CN2301566Y

CN2301566Y - Case of low cavitation centrifugal pump for water pumping room capable of counter flowing

Info

Publication number: CN2301566Y
Application number: CN 97205918
Authority: CN
Inventors: 曹洪海; 刘秀云
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-28
Filing date: 1997-01-28
Publication date: 1998-12-23
Anticipated expiration: 2007-01-28

Abstract

The utility model relates to a casing of a low cavitation centrifugal pump for water pumping rooms capable of counter flowing. The extending surface of two tangent lines of a circular casing (3) is formed into an inner wall (7) of an elliptical water outlet pipe, the end of the inner wall (7) of the water outlet pipe is formed into a water outlet (1), one side of the inner wall (7) of the water outlet pipe is crossed with the inner wall (6) of the circular casing to form a pump tongue (2) with the casing (3), and a circular pressure water room (4) is formed between the inner wall (6) of the circular casing and a blade wheel (5). The utility model is characterized in that the included angle alpha formed by the cross of one side of the inner wall (7) of the water outlet pipe and the inner wall (6) of the circular casing is 75 DEG to 180 DEG. The utility model has the advantages of favorable performance of anti cavitation, long service life, low manufacture cost, big liquid drainage quantity and convenient popularization.

Description

The low cavitation erosion of reversible flow pumping chamber centrifugal pump pump case

The utility model relates to a kind of centrifugal pump pump case, is specially the low cavitation erosion of a kind of reversible flow pumping chamber centrifugal pump pump case.

Making in the society at present and use in centrifugal pump (as transh pump, slurry pump) mostly adopt spiral or the loop type pumping chamber, and between the runner pump case inwall of its pumping chamber and outlet pipe one side inwall, be provided with the pump tongues of its angle of intersection less than 75 degree, owing to adopt the pump tongue of this structure, when centrifugal pump is worked, under the centrifugal action of impeller rotation, fluid will flow along the impeller sense of rotation in pumping chamber, when flow of liquid during to pump tongue position, most of flow direction pumping hole and being discharged from, small amount of liquid is the flow back into pumping chamber under the effect that its coherence and pump tongue stop, therefore will produce a kind of liquid at high speed line stream effect in pump tongue position, because this liquid at high speed is imitated the existence of line stream effect, the one, have the defective that reduces centrifugal pump lifting rate in the unit time; The 2nd, have the pump tongue is produced strong cavitation erosion effect, seriously influence the defective in working life of pump tongue.In order to improve the working life of pump tongue, the alloy material that it is good that people once adopted wear-resisting property is made the scheme of pump tongue, though this scheme can improve the working life of pump tongue to a certain extent, but effect is also not obvious, and its manufacture cost height, this is the unsurmountable defective that existing centrifugal pump pump case exists.

Task of the present utility model is to provide that a kind of anti-cavitation performance is good, long service life, low cost of manufacture, lifting rate are big, is suitable for the low cavitation erosion of universal novel reversible flow pumping chamber centrifugal pump pump case.

Task of the present utility model takes following scheme to realize.

Accompanying drawing has provided structural representation of the present utility model.

In the accompanying drawings, (1) is water outlet, and (2) are the pump tongue, and (3) are pump case, and (4) are pumping chamber, and (5) are impeller, and (6) are the pump case inwall, and (7) are the outlet pipe inwall.

With reference to the accompanying drawings, the utility model is by forming on two tangent line elongated surfaces on the circular casing (3) Oval outlet pipe inwall (7), the end of its outlet pipe inwall (7) consists of delivery port (1), Intersect rear and pump case (3) by the side on the outlet pipe inwall (7) and circular casing inwall (6) Between consist of pump tongue (2), looping setting-out between circular casing inwall (6) and the impeller (5) Chamber (4) is characterized in that said by in the side and circular casing on the outlet pipe inwall (7) It is the 75-180 degree that wall (6) intersects formed angle α.

Side on the outlet pipe inwall described in the utility model (7) can be arc shape and and annular pump Shell inwall (6) intersects or is tangent.

Below will be described as follows working procedure of the present utility model with reference to the accompanying drawings, when centrifugal pump is worked, impeller (5) will be along B to making high speed rotating, enter liquid in the pumping chamber (4) under the effect of the high speed rotating power of leaf (5), in pumping chamber (4), flow along the impeller sense of rotation, when flow of liquid will be discharged from from water outlet (1) during to outlet pipe, because the angle on the pump tongue (2) is greater than 75 degree, so can not stop liquid flow back into pumping chamber, thereby realize overcoming high speed line stream effect and improve the pump tongue task in working life, simultaneously under the effect that flows into outlet pipe flow of liquid power, will bring the partially liq near the pumping chamber (4) that is in the pump tongue (2) into outlet pipe and be discharged from, thus the task of realization reversible flow.

In sum, can effectively realize task of the present utility model, for society provides that a kind of anti-cavitation performance is good, long service life, low cost of manufacture, lifting rate are big, be suitable for universal novel reversible flow pumping chamber to hang down the cavitation centrifugal pump.

Claims

1, a kind of reversible flow pumping chamber hangs down cavitation centrifugal pump pump case, by forming oval outlet pipe inwall (7) on two tangent line elongated surfaces on the circular casing (3), the end of its outlet pipe inwall (7) constitutes water outlet (1), intersect formation pump tongue (2) between back and the pump case (3) by side on the outlet pipe inwall (7) and circular casing inwall (6), looping pumping chamber (4) between circular casing inwall (6) and the impeller (5) is characterized in that said is the 75-180 degree by side on the outlet pipe inwall (7) and the crossing formed angle α of circular casing inwall (6).

2,, it is characterized in that the side on the said outlet pipe inwall (7) can be arc shape and crossing or tangent with circular casing inwall (6) according to the low cavitation centrifugal pump pump case of the described reversible flow pumping chamber of claim 1.