Heat sink for three-phase asynchronous motor

Abstract

The utility model relates to motor heat dissipation technical field, and disclose the heat dissipation device for three-phase asynchronous motor, including motor, the motor is fixedly connected with stator in, the stator is rotatably connected with motor rotating shaft, one end of motor rotating shaft is fixedly connected with fan blade, the front end of motor rotating shaft is sleeved with the jet nozzle, the fan blade and jet nozzle are arranged respectively in the both ends of stator, the motor inner wall is opened with a plurality of the connection hole that sets up in the circumference, one end of jet nozzle is movably sleeved with the air inlet cover, the jet nozzle is fixedly sleeved on motor rotating shaft. The device can spray part of air into the motor shell to the front end of stator, effectively cools the front end of stator, to this guarantee the heat dissipation effect of stator front end, and the jet nozzle can rotate with rotor, make the jet orifice rotate along with, thereby make the airflow that the jet orifice sprays can cover the different positions of stator front end, effectively improved the uniformity of stator front end cooling.

Description

Technical Field

[0001] This utility model relates to the field of electric motor heat dissipation technology, and in particular to a heat dissipation device for a three-phase asynchronous motor. Background Technology

[0002] Three-phase asynchronous motors are a type of induction motor, powered by a simultaneous connection to a 380V three-phase AC power supply (120-degree phase difference). They are common power devices that convert three-phase AC electrical energy into mechanical energy, widely used in industry, agriculture, transportation, and daily life. Because the rotor and stator rotating magnetic fields of a three-phase asynchronous motor rotate in the same direction but at different speeds, a slip exists, hence the name "three-phase asynchronous motor." Slip is an important parameter in the operation of a three-phase asynchronous motor, reflecting its load conditions and operating efficiency. After prolonged operation, the internal temperature of a three-phase asynchronous motor will rise; therefore, heat dissipation is necessary to ensure continuous operation.

[0003] There are generally three ways to cool electric motors: air cooling, liquid cooling, and oil cooling. Among them, air cooling is the lowest cost and the most widely used. Air is introduced into the motor from the tail end, and the heat inside the motor is dissipated by the flow of air.

[0004] Regarding the above and existing related technologies, the inventor believes that the following defects often exist: the heat dissipation of the motor is generally achieved by exhausting air from the rear end of the casing, and the air flows axially inside the casing. However, the airflow can only flow over the side walls and rear end of the stator, and the front end of the stator is exposed to less airflow, which results in the heat dissipation effect of the front end of the stator being inferior to that of other parts. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing technology has the disadvantage of insufficient airflow at the front end of the stator, resulting in poor heat dissipation at the front end of the stator. To address this, we propose a heat dissipation device for three-phase asynchronous motors.

[0006] To achieve the above objectives, this application adopts the following technical solution: a heat dissipation device for a three-phase asynchronous motor, comprising a motor housing, a stator fixedly connected inside the motor housing, a rotor rotatably connected inside the stator, a fan blade fixedly connected to one end of the rotor, an air nozzle sleeved at the front end of the rotor, the fan blade and the air nozzle respectively disposed at both ends of the stator, a plurality of circumferentially arranged air holes opened at the end of the air nozzle near the stator, a plurality of circumferentially arranged connecting holes opened on the inner wall of the motor housing, an air intake cover movably sleeved at one end of the air nozzle, both ends of the connecting holes communicating with the inner cavity of the motor housing, a plurality of circumferentially arranged connecting pipes fixedly connected to one end of the inner wall of the motor housing, one end of the connecting pipes fixedly connected to the side wall of the air intake cover and the inner cavities communicating with each other, and the air nozzle fixedly sleeved on the rotor.

[0007] Preferably, a first mounting hole is provided in the middle of the jet nozzle, the rotor is fixedly sleeved in the first mounting hole, and an insertion groove is provided between the outer wall of the jet nozzle and the first mounting hole, and the jet hole is connected to the insertion groove.

[0008] Preferably, the air intake shroud has a second mounting hole in the middle, the rotor is movably sleeved in the second mounting hole, the end of the air intake shroud near the stator is inserted into the insertion groove, an air intake groove is formed between the outer wall of the air intake shroud and the second mounting hole, and the inner cavity of the connecting pipe is connected to the air intake groove.

[0009] Preferably, a front cover and a rear cover are fixedly sleeved at both ends of the motor housing, one end of the rotor is connected to the middle of the front cover and extends to the outside, the fan blade is disposed inside the rear cover, and several air holes are provided on both the front cover and the rear cover.

[0010] Preferably, the connecting hole is composed of a first guide hole, a second guide hole, and a third guide hole. The second guide hole and the third guide hole are respectively located at both ends of the first guide hole and are connected to each other. The second guide hole is connected to the inner cavity of the motor housing.

[0011] Preferably, the second guide hole is disposed between the stator and the fan blade, and the third guide hole is connected to the inner cavity of the connecting pipe.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] In this invention, some of the air entering the motor housing can be sprayed onto the front end of the stator to effectively cool the front end of the stator, thereby ensuring the heat dissipation effect of the front end of the stator.

[0014] In this invention, the jet nozzle can rotate with the rotor, causing the jet hole to rotate as well. This allows the airflow ejected from the jet hole to cover different positions at the front end of the stator, effectively improving the uniformity of cooling at the front end of the stator. Attached Figure Description

[0015] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the motor housing in this utility model;

[0018] Figure 3 This is a schematic diagram of the stator and rotor in this utility model;

[0019] Figure 4 This is a schematic diagram of the air nozzle structure in this utility model;

[0020] Figure 5 This is a schematic diagram of the air intake cover in this utility model.

[0021] Legend: 1. Motor housing; 2. Stator; 3. Rotor; 4. Fan blade; 5. Air nozzle; 51. First mounting hole; 52. Insertion slot; 6. Air nozzle; 7. Connecting hole; 71. First guide hole; 72. Second guide hole; 73. Third guide hole; 8. Air intake cover; 81. Second mounting hole; 82. Air intake slot; 9. Connecting pipe; 10. Front end cover; 11. Rear end cover. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0023] Reference Figure 1-5As shown, this utility model provides a technical solution: a heat dissipation device for a three-phase asynchronous motor, including a motor housing 1, a stator 2 fixedly connected inside the motor housing 1, a rotor 3 rotatably connected inside the stator 2, a fan blade 4 fixedly connected to one end of the rotor 3, and a nozzle 5 sleeved on the front end of the rotor 3. The fan blade 4 and the nozzle 5 are respectively disposed at both ends of the stator 2. The nozzle 5 has several circumferentially arranged air holes 6 at the end near the stator 2. Several circumferentially arranged connecting holes 7 are provided on the inner wall of the motor housing 1. An air intake cover 8 is movably sleeved on one end of the nozzle 5. Both ends of the connecting holes 7 are connected to the inner cavity of the motor housing 1. Several circumferentially arranged connecting pipes 9 are fixedly connected to one end of the inner wall of the motor housing 1. One end of the connecting pipes 9 is fixedly connected to the side wall of the air intake cover 8 and their inner cavities are interconnected. The nozzle 5 is fixedly sleeved on the rotor 3.

[0024] A first mounting hole 51 is provided in the middle of the nozzle 5. The rotor 3 is fixedly sleeved in the first mounting hole 51. An insertion groove 52 is provided between the outer wall of the nozzle 5 and the first mounting hole 51. The nozzle 6 communicates with the insertion groove 52. A sealing ring is provided on the inner side of the insertion groove 52 to increase the sealing between the outer wall of the air intake shroud 8 and the insertion groove 52. The first mounting hole 51 allows the nozzle 5 to be sleeved on the rotor 3. At the same time, the rotor 3 can drive the nozzle 5 to rotate. The air intake shroud 8 can be inserted into the insertion groove 52, so that the air discharged from the air intake shroud 8 enters the insertion groove 52.

[0025] A second mounting hole 81 is provided in the middle of the air intake shroud 8. The rotor 3 is movably fitted into the second mounting hole 81. The end of the air intake shroud 8 near the stator 2 is inserted into the insertion groove 52. An air intake groove 82 is provided between the outer wall of the air intake shroud 8 and the second mounting hole 81. The inner cavity of the connecting pipe 9 is connected to the air intake groove 82. The second mounting hole 81 allows the rotor 3 to be fitted into the air intake shroud 8. At the same time, when the rotor 3 rotates, it will not drive the air intake shroud 8 to rotate. The air discharged into the air intake shroud 8 enters the air intake groove 82 and flows into the insertion groove 52.

[0026] A front cover 10 and a rear cover 11 are fixedly fitted to both ends of the motor housing 1, respectively. One end of the rotor 3 is connected to the middle of the front cover 10 and extends to the outside. The fan blade 4 is located inside the rear cover 11. Several air holes are provided on both the front cover 10 and the rear cover 11. The front cover 10 and the rear cover 11 block the openings at both ends of the motor housing 1. The front cover 10 and the rear cover 11 are fixed to the motor housing 1 by bolts for easy disassembly. The air holes on the front cover 10 and the rear cover 11 serve the functions of air intake and exhaust.

[0027] The connecting hole 7 is composed of a first guide hole 71, a second guide hole 72, and a third guide hole 73. The second guide hole 72 and the third guide hole 73 are respectively located at both ends of the first guide hole 71 and are connected. The second guide hole 72 is connected to the inner cavity of the motor housing 1. Air first enters through the second guide hole 72, then flows axially within the first guide hole 71, and finally exits through the third guide hole 73.

[0028] The second guide hole 72 is located between the stator 2 and the fan blade 4, and the third guide hole 73 is connected to the inner cavity of the connecting pipe 9. The air entering the second guide hole 72 has not yet come into contact with the stator 2 and has not absorbed the temperature of the stator 2, so the temperature is low. This low-temperature air will be sprayed to the front end of the stator 2, making the cooling effect of the front end of the stator 2 better.

[0029] Working Principle: When rotor 3 starts rotating, it synchronously drives fan blade 4 to rotate as well. When fan blade 4 rotates, it creates a negative pressure at the tail of motor housing 1, drawing in outside air. This drawn-in air flows axially inside motor housing 1, dissipating heat from the rear end and side walls of stator 2 during this flow. Simultaneously, some of the air drawn into the inner cavity of motor housing 1 flows into connecting hole 7. The air first enters the second guide hole 72, then moves axially within the first guide hole 71, and finally exits through the third guide hole 73 into connecting pipe 9. After entering the air intake shroud 8 through connecting pipe 9, the air flows from the air intake slot 82 inside the air intake shroud 8 into the insertion slot 52 on the nozzle 5, and finally exits through the nozzle 6. The ejected air blows directly towards the front end of stator 2, effectively cooling the front end of stator 2 and ensuring its heat dissipation. Furthermore, when rotor 3 rotates, it also drives nozzle 5 to rotate, causing nozzle 6 to rotate as well. In this way, the airflow ejected from the jet hole 6 can cover different positions at the front end of the stator 2, effectively improving the uniformity of cooling at the front end of the stator 2.

[0030] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A heat sink for a three-phase asynchronous motor, characterized in that, The device includes an electric motor housing, a stator fixedly connected inside the housing, a rotor rotatably connected inside the stator, a fan blade fixedly connected to one end of the rotor, and an air nozzle sleeved at the front end of the rotor. The fan blade and the air nozzle are respectively located at both ends of the stator. The end of the air nozzle near the stator has several circumferentially arranged air holes. The inner wall of the electric motor housing has several circumferentially arranged connecting holes. One end of the air nozzle is movably sleeved with an air intake cover. Both ends of the connecting holes are connected to the inner cavity of the electric motor housing. One end of the inner wall of the electric motor housing is fixedly connected to several circumferentially arranged connecting pipes. One end of the connecting pipes is fixedly connected to the side wall of the air intake cover and their inner cavities are interconnected. The air nozzle is fixedly sleeved on the rotor.

2. The heat dissipation device for a three-phase asynchronous motor according to claim 1, characterized in that: The nozzle has a first mounting hole in the middle, the rotor is fixedly sleeved in the first mounting hole, and a insertion groove is provided between the outer wall of the nozzle and the first mounting hole. The air jet hole is connected to the insertion groove.

3. The heat dissipation device for a three-phase asynchronous motor according to claim 1, characterized in that: The air intake shroud has a second mounting hole in the middle, the rotor is movably sleeved in the second mounting hole, the end of the air intake shroud near the stator is inserted into the insertion groove, an air intake groove is formed between the outer wall of the air intake shroud and the second mounting hole, and the inner cavity of the connecting pipe is connected to the air intake groove.

4. The heat dissipation device for a three-phase asynchronous motor according to claim 1, characterized in that: The motor housing is fixedly fitted with a front cover and a rear cover at both ends. One end of the rotor is connected to the middle of the front cover and extends to the outside. The fan blade is set inside the rear cover. Both the front cover and the rear cover have several air holes.

5. The heat dissipation device for a three-phase asynchronous motor according to claim 1, characterized in that: The connecting hole is composed of a first guide hole, a second guide hole, and a third guide hole. The second guide hole and the third guide hole are respectively located at both ends of the first guide hole and are connected to each other. The second guide hole is connected to the inner cavity of the motor housing.

6. The heat dissipation device for a three-phase asynchronous motor according to claim 5, characterized in that: The second guide hole is located between the stator and the fan blade, and the third guide hole is connected to the inner cavity of the connecting pipe.

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