Rear heat dissipation structure of adjustable-speed motor

Abstract

A rear heat dissipation structure of an adjustable-speed motor comprises a motor shell, a stator, a rotor, a rotating shaft and a plurality of heat conduction pipes. The heat conduction pipes are fixedly embedded in the stator, the two ends of each heat conduction pipe extend to the outer end face of the motor shell respectively, the rear end of the rotating shaft is connected with the cooling fan, a fan cover is arranged on the outer side of the cooling fan and installed on cooling fins on the peripheral wall of the motor shell, an inner layer cover is arranged in the fan cover, and the inner layer cover covers rear ports of the heat conduction pipes. An air outlet channel is formed in the outer wall of the inner-layer cover and extends to the outer side of the fan cover, and an impeller is arranged in the inner-layer cover and installed on the rotating shaft. According to the utility model, the impeller and the cooling fan are respectively arranged at the rear part of the motor, and the impeller and the cooling fan independently work in different spaces to respectively cool different positions of the motor without influencing each other, so that the cooling efficiency of the motor can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to a rear heat dissipation structure for a speed-regulating motor. Background Technology

[0002] Speed-regulating motors are motors that change their rotational speed by altering the number of pole pairs, voltage, current, frequency, etc., to achieve higher performance. Existing technology, application number 202120651020.0, discloses a high-efficiency heat-dissipating switched reluctance motor (a type of speed-regulating motor). This patent features an axial through-hole in the stator with a heat pipe installed within it. During operation, heat is dissipated through the heat pipe, and circulating air passes through it, thus reducing the motor temperature. However, as shown in the accompanying drawings, the fan shroud at the rear of the motor is mounted on heat sinks surrounding the motor. This causes airflow from the outside of the motor to enter the fan shroud through the gap between adjacent heat sinks (see below). Figure 1 While it can achieve the same effect of cooling the motor as a whole, this structure will reduce the airflow into the heat pipe, thus reducing the heat dissipation effect of the heat pipe. Utility Model Content

[0003] Based on the above problems, the purpose of this utility model is to provide a rear heat dissipation structure for a speed-regulating motor. The utility model adopts the following technical solution:

[0004] This utility model provides a rear heat dissipation structure for a speed-regulating motor, including a motor housing, a stator, a rotor, a shaft, and multiple heat pipes. The stator has multiple axial through holes along its axis. The multiple heat pipes are fixedly embedded in the multiple axial through holes one-to-one, and both ends of the heat pipes extend to the outer end face of the motor housing. The shaft passes through the rear end wall of the motor housing and is connected to a cooling fan. A fan cover is provided on the outside of the cooling fan and is installed on the heat sink fins on the outer peripheral wall of the motor housing. An inner cover is provided inside the fan cover and is installed on the rear end wall of the motor housing. The inner cover covers the rear ends of each heat pipe. A reserved hole is provided on the inner cover for the shaft to pass through. The shaft is rotatably and sealingly connected to the reserved hole. An air outlet channel is provided on the outer wall of the inner cover and extends to the outside of the fan cover. An impeller is provided inside the inner cover and is installed on the shaft.

[0005] Preferably, the heat pipe is made of copper, and fins are provided on the inner wall of the heat pipe.

[0006] Preferably, the outer edge of the inner cover near the cooling fan is set as a slope.

[0007] Preferably, the fan cover includes a front section and a rear section, which are detachably connected. The rear section has a heat dissipation hole at its end. The front section is mounted on a heat sink on the outer peripheral wall of the motor housing. The air outlet passage passes through the front section and is fixedly connected to it.

[0008] Preferably, the front and rear sections of the cover are connected and fixed by screws.

[0009] Preferably, an elbow is provided at the outer end of the air outlet channel.

[0010] Preferably, a protective net is provided on the port of the elbow.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] This invention arranges an impeller and a cooling fan at the rear of the motor. The two work independently in different spaces and dissipate heat from different parts of the motor without affecting each other, which can effectively improve the heat dissipation efficiency of the motor. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram illustrating the airflow direction at the connection point between the heat sink and the fan shroud in the background art.

[0015] Figure 2 This is a cross-sectional view of the rear heat dissipation structure of the speed-regulating motor of this utility model;

[0016] Figure 3 This is a schematic diagram of the rear heat dissipation structure of the speed-regulating motor of this utility model;

[0017] Figure 4 This is a schematic diagram of the internal structure of the heat pipe of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Motor housing; 2. Stator; 3. Rotor; 4. Shaft; 5. Heat pipe; 501. Fin; 6. Cooling fan; 7. Fan cover; 701. Front section of the cover; 702. Rear section of the cover; 703. Heat dissipation hole; 8. Inner cover; 801. Reserved hole; 9. Air outlet channel; 901. Elbow; 902. Protective net; 10. Impeller; Detailed Implementation

[0019] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 2As shown, this embodiment discloses a rear heat dissipation structure for a speed-regulating motor. The speed-regulating motor in this embodiment is a switched reluctance motor, which includes a motor housing 1, a stator 2, a rotor 3, a rotating shaft 4, and multiple heat pipes 5. The stator 2 is fixedly connected to the inner wall of the motor housing 1, and a winding is wound on the stator 2. The rotor 3 is located in the stator 2 and is fixedly connected to the rotating shaft 4 and covers the rotating shaft 4. The rotating shaft 4 is rotatably connected to the motor housing 1, and the central axis of the stator 2, the central axis of the rotating shaft 4, and the central axis of the motor housing 1 coincide.

[0021] The stator 2 has multiple axial through holes along its axis; multiple heat pipes 5 are fixedly embedded in the multiple axial through holes one by one, and the two ends of the heat pipes 5 extend to the outer end face of the motor housing 1 respectively. The rotating shaft 4 passes through the rear end wall of the motor housing 1 and is connected to the cooling fan 6. A fan cover 7 is provided on the outside of the cooling fan 6. The fan cover 7 is installed on the heat sink 101 on the outer peripheral wall of the motor housing 1 by screws.

[0022] An inner cover 8 is provided in the fan cover 7. The inner cover 8 is installed on the rear end wall of the motor housing 1. The inner cover 8 covers the rear port of each heat pipe 5. A reserved hole 801 is provided on the inner cover 8 for the shaft 4 to pass through. The shaft 4 is rotatably and sealedly connected to the reserved hole 801. Sealing filler can be arranged at the contact position between the reserved hole 801 and the shaft 4. An air outlet channel 9 is provided on the outer wall of the inner cover 8. The air outlet channel 9 extends to the outside of the fan cover 7. An impeller 10 is provided in the inner cover 8. The impeller 10 is installed on the shaft 4.

[0023] The working principle of this invention is as follows: The heat generated by the motor is released through the heat sink 101. The airflow outside the motor carries the heat from the heat sink 101 and enters the area between the fan cover 7 and the inner cover 8 through the gap between two adjacent heat sinks 101. Finally, it is exhausted to the rear of the motor by the cooling fan 6. At the same time, the heat generated by the motor is transferred to the heat pipe 5. The air that can flow through the heat pipe 5 carries the heat to the inner cover 8, and finally, the hot air is exhausted through the exhaust channel 9 by the impeller 10. The impeller 10 and the cooling fan 6 work independently in different spaces and do not affect each other.

[0024] In order to facilitate airflow through the area between the fan cover 7 and the inner cover 8 to the cooling fan 6, in this embodiment, the outer edge of the inner cover 8 near the cooling fan 6 is set as a slope.

[0025] like Figure 3 As shown, the fan cover 7 includes a front section 701 and a rear section 702. The front section 701 and the rear section 702 are detachably connected. The rear section 702 has a heat dissipation hole 703 at its end. The front section 701 is mounted on the heat sink 101 on the outer peripheral wall of the motor housing 1. The air outlet channel 9 passes through the front section 701 and is fixedly connected to the front section 701.

[0026] During installation, the front section 701 of the cover is first installed on the heat sink 101 on the outer peripheral wall of the motor housing 1 with screws. Then, the inner cover 8 is installed on the rear end wall of the motor housing 1 through the opening at the rear of the front section 701. The inner cover 8 is fixed to the rear end wall of the motor housing 1 with screws. Finally, the rear section 702 of the cover is installed at the rear of the front section 701.

[0027] In this embodiment, the front section 701 and the rear section 702 of the cover are connected and fixed by screws.

[0028] In this embodiment, the outer opening of the air outlet channel 9 faces upward, and an elbow 901 is provided at the outer end of the air outlet channel 9. The elbow 901 bends towards the rear of the motor, and a protective net 902 is provided at the port of the elbow 901 to prevent foreign objects from entering the inner cover 8.

[0029] The heat pipe 5 is made of a metal with excellent thermal conductivity, which accelerates heat transfer and dissipation, ensuring the motor's operating temperature remains within the normal range. In this embodiment, the heat pipe 5 is made of copper. As is well known, copper is a metal with excellent thermal conductivity. Figure 4 As shown, to further improve the heat dissipation performance of the heat pipe 5, fins 501 are provided on the inner wall of the heat pipe 5. In this way, when the airflow flows through the inner cavity of the heat pipe 5, the contact surface with the airflow can be increased or decreased through the fins 501, thereby carrying away more heat through the airflow. The fins 501 extend axially along the inner wall of the heat pipe 5.

[0030] To prevent water and other foreign objects from entering the stator 2 and damaging the motor when used in humid environments, sealing rings can be added to both ends of the heat pipe 5. This improves the overall sealing performance at the connection between the heat pipe 5 and the motor housing 1, thereby expanding the motor's applicable environment. Additionally, to prevent foreign objects from entering the heat pipe 5, a filter screen can be placed at the front end of the heat pipe 5.

[0031] It should be noted that the motor housing 1 is mainly composed of the housing body and end caps arranged at both ends of the housing body. The motor housing 1, stator 2 and rotor 3 are all conventional technologies in the field of motors, and their detailed structure and connection relationship will not be described.

[0032] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A speed-regulating motor rear heat dissipation structure, comprising a motor shell (1), a stator (2), a rotor (3), a rotating shaft (4) and a plurality of heat-conducting pipes (5); the stator (2) is provided with a plurality of axial through holes along an axis; a plurality of the heat-conducting pipes (5) are fixedly embedded in the axial through holes one by one, and both ends of the heat-conducting pipes (5) extend to the outer end face of the motor shell (1) respectively, the rotating shaft (4) penetrates through the rear end wall of the motor shell (1) and is connected with a heat dissipation fan (6), the outer side of the heat dissipation fan (6) is provided with a fan cover (7), and the fan cover (7) is installed on the heat dissipation fins (101) of the peripheral wall of the motor shell (1), characterized in that: The fan cover (7) is provided with an inner cover (8), which is installed on the rear end wall of the motor housing (1), covers the rear end of each heat pipe (5), is provided with a reserved hole (801) through which the rotating shaft (4) passes, and is in rotating sealing connection with the reserved hole (801).

2. The speed-regulated motor rear heat dissipation structure according to claim 1, characterized in that: The heat pipe (5) is made of copper, and the inner wall of the heat pipe (5) is provided with fins (501).

3. The speed-regulated motor rear heat dissipation structure according to claim 1, characterized in that: The inner cover (8) is provided with a slope at the outer edge of one end close to the cooling fan (6).

4. The speed-regulated motor rear heat dissipation structure according to claim 1, characterized in that: The fan cover (7) comprises a cover front section (701) and a cover rear section (702), the cover front section (701) and the cover rear section (702) are detachably connected, the cover rear section (702) is provided with a heat dissipation hole (703) at the end, the cover front section (701) is installed on the heat dissipation fin (101) of the outer peripheral wall of the motor housing (1), and the air outlet channel (9) penetrates through the cover front section (701) and is fixedly connected with the cover front section (701).

5. The speed-regulated motor rear heat dissipation structure according to claim 4, characterized in that: The cover front section (701) and the cover rear section (702) are fixedly connected through screws.

6. The speed-regulated motor rear heat dissipation structure according to claim 1, characterized in that: The outer end of the air outlet channel (9) is provided with an elbow (901).

7. The speed-regulated motor rear heat dissipation structure according to claim 6, characterized in that: The port of the elbow (901) is provided with a protective net (902).

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