Different types of self-priming pumps

This article is going to tell you something about different types of self-priming pumps.

This article contains the following:

• Different types of self-priming pumps

• The working principle of the external mixing self-priming pump

• The working principle of internal mixing type self-priming pump

Different types of self-priming pumps

Self-priming pumps are divided into the following categories according to the principle of action: 1. Gas-liquid mixing type (including internal mixing type and external mixing type); 2. Water ring wheel type; 3. Jet type (including liquid jet and gas jet). The working process of the gas-liquid mixed self-priming pump: due to the special structure of the self-priming pump body, after the pump stops, there is a certain amount of water in the pump body. Fully mixed and discharged into the gas-water separation chamber, the gas in the upper part of the gas-water separation chamber overflows, and the water in the lower part returns to the impeller to re-mix with the remaining air in the suction line until all the gas in the pump and suction pipe is discharged Aspirate and pump water normally. The water ring wheel self-priming pump is to combine the water ring wheel and the water pump impeller in a casing, and discharge the gas by the water ring wheel to achieve self-priming. When the pump works normally, the channel of the water ring wheel and the water pump impeller can be cut off by the valve, and the liquid in the water ring wheel can be drained. The jet-type self-priming pump is composed of a centrifugal pump and a jet pump (or ejector). It relies on a spray device to create a vacuum at the nozzle to achieve suction.

According to the type of pump supporting power machine, it is divided into self-priming pump supporting electric motor and self-priming pump supporting diesel engine.

According to the structure and working characteristics of the self-priming function, it can be divided into internal sliding type, external sliding type, water ring wheel type and other types. Transmission methods include direct drive (including inner shaft) and belt drive. The inlet diameter is 25-200 mm.

The working principle of the external mixing self-priming pump

The working principle of the external mixing self-priming pump is that the water discharged by the impeller into the gas-water scattering chamber flows back to the outer edge of the impeller through the arranging return water hole. Under the influence of pressure difference and gravity, the water flowing back from the left return hole is shot into the impeller channel and crushed by the impeller. After being mixed with the air from the suction pipe, it is thrown to the volute and the vacuum pump is used Pump gear pump corrosion-resistant pump acid-resistant pump fire pump to reverse the purpose of the target. Then it merges with the water flowing from the right return hole and runs along the volute. Because the liquid has been striking the cascade in the volute and has been crushed by the impeller, it is stirred with the air, and the water is stirred up by the air and water. The turbidity was peeled off at the outlet of the volute, and entered the loosening chamber along the short tube. The air in the loose room is scattered, and is lost by the outlet pipe, while the water still flows to the outer edge of the impeller through the circulated return water hole, and is mixed with the air in the suction pipe. After repeated cycles, the air in the suction pipe is gradually exhausted, so that the water enters the pump and the self-priming process is completed.

The working principle of internal mixing type self-priming pump

The internal mixing type self-priming pump works similarly to the external mixing type self-priming pump, 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 return the liquid in the pump to the inlet of the impeller. The water is mixed with the air from the suction pipe under the impingement of the impeller's high-speed dynamic bomb, and the air-water turbidity is formed and discharged to the loosening chamber. Here the air is overhead and the water returns from the return valve to the impeller inlet. This is repeated until the air is exhausted and water is sucked in.

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