Industry news

Self-suction pump structure and common types

2021-08-13
The self-priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming ability. There is no need to install a bottom valve in the pipeline, and you only need to ensure that the pump body has a quantitative priming liquid before work. Different liquids can use self-priming pumps of different materials.
The working principle of the self-priming pump is to fill the pump casing with water before starting the pump (or there is water in the pump casing itself). After starting, the impeller rotates at 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.

There are many structural types of self-priming pumps, among which molten salt pumps, vacuum pumps, submersible pumps, metering pumps, gear pumps, corrosion-resistant pumps, acid-resistant pumps, and fire pumps flow in the direction of rotation. Then it merges with the water flowing from the right return hole and flows along the volute. Because the liquid continuously impacts the cascade in the volute and is continuously broken by the impeller, it is stirred and mixed strongly with the air to form a gas-water mixture, and it flows continuously so that the gas and water cannot be separated. 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 room 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. Repeatedly circulate in this way, gradually exhaust the air in the suction pipeline, make water enter the pump, and complete the self-priming process. The sewage pump self-priming pump oil pump diaphragm pump screw pump gear oil pump pump is the same, the difference is that the return water does not flow to the outer edge of the impeller, but to the impeller inlet. 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 rotation of the impeller, the water mixes with the air from the suction pipe to form an air-water mixture and is discharged to the separation chamber. Here air is discharged and water is returned from the return valve to the impeller inlet. This is repeated until the air is exhausted, and the internal-mixing self-priming pump sucks in water. The working principle is the same as that of the external-mixing self-priming.
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 height of the liquid level in the separation chamber. The smaller the front seal clearance of the impeller, the greater the self-priming height, generally 0.3~0.5 mm; when the clearance increases, the pump 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 decrease accordingly. Under other conditions 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 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 It is convenient for the return water to shoot deeply into the impeller cascade.
Most self-priming pumps are matched with internal combustion engines and are mounted on movable carts, which are suitable for field operations.

The ZW self-priming pump is an energy-saving pump product developed after absorbing, digesting and improving the relevant technical data at home and abroad. The pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, convenient maintenance, high efficiency, long life, and strong self-priming ability. There is no need to install a bottom valve in the pipeline, and only need to keep the quantitative priming liquid stored in the pump body before work, so the pipeline system is simplified and the working conditions are improved.
The main purpose:
1. Equipped with a rocker-arm sprinkler, it can spray water into small raindrops after being flushed into the air. It is a good machine for farms, nurseries, orchards and tea gardens.
2. It is suitable for clean water, seawater, chemical medium liquid with acidity and alkalinity, and slurry with general paste (medium viscosity ≤ 100 centipo, solid content up to 30%).
3. It can be used with any filter press of any model and specification, and the most ideal matching pump type to send the slurry to the filter press for pressure filtration.
The ZW self-priming non-clogging sewage pump is a new type of pump that integrates self-priming and sewage discharge based on the structure and performance of the ZX self-priming centrifugal pump and the QW submersible sewage pump, drawing on the advantages of similar foreign products kind. It can not only do not need to install bottom valve, do not need to irrigate water, but also suck the dirt, sediment, which contains large solids whose diameter is 60% of the outlet diameter and the fiber length is 1.5 times of the impeller diameter. Waste mineral impurities, manure treatment and all engineering sewage and colloidal liquids, completely reduce the labor intensity of manpower, and are easy to install and use, rarely maintain, and the performance reaches the international advanced level. It has a broad application market and development prospects.
Features:
1. Strong sewage discharge capacity: The special impeller anti-blocking design ensures that the pump is highly efficient and has no blockage.
2. High efficiency and energy saving: using excellent hydraulic model, the efficiency is 3 to 5% higher than the general self-priming pump.
3. Good self-priming performance: The self-priming height is 1 meter higher than the general self-priming pump, and the self-priming time is shorter.
Product Usage:
ZW self-priming non-clogging sewage pump is suitable for industries such as chemical industry, petroleum, pharmacy, mining, papermaking, fiber, pulp, textile, food, power plant and municipal sewage engineering, sewage drainage of public facilities, and river pond aquaculture.
technical parameter:
Flow rate: 5-800m3/h;
Head: 12-60m;
Motor power: 2.2-55KW;
Speed: 1450-2900r/min;
Caliber: φ25-φ300;
Medium temperature: ≤100℃;
Self-priming height: 4.5-6.0m.
5. Model meaning:
For example: 50ZW15-30
50-Import diameter (mm)
ZW-self-priming non-clogging sewage pump 15-flow (m3/h)
30-head (m)
P-material stainless steel

B-Explosion-proof motor