CN2257334Y

CN2257334Y - Double volute multi-stage pump water intake section

Info

Publication number: CN2257334Y
Application number: CN 96207955
Authority: CN
Inventors: 柳雨霁
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-23
Filing date: 1996-04-23
Publication date: 1997-07-02
Anticipated expiration: 2006-04-23

Abstract

The utility model relates to an improved double scroll multistage pump water intake section which is composed of an elliptical outer shell, an annular water absorbing chamber, a water intake pipe, a stop opening, a material filling chamber, etc. The utility model is characterized in that at the same time that the water intake section maintains an elliptical shape, the water aborbing chamber is changed into an annular water absorbing chamber to form a double wall structure. The utility model can effectively improve the flow condition in a cavity chamber of the water absorbing chamber and eliminates the influence of the change of a section of the elliptical water absorbing chamber of the original design on the flow speed of liquid flow. The speed field in the water absorbing chamber of a pump is effectively improved and simultaneously the whole shapes of the water intake section and the middle section of a pump body also keep consistent.

Description

Two volute multistage pump inlet segments

The utility model relates to a kind of inlet segment that is used for two volute multistage pumps and has annular suction chamber.

Two volute multistage pumps turn round within very big range of flow steadily because of it, and the radial thrust of each impeller reaches complete equilibrium and becomes comparatively advanced in the recent period general multistage pump.This kind pump is two volutes because of the pump housing, and its profile is ellipticity.In order to keep the unanimity of pump housing overall sizes, the inlet segment gabarit is oval, and the suction chamber inner chamber is oval in shape also.The function of suction chamber is that liquid is introduced impeller from suction sleeve, and speed is evenly distributed when requiring liquid to flow into impeller, and the water conservancy loss is little when requiring flow of liquid to cross suction chamber.Suction chamber to elliptical shape, after liquid stream self-priming water pipe inflow suction chamber can occurring, variation because of the oval inner curve curvature of suction chamber, make the flow section area change, the peripheral compoent of velocity of liquid particle on the different flow sections situation that has nothing in common with each other on the streamline, thus make flox condition more become complicated.The variation of flow stream velocity and the change of moving direction more make the fluid pressure of suction chamber inner chamber change to some extent, and local losses increases, and influence the efficient of pump, further also will influence the cavitation erosion performance at impeller eye place.Therefore, from energy saving, improve the working life of pump and do corresponding improvement with the inlet segment that the angle that alleviates noise pollution is tackled oval suction chamber in two volute multistage pumps.

The purpose of this utility model is that a kind of improved pair of volute multistage centrifugal pump inlet segment will be provided, and it has annular suction chamber, can improve the velocity field of suction chamber liquid stream effectively, makes to flow more evenly, reduces energy loss, more effectively prevents the generation of cavitating.

The purpose of this utility model is achieved in that in the inlet segment of the elliptical profile of two volute multistage pumps, adds an annular suction chamber, at the long axis direction of elliptical profile, forms double-wall structure.In the liquid stream inflow process, each flow section area is in full accord, eliminates the influence that liquid flowing speed is produced because of changes of section.With these two volute multistage centrifugal pumps of designing and developing, both kept the unanimity of monnolithic case, obtain the effect of cavitation erosion improvement in performance again.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the utility model embodiment's an axial sectional view.

Fig. 2 is the left view of Fig. 1.

Fig. 1 has represented the whole-cutaway view that two volute multistage pump inlet segments dissect along axis.The view of Fig. 2 for obtaining from end on projection.By 2 figure as seen, the profile of inlet segment is oval, and transverse overlaps with vertical center line, and suction chamber 1 is an annular, and its lateral projection is the circle that a radius equates.For making wall thickness even, on the Vertical direction of elliptical profile, form double-wall structure, untight crescent-shaped space 2 is arranged between the inside and outside wall, opening is used to remove cast moulding sand to pump housing stage casing one side, and the whole assembling of pump after-opening is hidden by the pump stage casing.The diffuser 3 of intake pipe is tangent with annular suction chamber, and the expansion gradually in cross section has reduced flow losses.Filler chamber 4 is a hollow cylindrical, is formed by stacking along axis with the suction chamber part, is used for shaft end seal.Seam 5 parts and pump housing stage casing are located by connecting.

Claims

1. two volute multistage pump inlet segment, its profile ovalize, intake pipe axis are horizontal line, intersect vertically with the pump shaft line, it is characterized in that: on inlet segment elliptical profile long axis direction double-wall structure is arranged, its inner layer wall looping suction chamber (1).

2. according to claim 1 pair of volute multistage pump inlet segment, it is characterized in that having between dual-layer wall a side is the untight crescent-shaped space (2) of opening.