Heat dissipation device and low-speed motor

Abstract

The utility model discloses a heat dissipation device and a low-speed motor. The heat dissipation device comprises a cooler, a pipeline fan and an external pipeline connected between a front end cover and a rear end cover of the motor. The cooler and the pipeline fan are arranged on an external pipeline; the external pipeline is communicated with the internal air duct of the motor. When high-temperature hot air is blown into the external pipeline from the internal air duct, the high-temperature hot air is cooled into low-temperature cold air through the cooler, and then the low-temperature cold air is blown into the internal air duct through the pipeline fan, so that the low-speed motor winding is cooled, a large amount of heat generated by the winding is taken away through heat exchange, and the temperature rise of the low-speed motor winding is reduced; therefore, the risk that the low-speed motor is damaged due to overhigh temperature rise of the winding is reduced, and the working reliability of the low-speed motor is effectively improved.

Description

A heat dissipation device and a low-speed motor Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a heat dissipation device and a low-speed motor. Background Technology

[0002] Low-speed motors typically operate at speeds below 200 rpm and offer advantages such as high torque, high precision, and high stability. They are widely used in heavy machinery, robotics, medical equipment, and other fields.

[0003] If a low-speed motor is underpowered, prolonged overload during operation can lead to excessive winding current and consequently, persistently high winding temperatures. The traditional solution is to install an internal fan on the motor rotor to enhance heat dissipation. However, due to the low speed of low-speed motors, the airflow generated by the internal fan is limited, and its cooling effect on the winding ends is not significant. This results in persistently high winding temperatures, which, over time, accelerates the aging of insulation materials and can even lead to insulation breakdown, winding short circuits, and ultimately, motor burnout, severely impacting the reliability of the low-speed motor. Summary of the Invention

[0004] The purpose of this utility model is to provide a heat dissipation device and a low-speed motor. An external pipe is installed between the front and rear covers of the motor, so that the high-temperature hot air inside the motor is cooled down before being blown into the motor to dissipate heat and cool down the windings of the low-speed motor, thus solving the technical problem of poor working reliability of existing low-speed motors.

[0005] To achieve the above objectives, this utility model provides a heat dissipation device, including a cooler, a duct fan, and an external duct connecting the front and rear covers of the motor; both the cooler and the duct fan are located on the external duct; the external duct is connected to the internal air duct of the motor.

[0006] When high-temperature hot air is blown from the internal air duct into the external duct, the high-temperature hot air is first cooled into low-temperature cold air by the cooler, and then the low-temperature cold air is blown into the internal air duct by the duct fan.

[0007] In some embodiments, the cooler includes a cooling fan and a finned heat sink respectively fixed to the rear end cover; the heat sink fins are in contact with the rear end cover; the external pipe includes a cooling pipe that passes through the finned heat sink; and the cooling fan is used to blow low-temperature airflow from the outside towards the heat sink fins.

[0008] In some embodiments, the external conduit further includes:

[0009] An air inlet duct that is fixedly connected to the front cover;

[0010] An upward-curved pipe that connects vertically between the cooling pipe and the air inlet of the duct fan;

[0011] A downward-curved duct that connects vertically between the air inlet duct and the air outlet of the duct fan.

[0012] In some embodiments, the upper conical tube is provided at the end of the upper curved pipe facing the air inlet, and the large diameter end of the upper conical tube is coaxially connected to the air inlet.

[0013] In some embodiments, the end of the downward-curved pipe facing the air outlet is provided with a downward-conical pipe, and the large-diameter end of the downward-conical pipe is coaxially connected to the air outlet.

[0014] In some embodiments, an upper sealing gasket is provided between the upper conical tube and the air inlet, and a lower sealing gasket is provided between the lower conical tube and the air outlet.

[0015] In some embodiments, the side of the front cover is provided with a radial through hole, and the air inlet duct is integrally fixed in the radial through hole.

[0016] In some embodiments, the rear end cover is provided with an axial through hole, and the end of the cooling pipe away from the upper bend pipe is provided with a connecting bend pipe, which is fixedly connected to the axial through hole; the radial through hole and the axial through hole are respectively located at both ends of the internal air duct.

[0017] In some embodiments, the radial through holes and axial through holes are staggered along the radial direction of the motor, and the internal air duct is an L-shaped air duct.

[0018] This utility model also provides a low-speed motor, including a housing and the aforementioned heat dissipation device, with the heat dissipation device fixed at both ends of the housing.

[0019] Compared with the prior art, the present invention adds a heat dissipation device to the low-speed motor. The heat dissipation device includes a cooler, a duct fan and an external duct connected between the front end cover and the rear end cover of the motor. The external duct is connected to the internal air duct of the motor. The cooler and the duct fan are both located on the external duct.

[0020] When hot air is blown from the internal air duct into the external duct, the hot air is first cooled into cold air by the cooler. The cold air is then blown into the internal air duct by the duct fan to dissipate heat and cool down the low-speed motor windings. Through heat exchange, a large amount of heat generated by the windings is removed, reducing the temperature rise of the low-speed motor windings. This reduces the risk of damage to the low-speed motor due to excessive winding temperature rise and effectively improves the working reliability of the low-speed motor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 is a diagram showing the state of the heat dissipation device provided in this embodiment of the present invention when it is installed at both ends of the motor.

[0023] Figure 2 is a front view of the finned radiator in Figure 1;

[0024] Figure 3 is a view from direction A in Figure 2;

[0025] Figure 4 is the view from direction B in Figure 2;

[0026] Figure 5 is a cross-sectional view of the front end cover in Figure 1;

[0027] Figure 6 is the view from direction C in Figure 5;

[0028] Figure 7 is a view of the upward-curved pipe in Figure 1;

[0029] Figure 8 is a sectional view along the DD direction in Figure 7;

[0030] Figure 9 is a view along direction E in Figure 7;

[0031] Figure 10 is the view from direction F in Figure 7;

[0032] Figure 11 is a view of the downward-bent pipe in Figure 1;

[0033] Figure 12 is a cross-sectional view along the GG direction in Figure 11;

[0034] Figure 13 is the H-direction view in Figure 11;

[0035] Figure 14 is a view along direction I in Figure 11;

[0036] Figure 15 is a view of the duct fan in Figure 1;

[0037] Figure 16 is the J-direction view in Figure 15;

[0038] Figure 17 is a cross-sectional view of the rear end cover in Figure 1;

[0039] Figure 18 is a view along direction K in Figure 17;

[0040] Figure 19 is a cross-sectional view of the duct fan when it is an axial flow fan;

[0041] Figure 20 is a cross-sectional view along line L in Figure 19;

[0042] Figure 21 is a view of the upper sealing gasket in Figure 1.

[0043] The attached figures are labeled as follows:

[0044] Cooler 1, duct fan 2, motor 3, and external duct 4;

[0045] Cooling fan 11 and finned radiator 12;

[0046] Axial flow fan 21;

[0047] Front cover 31 and rear cover 32, internal air duct 33 and housing 34;

[0048] Radial through hole 311;

[0049] Axial through hole 321;

[0050] Cooling pipe 41, air inlet pipe 42, upper bend pipe 43, lower bend pipe 44, upper sealing gasket 45 and lower sealing gasket 46;

[0051] Upper tapered tube 431;

[0052] Lower tapered tube 441. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0054] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] This utility model discloses a heat dissipation device for cooling the windings of a low-speed motor 3. As shown in Figure 1, the heat dissipation device is fixed to the outside of the motor 3, with a front cover 31 and a rear cover 32 fixed to both ends of the motor 3, respectively. Specifically, the front cover 31 adopts a flange design and is fixed to the front end of the motor housing 34 by bolts. The outer end face of the rear cover 32 is provided with several heat dissipation fins to increase the heat dissipation area and conduct heat from the windings and core. All heat dissipation fins are radially arranged to optimize the airflow path and improve the heat dissipation efficiency of the rear cover 32. Both the front cover 31 and the rear cover 32 are equipped with deep groove ball bearings or angular contact bearings, forming a double bearing structure to jointly support the rotation of the motor 3 shaft and enhance the rigidity of the rotor.

[0056] As shown in Figure 1, the heat dissipation device includes a cooler 1, a duct fan 2, and an external duct 4 connected between the front cover 31 and the rear cover 32 of the motor 3. The external duct 4 is connected to the internal air duct 33 of the motor 3 to form a circulating cooling system, which can improve heat dissipation efficiency and prevent external dust and moisture from directly entering the motor 3.

[0057] Both the cooler 1 and the duct fan 2 are located in the external duct 4. The cooler 1 suppresses the temperature rise of the windings through heat exchange with the cooling medium. The duct fan 2 is used to drive the low-temperature cold air and the high-temperature hot air to circulate between the external duct 4 and the internal duct. The duct fan 2 can be a volute fan, but is not limited to this. For example, it can also be an axial flow fan 21, as shown in Figures 19 and 20.

[0058] When high-temperature hot air is blown into the external pipe 4 from the internal air duct 33, the high-temperature hot air is first cooled into low-temperature cold air by the cooler 1. The low-temperature cold air is then blown into the internal air duct 33 by the pipe fan 2 to dissipate heat and cool down the winding of the low-speed motor 3. The heat exchange carries away a large amount of heat generated by the winding, reducing the temperature rise of the winding of the low-speed motor 3, thereby reducing the risk of damage to the low-speed motor 3 due to excessive winding temperature rise, and effectively improving the working reliability of the low-speed motor 3.

[0059] In a preferred embodiment, the cooler 1 includes a cooling fan 11 and a finned heat sink 12, both fixed to the rear end cover 32. As shown in Figures 2 to 4, the heat dissipation fins of the finned heat sink 12 are in contact with the rear end cover 32 to achieve static heat dissipation. As shown in Figure 1, the external pipe 4 includes a cooling pipe 41 that passes through the finned heat sink 12. The cooling pipe 41 exchanges heat with the finned heat sink 12, cooling the high-temperature hot air inside the cooling pipe 41 to a low-temperature cold air. As shown in Figures 15 and 16, the cooling fan 11 blows the low-temperature airflow from the outside towards the heat dissipation fins to achieve convective heat dissipation. The cooler 1 employs the cooling fan 11 and the finned heat sink 12 working together, combining static heat dissipation and convective heat dissipation for higher heat dissipation efficiency.

[0060] In a preferred embodiment, in addition to the cooling pipe 41, the external pipe 4 also includes an air inlet pipe 42, an upper bend pipe 43, and a lower bend pipe 44. The air inlet pipe 42 is fixedly connected to the front end cover 31. The upper bend pipe 43 is vertically connected between the cooling pipe 41 and the air inlet of the duct fan 2, and the lower bend pipe 44 is vertically connected between the air inlet pipe 42 and the air outlet of the duct fan 2, as shown in Figure 1. This allows the low-temperature cold air blown out of the cooling pipe 41 to flow sequentially through the upper bend pipe 43, the duct fan 2, the lower bend pipe 44, and the air inlet pipe 42. That is, both the upper bend pipe 43 and the lower bend pipe 44 are L-shaped bends, used to change the airflow direction within the external pipe 4, shorten the airflow path, and improve heat dissipation efficiency.

[0061] As a preferred embodiment, as shown in Figures 7 to 10, the upper conical pipe 43 is provided with an upper conical pipe 431 at one end facing the air inlet. The large-diameter end of the upper conical pipe 431 is coaxially connected to the air inlet. In the direction of the flow of low-temperature cold air, the upper conical pipe 431 is a gradually expanding pipe. After the low-temperature cold air flows through the upper conical pipe 431, the flow velocity of the low-temperature cold air decreases due to the gradual increase in the cross-section of the upper conical pipe 431, thereby achieving noise reduction and pressure diffusion.

[0062] As a preferred embodiment, as shown in Figures 11 to 14, a lower conical pipe 441 is provided at one end of the lower bend pipe 44 facing the air outlet. The large-diameter end of the lower conical pipe 441 is coaxially connected to the air outlet. In the flow direction of the low-temperature cold air, the lower conical pipe 441 is a tapered pipe. After the low-temperature cold air flows through the lower conical pipe 441, the flow velocity of the low-temperature cold air increases due to the gradual reduction of the cross-section of the lower conical pipe 441, thereby enhancing the heat exchange efficiency.

[0063] An upper sealing gasket 45 is provided between the upper conical tube 431 and the air inlet, and a lower sealing gasket 46 is provided between the lower conical tube 441 and the air outlet to ensure good sealing at the pipe connection of the external pipe 4 and prevent air leakage from the external pipe 4 from affecting the heat exchange efficiency. Both the upper sealing gasket 45 and the lower sealing gasket 46 are circular ring structures, but are not limited to this.

[0064] In addition, sealing gaskets are provided between the cooling pipe 41 and the upper bend pipe 43, and between the lower bend pipe 44 and the air inlet pipe 42, to improve the sealing performance of the external pipe 4.

[0065] As shown in Figures 5 and 6, the side of the front cover 31 is provided with a radial through hole 311, and the air inlet pipe 42 is integrally fixed in the radial through hole 311, so that the low temperature cold air flows into the internal channel of the fan along the radial direction of the front cover 31, so that the airflow can cover the winding and the iron core, and improve the heat exchange efficiency.

[0066] As shown in Figures 17 and 18, the rear end cover 32 is provided with an axial through hole 321. The end of the cooling pipe 41 away from the upper curved pipe 43 is provided with a connecting bend, which is fixedly connected to the axial through hole 321. This allows the high-temperature airflow to directly penetrate the rear end cover 32, increasing the coverage area of ​​the windings and core. Furthermore, the connecting bend creates a spiral airflow path, reducing the residence time of the high-temperature airflow in the cooling pipe 41 and improving heat dissipation efficiency. The radial through hole 311 and the axial through hole 321 are located at opposite ends of the internal air duct 33.

[0067] The radial through holes 311 and the axial through holes 321 are staggered along the radial direction of the motor 3. The internal air duct 33 is L-shaped, which extends the length of the internal air duct 33 and increases the flow time of the low-temperature cold air in the internal air duct 33, ensuring that the low-temperature cold air flows through the high-temperature area inside the motor 3, resulting in higher heat dissipation efficiency.

[0068] This utility model also provides a low-speed motor 3, including a housing 34 and the aforementioned heat dissipation device. The heat dissipation device is fixed at both ends of the housing 34 and has the same beneficial effect.

[0069] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0070] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A heat dissipation device, characterized in that, It includes a cooler (1), a duct fan (2), and an external pipe (4) connecting the front end cover (31) and the rear end cover (32) of the motor (3); the cooler (1) and the duct fan (2) are both located in the external pipe (4); the external pipe (4) is connected to the internal air duct (33) of the motor (3); when high-temperature hot air is blown into the external pipe (4) from the internal air duct (33), the high-temperature hot air is first cooled into low-temperature cold air by the cooler (1), and the low-temperature cold air is then blown into the internal air duct (33) by the duct fan (2).

2. The heat dissipation device according to claim 1, characterized in that, The cooler (1) includes a cooling fan (11) and a finned heat sink (12) respectively fixed to the rear end cover (32); the heat sink fins of the finned heat sink (12) are in contact with the rear end cover (32); the external pipe (4) includes a cooling pipe (41) that passes through the finned heat sink (12); the cooling fan (11) is used to blow low-temperature airflow from the outside towards the heat sink fins.

3. The heat dissipation device according to claim 2, characterized in that, The external pipe (4) further includes: an air inlet pipe (42) fixedly connected to the front end cover (31); an upper bend pipe (43) vertically connected between the cooling pipe (41) and the air inlet of the pipe fan (2); and a lower bend pipe (44) vertically connected between the air inlet pipe (42) and the air outlet of the pipe fan (2).

4. The heat dissipation device according to claim 3, characterized in that, The upper curved pipe (43) has an upper conical pipe (431) at one end facing the air inlet, and the large diameter end of the upper conical pipe (431) is coaxially connected to the air inlet.

5. The heat dissipation device according to claim 4, characterized in that, The lower bend pipe (44) has a lower conical pipe (441) at one end facing the air outlet, and the large diameter end of the lower conical pipe (441) is coaxially connected to the air outlet.

6. The heat dissipation device according to claim 5, characterized in that, An upper sealing gasket (45) is provided between the upper conical tube (431) and the air inlet, and a lower sealing gasket (46) is provided between the lower conical tube (441) and the air outlet.

7. The heat dissipation device according to claim 3, characterized in that, The front cover (31) has a radial through hole (311) on its side, and the air inlet pipe (42) is integrally fixed in the radial through hole (311).

8. The heat dissipation device according to claim 7, characterized in that, The rear end cover (32) is provided with an axial through hole (321), and the cooling pipe (41) is provided with a connecting bend at one end away from the upper bend pipe (43). The connecting bend is fixedly connected to the axial through hole (321). The radial through hole (311) and the axial through hole (321) are located at the two ends of the internal air duct (33), respectively.

9. The heat dissipation device according to claim 8, characterized in that, The radial through hole (311) and the axial through hole (321) are staggered along the radial direction of the motor (3), and the internal air duct (33) is an L-shaped air duct.

10. A low-speed motor (3), characterized in that, It includes a housing (34) and a heat dissipation device as described in any one of claims 1 to 9, the heat dissipation device being fixed at both ends of the housing (34).

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