What are the working principle of self-priming pump characteristics, and what's the difference between a centrifugal pump?

Self-priming pump is a function of self-priming pump, self-priming pump self-priming centrifugal water pump, self-priming magnetic pump, is a kind of centrifugal pump and ordinary is not function of self-priming centrifugal pump, self-priming pump and so on the centrifugal pump in the use of performance of the conventional or have difference, so what's the difference? A, self-priming pump working principle and performance characteristics of self-priming pump is a self-priming centrifugal pump, it has compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life, and have strong self-priming capacity, etc. Line does not need to install the bottom valve, only to ensure storage in pump body before work are quantitative liquid. Different liquid can use different material self-priming pump. Second, the difference between the self-priming centrifugal 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. Gas-liquid hybrid self-priming centrifugal pump work must be done three processes: will the gas reciprocating out within the impeller impeller; Efficient gas-liquid separation; The separated water continually returns to the impeller to go back to work. According to the different parts of water and gas mixing, gas-liquid hybrid self-priming centrifugal pump is divided into the mixed type and mixed type. The gas-liquid separation chamber of water back into the impeller inlet, gas and water within the impeller inlet mixing said mixed type self-priming centrifugal pump. Gas-liquid separation chamber of water back into the impeller outlet, gas and water to mix in the impeller outer edge said outer recirculation self-priming centrifugal pump. The comparison of performance, several common self-priming pump self-priming pump self-priming refers to do not need to be filled with water in the suction tube ( But must have enough water in the pump body) Under the condition of priming pump, have the function of automatic eliminate gas inhalation tube, after a short period of time running into the normal work. Self-priming pump must be enough water to fill before the first start, after starting when starting again by water in the pump body into the normal work. Self-priming pump according to the structure and working principle are divided into the following categories: gas-liquid hybrid ( The mixed type, mixed type) ; Water ring type self-priming pump; Jetting ( Water jet, the gas jet) 。 Several self-priming pump performance comparison is as follows: the mixed type self-priming pump with high efficiency, low manufacture cost, long time, self-priming height less than 10 m, long service life. Outer recirculation self-priming pump efficiency is low, the manufacturing cost of medium and short time of self-priming and self-priming height less than 10 m, long service life. Type self-priming pump water ring pump with high efficiency, high manufacturing cost and short time of self-priming and self-priming height less than 10 meters, short service life. Jetting self-priming pump of low pump efficiency, high manufacturing cost and short time of self-priming and self-priming height can be higher than 10 meters, long service life.
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