Double-layer full-enclosed cooling high-speed conductive slip ring

Abstract

The application discloses a double-layer full-covering type high-speed conductive slip ring with cooling, relates to the technical field of conductive slip rings, and can solve the problem of the lack of efficient cooling means of the existing high-speed conductive slip ring. The application discloses a double-layer full-covering type high-speed conductive slip ring with cooling, which comprises a shell body provided with a mounting cavity and a cooling oil flow channel, and a core shaft assembly arranged in the mounting cavity of the shell body through a hybrid bearing. The hybrid bearing comprises an outer ring steel body, ceramic balls and an inner ring steel body. The shell body is provided with a first ring groove and a second ring groove, the cooling oil flow channel is directly connected through the first ring groove or the second ring groove, the outer ring steel body of the hybrid bearing is heat-conducted through the cooling oil flowing in the first ring groove and the second ring groove, the shell body is provided with a communication inclined hole, the cooling oil flow channel is indirectly connected through the communication inclined hole, and the core shaft assembly and the inner ring steel body are heat-conducted through the cooling oil in the mounting cavity. The application further comprises a brush wire assembly and an end cover assembly, and the mounting cavity in the shell body is enclosed into a closed cavity through the brush wire assembly and the end cover assembly.

Description

Technical Field

[0001] This invention relates to the field of conductive slip ring technology, and specifically to a high-speed conductive slip ring with double-layer full-enclosed cooling. Background Technology

[0002] High-speed conductive slip rings are electromechanical devices used to achieve continuous signal transmission between rotating and stationary equipment, and are used to collect stress and temperature signals of rotating components. The slip ring and brush are in sliding contact, and there is contact resistance between them. The resistance changes caused by this sliding contact, and the resulting resistance fluctuations, can lead to electrical signal errors in the actuator, and these errors tend to worsen with increasing rotational speed. At ultra-high speeds, such as exceeding 50,000 rpm, a large amount of heat is generated due to the ultra-high-speed rotation. How to dissipate this heat in a timely and efficient manner has been a long-standing problem for engineers.

[0003] Furthermore, at ultra-high speeds, special ceramic hybrid bearings are required for high-speed conductive slip rings to ensure stable rotation. The balls of ceramic hybrid bearings are made of silicon nitride ceramic material, which has better temperature rise performance, longer service life, and better rotational stability compared to conventional bearings. However, due to the ultra-high speeds, the ceramic hybrid bearings and other parts of the high-speed conductive slip ring will still generate a continuous stream of heat, which needs to be dissipated in time. Moreover, due to the special nature of ceramic hybrid bearings, they are extremely sensitive to thermal stress. If the heat cannot be dissipated quickly, the ceramic balls are prone to crushing or seizing due to local overheating.

[0004] Based on the above background, the inventors designed a high-speed conductive slip ring with double-layer full-enclosed cooling to solve the above problems, and thus, this application is filed. Summary of the Invention

[0005] The purpose of this application is to provide a high-speed conductive slip ring with double-layer full-enclosed cooling, which solves the problem of the lack of efficient cooling methods for ultra-high-speed conductive slip rings in the prior art.

[0006] To address the above problems, this application provides the following technical solution:

[0007] This application provides a high-speed conductive slip ring with double-layer full-enclosed cooling, including a housing with a mounting cavity and two cooling oil channels, and a spindle assembly disposed in the mounting cavity of the housing and rotatable by two hybrid bearings.

[0008] The hybrid bearing comprises an outer steel ring, ceramic balls, and an inner steel ring arranged sequentially from the outside to the inside.

[0009] The housing is provided with a first annular groove and a second annular groove that communicate with the cooling oil flow channel, and two hybrid bearings are respectively installed in the first annular groove and the second annular groove.

[0010] When the hybrid bearing is installed in the first and second annular grooves, the two cooling oil channels are directly connected through the first and / or second annular grooves, and the outer ring steel of the hybrid bearing is heated by the cooling oil flowing through the first and second annular grooves.

[0011] The mounting cavity is located between two cooling oil channels. The housing is also provided with at least two connecting oblique holes for connecting the mounting cavity and the two cooling oil channels. The two cooling oil channels are indirectly connected through the connecting oblique holes. The mandrel assembly and the inner ring steel of the hybrid bearing are filled with cooling oil in the mounting cavity through the connecting oblique holes for heat conduction.

[0012] It also includes a brush assembly mounted on the housing and end cap assemblies located at both ends of the housing. The mounting cavity inside the housing is enclosed by the brush assembly and the end cap assemblies to form a closed cavity for containing cooling oil.

[0013] Optionally, the end cap assembly includes a first end cap and a second end cap that are detachably fixed to the end of the housing, with the second end cap fitted onto the spindle assembly and rotatably connected thereto.

[0014] It also includes a sealing assembly for improving sealing performance, the sealing assembly including a sealing ring body, a first sealing gasket and a second sealing gasket;

[0015] The sealing ring is fitted onto the spindle assembly and located inside the second end cap;

[0016] The first sealing gasket is disposed between the first end cap and the end of the housing, and the second sealing gasket is disposed between the second end cap and the end of the housing.

[0017] Optionally, the sealing assembly further includes a third sealing gasket disposed between the bristle assembly and the housing;

[0018] The two ends of the housing are respectively provided with a first flange and a second flange, a first end cover is installed on the first flange, and a second end cover is installed on the second flange;

[0019] The first sealing gasket is located between the first flange and the first end cap;

[0020] The second sealing gasket is located between the second flange and the second end cap.

[0021] Optionally, the first, second, and third sealing gaskets are all asbestos paper sealing gaskets.

[0022] Optionally, the second end cap is provided with a sealing ring mounting groove for mounting the sealing ring body;

[0023] The sealing ring mounting groove is an annular groove;

[0024] The sealing ring body is an O-ring, and the limiting linear velocity of the sealing ring body is greater than 18.3 m / s.

[0025] Optionally, the bristle assembly includes a bristle mounting plate, a filling colloid, a plurality of sleeve tubes, and a plurality of bristle bodies;

[0026] The bristle body is fixed to the filling colloid via a sleeve, the filling colloid is fixed inside the bristle mounting plate, and the bristle mounting plate is detachably fixed to the housing.

[0027] The mounting cavity inside the housing is formed into a closed cavity by the brush mounting plate, the filling colloid, and the end cap assembly;

[0028] The end of the bristle body away from the filling colloid is spring-loaded into contact with the spindle assembly.

[0029] Optionally, the bristle body is inclined and spring-loaded into contact with the spindle assembly;

[0030] The vertical line connecting the fixed end of the bristle body and the central axis of the spindle assembly forms an angle with the axis of the bristle body, the angle ranging from 6° to 15°.

[0031] Optionally, the mandrel assembly includes a mandrel body and a sealant structure mounted on the mandrel body, as well as a plurality of conductive rings evenly spaced along the axial direction of the mandrel body;

[0032] The hybrid bearing is mounted on the spindle body, and the conductive ring and sealant structure are both located between the two hybrid bearings;

[0033] Several conductive rings are insulated from each other by a sealant structure;

[0034] The bristle assembly is located between two hybrid bearings and its free end is in spring-loaded contact with the conductive ring.

[0035] Optionally, the spindle body is provided with a wire-passing hole coaxial with its central axis and a strip-shaped eccentric wire-passing groove.

[0036] The conductive ring is connected to the outside through an eccentric wire groove and a wire hole.

[0037] Optionally, it also includes an oil inlet connector and an oil outlet connector respectively installed on the housing, with the oil inlet connector and the oil outlet connector respectively installed at the end interfaces of the two cooling oil flow channels.

[0038] The beneficial effects of this invention are:

[0039] I. This application employs a housing with two cooling oil channels, and further includes a first annular groove and a second annular groove within the housing. After two hybrid bearings are installed into the first and second annular grooves of the housing, the two cooling oil channels can directly conduct cooling oil through either the first or second annular groove, or both simultaneously. This allows the outer ring steel of the two hybrid bearings to directly conduct heat through the cooling oil in the channels, which constitutes the first layer of cooling and heat dissipation in this application. Furthermore, this application includes a connecting oblique hole between the mounting cavity and the cooling oil channels within the housing, allowing the two cooling oil channels to indirectly conduct heat through the connecting oblique hole and the mounting cavity. This design allows the cooling oil in the cooling oil channel to first enter the mounting cavity through the connecting oblique hole to conduct heat to the spindle assembly and the inner ring steel of the hybrid bearing within the mounting cavity, and then be discharged into another cooling oil channel through another connecting oblique hole, thus achieving the second layer of cooling and heat dissipation in this application. In other words, by designing the above-mentioned channel structure, this application can achieve all-round enclosed cooling and heat dissipation for the spindle body and the hybrid bearing in the high-speed slip ring, avoiding the problem of poor heat dissipation of the spindle assembly, and also avoiding the problem of the ceramic balls of the hybrid bearing being stuck or even crushed due to inconsistent heat dissipation between the inner and outer ring steel.

[0040] II. This application also includes a sealing assembly, which comprises a sealing ring body, a first sealing gasket, a second sealing gasket, and a third sealing gasket. The spindle body and the second end cover rotate at high speed relative to each other. The sealing ring body in this application is required to have a maximum linear velocity exceeding 18.3 m / s during selection to ensure that no cooling oil leakage occurs between the spindle body and the second end cover under high-speed rotation. The first, second, and third sealing gaskets ensure that no cooling oil leakage occurs between the first end cover and the first flange, between the second end cover and the second flange, and between the brush mounting plate and the housing. This ensures that the mounting cavity within the housing is in a highly sealed environment, thereby ensuring the cooling and heat conduction effect of this application.

[0041] Third, in the brush bristle assembly of this application, the brush bristle body is tilted and spring-loaded into contact with the conductive ring of the spindle assembly. Even after the free end of the brush bristle body is worn due to high-speed rotation, the brush bristle body can still spring-load into contact with the conductive ring and maintain good conductive contact. The only difference is that the tilt angle of the brush bristle body is reduced. The tilted brush bristle assembly setting can improve the stability of the entire high-speed conductive slip ring operation. Attached Figure Description

[0042] Figure 1 This is a three-dimensional structural diagram of an embodiment of this application.

[0043] Figure 2 This is a cross-sectional structural diagram of an embodiment of this application.

[0044] Figure 3 This is a top view of an embodiment of the present application.

[0045] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of AA.

[0046] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of BB.

[0047] Figure 6 This is a three-dimensional structural diagram of the housing after the mandrel assembly is installed in an embodiment of this application.

[0048] Figure 7 This is a three-dimensional structural diagram of the embodiment of this application after being connected to the drive motor.

[0049] Explanation of reference numerals in the attached drawings: 1-Shell, 11-First flange, 12-Second flange, 13-Cooling oil flow channel, 131-First annular groove, 132-Second annular groove, 133-Connecting oblique hole, 14-Mounting cavity, 21-First end cap, 22-Second end cap, 221-Sealing ring mounting groove, 3-Brush bristle assembly, 31-Brush bristle mounting plate, 32-Filling colloid, 33-Supply tube, 34-Brush bristle body, 41-Oil inlet connector, 42-Oil outlet connector 51-Sealing ring body, 52-First sealing gasket, 55-Second sealing gasket, 54-Third sealing gasket, 6-Hybrid bearing, 61-Outer ring steel body, 62-Inner ring steel body, 63-Ceramic ball, 7-Mandrel assembly, 71-Mandrel body, 711-Wire passage hole, 712-Eccentric wire passage groove, 72-Sealing adhesive structure, 73-Conductive ring, 81-Coupling, 82-Drive motor, 91-Base plate, 92-U-shaped bracket, 93-L-shaped mounting bracket. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0051] like Figures 1 to 7 As shown, this embodiment provides a high-speed conductive slip ring with double-layer full-enclosed cooling, including a housing 1 having a mounting cavity 14 and two cooling oil channels 13, and a spindle assembly 7 rotatably disposed in the mounting cavity 14 of the housing 1 via two hybrid bearings 6.

[0052] The hybrid bearing 6 includes an outer ring steel body 61, ceramic balls 63 and an inner ring steel body 62 arranged sequentially from the outside to the inside;

[0053] The housing 1 is provided with a first annular groove 131 and a second annular groove 132 that communicate with the cooling oil flow channel 13, and two hybrid bearings 6 are respectively installed in the first annular groove 131 and the second annular groove 132.

[0054] When the hybrid bearing 6 is installed in the first annular groove 131 and the second annular groove 132, the two cooling oil channels 13 are directly connected through the first annular groove 131 and / or the second annular groove 132, and the outer ring steel body 61 of the hybrid bearing 6 conducts heat through the cooling oil flowing through the first annular groove 131 and the second annular groove 132.

[0055] The mounting cavity 14 is located between two cooling oil channels 13. The housing 1 is also provided with at least two connecting oblique holes 133 for connecting the mounting cavity 14 and the two cooling oil channels 13. The two cooling oil channels 13 are indirectly connected through the connecting oblique holes 133. The mandrel assembly 7 and the inner ring steel body 62 of the hybrid bearing 6 are filled with cooling oil in the mounting cavity 14 through the connecting oblique holes 133 for heat conduction.

[0056] It also includes a brush bristle assembly 3 mounted on the housing 1 and end cap assemblies located at both ends of the housing 1. The mounting cavity 14 inside the housing 1 is enclosed by the brush bristle assembly 3 and the end cap assembly to form a closed cavity for containing cooling oil.

[0057] This embodiment features a housing 1 with two cooling oil channels 13. The housing 1 also contains a first annular groove 131 and a second annular groove 132. After the two hybrid bearings 6 are installed into the first and second annular grooves 131 and 132 of the housing 1, the two cooling oil channels 13 can directly conduct cooling oil through either the first or second annular groove 131, or both simultaneously. This allows the outer ring steel bodies 61 of the two hybrid bearings 6 to directly conduct heat through the cooling oil in the cooling oil channels 13, which constitutes the first layer of cooling and heat dissipation in this embodiment. Furthermore, this embodiment includes a connecting oblique hole 133 between the mounting cavity 14 and the cooling oil channels 13 within the housing 1, allowing the two cooling oil channels 13 to pass through the connecting oblique hole 133. The 33 and the mounting cavity 14 are indirectly connected, so that in this embodiment, the cooling oil in the cooling oil channel 13 can first enter the mounting cavity 14 through the connecting oblique hole 133 to conduct heat to the spindle assembly 7 and the inner ring steel body 62 of the hybrid bearing 6 in the mounting cavity 14, and then be discharged from another connecting oblique hole 133 into another cooling oil channel 13 to achieve the second layer of cooling and heat dissipation of this application. That is, by designing the above-mentioned channel structure, this embodiment can achieve full-enclosed cooling and heat dissipation for the spindle body 71 and the hybrid bearing 6 in the high-speed slip ring, and there will be no problem of poor heat dissipation effect of the spindle assembly 7. At the same time, there will be no problem of the ceramic ball 63 being stuck or even crushed due to the inconsistent heat dissipation of the inner ring steel body 62 and the outer ring steel body 61 of the hybrid bearing 6.

[0058] In this embodiment, the end cap assembly includes a first end cap 21 and a second end cap 22 that are detachably fixed to the end of the housing 1. The second end cap 22 is fitted onto the spindle assembly 7 and is rotatably connected to it.

[0059] It also includes a sealing assembly for improving sealing performance, the sealing assembly including a sealing ring body 51, a first sealing gasket 52 and a second sealing gasket 55;

[0060] The sealing ring is fitted onto the spindle assembly 7 and located inside the second end cap 22;

[0061] The first sealing gasket 52 is disposed between the first end cap 21 and the end of the housing 1, and the second sealing gasket 55 is disposed between the second end cap 22 and the end of the housing 1.

[0062] Specifically, the sealing assembly further includes a third sealing gasket 54, which is disposed between the bristle assembly 3 and the housing 1;

[0063] The two ends of the housing 1 are respectively provided with a first flange 11 and a second flange 12, a first end cover 21 is installed on the first flange 11, and a second end cover 22 is installed on the second flange 12;

[0064] The first sealing gasket 52 is located between the first flange 11 and the first end cap 21;

[0065] The second sealing gasket 55 is located between the second flange 12 and the second end cap 22.

[0066] In this embodiment, the first flange 11 and the second flange 12 are both integral structures on the housing 1, ensuring the sealing performance of the housing 1 and avoiding the need to set more sealing rings or gaskets, which would affect the sealing effect of the mounting cavity 14 inside the housing 1.

[0067] In this embodiment, due to the high-speed relative rotation between the spindle body 71 and the second end cover 22, the sealing ring body 51 in this application is required to have a limit linear velocity exceeding 18.3 m / s during selection. This ensures that no cooling oil leakage will occur between the spindle body 71 and the second end cover 22 under high-speed rotation. The first sealing gasket 52, the second sealing gasket 55, and the third sealing gasket 54 ensure that no cooling oil leakage will occur between the first end cover 21 and the first flange 11, between the second end cover 22 and the second flange 12, and between the brush mounting plate 31 and the housing 1. This ensures that the mounting cavity 14 inside the housing 1 is in a highly sealed environment, thereby ensuring the cooling and heat conduction effect of this application.

[0068] In this embodiment, the first sealing gasket 52, the second sealing gasket 55, and the third sealing gasket 54 are all asbestos paper sealing gaskets. Technicians may also set the first sealing gasket 52, the second sealing gasket 55, and the third sealing gasket 54 to sealing gaskets of other materials as needed, which will not be elaborated here.

[0069] In this embodiment, the second end cap 22 is provided with a sealing ring mounting groove 221 for mounting the sealing ring body 51;

[0070] The sealing ring mounting groove 221 is an annular groove;

[0071] The sealing ring body 51 is an O-ring. The limiting linear velocity of the sealing ring body 51 is greater than 18.3 m / s. The sealing ring body 51 with a limiting linear velocity greater than 18.3 m / s is an existing component that can be purchased directly on the market, and will not be described in detail here.

[0072] In this embodiment, the bristle assembly 3 includes a bristle mounting plate 31, a filling colloid 32, a plurality of sleeve tubes 33, and a plurality of bristle bodies 34;

[0073] The bristle body 34 is fixed to the filling colloid 32 by the sleeve tube 33, the filling colloid 32 is fixed in the bristle mounting plate 31, and the bristle mounting plate 31 is detachably fixed to the housing 1.

[0074] The mounting cavity 14 inside the housing 1 is a closed cavity formed by the brush mounting plate 31, the filling colloid 32 and the end cap assembly;

[0075] The end of the bristle body 34 away from the filling colloid 32 is spring-pressed into contact with the spindle assembly 7.

[0076] Specifically, the bristle body 34 is in inclined spring-loaded contact with the spindle assembly 7;

[0077] The vertical line connecting the fixed end of the bristle body 34 and the central axis of the spindle assembly 7 forms an angle with the axis of the bristle body 34, which allows the bristle body 34 to make inclined spring-loaded contact with the spindle assembly 7. In this embodiment, the angle is 9°. Technicians can also set the tilt angle to other angles as needed, which will not be elaborated here.

[0078] In this embodiment, the bristle body 34 is tilted and spring-loaded into contact with the conductive ring 73 of the spindle assembly 7. Even after the free end of the bristle body 34 is worn due to high-speed rotation, the bristle body 34 can still spring-load into contact with the conductive ring 73 and maintain good conductive contact. The only difference is that the tilt angle of the bristle body 34 is reduced. The tilted bristle assembly 3 setting can improve the stability of the entire high-speed conductive slip ring operation.

[0079] In this embodiment, the mandrel assembly 7 includes a mandrel body 71 and a sealant structure 72 mounted on the mandrel body 71, as well as a plurality of conductive rings 73 evenly distributed along the axial direction of the mandrel body 71;

[0080] The hybrid bearing 6 is mounted on the spindle body 71, and the conductive ring 73 and the sealant structure 72 are both located between the two hybrid bearings 6.

[0081] Several conductive rings 73 are insulated from each other by a sealant structure 72;

[0082] The brush assembly 3 is located between two hybrid bearings 6 and its free end is in spring-loaded contact with the conductive ring 73.

[0083] In this embodiment, the sealant structure 72 is an integral structure formed by injecting adhesive. In some embodiments, insulating sheets can also be provided between the conductive rings 73 to insulate them from each other.

[0084] In this embodiment, the spindle body 71 is provided with a wire-passing hole 711 coaxial with its central axis and a strip-shaped eccentric wire-passing groove 712.

[0085] The conductive ring 73 is connected to the outside through the eccentric wire groove 712 and the wire hole 711. In this embodiment, when manufacturing the spindle assembly 7, the wire needs to be passed through the wire hole 711 and the eccentric wire groove 712 and connected to the conductive ring 73 before the glue is filled to form a sealant structure 72, so as to ensure that the conductive ring 73 and the wire can be connected.

[0086] In this embodiment, an oil inlet connector 41 and an oil outlet connector 42 are respectively installed on the housing 1. The oil inlet connector 41 and the oil outlet connector 42 are respectively installed at the end interfaces of the two cooling oil channels 13. By setting the oil inlet connector 41 and the oil outlet connector 42, it is convenient to connect to the external cooling oil pump station.

[0087] In this embodiment, as Figure 7 As shown, it also includes a coupling 81 and a drive motor 82. The spindle body 71 is coaxially and fixedly connected to the output shaft of the drive motor 82 through the coupling 81.

[0088] It also includes a base plate 91 and a U-shaped bracket 92 and an L-shaped mounting bracket 93 disposed on the base plate 91. In this embodiment, the housing 1 is fixedly mounted on the U-shaped bracket 92, and the drive motor 82 is mounted on the L-shaped mounting bracket 93, which can ensure the stability of the high-speed slip ring during rotation. In this embodiment, the U-shaped bracket 92 and the L-shaped mounting bracket 93 can also be replaced with other structures. Technicians can set them themselves as needed, and examples will not be given here.

[0089] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A dual layer fully enclosed cooled high speed conductive slip ring characterized in that, The shell (1) comprises a mounting cavity (14) and two cooling oil flow channels (13), and the mandrel assembly (7) is rotatably arranged in the mounting cavity (14) of the shell (1) through two hybrid bearings (6); The hybrid bearing (6) comprises an outer ring steel body (61), ceramic balls (63) and an inner ring steel body (62) arranged from outside to inside; The shell (1) is provided with a first annular groove (131) and a second annular groove (132) in communication with the cooling oil flow channels (13), and the two hybrid bearings (6) are arranged in the first annular groove (131) and the second annular groove (132) respectively; In the case that the hybrid bearings (6) are arranged in the first annular groove (131) and the second annular groove (132), the two cooling oil flow channels (13) are directly communicated through the first annular groove (131) or / and the second annular groove (132), and the outer ring steel body (61) of the hybrid bearing (6) is heat-conducted through the cooling oil flowing in the first annular groove (131) and the second annular groove (132); The mounting cavity (14) is located between the two cooling oil flow channels (13), and the shell (1) is further provided with at least two communication inclined holes (133) for communicating the mounting cavity (14) and the two cooling oil flow channels (13), the two cooling oil flow channels (13) are indirectly communicated through the communication inclined holes (133), and the mandrel assembly (7) and the inner ring steel body (62) of the hybrid bearing (6) are heat-conducted through the cooling oil filled in the mounting cavity (14) through the communication inclined holes (133); The brush wire assembly (3) and the end cover assembly arranged at both ends of the shell (1) are further arranged on the shell (1), and the mounting cavity (14) in the shell (1) is enclosed into a closed cavity for containing cooling oil through the brush wire assembly (3) and the end cover assembly; The flow channel structure composed of the cooling oil flow channels, the first annular groove, the second annular groove, the communication inclined holes and the mounting cavity is used for omnibearing surrounding cooling and heat dissipation of the mandrel body and the hybrid bearing.

2. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 1, wherein, The end cover assembly comprises a first end cover (21) and a second end cover (22) which are detachably fixed to the end portions of the shell (1), and the second end cover (22) is sleeved on the mandrel assembly (7) and is rotationally connected thereto; The sealing assembly for improving the sealing performance comprises a sealing ring body (51), a first sealing gasket (52) and a second sealing gasket (55); The sealing ring body (51) is sleeved on the mandrel assembly (7) and located in the second end cover (22); The first sealing gasket (52) is arranged between the first end cover (21) and the end portion of the shell (1), and the second sealing gasket (55) is arranged between the second end cover (22) and the end portion of the shell (1).

3. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 2, wherein, The sealing assembly further comprises a third sealing gasket (54) arranged between the brush wire assembly (3) and the shell (1); The shell (1) is provided with a first flange plate (11) and a second flange plate (12) at the two end portions respectively, the first end cover (21) is arranged on the first flange plate (11), and the second end cover (22) is arranged on the second flange plate (12); The first sealing gasket (52) is located between the first flange plate (11) and the first end cover (21); The second sealing gasket (55) is located between the second flange plate (12) and the second end cover (22).

4. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 3, wherein, The first sealing gasket (52), the second sealing gasket (55) and the third sealing gasket (54) are all asbestos paper sealing gaskets.

5. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 2, wherein, The second end cover (22) is provided with a sealing ring mounting groove (221) for mounting the sealing ring body (51); The sealing ring mounting groove (221) is an annular groove; The sealing ring body (51) is an O-shaped sealing ring, and the limiting linear speed of the sealing ring body (51) is greater than 18.3 m / s.

6. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 1, wherein, The brush wire assembly (3) comprises a brush wire mounting plate (31), a filling glue body (32), and a plurality of sleeving tubes (33) and a plurality of brush wire bodies (34). The brush wire body (34) is fixed on the filling glue body (32) through the sleeving tube (33), the filling glue body (32) is clamped and fixed in the brush wire mounting plate (31), and the brush wire mounting plate (31) is detachably fixed on the shell (1). The mounting cavity (14) in the shell (1) forms a closed cavity through the brush wire mounting plate (31), the filling glue body (32) and the end cover assembly. The brush wire body (34) is in elastic contact with the mandrel assembly (7) at the end away from the filling glue body (32).

7. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 6, wherein, The brush wire body (34) is in elastic contact with the mandrel assembly (7) at an inclined position. The brush wire body (34) has an included angle between the vertical line between the fixed end of the brush wire body (34) and the central axis of the mandrel assembly (7) and the axis of the brush wire body (34), and the included angle ranges from 6° to 15°.

8. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 1, wherein, The mandrel assembly (7) comprises a mandrel body (71), a sealing glue structure (72) mounted on the mandrel body (71), and a plurality of electrically conductive rings (73) distributed at equal intervals along the axial direction of the mandrel body (71). The hybrid bearing (6) is mounted on the mandrel body (71), and the electrically conductive ring (73) and the sealing glue structure (72) are located between the two hybrid bearings (6). The plurality of electrically conductive rings (73) are insulated from each other by the sealing glue structure (72). The brush wire assembly (3) is located between the two hybrid bearings (6) and is in elastic contact with the electrically conductive ring (73) at the free end.

9. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 8, wherein, The mandrel body (71) is provided with a wire passing hole (711) coaxial with the central axis thereof and a strip-shaped eccentric wire passing groove (712). The electrically conductive ring (73) is in electrical communication with the outside through the eccentric wire passing groove (712) and the wire passing hole (711).

10. A dual layer fully enclosed cooled high speed conductive slip ring as claimed in claim 1, wherein, The oil inlet joint (41) and the oil outlet joint (42) are respectively mounted on the two cooling oil flow channels (13) at the end interfaces.

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