Self-priming centrifugal pump device function and form is introduced

The type of pump has a lot of, have a centrifugal pump, magnetic pump, pipeline pump, self-priming water pump, submerged pump and so on. Common centrifugal pump is generally not have self-priming function, in the low level service condition, need self-priming centrifugal pump with self-priming function not to do, need to match self-priming centrifugal pump device, self-priming device play what role, what form? A, why the pump to self-priming device? From the above explanation, should be able to see, the impeller rotates, only & other; Have qualitative feeling & throughout; What can be left from the center to around, that formed in the center of vacuum obviously, obviously if the pump cavity filled with air, no matter how fast rotation, can form a vacuum. Centrifugal pump before starting work, therefore, must be in the pump cavity filled with fluid, this is the origin of self-priming device. Second, the basic principle of centrifugal pump the water pump is the use of centrifugal force. When the pump chamber is filled with water, the impeller under the motor drive, fast rotation, water because of the centrifugal force, from the center to the flying all around, the impeller center to form a vacuum, liquid will because the differential of the outside world, flow to the low pressure in the impeller, it will constantly sucking outside liquid. The continued accumulation of liquid forming high pressure at the exit, can from the bottom to the high side of the valve. Three, self-priming device has what kind of form? I've seen two common self-priming device: 1, the use of compressed air to pump casing vacuum water diversion; Start the pump before, in the course of self-priming device, the export side valve to maintain close, or install a back pressure valve, spring action is about 60% when the outlet pressure to achieve work pressure automatically open, vacuum pump must be connected to the pump suction side, and placed in the suction pipe, gas cavity. Usually the root decompression of compressed air, using venturi tube effect, create a vacuum inside the pump shell, water filling, turn the device allows dry centrifugal pump for short periods of time. 2, self-priming device is attached vacuum pump, such as the following emergency fire pump self-priming device, is this a defect pump structure become complex, size, and every start to make sure the water tank filled with water. Four, self-priming pump, self-priming pump, is don't need to infuse water, before starting with the aid of device characteristics of itself can achieve the result of imported exhaust pipeline irrigation. Common self-priming pump is refers to the external mixing type centrifugal self-priming pump, according to the impeller rotation causes the liquid flow vortex, which form a vacuum pump body, so the self-priming pump check valve opens, the liquid from imported sucks, and through the impeller passage convey liquid out, this is the working principle of self-priming pump. Five, the self-priming pump according to action principle is divided into the following categories: 1, the gas-liquid hybrid ( Including internal mixing type and mixed type) ; 2, water ring wheel; Jetting (3, Including liquid jet and gas jet) 。 一个。 Gas-liquid hybrid self-priming pump working process: due to the special structure of the self-priming pump pump body, pump after stalling, there is a certain amount of water in the pump body, pump starts again due to the impeller rotation, suction pipe fully mixing of air and water, and into the gas water separation chamber, the upper part of the gas water separation chamber gas overflow, the lower the water back impeller, mixed with the surplus air inlet line again, until all the pumps and suction tube of gas discharge, complete the imbibition, and normal pumping. b。 Water ring wheel type self-priming pump water ring round and pump impeller combination in a casing, with the aid of water ring round the gas discharge, achieve self-priming. When the pump work normally, can through the valve block water ring and pump impeller channel, and put off water ring round within the liquid. c。 Jetting self-priming pump, the centrifugal pump and jet pump ( Or spray) , rely on the spray device, on the nozzle vacuum suction six, the difference between the ordinary centrifugal water pump and centrifugal pump 1, before starting, self-priming centrifugal pump for the first time when starting to inject a certain amount of starting circulating water in the pump body; Every time the centrifugal pump starting just should be water pipe and pump body filled with water at the same time, or use assistive devices for suction inlet pipe. 2, device, self-priming centrifugal pump in the lower pressure pipe only mesh without bottom valve; The centrifugal pump in the lower pressure pipe must be put bottom valve or equipped with suction device at the exit. 3, run time, the same performance parameters of the pump, self-priming centrifugal pump commonly than centrifugal pump efficiency is low, the cavitation performance is poorer.
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