External rotor motor of air compressor

Abstract

The utility model provides an external rotor motor of an air compressor, and belongs to the field of air compression equipment. The problem that an existing motor is inconvenient to assemble is solved. The external rotor motor of the air compressor comprises an axial-flow fan blade, a machine barrel, a stator assembly arranged in the machine barrel and a rotor shaft rotationally matched with the stator assembly, a circle of magnetic steel is fixed on the inner wall of the machine barrel, and the axial-flow fan blade is composed of an inner ring, an outer ring and a circle of blades arranged between the inner ring and the outer ring. The machine barrel comprises a barrel-shaped main body of which the axial section of the barrel wall is approximately L-shaped, the barrel-shaped main body consists of a front barrel body and a rear ring body formed on the inner wall of the rear end of the front barrel body, and the magnetic steel is fixed in the front barrel body; an inner ring is arranged at the rear end of the front barrel, and the axial-flow fan blades and the machine barrel are integrally formed by adopting the same material; a connecting ring coaxial with the machine barrel is integrally formed at the front end of the rear ring body, and the rear end of the rotor shaft is inserted into the connecting ring and fixed with the connecting ring. The external rotor motor of the air compressor is convenient to assemble.

Description

Technical Field

[0001] The utility model belongs to the field of air compression equipment and relates to an air compressor, in particular to an outer rotor motor of an air compressor. Background Art

[0002] The motor is an important component of the air compressor. In order to reduce the size of the air compressor and increase its performance, a certain type of air compressor currently uses an external rotor motor.

[0003] Existing air compressor outer rotor motors, such as a fully oil-free scroll air compressor outer rotor motor disclosed in the China Patent Library (application number: 201620802165.5), are assembled on the main shaft of the fully oil-free scroll air compressor and driven by a controller. The outer rotor motor includes a rotor component and a stator component. The rotor component is mounted on the main shaft and placed inside the volute. The stator component is mounted on the end face of the volute. The rotor component and the stator component engage to form an air compression chamber. The rotor component includes a fan assembly, a rotor disc, a magnetic ring, a permanent magnet and a bushing. The bushing is nested on the main shaft of the air compressor. Permanent magnets and magnetic rings are sequentially arranged on the outside of the bushing. The rotor disc is covered on the outside of the magnetic ring. A number of small holes for circulating air are opened on the rotor disc. The fan assembly is arranged on the back side of the rotor disc.

[0004] In the above-mentioned motor, the fan assembly and the rotor disc are fixedly connected by a circle of fasteners, which greatly increases the assembly steps and makes the motor assembly complicated. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and to provide an air compressor outer rotor motor that is easy to assemble.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an air compressor external rotor motor, comprising an axial fan blade, a barrel, a stator assembly arranged in the barrel and a rotor shaft rotatably matched with the stator assembly, a circle of magnetic steel is fixed on the inner wall of the barrel, and the axial fan blade consists of an inner ring, an outer ring and a circle of blades arranged between the inner ring and the outer ring, characterized in that the barrel includes a cylindrical main body with an axial cross-section of the barrel wall that is roughly L-shaped, the cylindrical main body consists of a front barrel body and a rear ring body formed on the inner wall of the rear end of the front barrel body, and the above-mentioned magnetic steel is fixed in the front barrel body; the rear end of the front barrel body is the above-mentioned inner ring, and the axial fan blade and the barrel are integrally formed with the same material; the front end of the rear ring body is integrally formed with a connecting ring coaxial with the barrel, the rear end of the rotor shaft is inserted into the connecting ring and the two are fixed together.

[0007] The axial flow fan blades and the barrel are integrally formed of the same material, that is, the axial flow fan blades and the barrel are an integrated structure, which can reduce the number of parts required for assembly, shorten the assembly process, and make the assembly of the outer rotor motor more convenient and easy.

[0008] In the above-mentioned air compressor outer rotor motor, the above-mentioned axial flow fan blades and barrel are integrally formed by casting, that is, the axial flow fan blades and barrel are both metal parts, which effectively strengthens the connection strength between the two and ensures stable operation of the outer rotor motor.

[0009] In the aforementioned air compressor outer rotor motor, a circle of ventilation holes is axially penetrated through the rear ring. When the axial fan blades rotate at high speed, some air will enter the motor through the ventilation holes, accelerating the heat dissipation of the motor, improving the motor life and operating stability.

[0010] In the above-mentioned air compressor outer rotor motor, the ventilation port is a fan-shaped structure coaxial with the barrel, so as to effectively expand the ventilation port area and further enhance the heat dissipation of the motor.

[0011] In the aforementioned air compressor external rotor motor, the rear end of the rotor shaft is formed with a tapered surface (1), whose diameter gradually decreases from front to back. The inner wall of the connecting ring is formed with a tapered surface (2), which mates with and rests against the first. These two surfaces work together to forcibly correct the relative position of the connecting ring and the rotor shaft, maintaining high coaxiality between the rotor shaft and the barrel, and improving the motor's operating stability and precision.

[0012] In the aforementioned air compressor outer rotor motor, a ring-shaped stopper is formed on the outer wall of the rotor shaft. The stopper is coaxial with the rotor shaft and presses against the front end of the connecting ring. The stopper not only increases the contact area between the connecting ring and the rotor shaft, but also limits the length of the rotor shaft that extends into the connecting ring, ensuring a stable connection between the connecting ring and the rotor shaft.

[0013] In the aforementioned air compressor external rotor motor, the stator assembly includes a frame, which comprises a stator frame and an end cap fixed to the front of the stator frame. The end cap has a central hole extending from front to back, through which the rotor shaft passes, and the rotor shaft and the end cap rotate in engagement. This design facilitates motor installation and positioning.

[0014] Compared with the existing technology, this air compressor outer rotor motor has the following advantages:

[0015] 1. The axial flow fan blades and the barrel are integrally formed with the same material. That is, the axial flow fan blades and the barrel are an integrated structure. This can reduce the number of parts required for assembly, shorten the assembly process, and make the assembly of the outer rotor motor more convenient and easy.

[0016] 2. When the axial fan blades rotate at high speed, part of the wind will enter the motor through the vents to speed up the heat dissipation of the motor, thereby improving the motor life and working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the outer rotor motor of this air compressor.

[0018] Figure 2 It is a cross-sectional schematic diagram of the outer rotor motor of this air compressor.

[0019] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0020] In the figure, 1. Axial fan blade; 1a. Outer ring; 1b. Blade; 2. Cylinder; 2a. Front cylinder; 2b. Rear ring; 2b1. Ventilation port; 2c. Connecting ring; 3. Stator assembly; 3a. End cover; 4. Rotor shaft; 4a. Conical surface 1; 4b. Limit seat; 5. Magnet; 6. Bearing; 7. Screw. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1 As shown, the outer rotor motor of the air compressor includes an axial flow fan blade 1, a barrel 2, a stator assembly 3 arranged in the barrel 2 and a rotor shaft 4 rotatably matched with the stator assembly 3.

[0023] in,

[0024] A circle of magnetic steel 5 is fixed on the inner wall of the barrel 2; the axial flow fan blade 1 is composed of an inner ring, an outer ring 1a and a circle of blades 1b arranged between the inner ring and the outer ring 1a.

[0025] like Figure 2 As shown, the barrel 2 comprises a cylindrical body with a roughly L-shaped axial cross-section. This body consists of a front barrel 2a and a rear ring 2b formed on the rear inner wall of the front barrel 2a. The rear ring 2b is coaxial with the front barrel 2a, and the aforementioned magnetic steel 5 is fixed to the inner wall of the front barrel 2a. The rear end of the front barrel 2a serves as the aforementioned inner ring, and the axial flow impeller 1 and barrel 2 are integrally formed from the same material. A connecting ring 2c, coaxial with the barrel 2, is integrally formed at the front end of the rear ring 2b. The rear end of the rotor shaft 4 is inserted into the connecting ring 2c, securing the rotor shaft 4 to the barrel 2.

[0026] The axial flow fan blades 1 and the barrel 2 are integrally formed of the same material, that is, the axial flow fan blades 1 and the barrel 2 are an integrated structure, which can reduce the number of parts required for assembly, shorten the assembly process, and make the assembly of the outer rotor motor more convenient and easy.

[0027] In this embodiment,

[0028] The axial-flow fan blades 1 and the barrel 2 are both cast iron parts, and the axial-flow fan blades 1 and the barrel 2 are integrally formed by casting to effectively enhance the connection strength between the two and ensure stable operation of the outer rotor motor.

[0029] The basic structure of stator assembly 3 is similar to that of existing external rotor motors, with the following differences: stator assembly 3 comprises a frame, which includes a stator frame and an end cap 3a fixed to the front of the stator frame. End cap 3a has a central hole extending from front to back, through which rotor shaft 4 passes, and the rotor shaft 4 and end cap 3a rotate in engagement. Bearing 6 is located within the central hole, aligning the rotor shaft 4 with the end cap 3a. The stator frame and end cap 3a are coaxially arranged, with the front end of the stator frame pressing against the rear end of the end cap 3a. The two are secured together by a single ring of bolts.

[0030] like Figure 2 and Figure 3 As shown, the connection between the connecting ring 2c and the rotor shaft 4 is as follows: the connecting ring 2c and the rotor shaft 4 are fixedly connected via screws 7. Specifically, the rear end outer surface of the rotor shaft 4 is formed into a tapered surface 1 4a, the diameter of which gradually decreases from front to back. The inner wall of the connecting ring 2c is formed with a tapered surface 2 that matches tapered surface 1 4a, and tapered surface 1 4a is tightly attached to tapered surface 2. The combination of tapered surface 1 4a and tapered surface 2 is used to forcibly correct the relative position of the connecting ring 2c and the rotor shaft 4, maintaining a high degree of coaxiality between the rotor shaft 4 and the barrel 2, and improving the operating stability and accuracy of the motor. The inner hole of the connecting ring 2c is a stepped hole, and screws 7 are disposed within the connecting ring 2c. The shank of the screw 7 is screwed into the rotor shaft 4, and the head of the screw 7 is pressed tightly against the inner wall of the connecting ring 2c. Further explanation: a rib block is formed on the conical surface 1 4a, and the length of the rib block extends along the inclination direction of the conical surface 1 4a. A keyway matching the rib block is provided on the conical surface 2. The front end of the keyway is open, and the rib block is inserted into the keyway to strengthen the circumferential fit strength between the rotor shaft 4 and the connecting ring 2c, so that the rotor shaft 4 and the barrel 2 are more stably connected.

[0031] Furthermore, an annular stopper 4b is formed on the outer wall of the rotor shaft 4. This stopper 4b is coaxial with the rotor shaft 4 and presses against the front end of the connecting ring 2c. The stopper 4b increases the contact area between the connecting ring 2c and the rotor shaft 4 while also limiting the length of the rotor shaft 4 that can extend into the connecting ring 2c, ensuring a stable connection between the connecting ring 2c and the rotor shaft 4.

[0032] In actual products, such as Figure 1As shown, the rear ring body 2b is axially penetrated by a circle of vents 2b1. When the axial flow impeller 1 rotates at high speed, some air will enter the motor through the vents 2b1, accelerating motor heat dissipation and improving motor life and operating stability. Preferably, the vents 2b1 are fan-shaped and coaxial with the barrel 2 to effectively expand the area of the vents 2b1 and further enhance motor heat dissipation.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An air compressor external rotor motor, comprising an axial flow fan blade (1), a barrel (2), a stator assembly (3) arranged in the barrel (2), and a rotor shaft (4) rotatably matched with the stator assembly (3), a circle of magnetic steel (5) fixed on the inner wall of the barrel (2), the axial flow fan blade (1) consisting of an inner ring, an outer ring (1a), and a circle of blades (1b) arranged between the inner ring and the outer ring (1a), characterized in that: The barrel (2) includes a cylindrical body whose axial cross-section of the barrel wall is roughly L-shaped, and the cylindrical body consists of a front barrel (2a) and a rear ring body (2b) formed on the inner wall of the rear end of the front barrel (2a), and the magnetic steel (5) is fixed in the front barrel (2a); the rear end of the front barrel (2a) is the inner ring, and the axial flow fan blade (1) and the barrel (2) are integrally formed with the same material; the front end of the rear ring body (2b) is integrally formed with a connecting ring (2c) coaxial with the barrel (2), and the rear end of the rotor shaft (4) is inserted into the connecting ring (2c) and the two are fixed together.

2. The air compressor outer rotor motor according to claim 1, characterized in that: The axial flow fan blade (1) and the barrel (2) are integrally formed by casting.

3. The air compressor outer rotor motor according to claim 1, characterized in that: A circle of ventilation openings (2b1) is axially penetrated on the rear ring body (2b).

4. The air compressor outer rotor motor according to claim 3, characterized in that: The vent (2b1) is a fan-shaped structure coaxial with the barrel (2).

5. The air compressor outer rotor motor according to claim 1, characterized in that: The outer side surface of the rear end of the rotor shaft (4) is a conical surface 1 (4a), and the diameter of the conical surface 1 (4a) gradually decreases from front to back. The inner wall of the connecting ring (2c) is formed with a conical surface 2 that matches the conical surface 1 (4a), and the conical surface 1 (4a) is tightly attached to the conical surface 2.

6. The air compressor outer rotor motor according to claim 5, characterized in that: An annular limiting seat (4b) is formed on the outer wall of the rotor shaft (4); the limiting seat (4b) is coaxially arranged with the rotor shaft (4), and the limiting seat (4b) is pressed on the front end surface of the connecting ring (2c).

7. The air compressor outer rotor motor according to claim 1, characterized in that: The stator assembly (3) includes a frame, which includes a stator frame and an end cover (3a) fixed to the front side of the stator frame. The end cover (3a) has a center hole extending through the end and back. The rotor shaft (4) is passed through the center hole, and the rotor shaft (4) and the end cover (3a) are rotatably matched.

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