A flexible coupling for the motor shaft of a small plunger pump

Abstract

This utility model discloses a flexible coupling for a small plunger pump motor shaft, belonging to the field of coupling technology. It includes a pair of connecting bushings for connecting the motor output shaft and the plunger pump input shaft. Both bushings are hollow, and a connecting disc is fitted at each end close to the other. An elastic connector is provided between the two connecting discs, suspended between them. Six sets of wear-resistant pads are circumferentially distributed at equal intervals on both sides of the elastic connector, and these six sets of wear-resistant pads are in contact with the two connecting discs. The elastic connector is made of rubber and is hexagonal. This technical solution effectively solves the problems of rigid couplings being unable to compensate for displacement and having high vibration and noise, as well as the problems of existing flexible couplings having complex structures, limited buffering effects, and rapid wear of the elastic body, through the structure of the hexagonal elastic connector made of rubber, wear-resistant pads, connecting bushings, and connecting discs. It is also easy to maintain and extends service life.

Description

Technical Field

[0001] This utility model relates to the field of coupling technology, specifically to a flexible coupling for a small plunger pump motor shaft. Background Technology

[0002] A coupling is a mechanical component used to connect two shafts in different mechanisms, enabling them to rotate together and transmit torque. In high-speed, heavy-load power transmission, some couplings also serve to buffer, dampen vibrations, and improve the dynamic performance of the shaft system.

[0003] Small piston pumps are widely used in hydraulic systems, and their motor shaft and pump shaft are usually connected by a coupling. Existing couplings have the following problems: rigid couplings cannot compensate for the relative displacement between the two shafts, which easily generates large vibrations and noise; while existing flexible couplings are mostly complex in structure, have limited buffering effect, and are prone to excessive wear of the elastic element when transmitting torque, affecting their service life. Utility Model Content

[0004] The purpose of this invention is to provide a flexible coupling for a small plunger pump motor shaft to solve the problems mentioned in the background art.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] A small plunger pump motor shaft flexible coupling includes a pair of connecting bushings for connecting the motor output shaft and the plunger pump input shaft. Both bushings are hollow, and a connecting disc is fitted at one end close to the other. An elastic connector, made of rubber and suspended, is provided between the connecting discs to effectively buffer vibrations and impacts generated during motor and plunger pump operation, reducing equipment wear and extending service life. Six sets of wear-resistant pads are circumferentially distributed at equal intervals on both sides of the elastic connector, and these six sets of pads contact the connecting discs. These pads reduce direct friction between the elastic connector and the connecting discs, improving wear resistance and extending the service life of the elastic connector. The elastic connector is made of rubber and is hexagonal. The hexagonal structure ensures symmetrical force distribution and stable torque transmission. Several fixing components connect the elastic connector to the connecting discs.

[0007] Furthermore, the top surface of the connecting plate has three sets of through holes distributed circumferentially, the top surface of the wear-resistant pad has an opening, and the fixing component includes screws. The screws pass through the openings and through holes in sequence and are threadedly connected to nuts. The cooperation between the screws and nuts makes the connection between the elastic connector, the wear-resistant pad and the connecting plate detachable, which facilitates later maintenance and replacement of parts. The three sets of through holes are distributed circumferentially to ensure uniform force on the connection and improve the stability of the connection.

[0008] Furthermore, an anti-loosening washer is fitted on the outside of the screw, and the anti-loosening washer is located between the connecting plate and the nut. The nut presses the anti-loosening washer against the surface of the connecting plate. The anti-loosening washer is pressed against the surface of the connecting plate by the nut, which can prevent the screw and nut from loosening due to equipment vibration, ensure the long-term stability of the connection, and reduce the number of maintenance times.

[0009] Furthermore, six sets of reinforcing ribs are evenly spaced on the outer circumference of the elastic connector, and the reinforcing ribs are connected to the wear-resistant pad. The reinforcing ribs can enhance the structural strength of the elastic connector and prevent it from deforming or breaking under long-term stress. At the same time, the connection between the reinforcing ribs and the wear-resistant pad can disperse the force on the wear-resistant pad and further improve the overall stability of the device.

[0010] Furthermore, the inner wall of the connecting bushing is provided with a spline groove, and an anti-slip pad is installed inside the connecting bushing, with the anti-slip pad located below the spline groove. The spline groove enables the connecting bushing to be circumferentially fixed with the motor output shaft and the plunger pump input shaft, ensuring effective torque transmission. The anti-slip pad can increase the friction between the connecting bushing and the shaft, preventing the shaft from sliding axially within the connecting bushing and improving the reliability of the connection.

[0011] Furthermore, the connecting disc is generally in the shape of an equilateral triangle, and a pair of connecting discs are arranged in a cross pattern. The equilateral triangle connecting disc structure is stable, uses less material, and has high strength. The cross arrangement can make the connection points between the connecting disc and the elastic connector more evenly distributed, and the force is more balanced when transmitting torque, reducing local stress concentration.

[0012] Furthermore, the pair of connecting bushings and elastic connectors are coaxially arranged. This coaxial arrangement ensures that the center lines of the motor output shaft, coupling, and plunger pump input shaft are aligned, reducing eccentric vibration and additional torque during operation, lowering equipment noise and wear, and improving transmission efficiency.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This small plunger pump motor shaft elastic coupling, by using a regular hexagonal elastic connector made of rubber and suspending it between a pair of connecting discs, can effectively compensate for the relative displacement between the motor output shaft and the plunger pump input shaft, significantly reducing vibration and noise and improving the buffering effect; the six sets of wear-resistant pads on both sides of the elastic connector reduce direct friction with the connecting discs, and together with the outer reinforcing ribs, slow down the wear rate of the elastic body and extend its service life; at the same time, the overall structure is assembled by connecting bushings, connecting discs and fasteners such as screws and nuts, which is simple in structure and detachable, making it easy to maintain. Attached Figure Description

[0014] Figure 1This is a first three-dimensional structural schematic diagram of the flexible coupling for the motor shaft of a small plunger pump disclosed in an embodiment of the present utility model.

[0015] Figure 2 This is an exploded structural diagram of the flexible coupling for the motor shaft of a small plunger pump disclosed in an embodiment of this utility model;

[0016] Figure 3 This is a second three-dimensional structural schematic diagram of the flexible coupling for the motor shaft of a small plunger pump disclosed in an embodiment of this utility model;

[0017] Figure 4 This is a top view of the flexible coupling for the motor shaft of a small plunger pump disclosed in an embodiment of the present invention.

[0018] Figure 5 This is a cross-sectional structural schematic diagram of the flexible coupling for the motor shaft of a small plunger pump disclosed in an embodiment of this utility model.

[0019] In the diagram: 1. Connecting bushing; 2. Connecting disc; 3. Spline groove; 4. Anti-slip pad; 5. Elastic connector; 6. Wear-resistant pad; 7. Reinforcing rib; 8. Screw; 9. Nut; 10. Anti-loosening washer; 11. Through hole; 12. Opening. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 - Figure 5This utility model provides a technical solution: a small plunger pump motor shaft elastic coupling, including a pair of connecting bushings 1, which are used to connect the motor output shaft and the plunger pump input shaft. Both connecting bushings 1 are hollow, and a connecting disc 2 is fitted onto each end close to the other. An elastic connecting body 5 is provided between the pair of connecting discs 2. Six sets of wear-resistant pads 6 are circumferentially and evenly distributed on both sides of the elastic connecting body 5, and the six sets of wear-resistant pads 6 are in contact with the pair of connecting discs 2. The elastic connecting body 5 is made of rubber. Body 5 is a regular hexagon, and several fixing parts connect the elastic connecting body 5 and a pair of connecting discs 2. The motor output shaft and the plunger pump input shaft are respectively inserted into a pair of connecting bushings 1. The connecting bushings 1 transmit torque to the elastic connecting body 5 through the connecting discs 2. The rubber elastic connecting body 5 undergoes elastic deformation during torque transmission, absorbing vibration and compensating for the relative displacement between the two shafts. The wear-resistant pad 6 acts as a buffer and provides wear resistance between the elastic connecting body 5 and the connecting discs 2, while the fixing parts ensure a stable connection between the elastic connecting body 5 and the connecting discs 2. See also Figure 3 As shown, six wear-resistant pads 6 are respectively provided on the upper and lower sides of the elastic connector 5. The two wear-resistant pads 6 arranged opposite each other form a group. There are six groups of reinforcing ribs 7. See [reference]. Figure 3 As shown, the inner and outer walls of the elastic connector 5 are provided with six reinforcing ribs 7 respectively. The two reinforcing ribs 7 that are directly opposite each other on the inner and outer sides form a group. The upper and lower ends of each reinforcing rib 7 are connected to two wear-resistant pads 6 that are directly opposite each other on the upper and lower sides respectively.

[0022] As an embodiment of this utility model, the top surface of the connecting disc 2 is further provided with three sets of through holes 11 distributed circumferentially, the top surface of the wear-resistant pad 6 is provided with an opening 12, and the fixing component includes a screw 8. The screw 8 passes through the opening 12 and the through hole 11 in sequence and is threadedly engaged with a nut 9. After the screw 8 passes through the opening 12 of the wear-resistant pad 6 and the through hole 11 of the connecting disc 2 in sequence, it is threadedly engaged with the nut 9. The tightening force of the screw 8 and the nut 9 clamps the wear-resistant pad 6 and the elastic connector 5 between a pair of connecting discs 2, thereby achieving a fixed connection of the three and ensuring that the components do not undergo relative displacement during torque transmission.

[0023] As an embodiment of this utility model, a locking washer 10 is further fitted on the outside of the screw 8, and the locking washer 10 is located between the connecting plate 2 and the nut 9. The nut 9 presses the locking washer 10 against the surface of the connecting plate 2. The locking washer 10 has a certain elasticity. When the nut 9 is tightened, the locking washer 10 undergoes elastic deformation and generates a reverse force, so that the threaded connection between the screw 8 and the nut 9 maintains the preload. Even when the equipment vibrates, it can effectively prevent the screw 8 and the nut 9 from rotating relative to each other, thus playing a role in preventing loosening.

[0024] As an embodiment of this utility model, six sets of reinforcing ribs 7 are further installed at equal intervals on the outer circumference of the elastic connector 5, and the reinforcing ribs 7 are connected to the wear-resistant pad 6. When the elastic connector 5 transmits torque, the reinforcing ribs 7 can share part of the force and reduce the degree of deformation of the elastic connector 5 body. Since the reinforcing ribs 7 are connected to the wear-resistant pad 6, when the wear-resistant pad 6 is subjected to the friction and pressure of the connecting disc 2, the reinforcing ribs 7 can distribute these forces to a larger area of ​​the elastic connector 5, avoiding damage due to excessive local stress.

[0025] As an embodiment of this utility model, the inner wall of the connecting bushing 1 is provided with a spline groove 3, and an anti-slip pad 4 is installed inside the connecting bushing 1, with the anti-slip pad 4 located below the spline groove 3. After the motor output shaft and the plunger pump input shaft are inserted into the connecting bushing 1, the spline on the shaft meshes with the spline groove 3 on the inner wall of the connecting bushing 1 to achieve circumferential fixation and ensure smooth torque transmission. The anti-slip pad 4 generates friction after being squeezed by the shaft, preventing the shaft from moving axially within the connecting bushing 1 and ensuring the stability of the connection.

[0026] As an embodiment of this utility model, the connecting disk 2 is in the shape of an equilateral triangle, and a pair of connecting disks 2 are arranged in a cross pattern. The equilateral triangle connecting disk 2 itself has high structural stability and can withstand large forces. After the cross pattern is arranged, the contact positions of the connection points on the connecting disk 2 and the elastic connector 5 are more dispersed. When the torque is transmitted, the force can be transmitted through multiple evenly distributed points, avoiding excessive force on a certain connection point and damage.

[0027] As an embodiment of this utility model, the pair of connecting bushings 1 and elastic connectors 5 are arranged on the same axis. When the pair of connecting bushings 1 and elastic connectors 5 are on the same axis, the torque output by the motor can be transmitted to the input shaft of the plunger pump in a straight line, avoiding the generation of additional radial and axial forces due to different axes, and reducing the wear and energy loss of each component.

[0028] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is through a control cabinet. The control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

Claims

1. A small plunger pump motor shaft elastic coupling, characterized in that, It includes a pair of connecting bushings (1), which are used to connect the output shaft of the motor and the input shaft of the plunger pump. Both of the connecting bushings (1) are hollow and each has a connecting disc (2) fitted at one end close to the other. An elastic connector (5) is provided between the pair of connecting discs (2). Six sets of wear-resistant pads (6) are circumferentially distributed at equal intervals on both sides of the elastic connector (5), and the six sets of wear-resistant pads (6) are in contact with the pair of connecting discs (2). The elastic connector (5) is made of rubber and is a regular hexagon. Several fasteners are connected between the elastic connector (5) and the pair of connecting discs (2).

2. The flexible coupling for a small plunger pump motor shaft according to claim 1, characterized in that, The top surface of the connecting plate (2) has three sets of through holes (11) distributed circumferentially. The top surface of the wear-resistant pad (6) is provided with an opening (12). The fastener includes a screw (8). The screw (8) passes through the opening (12) and the through hole (11) in sequence and is threadedly connected to a nut (9).

3. A small plunger pump motor shaft elastic coupling according to claim 2, characterized in that, The screw (8) is fitted with an anti-loosening washer (10) on its outer side, and the anti-loosening washer (10) is located between the connecting disc (2) and the nut (9). The nut (9) presses the anti-loosening washer (10) against the surface of the connecting disc (2).

4. A small plunger pump motor shaft elastic coupling according to claim 1, characterized in that, The elastic connector (5) has six sets of reinforcing ribs (7) installed at equal intervals on its outer circumference, and the reinforcing ribs (7) are connected to the wear-resistant pad (6).

5. A small plunger pump motor shaft elastic coupling according to claim 1, characterized in that, The inner wall of the connecting bushing (1) is provided with a spline groove (3), and an anti-slip pad (4) is installed inside the connecting bushing (1), and the anti-slip pad (4) is located below the spline groove (3).

6. A small plunger pump motor shaft elastic coupling according to claim 1, characterized in that, The connecting disk (2) is an equilateral triangle, and a pair of connecting disks (2) are arranged in a cross pattern.

7. A small plunger pump motor shaft elastic coupling according to claim 1, characterized in that, The pair of connecting bushings (1) and the elastic connector (5) are arranged on the same axis.

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