Axial flow pump bearing structure with reliable working performance
Through the combined design of spherical roller thrust bearings and self-aligning sleeves and spiral groove sealing, the problems of reduced sealing and imbalance of axial force under high temperature and high pressure are solved, and the stable operation and cost reduction of axial flow pump are achieved.
Patent Information
- Application Number
- CN202422094358.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The existing axial flow pump bearing structure cannot effectively balance the larger axial force, and the sealing performance gradually decreases under high temperature and high pressure, resulting in unstable operation of the axial flow pump, high production costs and inconvenient maintenance.
The spherical roller thrust bearing and self-aligning sleeve design is adopted, combined with thread positioning and spring seat structure, enhance the axial force transmission capability, and spiral grooves are set at the felt ring seal to improve sealing.
Effectively balance axial forces, reduce production costs, improve the working reliability and stability of axial flow pumps, facilitate disassembly, assembly and maintenance, and ensure long-term operation.
Smart Images
Figure CN223049064U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a bearing structure of an axial flow pump, in particular to an axial flow pump bearing structure with reliable working performance, which can effectively balance large axial forces, has reliable working performance, reduces production costs, is convenient for disassembly, installation and maintenance, and ensures the stable operation of the axial flow pump. Background Art
[0002] Axial flow pumps are characterized by large flow rates and low head, and are widely used in municipal engineering, drainage and irrigation, hydropower generation, petrochemical industry, aerospace and ships and other fields.
[0003] Figure 1 Fig. is a schematic diagram of a common bearing structure of an axial flow pump at present. Figure 2 For Figure 1 is a partial enlarged view at M in. In order to balance the axial force received by the existing horizontal axial flow pump, a thrust ball bearing 2' is arranged in the bearing bracket. However, the thrust ball bearing can only bear a small axial force and does not have a self-aligning function, and cannot automatically adapt to the deflection deformation of the shaft.
[0004] The installation shaft sleeve 1' of the thrust ball bearing and the shaft lack axial positioning on the right side. When the axial flow pump bears the axial force pointing to the driving end, the axial force cannot be effectively transmitted to the bearing. The axial force will pull the rotor to move axially to the left, resulting in contact between the impeller and the guide vane body, affecting the normal operation of the axial flow pump. Because it is an integral pump shaft, if a positioning shoulder is added to the shaft, a larger specification of round steel must be selected for processing, which will inevitably increase the processing amount of the shaft and production costs.
[0005] In addition, the dynamic and static contact surfaces between the bearing seat 6' and the shaft 14', and between the gland 7' and the shaft sleeve 1' are sealed with a felt ring 12'. When operating under high temperature, high pressure or high speed conditions, the sealing performance will gradually decrease over time, and it is difficult to ensure the effective sealing of the lubricating oil.
[0006] Therefore, in order to reduce production costs, ensure the reliability of the bearing working performance, and ensure the stable operation of the axial flow pump, it is necessary to optimize the bearing structure. Summary of the Utility Model
[0007] Aiming at the above problems, the main purpose of the utility model is to provide an axial flow pump bearing structure with reliable working performance, which can effectively balance large axial forces, has reliable working performance, reduces production costs, is convenient for disassembly, installation and maintenance, and ensures the stable operation of the axial flow pump.
[0008] The utility model solves the above technical problems through the following scheme: an axial flow pump bearing structure with reliable working performance, the axial flow pump bearing structure with reliable working performance includes: a shaft sleeve, a spherical roller thrust bearing, a spring seat, a spring, a bearing seat, a gland, a positioning plate and a connecting plate.
[0009] A positioning plate is provided on one side of the bushing. Threads are provided on the inner circle of the positioning plate, and the bushing is axially positioned by threaded connection with the shaft. The connecting plate is arranged in a horizontal split structure of upper and lower parts. After the positioning plate is installed, the upper and lower parts of the connecting plate are sleeved on the positioning plate, and a spherical roller thrust bearing with a self-aligning function is arranged between the bushing and the bearing seat.
[0010] A spring seat is arranged between the spherical roller thrust bearing and the bearing seat. A spring seat hole is provided on the spring seat for installing a spring; set screws are evenly distributed on the inner circle of the spring seat, and the set screws ensure the circumferential positioning of the spring seat.
[0011] In a specific embodiment of the present utility model, the upper and lower parts of the connecting plate are connected by bolts and nuts.
[0012] In a specific embodiment of the present utility model, the connecting plate is axially positioned by a groove provided on the bushing and circumferentially positioned by two positioning pins. The positioning pins are distributed perpendicular to the horizontal split surface.
[0013] In a specific embodiment of the present utility model, the positioning plate is locked by a lock nut, and the positioning plate is locked on the pump shaft.
[0014] In a specific embodiment of the present utility model, the compression spring is a cylindrical helical compression spring.
[0015] In a specific embodiment of the present utility model, the number of set screws is usually 3 to 6.
[0016] In a specific embodiment of the present utility model, an adjusting shim is arranged between the spherical roller thrust bearing and the bushing, and the thickness range of the adjusting shim is 3 to 6 mm.
[0017] In a specific embodiment of the present utility model, felt seals are provided on the dynamic and static contact surfaces between the bearing seat and the shaft, and between the gland and the bushing.
[0018] In a specific embodiment of the present utility model, spiral grooves are provided beside the felt seals.
[0019] In a specific embodiment of the present utility model, the cross-section of the spiral groove is semi-circular.
[0020] The positive and progressive effects of the present utility model are as follows: Compared with common similar technologies, the axial flow pump bearing structure with reliable working performance provided by the present utility model can effectively balance large axial forces, has reliable working performance, reduces production costs, is convenient for disassembly, installation, maintenance, and can ensure the long-term stable operation of the axial flow pump. Description of the Drawings
[0021] Figure 1It is a schematic diagram of the bearing structure of a common axial flow pump at present.
[0022] Figure 2 is Figure 1 the partial enlarged view at M in
[0023] Figure 3 It is a schematic diagram of the bearing structure of the axial flow pump proposed by the present utility model.
[0024] Figure 4 is Figure 3 the partial enlarged view at N in
[0025] Figure 5-1 It is a schematic diagram of the positioning plate in the present utility model.
[0026] Figure 5-2 is Figure 5-1 the C-C sectional view of
[0027] Figure 6-1 It is a schematic diagram of the connecting plate in the present utility model.
[0028] Figure 6-2 is Figure 6-1 the D-D sectional view of
[0029] Figure 7-1 It is a schematic diagram of the spring seat in the present utility model.
[0030] Figure 7-2 is Figure 7-1 the E-E sectional view of
[0031] The following are the names corresponding to the reference numerals in the present utility model:
[0032] Shaft sleeve 1, Spherical roller thrust bearing 2, Spring seat 3, Spring 4, Adjusting gasket 5, Bearing housing 6, gland 7, Positioning plate 8, Connecting plate 9, Locking nut 10, Positioning pin 11, Felt seal 12, Spiral groove 13, Groove 101. Specific embodiments
[0033] The following gives the preferred embodiments of the present utility model in conjunction with the drawings to illustrate the technical solutions of the present utility model in detail.
[0034] Figure 3 It is a schematic diagram of the bearing structure of the axial flow pump proposed by the present utility model, Figure 4 is Figure 3 the partial enlarged view at N in Figure 3-4As shown in the figure: The axial flow pump bearing structure with reliable working performance proposed by the present utility model includes: a shaft sleeve 1, a spherical roller thrust bearing 2, a spring seat 3, a spring 4, a bearing housing 6, a gland 7, a positioning plate 8, and a connecting plate 9. A positioning plate 8 is provided on one side of the shaft sleeve 1. Threads are provided on the inner circle of the positioning plate 8, and the shaft sleeve 1 is axially positioned by screwing it onto the shaft. The connecting plate 9 is arranged in a horizontally split structure in upper and lower parts. After the positioning plate 8 is installed, the upper and lower parts of the connecting plate 9 are sleeved on the positioning plate 8. A spherical roller thrust bearing 2 with a self-aligning function is arranged between the shaft sleeve 1 and the bearing housing 6. A spring seat 3 is arranged between the spherical roller thrust bearing 2 and the bearing housing 6, and a spring seat hole is provided on the spring seat 3 for installing the spring 4. Set screws are evenly distributed on the inner circle of the spring seat 3, and the set screws ensure the circumferential positioning of the spring seat. The compression spring in the present utility model is generally a cylindrical helical compression spring.
[0035] In the specific implementation process, the upper and lower parts of the connecting plate 9 are connected by bolts and nuts. The connecting plate 9 is axially positioned by a groove 101 provided on the shaft sleeve 1 and circumferentially positioned by two positioning pins 11. The positioning pins 11 are distributed perpendicular to the horizontal split surface. The positioning plate 8 is locked by a lock nut 10 and locked onto the pump shaft. An adjusting gasket 5 is arranged between the spherical roller thrust bearing and the shaft sleeve. Felt seals 12 are arranged on the dynamic and static contact surfaces between the bearing housing and the shaft, and between the gland and the shaft sleeve. A spiral groove 13 is arranged beside the felt seal, and the cross-section of the spiral groove 13 is semi-circular.
[0036] Figure 5-1 It is a schematic structural view of the positioning plate in the present utility model. Figure 5-2 For Figure 5-1 C-C sectional view. A positioning plate is arranged on the left side of the shaft sleeve. Threads are provided on the inner circle of the positioning plate, and the shaft sleeve is axially positioned by screwing it onto the shaft. Then a lock nut is arranged on the left side to lock the positioning plate.
[0037] Figure 6-1 It is a schematic structural view of the connecting plate in the present utility model. Figure 6-2 For Figure 6-1 D-D sectional view. The connecting plate is arranged in a horizontally split structure. After the positioning plate is installed, the upper and lower parts of the connecting plate are sleeved on the positioning plate, and the upper and lower parts are connected by bolts and nuts. The connecting plate is axially positioned by a groove provided on the shaft sleeve and circumferentially positioned by 2 positioning pins. The positioning pins are distributed perpendicular to the horizontal split surface.
[0038] Through the cooperation of surface A on the positioning plate and surface B on the connecting plate, without adding a positioning shoulder and without changing the existing structural layout, the axial and radial dimensions of the newly added parts can be minimized to the greatest extent, enabling the axial force to be effectively transmitted to the bearing and ensuring the normal operation of the axial flow pump.
[0039] Figure 7-1 This is a schematic structural view of the spring seat in the present utility model. Figure 7-2 It is Figure 7-1 the E-E cross-sectional view of Figure 4 、 Figure 7-1 、 7-2 as shown in
[0040] : A spring seat is arranged between the spherical roller thrust bearing and the bearing seat, and a spring seat hole is provided on the spring seat for installing a cylindrical helical compression spring. When the axial flow pump bears the axial force pointing to the driving end, the spherical roller thrust bearing can obtain the minimum load that can meet the normal operation by relying on the elastic force of the spring. Set screws are evenly distributed on the inner circle of the spring seat to ensure the circumferential positioning of the spring seat.
[0041] When the spring seat hole is worn out more and affects the normal operation, only the spring seat needs to be replaced. If the spring seat hole is directly set on the end face of the bearing seat, it will weaken the strength of the bearing seat, easily cause damage and deformation of the bearing seat, and requires frequent maintenance and replacement, increasing the maintenance cost.
[0042] As Figure 4 shown: An adjusting gasket is arranged between the spherical roller thrust bearing and the shaft sleeve to adjust the axial clearance of the bearing, compensate for wear, and ensure the reliability of the bearing operation. The thickness of the adjusting gasket is usually taken as 3 - 6 mm, and the specific dimensions can be adjusted according to actual requirements.
[0043] Spiral grooves are arranged beside the felt seal on the bearing seat and the gland. In the case of the failure of the felt seal, the sealing performance of the lubricating oil can be continuously ensured. The cross-section of the spiral groove is semi-circular, reducing the stress concentration near the dynamic and static contact surfaces.
[0044] Through the above design, the present utility model has the advantages of stable performance. The present utility model can effectively balance a large axial force, has reliable working performance, reduces production costs, is convenient for disassembly, installation and maintenance, and can ensure the long-term stable operation of the axial flow pump.
[0045] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. An axial flow pump bearing structure with reliable working performance, characterized by: The axial flow pump bearing structure with reliable working performance comprises: a shaft sleeve, a spherical roller thrust bearing, a spring seat, a spring, a bearing seat, a gland, a positioning plate and a connecting plate; A positioning plate is arranged on one side of the sleeve, and a thread is arranged on the inner circle of the positioning plate. The sleeve is axially positioned through the threaded connection with the shaft; the connecting plate is arranged into a horizontally split structure of upper and lower parts. After the positioning plate is installed, the upper and lower parts of the connecting plate are put on the positioning plate. A spherical roller thrust bearing with a self-aligning function is arranged between the shaft sleeve and the bearing seat; A spring seat is arranged between the spherical roller thrust bearing and the bearing seat, and a spring seat hole is arranged on the spring seat for installing a spring; set screws are evenly distributed on the inner circle of the spring seat, and the set screws ensure the circumferential positioning of the spring seat.
2. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: The upper and lower parts of the connecting plate are connected by bolts and nuts.
3. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: The connecting plate is positioned axially by a circle of grooves arranged on the shaft sleeve, and is positioned circumferentially by two positioning pins, and the positioning pins are distributed in a vertical direction to the horizontal split surface.
4. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: The locating plate is locked by a locking nut to lock the locating plate onto the pump shaft.
5. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: The compression spring is a cylindrical helical compression spring.
6. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: The number of set screws is usually 3 to 6.
7. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: An adjusting gasket is arranged between the spherical roller thrust bearing and the shaft sleeve, and the thickness of the adjusting gasket ranges from 3 to 6 mm.
8. The axial flow pump bearing structure with reliable working performance according to claim 1 is characterized in that: Felt ring seals are arranged on the dynamic and static contact surfaces between the bearing seat and the shaft, and between the gland and the sleeve.
9. The axial flow pump bearing structure with reliable working performance according to claim 8 is characterized in that: A spiral groove is provided next to the felt seal.
10. The axial flow pump bearing structure with reliable working performance according to claim 9, characterized in that: The cross section of the spiral groove is semicircular.