CN2346966Y

CN2346966Y - Centrifugal-axial flow two-staged pump

Info

Publication number: CN2346966Y
Application number: CN 98208584
Authority: CN
Inventors: 余荣林; 余修洋
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-29
Filing date: 1998-03-29
Publication date: 1999-11-03
Anticipated expiration: 2008-03-29

Abstract

The utility model relates to a centrifugal-axial flow two-stage pump. The structure is characterized in that a first stage impeller adopts a centrifugal impeller, a second stage impeller adopts an axial flow impeller, simultaneously, liquid extracted by the first stage impeller has two outlets, one outlet goes into a second stage impeller, and the other outlet is extracted to the outlet of the pump through a one-way valve and a by-pass channel directly. As the shaft power of a centrifugal pump and the axial flow pump has mutual adjustment compensating action, on a characteristic curve of the pump, when the change of flow and lift is large, the shaft power changes smoothly, and the utility model is an economical pump. The utility model is suitable for occasions with large and frequent pipe network flow and lift, and the utility model is especially suitable for a movable pump, such as an irrigation pump for countryside irrigation.

Description

Centrifugal--the axial flow two-stage pump

The utility model belongs to the liquid pump technical field, is a kind of centrifugal--the axial flow two-stage pump.

Centrifugal pump and axial-flow pump all belong to the high efficiency pump, their Q (flow)--H (lift)--P (the moving rate of axle) characteristic curve have nothing in common with each other (referring to this Figure of description 2 and accompanying drawing 3).When they are used for fixing occasion, their Operational Limits can guarantee in the curved section of economic stability.And when they be used for changeable or moving field fashionable, as Q value increase, the H of centrifugal pump will reduce, P will increase; The H of axial-flow pump will reduce, and P also will reduce.Increase as the H value, the Q of centrifugal pump will reduce, and P also will reduce; The Q of axial-flow pump will reduce, and P will increase.In other words: because the power engine power of pump institute adapted is changeless, centrifugal pump may overburdening and axial-flow pump may low load with strong power when Q increased, and when H increased, centrifugal pump may low load with strong power, and axial-flow pump then might overburdening.This operation conditions all is uneconomic.

The purpose of the utility model just is to remedy the deficiency of above technology, and provides a kind of when Q, H value amplitude of variation are big, less economical centrifugal of its P value variation--axial flow two-stage pump.

The purpose of this utility model is achieved in that a kind of centrifugal--the axial flow two-stage pump, by access cover (1), shell (2), outlet cover (3), interior honeycomb duct (4), main shaft (5), first order impeller (6), second level impeller (7) and comprise valve plate (9), the one-way valve (8) of barrier film (10) is formed, it is characterized in that: a, first order impeller is a receded disk impeller, b, second level impeller is an aial flow impeller, c, between shell (2) and the interior honeycomb duct (4) a ring-type chuck that can flow through liquid, simultaneously: d, a controlling liquid is housed in this ring-type chuck to its working condition of one-way valve (8) of Way out one-way flow is: power engine drives main shaft (5) rotates both stage impellers simultaneously.When needs Q value is big, the liquid that throws away from first order impeller (6), a part is discharged through second level impeller (7), another part is pushed the annular channel shunting of one-way valve (8) between shell (2) and interior honeycomb duct (4) open and is discharged, at this moment, the air horsepower of first order impeller (6) will increase, and the air horsepower of second level impeller (7) will reduce, and make the line shaft power P of pump be unlikely to increase overburdening because of Q.When needs H value is big, one-way valve (8) is closed automatically, to all after second level impeller (7) pressurization, discharge from the liquid that first order impeller (6) throws away, the air horsepower of the first order impeller (6) of this moment will reduce, and the air horsepower of second level impeller (7) will increase, total air horsepower of pump is unlikely to because of H increases overburdening, and the air horsepower of both stage impellers compensates mutually, makes the air horsepower P of entire pump keep more stable state.

Therefore, adopt effect of the present utility model just to be under the bigger situation of flow Q, lift H amplitude of variation, it is less to keep the air horsepower P of pump to change relatively, thus the phenomenon that reduces overburdening or low load with strong power takes place.Pump can be moved under the state of economic stability.This pump is particularly suitable for using under the big and frequent occasion of in Liquid tube net flow, pressure amplitude, is more suitable in rural area movable irrigation pump.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the utility model structure diagrammatic cross-sectional view.

Fig. 2 is the Q (flow) of centrifugal pump--H (lift)--P (air horsepower) characteristic curve shape figure.

Fig. 3 is the Q (flow) of axial-flow pump--H (lift)--P (air horsepower) characteristic curve shape figure.

Fig. 4 is Q of the present utility model (flow)--H (lift)--P (air horsepower) characteristic curve shape figure.

As shown in Figure 1, access cover has the water inlet on (1), and outlet cover has osculum on (3), the pump case housing that they and shell (2) three form a whole, its effect is to hold other component of this pump and water conservancy diversion liquid, adopts between them to removably connect, so that assembly and disassembly.First order impeller (6) is a receded disk impeller, and it is contained in the inboard of access cover (1); Second level impeller (7) is an aial flow impeller, and this is contained in the inboard of outlet cover (3), and they all are fixed on the main shaft (5).Transmit the power of external impetus machine input by main shaft (5), simultaneously rotary work.The import that exports to second level impeller (7) at first order impeller (6) is a cavity that is contained by shell (2), its effect is a water conservancy diversion liquid, the liquid here has two outlets, one is the import of second level impeller (7), another is a ring-type split channel that forms by between shell (2) and the interior honeycomb duct (4), interior honeycomb duct (4) is the cover of a taper, contain second level impeller (7) in the cover, water conservancy diversion shell as second level impeller (7), cover is outer then to form a ring-type class cover with shell (2), as split channel, an one-way valve (8) that only allows liquid to flow to the delivery side of pump direction is housed on this passage, the simple structure of this valve is made up of a ring-type valve plate (9) and a ring-type barrier film (10) with holes with holes, valve plate (9) is in the position near first order impeller (6), barrier film (10) is then in the position near this one side of pump discharge, when the delivery side of pump lift is not high, push barrier film (10) open from the liquid that first order impeller (6) is discharged, one-way valve (8) is opened, partially liq is directly arranged to delivery side of pump from the by-pass flow passage, when the delivery side of pump lift increases, the highly pressurised liquid of outlet section overlays barrier film (10) on valve plate (9), and one-way valve (8) is closed.For guaranteeing the intensity of interior honeycomb duct (4), interior honeycomb duct (4) is fixed on the inwall of shell (2), for the shell (2) of casting or welding, then both should be cast or be welded into one.

By figure (4) as seen, this pump when Q, H value amplitude of variation are big-, its moving rate P changes steady, so this pump is adapted to pipe network Q, H vary within wide limits, and frequent occasion, during use both economical reliably.

Claims

1, a kind of centrifugal--the axial flow two-stage pump, by access cover (1), shell (2), outlet cover (3), interior honeycomb duct (4), main shaft (5), first order impeller (6), second level impeller (7) with comprise that the one-way valve (8) of valve plate (9), barrier film (10) forms, it is characterized in that:

A, first order impeller are receded disk impellers,

B, second level impeller are aial flow impellers,

Between c, shell (2) and the interior honeycomb duct (4) a ring-type chuck that can flow through liquid, simultaneously:

The one-way valve (8) of a controlling liquid to the Way out one-way flow is housed in d, this ring-type chuck.

2, pump according to claim 1 is characterized in that said first order impeller (6) is contained in the inboard of access cover (1), and second level impeller (7) is contained in the inboard of outlet cover (3), and they all are fixed on the main shaft (5).

3, pump according to claim 1 is characterized in that said interior honeycomb duct (4) is fixed on the inwall of shell (2).