Vibration reduction structure of rigid coupling for pump

Abstract

The utility model relates to a damping structure of a rigid coupling for a pump, which comprises a shaft sleeve, a driving shaft extending out of a motor shell, a transmission shaft arranged in a pump body, a coupling arranged between the driving shaft and the transmission shaft, a shaft sleeve sleeved outside the coupling and in sliding fit with the coupling, and fixed on a limiting part of the motor shell, and a flexible support structure positioned in the shaft sleeve, according to the rigid coupling for the pump, radial swing of the coupling is effectively limited, continuous centering of the axis of the driving shaft and the axis of the transmission shaft is guaranteed, vibration and noise are further reduced, the transmission accuracy and stability of the rigid coupling for the pump are improved, and the rigid coupling for the pump is suitable for pump equipment and has the advantages of being simple, compact and durable in structure. And wider application requirements can be met.

Description

Technical Field

[0001] This utility model belongs to the field of coupling technology, and in particular relates to a vibration reduction structure for a rigid coupling for pumps. Background Technology

[0002] A rigid coupling is a mechanical component used to connect two shafts and transmit torque. It ensures synchronous rotation between the shafts by being directly fixed to them.

[0003] During the rotation of the pump drive shaft, radial oscillation occurs due to the radial pressure from the impeller. Patent application No. 202210633642X discloses a pump body and motor drive mounting structure, revealing an innovative design. This design effectively alleviates the dynamic impact vibration problem between the drive shaft and the transmission shaft by introducing a vibration-damping support structure and a flexible self-aligning structure, and enhances the support stability at the end of the transmission shaft. However, despite the significant improvement in system performance, this design still has a key technical limitation: it fails to effectively limit the radial oscillation of the coupling.

[0004] Therefore, how to reduce the radial runout of rigid couplings, thereby reducing their vibration amplitude and noise during transmission and improving their transmission accuracy and stability is the research topic of this utility model. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a vibration-damping structure for rigid couplings used in pumps. This structure ensures continuous alignment of the shaft, thereby effectively reducing vibration and noise, and further improving the accuracy and stability of the transmission of rigid couplings used in pumps.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A vibration damping structure for a rigid coupling used in a pump includes a drive shaft extending from a motor housing and a transmission shaft disposed within the pump body. A coupling is provided between the drive shaft and the transmission shaft, including a bushing that is slidably fitted onto the outside of the coupling. A limiting part is provided on the motor housing. A flexible support structure capable of flexibly supporting the radial direction of the drive shaft is installed inside the coupling. The bushing is fixed on the limiting part, and the flexible support structure is located inside the bushing.

[0008] Preferably, a lubrication groove is formed between the coupling and the bushing, and a sealing cover that can seal the opening of the lubrication groove is detachably fixed to the lubrication groove.

[0009] Preferably, the coupling is fitted with a first sliding bearing that is interference-fitted with it, and the inner wall of the bushing protrudes to form a slide that slides with the first sliding bearing. The lubrication groove is mirror-distributed on both sides of the slide and the first sliding bearing and connects with the mating surfaces of the two.

[0010] Preferably, a first sealing ring is embedded between the sealing cover and the bushing, and a second sealing ring is embedded between the bushing and the limiting part.

[0011] Preferably, a splined bushing for connecting the drive shaft is fixedly installed inside the coupling, and the flexible support structure includes a support and a protective sleeve fixedly installed inside the coupling. The protective sleeve is sleeved on the outside of the drive shaft and fixedly installed in the mounting groove formed by the cooperation of the support and the splined bushing.

[0012] Preferably, a second sliding bearing is fixedly installed inside the limiting part, which is sleeved on the outside of the drive shaft and slides with it. The second sliding bearing is disposed close to or near the end face of the motor housing.

[0013] Preferably, the outer surfaces of both the first and second sliding bearings are coated with a polytetrafluoroethylene wear-resistant coating.

[0014] Preferably, the bushing is inserted and fixed inside the limiting part, and a step is formed inside the limiting part that can abut against the axial end face of the bushing. After the bushing and the limiting part are assembled, their outer peripheral surface contours are consistent.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The flexible support structure can absorb and mitigate radial vibrations caused by motor operation, ensuring continuous alignment of the drive shaft and transmission shaft, improving the accuracy and stability of transmission. Through the cooperation of the bushing and the limiting part, as well as the flexible support structure inside the coupling, the radial sway of the coupling is effectively limited, thereby reducing vibration and noise caused by sway. The design of the lubrication groove and the storage and supply of lubricant reduce friction and wear between the coupling and the bushing, improving the stability and durability of the sliding fit, and providing a strong guarantee for the stable operation of pump equipment. Attached Figure Description

[0017] Figure 1 This is an isometric view of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the assembly structure of the bushing and coupling.

[0020] In the figure, 1 is the motor housing; 11 is the limiting part; 11a is the step; 111 is the second sealing ring; 2 is the drive shaft; 3 is the coupling; 31 is the splined bushing; 4 is the bushing; 41 is the slide table; 5 is the lubrication groove; 51 is the sealing cover; 511 is the first sealing ring; 6 is the first sliding bearing; 7 is the second sliding bearing; 8 is the flexible support structure; 81 is the support; and 82 is the protective sleeve. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] like Figure 1 , Figures 2-3 As shown, this embodiment provides a vibration reduction structure for a rigid coupling for a pump. A drive shaft 2 extends from a motor housing 1, and a transmission shaft is arranged inside the pump body (not shown in the figure). A coupling 3 is provided between the drive shaft 2 and the transmission shaft. The coupling 3 is characterized by including a bushing 4, which is sleeved on the outside of the coupling 3 and slides therewith. A limiting part 11 is provided on the motor housing 1. A flexible support structure 8 that can flexibly support the radial direction of the drive shaft 2 is installed inside the coupling 3. The bushing 4 is fixed on the limiting part 11 and the flexible support structure 8 is located inside the bushing 4.

[0023] Working principle: When the motor is working, the drive shaft 2 transmits rotational power to the transmission shaft through the coupling 3, driving the working parts of the pump (e.g., the impeller) to rotate. Since the coupling 3 and the bushing 4 are in sliding fit, and the bushing 4 is fixed on the limiting part 11, the coupling 3 is effectively limited in the axial and radial directions, avoiding vibration and noise caused by axial movement and radial sway. At the same time, the flexible support structure 8 provides flexible support in the radial direction of the drive shaft 2, which can absorb and mitigate the radial vibration caused by the motor. The flexible support structure 8 will undergo elastic deformation, thereby absorbing most of the vibration energy. Since the flexible support structure 8 is located inside the bushing 4, a small part of the vibration energy will be conducted to the bushing 4 and converted into heat energy or other forms of energy and dissipated, ensuring that the axes of the drive shaft 2 and the transmission shaft are continuously aligned, further effectively reducing vibration and noise, and improving the accuracy and stability of the pump's rigid coupling transmission.

[0024] Furthermore, the bushing 4 is inserted and fixed inside the limiting part 11. The limiting part 11 has a step 11a that can abut against the axial end face of the bushing 4, forming a stable axial support structure. After the bushing 4 and the limiting part 11 are assembled, their outer peripheral surface contours are consistent, which is used to optimize the overall structure after the two are assembled and reduce the space occupied in the pump body.

[0025] like Figure 2 , Figure 3As shown, in this embodiment, a lubrication groove 5 is formed between the coupling 3 and the bushing 4, and a sealing cover 51 that can seal the opening of the lubrication groove 5 is detachably fixed to the lubrication groove 5.

[0026] The lubrication groove 5 is used to store and supply lubricant to reduce friction and wear between the two. The sealing cap 51 is detachably fixed to the opening of the lubrication groove 5 to seal the lubrication groove 5 and prevent lubricant leakage and external impurities from entering.

[0027] Furthermore, the coupling 3 is fitted with a first sliding bearing 6 that is interference-fitted with it, and the inner wall of the bushing 4 protrudes to form a slide 41 that slides with the first sliding bearing 6. The lubrication groove 5 is mirror-displayed on both sides of the slide 41 and the first sliding bearing 6 and is connected to the mating surfaces of the two.

[0028] The first sliding bearing 6 is used to improve the axial support stability and sliding performance of the coupling 3, and to avoid direct contact and friction between the coupling 3 and the bushing 4. The design of the slide table 41 should ensure that the fit clearance between it and the first sliding bearing 6 is reasonable.

[0029] The lubrication groove 5 is mirror-mounted on both sides of the slide table 41 and the first sliding bearing 6, and connects with the mating surfaces of the two. In this way, when the lubricant is injected into the lubrication groove 5, it can flow evenly from both sides to the mating surfaces of the slide table 41 and the first sliding bearing 6 and fill the mating gap, achieving an effective lubrication effect.

[0030] Furthermore, a first sealing ring 511 is embedded between the sealing cover 51 and the bushing 4, and a second sealing ring 111 is embedded between the bushing 4 and the limiting part 11. The sealing effect of the first sealing ring 511 and the second sealing ring 111 further enhances the fixing stability and sealing effect of the bushing 4 on the motor housing 1, preventing the bushing 4 from loosening and leaking during equipment operation, thereby improving the operational reliability and service life of the equipment.

[0031] Furthermore, a splined bushing 31 for connecting the drive shaft 2 is fixedly installed inside the coupling 3. The flexible support structure 8 includes a support 81 and a protective sleeve 82 fixedly installed inside the coupling 3. The protective sleeve 82 is sleeved on the outside of the drive shaft 2 and embedded in the mounting groove formed by the cooperation of the support 81 and the splined bushing 31.

[0032] The design of the spline bushing 31 enables the drive shaft 2 to be firmly connected to the coupling 3, while ensuring the coaxiality between the two and the reliability of torque transmission. As the main supporting component of the flexible support structure 8, the material and shape of the support 81 should be selected according to the design requirements of the flexible support structure 8 to ensure that it has good rigidity and stability when configured in the coupling 3. The protective sleeve 82 should have a certain degree of elasticity, which can absorb and mitigate the vibration of the drive shaft 2 in the radial direction to a certain extent. The protective sleeve 82 is fitted onto the drive shaft 2 and should ensure that the fit between it and the drive shaft 2 is tight to reduce relative motion friction and wear.

[0033] like Figure 2 As shown, in this embodiment, a second sliding bearing 7 is fixedly installed inside the limiting part 11, sleeved on the outside of the drive shaft 2 and slidably engaged with it. The second sliding bearing 7 is disposed close to or near the end face of the motor housing 1. The second sliding bearing 7 provides stable axial support for the part where the drive shaft 2 connects to the motor housing 1, forming a support engagement with the first sliding bearing 6, ensuring that the axis of the drive shaft 2 is aligned with the axis of the transmission shaft, and reducing vibration and noise caused by eccentricity.

[0034] Furthermore, the outer surfaces of both the first sliding bearing 6 and the second sliding bearing 7 are coated with a polytetrafluoroethylene (PTFE) wear-resistant coating that allows them to slide and engage with the slide table 41 and the drive shaft 2, respectively. By applying the PTFE wear-resistant coating to the outer surfaces of the first sliding bearing 6 and the second sliding bearing 7, the stability and wear resistance of the sliding fit are further improved. This structure can maintain good performance and stability even in harsh deep well pump environments, thus meeting a wider range of application needs.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A vibration damping structure for a rigid coupling used in a pump, wherein a drive shaft (2) extends from a motor housing (1), a transmission shaft is arranged within the pump body, and a coupling (3) is provided between the drive shaft (2) and the transmission shaft, characterized in that, Includes a bushing (4), which is sleeved on the outside of the coupling (3) and slides therewith. The motor housing (1) is provided with a limiting part (11). The coupling (3) is equipped with a flexible support structure (8) that can provide flexible radial support for the drive shaft (2). The bushing (4) is fixed on the limiting part (11) and the flexible support structure (8) is located inside the bushing (4).

2. The vibration damping structure for a rigid coupling for a pump according to claim 1, characterized in that, A lubrication groove (5) is formed between the coupling (3) and the bushing (4), and a sealing cover (51) that can seal the opening of the lubrication groove (5) is detachably fixed to the lubrication groove (5).

3. The vibration damping structure for a rigid coupling for a pump according to claim 2, characterized in that, The coupling (3) is fitted with a first sliding bearing (6) that is interference-fitted with it. The inner wall of the bushing (4) protrudes to form a slide (41) that slides with the first sliding bearing (6). The lubrication groove (5) is mirror-arranged on both sides of the slide (41) and the first sliding bearing (6) and is connected to the mating surfaces of the two.

4. The vibration damping structure for a rigid coupling for a pump according to claim 3, characterized in that, A first sealing ring (511) is embedded between the sealing cover (51) and the bushing (4), and a second sealing ring (111) is embedded between the bushing (4) and the limiting part (11).

5. The vibration damping structure for a rigid coupling for a pump according to claim 3, characterized in that, The coupling (3) is fixedly installed with a splined bushing (31) for connecting the drive shaft (2). The flexible support structure (8) includes a support (81) and a protective sleeve (82) fixedly installed in the coupling (3). The protective sleeve (82) is sleeved on the outside of the drive shaft (2) and fixedly installed in the mounting groove formed by the cooperation of the support (81) and the splined bushing (31).

6. The vibration damping structure for a rigid coupling for a pump according to claim 5, characterized in that, The limiting part (11) is fixedly installed with a second sliding bearing (7) sleeved on the outside of the drive shaft (2) and slidingly engaged with it. The second sliding bearing (7) is set close to or near the end face of the motor housing (1).

7. The vibration damping structure for a rigid coupling for a pump according to claim 6, characterized in that, The outer surfaces of the first sliding bearing (6) and the second sliding bearing (7) are coated with a polytetrafluoroethylene wear-resistant coating.

8. A vibration damping structure for a rigid coupling for a pump according to any one of claims 1-4, characterized in that, The bushing (4) is inserted and fixed inside the limiting part (11). The limiting part (11) has a step (11a) that can abut against the axial end face of the bushing (4). After the bushing (4) and the limiting part (11) are assembled, their outer peripheral contours are consistent.

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