Slip ring cooler and motor with same

Abstract

The utility model relates to a slip ring cooler for a motor slip ring unit, and the motor slip ring unit comprises a slip ring box which is provided with a first compartment for accommodating a slip ring and a second compartment for accommodating an internal air fan device. The first compartment and the second compartment are in fluid communication so as to form an inner air path section extending from the first compartment to the second compartment under the action of the inner air fan device, the slip ring cooler comprises a cooling box arranged on the outer side of the slip ring box, and an outer air path channel used for outer air path cooling air flow is defined in the cooling box. The slip ring cooler comprises a tubular heat exchanger arranged in the cooling box, fluid on the outer side of a tube of the tubular heat exchanger is outer air path cooling airflow, a fluid inlet on the inner side of the tube of the tubular heat exchanger is in fluid communication with the second compartment, and a fluid outlet on the inner side of the tube of the tubular heat exchanger is in fluid communication with the first compartment, so that a closed inner air path circulation channel is formed. The utility model also relates to a motor with the slip ring cooler.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation, in particular to a slip ring cooler for a slip ring unit of a motor and a motor with the slip ring cooler. Background Art

[0002] As is known, the electric motor comprises a rotating part called a rotor mounted on a rotating shaft and a fixed part called a stator. The motor chamber of the electric motor accommodates the stator and the rotor. The slip ring chamber of the electric motor, which is connected to the motor chamber, accommodates the electrical connections for starting the motor. The rotating shaft extends longitudinally along the electric motor through the motor chamber and the slip ring chamber. The electric motor also includes a cooling system suitable for dissipating the heat generated by the stator and the rotor inside the motor chamber and by the electrical connections inside the slip ring chamber. The cooler used to cool the slip ring chamber in the cooling system is particularly critical because excessive slip ring chamber temperatures can damage the contact between the slip rings mounted on the rotating shaft and the brushes sliding on the slip rings. Non-optimal contact between the brushes and the slip rings can cause sparks to occur when current passes therethrough, damaging the slip rings and thus reducing the life of the slip rings.

[0003] See also Figure 1 , which shows an existing slip ring cooler 20' for cooling a slip ring chamber, which includes a fin-type heat exchange device, which includes a base plate 2012' positioned to close the upper opening of the slip ring chamber, and a plurality of strip-shaped upper fins 2012_1' extending from the upper side of the base plate, the plurality of upper fins extending into the outer cooling channel OW' and arranged at a certain distance, and the cooling airflow sucked by the outer wind fan device 2023' in the outer cooling channel OW' flows through the gaps between the upper fins. A plurality of strip-shaped lower fins 2012_2' extending from the lower side of the base plate toward the inside of the slip ring chamber, the plurality of lower fins arranged at a certain distance, and the airflow in the circulating airflow channel inside the slip ring chamber flows through the gaps between the lower fins. The inner wind fan device 102' causes the airflow to circulate in the circulating airflow channel inside the slip ring chamber. The heat emitted by the slip ring 101' in the slip ring chamber is transferred from the lower fin to the upper fin by convection and heat conduction via the circulating airflow inside the slip ring chamber, and then transferred to the cooling airflow in the outer cooling channel OW', thereby dissipating the heat generated inside the slip ring chamber.

[0004] but Figure 1 The existing slip ring cooler shown has a very limited cooling effect on the slip ring chamber due to the limited fin design size and the characteristics of mainly heat transfer in the form of heat conduction. This cooler design cannot meet the heat dissipation requirements for motors with larger rotor currents.

[0005] Therefore, the present invention is dedicated to one or more improvements to the prior art. Utility Model Content

[0006] In view of the defects of the prior art, the utility model proposes an improved technology for a slip ring cooler of a motor slip ring unit, which makes it possible to obtain higher heat transfer efficiency and better cooling effect without significantly affecting the wind resistance, thereby reducing the risk of overheating of the slip ring unit, thereby extending the service life of the slip ring unit and the entire motor, improving the operating safety and reliability of the motor, and making it possible to provide a high-power product with a larger rotor current.

[0007] According to one aspect of the utility model, a slip ring cooler for a motor slip ring unit is provided, the motor slip ring unit comprises a slip ring box, which has a first compartment accommodating a slip ring and a second compartment accommodating an inner wind fan device, the first compartment and the second compartment are fluidically connected to form an inner wind path section extending from the first compartment to the second compartment under the action of the inner wind fan device, the slip ring cooler comprises a cooling box arranged on the outer side of the slip ring box, the cooling box defines an outer wind path channel for an outer wind path cooling airflow, characterized in that the slip ring cooler comprises a tubular heat exchanger arranged in the cooling box, the fluid outside the tube of the tubular heat exchanger is the outer wind path cooling airflow, the fluid inlet inside the tube of the tubular heat exchanger is fluidly connected to the second compartment, and the fluid outlet inside the tube of the tubular heat exchanger is fluidly connected to the first compartment, thereby, the inner wind path section defined in the slip ring box and the inner passage of the tube of the tubular heat exchanger constitute a closed inner wind path circulation channel.

[0008] According to the utility model, the slip ring cooler has a closed inner air circulation channel, and the closure of the inner air circulation channel can be achieved through a small area connection interface between the cooling box and the slip ring box. In addition, the cooling effect of the slip ring is improved without affecting the wind resistance of the outer air path.

[0009] In an advantageous embodiment, the tube heat exchanger comprises a tube sheet positioned to cover the side opening of the slip ring box to close the first compartment and the second compartment, and a plurality of heat exchange tubes connected and supported on the tube sheet, wherein the tube sheet is provided with orifices for heat exchange tube ports used as tube inner fluid outlets and tube inner fluid inlets to extend through. Thus, the inner air path and the outer air path are isolated by the sealed connection between the tube sheet and the slip ring box and the sealed connection between the tube sheet and the heat exchange tube, and at the same time, the heat exchange between the fluid inside the tube and the fluid outside the tube is achieved by the spatial arrangement of the heat exchange tubes.

[0010] In an advantageous embodiment, the tube sheet is constructed to be integral with the cooling box body. Through this integral configuration, the tube heat exchanger can be pre-installed in the cooling box.

[0011] In an advantageous embodiment, the tubular heat exchanger includes a flow-diverting header located at one end of the heat exchange tube away from the tube sheet, the flow-diverting header having a hollow chamber for realizing fluid diversion between adjacent tube passes of the tubular heat exchanger. The arrangement of the flow-diverting header facilitates flexible design of the number of tube passes of the tubular heat exchanger.

[0012] In an advantageous embodiment, the flow-diverting header is connected to the inner wall of the cooling box or is integrally formed on the inner wall of the cooling box, thereby making full use of the structure of the cooling box body or only requiring a minor modification of the cooling box body to obtain the required flow-diverting header.

[0013] In an advantageous embodiment, the cooling box is detachably connected to the slip ring box. The cooling box is independent of the slip ring box, which is convenient for the staff to disassemble and assemble, saving disassembly and assembly time.

[0014] In an advantageous embodiment, the tube sheet is configured as a box-type tube sheet with hollow compartments, and the hollow compartments are configured to realize fluid diversion between adjacent tube passes of the tube heat exchanger. Thus, by properly arranging the hollow chambers of the diversion header and the hollow compartments of the box-type tube sheet, the number of tube passes of the fluid inside the tube can be increased.

[0015] In an advantageous embodiment, at least some of the heat exchange tubes are provided with heat dissipation fins on their outer sides, and / or the tube sheet includes additional fins extending from the tube sheet body into the cooling box or slip ring box. The provision of these fins can additionally obtain a larger heat exchange area, which is conducive to enhancing the heat exchange effect.

[0016] In an advantageous embodiment, the slip ring cooler further comprises an external air inlet housing, the external air inlet housing is integrally or detachably connected to the cooling box, the flow channel defined in the external air inlet housing is in fluid communication with the external air path defined in the cooling box, an external air fan device is arranged in the external air inlet housing, and the external air fan device is mounted on the rotating shaft of the motor slip ring unit extending into the external air inlet housing. The rotating shaft of the motor slip ring unit is also sleeved with a slip ring and an internal air fan device. Thus, a more compact slip ring cooler can be obtained.

[0017] According to another aspect of the utility model, a motor is provided, comprising a slip ring unit and a slip ring cooler for the slip ring unit, wherein the slip ring cooler is the slip ring cooler mentioned above.

[0018] The slip ring cooler according to the utility model can be made into a separate component and can be easily installed on the slip ring box so that the internal space of the slip ring box and the inner side channel of the tube of the tubular heat exchanger are connected to form a closed internal air circulation channel, and at the same time, the connection between the cooling box body and other adjacent shell components is realized and an external air path with a suitable flow guide length is formed, without the need to modify the design of other parts of the motor cooling system. In addition, the slip ring cooler according to the utility model can not only obtain a better slip ring cooling effect, but also can flexibly layout and design the cooling box configuration according to specific space requirements. As a result, a motor product with a larger rotor current and a better design configuration can be obtained. The motor product according to the utility model therefore has a wider range of applicable occasions and better market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram showing an existing slip ring cooler installed on a motor slip ring unit; and

[0021] Figure 2 A schematic diagram showing a slip ring cooler installed on a motor slip ring unit according to the utility model is shown.

[0022] Reference numerals:

[0023] 10-slip ring unit; 100-slip ring box; 101-slip ring; 101a-slip ring body; 101b-slip ring brush; 102-inner wind fan device; S-partition; Sp-fluid communication opening; A-first compartment; B-second compartment; 20-slip ring cooler; 200-cooling box; 30-rotating shaft; 40-filter box; 400-filter; IW1-inner wind path section; OW-outer wind path channel; 200_1-air flow inlet; 200_2-air flow outlet; 201-tubular heat exchanger; 2010-heat exchange tube; 2011-flow collector; 2012-tube sheet; 202-outer wind inlet box shell; 202_1-air inlet; 202_2-air outlet; 2023-outer wind fan device.

[0024] The accompanying drawings are only schematic and not necessarily drawn to scale, and they only show those parts necessary to illustrate the utility model, and other parts are omitted or only mentioned. That is, in addition to the parts shown in the accompanying drawings, the utility model may also include other parts. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth so that the technical personnel in the relevant technical field can more fully understand the utility model. However, it is obvious to the technical personnel in the relevant technical field that the implementation of the utility model may not have some of these specific details. In addition, it should be understood that the utility model is not limited to the specific embodiments introduced. On the contrary, it can be considered to implement the utility model with any combination of the following features and elements, whether or not they relate to different embodiments.

[0026] Figure 2 The slip ring cooler 20 of the slip ring unit 10 for the motor of the utility model is shown. The slip ring unit 10 includes a slip ring box 100 in the form of a box shell. The rotating shaft 30 extends through the slip ring box 100. The slip ring 101 and the internal wind fan device 102 are sleeved on the rotating shaft 30. A partition plate S is arranged in the slip ring box 100, and the partition plate S roughly divides the internal chamber of the slip ring box 100 into a first compartment A and a second compartment B. The slip ring 101 is arranged in the first compartment A. The internal wind fan device 102 is arranged in the second compartment B.

[0027] The slip ring 101 includes a slip ring body 101a and a slip ring brush 101b. The slip ring body 101a and the slip ring brush 101b are in contact with each other. The slip ring body 101a is configured to rotate driven by the rotating shaft 30, and the slip ring brush 101b is fixedly arranged in the slip ring box 100. During the operation of the slip ring unit 10, sliding electrical contact is achieved by sliding friction between the slip ring brush 101b and the slip ring body 101a. In the embodiment according to the utility model, the slip ring body 101a and the slip ring brush 101b can adopt various known arrangements, and their specific working principles are not summarized here. In the illustrated embodiment, the slip ring brush 101b can be a carbon brush.

[0028] exist Figure 2 In the illustrated embodiment, the upper end side of the slip ring box 100 is open, so the first compartment A and the second compartment B are open toward the upper side. The lower end side of the partition S is spaced apart from the bottom wall of the slip ring box 100, forming a fluid communication opening Sp between the first compartment and the second compartment. A filter box 40 is provided below the slip ring in the first compartment A. The filter box 40 is communicated with the first compartment A and the second compartment B, respectively. A filter 400 is provided in the filter box 40. The filter 400 is used to discharge carbon powder generated by the friction of the brush and the slip ring due to high-speed rotation.

[0029] During the operation of the slip ring unit 10, the rotating shaft 30 can drive the slip ring body 101a and the inner wind fan device 102 to rotate together. The gas in the first compartment A flows into the second compartment B through the slip ring body 101a and the slip ring brush 101b, through the filter box 40 and the fluid communication opening Sp between the two compartments under the suction action of the inner wind fan device 102, and flows to the upper side of the second compartment, thereby forming an inner wind path section IW1 extending from the upper side of the first compartment to the upper side of the second compartment. The gas flowing in the inner wind path section cools the slip ring body and the slip ring brush accommodated in the slip ring box. In addition, the powder generated in the first compartment A of the slip ring box 100 is sucked out from the first compartment of the slip ring box, and the generated powder is collected at the filter box 40.

[0030] exist Figure 2 In the illustrated embodiment, a slip ring cooler 20 is detachably connected to the upper end side of the slip ring box 100. The slip ring cooler 20 includes a cooling box 200 designed in the form of a box shell. An external air path channel OW for external air path cooling air flow is defined in the cooling box 200. The external air path channel OW has an air flow inlet 200_1 and an air flow outlet 200_2 leading to the motor room cooler of the motor.

[0031] The slip ring cooler 20 further includes a tubular heat exchanger 201 arranged in the cooling box 200. Figure 2 In the illustrated embodiment, the tubular heat exchanger 201 includes a plurality of heat exchange tubes 2010 arranged in parallel and at intervals, a flow-reversing header 2011 in fluid communication with the upper ends of the plurality of heat exchange tubes, and a tube sheet 2012 connected to the lower ends of the heat exchange tubes and supporting the plurality of heat exchange tubes. The heat exchange tubes 2010 of the tubular heat exchanger 201 are located in the outer air passage OW, so that the outer air passage cooling airflow flowing in from the airflow inlet 200_1 of the outer air passage passes over the outer wall of the heat exchange tube and performs heat exchange with the fluid inside the tube. Thus, the outer air passage cooling airflow serves as the outer fluid of the tube of the tubular heat exchanger. The flow-reversing header 2011 in the form of a manifold box is connected to the inner wall of the cooling box or is integrally formed on the inner wall of the cooling box. The tube sheet 2012 of the tubular heat exchanger is positioned to cover the upper opening of the slip ring box 100 to close the first compartment A and the second compartment B of the slip ring box. The tube sheet 2012 is provided with an orifice through which the lower end of the heat exchange tube extends. The heat exchange tube port extending through the orifice on the tube sheet and connected to the fluid of the first compartment is used as the fluid outlet on the inside of the tube of the tube heat exchanger. The heat exchange tube port extending through the orifice on the tube sheet and connected to the fluid of the second compartment is used as the fluid inlet on the inside of the tube of the tube heat exchanger.

[0032] When the internal wind fan device 102 rotates, the gas discharged from the upper opening of the second compartment B enters the first group of heat exchange tubes (of the first tube pass) through the fluid inlet on the inner side of the tube, and exchanges heat with the cooling airflow flowing in from the airflow inlet 200_1 of the external air passage. After heat dissipation, the airflow in the first group of heat exchange tubes enters the hollow chamber of the flow transfer manifold 2011, and changes its flow direction in the hollow chamber (see Figure 2 The air in the second group of heat exchange tubes (shown as the curved arrow in the transfer manifold area) is redistributed to enter the second group of heat exchange tubes (the second tube pass). The airflow flowing in the second group of heat exchange tubes exchanges heat with the cooling airflow in the external air path, and the heat is transferred from the inside of the tube to the outside of the tube. The airflow in the tube with a reduced temperature is then discharged through the fluid outlet on the inside of the tube and enters the first compartment A, flushing the slip ring body 101a and the slip ring brush 101b in the first compartment A to cool them. Subsequently, this part of the airflow flows through the filter 400, and under the action of the internal wind fan device 102, it flows into the second compartment B and is discharged from the second compartment and enters the lower port of the first group of heat exchange tubes. In this way, a closed internal air path circulation channel is formed by the internal air path section IW1 and the internal passage of the tube heat exchanger. Along the internal air path circulation channel, the airflow transfers the heat in the first compartment A to the tube heat exchanger 201 and transfers it to the external air path cooling airflow, and is taken away by the external air path cooling airflow.

[0033] Although in Figure 2 In the illustrated embodiment, the number of tube passes of the tubular heat exchanger is 2. It can be understood that the tubular heat exchanger 201 can be designed to have more tube passes. For example, a partition is provided in the flow-reversing header to divide the interior of the flow-reversing header into two mutually sealed flow-reversing chambers, and the tube sheet can be designed as a box-type tube sheet with a hollow compartment. By reasonably setting the number of partitions in the flow-reversing header and reasonably distributing the tube passes of the heat exchange tubes, the gas flowing into the heat exchange tube from the second compartment B of the slip ring box flows along the first tube pass into the first flow-reversing chamber of the flow-reversing header, turns through the first flow-reversing chamber and flows into the heat exchange tube belonging to the second tube pass, enters the hollow compartment of the box-type tube sheet and changes the flow direction, enters the heat exchange tube belonging to the third tube pass and flows into the second flow-reversing chamber of the flow-reversing header, then changes the flow direction and enters the heat exchange tube belonging to the fourth tube pass and flows into the first compartment A of the slip ring box.

[0034] exist Figure 2 In the illustrated embodiment, the heat exchange tubes belonging to different tube passes are arranged side by side in sequence along the flow direction of the cooling airflow of the outer air path. It is understood that the heat exchange tubes belonging to different tube passes can also be arranged side by side in a direction perpendicular to the flow direction of the cooling airflow of the outer air path. In order to strengthen the heat exchange between the fluid in the tube and the fluid outside the tube, it is also advantageous to add heat dissipation fins on the outside of some heat exchange tubes. The tube sheet can be designed to include additional fins protruding from the tube sheet body and extending into the interior of the cooling box or the slip ring box. These additional fins facilitate heat transfer between the cooling airflow of the outer air path and the airflow of the inner air path in the slip ring box through the tube sheet itself.

[0035] like Figure 2 As shown, the slip ring cooler 20 also includes an external air inlet housing 202 arranged on the right end side of the slip ring box 100. The external air inlet housing 202 has an air inlet 202_1 and an air outlet 202_2. The rotating shaft 30 of the slip ring unit 10 extends into the external air inlet housing 202, and an external air fan device 2023 is arranged in the external air inlet housing at the end of the rotating shaft 30 extending into the external air inlet housing. The external air inlet housing is detachably connected to the cooling box, so that the air outlet 202_2 of the external air inlet housing 202 is connected to the air flow inlet 200_1 of the external air path channel OW in the cooling box, thereby making the flow channel defined in the external air inlet housing communicate with the external air path channel defined in the cooling box to form an external air path. The external wind fan device 2023 rotates driven by the rotating shaft 30, and sucks in cooling air from the external environment through the air inlet 202_1. This part of the cooling air flows into the external air path channel OW defined in the cooling box 200 along the flow channel defined in the external wind inlet box shell 202, flows out from the air flow outlet 200_2 of the external air path channel and takes away the heat dissipated by the heat exchange tubes of the tubular heat exchanger, and flows into the downstream motor room cooler (not shown).

[0036] Although the slip ring cooler 20 is Figure 2 The embodiment shown in the figure includes two separate shell components, a cooling box 200 and an external air inlet box shell 202. It can be understood that the cooling box and the external air inlet box shell can also be made into an integrated component.

[0037] In the present invention, the tube sheet 2012 of the tubular heat exchanger is connected or formed as one with the lower side wall of the cooling box 200. Therefore, the entire tubular heat exchanger is equivalent to being completely contained in the cooling box. When the cooling box is connected to the slip ring box in a detachable manner, the staff only needs to align the tube sheet as the connection interface component with the upper opening of the slip ring box when the heat exchange tubes in the tubular heat exchanger are installed in place, ensuring that the fluid inlet on the inner side of the tube is aligned with the upper opening of the second compartment of the slip ring box, and the fluid outlet on the inner side of the tube is aligned with the upper opening of the first compartment of the slip ring box. This detachable connection between the cooling box and the slip ring box is convenient for the staff to disassemble and assemble, and is convenient for maintenance.

[0038] The slip ring cooler of the utility model is a shell and tube heat exchanger as a whole. Figure 2In the slip ring cooler shown, in addition to the feature of detachable connection of the cooling box, the inner air path (i.e., the tube side of the slip ring cooler) and the outer air path (i.e., the shell side of the slip ring cooler) of the slip ring cooler are independently closed and do not interfere with each other. These features are conducive to the flexible design of the cooling box and to obtaining a better cooling effect of the slip ring, thereby keeping the slip ring brushes and the slip ring body in a stable state, ensuring the normal operation of the slip ring and avoiding sparks and other faults. In addition, for larger rotor currents, the slip ring cooler of the utility model can ensure that the brush temperature is within the standard range by adding more heat exchange tubes, which is conducive to the brush obtaining a sufficiently long service life. In addition, compared to Figure 1 Compared with the existing fin-type heat exchange device shown in , the external air path in the slip ring cooler of the utility model is less affected by wind resistance and the material consumption is more economical.

[0039] Although the figure shows that the cooling box is installed on the slip ring box from the upper side of the slip ring box, it can be understood that the position of the cooling box relative to the slip ring box can be changed according to actual needs. For example, the cooling box can be arranged beside the slip ring box, and the tube sheet in the tube heat exchanger can be arranged vertically, while the heat exchange tubes can be arranged horizontally.

[0040] The design of the tubular heat exchanger in the slip ring cooler of the utility model is not limited to the configuration shown. For example, the heat exchange tube of the tubular heat exchanger can be designed to be U-shaped or W-shaped. The flow transfer connecting part provided by the U-tube or W-shaped tube can save the setting of the flow transfer header (or flow transfer chamber).

[0041] In this article, the directional words "upper", "lower", "top", "bottom", "left" and "right" are used only for the convenience of describing the motor. Figure 2 The terms "first", "second", etc. are introduced for the purpose of description only and should not be understood as indicating or implying relative importance.

[0042] Industrial Applicability

[0043] In order to better understand the present invention, Figure 2 The slip ring cooler shown is used as an example to illustrate the working principle and technical advantages of the slip ring cooler of the utility model.

[0044] During operation, the air carrying the heat generated by the brushes and the slip ring body during the operation of the motor is first brought to the filter box along the inner air path section for filtration, effectively collecting the carbon powder, and regularly extracting and cleaning it, effectively avoiding the unsafe hidden dangers such as slip ring explosion caused by carbon powder accumulation due to untimely cleaning of carbon powder. The filtered hot air enters the heat exchange tube inner passage of the tubular heat exchanger in the cooling box through the second compartment of the slip ring box, and becomes cold air after heat exchange with the cooling air flow of the outer air path in the cooling box. This cold air enters the first compartment of the slip ring box to circulate and cool the slip ring body and the brushes again.

[0045] The slip ring cooler according to the utility model has a simple structure, is easy to disassemble and assemble, and has a significantly improved cooling effect. While ensuring the protection level of the slip ring, an increased slip ring cooling capacity is obtained, equipment safety hazards caused by heat discharge of the slip ring are avoided, the safety of large rotor current is improved, and the power range of large rotor current generators is extended.

[0046] The above merely describes an exemplary embodiment of a slip ring cooler according to the utility model. The slip ring cooler is not limited to the specific embodiment described herein. "An example", "another example", "example", etc. mentioned throughout the specification means that a certain element / element (such as a feature, structure and / or characteristic) related to the example is included in at least one example described herein, and may appear and / or may not appear in other examples. In addition, it is understood that multiple elements of any example described may be combined in any suitable manner in multiple different examples, unless the context clearly indicates otherwise.

[0047] The above exemplary embodiments have made a clear and complete description of the utility model. It should be understood by those skilled in the art that various other embodiments can be conceived by modifying the disclosed technical solutions without departing from the spirit and scope of the utility model. These embodiments should be understood to fall within the scope of the utility model determined based on the claims and any equivalent technical solutions thereof.

Claims

1. A slip ring cooler for a motor slip ring unit, the motor slip ring unit comprising a slip ring box, which has a first compartment accommodating a slip ring and a second compartment accommodating an inner wind fan device, the first compartment and the second compartment are fluidically connected to form an inner wind path section extending from the first compartment to the second compartment under the action of the inner wind fan device, the slip ring cooler comprises a cooling box arranged outside the slip ring box, the cooling box defines an outer wind path channel for an outer wind path cooling airflow, characterized in that, The slip ring cooler includes a tubular heat exchanger arranged in the cooling box, the fluid outside the tube of the tubular heat exchanger is an external air path cooling airflow, the fluid inlet inside the tube of the tubular heat exchanger is connected to the second compartment fluid, and the fluid outlet inside the tube of the tubular heat exchanger is connected to the first compartment fluid, thereby, the internal air path section defined in the slip ring box and the internal passage of the tube of the tubular heat exchanger constitute a closed internal air path circulation channel.

2. The slip ring cooler according to claim 1, characterized in that: The tube heat exchanger includes a tube sheet positioned to cover a side opening of a slip ring box to close a first compartment and a second compartment, and a plurality of heat exchange tubes connected and supported on the tube sheet, wherein the tube sheet is provided with holes through which heat exchange tube ports serving as tube inner side fluid outlets and tube inner side fluid inlets extend.

3. The slip ring cooler according to claim 2, characterized in that: The tube sheet is constructed to be integral with the cooling box body.

4. The slip ring cooler according to claim 3, characterized in that: The tubular heat exchanger comprises a flow-diverting header located at one end of the heat exchange tube away from the tube sheet, and the flow-diverting header has a hollow chamber for realizing fluid diversion between adjacent tube passes of the tubular heat exchanger.

5. The slip ring cooler according to claim 4, characterized in that: The flow-diverting header is connected to the inner wall of the cooling box or is integrally formed on the inner wall of the cooling box.

6. The slip ring cooler according to claim 5, characterized in that: The cooling box is detachably connected to the slip ring box.

7. The slip ring cooler according to claim 2, characterized in that: The tube sheet is configured as a box-type tube sheet having a hollow compartment, and the hollow compartment is configured to realize fluid diversion between adjacent tube passes of the tube heat exchanger.

8. The slip ring cooler according to any one of claims 2 to 7, characterized in that: At least part of the heat exchange tubes are provided with heat dissipation fins on their outer sides, and / or the tube sheet includes additional fins protruding from the body of the tube sheet and extending into the interior of the cooling box or the slip ring box.

9. The slip ring cooler according to any one of claims 1 to 7, characterized in that: The slip ring cooler also includes an external air inlet box shell, which is integrally or detachably connected to the cooling box, and the flow channel defined in the external air inlet box shell is fluidly connected to the external air path channel defined in the cooling box. An external air fan device is arranged in the external air inlet box shell, and the external air fan device is installed on the rotating shaft of the motor slip ring unit that extends into the external air inlet box shell.

10. A motor, comprising a slip ring unit and a slip ring cooler for the slip ring unit, characterized in that: The slip ring cooler is a slip ring cooler according to any one of claims 1 to 9.

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