the liquid has a strong corrosive, please select the appropriate material of the imported hose, so as to avoid damage to the pump.