Pump with modified coupling structure

Abstract

The present invention relates to a pump with a modified coupling structure, which solves the problem of eccentricity between the pump shaft and the motor shaft head in the prior art. The technical solution adopted is as follows: the coupling includes a sleeve and a rubber sleeve fixed in the sleeve, one end of the sleeve is provided with a motor shaft head insertion hole, and the other end is provided with a pump shaft insertion hole, the motor shaft head insertion hole and the pump shaft insertion hole are coaxially arranged, the rubber sleeve is inserted into the pump shaft insertion hole, and the rubber sleeve is interference-fitted with the shaft end of the pump shaft. The effect is: changing the coupling structure is conducive to absorbing the eccentricity of the pump shaft and the motor shaft head, so that the pump shaft and the motor shaft head remain coaxial, improving the problem of the pump shaft breaking due to eccentric rotation, extending the service life of the pump shaft, and reducing the maintenance rate and use cost.

Description

Technical Field

[0001] The invention relates to a pump, in particular to a pump with a modified coupling structure. Background Art

[0002] Theoretically, the pump shaft and the motor shaft head are assembled in a coaxial manner. However, due to factors such as part size, processing and assembly technology, and operating conditions, there is a certain degree of eccentricity between the pump shaft and the motor shaft head. The ideal coaxial state cannot be achieved when the pump is running. Moreover, the coupling and the pump shaft are rigidly connected. Long-term eccentric operation can easily cause the pump shaft to be subjected to excessive force at the coupling and fatigue fracture, which ultimately affects the normal use of the pump, brings inconvenience to its use, and increases the maintenance rate and use cost of the pump. Summary of the invention

[0003] The object of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a pump with a modified coupling structure. Changing the coupling structure is conducive to absorbing the eccentricity of the pump shaft and the motor shaft head, so that the pump shaft and the motor shaft head remain coaxial, improve the problem of pump shaft breakage due to eccentric rotation, extend the service life of the pump shaft, and reduce the maintenance rate and use cost.

[0004] The above technical purpose of the present invention is mainly solved by the following technical solutions: a pump with a modified coupling structure, comprising a coupling arranged at the end of a pump shaft, the coupling connecting the pump shaft and the motor shaft head, characterized in that the coupling comprises a sleeve and a rubber sleeve fixed in the sleeve, one end of the sleeve is provided with a motor shaft head insertion hole, the other end is provided with a pump shaft insertion hole, the motor shaft head insertion hole and the pump shaft insertion hole are arranged coaxially, the rubber sleeve is inserted into the pump shaft insertion hole, and the rubber sleeve is interference fit with the shaft end of the pump shaft. Changing the coupling structure is conducive to absorbing the eccentricity of the pump shaft and the motor shaft head, so that the pump shaft and the motor shaft head remain coaxial, improve the problem of the pump shaft breaking due to eccentric rotation, extend the service life of the pump shaft, and reduce the maintenance rate and use cost. Specifically, a rubber sleeve is arranged in the coupling, the pump shaft is inserted into the rubber sleeve, and the eccentricity between the motor shaft head and the pump shaft is absorbed by the elastic deformation of the rubber sleeve, so that the motor shaft head and the pump shaft can remain coaxial, reduce or even avoid the possibility of the pump shaft breaking at the coupling, and improve the service life of the pump shaft.

[0005] As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures:

[0006] In order to facilitate the production of sleeves and to adapt to the sizes of motor shaft heads and pump shafts, the coupling is composed of multiple parts: a step ring is arranged in the sleeve, the step ring is located between the pump shaft insertion hole and the motor shaft head insertion hole, the step surface of the step ring is located in the pump shaft insertion hole, a gasket and an inner sleeve are arranged in the pump shaft insertion hole, the gasket is placed on the step surface, the inner end of the inner sleeve abuts against the gasket, an interference fit is formed between the inner sleeve and the sleeve, and the rubber sleeve is interference-fitted in the shaft hole of the inner sleeve. Since the rubber sleeve has a certain elastic deformation capacity, when the rubber sleeve directly interferes with the sleeve, it is difficult for the rubber sleeve to be inserted into the sleeve, or it is difficult to ensure that the rubber sleeve is inserted in place. Through the setting of the inner sleeve, the rubber sleeve can be easily inserted into the shaft hole of the inner sleeve with interference fit, and then the inner sleeve with the rubber sleeve is knocked into the sleeve and assembled in place. The provision of a gasket is conducive to the accurate assembly of the inner sleeve in the sleeve, and during use, it can avoid the inner sleeve from rotating with the pump shaft and wearing the sleeve, which is conducive to increasing the service life of the coupling.

[0007] A funnel-shaped through hole is provided on the gasket, and the flared end of the funnel-shaped through hole cooperates with the motor shaft head insertion hole, and the narrowed end of the funnel-shaped through hole is a cylindrical through hole, and the narrowed end cooperates with the pump shaft insertion hole. The setting of the funnel-shaped through hole is convenient for the assembly of the motor shaft head and the pump shaft, and is also conducive to the air squeezed during the assembly of the pump shaft to be discharged toward the motor shaft head insertion hole through the funnel-shaped through hole. More importantly, it is convenient for the assembly of the screw (or bolt) 3, and the head of the screw (or bolt) 3 is sunk into the flared end of the funnel-shaped through hole to avoid contact and friction between the screw (or bolt) 3 and the end of the motor shaft head.

[0008] An inner fold ring is arranged at the inner end of the rubber sleeve, and the inner wall of the inner fold ring is adapted to the inner wall of the constricted end of the funnel-shaped through hole. During assembly, the end of the pump shaft contacts the inner fold ring, and the inner fold ring can absorb the amplitude of the axial movement of the pump shaft to a certain extent, so that the pump can run more smoothly, reduce noise, and is also conducive to protecting the coupling and the pump shaft.

[0009] An inner concave ring is provided at the upper end of the inner sleeve, and the inner concave ring is connected and matched with the axial hole of the inner sleeve. A receiving convex ring is provided at the outer end of the rubber sleeve, and the receiving convex ring matches with the inner concave ring. The axial thickness of the receiving convex ring is adapted to the axial depth of the inner concave ring. The rubber sleeve is provided with a receiving convex ring (i.e., the outer end of the rubber sleeve is thickened), so that the thickness of the outer end of the rubber sleeve is increased, which is convenient for the assembly of the pump shaft, and is also beneficial to prevent the rubber sleeve from being damaged during the assembly of the pump shaft, and is beneficial to keep the integrity of the rubber sleeve. During use, it is inevitable that the pump shaft will jump. The maximum amplitude of the pump shaft jump is located at the end of the coupling, that is, corresponding to the outer end of the rubber sleeve. The rubber sleeve with a receiving convex ring can better absorb the jump, and is also beneficial to prevent the rubber sleeve from being damaged during the jumping process, which is beneficial to increase the service life of the rubber sleeve.

[0010] In order to facilitate assembly, an outer wall portion of the outer end of the inner sleeve is provided with an outer chamfer, and an inner chamfer is provided on an end of the sleeve corresponding to the pump shaft, and the outer chamfer and the inner chamfer are provided in a coordinated manner.

[0011] The inner wall and the outer wall of the inner end of the inner sleeve are both provided with inner sleeve chamfers.

[0012] The outer walls of both ends of the gasket are provided with gasket chamfers.

[0013] The inner wall of the motor shaft head insertion hole is provided with a spline structure.

[0014] The present invention has the following beneficial effects: 1. Changing the coupling structure is conducive to absorbing the eccentricity of the pump shaft and the motor shaft head, so that the pump shaft and the motor shaft head remain coaxial, improving the problem of the pump shaft being broken due to eccentric rotation, extending the service life of the pump shaft, and reducing the maintenance rate and use cost. 2. A rubber sleeve is arranged in the coupling, and the pump shaft is inserted into the rubber sleeve. The eccentricity between the motor shaft head and the pump shaft is absorbed by the elastic deformation of the rubber sleeve, so that the motor shaft head and the pump shaft can remain coaxial, reducing or even avoiding the possibility of the pump shaft breaking at the connector, and improving the service life of the pump shaft. 3. During assembly, the end of the pump shaft contacts the inner folding ring of the rubber sleeve, and the inner folding ring can absorb the amplitude of the axial stringing of the pump shaft to a certain extent, so that the pump can run more smoothly, reduce noise, and is also conducive to protecting the coupling and the pump shaft. 4. A receiving convex ring is arranged at the outer end of the rubber sleeve, so that the thickness of the outer end of the rubber sleeve is increased, which is convenient for the assembly of the pump shaft, and is also conducive to preventing the rubber sleeve from being damaged during the assembly of the pump shaft, and is conducive to maintaining the integrity of the rubber sleeve. During use, the pump shaft will inevitably jump. The maximum amplitude of the pump shaft jumps is located at the end of the coupling, which corresponds to the outer end of the rubber sleeve. The receiving convex ring rubber sleeve can better absorb the jump, which is also beneficial for the rubber sleeve to avoid damage during the jumping process and increase the service life of the rubber sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0017] Figure 3 It is a schematic diagram of an explosion structure of the present invention.

[0018] Figure 4 It is a schematic diagram of the exploded structure of the coupling in the present invention from another perspective. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0020] Example: Figure 1-4 As shown, the pump with a modified coupling structure includes a coupling 2 arranged at the end of a pump shaft 1, and the coupling connects the pump shaft and the motor shaft head. The coupling includes a sleeve 21 and a rubber sleeve 22 fixed in the sleeve, one end of the sleeve is provided with a motor shaft head insertion hole 21-1, and the other end is provided with a pump shaft insertion hole 21-2, the motor shaft head insertion hole and the pump shaft insertion hole are coaxially arranged, the rubber sleeve 22 is inserted into the pump shaft insertion hole 21-2, and the rubber sleeve 22 is interference fit with the shaft end of the pump shaft 1. Changing the coupling structure is conducive to absorbing the eccentricity of the pump shaft and the motor shaft head, so that the pump shaft and the motor shaft head remain coaxial, improve the problem of the pump shaft breaking due to eccentric rotation, extend the service life of the pump shaft, and reduce the maintenance rate and use cost. Specifically, a rubber sleeve is arranged in the coupling, and the pump shaft is inserted into the rubber sleeve. The eccentricity between the motor shaft head and the pump shaft is absorbed by the elastic deformation of the rubber sleeve, so that the motor shaft head and the pump shaft can remain coaxial, reducing or even avoiding the possibility of the pump shaft breaking at the coupling, thereby increasing the service life of the pump shaft.

[0021] In order to facilitate the production of sleeves and to adapt to the size of the motor shaft head and the pump shaft, the coupling is composed of multiple parts: a step ring is arranged in the sleeve, the step ring is located between the pump shaft insertion hole and the motor shaft head insertion hole, the step surface 21-3 of the step ring is located in the pump shaft insertion hole, a gasket 23 and an inner sleeve 24 are arranged in the pump shaft insertion hole, the gasket (usually made of stainless steel) is placed on the step surface, the inner end of the inner sleeve abuts on the gasket, an interference fit is formed between the inner sleeve and the sleeve, and the rubber sleeve 22 is arranged in the shaft hole of the inner sleeve 24 in an interference fit. Since the rubber sleeve has a certain elastic deformation capacity, when the rubber sleeve directly interferes with the sleeve, it is difficult for the rubber sleeve to be inserted into the sleeve, or it is difficult to ensure that the rubber sleeve is inserted in place. Through the setting of the inner sleeve, the rubber sleeve can be easily inserted into the shaft hole of the inner sleeve with an interference fit, and then the inner sleeve with the rubber sleeve is knocked into the sleeve to be assembled in place. The provision of a gasket is conducive to the accurate assembly of the inner sleeve in the sleeve, and during use, it can prevent the inner sleeve from rotating with the pump shaft and wearing the sleeve, which is conducive to increasing the service life of the coupling. In addition, the provision of the gasket facilitates the screw (or bolt) 3 to form a detachable connection between the pump shaft and the coupling.

[0022] The gasket 23 is provided with a funnel-shaped through hole 23-1, the flared end of the funnel-shaped through hole matches with the motor shaft head insertion hole, and the shrunken end of the funnel-shaped through hole is a cylindrical through hole, and the shrunken end matches with the pump shaft insertion hole. The setting of the funnel-shaped through hole is convenient for the assembly of the motor shaft head and the pump shaft, and is also conducive to the air squeezed during the assembly of the pump shaft to be discharged toward the motor shaft head insertion hole through the funnel-shaped through hole. More importantly, it is convenient for the assembly of the screw (or bolt) 3, and the head of the screw (or bolt) 3 is sunk into the flared end of the funnel-shaped through hole.

[0023] An inner fold ring 22-1 is provided at the inner end of the rubber sleeve, and the inner wall of the inner fold ring is adapted to the inner wall of the constricted end of the funnel-shaped through hole (i.e., the inner hole diameter of the inner fold ring 22-1 is adapted to the diameter of the constricted end of the funnel-shaped through hole). During assembly, the end of the pump shaft contacts the inner fold ring, and the inner fold ring can absorb the amplitude of the axial string movement of the pump shaft to a certain extent, so that the pump can run more smoothly, reduce noise, and is also beneficial to protect the coupling and the pump shaft. The inner hole size of the inner fold ring 22-1 is convenient for the screw (or bolt) 3 to pass through.

[0024] The upper end of the inner sleeve is provided with an inner concave ring 24-1, which is connected and matched with the axial hole of the inner sleeve. The outer end of the rubber sleeve is provided with a receiving convex ring 22-2, which is matched with the inner concave ring, and the axial thickness of the receiving convex ring is adapted to the axial depth of the inner concave ring. The rubber sleeve is provided with a receiving convex ring (i.e., the outer end of the rubber sleeve is thickened), so that the thickness of the outer end of the rubber sleeve is increased, which is convenient for the assembly of the pump shaft, and is also conducive to preventing the rubber sleeve from being damaged during the assembly of the pump shaft, which is conducive to maintaining the integrity of the rubber sleeve. During use, it is inevitable that the pump shaft will jump. The maximum amplitude of the pump shaft jump is located at the end of the coupling, that is, corresponding to the outer end of the rubber sleeve. The rubber sleeve with a receiving convex ring can better absorb the jump, which is also conducive to preventing the rubber sleeve from being damaged during the jump process, and is conducive to increasing the service life of the rubber sleeve.

[0025] In order to facilitate assembly, an outer wall portion of the outer end of the inner sleeve is provided with an outer chamfer 24-2, and an inner chamfer 22-3 is provided on one end of the sleeve corresponding to the pump shaft, and the outer chamfer and the inner chamfer are provided in coordination.

[0026] The inner wall and the outer wall of the inner end of the inner sleeve are both provided with inner sleeve chamfers.

[0027] The outer walls of both ends of the gasket are provided with gasket chamfers.

[0028] The inner wall of the motor shaft head insertion hole is provided with a spline structure 21-3. The spline structure is used to cooperate with the spline of the motor shaft head.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. In the above embodiments, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump with a modified coupling structure, comprising a coupling arranged at the end of a pump shaft, wherein the coupling connects the pump shaft and the motor shaft head, and is characterized in that The coupling comprises a sleeve and a rubber sleeve fixed in the sleeve, one end of the sleeve is provided with a motor shaft head insertion hole, and the other end is provided with a pump shaft insertion hole, the motor shaft head insertion hole and the pump shaft insertion hole are coaxially arranged, the rubber sleeve is inserted into the pump shaft insertion hole, and the rubber sleeve is interference fit with the shaft end of the pump shaft; A step ring is arranged in the sleeve, the step ring is located between the pump shaft insertion hole and the motor shaft head insertion hole, the step surface of the step ring is located in the pump shaft insertion hole, a gasket and an inner sleeve are arranged in the pump shaft insertion hole, the gasket is placed on the step surface, the inner end of the inner sleeve abuts against the gasket, an interference fit is formed between the inner sleeve and the sleeve, and the rubber sleeve is arranged in the shaft hole of the inner sleeve in an interference fit; An inner concave ring is arranged at the upper end of the inner sleeve, and the inner concave ring is communicated and matched with the axial hole of the inner sleeve. A receiving convex ring is arranged at the outer end of the rubber sleeve, and the receiving convex ring is matched with the inner concave ring. The axial thickness of the receiving convex ring is adapted to the axial depth of the inner concave ring. The outer wall portion of the outer end of the inner sleeve is provided with an outer chamfer, and the sleeve is provided with an inner chamfer corresponding to one end of the pump shaft, and the outer chamfer and the inner chamfer are provided in coordination; The inner wall of the motor shaft head insertion hole is provided with a spline structure.

2. The pump with a modified coupling structure according to claim 1, characterized in that The gasket is provided with a funnel-shaped through hole, the expanded end of the funnel-shaped through hole cooperates with the motor shaft head insertion hole, the contracted end of the funnel-shaped through hole is a cylindrical through hole, and the contracted end cooperates with the pump shaft insertion hole.

3. The pump with a modified coupling structure according to claim 2, characterized in that An inner folding ring is arranged at the inner end of the rubber sleeve, and the inner wall of the inner folding ring is adapted to the inner wall of the shrinking end of the funnel-shaped through hole.

4. The pump with a modified coupling structure according to claim 1, characterized in that The inner wall and the outer wall of the inner end of the inner sleeve are both provided with inner sleeve chamfers.

5. The pump with a modified coupling structure according to claim 1, characterized in that The outer walls of both ends of the gasket are provided with gasket chamfers.

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