CN219242292U

CN219242292U - Middle section structure of impeller axial force-free multi-section centrifugal pump

Info

Publication number: CN219242292U
Application number: CN202223264015.8U
Authority: CN
Inventors: 赵景权; 杨向伟
Original assignee: Xingcheng City Pump Manufacture Co ltd
Current assignee: Xingcheng City Pump Manufacture Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-06-23
Anticipated expiration: 2032-12-07

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a middle section structure of a multistage centrifugal pump with an impeller without axial force. The back of impeller is provided with the bulge loop with positive water inlet ring coaxial same diameter, be provided with first sealing ring between the shaft hole inner wall in impeller's water inlet ring and the water pump middle section, the first sealing ring outside contacts with the shaft hole inner wall in water pump middle section, there is the clearance between first sealing ring inboard and the water inlet ring, be provided with the second sealing ring corresponding with first sealing ring between bulge loop periphery and the stator, the second sealing ring outside contacts with the stator, there is the clearance between second sealing ring inboard and the bulge loop, first fixed ring groove has been seted up respectively on the opposite face of first sealing ring and second sealing ring and be close to one side of main shaft, be provided with first self-lubricating bush in the fixed ring groove, first self-lubricating bush outside contacts with first sealing ring and second sealing ring respectively, first self-lubricating bush inboard contacts with water inlet ring and bulge loop respectively. The structure can replace a balancing device, and the service life of the centrifugal pump is prolonged.

Description

Middle section structure of impeller axial force-free multi-section centrifugal pump

Technical Field

The utility model relates to the technical field of centrifugal pumps, in particular to a middle section structure of a multistage centrifugal pump with an impeller without axial force.

Background

Currently, multistage centrifugal pumps used in various applications generate large axial forces during use. Because axial force is generated on the impeller during the operation of the impeller, especially, the more the number of impellers of the multistage centrifugal pump is, the more serious the axial force is generated. To eliminate the axial forces, balancing drums or balancing disk devices are typically used to balance, and sometimes bearings are used to carry the residual axial forces. The bearing is easy to damage when bearing is subjected to larger axial force, and the balancing device is easy to wear. Other rotor parts are worn, so that the normal service life and the working efficiency of the pump are affected, and equipment maintenance cost of a user is increased due to frequent replacement of wear parts; in addition, when the rotor in the centrifugal pump is unbalanced, the water pump can vibrate, and the vibration can cause unstable integral equipment and damage to the bearing; the centrifugal pump impeller adopts traditional clearance seal to lead to leaking, reduces water pump efficiency.

Disclosure of Invention

The present utility model is directed to solving the above-described problems, and thereby providing a middle section structure of a multistage centrifugal pump having no axial force of an impeller capable of eliminating axial force.

The utility model solves the problems, and adopts the following technical scheme:

the utility model provides a multistage centrifugal pump's of impeller no axial force middle section structure, including main shaft and water pump middle section, the main shaft middle part spacer sleeve is equipped with multistage impeller, the cover is equipped with the axle sleeve on the main shaft and be located between the adjacent impeller, water pump middle section internal fixation has the stator with impeller matched with, the back of impeller is provided with the bulge loop with positive water inlet ring coaxial same diameter, be provided with first sealing ring between the shaft hole inner wall of impeller's water inlet ring and water pump middle section, the first sealing ring outside contacts with the shaft hole inner wall of water pump middle section, there is the clearance between first sealing ring inboard and the water inlet ring, be provided with the second sealing ring corresponding with first sealing ring between bulge loop periphery and the stator, the second sealing ring outside contacts with the stator, there is the clearance between second sealing ring inboard and the bulge loop, first self-lubricating bush is provided with in the bulge loop respectively on the opposite face of first sealing ring and the side that is close to the main shaft, first self-lubricating bush outside contacts with first sealing ring and second sealing ring respectively.

Compared with the prior art, the utility model adopting the technical scheme has the outstanding characteristics that:

through the same-size first self-lubricating bearing bush support of impeller both sides, can reduce the rotor deflection, reduce the water pump vibration, no clearance between the both sides of first self-lubricating bearing bush and impeller and the sealing ring can not lead to revealing, has improved water pump efficiency, and impeller both sides pressure is the same, and the projected area of pressure effect is the same, has not the axial force that produces because of pressure, uses this structure can replace balancing unit, has increased centrifugal pump's life.

Preferably, the utility model further adopts the technical scheme that:

a guide vane sleeve is arranged between the shaft sleeve and the inner wall of the guide vane shaft hole, the outer side of the guide vane sleeve is contacted with the inner wall of the guide vane shaft hole, a gap exists between the inner side of the guide vane sleeve and the shaft sleeve, a second fixing ring groove is formed in the position, close to the shaft sleeve, of the guide vane sleeve and the adjacent side of the next-stage impeller, a second self-lubricating bearing bush is arranged in the second fixing ring groove, the outer side of the second self-lubricating bearing bush is contacted with the second fixing ring groove, and the inner side of the second self-lubricating bearing bush is contacted with the shaft sleeve.

Drawings

FIG. 1 is a schematic view of the overall structure of a centrifugal pump employing the structure of the present utility model;

FIG. 2 is a schematic view of the structure of FIG. 1A in a partially enlarged manner;

marked in the figure as: the self-lubricating device comprises a main shaft 1, a water pump middle section 2, an impeller 3, a water inlet ring 301, a convex ring 302, a shaft sleeve 4, guide vanes 5, a first sealing ring 6, a second sealing ring 7, a first self-lubricating bearing bush 8, a guide vane sleeve 9 and a second self-lubricating bearing bush 10.

Detailed Description

The utility model is further described below in connection with the following examples which are provided for the purpose of better understanding of the present utility model and are, therefore, not to be construed as limiting the scope of the utility model.

The utility model provides a multistage centrifugal pump's that impeller does not have axial force middle section structure, including main shaft 1 and water pump middle section 2, main shaft 1 middle part spacer sleeve is equipped with multistage impeller 3, the cover is equipped with axle sleeve 4 on the main shaft 1 and be located between the adjacent impeller 3, water pump middle section 2 internal fixation has with impeller 3 matched with stator vane 5, the back of impeller 3 is provided with the bulge loop 302 with positive water inlet ring 301 coaxial same diameter, be provided with first sealing ring 6 between the water inlet ring 301 of impeller 1 and the shaft hole inner wall of water pump middle section 2, the outside of first sealing ring 6 contacts with the shaft hole inner wall of water pump middle section 2, there is the clearance between the inside of first sealing ring 6 and water inlet ring 301, be provided with the second sealing ring 7 corresponding with first sealing ring 6 between bulge loop 302 periphery and stator vane 5, there is the clearance between the inside of second sealing ring 7 and bulge loop 302, the sealing ring on the opposite face of first sealing ring 6 and second sealing ring 7 and be close to the one side of main shaft 1 respectively set up first fixed annular, be provided with first self-lubricating 8 in the fixed annular, first self-lubricating 8 outside and first self-lubricating 8 and second sealing ring 301 contact with first self-lubricating ring respectively, self-lubricating 8 and first self-lubricating annular contact with first bearing bush 301.

Be provided with stator cover 9 between axle sleeve 4 and the guide vane 5 shaft hole inner wall, stator cover 9 outside contacts with guide vane 5 shaft hole inner wall, there is the clearance between stator cover 9 inboard and the axle sleeve 4, the second fixed ring groove has been seted up to the adjacent side of stator cover 9 on being close to axle sleeve 4 and with next stage impeller 3, be provided with second self-lubricating bush 10 in the second fixed ring groove, the second self-lubricating bush 10 outside contacts with the second fixed ring groove, the inboard of second self-lubricating bush 10 contacts with axle sleeve 4, support rotor structure through second self-lubricating bush 10, reduce rotor deflection, reduce the water pump vibration, the both sides of second self-lubricating bush 10 and the clearance between stator cover 9 and the axle sleeve 4, can not lead to revealing, water pump efficiency has been improved.

The self-lubricating bearing bush is made of self-lubricating materials such as graphite, molybdenum disulfide, polytetrafluoroethylene and the like.

The second self-lubricating bearing bush and the first self-lubricating bearing bushes with the same size at two sides of the impeller are supported together, so that the deflection of a rotor can be reduced, and the vibration of a water pump can be reduced; no gap exists between the two sides of the second self-lubricating bearing bush and the guide vane sleeve as well as between the two sides of the first self-lubricating bearing bush and the impeller and the sealing ring, so that leakage is avoided, and the efficiency of the water pump is improved; the pressure on two sides of the impeller is the same, the projection area of the pressure effect is the same, the axial force generated by the pressure is avoided, the balance device can be replaced by the structure, and the service life of the centrifugal pump is prolonged.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the scope of the claims, but rather to cover all equivalent modifications within the scope of the present utility model as defined by the appended claims.

Claims

1. The utility model provides a multistage centrifugal pump's of impeller no axial force middle section structure, includes main shaft and water pump middle section, and the multistage impeller is equipped with to main shaft middle part spacer sleeve, and the cover that just is located between the adjacent impeller is equipped with the axle sleeve on the main shaft, water pump middle section internal fixation have with impeller matched with stator, its characterized in that: the back of impeller is provided with the bulge loop with positive water inlet ring coaxial same diameter, be provided with first sealing ring between the shaft hole inner wall in impeller's water inlet ring and the water pump middle section, the first sealing ring outside contacts with the shaft hole inner wall in water pump middle section, there is the clearance between first sealing ring inboard and the water inlet ring, be provided with the second sealing ring corresponding with first sealing ring between bulge loop periphery and the stator, the second sealing ring outside contacts with the stator, there is the clearance between second sealing ring inboard and the bulge loop, first fixed ring groove has been seted up respectively on the opposite face of first sealing ring and second sealing ring and be close to one side of main shaft, be provided with first self-lubricating bush in the fixed ring groove, first self-lubricating bush outside contacts with first sealing ring and second sealing ring respectively, first self-lubricating bush inboard contacts with water inlet ring and bulge loop respectively.

2. The impeller axial force free midsection construction of a multistage centrifugal pump of claim 1 wherein: a guide vane sleeve is arranged between the shaft sleeve and the inner wall of the guide vane shaft hole, the outer side of the guide vane sleeve is contacted with the inner wall of the guide vane shaft hole, a gap exists between the inner side of the guide vane sleeve and the shaft sleeve, a second fixing ring groove is formed in the position, close to the shaft sleeve, of the guide vane sleeve and the adjacent side of the next-stage impeller, a second self-lubricating bearing bush is arranged in the second fixing ring groove, the outer side of the second self-lubricating bearing bush is contacted with the second fixing ring groove, and the inner side of the second self-lubricating bearing bush is contacted with the shaft sleeve.