CN202073846U

CN202073846U - Pump shaft balancing device

Info

Publication number: CN202073846U
Application number: CN2011201172810U
Authority: CN
Inventors: 吴永旭; 彭学斌; 张永泉; 姜娟
Original assignee: Shanghai East Pump Group Co Ltd
Current assignee: Shanghai East Pump Group Co Ltd
Priority date: 2011-04-20
Filing date: 2011-04-20
Publication date: 2011-12-14
Anticipated expiration: 2021-04-20

Abstract

A pump shaft balancing device comprises a balancing plate and a balancing disc. The edge of the balancing plate is provided with a throttle flange for internally enclosing the balancing disc; the throttle flange is in clearance fit with an external circle of the balancing disc; and an inside contact surface of the balancing disc is an inclined surface. As the edge of the balancing plate of the pump shaft balancing device is provided with the throttle flange, a throttle damping function can be realized, and axial oscillation of a pump shaft caused by rapid pressure change at two ends of the balancing disc due to axial movement of the balancing disc is avoided. After the inside contact surface of the balancing disc is changed into the inclined surface, when the balancing disc contacts with the balancing plate due to change of operating conditions, high pressure can be formed inside and outside the balancing disc, balancing force is increased, contact friction time of the balancing disc and the balancing plate is shortened, and abrasion of the balancing disc and the balancing plate is relieved.

Description

The pump shaft Equilibrator

Technical field

The utility model relates to a kind of pump shaft Equilibrator.

Background technique

In the design of multistage centrifugal pump,, all adopt the Equilibrator of forming by Balance disc, balance plate in order to overcome the axial force of the sensing suction port end that produces in the pump operation.Balance disc carries out work by leaking pressure reduction, and not revealing does not just have equilibrant, but must assurance minimal leak volume production give birth to maximum equilibrant, and pump could efficiently move.Its working principle is: as shown in Figure 1, the B chamber links to each other with the water outlet high pressure water, and the A chamber links to each other with the water intake low-pressure water, because the pressure difference at Balance disc 2 two ends is pointed to the axial force opposite direction that pump operation produces, so make the axial force of pump obtain balance.During pump operation, the B cavity pressure raises, because the B cavity pressure is greater than the A chamber, so Balance disc 2 drives pump shaft 3 and moves to the Q direction, Balance disc 2 and balance plate 1 leave and form the gap, and high pressure water leaks to the A chamber by this gap, and the A cavity pressure increases, when the pressure difference that rises to Balance disc 2 two ends when pressure just in time equaled axial force that pump operation produces, pump rotor reached state of equilibrium.Because the operating mode instability of pump operation, the axial force of its generation also change at any time, so Balance disc also drives rotor and produces at any time and move axially, and reaches state of equilibrium automatically.Because when pump startup or operating conditions change suddenly, Balance disc 2 produces with balance plate 1 and contacts, its surface of contact 21 is the plane, the area of contact is bigger, because axial force is very big, Balance disc and balance plate produce serious wearing and tearing, leakage rate increases, cause the equilibrant deficiency, finally cause Balance disc and balance plate to kill, pump can't be moved.Because general Equilibrator do not have the throttling measure in the Balance disc back, when Balance disc moves to the Q direction, when the gap became big suddenly, leakage rate increased, and Balance disc two ends pressure reduction reduces, and balanced action is corresponding to die down.

The model utility content

In order to guarantee the smooth running of pump, improve the working life of Balance disc and the safe and highly efficient operation of pump, the utility model provides a kind of pump shaft Equilibrator.

The utility model is that the technological scheme that its technical problem of solution is adopted is,

The pump shaft Equilibrator comprises balance plate and Balance disc, and described balance plate edge is provided with the throttling chimb, and in this throttling chimb was enclosed in Balance disc, throttling chimb and Balance disc cylindrical were Spielpassung, and the inboard surface of contact of Balance disc is the inclined-plane.

Further, the gap between described throttling chimb and the Balance disc cylindrical is 0.2mm～0.4mm.

Further, the angle of inclination of described surface of contact is 3 °～5 °.

The beneficial effects of the utility model are, this pump shaft Equilibrator is provided with the throttling chimb at the balance plate edge, can play the throttling damping function, avoided because Balance disc moves axially the Balance disc pressure at two ends that causes and changes rapidly, make pump shaft produce axial oscillation, after the inboard surface of contact of Balance disc changes the inclined-plane into, when operating conditions changes when Balance disc is contacted with balance plate, the outside still can form high pressure in the Balance disc, increased equilibrant, the contact friction time of Balance disc and balance plate is shortened, alleviated wearing and tearing each other.

Description of drawings

Fig. 1 is the user mode schematic representation of existing balance plate, Balance disc;

Fig. 2 is the pump shaft balance device structure schematic representation that the utility model proposes;

Fig. 3 is the user mode schematic representation of pump shaft Equilibrator.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose with effect is easy to understand, below in conjunction with illustrating and specific embodiment, further set forth the utility model.

As Fig. 2, shown in Figure 3, the pump shaft Equilibrator that the utility model proposes comprises balance plate 100 and Balance disc 200, Balance disc 200 is arranged on the pump shaft 300, described balance plate frontside edge is provided with throttling chimb 110, in this throttling chimb 110 is enclosed in Balance disc 200, throttling chimb 110 is a Spielpassung with Balance disc 200 cylindricals, and the inboard surface of contact 210 of Balance disc 200 is the inclined-plane.

In an embodiment of the present utility model, the gap between described throttling chimb 110 and Balance disc 200 cylindricals is 0.2mm～0.4mm.

In an embodiment of the present utility model, the angle of inclination of described surface of contact 210 is 3 °～5 °.

This pump shaft Equilibrator is provided with the throttling chimb at the balance plate edge, can play the throttling damping function, avoided because Balance disc moves axially the Balance disc pressure at two ends that causes and changes rapidly, the axial oscillation that pump shaft is produced after the inboard surface of contact of Balance disc changes the inclined-plane into, makes Balance disc contact with balance plate when operating conditions changes, the outside still can form high pressure in the Balance disc, increase equilibrant, the contact friction time of Balance disc and balance plate is shortened, alleviated wearing and tearing each other.

More than show and described basic principle of the present utility model, major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. the pump shaft Equilibrator comprises balance plate and Balance disc, it is characterized in that, described balance plate edge is provided with the throttling chimb, and in this throttling chimb was enclosed in Balance disc, throttling chimb and Balance disc cylindrical were Spielpassung, and the inboard surface of contact of Balance disc is the inclined-plane.

2. pump shaft Equilibrator according to claim 1 is characterized in that, the gap between described throttling chimb and the Balance disc cylindrical is 0.2mm～0.4mm.

3. pump shaft Equilibrator according to claim 1 is characterized in that, the angle of inclination of described surface of contact is 3 °～5 °.