CN1140704C

CN1140704C - Axial-flow pump

Info

Publication number: CN1140704C
Application number: CNB011246685A
Authority: CN
Inventors: 李文广; 周太勇; 毛玲
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2001-08-02
Filing date: 2001-08-02
Publication date: 2004-03-03
Anticipated expiration: 2021-08-02
Also published as: CN1346938A

Abstract

The present invention relates to a novel axial flow pump. A flow guiding partition board connected with a pump cover is arranged in the pump cover to divide an upper extruding chamber into two cavities, and another flow guiding partition board connected with a pump body is arranged in the pump body to divide a lower extruding chamber into two cavities, wherein the two cavities of the upper extruding chamber and the two cavities of the lower extruding chamber form two spiral cavities. Two semi-cylindrical cavities are arranged in the pump body, and another two semi-cylindrical hollow cavities are arranged in the pump cover, wherein the two cylindrical cavities are symmetrical. Two impellers both arranged on a rotary shaft are respectively positioned in the two cylindrical hollow cavities formed by the two semi-cylindrical cavities in the pump body and the semi-cylindrical cavities in the pump cover. The pump cover is arranged on the pump body to form an integrated semi-spiral suction chamber and the spiral extruding chamber in order to complete the liquid sucking function and the liquid discharge function. The axial flow pump of the present invention decreases the pump volume, simplifies the structure, shortens the length of the rotary shaft, enhances the reliability, facilitates the maintenance and can correspondingly decrease the height of a pump room.

Description

A kind of axial-flow pump

Technical field

The present invention relates to a kind of axial-flow pump.It is a single-stage horizontal double-sucking type axial-flow pump, is mainly used in farmland discharging-irrigating, cooling water of thermoelectric plant circulation, urban water supply and sewerage and the chemical-process.

Background technique

More common axial-flow pump structural type has two kinds of vertical and single-stage horizontal cantilever types in the prior art.For vertical-type axial-flow pump, no matter be common baseplate type or separately-seated type, all have three shortcomings: (1) has only the discharge of dismounting bend pipe, could lift rotor, installs, overhauls trouble; (2) axle is longer, and rotor swing is big, poor reliability; (3) require the pump house height higher.In " the centrifugal pump base of design " of China Machine Press, (published) the 11st page of described middle open type double-suction centrifugal pump in 1974, have two impellers to lean against privately and be installed in the rotating shaft.The plane at place, two the impeller back side is positioned on the geometrical symmetry line OO ' of delivery chamber.

Summary of the invention

The present invention is a kind of axial-flow pump, comprise the pump housing, pump cover, rotating shaft, two suction pipes, a discharge tube are arranged on the pump housing, rotating shaft is installed on two bearing supports that are positioned at pump housing two ends, feature of the present invention is: a diaphragm that links to each other with pump cover is arranged in pump cover, and it is last and perpendicular with the axis of rotating shaft that the plane at diaphragm place is positioned at geometrical symmetry line OO '; One another diaphragm that links to each other with the pump housing is arranged in the pump housing, and the plane at this diaphragm place is positioned on geometrical symmetry line OO ' line and is perpendicular with the axis of rotating shaft; Diaphragm is in the same plane in the diaphragm in the pump cover and the pump housing; To go up delivery chamber by the diaphragm in the pump cover and be divided into two cavitys, will descend delivery chamber to be divided into two cavitys by the diaphragm in the pump housing, two cavitys of last delivery chamber form two spirality cavitys with two cavitys of following delivery chamber respectively.

According to above-described axial-flow pump, it is characterized in that: two half-cylindrical cavitys are arranged in the pump housing, and these two cavitys are symmetrically distributed in geometrical symmetry line OO ' both sides; Two other half-cylindrical cavity is arranged in the pump cover, and these two cavitys are symmetrically distributed in geometrical symmetry line OO ' both sides; Two impellers are installed in the rotating shaft, lay respectively in two cylindrical cavities that two half-cylindrical cavitys in the pump housing and the half-cylindrical cavity in the pump cover form.

The present invention is incorporated into the centrifugal pump structure of middle open type in the axial-flow pump, reduces the volume of pump, and the length of simplified structure, shortening rotating shaft improves reliability, be convenient to safeguard, and the corresponding height that reduces pump house.

Description of drawings

Fig. 1 is a main pseudosection of the present invention, Fig. 2 be the B-B of Fig. 1 to side view, Fig. 1 is that the A-A of Fig. 2 is to sectional view.Wherein geometrical symmetry line OO ' is the geometrical symmetry line of the delivery chamber of pump.

Specific implementation

As shown in Figure 1, the present invention mainly is made up of three parts, and promptly rotating axis component, the pump housing 1 and pump cover 6 are formed.Rotating axis component is meant the component such as bearing support of rotating shaft, supporting revolving shaft.Two suction pipes that are used to suck

liquid

10,12, two supporting foots 13 of discharge tube that are used for drain are arranged on the pump housing 1, the pump housing have for 1 li can hold impeller 4 and 4 ' two half-

cylindrical cavitys

9,9 '.Be cast with spiral down delivery chamber on the pump housing 1, diaphragm 7 ' link to each other with the pump housing 1, the plane at diaphragm 7 ' place is positioned on the geometrical symmetry line OO ', will descend delivery chamber be divided into two cavitys 11,11 '.

Pump cover have for 6 li can hold impeller 4 and 4 ' two half-cylindrical cavitys 9 ', 9, pump cover is cast with the spiral delivery chamber of going up for 6 li, diaphragm 7 links to each other with pump cover 6, and the plane at diaphragm 7 places is positioned on the geometrical symmetry line OO ', will go up delivery chamber be divided into two cavitys 5,5 '.

As shown in Figure 2, liquid is from suction pipe 10 suction pumps, outside discharge tube 12 blowdown pumps.Pump cover 6 is installed on the pump housing 1, and the delivery chamber that pump cover is 6 li is last delivery chamber, and the delivery chamber that the pump housing is 1 li is following delivery chamber, and pump cover 6 is installed on the pump housing 1, forms complete half spiral shell shape suction chamber and spirality delivery chamber, finishes the function of suction and drain.

Impeller 4 and 4 ' be installed in the rotating shaft 8 lays respectively in two cylindrical cavities that two half-cylindrical cavitys in the pump housing and the half-cylindrical cavity in the pump cover form.Impeller 4 and 4 ' the outlet positioned opposite, by the

diaphragm

7,7 in the middle of the cavity ' separate, forms two acting cavitys that make the liquid energy increase.The liquid that sucks from suction chamber obtains increasing in the blade effect downforce and the speed of the impeller that is rotating, and promptly energy obtains increasing, and from impeller 4 and 4 ' flow out to delivery chamber, is discharged to outside the pump by delivery chamber at last then.

Rotating shaft 8 is by the

bearing support

2 and 2 that is positioned at the pump housing 1 two ends ' support.Rotating axis component can be assembled separately.Can open pump cover 6 and take apart fixed bearing block 2,2 ' set screw nut just can take out rotating shaft.

, vertical single-stage horizontal with single-stage cantilever compared with multistage horizontal pump, and major advantage of the present invention is:

(1) under identical net positive suction head condition, can improve 1.4 times of rotating speeds, impeller diameter Dwindle 71%.

(2) under identical cavitation specific speed and speed conditions, can reduce net positive suction head 63%, the setting height(from bottom) of reduction pump reduces the earthwork evacuation amount.

(3) rotor bow is little, and amplitude of fluctuation is also little, and the shaft seal life-span is long, pump reliability height.

(4) do not tear suction or discharge tube open, just can hang in and hang out rotor, install and overhaul very convenient as long as open pump cover.

(5) axial force is offset automatically, and bearing life is long.

(6) compare with vertical pump, can significantly reduce the pump house height.

Claims

1, a kind of axial-flow pump, comprise the pump housing (1), pump cover (6), rotating shaft (8), two suction pipes (10), a discharge tube (12) are arranged on the pump housing (1), rotating shaft (8) is installed in the bearing support (2) that is positioned at the pump housing (1) two ends, on (2 '), it is characterized in that: have a diaphragm (7) that links to each other with pump cover (6), the plane at diaphragm (7) place to be positioned at that geometrical symmetry line (OO ') goes up in pump cover (6) lining and perpendicular with the axis of rotating shaft (8); There are a diaphragm (7 ') that links to each other with the pump housing (1), the plane at diaphragm (7 ') place to be positioned at that geometrical symmetry line (OO ') goes up in the pump housing (1) lining and perpendicular with the axis of rotating shaft (8); Diaphragm (7) is in the same plane with diaphragm (7 '); Delivery chamber be will go up by diaphragm (7) and two cavitys (5), (5 ') will be divided into, to descend delivery chamber to be divided into two cavitys (11), (11 ') by diaphragm (7 '), cavity (5), (5 ') form two spirality cavitys with cavity (11 '), (11) respectively;

2, axial-flow pump according to claim 1 is characterized in that: there are two half-cylindrical cavitys (9), (9 ') in the pump housing (1) lining, and cavity (9), (9 ') are symmetrically distributed in geometrical symmetry line (OO ') both sides; There are two half-cylindrical cavitys (3 '), (3) in pump cover (6) lining, and cavity (3 '), (3) are symmetrically distributed in geometrical symmetry line (OO ') both sides; Impeller (4), (4 ') are installed in the rotating shaft (8), lay respectively in the cylindrical cavity of cavity (3 '), (3) and cavity (9), (9 ') formation.