Slurry pump impeller assembly with balance hole structure
By setting a balance hole on the impeller shaft of the slurry pump, the space inside the sealing ring of the impeller rear cover plate and the impeller import is connected, the problem of leakage and impact of the balance hole of the impeller of the traditional slurry pump is solved, and the operation stability of the slurry pump is improved. performance.
Patent Information
- Application Number
- CN202421208763.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-30
AI Technical Summary
The impeller balance hole of the traditional slurry pump is set at the impeller hub, causing the balance hole leakage flow and the main liquid flow to impact, destroying the normal state of the liquid flow, and the balance effect is poor, affecting the performance of the slurry pump.
A balance hole is set on the impeller shaft, and through the communication between the shaft core hole and the through hole, the space in the sealing ring of the impeller rear cover plate is connected to the low-pressure area of the impeller inlet, avoiding leakage and improving the axial force balance effect.
The space in the sealing ring of the impeller rear cover plate is smoothly connected with the impeller inlet, reducing the bearing thrust load, and improving the operating stability and performance of the slurry pump.
Smart Images
Figure CN222334081U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of slurry pumps, and in particular relates to a slurry pump impeller component with an axial force balancing hole arranged on an impeller shaft. Background Art
[0002] Slurry pump is a kind of machine that increases the energy of solid-liquid mixed medium by centrifugal force (rotation of pump impeller), and converts electrical energy into kinetic energy and potential energy of the medium. It is mainly applicable to industries such as mining, power plants, dredging, metallurgy, chemical industry, building materials and petroleum. Its axial force balance hole refers to a number of small holes (balance holes) evenly arranged on the rear cover plate of the impeller near the hub, and a sealing ring is attached to the rear cover plate, the diameter of which is roughly equal to the diameter of the sealing ring of the suction port, and the total area of the balance holes should be 4 to 5 times greater than the gap area of the sealing ring of the rear cover plate of the impeller. Due to the resistance loss generated when the liquid flows through the sealing ring of the rear cover plate, and the role of the balance hole in communication with the impeller inlet, the pressure inside the sealing ring of the rear cover plate is basically consistent with the impeller inlet pressure, thereby balancing most of the axial force.
[0003] However, the balancing hole of the traditional slurry pump impeller is set at the impeller hub, which means that the balancing hole can only be located between the impeller inlet blades. The leakage flow through the balancing hole impacts the main liquid flow entering the impeller, destroying the normal flow state of the main liquid flow and reducing the performance of the slurry pump. In addition, the pressure of the main liquid flow increases under the action of the impeller inlet blades. When it flows through the balancing hole again, the axial force balancing effect of the balancing hole will deteriorate. Utility Model Content
[0004] The utility model aims to provide a slurry pump impeller with a balancing hole structure with better balancing effect, so as to solve the technical problems that the balancing hole of the existing slurry pump impeller not only impacts the main liquid flow of the impeller flow channel when leakage occurs, but also has poor balancing effect.
[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:
[0006] A slurry pump impeller assembly with a balancing hole structure comprises an impeller shaft, a corresponding impeller is arranged on the impeller shaft, the two are detachably fixedly connected, a balancing hole is arranged on the impeller shaft for connecting the front and rear sides of the impeller, the balancing hole comprises an axial hole and a through hole which are connected to each other, wherein the axial hole is an opening at the front end of the impeller shaft along its axis toward the inside, the axial hole is open toward the front end of the impeller shaft, and a through hole which is connected to the outside is arranged on the side wall at the bottom of the axial hole.
[0007] Furthermore, the impeller includes a front cover plate and a rear cover plate which correspond to each other and are fixedly connected, and a plurality of flow channels are evenly distributed between the two in a circumferential direction. An impeller inlet connected to the flow channel is provided at the center of the front side of the front cover plate, and the other end of the flow channel on the side wall between the front cover plate and the rear cover plate is an impeller outlet. A mounting hole corresponding to the impeller shaft is provided at the center of the rear cover plate, and a sealing ring is provided on the rear side surface of the rear cover plate.
[0008] Furthermore, a pin hole corresponding to the impeller mounting hole is provided on the outer wall of the impeller shaft, and the two are positioned and installed by installing a corresponding positioning pin in the pin hole and cooperating with the mounting hole. The front end of the impeller shaft passes through the impeller mounting hole from the rear side of the rear cover plate to the front side thereof, and a corresponding positioning nut is provided at the front end of the impeller shaft, and a sealing ring surrounds the outer ring of the impeller shaft on the rear side of the rear cover plate.
[0009] Furthermore, the positioning nut is provided with a through hole corresponding to the axial center hole, and the axial center hole is connected to the impeller inlet through the through hole.
[0010] Furthermore, the plurality of holes are evenly distributed on the side wall of the impeller shaft at the bottom of the axial hole in a circumferential direction, the holes are located between the rear side of the impeller rear cover plate and the rear end of the sealing ring, and the axial hole is connected to the inner ring space of the sealing ring through the holes.
[0011] Furthermore, a plurality of circles of warp holes are arranged at the bottom end of the axial hole, and the warp holes of two adjacent circles are arranged alternately.
[0012] Furthermore, the number of the warp holes in each circle is no more than three, the axis of the axial hole is located on the axis of the impeller shaft, and the warp holes and the axial hole are perpendicular to each other.
[0013] The utility model discloses a slurry pump impeller assembly with a balancing hole structure, which avoids mutual impact with mainstream liquid caused by leakage of liquid through the balancing hole, and truly realizes the connection between the space inside the sealing ring of the impeller rear cover plate and the low-pressure zone of the impeller inlet, so that the connection and fusion of liquid between the two are smoother, thereby improving the stability of the operation of the slurry pump, reducing the thrust load of its bearing, making the axial balance of the impeller shaft better during operation, and having less influence on the overall performance of the slurry pump during operation, thereby improving the operating performance of the slurry pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the utility model;
[0015] Figure 2 For this utility model Figure 1 Schematic diagram of the structure of the impeller shaft;
[0016] Figure 3 For the utility model Figure 2 Schematic diagram of the structure in AA direction;
[0017] Figure 4 For the utility model Figure 2 Structural diagram of BB direction;
[0018] Explanation of markings in the figure: 1. impeller shaft; 11. locating pin; 2. impeller; 21. front cover; 22. rear cover; 23. flow channel; 24. impeller inlet; 25. impeller outlet; 26. sealing ring; 3. balancing hole; 31. axial hole; 32. through hole; 4. locating nut; 41. through hole. DETAILED DESCRIPTION
[0019] In order to better understand the purpose, structure and function of the utility model, the structure of the balancing hole 3 of the impeller of a slurry pump of the utility model is further described in detail below with reference to the accompanying drawings.
[0020] like Figure 1-4 As shown, the utility model of the slurry pump impeller assembly with a balancing hole structure includes an impeller shaft 1, which is installed at the axis center of the corresponding impeller 2 when in use, and the two are detachably fixedly connected. A corresponding balancing hole 3 is provided on the impeller shaft 1, and the balancing hole 3 connects the front low-pressure area of the impeller 2 with the rear side thereof, so that the axial force of the impeller 2 is more balanced.
[0021] The impeller 2 includes a front cover plate 21 and a rear cover plate 22 corresponding to each other, which are fixedly connected. A plurality of flow channels 23 are evenly distributed around the circumference between the front cover plate 21 and the rear cover plate 22. The blades of the impeller 2 are spaced apart between two adjacent flow channels 23. An opening communicating with the flow channel 23 is provided at the front center of the front cover plate 21, which is the impeller inlet 24. The other end opening of the flow channel 23 is provided on the side wall between the front cover plate 21 and the rear cover plate 22, which is the impeller outlet 25. When in use, the impeller 2 The inlet is a low-pressure area. Under its action, the pressure at the outlet is higher than that at the inlet, which is a high-pressure area. A mounting hole corresponding to the impeller shaft 1 is provided at the center of the rear cover plate 22. The impeller 2 is fixedly installed with the corresponding impeller shaft 1 through the mounting hole of the rear cover plate 22. A corresponding sealing ring 26 is provided on the rear side surface of the rear cover plate 22. The sealing ring 26 surrounds the outer ring of the impeller shaft 1 on the rear side of the rear cover plate 22. The sealing ring 26 generates resistance to the liquid flow passing through, thereby reducing the pressure after it flows into the sealing ring 26.
[0022] The axis of the impeller shaft 1 and the axis of the impeller 2 are on the same axis. A pin hole corresponding to the mounting hole of the impeller 2 is provided on the outer wall of the impeller shaft 1. When the two are installed correspondingly, the positioning installation between the two is achieved by installing a corresponding locating pin 11 in the pin hole and cooperating with the mounting hole. During installation, the front end of the impeller shaft 1 passes through the mounting hole from the rear side of the rear cover plate 22 of the impeller 2 to its front side, and the front end of the impeller shaft 1 passes through the front side of the rear cover plate 22. A corresponding positioning nut 4 is provided at the front end of the impeller shaft 1, and its axis coincides with the axis of the impeller shaft 1. The positioning nut 4 and the impeller shaft 1 are detachably fixedly connected. In this embodiment, the two are fixedly connected by corresponding threads, and the impeller shaft 1 and the impeller 2 are correspondingly installed together by cooperating with the positioning nut 4 and the locating pin 11.
[0023] The balancing hole 3 is arranged on the impeller shaft 1, and includes an axial hole 31 and a through hole 32, which are interconnected. A hole is opened at the front end of the impeller shaft 1 along its axial direction to the inside thereof, and this hole is the axial hole 31. The axial hole 31 is provided with an opening at the front end of the impeller shaft 1, and a plurality of through holes 32 are provided at the bottom of the axial hole 31. The plurality of through holes 32 are evenly distributed on the side wall of the impeller shaft 1 at the bottom of the axial hole 31 around the circumferential direction, and the through holes 32 are connected at the bottom of the axial hole 31 with the outside of the side wall of the impeller shaft 1. In this embodiment, the through holes 32 are perpendicular to the axial hole 31, and the through holes 32 are located on the side wall of the impeller shaft 1 outside the rear cover plate 22 of the impeller 2, and are located in the inner ring of the sealing ring 26 between the rear side surface of the rear cover plate 22 and the rear end of the sealing ring 26. The axial hole 31 is connected with the inner ring space of the sealing ring 26 through the through holes 32.
[0024] The positioning nut 4 is provided with a through hole 41 , which is arranged at the axis of the positioning nut 4 and corresponds to the axis hole 31 . The axis hole 31 is connected to the impeller inlet 24 through the through hole 41 .
[0025] Furthermore, an end face opening will weaken the strength of the impeller shaft 1, so a plurality of circles of holes 32 are provided at the bottom end of the axial hole 31, and each circle of holes 32 is evenly distributed around the circumferential direction, and two adjacent circles of holes 32 are arranged in a staggered manner. In this embodiment, two circles of holes 32 are provided to avoid a reduction in the strength of the impeller shaft 1.
[0026] Furthermore, two to three holes 32 are evenly distributed around the circumference of each circle. In this embodiment, three holes 32 are evenly distributed on each circle. The holes 32 of two adjacent circles are staggered. In this embodiment, the two circles of holes 32 are rotated 180 degrees to correspond to each other.
[0027] During operation, as the impeller shaft 1 rotates, the main liquid flow enters the impeller 2 from the low-pressure area of the impeller inlet 24 under the action of the impeller 2, is pressurized, and is discharged from the impeller outlet 25. At this time, part of the liquid behind the rear cover plate 22 of the impeller 2 flows through the sealing ring 26 to enter its inner ring after being blocked by the pressure. The liquid in the inner ring of the sealing ring 26 flows through the balancing hole 3 and, in cooperation with the through hole 41, is discharged from the front end of the impeller shaft 1 into the inlet of the impeller 2, so that the liquid flow pressure in the sealing ring 26 is basically consistent with the pressure in the low-pressure area at the impeller inlet 24, thereby achieving the purpose of balancing the axial force of the impeller shaft 1, thereby achieving the balance of the axial force of the impeller shaft 1.
[0028] The slurry pump impeller assembly with a balancing hole structure of the utility model sets the balancing hole 3 on the main shaft of the impeller 2. Through the cooperation of the balancing hole 3 and the through hole 41, the impact of the leakage flow of the balancing hole 3 on the flow channel 23 of the impeller 2 is completely avoided, and the connection between the space inside the sealing ring 26 of the rear cover plate 22 of the impeller 2 and the low-pressure area of the impeller inlet 24 is truly realized, thereby improving the effect of axial force balance, reducing the thrust load of the slurry pump bearing, and improving the operating stability of the pump group. In this process, it is avoided that the main liquid flow is restarted, so that it will not affect the performance of the slurry pump, and the performance of the slurry pump is better.
[0029] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.
Claims
1. A slurry pump impeller assembly with a balancing hole structure, characterized in that: The invention comprises an impeller shaft (1), a corresponding impeller (2) being arranged on the impeller shaft (1), the two being detachably fixedly connected, a balancing hole (3) being arranged on the impeller shaft (1) for connecting the front and rear sides of the impeller (2), the balancing hole (3) comprising an axial hole (31) and a through hole (32) being connected to each other, wherein the axial hole (31) is an opening extending from the front end of the impeller shaft (1) along its axis toward the inside thereof, the axial hole (31) is open in the direction of the front end of the impeller shaft (1), and a through hole (32) connected to the outside is arranged on the side wall at the bottom of the axial hole (31).
2. The slurry pump impeller assembly with a balancing hole structure according to claim 1, characterized in that: The impeller (2) comprises a front cover plate (21) and a rear cover plate (22) which correspond to each other and are fixedly connected, and a plurality of flow channels (23) are evenly distributed between the two in a circumferential direction; an impeller inlet (24) connected to the flow channel (23) is provided at the center of the front side of the front cover plate (21); the other end of the flow channel (23) on the side wall between the front cover plate (21) and the rear cover plate (22) is an impeller outlet (25); a mounting hole corresponding to the impeller shaft (1) is provided at the center of the rear cover plate (22); and a sealing ring (26) is provided on the rear side surface of the rear cover plate (22).
3. The slurry pump impeller assembly with a balancing hole structure according to claim 2, characterized in that: The outer wall of the impeller shaft (1) is provided with a pin hole corresponding to the impeller (2) mounting hole, and the two are positioned and mounted by installing a corresponding positioning pin (11) in the pin hole and cooperating with the mounting hole. The front end of the impeller shaft (1) passes through the impeller (2) mounting hole from the rear side of the rear cover plate (22) toward the front side thereof, and a corresponding positioning nut (4) is provided at the front end of the impeller shaft (1). A sealing ring (26) surrounds the outer ring of the impeller shaft (1) at the rear side of the rear cover plate (22).
4. The slurry pump impeller assembly with a balancing hole structure according to claim 3, characterized in that: The positioning nut (4) is provided with a through hole (41) corresponding to the axial hole (31), and the axial hole (31) is connected to the impeller inlet (24) through the through hole (41).
5. The slurry pump impeller assembly with a balancing hole structure according to claim 3, characterized in that: The plurality of through holes (32) are evenly distributed in a circumferential direction on the side wall of the impeller shaft (1) at the bottom of the axial hole (31); the through holes (32) are located between the rear side surface of the rear cover plate (22) of the impeller (2) and the rear end of the sealing ring (26); the axial hole (31) is connected to the inner ring space of the sealing ring (26) through the through holes (32).
6. The slurry pump impeller assembly with a balancing hole structure according to claim 5, characterized in that: A plurality of circles of through holes (32) are arranged at the bottom end of the axial center hole (31), and the through holes (32) of two adjacent circles are arranged in a staggered manner.
7. The slurry pump impeller assembly with a balancing hole structure according to claim 6, characterized in that: The number of the through holes (32) per circle is no more than three, the axis of the axial hole (31) is located on the axis of the impeller shaft (1), and the through holes (32) and the axial hole (31) are perpendicular to each other.