Permanent magnet air compressor head

Abstract

The utility model provides a permanent magnet air compressor head, and belongs to the field of air compression equipment. The problem that an existing machine head is large in occupied space is solved. The permanent magnet air compressor head comprises a motor and a box body which are arranged front and back, at least two air cylinders are evenly distributed on the periphery of the box body in the circumferential direction, a crank connecting rod assembly used for driving the air cylinders to operate is arranged in the box body, the crank connecting rod assembly comprises a crank horizontally and rotatably arranged in the box body, the front end of the crank extends out of the box body, and the motor is an outer rotor motor. The outer rotor motor is composed of a stator assembly fixed on the box body and a rotor assembly arranged outside the stator assembly, the rotor assembly is composed of a cylindrical rotor frame and a circle of magnetic steel arranged in the rotor frame, and the front end of the crank extends into the stator assembly and is fixedly connected with the rotor frame. The permanent magnet air compressor head is small in occupied space.

Description

Technical Field

[0001] The utility model belongs to the field of air compression equipment, and relates to a permanent magnet air compressor, in particular to a permanent magnet air compressor head. Background Art

[0002] The permanent magnet air compressor head is an important component in the air compressor. It is mainly responsible for compressing the outlet gas into high-pressure gas and is the power source of the air compressor.

[0003] The existing head, such as a three-cylinder oil-free piston air compressor (application number: 201920110848.8) disclosed in the Chinese patent database, includes a crankcase, a drive shaft, cylinders, and piston connecting rod groups. The drive shaft is a crankshaft or a component equivalent to a crankshaft, and is arranged in the crankcase. There are three cylinders, and there are three groups of piston connecting rod groups. The three cylinders are arranged at an angle of 120° to each other and staggered on the circumferential outer surface of the same crankcase. A group of piston connecting rod groups is arranged in each cylinder, and the connecting rod of each group of piston connecting rod groups extends into the crankcase. One end of each connecting rod is connected to the drive shaft. It also includes an electric motor, and the drive shaft is connected to the power output shaft of the electric motor.

[0004] In the above air compressor, the electric motor and the crankcase are distributed along the axial direction of the electric motor, and the motor has a certain length, resulting in the overall air compressor being relatively long and occupying a large space. Summary of the Utility Model

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose a permanent magnet air compressor head with a compact structure.

[0006] The permanent magnet air compressor head includes a motor and a box body arranged front and back. At least two cylinders are evenly distributed on the circumferential outer surface of the box body. A crank connecting rod assembly for driving the cylinders to operate is arranged in the box body. The crank connecting rod assembly includes a crank rotatably arranged horizontally in the box body, and the front end of the crank extends out of the box body. It is characterized in that the type of the motor is an outer rotor motor, and the outer rotor motor is composed of a stator assembly fixed on the box body and a rotor assembly arranged outside the stator assembly. The rotor assembly is composed of a cylindrical rotor frame and a ring of magnetic steel arranged in the rotor frame. The front end of the crank is a straight shaft portion, and the straight shaft portion extends into the stator assembly and is fixedly connected to the above-mentioned rotor frame.

[0007] The motor uses an outer rotor motor, which is not only convenient for installation, but also the outer rotor motor itself is designed compactly, so as to effectively reduce the space it occupies and reduce the space occupied by the head.

[0008] Meanwhile, the front end of the crank directly extends into the stator assembly and is fixedly connected to the rotor bracket, so that the front end of the crank replaces the motor rotor shaft. That is, in this application, the crank and the rotor shaft are the same component, which further shortens the distance between the motor and the box body, makes the head structure more compact, and reduces the space occupation.

[0009] In the above-mentioned permanent magnet air compressor head, an axial flow fan blade coaxial with the motor is arranged outside the above-mentioned rotor bracket, and the cylinder is arranged opposite to the axial flow fan blade so that the wind energy generated by the axial flow fan blade can directly blow towards the cylinder, effectively accelerating the heat dissipation of the cylinder, improving the head life and working stability.

[0010] In the above-mentioned permanent magnet air compressor head, the axial flow fan blade includes an annular base body and a circle of blades integrally formed on the outer wall of the base body, and the front end of the rotor bracket is the above-mentioned base body. That is, in this application, the axial flow fan blade and the rotor bracket are an integral part, which not only facilitates processing and assembly, but also is beneficial to the stable rotation of the axial flow fan blade and enhances the heat dissipation effect.

[0011] In the above-mentioned permanent magnet air compressor head, a shaft sleeve coaxial with the crank is arranged inside the stator assembly. The rear end of the shaft sleeve is sleeved and fixed on the straight shaft part, and the front end of the shaft sleeve is fixedly connected to the rotor bracket. The crank is fixedly connected to the rotor bracket by means of the shaft sleeve, which is convenient for the design and processing of the rotor bracket.

[0012] In the above-mentioned permanent magnet air compressor head, the outer wall of the front end of the straight shaft part and the inner wall of the rear end of the shaft sleeve are in close contact and cooperation through a conical surface, so as to effectively strengthen the coaxiality of the connection between the crank and the shaft sleeve, and improve the operation stability and accuracy of the head.

[0013] Compared with the prior art, the permanent magnet air compressor head has the following advantages:

[0014] 1. The motor adopts an outer rotor motor, which is not only convenient for installation, but also the outer rotor motor itself is designed compactly, effectively reducing the space it occupies, shrinking the shell volume, and reducing the space occupied by the head.

[0015] 2. The front end of the crank directly extends into the stator assembly and is fixedly connected to the rotor bracket, so that the front end of the crank replaces the motor rotor shaft. That is, in this application, the crank and the rotor shaft are the same component, which further shortens the distance between the motor and the box body, makes the head structure more compact, and reduces the space occupation. Brief Description of the Drawings

[0016] Figure 1 is a three-dimensional schematic diagram of the permanent magnet air compressor head.

[0017] Figure 2 is a three-dimensional schematic diagram of the permanent magnet air compressor head in another direction.

[0018] Figure 3 is a cross-sectional schematic diagram of the permanent magnet air compressor head.

[0019] In the figure, 1 is the box body; 2 is the cylinder; 3 is the crank; 3a is the straight shaft part; 4 is the connecting rod; 5 is the motor; 5a is the stator assembly; 5b is the rotor frame; 6 is the axial flow fan blade; 6a is the blade; 7 is the shaft sleeve. Specific embodiments

[0020] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0021] As Figures 1 to 3 shown, the permanent magnet air compressor head of the present invention includes a motor 5 and a box body 1 arranged front and back. At least two cylinders 2 are circumferentially and evenly distributed on the outer periphery of the box body 1. A crank connecting rod assembly for driving the operation of the cylinders 2 is provided in the box body 1. The crank connecting rod assembly includes a crank 3 horizontally rotatably arranged in the box body 1 and a connecting rod 4 arranged on the crank 3. Among them, the number of the connecting rods 4 is the same as that of the cylinders 2 and the positions correspond one by one; the front end of the crank 3 is a straight shaft part 3a, and the straight shaft part 3a extends out of the box body 1. In this embodiment, the number of the cylinders 2 is 3, that is, at this time, the type of this air compressor is a three-cylinder air compressor.

[0022] Specifically,

[0023] As Figure 1 and Figure 3 shown, the type of the motor 5 is an outer rotor motor, and the outer rotor motor is composed of a stator assembly 5a fixed on the box body 1 and a rotor assembly arranged outside the stator assembly 5a. Among them, the structure of the stator assembly 5a is the prior art and will not be elaborated here. The rotor assembly is composed of a cylindrical rotor frame 5b and a ring of magnetic steel arranged inside the rotor frame 5b. The straight shaft part 3a extends into the stator assembly 5a and is fixedly connected to the above-mentioned rotor frame 5b.

[0024] The motor 5 adopts an outer rotor motor, which is not only convenient for installation, but also the outer rotor motor itself is designed compactly, so as to effectively reduce the space it occupies and reduce the space occupied by the head.

[0025] At the same time, the front end of the crank 3 directly extends into the stator assembly 5a and is fixedly connected to the rotor frame 5b, so that the front end of the crank 3 replaces the rotor shaft of the motor 5, that is, in this application, the crank 3 and the rotor shaft are the same component, so as to further shorten the distance between the motor 5 and the box body 1, make the structure of the head more compact, and reduce the space occupation.

[0026] Further explanation, an axial flow fan blade 6 coaxial with the motor 5 is arranged outside the rotor frame 5b, and the rotor frame 5b drives the axial flow fan blade 6 to rotate. The cylinders 2 are arranged opposite to the axial flow fan blade 6 so that the wind energy generated by the axial flow fan blade 6 can directly blow to the cylinders 2, so as to effectively accelerate the heat dissipation of the cylinders 2 and improve the service life and working stability of the head.

[0027] Among them,

[0028] The installation method of the axial flow fan blade 6 is as follows: The axial flow fan blade 6 includes an annular base body and a circle of blades 6a integrally formed on the outer wall of the base body, and the front end of the rotor frame 5b is the above-mentioned base body. That is, in this application, the axial flow fan blade 6 and the rotor frame 5b are an integral part, which is not only convenient for processing and assembly, but also conducive to the stable rotation of the axial flow fan blade 6 and enhances the heat dissipation effect.

[0029] As Figure 1 and Figure 3 shown, the connection method of the crank 3 and the rotor frame 5b is as follows: A shaft sleeve 7 coaxially arranged with the crank 3 is provided in the stator assembly 5a. The rear end of the shaft sleeve 7 is sleeved and fixed on the straight shaft portion 3a, and the front end of the shaft sleeve 7 is fixedly connected to the rotor frame 5b. The crank 3 is fixedly connected to the rotor frame 5b by means of the shaft sleeve 7, which is convenient for the design and processing of the rotor frame 5b. Preferably, the front end of the shaft sleeve 7 is fixedly connected to the rotor frame 5b through a flange. Further explanation, the outer wall of the front end of the straight shaft portion 3a and the inner wall of the rear end of the shaft sleeve 7 are in close contact and cooperation through a conical surface to effectively enhance the coaxiality of the connection between the crank 3 and the shaft sleeve 7 and improve the operation stability and accuracy of the machine head. In actual products, the shaft sleeve 7 and the crank 3 are fixedly connected by bolts.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A permanent magnet air compressor head, comprising a motor (5) and a housing (1) arranged front and rear, at least two cylinders (2) being evenly distributed on the outer circumference of the housing (1), a crank-connecting rod assembly for driving the cylinders (2) to operate being provided in the housing (1), the crank-connecting rod assembly comprising a crank (3) rotatably arranged in the housing (1), the front end of the crank (3) extending out of the housing (1), characterized in that: The motor (5) is an external rotor motor, which is composed of a stator assembly (5a) fixed on a housing (1) and a rotor assembly arranged outside the stator assembly (5a), the rotor assembly being composed of a cylindrical rotor frame (5b) and a circle of magnetic steel arranged inside the rotor frame (5b), and the front end of the crank (3) is a straight shaft portion (3a), which extends into the stator assembly (5a) and is fixedly connected to the rotor frame (5b).

2. The permanent magnet air compressor head according to claim 1, characterized in that: An axial flow fan blade (6) coaxial with the motor (5) is arranged outside the rotor frame (5b), and the cylinder (2) is arranged directly opposite to the axial flow fan blade (6) so that the wind energy generated by the axial flow fan blade (6) is directly blown toward the cylinder (2).

3. The permanent magnet air compressor head according to claim 2, characterized in that: The axial flow fan blade (6) comprises an annular base and a circle of blades (6a) integrally formed on the outer wall of the base, and the front end of the rotor frame (5b) is the above-mentioned base.

4. The permanent magnet air compressor head according to claim 1, 2 or 3, characterized in that: A shaft sleeve (7) coaxially arranged with the crank (3) is provided in the stator assembly (5a); the rear end of the shaft sleeve (7) is sleeved and fixed on the straight shaft portion (3a); and the front end of the shaft sleeve (7) is fixedly connected to the rotor frame (5b).

5. The permanent magnet air compressor head according to claim 4, characterized in that: The front end outer wall of the straight shaft portion (3a) and the rear end inner wall of the shaft sleeve (7) are in tight contact and fit via a conical surface.

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