Cooling structure and motor having the structure

Abstract

This utility model relates to a cooling structure and a motor having the same structure. The structure is installed in a motor, which includes a front cover, a housing, a front bearing, a rear bearing, a stator, and a rear cover. The cooling structure includes: a first cooling channel integrated into the front cover and part of the housing for sequentially cooling the front bearing and a portion of the stator; and a second cooling channel integrated into the rear cover and the remaining portion of the housing for sequentially cooling the rear bearing and the remaining portion of the stator. Compared with existing technologies, this utility model has advantages such as prioritizing the cooling of the bearings before cooling the stator, effectively reducing the bearing operating temperature, and ensuring the reliability of the motor bearing operation.

Description

Technical Field

[0001] This utility model relates to motor cooling technology, and in particular to a cooling structure and a motor having the structure. Background Technology

[0002] Motors typically generate a lot of heat during operation. In some applications, heat dissipation is necessary to prevent motor damage and ensure normal and stable operation. This is especially true for high-speed motors, where the high speed of operation leads to high bearing speed, resulting in severe bearing heating and high temperatures. Since bearing temperature has a significant impact on its lifespan, failure to effectively cool the motor bearings will greatly reduce its service life.

[0003] like Figure 1 As shown, this is an existing motor structure. The motor housing has a spiral cooling channel inside, with the cooling channel structure as follows: Figure 2 As shown, the cooling medium inlet A and cooling medium outlet B are located at both ends of the motor housing. The motor bearings are arranged on the end covers on both sides, and the bearings conduct heat through contact with the end covers. There are no other additional cooling structures, which cannot meet the heat dissipation requirements of the bearings under high-speed operation. When the motor is being cooled, the cooling medium enters the motor from the cooling medium inlet A and exits from the cooling medium outlet B. In this process, only the stator is cooled, and the motor bearings are not cooled, resulting in an increase in bearing temperature and affecting their service life. In addition, the axially arranged spiral cooling channel causes the temperature of the cooling medium to be higher closer to the outlet 12, affecting the cooling effect and causing uneven axial cooling of the motor.

[0004] A search revealed that Chinese Patent Publication No. CN102651579A discloses a cooling mechanism and a motor, specifically including an annular inner cylinder and an outer cylinder coaxially surrounding the inner cylinder; there are at least two sets of flow guiding structures between the inner and outer cylinders, and each set of flow guiding structures forms two interconnected flow channels. The flow channels set in this way are relatively short, thus reducing pressure loss and reducing the temperature difference of the motor in the circumferential direction, making the heat dissipation of the motor in the circumferential direction more uniform. However, this existing patent does not have an effective heat dissipation design for the bearings, and its internal flow channel design is relatively complex and the manufacturing cost is relatively high.

[0005] Therefore, how to simultaneously reduce bearing problems in high-speed motors and solve uneven axial cooling of the motor has become a technical problem that needs to be solved. Utility Model Content

[0006] The purpose of this invention is to overcome the defects of the prior art by providing a cooling structure and a motor having the structure.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] According to one aspect of the present invention, a cooling structure is provided, which is installed in a motor, the motor including a front end cover, a housing, a front bearing, a rear bearing, a stator, and a rear end cover, the cooling structure comprising:

[0009] The first cooling channel, built into the front cover and part of the housing, is used to cool and dissipate heat from the front bearing and part of the stator in sequence.

[0010] In addition, a second cooling channel is built into the rear end cover and the remaining part of the housing, which is used to cool and dissipate heat from the rear bearing and the remaining part of the stator in sequence.

[0011] As a preferred technical solution, the cooling structure further includes a housing outlet for the first cooling channel and the second cooling channel to converge and flow out of the motor. The housing outlet is located on the housing at the intersection of the first cooling channel and the second cooling channel.

[0012] As a preferred technical solution, if the density of the cooling medium is greater than that of air, the housing outlet is located below the housing; if the density of the cooling medium is less than that of air, the housing outlet is located above the housing.

[0013] As a preferred technical solution, the housing outlet is preferably located in the middle of the housing.

[0014] As a preferred technical solution, both the first cooling channel and the second cooling channel include an end cap inlet, a bearing cooling channel, an end cap outlet, a housing inlet, and a housing cooling channel connected in sequence.

[0015] As a preferred technical solution, the bearing cooling channel is a ring-shaped bearing cooling channel.

[0016] As a preferred technical solution, a partition is provided between the end cap inlet and the end cap outlet, and both the front end cap and the rear end cap are provided with cooling caps for sealing the cooling medium in the bearing cooling channel.

[0017] As a preferred technical solution, a sealing structure is provided between the front cover and the corresponding housing cooling channel, and between the rear cover and the corresponding housing cooling channel.

[0018] As a preferred technical solution, the housing includes an outer cylinder and an inner cylinder. The inner cylinder is provided with a threaded spiral flow channel and is assembled with the outer cylinder to form a housing cooling flow channel. The cross-sectional area of ​​the housing cooling flow channel is similar to the cross-sectional area of ​​the housing inlet. The outer surface of the housing is provided with heat dissipation fins.

[0019] According to another aspect of the present invention, an electric motor with a cooling structure is provided, including a front end cover, a housing, a front bearing, a rotor, a rear bearing, a stator, and a rear end cover, the electric motor further including the cooling structure.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1) This utility model sets up two independent cooling channels and cools and dissipates heat from the bearing and stator in sequence, thereby prioritizing the cooling effect of the bearing before cooling the stator, effectively reducing the operating temperature of the bearing and ensuring the reliability of the motor bearing operation. It is particularly suitable for high-speed motors where the bearing temperature rise is more significant.

[0022] 2) The present invention features a dual-path cooling channel, wherein the housing cooling channel adopts a spiral channel. Compared with the prior art, which uses a guide structure to divide the channel, the processing difficulty and processing cost are greatly reduced. At the same time, compared with the single-path channel in the prior art, the present invention reduces the channel length while reducing processing difficulty and cost, thereby reducing the temperature difference of the cooling medium at the inlet and outlet, and avoiding the problems of uneven axial cooling of the motor or high processing difficulty in the prior art.

[0023] 3) This utility model addresses cooling media of different densities by adjusting the outlet position of the cooling media, thus preventing interference between the cooling media when two independent cooling channels converge, making it applicable to cooling media of different densities and having a wider range of applications.

[0024] 4) The outlet of the housing of this utility model is located in the middle of the housing, which can make the axial cooling effect of the motor more uniform, thereby improving the overall cooling effect of the motor.

[0025] 5) The bearing cooling channel of this utility model is a ring-shaped bearing cooling channel, whose shape matches the bearing, which can increase the cooling contact area and thus improve the cooling effect of the bearing.

[0026] 6) A partition is provided between the end cap inlet and the end cap outlet of this utility model to form a bearing flow channel on the end cap, thereby forming an end cap inlet and outlet, and avoiding the mixing of the inlet cooling medium and the outlet cooling medium of the bearing cooling flow channel; at the same time, both the front end cap and the rear end cap are provided with cooling caps to seal the cooling medium in the bearing cooling flow channel, further improving the bearing cooling effect.

[0027] 7) This utility model adjusts the cross-sectional area of ​​the cooling channel at different locations to keep it consistent, so as to avoid the cooling medium from being blocked in the channel and thus preventing the cooling medium from being unable to be discharged smoothly;

[0028] 8) The outer surface of the casing of this utility model is provided with heat dissipation fins, which further improves the heat dissipation effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an existing motor;

[0030] Figure 2 This is a schematic diagram of the cooling channel structure of an existing motor.

[0031] Figure 3 This is a schematic diagram of the motor structure of Embodiment 1 of this utility model;

[0032] Figure 4 This is a schematic diagram of the cooling structure of Embodiment 1 of this utility model;

[0033] Figure 5 This is a schematic diagram of the front cover structure of Embodiment 1 of this utility model;

[0034] Figure 6 for Figure 5 A schematic diagram of the AA cross-sectional structure;

[0035] Figure 7 A schematic diagram of the rear cover structure of Embodiment 1 of this utility model;

[0036] Figure 8 for Figure 7 Schematic diagram of the BB cross-section structure;

[0037] Figure 9 A schematic diagram of the casing structure of Embodiment 1 of this utility model;

[0038] Figure 10 A schematic diagram of the inner cylinder structure of the casing in Embodiment 1 of this utility model;

[0039] Figure 11 This is a schematic diagram of the motor structure of Embodiment 2 of this utility model;

[0040] Figure 12 A schematic diagram of the cooling structure of Embodiment 2 of this utility model;

[0041] Where A is the cooling medium inlet and B is the cooling medium outlet.

[0042] 1-Front end cover; 2-First interface; 3-Sealing ring; 4-Second interface; 5-Housing; 6-Front bearing; 7-Rotor; 8-Rear bearing; 9-Stator; 10-Circuit board assembly; 11-Rear end cover; 12-Mounting screw;

[0043] 101-Front end cover inlet; 102-Front end cover outlet; 103-Front end cover bearing cooling channel; 501-First flow channel of housing; 502-Second flow channel of housing; 503-First inlet of housing; 504-Second inlet of housing; 505-Outlet of housing; 1101-Rear end cover inlet; 1102-Rear end cover outlet; 1103-Rear end cover bearing cooling channel;

[0044] 104 - Front partition; 105 - Front cooling cover;

[0045] 1104 - Rear partition; 1105 - Rear cooling cover;

[0046] 506 Inner cylinder; 507 Outer cylinder; 508 Heat dissipation fins. Detailed Implementation

[0047] 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, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0048] Example 1

[0049] like Figure 3 As shown in the figure, this embodiment provides a cooling structure installed in a motor. The motor includes a front cover 1, a housing 5, a front bearing 6, a rear bearing 8, a stator 9, and a rear cover 11. The cooling structure includes a first cooling channel and a second cooling channel. The first cooling channel is built into the front cover 1 and part of the housing 5, and is used to cool and dissipate heat from the front bearing 6 and a portion of the stator 9 in sequence. The second cooling channel is built into the rear cover 11 and the remaining part of the housing 5, and is used to cool and dissipate heat from the rear bearing 8 and the remaining part of the stator 9 in sequence.

[0050] The cooling structure of this embodiment sets up two independent cooling channels to cool and dissipate heat from the bearing and stator in sequence. Specifically, the bearing cooling channel is set separately on both end covers, and the cooling medium inlet is set on both end covers. This can prioritize the cooling effect of the bearing before cooling the stator, effectively reducing the operating temperature of the bearing and ensuring the reliability of the motor bearing operation. It is particularly suitable for high-speed motors where the bearing temperature rise is more significant.

[0051] Meanwhile, this embodiment changes the conventional single-path cooling channel to a dual-path independent cooling channel. The cooling medium cools the front and rear bearings respectively through the two channels on the front and rear end covers, and then enters the internal channel of the housing from both ends of the housing, and finally exits from the cooling medium outlet located in the housing. In this embodiment, the dual-path arrangement reduces the channel length compared to the single-path channel, reduces the temperature difference of the cooling medium at the inlet and outlet, avoids the problem of uneven axial cooling of the motor in the prior art, and improves the overall cooling effect of the motor.

[0052] The cooling structure in this embodiment is used to achieve efficient cooling of the motor bearing, improve the bearing working environment, and solve the problem of uneven axial cooling of the motor caused by conventional spiral cooling channels.

[0053] As a preferred embodiment, such as Figure 4 As shown, the cooling mechanism is also provided with a housing outlet 505 for the first cooling channel and the second cooling channel to converge and flow out of the motor. The housing outlet 505 is located on the housing 5 at the intersection of the first cooling channel and the second cooling channel. As a further preferred embodiment, the housing outlet 505 is located in the middle of the housing, that is, the cooling medium is discharged from the cooling medium housing outlet located in the middle of the housing, which can make the axial cooling effect of the motor more uniform, thereby improving the overall cooling effect of the motor.

[0054] As a preferred embodiment, such as Figure 4 As shown, the first cooling channel includes a front cover inlet 101, a front cover outlet 102, a front cover bearing cooling channel 103, a housing first channel 501, and a housing first inlet 503. The front cover inlet 101 is connected to the front cover bearing cooling channel 103, the front cover bearing cooling channel 103 is connected to the front cover outlet 102, the front cover outlet 102 is connected to the housing first inlet 503, the housing first inlet 503 is connected to the housing first channel 501, and the housing first channel 501 is connected to the housing outlet 505, thus forming the first cooling channel.

[0055] The second cooling channel includes a rear cover inlet 1101, a rear cover outlet 1102, a rear cover bearing cooling channel 1103, a housing second channel 502, and a housing second inlet 504. The rear cover inlet 1101 is connected to the rear cover bearing cooling channel 1103, the rear cover bearing cooling channel 1103 is connected to the rear cover outlet 1102, the rear cover outlet 1102 is connected to the housing second inlet 504, the housing second inlet 504 is connected to the housing second channel 502, and the housing second channel 502 is connected to the housing outlet 505, thus forming the second cooling channel.

[0056] like Figure 4As shown, the cooling medium in this embodiment has a density greater than that of air, and is preferably a mixture of ethylene glycol and water. The housing outlet 505 is located below the housing 5. When the cooling medium flows to the housing outlet 505, it flows out of the housing under the action of gravity, which can avoid the two cooling media from interfering with each other.

[0057] The specific cooling process is as follows:

[0058] When the motor is being cooled, the cooling medium enters the motor housing from the front cover inlet 101 and flows around the bearing through the front cover bearing cooling channel 103, carrying away the heat generated by the motor bearing and effectively reducing the temperature of the motor bearing. The front cover outlet 102 is connected to the first inlet 503 of the housing, allowing the cooling medium to flow from the front cover into the motor housing, thereby cooling the stator and effectively reducing the temperature of the motor stator. The cooling process of the rear cover bearing cooling circuit is consistent with that of the front cover. The two independent cooling channels converge at the housing outlet 505 and flow out of the motor, thereby achieving overall cooling of the motor.

[0059] As a preferred embodiment, such as Figure 5 As shown, the front cover 1 is provided with a front cover bearing cooling channel 103. This front cover bearing cooling channel 103 is preferably an annular structure, its shape matching the bearing, which can increase the cooling contact area and thus improve the bearing's cooling effect. The front cover bearing cooling channel 103 is connected to both the front cover inlet 101 and the front cover outlet 102. A front partition 104 is provided between the front cover inlet 101 and the front cover outlet 102. Figure 6 As shown, the front cover 1 is provided with a front cooling cover 105 to seal the cooling medium in the front cover bearing cooling channel 103. The sealing method is not limited to welding with the front cover 1. The front cover inlet 101 is connected to the first interface 2 and connected to the outside through a hose. When the motor is running, the cooling medium is filled into the front cover bearing cooling channel 103 through the hose from the inlet channel. By adding an annular channel around the bearing, the cooling medium rotates around the bearing and carries away the heat of the bearing, thereby achieving effective heat dissipation of the front bearing 6.

[0060] As a preferred embodiment, such as Figure 7 As shown, the rear end cover 11 is provided with a rear end cover bearing cooling channel 1103. This rear end cover bearing cooling channel 1103 is preferably an annular structure, its shape matching the bearing, which can increase the cooling contact area and thus improve the bearing's cooling effect. The rear end cover bearing cooling channel 1103 is connected to the rear end cover inlet 1101 and the rear end cover outlet 1102. A rear partition 1104 is provided between the rear end cover inlet 1101 and the rear end cover outlet 1102. Figure 8As shown, the rear end cover 11 is provided with a rear cooling seal 1105 to seal the cooling medium within the rear end cover bearing cooling channel 103. The sealing method is not limited to welding to the rear end cover 11. The rear end cover inlet 1101 is connected to the first interface 2 and to the outside via a hose. During motor operation, the cooling medium is injected into the rear end cover bearing cooling channel 1103 through the hose from the inlet channel. By adding an annular flow channel around the bearing, the cooling medium circulates around the bearing, carrying away the bearing's heat, thereby achieving effective heat dissipation for the rear bearing 11.

[0061] In this embodiment, a partition is provided between the end cap inlet and the end cap outlet to form a bearing flow channel on the end cap, thereby forming an end cap inlet and outlet. This prevents the inlet cooling medium and outlet cooling medium of the bearing cooling flow channel from mixing. At the same time, both the front end cap and the rear end cap are provided with cooling caps to seal the cooling medium in the bearing cooling flow channel, further improving the bearing cooling effect.

[0062] As a preferred embodiment, such as Figure 9 As shown, the first inlet 503 of the housing is connected to the outlet 102 of the front cover. After cooling the bearing 6, the cooling medium can flow into the housing 5 through this channel to cool the stator 9. The sealing method between the front cover 1 and the cooling circuit of the housing 5 is not limited to sealing rings, sealant, gaskets, etc. Similarly, the second inlet 504 of the housing is connected to the outlet 1102 of the rear cover. After cooling the bearing 8, the cooling medium can flow into the housing 5 through this channel to cool the stator 9. The sealing method between the rear cover 11 and the cooling circuit of the housing 5 is not limited to sealing rings, sealant, gaskets, etc. The housing is composed of an outer cylinder 506 and an inner cylinder 507. The inner cylinder is machined with a spiral water channel and assembled with the outer cylinder, and then sealed by welding, thus forming a cooling channel for the housing. In this embodiment, the cooling channel of the housing adopts a spiral channel and uses a threaded machining method. Compared with the existing technology that uses a guide structure to divide the channel, the processing difficulty and processing cost are greatly reduced. At the same time, compared with the single channel in the existing technology, this embodiment reduces the channel length while reducing processing difficulty and cost, thereby reducing the temperature difference of the cooling medium at the inlet and outlet, and avoiding the problems of uneven axial cooling of the motor or high processing difficulty in the existing technology.

[0063] Further preferred embodiments, such as Figure 9 The outer surface of the housing shown is provided with heat dissipation fins 508, which increases the contact area between the housing and the air, and further enhances the cooling effect of the motor.

[0064] As a preferred embodiment, such as Figure 10As shown, the first cooling channel 501 and the second cooling channel 502 of the housing are independently set and converge only at the housing outlet 505. This avoids the problem of mutual interference between the cooling media in the two cooling channels. At the same time, both cooling channels are spiral channels, which are simple in structure and easy to process. The cross-sectional area of ​​the spiral channel is close to that of the housing inlet, which can ensure the smooth flow of the cooling media inside the housing.

[0065] Example 2

[0066] like Figure 11 As shown, when using a cooling medium with a density less than or equal to that of air, compressed air is preferred. Compared with Example 1, only the position of the cooling medium outlet on the housing and the spiral angle of the inner cylinder flow channel need to be adjusted, while the structure of other components remains the same as in Example 1.

[0067] like Figure 12 As shown, the main difference between this embodiment and embodiment 1 is that the cooling medium outlet position is changed from the bottom of the housing in embodiment 1 to the top of the housing. When using a cooling medium with a density greater than air, the outlet is located at the bottom of the housing to ensure that the cooling medium flows out of the motor smoothly under the action of gravity. When using a cooling medium with a density less than air, the outlet is located at the top of the housing to facilitate the discharge of the cooling medium and avoid the cooling medium conflict when the two cooling circuits are merged into one.

[0068] In other words, this embodiment can avoid interference between cooling media when two independent cooling channels converge by adjusting the outlet position of the cooling media for cooling media of different densities, thus making it applicable to cooling media of different densities and having a wider range of application scenarios.

[0069] Example 3

[0070] like Figure 3 or Figure 11 As shown, this embodiment provides a motor with a cooling structure, including a front cover 1, a first interface 2, a sealing ring 3, a second interface 4, a housing 5, a front bearing 6, a rotor 7, a rear bearing 8, a stator 9, a circuit board assembly 10, a rear cover 11, and mounting screws 12. The motor in this embodiment also includes the cooling structure described in embodiment 1 or embodiment 2.

[0071] The motor structure of this embodiment can achieve efficient cooling of the motor bearings, improve the bearing working environment, solve the problem of uneven axial cooling of the motor caused by conventional spiral cooling channels, and provide two different implementation schemes for cooling media of different densities.

[0072] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A cooling structure installed in a motor, the motor comprising a front end cover (1), a housing (5), a front bearing (6), a rear bearing (8), a stator (9), and a rear end cover (11), characterized in that, The cooling structure includes: The first cooling channel, built into the front cover (1) and part of the housing (5), is used to cool and dissipate heat from the front bearing (6) and part of the stator (9) in sequence. And a second cooling channel built into the rear end cover (11) and the remaining part of the housing (5) for cooling the remaining part of the rear bearing (8) and stator (9) in sequence.

2. The cooling structure according to claim 1, characterized in that, The cooling structure also includes a housing outlet (505) for the convergence of cooling media in the first cooling channel and the second cooling channel and for the media to flow out of the motor. The housing outlet (505) is located on the housing (5) at the intersection of the first cooling channel and the second cooling channel.

3. The cooling structure according to claim 2, characterized in that, If the density of the cooling medium is greater than that of air, the housing outlet (505) is located below the housing (5); if the density of the cooling medium is less than that of air, the housing outlet (505) is located above the housing (5).

4. The cooling structure according to claim 2, characterized in that, The housing outlet (505) is located in the middle of the housing (5).

5. The cooling structure according to claim 1, characterized in that, Both the first and second cooling channels include an end cap inlet, a bearing cooling channel, an end cap outlet, a housing inlet, and a housing cooling channel connected in sequence.

6. The cooling structure according to claim 5, characterized in that, The bearing cooling channel is a ring-shaped bearing cooling channel.

7. The cooling structure according to claim 5, characterized in that, A partition is provided between the end cap inlet and the end cap outlet, and both the front end cap (1) and the rear end cap (11) are provided with cooling caps for sealing the cooling medium in the bearing cooling channel.

8. The cooling structure according to claim 5, characterized in that, A sealing structure is provided between the front cover (1) and the corresponding housing cooling channel, and between the rear cover (11) and the corresponding housing cooling channel.

9. A cooling structure according to claim 5, characterized in that, The housing (5) includes an outer cylinder (506) and an inner cylinder (507). The inner cylinder (507) is provided with a threaded spiral flow channel and is assembled with the outer cylinder (506) to form a housing cooling flow channel. The cross-sectional area of ​​the housing cooling flow channel is similar to the cross-sectional area of ​​the housing inlet. The outer surface of the housing (5) is provided with heat dissipation fins (508).

10. An electric motor with a cooling structure, comprising a front end cover (1), a housing (5), a front bearing (6), a rotor (7), a rear bearing (8), a stator (9), and a rear end cover (11), characterized in that, The motor further includes the cooling structure described in any one of claims 1-9.

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