Bearing structure of submersible pump for well
By adopting a spherical contact design and limiting structure between ceramic bearings and elastic sleeves in well submersible pumps, the problems of bearing coaxiality and perpendicularity are solved, extending the service life of well submersible pumps and reducing wear and noise.
Patent Information
- Application Number
- CN202520779405.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-04-23
AI Technical Summary
The existing bearing structure of submersible pumps for wells cannot effectively guarantee the coaxiality and perpendicularity of each bearing, resulting in localized stress and wear, and the wear is accelerated when used in water containing silt and sand.
The ceramic bearing and elastic sleeve adopt an external convex spherical surface and an internal concave spherical surface structure, combined with the design of limiting groove and limiting strip, to ensure the coaxiality and perpendicularity of the ceramic bearing. The elastic adjustment of the elastic sleeve avoids being too tight or too loose, reducing wear and noise.
This effectively ensures the coaxiality and perpendicularity of the ceramic bearings, extends their service life, and reduces wear and noise through wear resistance and elasticity adjustment, thereby improving product reliability.
Smart Images
Figure CN223938308U_ABST
Abstract
Description
Technical fields:
[0001] This utility model belongs to the field of water pump technology, and specifically refers to a bearing structure for a well submersible pump. Background technology:
[0002] Existing submersible pump bearings use a combination of ceramic and rubber, such as Figure 1 As shown, the rubber bearing 1 is tightly fitted and fixed to the bearing housing 2, and the ceramic bushing 3 is assembled on the rotating shaft 4. During operation, the bushing 3 and the rotating shaft 4 rotate together, with a rotational clearance between the bearing 1 and the bushing 3. Submersible pumps for wells have up to 80 impeller stages, requiring one bearing at certain intervals between impellers. The existing structure cannot adequately guarantee the coaxiality of each bearing. During operation, some bearings bear significant radial forces, and the perpendicularity of each bearing cannot be guaranteed. Furthermore, some bearings experience localized stress during operation, making them prone to wear. Moreover, the presence of sediment in the pumped water accelerates bearing wear. Summary of the Invention:
[0003] The purpose of this invention is to provide a bearing structure for a submersible pump for wells, which can effectively ensure the coaxiality and perpendicularity of each ceramic bearing, effectively delay wear, and extend service life.
[0004] This utility model is implemented as follows:
[0005] A bearing structure for a submersible pump for wells includes a bearing housing and a ceramic bushing that is circumferentially fixed and fitted onto a rotating shaft. A ceramic bearing is rotatably fitted onto the ceramic bushing, and an elastic sleeve that is fixedly installed on the bearing housing is fitted onto the ceramic bearing. The outer sidewall of the ceramic bearing is a convex spherical surface, and the inner sidewall of the elastic sleeve is a concave spherical surface that matches the convex spherical surface.
[0006] In the bearing structure of the above-mentioned submersible pump for wells, the elastic sleeve includes an upper sleeve and a lower sleeve. The upper sleeve is fitted onto the upper half of the ceramic bearing, and the lower sleeve is fitted onto the lower half of the ceramic bearing. The inner sidewalls of the upper sleeve and the lower sleeve are concave spherical surfaces.
[0007] In the bearing structure of the above-mentioned submersible pump for wells, the bearing housing is provided with an annular boss for upper limit positioning of the upper sleeve and a limiting plate for lower limit positioning of the lower sleeve, and the limiting plate is fixed to the bearing housing by screws.
[0008] In the bearing structure of the aforementioned submersible pump for wells, the shank of the screw passes through the limiting plate and is screwed into the bearing housing.
[0009] In the bearing structure of the aforementioned submersible pump for wells, the annular boss and the bearing housing are an integral structure.
[0010] In the bearing structure of the above-mentioned submersible pump for wells, a gap is left between the upper sleeve and the lower sleeve.
[0011] In the bearing structure of the above-mentioned submersible pump for wells, a limiting strip is provided on the outer side of the ceramic bearing, and a limiting groove is provided on the inner side of the elastic sleeve. The ceramic bearing is circumferentially limited in the elastic sleeve by the limiting strip and the limiting groove, and the width of the limiting groove is greater than the width of the limiting strip.
[0012] In the bearing structure of the aforementioned submersible pump for wells, the limiting strip is disposed on the outer side of the upper and lower sleeves.
[0013] In the bearing structure of the above-mentioned submersible pump for wells, the difference in width between the limiting groove and the limiting strip is 0.5-1.2mm.
[0014] In the bearing structure of the above-mentioned submersible pump for wells, the outer side wall of the elastic sleeve corresponding to the position of the limiting groove protrudes to form a convex strip, and the bearing seat is provided with a groove adapted to the convex strip.
[0015] In the bearing structure of the above-mentioned submersible pump for wells, the convex strip is provided on the outer side wall of the upper and lower sleeves.
[0016] In the bearing structure of the aforementioned submersible pump for wells, the limiting plate is pressed onto the protruding strip.
[0017] In the bearing structure of the above-mentioned submersible pump for wells, multiple limiting strips and limiting grooves are evenly distributed around the circumference.
[0018] In the bearing structure of the above-mentioned submersible pump for wells, the material of the elastic sleeve is rubber or elastic plastic, and the hardness is 50-85HA.
[0019] In the bearing structure of the above-mentioned submersible pump for wells, the rotating shaft is a hexagonal shaft, and the inner hole of the ceramic bushing is a hexagonal hole.
[0020] The outstanding advantages of this utility model compared to the prior art are:
[0021] The mating surfaces of the ceramic bearing and the elastic sleeve in this invention are an externally convex spherical surface and an internally concave spherical surface. Through spherical contact, when the product is running, the ceramic bearing self-corrects along the spherical surface due to force, ensuring the coaxiality and perpendicularity of each ceramic bearing. Simultaneously, it ensures that the ceramic bearing is always at its maximum stress area, effectively delaying wear and extending service life. Furthermore, the ceramic bearing is made of ceramic material, which has excellent wear resistance, ultimately significantly delaying wear and improving product lifespan. At the same time, the ceramic sleeve is fitted with an elastic sleeve, effectively preventing it from being too tight and unable to rotate for self-correction, and also preventing it from being too loose and causing vibration and noise. Attached image description:
[0022] Figure 1 This is a cross-sectional view of the prior art;
[0023] Figure 2 This is a cross-sectional view of the present invention;
[0024] Figure 3 This is a perspective view of the ceramic bearing of this utility model;
[0025] Figure 4 This is a perspective view of the upper sleeve of this utility model;
[0026] Figure 5 This is a perspective view of the lower sleeve of this utility model;
[0027] Figure 6 This is a perspective view of the limiting plate of this utility model;
[0028] Figure 7 This is a perspective view of the bearing housing of this utility model.
[0029] Figure label:
[0030] Figure 1 In Chinese: 1. Bearing; 2. Bearing housing; 3. Bushing; 4. Shaft.
[0031] Figure 2-7 In the middle: 11. Bearing housing; 12. Ceramic bushing; 13. Ceramic bearing; 14. Elastic sleeve; 141. Upper sleeve; 142. Lower sleeve; 15. Outer convex spherical surface; 16. Inner concave spherical surface; 17. Annular boss; 18. Limiting plate; 19. Screw; 20. Clearance; 21. Limiting strip; 22. Limiting groove; 23. Raised strip; 24. Groove. Detailed implementation method:
[0032] The present invention will be further described below with reference to specific embodiments. See also: Figure 2 —7:
[0033] A bearing structure for a submersible pump for wells includes a bearing housing 11 and a ceramic bushing 12 that is circumferentially fixed and fitted onto a rotating shaft. A ceramic bearing 13 is rotatably fitted onto the ceramic bushing 12. An elastic sleeve 14, which is fixedly installed on the bearing housing 11, is fitted onto the ceramic bearing 13. The outer sidewall of the ceramic bearing 13 is a convex spherical surface 15, and the inner sidewall of the elastic sleeve 14 is a concave spherical surface 16 that matches the convex spherical surface 15.
[0034] The working principle of this utility model is as follows: Figure 2-7 As shown, when the shaft rotates, it drives the ceramic bushing 12 to rotate, while the ceramic bearing 13, the elastic sleeve 14 and the bearing seat 11 do not rotate.
[0035] The mating surfaces of the ceramic bearing 13 and the elastic sleeve 14 in this invention are an externally convex spherical surface 15 and an internally concave spherical surface 16. That is, through spherical contact, when the product is running, the ceramic bearing 13 self-corrects along the spherical surface due to the force, so as to ensure the coaxiality and perpendicularity of each ceramic bearing 13, and at the same time ensure that the ceramic bearing 13 is always in the maximum force area, effectively delaying wear and extending service life. Moreover, the ceramic bearing 13 is made of ceramic material, which has good wear resistance, ultimately significantly delaying the wear of the ceramic bearing 13 and improving the service life of the product.
[0036] The ceramic bushing 13 of this invention is fitted with an elastic sleeve 14 on its outer side, which effectively prevents it from being too tightly fitted to the ceramic bushing 13 and thus unable to rotate and self-correct, and also prevents it from being too loosely fitted to the ceramic bushing 13 and thus vibrating and generating noise.
[0037] The structure of elastic sleeve 14: as follows Figure 2-5 As shown, the elastic sleeve 14 includes an upper sleeve 141 and a lower sleeve 142. The upper sleeve 141 is fitted onto the upper half of the ceramic bearing 13, and the lower sleeve 142 is fitted onto the lower half of the ceramic bearing 13. The inner sidewalls of the upper sleeve 141 and the lower sleeve 142 are the concave spherical surfaces 16, which facilitates the installation of the elastic sleeve 14 onto the ceramic bearing 13.
[0038] The installation structure of the elastic sleeve 14 is as follows: Figure 2 , 6 As shown in Figure 7, the bearing housing 11 is provided with an annular boss 17 for upper limit positioning of the upper sleeve 141 and a limiting plate 18 for lower limit positioning of the lower sleeve 142. The limiting plate 18 is fixed to the bearing housing 11 by screws 19. The structure is simple and easy to install and process. The spherical structure of the ceramic bushing 13 and the upper sleeve 141 limits the lower sleeve 141, and the spherical structure of the ceramic bushing 13 and the lower sleeve 142 limits the lower sleeve 142.
[0039] The specific installation structure of screw 19: The shank of screw 19 passes through the limiting plate 18 and is screwed to the bearing seat 11.
[0040] Furthermore, the annular boss 17 and the bearing housing 11 are an integral structure.
[0041] To avoid processing errors affecting the assembly of the elastic sleeve 14, a gap 20 is left between the upper sleeve 141 and the lower sleeve 142.
[0042] To prevent the ceramic bearing 13 from rotating around the axis of the shaft along with the ceramic bushing 12, such as Figure 3-5As shown, the ceramic bearing 13 is provided with a limiting strip 21 on the outside and a limiting groove 22 on the inside of the elastic sleeve 14. The ceramic bearing 13 is circumferentially limited in the elastic sleeve 14 by the limiting strip 21 and the limiting groove 22. The width of the limiting groove 22 is greater than the width of the limiting strip 21, so that the ceramic bearing 13 can perform a small self-correction relative to the elastic sleeve 14.
[0043] Furthermore, the limiting strip 21 is disposed on the outside of the upper sleeve 141 and the lower sleeve 142.
[0044] Preferably, the width difference between the limiting groove 22 and the limiting strip 21 is 0.5-1.2 mm. In this embodiment, the width difference between the limiting groove 22 and the limiting strip 21 is 0.7 mm.
[0045] To strengthen the limit groove 22, such as Figure 4 , 5 As shown in Figure 7, the outer side wall of the elastic sleeve 14, corresponding to the position of the limiting groove 22, protrudes to form a convex strip 23. The bearing seat 11 is provided with a groove 24 that matches the convex strip 23 to circumferentially limit the elastic sleeve 14 and restrict the elastic sleeve 14 from rotating around the axis of the rotating shaft.
[0046] Furthermore, the protrusion 23 is provided on the outer side wall of the upper sleeve 141 and the lower sleeve 142.
[0047] In the bearing structure of the above-mentioned submersible pump for wells, the limiting plate 18 is pressed onto the protrusion 23.
[0048] To achieve a better limiting effect, multiple limiting strips 21 and limiting grooves 22 are evenly distributed around the circumference. In this embodiment, four limiting strips 21 and four limiting grooves 22 are evenly distributed around the circumference.
[0049] Furthermore, the elastic sleeve 14 is made of rubber or elastic plastic, and has a hardness of 50-85HA. In this embodiment, the elastic sleeve 14 is made of rubber with a hardness of 70HA.
[0050] The ceramic bushing 12 is circumferentially fixed to the rotating shaft: the rotating shaft is a hexagonal shaft, and the inner hole of the ceramic bushing 12 is a hexagonal hole.
[0051] This invention can extend the lifespan of submersible pumps for wells by more than 5 times.
[0052] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.
Claims
1. A bearing structure for a submersible pump for wells, comprising a bearing housing (11) and a ceramic bushing (12) circumferentially fixed and fitted onto a rotating shaft, characterized in that: The ceramic bushing (12) is externally fitted with a ceramic bearing (13), and the ceramic bearing (13) is externally fitted with an elastic sleeve (14) that is fixedly installed with the bearing seat (11). The outer side wall of the ceramic bearing (13) is an outwardly convex spherical surface (15), and the inner side wall of the elastic sleeve (14) is an inwardly concave spherical surface (16) that matches the outwardly convex spherical surface (15).
2. The bearing structure of a submersible pump for wells according to claim 1, characterized in that: The elastic sleeve (14) includes an upper sleeve (141) and a lower sleeve (142). The upper sleeve (141) is fitted onto the upper half of the ceramic bearing (13), and the lower sleeve (142) is fitted onto the lower half of the ceramic bearing (13). The inner walls of the upper sleeve (141) and the lower sleeve (142) are the concave spherical surfaces (16).
3. The bearing structure of a submersible pump for wells according to claim 2, characterized in that: The bearing housing (11) is provided with an annular boss (17) for upper limit positioning of the upper sleeve (141) and a limiting plate (18) for lower limit positioning of the lower sleeve (142). The limiting plate (18) is fixed to the bearing housing (11) by screws (19).
4. The bearing structure of a submersible pump for wells according to claim 2, characterized in that: A gap (20) is left between the upper sleeve (141) and the lower sleeve (142).
5. The bearing structure of a submersible pump for wells according to claim 1, characterized in that: The ceramic bearing (13) is provided with a limiting strip (21) on the outside and a limiting groove (22) on the inside of the elastic sleeve (14). The ceramic bearing (13) is circumferentially limited in the elastic sleeve (14) by the limiting strip (21) and the limiting groove (22). The width of the limiting groove (22) is greater than the width of the limiting strip (21).
6. The bearing structure of a submersible pump for wells according to claim 5, characterized in that: The difference in width between the limiting groove (22) and the limiting strip (21) is 0.5-1.2mm.
7. The bearing structure of a submersible pump for wells according to claim 5, characterized in that: The outer side wall of the elastic sleeve (14) corresponding to the position of the limiting groove (22) protrudes to form a convex strip (23), and the bearing seat (11) is provided with a groove (24) that matches the convex strip (23).
8. The bearing structure of a submersible pump for wells according to claim 5, characterized in that: The limiting strip (21) and the limiting groove (22) are each evenly distributed around the circumference.
9. The bearing structure of a submersible pump for wells according to claim 1, characterized in that: The elastic sleeve (14) is made of rubber or elastic plastic and has a hardness of 50-85HA.