A motor housing for a screw air compressor and its assembly tool

Abstract

The utility model provides a motor housing for a screw air compressor and its assembly tooling, including a barrel and a front end cover, the barrel and the front end cover are integrally formed, a plurality of heat dissipation holes 1 are circumferentially provided on the barrel near the front end cover, and a plurality of heat dissipation holes 2 are evenly distributed circumferentially on the front end cover; the barrel and the front end cover are concentrically arranged, and the outer diameter of the barrel is smaller than the outer diameter of the front end cover, thereby forming a step between the front end cover and the barrel, and a plurality of ribs are evenly distributed circumferentially on the step. The motor housing of the utility model is an integrally formed structure, thereby achieving better processing requirements, and the overall processing technology becomes simpler, without the need for multiple processes, thereby greatly reducing the probability of low motor performance caused by manufacturing errors; the assembly tooling overturns the existing assembly process, so that the rotor can be smoothly placed in the motor housing, avoiding the problem of improper installation due to adsorption between the rotor and the stator.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a motor housing for a screw air compressor and an assembly tool thereof. Background Art

[0002] Screw air compressors are usually driven by motors, and the motors include motor housings, stators and rotors. The motor housings include barrels, front cover and rear cover. The front cover is installed at the front end of the barrel by screws. Figure 1 As shown, the existing connection method between the front end cover 101 and the cylinder body 102 has the following defects: 1. There may be a problem of low concentricity between the front end cover and the cylinder body; 2. The end cover requires at least three processes during processing, namely: the inner end face 103, the step face 104 and the chamfered face 105 on the outer edge of the inner end face 103, and the cylinder body 102 requires three processes, namely: the outer plane 106 matching the step face 104, the inner plane 107 matching the inner end face 103, and the inner wall 108 formed between the outer plane 106 and the inner plane 107. After processing, the tolerances of the various processed surfaces are added together, which may result in a large error, which leads to the front end cover 10 1 and the cylinder 102 become difficult to assemble accurately. In addition, it costs a lot to complete these high-precision processes. 3. Be extra careful when stacking and transporting the front end cover and the cylinder, because once the high-precision machined surface is bumped, the overall performance of the motor will be reduced after the later assembly. Therefore, this undoubtedly increases the additional transportation, packaging and other costs. 4. Since the rotor will absorb the stator, during assembly, we first insert the rotor shaft of the rotor into the center of the front end cover, and then insert the cylinder with the stator into the rotor, so that the cylinder and the front end cover are fixedly connected together to complete the assembly. However, since the front end cover and the cylinder are split, this assembly method is more complicated. Summary of the invention

[0003] The utility model aims to solve the existing technical problem and provide a motor housing for a screw air compressor and an assembly tool thereof, which greatly reduces the processing steps of the front end cover and the barrel, greatly reduces the requirements for processing accuracy, is also conducive to processing, and then meets the concentricity requirements of the front end cover and the barrel; and, through the assembly tool, the assembly of the rotor and the motor housing becomes simple and high in accuracy.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] The utility model discloses a motor housing for a screw air compressor, comprising a cylinder and a front end cover, wherein the cylinder and the front end cover are integrally formed, a plurality of heat dissipation holes one are circumferentially arranged at a position close to the front end cover on the cylinder, and a plurality of heat dissipation holes two are circumferentially evenly distributed on the front end cover; the cylinder and the front end cover are concentrically arranged, and the outer diameter of the cylinder is smaller than the outer diameter of the front end cover, thereby forming a step between the front end cover and the cylinder, and a plurality of ribs are circumferentially evenly distributed on the step.

[0006] The integrally formed barrel and front end cover can ensure good concentricity, thereby avoiding the problem of inadequate installation and low concentricity of the split type. The motor housing for the screw air compressor of the utility model forms a multi-directional eddy current heat dissipation effect on the inside of the barrel through a plurality of heat dissipation holes 1 and 2, and has good heat dissipation performance. The step with ribs makes the connection strength between the front end cover and the barrel higher.

[0007] The plurality of heat dissipation holes 1 are provided in four groups, which are evenly distributed in a circle, and the heat dissipation holes 1 in a group are designed to be directly opposite to each other in a straight line.

[0008] The heat dissipation holes are designed to be directly opposite to each other in a straight line, so that strong air convection can be formed inside the cylinder, thereby improving the heat dissipation effect.

[0009] The front end cover is provided with a heat dissipation groove at a position corresponding to the heat dissipation hole 2.

[0010] Since the front cover is connected to the shell of the screw compressor and the heat dissipation groove is facing the end face of the shell, the contact area with the shell can be reduced, thereby reducing the speed at which the heat of the shell is transferred to the front cover. At the same time, the hot air is in the heat dissipation groove, which can slow down the temperature increase rate of the front cover. In fact, it also increases the heat dissipation area of ​​the front cover.

[0011] The utility model also discloses an assembly tool for a motor housing for a screw air compressor, and its technical solution is:

[0012] It includes a fixing rod and a guide body sleeved on the fixing rod, the fixing rod is screwed into the central screw hole on the end face of the rotor shaft, the outer diameter of the guide body matches the inner diameter of the central hole of the front end cover; the fixing rod, the guide body, the cylinder body and the front end cover are concentrically designed; the lower end face of the guide body is horizontally fitted with the end face of the shaft.

[0013] During installation, first fix the rotor in the clamp and screw the fixing rod to the end face of the rotor's rotating shaft. Then, put on the guide body and make the lower end face of the guide body horizontally fit the end face of the rotating shaft. Finally, put the fixing rod on the motor housing with the stator installed, and make the center hole of the front end cover fit into the guide body. Due to the guiding and limiting effect of the guide body, the motor housing will not deviate even if it is adsorbed with the rotor until the motor housing is installed in place, that is, the center hole of the front end cover fits into the rotating shaft.

[0014] The gap between the central hole of the guide body and the fixing rod is 0.3-0.5 mm.

[0015] The smaller gap makes the concentricity between the guide body and the fixing rod higher, and makes the assembly accuracy and concentricity of the motor housing and the rotor higher.

[0016] In summary, the beneficial effects of the utility model are:

[0017] Compared with the prior art, the motor housing and assembly tooling for a screw air compressor of the utility model structure, wherein the motor housing is an integrally formed structure, thereby achieving better processing requirements, and the overall processing technology becomes simpler, without the need for multiple processes, thereby greatly reducing the probability of low motor performance caused by manufacturing errors; the assembly tooling overturns the existing assembly process, so that the rotor can be smoothly placed in the motor housing, avoiding the problem of improper installation due to adsorption between the rotor and the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the background technology;

[0019] Figure 2 It is a three-dimensional diagram of a motor housing for a screw air compressor of the utility model at one angle;

[0020] Figure 3 It is a three-dimensional diagram of the motor housing for the screw air compressor of the utility model from another angle;

[0021] Figure 4 It is a schematic diagram of a straight line directly opposite to the heat dissipation hole 1 of the motor housing of the screw air compressor of the utility model;

[0022] Figure 5 This is a structural sectional view of a motor housing for a screw air compressor of the utility model;

[0023] Figure 6 The utility model is a structural schematic diagram of a motor housing for a screw air compressor and an assembly tool thereof. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] See also Figures 1 to 6The utility model provides a motor housing for a screw air compressor, comprising a barrel 1 and a front end cover 2, the barrel 1 and the front end cover 2 are integrally formed, a plurality of heat dissipation holes 3 are circumferentially provided on the barrel 1 near the front end cover 2, and a plurality of heat dissipation holes 4 are evenly distributed on the front end cover 2; the barrel 1 and the front end cover 2 are concentrically arranged, and the outer diameter of the barrel 1 is smaller than the outer diameter of the front end cover 2, thereby forming a step 5 between the front end cover 2 and the barrel 1, and a plurality of ribs 6 are evenly distributed on the step 5.

[0026] The integrally formed barrel 1 and front end cover 2 can ensure good concentricity, thereby avoiding the problem of inadequate installation and low concentricity of the split type. The motor housing of the screw air compressor of the utility model forms a multi-directional eddy current heat dissipation effect on the inside of the barrel 1 through a plurality of heat dissipation holes 1 3 and heat dissipation holes 2 4, and has good heat dissipation performance. The step 5 with ribs 6 makes the connection strength between the front end cover 2 and the barrel 1 higher.

[0027] The plurality of heat dissipation holes 3 are provided in four groups, which are evenly distributed around the circumference, and the heat dissipation holes 3 in a group are designed to be straight and opposite to each other in pairs.

[0028] The heat dissipation holes 3 designed to be directly opposite to each other in a straight line enable strong air convection to be formed inside the cylinder 1, thereby improving the heat dissipation effect.

[0029] The front end cover 2 has a heat dissipation groove 7 at a position corresponding to the heat dissipation hole 2 4 .

[0030] Since the front cover 2 is connected to the shell of the screw compressor and the heat dissipation groove 7 is facing the end face of the shell, the contact area with the shell can be reduced, thereby reducing the speed at which the heat of the shell is transferred to the front cover 2. At the same time, the hot air is in the heat dissipation groove 7, which can slow down the temperature increase rate of the front cover 2. In fact, it also increases the heat dissipation area of ​​the front cover 2.

[0031] The motor housing of the screw air compressor of the utility model smoothly places the rotor into the motor housing through an assembly tool. Specifically, the assembly tool includes a fixing rod 8 and a guide body 9 sleeved on the fixing rod 8. The fixing rod 8 is screwed into the central screw hole 12 of the end face of the rotating shaft 11 of the rotor 10. The outer diameter of the guide body 9 matches the inner diameter of the central hole 13 of the front end cover 2. The fixing rod 8, the guide body 9, the cylinder 1 and the front end cover 2 are concentrically designed. The lower end face of the guide body 9 is horizontally fitted with the end face of the rotating shaft 11.

[0032] The gap between the central hole of the guide body 9 and the fixing rod 8 is 0.3-0.5 mm.

[0033] The smaller gap makes the concentricity between the guide body 9 and the fixing rod 8 higher, and makes the assembly accuracy and concentricity of the motor housing 14 and the rotor 10 higher.

[0034] The following is an explanation of the use process of the assembly tool for the motor housing of the screw air compressor of the utility model:

[0035] First, fix the rotor 10 in the fixture and screw the fixing rod 8 to the end face of the rotating shaft 11 of the rotor 10. Then, put on the guide body 9 and make the guide body 9 slide along the fixing rod 8 toward the rotor 10. Finally, the lower end face of the guide body 9 is horizontally fitted to the end face of the rotating shaft 11. Finally, put the fixing rod 8 on the motor housing 14 equipped with the stator, and make the center hole 13 of the front end cover 2 fit into the guide body 9. Under the guiding and limiting effect of the guide body 9, the motor housing 14 will not be offset even if it is adsorbed with the rotor 10 until the motor housing 14 is installed in place, that is, the center hole 13 of the front end cover 2 fits into the rotating shaft.

[0036] In summary, the motor housing and assembly tooling for the screw air compressor of the utility model, the motor housing 14 is an integrally formed structure, thereby achieving better processing requirements, and the overall processing technology becomes simpler, without the need for multiple processes, thereby greatly reducing the probability of low motor performance caused by manufacturing errors; the assembly tooling subverts the existing assembly process, so that the rotor 10 can be smoothly placed in the motor housing 14, avoiding the problem of improper installation due to adsorption between the rotor 10 and the stator.

[0037] The motor housing and assembly tooling for the screw air compressor provided by the embodiment of the utility model are introduced in detail above. The principle and implementation mode of the utility model are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the technical solution disclosed by the utility model; at the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation of the utility model.

Claims

1. A motor housing for a screw air compressor, comprising a barrel and a front end cover, characterized in that: The cylinder body and the front end cover are integrally formed, a plurality of heat dissipation holes 1 are circumferentially provided on the cylinder body near the front end cover, and a plurality of heat dissipation holes 2 are evenly distributed circumferentially on the front end cover; the cylinder body and the front end cover are concentrically arranged, and the outer diameter of the cylinder body is smaller than the outer diameter of the front end cover, thereby forming a step between the front end cover and the cylinder body, and a plurality of ribs are evenly distributed circumferentially on the step.

2. The motor housing for a screw air compressor according to claim 1, characterized in that: The plurality of heat dissipation holes 1 are provided in four groups, which are evenly distributed in a circle, and the heat dissipation holes 1 in a group are designed to be directly opposite to each other in a straight line.

3. The motor housing for a screw air compressor according to claim 1, characterized in that: A heat dissipation groove is provided on the front end cover at a position corresponding to the second heat dissipation hole.

4. An assembly tool for a motor housing for a screw air compressor according to claim 1, characterized in that: It includes a fixing rod and a guide body sleeved on the fixing rod, the fixing rod is screwed into the central screw hole on the end face of the rotor shaft, the outer diameter of the guide body matches the inner diameter of the central hole of the front end cover; the fixing rod, the guide body, the cylinder body and the front end cover are concentrically designed; the lower end face of the guide body is horizontally fitted with the end face of the shaft.

5. The assembly tool for the motor housing for a screw air compressor according to claim 4, characterized in that: The gap between the central hole of the guide body and the fixing rod is 0.3-0.5 mm.

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