End cover assembly for oil lubricated air compressor outer rotor motor

Abstract

The utility model provides an end cover assembly of oil -filled air compressor outer rotor motor belongs to mechanical technical field. It solved the problem of inconvenient maintenance of existing outer rotor motor. The end cover assembly of oil -filled air compressor outer rotor motor of present application includes end cover body and the stator support of setting in the end cover body rear side and being the barrel, the inboard wall of stator support is integrally formed with a ring connecting pipe, and the axis of connecting pipe and stator support is parallelly arranged; The rear end surface of end cover body is formed with the connecting portion of ring, and the rear end of connecting portion is inserted into the front end of stator support, and the threaded hole is axially arranged on the rear end of connecting portion, the number of connecting pipe and threaded hole is same and the position is one to one correspondence; The front end surface of connecting pipe is pressed on connecting portion, and the bolt is arranged in each connecting pipe, the head of bolt is pressed on corresponding connecting pipe, and the bolt rod is screwed into corresponding threaded hole. The end cover assembly of oil -filled air compressor outer rotor motor of present application is beneficial to motor maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to an external rotor motor for an oil-lubricated air compressor, and more particularly to an end cover assembly for an external rotor motor for an oil-lubricated air compressor. Background Technology

[0002] Oil-lubricated air compressors are those that require lubrication during operation to reduce friction and wear.

[0003] An existing oil-lubricated air compressor, such as the three-cylinder oil-lubricated air compressor head previously proposed by the applicant (application number: 202411183721.0), includes a housing and three cylinders evenly distributed around the housing. Each cylinder is equipped with a cylinder head. A crank is horizontally installed inside the housing, and the crank drives the three cylinders to rotate through three connecting rods. The front end of the crank extends out of the housing. The machine head is characterized by further including a housing and a motor. The motor and housing are both housed within the housing, and are arranged sequentially back and forth along the crank axis. The motor drives the crank to rotate, and is also equipped with an axial flow fan driven by the motor. The cylinders are positioned directly opposite the axial flow fan so that the air generated by the axial flow fan is directly blown onto the cylinders. The front of the housing... The sides and rear sides are respectively provided with air inlets and air outlets, which are respectively positioned directly opposite the motor and the housing; the rear inner wall of the housing is formed with strip-shaped cavities, and the length of the strip-shaped cavities extends front and rear. There are three strip-shaped cavities, and the front and bottom of the strip-shaped cavities are open. The three cylinder heads are respectively set in the three strip-shaped cavities, and the rear side of the strip-shaped cavities is provided with exhaust ports; the above-mentioned motor type is an external rotor motor, which consists of a stator assembly fixed on the housing and a rotor assembly set outside the stator assembly. The rotor assembly consists of a cylindrical rotor frame and a ring of magnets set inside the rotor frame. The above-mentioned axial flow fan blades are set outside the rotor frame, and the front end of the crank extends into the stator assembly and is fixed to the rotor frame.

[0004] In the actual product, the stator assembly includes an end cover and a stator bracket for supporting the stator core. The end cover is rotatably mounted on the crankshaft via bearings, and the stator bracket is suspended, offering advantages such as simple structure and short length. However, this machine head still has a problem: the end cover and stator bracket are fixed together by a ring of bolts, with the bolt heads located between the housing and the end cover. This means that when disassembling and assembling the stator bracket to maintain the stator assembly, the end cover must be removed first before the bolts can be rotated. However, since the housing is filled with machine oil, the oil must be drained before removing the end cover, making the entire operation rather cumbersome. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing an end cover assembly for an air compressor external rotor motor that is easy to maintain.

[0006] The objective of this utility model can be achieved through the following technical solution: an end cover assembly for an external rotor motor of an oil-cooled air compressor, comprising an end cover body and a cylindrical stator support disposed on the rear side of the end cover body, characterized in that a ring of connecting pipes is integrally formed on the inner side wall of the stator support, and the axes of the connecting pipes and the stator support are parallel; a ring-shaped connecting part is formed on the rear end face of the end cover body, the connecting part and the end cover body are coaxially arranged, the rear end of the connecting part is inserted into the front end of the stator support, and a threaded hole is axially opened on the rear end of the connecting part, the number of connecting pipes and threaded holes are the same and their positions correspond one-to-one; the front end face of the connecting pipe abuts against the connecting part, each connecting pipe is provided with a bolt, the bolt head abuts against the corresponding connecting pipe, and the bolt shank is screwed into the corresponding threaded hole.

[0007] During installation, the stator core is fixed outside the stator bracket; the end cover body is fixed to the air compressor crankcase with screws.

[0008] Connecting pipes for mounting bolts are directly formed inside the stator bracket. This creates a reinforcing rib-like effect to improve the overall strength of the stator bracket and better support the stator core. It also allows bolts to be inserted from back to front, enabling the stator bracket to be disassembled and assembled independently. This avoids the extra operations and troubles caused by removing the end cover body in the existing technology, effectively improving the convenience of motor maintenance.

[0009] In the aforementioned end cover assembly of the external rotor motor of the oil-lubricated air compressor, the inner wall of the connecting part has a raised rib, and the length of the raised rib extends axially along the connecting part. The rear end faces of both the raised rib and the connecting part are flush. The number of raised ribs and threaded holes is the same, and the two sides of the threaded holes are located on the connecting part and the corresponding raised ribs, respectively. By providing a raised rib on the inner wall of the connecting part, and having one side of the threaded hole located on the raised rib, the diameter of the threaded hole can be enlarged, and the strength of the connecting part at the threaded hole can be enhanced, making the connection between the connecting pipe and the connecting part more stable.

[0010] In the aforementioned end cover assembly of the external rotor motor of the oil-lubricated air compressor, the bolt head is positioned close to the rear end face of the stator bracket, making it easier to rotate the bolt and facilitating the disassembly and assembly of the stator bracket.

[0011] In the aforementioned end cover assembly of the external rotor motor of the oil-lubricated air compressor, the inner wall of the stator support is formed with arc blocks between two adjacent connecting pipes. The arc blocks are coaxially arranged with the stator support, and both ends of the arc blocks extend to the outer wall of the corresponding connecting pipes to simultaneously enhance the strength of the stator support and the connecting pipes.

[0012] In the aforementioned end cover assembly of the external rotor motor of the oil-air compressor, the inner hole of the connecting pipe is a stepped hole, which consists of a large hole with a larger diameter and a small hole with a smaller diameter, with the large hole located behind the small hole, and the head of the aforementioned bolt pressing against the bottom wall of the corresponding large hole.

[0013] In the end cover assembly of the external rotor motor of the aforementioned oil-air compressor, at least one arc block has multiple through holes axially penetrating it. The through holes reduce the weight of the stator support and accelerate motor heat dissipation.

[0014] In the aforementioned end cover assembly of the external rotor motor of the oil-air compressor, the stator bracket is a cast integral part.

[0015] Compared with existing technologies, the end cover assembly of the external rotor motor of this oil air compressor has the following advantages:

[0016] 1. Connecting pipes for mounting bolts are directly formed inside the stator bracket. This creates a reinforcing rib-like effect to improve the overall strength of the stator bracket and better support the stator core. It also allows bolts to be inserted from back to front, enabling the stator bracket to be disassembled and assembled independently. This avoids the extra operations and troubles caused by removing the end cover body in the existing technology, effectively improving the convenience of motor maintenance.

[0017] 2. A raised rib is provided on the inner wall of the connecting part, and one side of the threaded hole is set on the raised rib. This can both enlarge the diameter of the threaded hole and enhance the strength of the connecting part at the threaded hole, making the connection between the connecting pipe and the connecting part more stable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the end cap assembly installation.

[0019] Figure 2 This is a three-dimensional schematic diagram of the stator support.

[0020] Figure 3 This is a three-dimensional schematic diagram of the end cap body.

[0021] In the figure, 1. End cap body; 1a. Connecting part; 1b. Threaded hole; 1c. Raised strip; 2. Stator bracket; 2a. Connecting pipe; 2b. Stepped hole; 2b1. Large hole; 2b2. Small hole; 2c. Arc block; 2d. Through hole; 3. Rotor shaft; 4. Bolt. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1As shown, the end cover assembly of the external rotor motor of the oil-cooled air compressor includes an end cover body 1 and a cylindrical stator support 2 located on the rear side of the end cover body 1, with the stator support 2 and the end cover body 1 coaxially arranged. In the actual product, the external rotor motor also includes a rotor shaft 3. The end cover body 1 has a central hole through which the front end of the rotor shaft 3 passes, and a bearing is installed in the central hole to enable rotational engagement between the end cover body 1 and the rotor shaft 3. The stator support 2 is sleeved on the outside of the rotor shaft 3 and is suspended in the air.

[0024] Specifically

[0025] like Figures 1 to 3 As shown, a ring of connecting tubes 2a is integrally formed on the inner wall of the stator support 2, and the ring of connecting tubes 2a is distributed at intervals along the circumference of the stator support 2. In the actual product, there are 3 connecting tubes 2a. The connecting tubes 2a are long tubes, and the axes of the connecting tubes 2a and the stator support 2 are parallel. An annular connecting part 1a is integrally formed on the rear end face of the end cover body 1, and the connecting part 1a and the end cover body 1 are coaxially arranged. The rear end of the connecting part 1a is inserted into the front end of the stator support 2, and a threaded hole 1b is axially opened on the rear end of the connecting part 1a. The number of connecting tubes 2a and the threaded holes 1b are the same and their positions correspond one-to-one. The front end face of the connecting tube 2a presses against the connecting part 1a, and in the actual product, the front end face of the connecting tube 2a presses against the rear end face of the connecting part 1a. Each connecting tube 2a is provided with a bolt 4, the head of the bolt 4 presses against the corresponding connecting tube 2a, and the shank of the bolt 4 is screwed into the corresponding threaded hole 1b. Preferably, the inner hole of the connecting pipe 2a is a stepped hole 2b, which consists of a large hole 2b1 with a larger diameter and a small hole 2b2 with a smaller diameter. The large hole 2b1 is located behind the small hole 2b2, and the head of the bolt 4 presses against the bottom wall of the corresponding large hole 2b1.

[0026] During installation, the stator core is fixed outside the stator bracket 2, and the two are usually fixed together to form a whole by a tight fit. A ring of connecting holes is formed on the front outer wall of the end cover body 1, and the end cover body 1 is fixed to the air compressor crankcase by screws and connecting holes.

[0027] The connecting pipe 2a for mounting bolts 4 is directly formed inside the stator bracket 2. This not only forms a reinforcing rib-like effect to improve the overall strength of the stator bracket 2 and better support the stator core, but also allows the bolts 4 to be inserted from back to front for installation, so that the stator bracket 2 can be disassembled and assembled separately. This avoids the extra operation and trouble caused by removing the end cover body 1 in the prior art, and effectively improves the convenience of motor maintenance.

[0028] Further explanation: The inner wall of the connecting part 1a has a protrusion 1c, and the length of the protrusion 1c extends axially along the connecting part 1a. The rear ends of the protrusion 1c and the connecting part 1a are flush. The number of protrusions 1c and threaded holes 1b is the same, and the two sides of the threaded holes 1b are located on the connecting part 1a and the corresponding protrusions 1c, respectively. By providing the protrusion 1c on the inner wall of the connecting part 1a, and by placing one side of the threaded hole 1b on the protrusion 1c, the diameter of the threaded hole 1b can be enlarged, and the strength of the connecting part 1a at the threaded hole 1b can be enhanced, making the connection between the connecting pipe 2a and the connecting part 1a more stable. Preferably, the front end of the protrusion 1c extends to the end cap body 1.

[0029] like Figure 2 As shown, the inner wall of the stator support 2 has arc blocks 2c formed between adjacent connecting pipes 2a. The arc blocks 2c are coaxially arranged with the stator support 2, and both ends of the arc blocks 2c extend to the outer wall of the corresponding connecting pipes 2a, thereby simultaneously enhancing the strength of the stator support 2 and the connecting pipes 2a. Preferably, at least one arc block 2c has multiple through holes 2d axially penetrating it. The through holes 2d can reduce the weight of the stator support 2 and accelerate the heat dissipation of the motor. Preferably, the front end face of the arc block 2c is flush with the front end face of the connecting pipe 2a, and the arc block 2c also presses against the connecting part 1a.

[0030] In the actual product, the head of bolt 4 is positioned close to the rear end face of stator bracket 2, making it easier to rotate bolt 4 and facilitating the assembly and disassembly of stator bracket 2. Both stator bracket 2 and end cover body 1 are integrally cast parts.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An end cover assembly for an external rotor motor of an oil-lubricated air compressor, comprising an end cover body (1) and a cylindrical stator support (2) disposed on the rear side of the end cover body (1), characterized in that, A ring of connecting tubes (2a) is integrally formed on the inner side wall of the stator support (2), and the axes of the connecting tubes (2a) and the stator support (2) are parallel. A ring-shaped connecting part (1a) is formed on the rear end face of the end cover body (1). The connecting part (1a) and the end cover body (1) are coaxially arranged. The rear end of the connecting part (1a) is inserted into the front end of the stator support (2), and a threaded hole (1b) is axially opened on the rear end of the connecting part (1a). The number of connecting tubes (2a) and threaded holes (1b) are the same and their positions correspond one to one. The front end face of the connecting tube (2a) presses against the connecting part (1a). Each connecting tube (2a) is provided with a bolt (4). The head of the bolt (4) presses against the corresponding connecting tube (2a), and the shank of the bolt (4) is screwed into the corresponding threaded hole (1b).

2. The end cover assembly of the external rotor motor of the oil-lubricated air compressor according to claim 1, characterized in that, The inner wall of the connecting part (1a) has a protrusion (1c), and the length of the protrusion (1c) extends axially along the connecting part (1a); the rear end faces of the protrusion (1c) and the connecting part (1a) are flush, the number of protrusions (1c) and threaded holes (1b) are the same, and the two sides of the threaded holes (1b) are located on the connecting part (1a) and the corresponding protrusion (1c) respectively.

3. The end cover assembly of the external rotor motor of the oil-lubricated air compressor according to claim 1, characterized in that, The head of the bolt (4) is positioned close to the rear end face of the stator bracket (2).

4. The end cover assembly of the external rotor motor of the oil-lubricated air compressor according to claim 1, 2, or 3, characterized in that, The inner wall of the stator support (2) has an arc block (2c) formed between two adjacent connecting pipes (2a). The arc block (2c) is coaxially arranged with the stator support (2), and the two ends of the arc block (2c) extend to the outer wall of the corresponding connecting pipe (2a).

5. The end cover assembly of the external rotor motor of the oil-lubricated air compressor according to claim 1, characterized in that, The inner hole of the connecting pipe (2a) is a stepped hole (2b). The stepped hole (2b) consists of a large hole (2b1) with a larger diameter and a small hole (2b2) ​​with a smaller diameter. The large hole (2b1) is behind the small hole (2b2), and the head of the bolt (4) presses against the bottom wall of the corresponding large hole (2b1).

6. The end cover assembly of the external rotor motor of the oil-lubricated air compressor according to claim 4, characterized in that, At least one arc block (2c) has multiple through holes (2d) axially penetrating it.

7. The end cover assembly of the external rotor motor of the oil-lubricated air compressor according to claim 1, characterized in that, The stator support (2) is a cast integral part.

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