CN2204344Y

CN2204344Y - Centrifugal pump impeller

Info

Publication number: CN2204344Y
Application number: CN 93239073
Authority: CN
Inventors: 杜同
Original assignee: CHENGDU DUTONG INST OF WATER TURBINE
Current assignee: CHENGDU DUTONG INST OF WATER TURBINE
Priority date: 1993-08-02
Filing date: 1993-08-02
Publication date: 1995-08-02
Anticipated expiration: 2002-12-23

Abstract

The utility model relates to A centrifugal pump impeller which is used for working in water with multiple mud. The place between every two main blades of the impeller is provided with one or two back blades with a shorter length according to the actual requirement, and the one or the two back blades are positioned at the outer part of a flow passage to improve the cavitation erosion in the flow passage. The utility model can be used for assembling all existing centrifugal water pumps and reversible pump turbines with various forms.

Description

Centrifugal pump impeller

The utility model relates to a kind of centrifugal pump impeller that is applicable in the high concentration of sediment water.

The centrifugal pump impeller of modern extensive use is being fixed between its front and rear cover plate along the equally distributed some length of the circumference blade identical with curvature.The working surface of these blades is that the upstream face of sense of rotation is a pressure side, and its back side is low pressure surface.Along with the increase of specific speed of pump in modern age, this low pressure will further develop, and the formation current separate with vacuum side of blade, the common name separation of flow.When big flow, the separation of flow (please referring to Trofim Lomakin work " Centrifugal Pumps ﹠ Axial Pumpss " 91 pages, China Machine Press's version in 1987) also can appear in the front of blade simultaneously.As everyone knows, the separation of flow very easily causes cavitation.When containing a large amount of silt in the water, because the proportion of silt is much larger than the proportion of water, the effect of inertia of silt makes this class separation of flow serious more and produce cavitation, causes impeller to destroy.These cavitation cavitys also will enter volute with current, cause the destruction of volute.The water inlet limit of impeller blade is the minimum position of pressure, even cavitation also takes place in clear water easily; Because above-mentioned silt will make its cavitation more serious.The two is exactly that modern clear water is quick in high concentration of sediment water with centrifugal pump, the reason of heavy damage.

The purpose of this utility model provides and a kind ofly can overcome long centrifugal pump impeller of above-mentioned technical disadvantages, do not produce quick heavy damage in high concentration of sediment water, life-span, thereby solves the rapid damage problem of whole water pump.

The purpose of this utility model is achieved in that if at modern impeller D ₁With D ₂Between increase one or two concentric circle D _mOr D _MaAnd D _Mb, promptly can be considered as this impeller the impeller of two or three series operations.Its total head i.e. the summation of two or three impeller lifts for this reason.Because their number of blade equates, so the leaf grating of the little impeller of diameter is than the leaf grating ratio much larger than the big impeller of diameter.Just diameter is big more, and blade is more little to the Shu Yueli of current.Here it is, and the diameter general goal is easy to generate the reason of the separation of flow.For this reason, the utility model has adopted between impeller channel two blades, partly increases a back blades as shown in Figure 1 in major diameter; Perhaps increase by two back blades as shown in Figure 2.Thereby increased major diameter leaf grating ratio partly, and that is to say and strengthened the restraining force of blade current, can prevent the generation of separation of flow phenomenon effectively.Can overcome the cavitation damage in the high concentration of sediment water like this, owing to adopted such scheme, the utility model centrifugal pump impeller in high concentration of sediment water, to work and to have the very long life-span.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model first embodiment's a impeller.Among the figure: 1 is impeller body, and 2 is that primary blades, 3 is back blades.From figure, can see a plurality of primary blades (2) are housed in impeller body (1).A back blades (3) that is shorter in length than primary blades is housed between per two primary blades (2).

Fig. 2 is the utility model second embodiment's a impeller.Among the figure: 4 is that impeller body, 5 is that primary blades, 6 is that first back blades, 7 is second back blades.

Above-mentioned first, second embodiment's impeller can be formed the centrifugal water pump and the Reversible Pump-Turbine of all various types of modern times.

The method that realizes above-mentioned two kinds of embodiments of the present utility model and research, design, the conventional water pump of manufacturing, pump turbine are the same substantially, so the difficulty of there is no.

Claims

A kind of centrifugal pump impeller, the impeller wheel body is provided with a plurality of primary blades, it is characterized in that being provided with between each primary blades one or two back blades, back blades be shorter in length than primary blades length.