Permanent magnet synchronous motor of industrial air compressor

Abstract

The utility model relates to the technical field of motors, in particular to a permanent magnet synchronous motor of an industrial air compressor, which comprises a base, a rotor core and a stator winding, a rotating shaft is fixedly connected onto the rotor core, a front end cover and a rear end cover are fixedly connected at two ends of the base respectively, and a spiral cooling water channel is arranged on the side wall of the base. A step is arranged at the rear end of the machine base, a water cooling groove is formed in the side face of the step, the sealing bottom cover is fixedly connected to the step in an attached mode and seals the water cooling groove, each cooling pipe comprises a main pipe and a branch pipe, and the branch pipes are fixed to the sealing bottom cover in a penetrating mode and communicated with the water cooling groove. The multiple cooling pipes are arranged in a front-and-back overlapping mode and mutually spread to form a certain angle in the radial direction with the rotating shaft as the center, an axial flow fan is installed at the rear end of the rotating shaft, and cooling media are poured into the cooling pipes and the water cooling groove. The motor can effectively improve the heat dissipation effect, is simple in installation and maintenance, is low in use and maintenance cost, and is safe.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a permanent magnet synchronous motor for an industrial air compressor. Background Art

[0002] The air compressor, also known as the air compressor, is the main body of the air source device. It compresses a large amount of air into a closed space through an electric motor, increasing the pressure and density of the air, so that the air can be stored and used more efficiently.

[0003] In some space-constrained installation environments, permanent magnet synchronous motors (PMSMs) often need to be installed close to air compressors and air receivers. This results in poor air flow around the PMSMs, and the compressed air from the compressors and air receivers releases significant heat, causing the surrounding temperature to rise. Therefore, it is necessary to design a PMSM with a robust heat dissipation and cooling structure suitable for industrial air compressors. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the existing technology and to propose a permanent magnet synchronous motor for an industrial air compressor.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a permanent magnet synchronous motor for an industrial air compressor, comprising a base, a rotor core and a stator winding fixed in the base, a rotating shaft fixed to the rotor core, a front cover and a rear cover fixed to the two ends of the base respectively, the rotating shaft is rotatably connected to the front cover and the rear cover through a bearing, a spiral cooling water channel is opened on the side wall of the base, and water pipe joints are connected to the two ends of the cooling water channel, the water pipe joints are used to connect a circulation device that can circulate the cooling medium in the cooling water channel, and also include a plurality of cooling pipes and annular The sealed bottom cover has an annular step at the rear end of the base, and an annular water-cooling groove is opened on the side of the step. The sealed bottom cover is fitted and fixed on the step and seals the water-cooling groove. The cooling pipe includes a triangular main pipe and three branch pipes connected to the end of the main pipe. The branch pipes are fixed on the sealed bottom cover and connected to the water-cooling groove. Several cooling pipes are overlapped front and back and radially spread out at a certain angle to each other with the rotating shaft as the center. The rear end of the rotating shaft passes through the center of several cooling pipes and an axial fan is installed on its rear end. The cooling pipes and the water-cooling groove are filled with cooling medium.

[0006] Preferably, there are two cooling pipes, and after the two cooling pipes are installed, their orthographic projections are in the shape of a hexagram.

[0007] Preferably, a first sealing ring and a second sealing ring in an annular shape are respectively embedded and fixed on the side surface and bottom surface of the sealing bottom cover that are in contact with the step.

[0008] Preferably, a liquid injection hole connected to the water cooling tank is provided on the machine base, and a plunger is threadedly connected to the liquid injection hole.

[0009] Preferably, the cooling tube is made of copper, stainless steel or aluminum alloy.

[0010] Preferably, a dust cover is fixedly connected to the rear end of the base, and the dust cover has the axial flow fan cover arranged inside.

[0011] Preferably, a plurality of heat dissipation fins are circumferentially extended on the outer wall of the base.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The permanent magnet synchronous motor of this industrial air compressor has good heat dissipation effect, is simple to install and maintain, has low use and maintenance costs, and is safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the cooling pipe installation structure.

[0016] Figure 3 yes Figure 1 A enlarged schematic diagram of the structure.

[0017] In the figure, 1. base; 11. cooling water channel; 12. water pipe joint; 13. step; 131. water cooling tank; 14. injection hole; 15. plunger; 16. dust cover; 17. heat sink fins; 2. rotor core; 3. stator winding; 4. rotating shaft; 41. bearing; 5. front cover; 6. rear cover; 7. cooling pipe; 71. main pipe; 72. branch pipe; 8. sealing bottom cover; 81. first sealing ring; 82. second sealing ring; 9. axial fan. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1 、 Figure 2As shown, an industrial air compressor permanent magnet synchronous motor includes a base 1, a rotor core 2 and a stator winding 3 fixed in the base 1, a rotating shaft 4 is fixed to the rotor core 2, and the two ends of the base 1 are respectively fixed with a front cover 5 and a rear cover 6, and the rotating shaft 4 is rotatably connected to the front cover 5 and the rear cover 6 through a bearing 41. A spiral cooling water channel 11 is opened on the side wall of the base 1, and water pipe joints 12 are connected to both ends of the cooling water channel 11. The water pipe joints 12 are used to connect a circulation device that can circulate the cooling medium in the cooling water channel 11, and also include a plurality of cooling pipes 7 and an annular sealing bottom cover 8. The rear end of the base 1 An annular step 13 is provided, and an annular water-cooling groove 131 is opened on the side of the step 13. The sealed bottom cover 8 is fitted and fixed on the step 13 and seals the water-cooling groove 131. The cooling pipe 7 includes a triangular main pipe 71 and three branch pipes 72 connected to the end of the main pipe 71. The branch pipes 72 are fixed on the sealed bottom cover 8 and communicate with the water-cooling groove 131. Several cooling pipes 7 are arranged in an overlapping manner front and back and are radially extended to each other at a certain angle with the rotating shaft 4 as the center. The rear end of the rotating shaft 4 passes through the center of several cooling pipes 7 and an axial fan 9 is installed on its rear end. The cooling pipe 7 and the water-cooling groove 131 are both filled with cooling medium.

[0020] The working principle of the present invention in actual application is as follows: when the permanent magnet synchronous motor is working, the rotation of the shaft 4 drives the rotation of the axial flow fan 9, and the axial flow fan 9 pushes the air to flow in the same direction as the shaft 4. By utilizing the principle that the cold zone medium flows from high temperature to low temperature, the cold zone medium in the cooling pipe 7 and the cooling medium in the water cooling tank 131 are accelerated to alternately form an internal circulation, thereby accelerating the heat dissipation from the rear end of the machine base 1 to the external environment. The water pipe joint 12 is connected to a circulation device that can circulate the cooling medium in the cooling water channel 11, and most of the heat in the motor is dissipated to the external environment through the machine base 1. This structure has good heat dissipation effect and is simple to install and maintain. In liquid-cooled motors, pure water or 60% biomass alcohol or 60% ethylene glycol is generally used as the cooling medium, which has good insulation, heat dissipation, stability and environmental protection. In addition, this structure isolates the cooling medium from the inside of the motor, avoiding unnecessary accidents caused by leakage of the cooling medium or motor failure and scrapping, improving safety and reducing use and maintenance costs.

[0021] like Figure 2 As shown, in this embodiment, there are two cooling pipes 7. After the two cooling pipes 7 are installed, their positive projection is in the shape of a hexagram, so that there is enough space in the middle of the two cooling pipes 7 for the rear end of the rotating shaft 4 to pass through, preventing the rear end of the motor from being mounted with too much load, so that the front and rear ends of the motor are relatively balanced and the structure is stable.

[0022] Further, if Figure 3As shown, a first annular sealing ring 81 and a second sealing ring 82 are respectively embedded and fixed on the side surface and bottom surface of the sealing bottom cover 8 where the step 13 is in contact, so as to ensure that the sealing bottom cover 8 and the step 13 are sealed at the contact point to prevent the cooling medium in the water-cooling tank 131 from leaking.

[0023] The base 1 is provided with an injection hole 14 connected to the water-cooling tank 131. The injection hole 14 is threadedly connected with a plunger 15. The plunger 15 must be removed before the cooling medium can be added to the water-cooling tank 131 through the injection hole 14. The cooling medium can also be released through the injection hole 14 during maintenance, making installation and maintenance easier.

[0024] The cooling tube 7 is made of copper, stainless steel or aluminum alloy. These metal materials are easy to obtain, have high strength and good thermal conductivity.

[0025] A dust cover 16 is fixedly connected to the rear end of the base 1. The dust cover 16 covers the axial flow fan 9 inside. The dust cover 16 is used to prevent dust accumulation between the axial flow fan 9 and the rear end cover 6, and to prevent debris from being drawn into the axial flow fan 9 to improve safety.

[0026] The outer wall of the base 1 is provided with a plurality of heat dissipation fins 17 in a circumferential direction, which are used to increase the contact area between the outer wall of the base 1 and the external environment and improve the heat dissipation efficiency.

[0027] 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. A permanent magnet synchronous motor for an industrial air compressor, comprising a base (1), a rotor core (2), and a stator winding (3) fixed in the base (1), wherein a rotating shaft (4) is fixedly connected to the rotor core (2), a front cover (5) and a rear cover (6) are fixedly connected to the two ends of the base (1), and the rotating shaft (4) is rotatably connected to the front cover (5) and the rear cover (6) through a bearing (41), a spiral cooling water channel (11) is opened on the side wall of the base (1), and water pipe joints (12) are connected to the two ends of the cooling water channel (11), and the water pipe joints (12) are used to connect a circulation device that can circulate a cooling medium in the cooling water channel (11), characterized in that: The invention also includes a plurality of cooling pipes (7) and an annular sealing bottom cover (8). The rear end of the machine base (1) is provided with an annular step (13). The side of the step (13) is provided with an annular water cooling groove (131). The sealing bottom cover (8) is fixedly connected to the step (13) and seals the water cooling groove (131). The cooling pipe (7) includes a triangular main pipe (71) and three branch pipes (72) connected to the end of the main pipe (71). The branch pipes (72) are fixed on the sealing bottom cover (8) and communicate with the water cooling groove (131). The plurality of cooling pipes (7) are overlapped and arranged front and back and radially spread out at a certain angle with the rotating shaft (4) as the center. The rear end of the rotating shaft (4) passes through the center of the plurality of cooling pipes (7) and an axial flow fan (9) is installed on the rear end. The cooling pipes (7) and the water cooling groove (131) are both filled with cooling medium.

2. The permanent magnet synchronous motor for an industrial air compressor according to claim 1, characterized in that: There are two cooling pipes (7), and after the two cooling pipes (7) are installed, their orthographic projections are in the shape of a hexagram.

3. An industrial air compressor permanent magnet synchronous motor according to any one of claims 1 or 2, characterized in that: A first sealing ring (81) and a second sealing ring (82) in an annular shape are respectively embedded and fixed on the side surface and bottom surface of the sealing bottom cover (8) that are in contact with the step (13).

4. The permanent magnet synchronous motor for an industrial air compressor according to claim 3, characterized in that: The machine base (1) is provided with a liquid injection hole (14) connected to the water cooling groove (131), and a plunger (15) is threadedly connected to the liquid injection hole (14).

5. The permanent magnet synchronous motor for an industrial air compressor according to claim 4, characterized in that: The cooling pipe (7) is made of copper, stainless steel or aluminum alloy.

6. The permanent magnet synchronous motor for an industrial air compressor according to claim 4, characterized in that: A dust cover (16) is fixedly connected to the rear end of the machine base (1), and the dust cover (16) covers the axial flow fan (9) inside.

7. The permanent magnet synchronous motor for an industrial air compressor according to claim 4, characterized in that: A plurality of heat dissipation fins (17) are circumferentially extended on the outer wall of the machine base (1).

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