Air compressor capable of preventing motor shaft from moving

Abstract

The utility model provides an air compressor capable of preventing a motor shaft from moving, which is characterized in that a driving mounting port is arranged on a compression cylinder, a first bearing for rotatably mounting a nose end of the motor shaft in the driving mounting port of the compression cylinder is arranged in the driving mounting port, and a second bearing for rotatably mounting the tail end of the motor shaft is arranged on a motor shell; the stator comprises the two arc-shaped magnetic shoes, and the two magnetic shoes are symmetrically arranged by taking the central axis of the motor shaft as the symmetric axis, so that the two magnetic shoes can form a cylindrical magnetic shoe type stator; the distance A between the first near end of the cylindrical magnetic shoe type stator and the second near end of the rotor is greater than the distance B between the first far end of the cylindrical magnetic shoe type stator and the second far end of the rotor, so that the cylindrical magnetic shoe type stator forms an offset structure with misaligned magnetic shoes relative to the axial center position of the rotor; therefore, the electromagnetic force is more concentrated on the motor shaft and the position of the first bearing on the compression cylinder, the motor shaft can be pressed tightly, and the phenomenon that the motor shaft moves in the axial direction is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of air compression equipment, and in particular relates to an air compressor capable of preventing a motor shaft from moving. Background Art

[0002] The air compressor used in the automobile air suspension system compresses the input air to provide high-pressure compressed air, and inputs the compressed air into an air storage tank or an air spring or other air storage container to improve the stability, smoothness and comfort of the car's driving. At present, the air compressor includes a compression cylinder, a piston assembly arranged in the compression cylinder, and a motor that drives the piston assembly to perform piston movement in the compression cylinder. Since the motor shaft of the motor is connected to the piston assembly through a crankshaft mechanism, and the length of the motor shaft is relatively long, in the process of the motor shaft of the motor driving the piston assembly to reciprocate through the crankshaft mechanism, it is easy to cause the motor shaft of the motor to produce axial movement, causing the air compressor to produce an operating failure. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of the embodiments of the utility model is to provide an air compressor that prevents the motor shaft from moving, so as to solve the technical problem in the prior art that the motor shaft of the motor is prone to axial movement during the reciprocating motion of the piston assembly driven by the crankshaft mechanism, thereby causing the air compressor to have an operating failure.

[0004] In order to achieve the above object, the technical solution adopted by the utility model is: to provide an air compressor for preventing the motor shaft from moving, comprising:

[0005] An air compression mechanism comprises a compression cylinder and a piston assembly arranged in the compression cylinder, wherein the compression cylinder is provided with a drive mounting port;

[0006] A motor, used to drive the piston assembly to reciprocate, the motor comprising a motor housing, a stator fixedly disposed in the motor housing, a motor shaft rotatably disposed on the motor housing, and a rotor used to drive the motor shaft to rotate, the rotor being disposed in the stator;

[0007] a first bearing, used for rotatably mounting the nose end of the motor shaft in the drive mounting opening, wherein the outer ring of the first bearing is supported and fixed in the drive mounting opening, and the inner ring of the first bearing is sleeved on the nose end of the motor shaft; and

[0008] A second bearing, used for rotatably mounting the tail end of the motor shaft on the motor housing;

[0009] In which, the stator includes two arc-shaped magnetic tiles, and the two magnetic tiles are symmetrically arranged with the central axis of the motor shaft as the symmetry axis, so that the two magnetic tiles constitute a cylindrical magnetic tile stator, and the cylindrical magnetic tile stator has a first proximal end close to the nose end of the motor shaft and a first distal end close to the tail end of the motor shaft along its axial direction, and the rotor has a second proximal end close to the nose end of the motor shaft and a second distal end close to the tail end of the motor shaft along its axial direction, and the distance A between the first proximal end and the second proximal end is greater than the distance B between the first distal end and the second distal end, so that the cylindrical magnetic tile stator forms an offset structure with misaligned magnetic tiles relative to the axial center position of the rotor.

[0010] Furthermore, the difference between the distance A and the distance B is 1 to 2 mm.

[0011] Furthermore, a distance A between the first proximal end and the second proximal end is 4 to 5 mm, and a distance B between the first distal end and the second distal end is 3 to 4 mm.

[0012] Furthermore, a stopper is provided on the motor shaft near its nose end, and the stopper is held against an end surface of the first bearing facing the cylindrical magnetic tile stator.

[0013] Furthermore, the rotor is sleeved on the center position of the motor shaft, and a distance C between the second proximal end and the nose end of the motor shaft is smaller than a distance D between the second distal end and the tail end of the motor shaft.

[0014] Furthermore, a hole for positioning and installing the first bearing is provided on the compression cylinder and located in the drive installation opening, and the outer ring of the first bearing is fixedly installed in the hole.

[0015] Furthermore, the motor housing includes a cylindrical shell with open ends and an end cover covering the open end of the cylindrical shell, the end cover is provided with a groove for positioning and installing the second bearing, the outer ring of the second bearing is fixedly installed in the groove, and the inner ring of the second bearing is sleeved on the tail end of the motor shaft.

[0016] Furthermore, a plug-in portion with a reduced diameter is formed at the rear end of the motor shaft, and a supporting step is formed at the connection between the plug-in portion with a reduced diameter and the motor shaft, and the supporting step is supported on an end surface of the second bearing facing the cylindrical magnetic shoe stator.

[0017] Furthermore, the first bearing and / or the second bearing is a deep groove ball bearing.

[0018] Furthermore, a first piston cylinder and a second piston cylinder are provided inside the compression cylinder, and the piston assembly includes a first piston slidably disposed in the first piston cylinder, a second piston slidably disposed in the second piston cylinder, and a driving portion connecting the first piston and the second piston, and the driving portion is connected to the nose end of the motor shaft through a crankshaft mechanism.

[0019] Compared with the prior art, the above one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0020] The air compressor for preventing the motor shaft from moving in the embodiment of the utility model is provided with a drive mounting opening on the compression cylinder, a first bearing for rotatably mounting the nose end of the motor shaft in the drive mounting opening of the compression cylinder is provided in the drive mounting opening, and a second bearing for rotatably mounting the tail end of the motor shaft on the motor housing is provided on the motor housing. Since the stator includes two arc-shaped magnetic tiles, the two magnetic tiles are symmetrically arranged with the central axis of the motor shaft as the symmetry axis, so that the two magnetic tiles can constitute a cylindrical magnetic tile stator, and the distance A between the first proximal end of the cylindrical magnetic tile stator and the second proximal end of the rotor is greater than the distance B between the first distal end of the cylindrical magnetic tile stator and the second distal end of the rotor, so that the cylindrical magnetic tile stator forms an offset structure in which the magnetic tiles are not centered relative to the axial center position of the rotor, so that the electromagnetic force is more concentrated on the position of the motor shaft and the first bearing on the compression cylinder, which is conducive to pressing the motor shaft to prevent the motor shaft from moving in the axial direction, thereby preventing the air compressor from having operating failures due to the movement of the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic cross-sectional view of an air compressor for preventing the motor shaft from moving provided by an embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the three-dimensional structure of an air compressor for preventing the motor shaft from moving provided by an embodiment of the utility model;

[0024] Figure 3 A schematic cross-sectional view of a motor provided in an embodiment of the utility model;

[0025] Figure 4 A schematic diagram of the three-dimensional structure of a motor shaft provided in an embodiment of the utility model;

[0026] Figure 5 A schematic diagram of the three-dimensional structure of a compression cylinder provided in an embodiment of the utility model;

[0027] Figure 6 An exploded view of an air compressor for preventing motor shaft movement provided in an embodiment of the utility model.

[0028] Among them, the reference numerals in the figure are:

[0029] 1-air compression mechanism; 11-compression cylinder; 12-piston assembly; 121-first piston; 122-second piston; 123-driving part; 13-cavity; 14-air outlet; 15-air inlet; 16-first piston cylinder; 17-second piston cylinder; 18-driving installation port;

[0030] 2-motor; 21-motor housing; 211-cylindrical housing; 212-end cover; 22-stator; 221-magnetic tile; 222-first proximal end; 223-first distal end; 23-motor shaft; 231-nose end; 232-tail end; 233-holding limiter; 234-plug-in part; 235-holding step; 24-rotor; 241-second proximal end; 242-second distal end; 25-carbon brush assembly; 26-precision positioning ring; 27-enameled wire; 28-commutator;

[0031] 3-first bearing; 4-second bearing; 5-hole; 6-slot; 7-crankshaft mechanism. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be noted that when an element is referred to as being "connected to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically defined. In the description of the utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0035] Please also read Figures 1 to 6The air compressor for preventing the motor shaft from moving provided by the embodiment of the utility model is now described. The air compressor for preventing the motor shaft from moving provided by the embodiment of the utility model comprises an air compression mechanism 1, an air storage container, a motor 2, a first bearing 3 and a second bearing 4. The air compression mechanism 1 comprises a compression cylinder 11 and a piston assembly 12 arranged in the compression cylinder 11. The compression cylinder 11 is provided with an air outlet 14 and an air inlet 15 for introducing external air into the compression cylinder 11. The compression cylinder 11 is provided with a cavity 13 and a drive mounting port 18 communicating with the cavity 13. The air inlet 15 is communicated with the cavity 13. The air storage container is an air storage tank that can be used to store compressed air. The air storage container is communicated with the air outlet 14. The motor 2 is used to drive the piston assembly 12 to reciprocate. The motor 2 includes a motor housing 21, a stator 22 fixedly disposed in the motor housing 21, a motor shaft 23 rotatably disposed on the motor housing 21, and a rotor 24 used to drive the motor shaft 23 to rotate. The rotor 24 is disposed in the stator 22 and sleeved on the motor shaft 23. The motor housing 21 is detachably connected to the compression cylinder 11. The first bearing 3 is used to rotatably mount the nose end 231 of the motor shaft 23 in the drive mounting port 18 of the compression cylinder 11. The outer ring of the first bearing 3 is supported and fixed in the drive mounting port 18 of the compression cylinder 11, and the inner ring of the first bearing 3 is sleeved on the nose end 231 of the motor shaft 23. The second bearing 4 is used to rotatably mount the tail end 232 of the motor shaft 23 on the motor housing 21. The outer ring of the second bearing 4 is supported and fixed on the motor housing 21, and the inner ring of the second bearing 4 is sleeved on the tail end 232 of the motor shaft 23. The stator 22 includes two arc-shaped magnetic tiles 221, and the two magnetic tiles 221 are symmetrically arranged with the central axis of the motor shaft 23 as the symmetry axis, so that the two magnetic tiles 221 constitute a cylindrical magnetic tile type stator, and the cylindrical magnetic tile type stator has a first proximal end 222 close to the nose end 231 of the motor shaft 23 and a first distal end 223 close to the tail end 232 of the motor shaft 23 along its axial direction, and the rotor 24 has a second proximal end 241 close to the nose end 231 of the motor shaft 23 and a distal end 223 close to the tail end 232 of the motor shaft 23 along its axial direction. The distance A between the second distal end 242 and the first proximal end 222 and the second proximal end 241 of the tail end 232 of the motor shaft 23 is greater than the distance B between the first distal end 223 and the second distal end 242, so that the cylindrical magnetic tile stator forms an offset structure in which the magnetic tile 221 is not centered relative to the axial center position of the rotor 24, thereby making the electromagnetic force more concentrated on the position of the motor shaft 23 and the first bearing 3 on the compression cylinder 11, which is beneficial to tighten the motor shaft 23 and prevent the motor shaft 23 from moving in the axial direction.

[0036] Compared with the prior art, the air compressor for preventing the motor shaft from moving provided by the embodiment of the utility model is provided with a driving installation opening 18 on the compression cylinder 11, a first bearing 3 is provided in the driving installation opening 18 for rotatably installing the nose end 231 of the motor shaft 23 in the driving installation opening 18 of the compression cylinder 11, and a second bearing 4 is provided on the motor housing 21 for rotatably installing the tail end 232 of the motor shaft 23 on the motor housing 21. Since the stator 22 includes two arc-shaped magnetic tiles 221, the two magnetic tiles 221 are symmetrically arranged with the central axis of the motor shaft 23 as the symmetry axis, so that the two magnetic tiles 221 can form a cylindrical The cylindrical magnetic tile type stator, plus the distance A between the first proximal end 222 of the cylindrical magnetic tile type stator and the second proximal end 241 of the rotor 24 is greater than the distance B between the first distal end 223 of the cylindrical magnetic tile type stator and the second distal end 242 of the rotor 24, makes the cylindrical magnetic tile type stator form an offset structure in which the magnetic tile 221 is not centered relative to the axial center position of the rotor 24, so that the electromagnetic force is more concentrated on the position of the motor shaft 23 and the first bearing 3 on the compression cylinder 11, which is beneficial to tighten the motor shaft 23 and prevent the motor shaft 23 from moving in the axial direction, thereby preventing the air compressor from having operating failures due to the movement of the motor shaft 23.

[0037] In some of the embodiments, the distance A between the first proximal end 222 of the cylindrical magnetic tile stator and the second proximal end 241 of the rotor 24 is greater than the distance B between the first distal end 223 of the cylindrical magnetic tile stator and the second distal end 242 of the rotor 24, and the difference between the distance A and the distance B is 1 to 2 mm, so that the cylindrical magnetic tile stator forms an offset structure in which the magnetic tile 221 is not centered relative to the axial center position of the rotor 24, so that the electromagnetic force is more concentrated on the position of the motor shaft 23 and the first bearing 3 on the compression cylinder 11, which is beneficial to tighten the motor shaft 23 and prevent the motor shaft 23 from moving in the axial direction, thereby preventing the air compressor from having operating failures due to the movement of the motor shaft 23.

[0038] In some embodiments, the distance A between the first proximal end 222 of the cylindrical magnetic tile stator and the second proximal end 241 of the rotor 24 is 4-5 mm, and the distance B between the first distal end 223 of the cylindrical magnetic tile stator and the second distal end 242 of the rotor 24 is 3-4 mm. Preferably, for example, the distance A between the first proximal end 222 of the cylindrical magnetic tile stator and the second proximal end 241 of the rotor 24 is 4.5 mm, and the distance B between the first distal end 223 of the cylindrical magnetic tile stator and the second distal end 242 of the rotor 24 is 3.5 mm, so that the difference between the distance A and the distance B is 1 mm, so that the cylindrical magnetic tile stator is offset by 1 mm relative to the axial center position of the rotor 24 to form an offset structure in which the magnetic tile 221 is not centered, so that the electromagnetic force is more concentrated on the position of the motor shaft 23 and the first bearing 3 on the compression cylinder 11, which is conducive to pressing the motor shaft 23 and preventing the motor shaft 23 from axially moving, thereby preventing the air compressor from operating failure due to the movement of the motor shaft 23.

[0039] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments, a stopper 233 is provided on the motor shaft 23 near its nose end 231, and the stopper 233 is abutted against one end face of the first bearing 3 facing the cylindrical magnetic tile stator, which is conducive to enhancing the ability of the first bearing 3 to limit the radial movement of the motor shaft 23 and prevent the motor shaft 23 from moving in the axial direction. Specifically, the stopper 233 is a stopper convex ring convexly provided on the outer peripheral surface of the motor shaft 23, and the corresponding end face of the stopper convex ring is held on one end face of the first bearing 3 facing the cylindrical magnetic tile stator, thereby enhancing the balance of the force on the first bearing 3.

[0040] Please refer to Figure 1 and Figure 3 In some embodiments, the rotor 24 is mounted on the center of the motor shaft 23, and a distance C between the second proximal end 241 and the nose end 231 of the motor shaft 23 is smaller than a distance D between the second distal end 242 and the tail end 232 of the motor shaft 23, which is beneficial for pressing the motor shaft 23 and preventing the motor shaft 23 from moving in the axial direction, thereby effectively preventing the air compressor from operating faults due to the movement of the motor shaft 23.

[0041] Please refer to Figure 5 and Figure 6 In some of the embodiments, a hole 5 for positioning and installing the first bearing 3 is provided on the compression cylinder 11 and located in the drive installation port 18. The outer ring of the first bearing 3 is fixedly installed in the hole 5, which is beneficial to enhance the stability of the installation of the first bearing 3, thereby improving the effect of preventing the motor shaft 23 from shaking.

[0042] Please refer to Figure 1 , Figure 2and Figure 3 In some of the embodiments, in order to further prevent the motor shaft 23 from shaking or radially moving, the motor housing 21 includes a cylindrical shell 211 with both ends open and an end cover 212 covering the open end of the cylindrical shell 211. The end cover 212 is provided with a groove 6 for positioning and installing the second bearing 4. The outer ring of the second bearing 4 is fixedly installed in the groove 6, and the inner ring of the second bearing 4 is sleeved on the tail end 232 of the motor shaft 23.

[0043] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments, the tail end 232 of the motor shaft 23 is formed with a plug-in portion 234 with a reduced diameter, and a supporting step 235 is formed at the connection between the plug-in portion 234 and the motor shaft 23. The supporting step 235 is supported on an end surface of the second bearing 4 facing the cylindrical magnetic tile stator, which is beneficial to enhance the ability of the first bearing 3 to limit the radial movement of the motor shaft 23 and prevent the motor shaft 23 from moving in the axial direction.

[0044] Please refer to Figure 6 In some embodiments, the first bearing 3 and / or the second bearing 4 are deep groove ball bearings. The motor 2 further includes a carbon brush assembly 25, a precision positioning ring 26, an enameled wire 27 and a commutator 28. The precision positioning ring 26 and the commutator 28 are sleeved on the motor shaft 23 near its tail end, and the enameled wire 27 is arranged on the rotor 24.

[0045] Please refer to Figure 1 and Figure 6 In some embodiments, the compression cylinder 11 is further provided with a first piston cylinder 16 and a second piston cylinder 17, and the piston assembly 12 includes a first piston 121 slidably disposed in the first piston cylinder 16, a second piston 122 slidably disposed in the second piston cylinder 17, and a driving portion 123 connecting the first piston 121 and the second piston 122, and the driving portion 123 is connected to the nose end 231 of the motor shaft 23 through the crank mechanism 7. When the motor 2 is working, the first piston 121 and the second piston 122 of the air compression mechanism 1, driven by the motor shaft 23 and the crank mechanism 7, respectively perform piston motion in the first piston cylinder 16 and the second piston cylinder 17 to compress the air.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air compressor for preventing motor shaft movement, characterized in that: include: An air compression mechanism comprises a compression cylinder and a piston assembly arranged in the compression cylinder, wherein the compression cylinder is provided with a drive mounting port; A motor, used to drive the piston assembly to reciprocate, the motor comprising a motor housing, a stator fixedly disposed in the motor housing, a motor shaft rotatably disposed on the motor housing, and a rotor used to drive the motor shaft to rotate, the rotor being disposed in the stator; A first bearing, used for rotatably mounting the nose end of the motor shaft in the drive mounting opening, wherein the outer ring of the first bearing is supported and fixed in the drive mounting opening, and the inner ring of the first bearing is sleeved on the nose end of the motor shaft; as well as A second bearing, used for rotatably mounting the tail end of the motor shaft on the motor housing; In which, the stator includes two arc-shaped magnetic tiles, and the two magnetic tiles are symmetrically arranged with the central axis of the motor shaft as the symmetry axis, so that the two magnetic tiles constitute a cylindrical magnetic tile stator, and the cylindrical magnetic tile stator has a first proximal end close to the nose end of the motor shaft and a first distal end close to the tail end of the motor shaft along its axial direction, and the rotor has a second proximal end close to the nose end of the motor shaft and a second distal end close to the tail end of the motor shaft along its axial direction, and the distance A between the first proximal end and the second proximal end is greater than the distance B between the first distal end and the second distal end, so that the cylindrical magnetic tile stator forms an offset structure with misaligned magnetic tiles relative to the axial center position of the rotor.

2. The air compressor for preventing the motor shaft from moving according to claim 1, characterized in that: The difference between the distance A and the distance B is 1 to 2 mm.

3. The air compressor for preventing the motor shaft from moving according to claim 1, characterized in that: A distance A between the first proximal end and the second proximal end is 4 to 5 mm, and a distance B between the first distal end and the second distal end is 3 to 4 mm.

4. The air compressor for preventing the motor shaft from moving according to claim 1, characterized in that: A stopper is provided on the motor shaft near the nose end thereof, and the stopper is held against an end surface of the first bearing facing the cylindrical magnetic shoe stator.

5. The air compressor for preventing the motor shaft from moving according to claim 1, characterized in that: The rotor is sleeved on the center position of the motor shaft, and the distance C between the second proximal end and the nose end of the motor shaft is smaller than the distance D between the second distal end and the tail end of the motor shaft.

6. The air compressor for preventing the motor shaft from moving according to claim 1, characterized in that: A hole for positioning and installing the first bearing is provided on the compression cylinder and located in the drive installation opening, and the outer ring of the first bearing is fixedly installed in the hole.

7. The air compressor for preventing the motor shaft from moving according to claim 1, characterized in that: The motor housing includes a cylindrical shell with open ends and an end cover covering the open end of the cylindrical shell. The end cover is provided with a groove for positioning and installing the second bearing. The outer ring of the second bearing is fixedly installed in the groove, and the inner ring of the second bearing is sleeved on the tail end of the motor shaft.

8. The air compressor for preventing the motor shaft from moving according to claim 7, characterized in that: A plug-in portion with a reduced diameter is formed at the rear end of the motor shaft, and a supporting step is formed at the connection between the plug-in portion with a reduced diameter and the motor shaft. The supporting step is supported on an end surface of the second bearing facing the cylindrical magnetic shoe stator.

9. The air compressor for preventing motor shaft movement according to claim 1, characterized in that: The first bearing and / or the second bearing is a deep groove ball bearing.

10. The air compressor for preventing the motor shaft from moving according to any one of claims 1 to 9, characterized in that: A first piston cylinder and a second piston cylinder are also provided inside the compression cylinder. The piston assembly includes a first piston slidably disposed in the first piston cylinder, a second piston slidably disposed in the second piston cylinder, and a driving portion connecting the first piston and the second piston. The driving portion is connected to the nose end of the motor shaft through a crankshaft mechanism.

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