The self-priming pump adopts an external mixing axial return pump body structure. The pump body is composed of a liquid suction chamber, a liquid storage chamber, a volute, a return hole, and a gas-liquid separation chamber. After the self-priming pump is started, under the action of centrifugal force, the remaining liquid in the water suction chamber and the air in the liquid inlet pipeline are stirred by the impeller to form a gas-free mixture, and the mixture enters the gas-liquid separation chamber through the volute. As the speed slows down, As a result, the gas and water are separated, the air is discharged from the pump outlet, and the liquid returns to the pump through the return hole. After several cycles, the air in the liquid inlet pipeline is exhausted, so that a certain degree of vacuum is formed in the pump, and the self-priming pump reaches The role of self-priming.
The self-priming pump is composed of pump body, impeller, shaft, frame, motor and other components, with precise structure and convenient movement. Under normal installation conditions, the suction height of the self-priming pump is 3 meters. If the suction height needs to be further increased in a certain occasion, then the suction pipe should be as short as possible during installation. The suction of the self-priming pump should avoid valves and elbows as much as possible. and tee. The vertical height of the discharge pipe is within 1 meter, and the vertical height of the pump outlet is within 1 meter, and there is no elbow in the middle, so the maximum suction height of the self-priming pump can be obtained.
The self-priming pump body is provided with a gas-water separation chamber which communicates with the outlet, and a water storage chamber which communicates with the return valve. When self-priming, the return valve is automatically opened, and the return valve body has a cone-shaped nozzle facing the impeller, which helps to increase the self-priming speed during self-priming. There is a rubber valve plate between the water inlet joint and the pump body, which will automatically close when it stops, and keep the pump full of liquid for the next pumping. The lower end of the inlet of the self-priming pump is provided with a liquid discharge port, and the liquid material in the pump can be drained by twisting the cover of the liquid port. Both the liquid outlet and the liquid inlet are sealed with rubber seals, and the seal on the rotating shaft is sealed with a mechanical seal.
Fill the pump casing with water before starting the self-priming pump. 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, which makes the water inlet check door open, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel. The self-priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance and high efficiency. Self-priming pumps are suitable for the discharge of heavily polluted wastewater from factories and businesses, sewage discharge stations in main residential areas, water distribution systems in urban sewage treatment plants, drainage stations in civil air defense systems, water supply equipment in waterworks, sewage discharge in hospitals and hotels, and municipal engineering Construction sites, mine supporting machinery, rural biogas digesters, farmland irrigation and other industries, conveyor belt particles of sewage, dirt, can also be used for clean water and weak corrosive media.
When the self-priming pump absorbs water from the pool, if the self-priming water-absorbing method is adopted, the water-absorbing pipe can be filled with water all the time. The degree of automation and reliability of pump priming.
The self-priming water suction method that is often used is to make the axis elevation of the self-priming pump lower than the working water level of the self-priming pump in the pool. This method is often used in buildings with basements. When arranging, the self-priming pump room is set in the basement, and the pool is set next to the self-priming pump room in the basement or outdoors underground. In this way of water absorption, the working water level of the self-priming pump in the pool is higher than the axis elevation of the self-priming pump, so that the suction pipe is always filled with water, which can ensure that the self-priming pump starts automatically and quickly.
Install a suction bottom valve at the end of the suction pipe of the self-priming pump. The suction bottom valve is actually a check valve, which ensures that the water flow can only enter the suction pipe from the pool and cannot flow backwards, so if the suction pipe of the self-priming pump is filled with water, even though the axis of the self-priming pump is higher than the self-priming pump of the pool However, due to the function of the suction bottom valve, the water in the suction pipe will not flow into the pool, so that the water suction pipe will always be filled with water to ensure that the self-priming pump can start automatically and quickly. The reliability of this water absorption method is affected by the quality of the suction bottom valve. For example, if it is not closed tightly or leaks, the water in the suction pipe will slowly flow into the pool. After a long time, there will be no water in the suction pipe, causing the self-priming pump to start. Manual irrigation is still required.
Other water sources can be used for this purpose. It installs a pipe in front of the check valve of the outlet pipe of the self-priming pump on the basis of the above water absorption method, and connects this pipe to the outdoor municipal water supply pipe or other external water sources to supply water to the suction pipe of the self-priming pump. The water leaked from the bottom valve fills the suction pipe with water.
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