What is the principle of self priming pump and how does it work

The working principle of the self-priming pump is:

Before the pump is running, there is a certain amount of water in the pump chamber, and after the pump starts, due to the rotation of the impeller, the air and water in the suction pipeline are fully mixed and discharged to the air-water separation chamber. The gas in the upper part of the gas-water separation chamber escapes, and the water in the lower part returns to the impeller, and is mixed with the remaining gas in the suction pipeline again until all the gas in the pump and the inlet pipeline is exhausted, and the self-priming is completed, so that the pump enters the normal working state.

Its performance characteristics are:

Adopting the design principle of gas-liquid external mixing, the structure of the pump is more perfect.

Optimize the hydraulic model to improve the self-priming capacity and comprehensive performance.

The dynamic seal structure is adopted, and the traditional mechanical or packing seal is canceled, and the seal-free self-priming is truly achieved.

According to the variety of the medium, the corresponding material can be selected to make the self-priming pump.

Simple structure, small size, light weight, easy installation and maintenance

No leakage, high suction range, easy maintenance, can replace submersible pumps, long-shaft pumps, submersible pumps to transport low-level media.

Self-priming pumps work by filling the casing with water (or containing water in the casing) before the pump starts. After starting, the high-speed rotation of the impeller makes the water in the impeller channel flow to the vortex shell, and then the inlet forms a vacuum, so that the water inlet backstop door is opened, and the air in the suction pipe enters the pump, and reaches the outer edge through the impeller channel.

The working principle of the self-priming pump is: the self-priming pump can send water out due to the action of centrifugal force. Before the water pump works, the pump body and the water inlet pipe must be filled with water to form a vacuum state, when the impeller rotates rapidly, the blades promote the water to rotate quickly, and the rotating water flies away from the impeller under the action of centrifugal force, and the water in the pump is thrown out, and the central part of the impeller forms a vacuum area.

The water in Suwon is pressed through the pipe network into the inlet pipe under the action of atmospheric pressure (or water pressure). In this way, continuous pumping is possible. It is worth mentioning here that:

Before starting the self-priming pump, it must be filled with water in the pump casing before it can be started, otherwise it will cause the pump body to heat up, vibrate, reduce the water output, and cause damage to the pump (referred to as "cavitation") and cause equipment accidents.

The working principle of the self-priming pump is as follows:

The biggest advantage of the self-priming pump is that it does not need to fill the pump except for the first use, the medium in the storage chamber will be mixed with the gas in the pipeline through the volute to reach the gas-liquid separation chamber, and then the gas is discharged from the exhaust hole, the liquid continues to enter the reservoir, and then continues to enter the pipeline and the gas in the pipeline is fully mixed, repeat this process until all the air is discharged, and the self-priming pump begins to run normally, saving a lot of time, and there is no need to constantly fill the pump.

The pumps all adopt the pump body structure of axial liquid return. The pump body is composed of suction chamber, liquid storage chamber, scroll chamber, liquid return hole, gas-liquid separation chamber, etc., after the pump starts normally, the impeller will inhale the liquid stored in the suction chamber and the air in the suction pipeline together, and be completely mixed in the impeller, under the action of centrifugal force, the liquid entrained gas flows to the outer edge of the scroll chamber, and forms a white foam belt with a certain thickness and a high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas-liquid separation chamber through a diffusion tube.

At this point, due to the sudden decrease in the flow rate, the lighter gas is separated from the gas mixture, and the gas continues to rise and be discharged through the pump body spout. The degassed liquid returns to the reservoir and enters the impeller again through the reflux hole, mixes with the gas sucked in from the suction line inside the impeller, and flows to the outer edge of the impeller under the action of the high-speed rotating impeller. As the process progresses over and over again, the air in the suction line decreases until the gas is exhausted and the self-priming process is completed, and the pump is put into normal operation.

Some pumps also have a cooling chamber at the bottom of the bearing body. When the bearing temperature rises more than 70 degrees due to heating, the coolant can be injected into the cooling chamber through any coolant pipe joint to circulate cooling. The sealing mechanism inside the pump to prevent the leakage of liquid from the high-pressure area to the low-pressure area is the front and rear sealing rings, the front sealing rings are installed on the pump body, and the rear sealing rings are installed on the bearing body, when the pump is worn to a certain extent after long-term operation, and affects the efficiency and self-priming performance of the pump, it should be replaced.

Due to the small site in the building and the small amount of drainage centrifugal pumps, the drainage pumps can give priority to submersible sewage pumps and underwater drainage pumps, among which the underwater sewage pumps are generally used in important places; Vertical sewage pumps and horizontal sewage pumps require seismic isolation foundations, self-filling water absorption, and occupy a certain amount of space, so they are rarely used in buildings. The flow rate of the drainage pump should be selected according to the second flow rate of the domestic drainage design; When there is a displacement adjustment, it can be selected according to the maximum hourly flow rate of domestic drainage. The flow rate of the drainage pump in the fire elevator sump is not less than 10L s.

The head of the drainage pump is determined according to the lifting height and pipeline loss, and then a certain free head is added. Free head should be used. The flow rate of the suction pipe and outlet pipe of the drainage pump should not be less than and should not be greater than.

A standby pump should be set up in each domestic drainage collection tank in the public building, and it should be operated interactively at ordinary times. Basement, equipment room, garage to flush the ground drainage, if there are two or more drainage pumps, do not need to use pumps. When the sump cannot be equipped with an accident drainage pipe, the pump should have uninterrupted power**; When the drainage inlet pipe can be closed, there is no uninterruptible power**, but an alarm device should be set.

When lifting sewage and wastewater with large impurities, the outlet pipes of submersible sewage pumps in different sumps should not be combined and discharged; When lifting general wastewater, the submersible sewage pump outlets of different sumps can be considered for combined discharge according to the actual situation. When two or more pumps share a single outlet pipe, valves and check valves should be installed on the outlet pipe of each pump. When there is a possibility of backflow in the drainage of a single pump, a check valve should be installed.

It is not allowed to combine the pressure drain with the gravity drain pipe in the building. When there are large pieces of debris in the lifting of the submersible sewage pump with pipeline centrifugal pump, the submersible sewage pump should be equipped with a crushing device; When lifting sewage containing more fibers, it is advisable to use a large-channel submersible sewage pump. When the motor power of the submersible sewage pump is greater than or equal to or the diameter of the outlet pipe is greater than or equal to DN100, the fixed autocoupling device of the pump can be used; When the motor power of the submersible sewage pump is less than or the diameter of the outlet pipe is less than DN100, the hose can be installed in a mobile manner.

When the sewage collection tank is drained by a submersible sewage pump, a fixed self-coupling device for the pump should be set up to facilitate the maintenance of the pump. The dewatering pump should be able to start and stop automatically and manually on site. Multiple pumps can be operated in parallel and alternately, or they can be put into operation in sections.

The bearing of the water pump is damaged, which will cause the water pump to run abnormally.

The fan blades of the water pump fall off, and the high flow rate of the water drives the fallen blades to hit, forming a pump abnormal sound.

If the temperature of the pump is too high, there will also be a sound.

Self-priming pumps work by filling the casing with water (or containing water in the casing) before the pump starts. After starting, the high-speed rotation of the impeller makes the water in the ridge wheel channel of the blade simple mold flow to the vortex shell, and then the inlet forms a vacuum, so that the water inlet yard branch backstop door is opened, 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, high efficiency and seepage retention rate, long life, and strong self-priming ability.

There is no need to install a foot valve in the pipeline, and only need to ensure that the pump body is stored with quantitative fluid extraction before working. Self-priming pumps of different materials can be used for different liquids.