An adjustable preloaded angular contact bearing seat

Abstract

The utility model discloses an adjustable pre-tightening angular contact bearing seat suitable for multistage pump rotor support. The structure is composed of bearing seat cover, front and rear angular contact bearings, front pressing plate, shaft sleeve, elastic component, middle pressing block and rear pressing seat, and is arranged coaxially around the pump shaft. The shaft sleeve is provided with a limiting step positioning inner ring, the front pressing plate clamps the front side outer ring in cooperation with the elastic component, and the middle pressing block is arranged between the two inner rings. The rear pressing seat is in threaded cooperation with the seat cover, the front end is coaxially provided with an annular pressing shoulder and an annular abutting shoulder, and is respectively abutted with the rear inner ring and abutted with the outer ring, so that the external adjustable pre-tightening is realized, and the load is transmitted to the two inner rings by the middle pressing block. The scheme realizes the synchronous pressing and end face limiting of the inner and outer rings, suppresses the single-sided no-load and slip, compensates the thermal drift by the elastic component, reduces the axial movement, and improves the assembly and maintenance efficiency and the operation reliability.

Description

Technical Field

[0001] This utility model relates to the field of pump rotor support and bearing preload technology, and in particular to an adjustable preload angular contact bearing housing. Background Technology

[0002] Multistage centrifugal pumps experience significant variations in residual axial force during start-up, shutdown, and changing operating conditions. Insufficient preload on the bearings can easily lead to axial movement, rolling element slippage, and squealing. Excessive preload, on the other hand, increases heat generation, energy consumption, and reduces lifespan. Common preload methods include placing shims, elastic elements, or relying on assembly dimensions for "hard positioning" between the inner and outer rings of the bearing. These methods typically require in-machine operation, making it difficult to accurately set and reproduce the preload amount. Furthermore, they are prone to failure after thermal drift, necessitating shutdown, disassembly, and readjustment.

[0003] Among the existing publicly available solutions, CN214248037U mainly uses an internal elastic / shim-type structure to achieve preload, with assembly and adjustment both performed inside the housing, making it difficult to directly adjust the preload from the outside. Furthermore, its structure does not form an adjustable and reproducible integrated mechanism for the action path of "simultaneously pressing the inner and outer rings," which is not conducive to rapid reset and maintenance after operation. CN210769481U proposes an installation and pressing structure for angular contact bearings, but its structural features prevent the inner and outer rings from being effectively pressed simultaneously. In back-to-back or face-to-face combinations, one bearing may experience unidirectional force while the other operates unloaded, posing a risk of slippage between the steel balls and the raceway during unloaded operation. Moreover, this solution cannot achieve preload adjustment from outside the equipment, requiring disassembly for maintenance, resulting in low efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide an adjustable preload angular contact bearing housing, which can be adjusted outside the equipment, can simultaneously implement reliable end face positioning and anti-loosening of the inner and outer rings of the angular contact bearing, and can adapt to thermal drift and operating condition fluctuations.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses an adjustable preload angular contact bearing housing, including a bearing housing 10 and a pump shaft 11. The bearing housing 10 is composed of a bearing housing sleeve 1, a front angular contact bearing 2a, a rear angular contact bearing 2b, a front pressure plate 3, a shaft sleeve 4, an elastic component 5, a middle pressure block 6, and a rear pressure seat 7. The bearing housing 10 is coaxially arranged around the pump shaft 11. The bushing 4 is fitted onto the outside of the pump shaft 11; the front angular contact bearing 2a and the rear angular contact bearing 2b are fitted onto the bushing 4 and assembled into the axial through hole of the bearing housing 1; the front pressure plate 3 is set at the front end of the axial through hole of the bearing housing 1, and the elastic component 5 is located between the front pressure plate 3 and the outer ring of the front angular contact bearing 2a located on the front side; the intermediate pressure block 6 is arranged between the inner rings of the two bearings; the rear pressure seat 7 is threaded into the bearing housing 1 and can be rotated in and out from the outside; when the rear pressure seat 7 is screwed in, its front end abuts against the rear end face of the inner ring of the rear angular contact bearing 2b and stops against the rear end face of the outer ring, which is used to limit the end face of the rear inner ring and the outer ring and prevent loosening. The preload is transmitted to the two inner rings through the intermediate pressure block 6 to generate preload; at the same time, the front pressure plate 3 elastically clamps the end face of the outer ring of the front angular contact bearing 2a under the action of the elastic component 5, and cooperates with the bushing 4 to position the inner ring, so that the inner and outer rings of the two angular contact bearings are axially pressed at the same time.

[0006] As a preferred technical solution of this utility model, the front angular contact bearing 2a and the rear angular contact bearing 2b are assembled face to face, with their contact angles facing each other; the intermediate pressure block 6 abuts against the opposing end faces of the two inner rings.

[0007] As a preferred technical solution of this utility model, the front pressure plate 3 is detachably fixed to the bearing housing 1 by screws, which facilitates assembly and maintenance.

[0008] As a preferred technical solution of this utility model, the elastic component 5 is a disc spring assembly, a wave spring, or an elastic washer, used to maintain stable preload during thermal drift or load fluctuation.

[0009] As a preferred technical solution of this utility model, the bushing 4 is provided with a bushing limiting step 9 for limiting and positioning the axial position of the front angular contact bearing 2a, and the step 9 abuts against the end face of the inner ring of the front angular contact bearing 2a.

[0010] As a preferred technical solution of this utility model, the front end face of the rear pressure seat 7 is coaxially provided with an annular contact shoulder 8a and an annular pressure shoulder 8b; the annular pressure shoulder 8b abuts against the rear end face of the inner ring of the rear angular contact bearing 2b, and the annular contact shoulder 8a stops against the rear end face of its outer ring, which is used for limiting and preventing loosening of the outer ring end face and preventing loosening and limiting the stroke of the inner ring.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Externally adjustable, the rear pressure seat 7 and the seat sleeve 1 are threaded together to achieve external fine-tuning and pre-tightening, resulting in high assembly and maintenance efficiency; 2. Preload is applied to both the inner and outer rings simultaneously to prevent unloaded bearings and slippage on one side; 3. Thermal drift resistance: The elastic component 5 provides elastic preload, which can automatically compensate for thermal expansion and contraction and load fluctuations, maintaining stable stiffness and lateral movement control. 4. Maintenance-friendly: the front pressure plate 3 is removable, and the bearings can be pulled out and replaced; the rear pressure seat 7 provides end face limiting and anti-loosening, ensuring reliable operation. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the bearing housing component of this utility model; Figure 2 This is a cross-sectional view of the present invention; In the diagram: 1. Bearing housing sleeve; 2a. Front angular contact bearing; 2b. Rear angular contact bearing; 3. Front pressure plate; 4. Shaft sleeve; 5. Elastic component; 6. Middle pressure block; 7. Rear pressure seat; 8a. Annular stop shoulder; 8b. Annular pressure shoulder; 9. Shaft sleeve limiting step; 10. Bearing housing; 11. Pump shaft. Detailed Implementation

[0013] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0014] In the attached diagram, all identical reference numerals refer to the same components.

[0015] This article takes the side closer to the front pressure plate 3 as the front end and the side closer to the rear pressure seat 7 as the rear end.

[0016] like Figure 1-2 As shown, this utility model provides an adjustable preload angular contact bearing housing, which is arranged around the pump shaft 11. A bushing 4 is fitted onto the pump shaft 11, with a bushing limiting step 9 forming on it to serve as an axial positioning reference for the inner rings of the two bearings. A front angular contact bearing 2a and a rear angular contact bearing 2b are fitted onto the bushing 4 and inserted into the axial through hole of the bearing housing 1, with the two bearings assembled face-to-face. A front pressure plate 3 is provided at the front end, and an elastic component 5 is arranged between the front pressure plate 3 and the outer ring of the front angular contact bearing 2a for elastic clamping and compensation of the front outer ring. A middle pressure block 6 is arranged between the two inner rings of the bearings to evenly transmit the axial force to the two inner rings during preload. A rear pressure seat 7 is threaded into the bearing housing 1, and its front end face is coaxially provided with an annular stop shoulder 8a and an annular pressure shoulder 8b; the annular pressure shoulder 8b abuts against the rear end face of the inner ring of the rear angular contact bearing 2b, and the annular stop shoulder 8a abuts against the rear end face of its outer ring, achieving rear end face limiting and anti-loosening.

[0017] The method of using this utility model is as follows: 1. Assembly: Install the bushing 4 onto the pump shaft 11 and position it. Then, install the front angular contact bearing 2a, the middle pressure block 6, and the rear angular contact bearing 2b in sequence and assemble them into the axial through hole of the bearing housing 1. First, install the elastic component 5, then install and fix the front pressure plate 3, and screw in the rear pressure seat 7 until it forms the initial zero position with the bearing housing 1. 2. Pre-tightening setting: Screw in the rear pressure seat 7 from the zero position, and establish the target pre-tightening between the two inner rings by the middle pressure block 6; check the axial movement and no-load temperature rise, and make fine adjustments if necessary; 3. Operation verification: After the thermal state stabilizes, verify the axial movement and temperature rise. If necessary, the pressure seat 7 can be rotated slightly to fine-tighten the preload. The elastic component 5 compensates for thermal drift.

[0018] Furthermore, the elastic component 5 can be a single or multiple disc springs in series or parallel, wave springs, or elastic washers to obtain the required displacement characteristics; a sealing or dustproof structure can be provided between the front pressure plate 3 and the bearing housing 1 to improve reliability.

[0019] Furthermore, the outer periphery of the rear pressure seat 7 can be provided with knurling or a wrench surface, and a stop screw or elastic retaining ring can be added as an anti-loosening mechanism; a scale can also be provided on the outer periphery of the rear pressure seat 7 and a reference mark can be provided on the outer wall of the bearing housing 10 for reading and reproducing the preload setting.

[0020] Furthermore, the series and contact angle of the bearing pair can be selected according to the pump speed and load, such as 70 / 72 series, 15° / 25° contact angle, etc. This utility model does not limit the specific model.

[0021] Furthermore, the materials of the components can be selected according to the medium and environment. The bearing housing 1 and the front pressure plate 3 can be made of stainless steel or alloy steel, and the rear pressure seat 7 can be made of tempered steel and surface treated to improve wear resistance and corrosion resistance.

[0022] This invention relates to an angular contact bearing housing that allows for external adjustment of preload without disassembly. It provides stable and reproducible preload and end face limiting throughout the pump's entire service life, making it suitable for applications with large axial force fluctuations, such as multi-stage pumps.

[0023] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adjustable preload angular contact bearing housing, comprising a bearing housing (10) and a pump shaft (11), wherein the bearing housing (10) comprises a bearing housing sleeve (1), a front angular contact bearing (2a), a rear angular contact bearing (2b), a front pressure plate (3), a shaft sleeve (4), an elastic component (5), a middle pressure block (6), and a rear pressure seat (7), characterized in that, The bearing housing (10) is coaxially arranged around the pump shaft (11). The bushing (4) is fitted on the outside of the pump shaft (11). The front angular contact bearing (2a) and the rear angular contact bearing (2b) are fitted on the outside of the bushing (4) and assembled in the axial through hole of the bearing housing (1). The front pressure plate (3) is set at the front end of the axial through hole of the bearing housing (1). The elastic component (5) is located between the front pressure plate (3) and the outer ring of the front angular contact bearing (2a). The intermediate pressure block (6) is arranged between the inner rings of the front angular contact bearing (2a) and the rear angular contact bearing (2b); the rear pressure seat (7) is threadedly engaged with the bearing housing (1) and can be rotated externally to move forward and backward axially. Its front end abuts against the rear end face of the inner ring of the rear angular contact bearing (2b) and stops against the rear end face of the outer ring. The preload is transmitted to the two inner rings through the intermediate pressure block (6) to generate preload. At the same time, the front pressure plate (3) elastically clamps the end face of the outer ring of the front angular contact bearing (2a) under the action of the elastic component (5), so that the inner and outer rings of the front angular contact bearing (2a) and the rear angular contact bearing (2b) are axially pressed at the same time.

2. The adjustable preload angular contact bearing housing according to claim 1, characterized in that, The front angular contact bearing (2a) and the rear angular contact bearing (2b) are assembled face to face, with their contact angles facing each other; the intermediate pressure block (6) abuts against the opposing end faces of the inner rings of the front angular contact bearing (2a) and the rear angular contact bearing (2b).

3. The adjustable preload angular contact bearing housing according to claim 1, characterized in that, The front pressure plate (3) is detachably fixed to the bearing housing (1) by screws.

4. The adjustable preload angular contact bearing housing according to claim 1, characterized in that, The elastic component (5) is a disc spring assembly, a wave spring, or an elastic washer, which maintains stable preload during thermal drift or load fluctuation.

5. An adjustable preload angular contact bearing housing according to claim 1, characterized in that, The bushing (4) is provided with a bushing limiting step (9) for limiting and positioning the axial position of the front angular contact bearing (2a), and the bushing limiting step (9) abuts against the inner ring end face of the front angular contact bearing (2a).

6. An adjustable preload angular contact bearing housing according to claim 1, characterized in that, The front end face of the rear pressure seat (7) is coaxially provided with an annular stop shoulder (8a) and an annular pressure shoulder (8b). The annular pressure shoulder (8b) abuts against the rear end face of the inner ring of the rear angular contact bearing (2b), and the annular stop shoulder (8a) stops against the rear end face of the outer ring of the rear angular contact bearing (2b). The abutting and stopping are used to limit and prevent loosening of the rear end face of the inner ring and the outer ring respectively, and together with the middle pressure block (6), they establish the transmission path of the inner ring preload.

Images