Motor cooling structure

Abstract

The present invention provides a motor heat dissipation structure. It solves the existing technical problems. The motor heat dissipation structure comprises a base with a rear end cover, a motor body is arranged in the base, a control box is connected to the end of the rear end cover away from the base, the rear end cover is hollow and a partition body is arranged inside, the side of the partition body facing the base forms a motor cooling zone located at the front end of the rear end cover, the side of the partition body facing the control box forms a control box cooling zone located at the rear end of the rear end cover, a heat dissipation fan connected to the rotor shaft of the motor body is arranged in the motor cooling zone, the motor cooling zone and the control box cooling zone are connected and a flow guide mechanism is arranged between the two. The present invention has the advantages of good heat dissipation effect.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a motor heat dissipation structure. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy. It is mainly composed of a stator, a rotor, a casing, an end cover, and other parts. During the use of the motor, the motor will generate a large amount of heat. When the heat reaches a certain level, the motor cannot be used, otherwise insulation breakdown will occur and the motor will burn out. The existing heat dissipation is achieved through the heat dissipation capacity of the motor itself, but the heat dissipation effect is not good. At present, heat dissipation ribs are set on the motor casing, and several heat dissipation ribs are arranged around the motor casing to transfer the large amount of heat generated through the heat dissipation ribs on the casing. The heat dissipation efficiency is low and the effect is poor.

[0003] In response to this problem, people have also conducted exploration and research in long-term production and life practices. For example, a Chinese invention patent discloses a heat dissipation structure of a stepper motor [application number: 201621195613.6]. The invention patent includes a heat dissipation structure provided on the motor back cover of the stepper motor. The heat dissipation structure includes a cover shell with side walls and a bottom and a fan provided in the cover shell. The cover shell is fixed to the motor back cover through a locking unit. The fan includes an outer frame circumferentially fixed in the cover shell, a mounting frame provided at one end of the outer frame close to the motor back cover, and a circumferentially rotatable impeller vertically provided on the mounting frame. A fixing unit for axially fixing the fan is provided between the fan and the motor back cover.

[0004] The above solution improves some of the problems of the prior art to a certain extent. However, the solution still has at least the following defects: low heat dissipation efficiency and poor effect. Summary of the invention

[0005] The object of the present invention is to provide a motor heat dissipation structure with good heat dissipation effect in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: the motor heat dissipation structure comprises a base with a rear end cover, the base is provided with a motor body, the end of the rear end cover away from the base is connected to a control box, the rear end cover is hollow and has a partition body inside, the side of the partition body facing the base forms a motor cooling zone located at the front end of the rear end cover, the side of the partition body facing the control box forms a control box cooling zone located at the rear end of the rear end cover, the motor cooling zone is provided with a heat dissipation fan connected to the rotor shaft of the motor body, the motor cooling zone and the control box cooling zone are connected and a flow guide mechanism is provided between the two. The partition body divides the cavity in the middle of the rear end cover into a control box cooling zone and a motor cooling zone, the heat dissipation fan blows the air entering from the control box cooling zone to the motor cooling zone, the air flows smoothly, the hot air will not reflux and accumulate in the rear end cover, the heat dissipation is higher, and the heat dissipation fan is arranged in the motor cooling zone, the flow field flow loss is small.

[0007] In the above-mentioned motor heat dissipation structure, the air guide mechanism includes an air inlet structure connecting the outer wall of the control box with the control box cooling zone and an air outlet structure connecting the motor cooling zone with the outer wall of the base, and the partition body is provided with an air duct connecting the control box cooling zone and the motor cooling zone. The air inlet structure connects the outer wall of the control box with the control box cooling zone, and the air outlet structure connects the motor cooling zone with the outer wall of the base so that air can enter the control box cooling zone from the outside of the control box and enter the motor cooling zone through the air duct and finally blow to the outer wall of the base, which can better utilize the space between the base and the control box, strengthen the air flow in the space, and form air flow channels in the rear end cover and the outside of the base respectively, effectively improving the heat dissipation effect.

[0008] In the above-mentioned motor heat dissipation structure, the rear end of the rear end cover is open, and the control box is connected to the open end of the rear end cover, and the control box is provided with a plurality of adjacent air inlet heat dissipation strips on the circumferential outer side, and the air inlet structure includes an air inlet channel opened between adjacent air inlet heat dissipation strips, and the air inlet channel is provided with an air inlet connected to the control box cooling zone at one end close to the rear end cover, and the control box cooling zone is also provided with a control box heat dissipation structure located on the end surface of the control box facing the partition body. The wind enters the control box cooling zone from the air inlet between the air inlet heat dissipation strips, and then enters the motor cooling zone through the air duct. In the process of entering the control box cooling zone, the fluid can also dissipate the heat of the control box through the control box heat dissipation structure.

[0009] In the above-mentioned motor heat dissipation structure, the front end of the rear cover is provided with an end plate, and the outer wall of the base is provided with a plurality of axially extending and spaced heat dissipation ribs, and an air outlet channel is formed between adjacent heat dissipation ribs. The air outlet structure includes an air outlet provided on the end plate, and the air outlet is connected to the air outlet channel, and the air outlet is relatively closed to the inner cavity of the base. The fluid in the cooling area of ​​the control box is sucked in by the heat dissipation fan and blown to the motor cooling area, and the fluid in the motor cooling area is blown out through the air outlet and enters the air outlet channel between the heat dissipation ribs. The air outlet here is relatively closed to the inner cavity of the base, which can reduce the flow loss of the flow field, form a dynamic seal, reduce backflow, and thus increase the air volume.

[0010] In the above motor heat dissipation structure, the opening direction of the air outlet is parallel to the extension direction of the air outlet channel, and the air outlet is multiple and respectively arranged in the circumferential direction of the end plate. The air outlet is parallel to the air outlet channel on the base, and the wind blows toward the heat dissipation ribs on the base, so the cooling effect of the motor is good.

[0011] In the above motor heat dissipation structure, the control box heat dissipation structure includes a plurality of strip convex ribs arranged on the end surface of the control box, the strip convex ribs are arranged at intervals, and an air inlet cooling flow channel is formed between adjacent strip convex ribs, and the air inlet cooling flow channel is connected to the air inlet. The fluid enters the air inlet cooling flow channel of the strip convex ribs in the cooling area of ​​the control box from the air inlet, so that the wind can also dissipate heat for the control box in the process of entering the motor cooling area, thereby improving the utilization rate.

[0012] In the above motor heat dissipation structure, the heat dissipation fan, the air duct, and the rotor shaft are coaxially arranged, and the heat dissipation fan includes a base and a plurality of fan blades arranged on the base. The base is truncated cone-shaped, and the diameter of the base gradually increases from the end close to the partition body to the end close to the motor body. The circumferential outer side of the large end of the base is connected to a ring-shaped wind plate body, and the fan blades are connected between the wind plate body and the inclined surface of the base. When the wind enters the motor cooling zone from the control box cooling zone, the diameter of the base gradually increases from the end close to the partition body to the end close to the motor body to prevent the backflow of the wind volume, and the wind is guided to the outlet by the inclined surface to reduce excessive loss in the motor cooling zone.

[0013] In the above motor heat dissipation structure, the rotor shaft is arranged in the middle of the base, and the rotor shaft passes through the shaft hole opened in the rear end cover, and the shaft hole is provided with a ring-shaped end cover at one end close to the base, and a through hole is opened in the middle of the end cover, and the diameter of the through hole is smaller than the diameter of the large end of the base. Therefore, the air volume loss between the base and the through hole is small, so that the air volume at the air outlet is larger.

[0014] In the above motor heat dissipation structure, the gap between the end surface of the fan blade close to the end plate and the end surface of the end plate is 1-2mm. The fan blade is connected with the end plate gap, which makes the air intake efficiency higher and reduces the loss of air after entering the air duct.

[0015] In the above motor heat dissipation structure, the rear end cover is square. The rotation wind direction of the heat dissipation fan and the square structure of the rear end cover can obtain the highest pressure at the air outlet, with small pressure loss and large air volume.

[0016] Compared with the existing technology, the advantages of the motor heat dissipation structure are: 1. Reasonable design. The partition body divides the cavity in the middle of the rear end cover into the control box cooling zone and the motor cooling zone. The air flows smoothly, and the hot air will not flow back and accumulate in the rear end cover, which has higher heat dissipation. 2. The space between the base and the control box can be better utilized, the air flow in the space can be strengthened, and air flow channels can be formed inside the rear end cover and outside the base respectively, which effectively improves the heat dissipation effect. 3. The rotating wind direction of the cooling fan and the square structure of the rear end cover can obtain the highest pressure at the air outlet, with small pressure loss and large air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a quarter cross-sectional view provided by the present invention;

[0018] Figure 2 It is a half-section diagram provided by the present invention;

[0019] Figure 3 It is an exploded diagram provided by the present invention;

[0020] Figure 4 It is a schematic diagram of the overall structure provided by the present invention;

[0021] Figure 5 is a schematic structural diagram of the rear end cover provided by the present invention;

[0022] Figure 6 It is a structural schematic diagram of the heat dissipation fan provided by the present invention;

[0023] Figure 7 It is a pressure cloud diagram in the motor cooling area provided by the present invention;

[0024] Figure 8 It is a cloud diagram of wind speed in the rear end cover provided by the present invention;

[0025] In the figure, the rear end cover 1, the base 2, the motor body 3, the control box 4, the partition body 5, the motor cooling area 6, the control box cooling area 7, the rotor shaft 8, the cooling fan 9, the air inlet structure 10, the air outlet structure 11, the air duct 12, the air inlet heat dissipation strip 13, the air inlet channel 14, the air inlet 15, the control box heat dissipation structure 16, the end plate 17, the heat dissipation rib 18, the air outlet channel 19, the air outlet 20, the strip rib 21, the air inlet cooling flow channel 22, the base 23, the fan blade 24, the wind plate body 25, the shaft hole 26, the end cover 27, and the through hole 28. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-8 As shown, the heat dissipation structure of the motor includes a base 2 with a rear end cover 1, a motor body 3 is arranged in the base 2, a control box 4 is connected to the end of the rear end cover 1 away from the base 2, the rear end cover 1 is hollow and a partition body 5 is arranged on the inner side, a motor cooling zone 6 located at the front end of the rear end cover 1 is formed on the side of the partition body 5 facing the base 2, a control box cooling zone 7 located at the rear end of the rear end cover 1 is formed on the side of the partition body 5 facing the control box 4, a heat dissipation fan 9 connected to the rotor shaft 8 of the motor body 3 is arranged in the motor cooling zone 6, the motor cooling zone 6 and the control box cooling zone 7 are connected and a flow guide mechanism is arranged between the two.

[0028] The partition body 5 divides the cavity in the middle of the rear end cover 1 into a control box cooling zone 7 and a motor cooling zone 6. The cooling fan 9 blows the air entering from the control box cooling zone 7 to the motor cooling zone 6. The air flows smoothly, and the hot air will not flow back and accumulate in the rear end cover 1, which has higher heat dissipation. The cooling fan 9 is arranged in the motor cooling zone 6, and the flow loss of the flow field is small.

[0029] The flow guiding mechanism here includes an air inlet structure 10 connecting the outer wall of the control box 4 with the control box cooling zone 7 and an air outlet structure 11 connecting the motor cooling zone 6 with the outer wall of the base 2. The partition body 5 is provided with an air duct 12 connecting the control box cooling zone 7 and the motor cooling zone 6. The air inlet structure 10 connects the outer wall of the control box 4 with the control box cooling zone 7, and the air outlet structure 11 connects the motor cooling zone 6 with the outer wall of the base 2 so that air can enter the control box cooling zone 7 from the outside of the control box and enter the motor cooling zone 6 through the air duct 12 and finally blow to the outer wall of the base 2, which can better utilize the space between the base 2 and the control box 4, strengthen the air flow in the space, and form air flow channels in the rear end cover 1 and the outside of the base 2 respectively, effectively improving the heat dissipation effect.

[0030] Preferably, the rear end of the rear cover 1 is open, and the control box 4 is connected to the open end of the rear cover 1. A plurality of adjacent air inlet heat dissipation strips 13 are provided on the outer side of the control box 4. The air inlet structure 10 includes an air inlet channel 14 opened between adjacent air inlet heat dissipation strips 13. The air inlet channel 14 is opened at one end close to the rear cover 1 with an air inlet 15 connected to the control box cooling zone 7. The control box cooling zone 7 is also provided with a control box heat dissipation structure 16 located on the end surface of the control box 4 facing the partition body 5. The wind enters the control box cooling zone 7 from the air inlet 15 between the air inlet heat dissipation strips 13, and then enters the motor cooling zone 6 through the air duct 12. In the process of entering the control box cooling zone 7, the fluid can also dissipate heat from the control box 4 through the control box heat dissipation structure 16.

[0031] Furthermore, an end plate 17 is provided at the front end of the rear end cover 1. If there are a number of axially extending and spaced heat dissipation ribs 18 on the outer wall of the base 2, an air outlet channel 19 is formed between adjacent heat dissipation ribs 18. The air outlet structure 11 includes an air outlet 20 opened on the end plate 17. The air outlet 20 is connected to the air outlet channel 19, and the air outlet 20 is relatively closed to the inner cavity of the base 2. The fluid in the control box cooling zone 7 is sucked into the cooling fan 9 and blown toward the motor cooling zone 6. The fluid in the motor cooling zone 6 is blown out through the air outlet 20 and enters the air outlet channel 19 between the heat dissipation ribs 18. The air outlet 20 here is relatively closed to the inner cavity of the base 2, which can reduce the flow loss of the flow field, form a dynamic seal, reduce backflow, and thus increase the air volume. The opening direction of the air outlet 20 is parallel to the extension direction of the air outlet channel 19. There are several air outlets 20 and they are respectively arranged in the circumferential direction of the end plate 17. The air outlet 20 is parallel to the air outlet channel 19 on the base 2. The wind blows toward the heat dissipation ribs 18 on the base 2, and the cooling effect of the motor is good.

[0032] The control box heat dissipation structure 16 includes a plurality of strip convex ribs 21 arranged on the end surface of the control box 4. The strip convex ribs 21 are arranged at intervals, and an air inlet cooling flow channel 22 is formed between adjacent strip convex ribs 21. The air inlet cooling flow channel 22 is connected to the air inlet 15. The fluid enters the air inlet cooling flow channel 22 of the strip convex ribs 21 in the control box cooling zone 7 from the air inlet 15, so that the wind can also dissipate heat for the control box 4 in the process of entering the motor cooling zone 6, thereby improving the utilization rate.

[0033] Furthermore, the cooling fan 9, the air duct 12, and the rotor shaft 8 are coaxially arranged. The cooling fan 9 includes a base 23 and a plurality of fan blades 24 arranged on the base 23. The base 23 is truncated cone-shaped, and the diameter of the base 23 gradually increases from the end close to the partition body 5 to the end close to the motor body 3. The circumferential outer side of the large head end of the base 23 is connected to a ring-shaped wind plate body 25, and the fan blades 24 are connected between the wind plate body 25 and the inclined surface of the base 23.

[0034] When the wind enters the motor cooling zone 6 from the control box cooling zone 7, the diameter of the base 23 gradually increases from the end close to the partition body 5 to the end close to the motor body 3 to prevent the backflow of air, and the wind is guided to the air outlet 20 by the inclined surface to reduce excessive loss in the motor cooling zone 6.

[0035] The rotor shaft 8 is passed through the middle of the base 23, and the rotor shaft 8 passes through the shaft hole 26 opened in the rear end cover 1. An annular end cover 27 is provided at one end of the shaft hole 26 close to the base 23. A through hole 28 is opened in the middle of the end cover 27, and the diameter of the through hole 28 is smaller than the diameter of the large end of the base 23. Therefore, the air volume loss between the base 23 and the through hole 28 is small, so that the air volume of the air outlet 20 is larger.

[0036] In addition, the gap between the end surface of the fan blade 24 close to the end plate 17 and the end surface of the end plate 17 is 1-2mm, and the fan blade 24 is connected with the end plate 17 gap, so that the air intake efficiency is higher and the air volume loss after entering the air duct can be reduced. The rear end cover 1 is square, and the rotation wind direction of the cooling fan 9 and the square structure of the rear end cover 1 can obtain the highest pressure at the air outlet, with small pressure loss and large air volume.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] Although the following terms are used more frequently in this article, such as rear end cover 1, base 2, motor body 3, control box 4, partition body 5, motor cooling area 6, control box cooling area 7, rotor shaft 8, cooling fan 9, air inlet structure 10, air outlet structure 11, air duct 12, air inlet heat dissipation strip 13, air inlet channel 14, air inlet 15, control box heat dissipation structure 16, end plate 17, heat dissipation rib 18, air outlet channel 19, air outlet 20, strip rib 21, air inlet cooling channel 22, base 23, fan blade 24, air plate body 25, shaft hole 26, end cover 27, through hole 28, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A motor heat dissipation structure, comprising a base with a rear end cover, wherein a motor body is arranged in the base, and a control box is connected to one end of the rear end cover away from the base, characterized in that: The rear end cover is hollow and has a partition body inside. The side of the partition body facing the base forms a motor cooling zone located at the front end of the rear end cover. The side of the partition body facing the control box forms a control box cooling zone located at the rear end of the rear end cover. A cooling fan connected to the rotor shaft of the motor body is provided in the motor cooling zone. The motor cooling zone and the control box cooling zone are connected and a flow guide mechanism is provided between the two. The air guide mechanism includes an air inlet structure connecting the outer wall of the control box with the cooling zone of the control box and an air outlet structure connecting the cooling zone of the motor with the outer wall of the base, and an air duct connecting the cooling zone of the control box and the cooling zone of the motor is opened on the partition body; The rear end of the rear end cover is open, and the control box is connected to the open end of the rear end cover. A plurality of adjacent air inlet heat dissipation strips are arranged on the outer circumferential side of the control box. The air inlet structure includes an air inlet channel opened between adjacent air inlet heat dissipation strips. An end of the air inlet channel close to the rear end cover is provided with an air inlet connected to the control box cooling zone. The control box cooling zone is also provided with a control box heat dissipation structure located on the end surface of the control box facing the partition body. The front end of the rear cover is provided with an end plate, the outer wall of the base is provided with a plurality of axially extending and spaced heat dissipation ribs, and an air outlet channel is formed between adjacent heat dissipation ribs, the air outlet structure includes an air outlet opened on the end plate, the air outlet is connected to the air outlet channel, and the air outlet is relatively closed to the inner cavity of the base; The control box heat dissipation structure includes a plurality of strip convex ribs arranged on the end surface of the control box, the strip convex ribs are arranged at intervals, an air inlet cooling flow channel is formed between adjacent strip convex ribs, and the air inlet cooling flow channel is connected to the air inlet; The cooling fan, the air duct and the rotor shaft are coaxially arranged. The cooling fan includes a base and a plurality of fan blades arranged on the base. The base is truncated cone-shaped, and the diameter of the base gradually increases from the end close to the partition body to the end close to the motor body. The circumferential outer side of the large end of the base is connected with a ring-shaped wind plate body, and the fan blades are connected between the wind plate body and the inclined surface of the base. The rotor shaft is passed through the middle of the base and passes through the shaft hole opened in the rear end cover. An annular end cover is provided at one end of the shaft hole close to the base. A through hole is opened in the middle of the end cover, and the diameter of the through hole is smaller than the diameter of the large end of the base.

2. The motor heat dissipation structure according to claim 1, characterized in that: The opening direction of the air outlet is parallel to the extension direction of the air outlet channel, and there are a plurality of air outlets which are respectively arranged in the circumferential direction of the end plate.

3. The motor heat dissipation structure according to claim 1, characterized in that: The gap between the end surface of the fan blade close to the end plate and the end surface of the end plate is 1-2 mm.

4. The motor heat dissipation structure according to claim 1, characterized in that: The rear end cover is square.

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