Centrifugal self-priming pump

Abstract

The invention discloses a centrifugal self-priming pump. Compared with a traditional method, the pump flow, delivery lift and auxiliary power can be changed, the self-priming time can be shortened, and the pump efficiency can be improved by only cutting the external diameter size of an impeller blade in the pump without particularly changing the size of a volute tongue of a pump body. The centrifugal self-priming pump is characterized in that the pump body is provided with a particularly-designed volute tongue, and an arc length on the volute tongue, which is parallel to the external diameter of the impeller blade, is equal to 1.6-2 times of that of the external diameter of the impeller blade. The performance characteristics of the pump flow, delivery lift and auxiliary power can be changed within certain ranges by only cutting the external diameter size of the impeller blade without cutting the external diameter sizes of a front cover plate and a rear cover plate of a pump impeller, simultaneously turning the thickness of the parts of the front cover plate and the rear cover plate which are not provided with the blade, widening a peripheral bladeless runner by 3-8 millimeters, and controlling the distance between the external diameter of the front cover plate and the rear cover plate of the pump impeller and a parallel arc on the volute tongue to be 0.5-1 millimeter.

Description

1. Technical field [0001] The patent of the present invention relates to a centrifugal pump, especially a centrifugal self-priming pump. 2. Background technology [0002] Centrifugal self-priming pumps can be mainly divided into two types: internal mixing and external mixing in terms of working principle. Internal mixing refers to the mixing of vapor and liquid near the impeller inlet; external mixing refers to the mixing of vapor and liquid at the outer edge of the impeller. Regardless of the type mentioned above, the centrifugal self-priming pump must complete the following three processes in order to achieve self-priming: (1) The gas entering the impeller is continuously taken out of the impeller; Mixing and separation; (3), the separated liquid is continuously returned to the impeller to re-participate in work. According to the above requirements, the existing centrifugal self-priming pumps are equipped with a special partition tongue on the pump body, and have higher r...

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Problems solved by technology

[0003] In December 2007, Guangzhou Water Pump Factory applied for the utility model patent of "A Centrifugal Self-priming Pump", the patent number is [ZL2007 2 0060660.4]. The pump body with the tongue size can change the flow rate, head and supporting power of the self-priming pump, but this method found in the experiment that when the cutting volume is large, the self-priming time of the self-priming pump can be changed compared with the traditional method. position to be extended

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