High-rotating-speed precise conductive slip ring based on thermoelectric refrigeration

Abstract

The utility model discloses a high-rotating-speed precise conductive slip ring based on thermoelectric refrigeration, which is characterized in that a detachable outer cover is arranged on a high-rotating-speed tight slip ring bracket, and a thermoelectric refrigerating unit and radiating fins are arranged between the high-rotating-speed tight slip ring bracket and the outer cover; a shaft is arranged in the high-rotating-speed tight slip ring support, and a friction pair is arranged on the shaft and located in the cooling cavity. The small end of the shaft is in supporting fit with the high-rotating-speed tight slip ring bracket through a small-end bearing; the large end of the shaft is in supporting fit with the high-rotating-speed tight slip ring bracket through a large-end bearing; an end cover of the small-end bearing is fixedly connected with the chuck cover, the chuck cover is detachably connected with the outer cover, and the large-end bearing is fixedly connected with the large-end bearing cover; and a compressed air flow channel is arranged on the chuck cover. The closed cooling cavity is adopted, so that the friction pair has dustproof and waterproof performance, near-end refrigeration temperature control is achieved, peripheral pipeline layout is reduced, and the radial size is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of connectors, and in particular relates to a high-speed precision conductive slip ring based on thermoelectric refrigeration. Background Art

[0002] Conductive slip ring is a precision power transmission device used to achieve power and signal transmission between two relatively rotating mechanisms. It is designed to achieve power transmission and rotation functions. The conductive slip ring supports the rotating part and the stationary part through bearings, enabling it to achieve unlimited n±360° rotation; power and signal transmission depends on the friction pair between the rotating part and the stationary part. As a high-tech product, high-speed precision conductive slip rings have long been widely used in cutting-edge technology fields and are key components of various high-speed turbine test turntables, aviation motor test benches and precision gearboxes.

[0003] High-speed precision conductive slip rings are mainly composed of elastic materials - brushes, sliding contact surface materials - conductive rings, insulating materials, adhesive materials, brackets, precision bearings, dust covers and other slip ring accessories. The slip ring brushes are made of precious metal alloys and are "II" symmetrically in double contact with the conductive ring grooves. The elastic pressure of the brushes and the sliding contact with the conductive ring grooves are used to transmit signals and currents. Since high-speed rotation will bring friction heat to the friction pair, if the temperature is not controlled, the friction pair will have a shortened life or burn out immediately.

[0004] The existing high-speed precision conductive slip rings usually use circulating / natural air cooling or circulating oil cooling technology to control the temperature of the friction pair. The circulating / natural air cooling cooling method uses a high-power fan or compressed gas to blow air to cool the slip ring friction pair. Therefore, its friction pair structure can usually only be designed as an open structure, which does not have dust and water resistance. The use environment requirements are high. Once there is condensed water on the friction pair, it is easy to cause a short circuit between the rings. In addition, the heat exchange capacity and efficiency of circulating / natural air cooling are limited, which is not suitable for high-speed slip ring designs with more than 10,000 revolutions per minute. The circulating oil cooling cooling method uses an industrial chiller to refrigerate the circulating heat transfer oil through a compressor at the remote end, and then delivers it to the high-speed slip ring through a pump. This method requires connecting two heat transfer oil circulation pipelines for inlet and outlet, resulting in a large radial space occupied by the slip ring cooling cabin design, which is difficult to apply to some narrow system installation spaces. In addition, due to the remote refrigeration and temperature control, the circulation pipeline needs to be thoroughly insulated, which is a large workload. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a high-speed precision conductive slip ring based on thermoelectric refrigeration, which adopts a closed cooling cavity to make the friction pair have dust and water resistance. At the same time, it realizes proximal refrigeration temperature control, reduces the peripheral pipeline layout, and reduces the radial size.

[0006] To achieve the above technical purpose, the utility model adopts the following technical scheme: a high-speed precision conductive slip ring based on thermoelectric refrigeration, comprising: a high-speed tight slip ring bracket, a thermoelectric cooler, a heat dissipation fin, a cooling chamber, a compressed air flow channel, an outer cover, a friction pair, a shaft composed of a small shaft and a large shaft sleeved together, a small end bearing, a large end bearing, a chuck cover and a large end bearing cover, the high-speed tight slip ring bracket is provided with a detachable outer cover, the thermoelectric cooler and the heat dissipation fin are arranged between the high-speed tight slip ring bracket and the outer cover; a shaft is arranged in the high-speed tight slip ring bracket, and a friction pair is arranged on the shaft, and the friction pair is located in the cooling chamber; the small end of the shaft is supported and matched with the high-speed tight slip ring bracket through the small end bearing; the large end of the shaft is supported and matched with the high-speed tight slip ring bracket through the large end bearing; the end cover of the small end bearing is fixedly connected to the chuck cover, and the chuck cover is detachably connected to the outer cover, and the large end bearing is fixedly connected to the large end bearing cover; the chuck cover is provided with a compressed air flow channel.

[0007] Furthermore, there are two thermoelectric coolers, which are fixedly connected to a high-speed tight slip ring bracket through a Honeywell phase change thermal conductive sheet PTM7950, and the two thermoelectric coolers are on the same vertical line with the friction pair.

[0008] Furthermore, each thermoelectric cooler is fixedly connected to the heat sink fins via a Honeywell phase change thermal conductive sheet PTM7950.

[0009] Furthermore, a dynamic sealing ring is sleeved on the large shaft of the shaft, and the outer ring of the dynamic sealing ring contacts the inner ring of the high-speed tight slip ring bracket, so that the cooling chamber where the friction pair is located is a closed chamber. The cooling chamber uses heat transfer oil as a medium, and the friction pair is immersed in the heat transfer oil.

[0010] Furthermore, a filling port is provided at the upper end of the cooling chamber, and a drain port is provided at the lower end of the cooling chamber.

[0011] Furthermore, a locking nut is provided on the large shaft of the shaft, and the locking nut is connected to the inner ring of the large-end bearing.

[0012] Furthermore, the compressed air flow channel includes: a compressed air inlet end and two compressed air outlet ends connected to the compressed air inlet end, wherein one compressed air outlet end is at the same height as the heat dissipation fins located on the upper side, and the other compressed air outlet end is at the same height as the heat dissipation fins located on the lower side; the compressed air inlet end is connected to the outlet of the compressed air pump.

[0013] Furthermore, the outer cover is provided with an exhaust hole.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The cooling chamber in the high-speed precision conductive slip ring based on thermoelectric refrigeration of the utility model is a closed chamber, so that the friction pair in the cooling chamber has dust and water resistance. At the same time, it can ensure that the friction pair is placed in a sealed cooling chamber, so that the temperature of the friction pair is close to the room temperature;

[0016] 2. The thermoelectric cooler in the high-speed precision conductive slip ring based on thermoelectric refrigeration of the utility model utilizes the Peltier effect to make the side attached to the high-speed tight slip ring bracket perform cooling and temperature control, so that the cooling part of the thermoelectric cooler is close to the heated friction pair, which can achieve near-end cooling and temperature control, avoiding the use of "long-distance" transmission pipelines to cool the friction pair like oil cooling technology, reducing the layout of peripheral pipelines, and eliminating the need for insulation treatment of the pipelines;

[0017] 3. The compressed air flow channel in the high-speed precision conductive slip ring based on thermoelectric refrigeration of the utility model only needs one compressed air channel to dissipate the heat of the heat sink fins attached to the top of the thermoelectric cooler, without the need for insulation measures, thus reducing the radial size of the high-speed precision conductive slip ring and achieving refrigeration temperature control of the friction pair with a more compact layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the high-speed precision conductive slip ring based on thermoelectric refrigeration of the utility model;

[0019] Among them, 1-high speed tight slip ring bracket, 2-thermoelectric cooler, 3-heat sink fin, 4-cooling chamber, 41-filling port, 42-drain port, 5-compressed air flow channel, 6-outer cover, 7-friction pair, 8-shaft, 9-small end bearing, 10-big end bearing, 11-chuck cover, 12-big end bearing cover, 13-locking nut, 14-dynamic sealing ring, 15-exhaust hole. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further explained below in conjunction with the accompanying drawings.

[0021] like Figure 1The utility model is a cross-sectional view of a high-speed precision conductive slip ring based on thermoelectric refrigeration, which comprises: a high-speed tight slip ring bracket 1, a thermoelectric cooler 2, a heat dissipation fin 3, a cooling chamber 4, a compressed air flow channel 5, an outer cover 6, a friction pair 7, a shaft 8 composed of a small shaft and a large shaft sleeve, a small end bearing 9, a large end bearing 10, a chuck cover 11 and a large end bearing cover 12. A detachable outer cover 6 is provided on the high-speed tight slip ring bracket 1, and an exhaust hole 15 is provided on the outer cover 6, through which the high-speed precision conductive slip ring is cooled; the thermoelectric cooler 2, The heat dissipation fin 3 is arranged between the high-speed tight slip ring bracket 1 and the outer cover 6; the high-speed tight slip ring bracket 1 is provided with a shaft 8, and the shaft 8 is provided with a friction pair 7, and the friction pair 7 is located in the cooling chamber 4; the small end of the shaft 8 is supported and matched with the high-speed tight slip ring bracket 1 through the small end bearing 9, and the large end of the shaft 8 is supported and matched with the high-speed tight slip ring bracket 1 through the large end bearing 10; the end cover of the small end bearing 9 is fixedly connected to the chuck cover 11, and the chuck cover 11 is detachably connected to the outer cover 6, and the large end bearing 10 is fixedly connected to the large end bearing cover 12; the chuck cover 11 is provided with a compressed air flow channel 5. The utility model adopts a closed cooling cavity, so that the friction pair has dustproof and waterproof performance, and at the same time, realizes proximal refrigeration temperature control, reduces the peripheral pipeline layout, and reduces the radial size.

[0022] There are two thermoelectric coolers 2 in the utility model, which are fixedly connected to the high-speed tight slip ring bracket 1 through the Honeywell phase change heat conductive sheet PTM7950, and the two thermoelectric coolers 2 are on the same vertical line with the friction pair 7; each thermoelectric cooler 2 is fixedly connected to the heat dissipation fin 3 through the Honeywell phase change heat conductive sheet PTM7950, and the heat dissipation fin 3 dissipates heat for the heat dissipation surface of the thermoelectric cooler 2, thereby improving the heat dissipation effect. The thermoelectric cooler in the utility model utilizes the Peltier effect to make the side attached to the high-speed tight slip ring bracket perform cooling and temperature control, so that the cooling part of the thermoelectric cooler is close to the heated friction pair, and can achieve proximal cooling and temperature control, avoiding the use of "long-distance" transmission pipelines to cool the friction pair like oil cooling technology, reducing the layout of peripheral pipelines, and not requiring insulation treatment of the pipelines.

[0023] The dynamic seal ring 14 is sleeved on the large shaft of the shaft 8, and the outer ring of the dynamic seal ring 14 contacts the inner ring of the high-speed tight slip ring bracket 1, so that the cooling chamber 4 where the friction pair 7 is located is a closed chamber. The cooling chamber 4 uses heat transfer oil as a medium, immerses the friction pair 7 in the heat transfer oil, and uses the heat transfer oil to efficiently transport the cooling capacity generated by the thermoelectric cooler 2 to the friction pair 7, which belongs to proximal cooling and avoids complex pipeline design. A filling port 41 is provided at the upper end of the cooling chamber 4, and a drain port 42 is provided at the lower end of the cooling chamber 4. After the high-speed precision conductive slip ring has been used for a certain period of time, the heat transfer oil is replaced through the filling port 41 and the drain port 42 of the cooling chamber 4 to ensure the insulation performance of the heat transfer oil, thereby ensuring the stable transmission of the electrical signal; when draining, the two ports need to be opened at the same time to balance the air pressure inside and outside the cooling chamber 4, which is convenient for the test operator to maintain.

[0024] A locking nut 13 is provided on the large shaft of the shaft 8. The locking nut 13 is connected to the inner ring of the large-end bearing 10 to lock the inner ring of the large-end bearing 10 and limit its axial position.

[0025] The compressed air flow channel 5 includes: a compressed air inlet end and two compressed air outlet ends connected to the compressed air inlet end, wherein one compressed air outlet end is at the same height as the heat sink fin 3 located on the upper side, and the other compressed air outlet end is at the same height as the heat sink fin 3 located on the lower side; the compressed air inlet end is connected to the outlet of the compressed air pump. The heat sink fin attached to the top of the thermoelectric cooler is cooled by compressed air and discharged through the exhaust holes on the outer cover 6. Only one compressed air is needed. Compared with the original high-speed precision conductive slip ring that needs to be connected to two circulation pipelines, the radial size of the high-speed precision conductive slip ring can be reduced by more than half compared with the conventional high-speed slip ring configuration.

[0026] The working process of the high-speed precision conductive slip ring based on thermoelectric refrigeration of the utility model is specifically as follows: the stator of the high-speed precision conductive slip ring, i.e., the static part, is connected to the data acquisition system, and the rotor, i.e., the rotating part, is connected to the sensor on the peripheral rotating structure, such as a strain gauge. The micro strain generated by the strain gauge is transmitted to the acquisition system through the friction pair 7 in the cooling chamber 4 in the form of micro voltage. During the rotation, the friction pair 7 in the cooling chamber 4 generates heat. At this time, the thermoelectric cooler 2 is started, and the thermoelectric cooler 2 attached to the side of the high-speed tight slip ring bracket 1 performs cooling and temperature control. The heat conduction oil in the cooling chamber 4 is cooled, and the heat dissipation surface of the thermoelectric cooler 2 is heated. At this time, the heat dissipation fins 3 exchange heat with the compressed air entering from the compressed air flow channel 5. The compressed air accelerates the heat exchange between the heat dissipation fins 3 and the air, and transfers the heat out of the high-speed precision conductive slip ring through the exhaust hole 15 of the outer cover 6. The cold surface of the thermoelectric cooler 2 is continuously cooled and cooled, thereby ensuring that the friction pair 7 is protected from high-temperature friction damage.

[0027] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A high-speed precision conductive slip ring based on thermoelectric refrigeration, characterized in that: include: A high-speed tight slip ring bracket (1), a thermoelectric cooler (2), a heat dissipation fin (3), a cooling chamber (4), a compressed air flow channel (5), an outer cover (6), a friction pair (7), a shaft (8) composed of a small shaft and a large shaft sleeved together, a small-end bearing (9), a large-end bearing (10), a chuck cover (11) and a large-end bearing cover (12); the high-speed tight slip ring bracket (1) is provided with a detachable outer cover (6); the thermoelectric cooler (2) and the heat dissipation fin (3) are arranged between the high-speed tight slip ring bracket (1) and the outer cover (6); the high-speed tight slip ring bracket (1) is provided with a shaft (8) The shaft (8) is provided with a friction pair (7), and the friction pair (7) is located in the cooling chamber (4); the small end of the shaft (8) is supported and matched with a high-speed tight slip ring bracket (1) through a small-end bearing (9); the large end of the shaft (8) is supported and matched with a high-speed tight slip ring bracket (1) through a large-end bearing (10); the end cover of the small-end bearing (9) is fixedly connected to a chuck cover (11), and the chuck cover (11) is detachably connected to an outer cover (6); the large-end bearing (10) is fixedly connected to the large-end bearing cover (12); and a compressed air flow channel (5) is provided on the chuck cover (11).

2. A high-speed precision conductive slip ring based on thermoelectric refrigeration according to claim 1, characterized in that: There are two thermoelectric coolers (2), which are fixedly connected to a high-speed tight slip ring bracket (1) via a Honeywell phase change heat conductive sheet PTM7950, and the two thermoelectric coolers (2) and the friction pair (7) are located on the same vertical line.

3. The high-speed precision conductive slip ring based on thermoelectric refrigeration according to claim 2, characterized in that: Each thermoelectric cooler (2) is fixedly connected to the heat dissipation fin (3) via a Honeywell phase change thermal conductive sheet PTM7950.

4. The high-speed precision conductive slip ring based on thermoelectric cooling according to claim 1, characterized in that: A dynamic seal ring (14) is sleeved on the large shaft of the shaft (8), and the outer ring of the dynamic seal ring (14) contacts the inner ring of the high-speed tight slip ring bracket (1), so that the cooling chamber (4) where the friction pair (7) is located is a closed chamber. The cooling chamber (4) uses heat transfer oil as a medium, and the friction pair (7) is immersed in the heat transfer oil.

5. The high-speed precision conductive slip ring based on thermoelectric cooling according to claim 4, characterized in that: The upper end of the cooling chamber (4) is provided with a filling port (41), and the lower end of the cooling chamber (4) is provided with a liquid discharge port (42).

6. The high-speed precision conductive slip ring based on thermoelectric cooling according to claim 1, characterized in that: A locking nut (13) is provided on the large shaft of the shaft (8), and the locking nut (13) is connected to the inner ring of the large end bearing (10).

7. The high-speed precision conductive slip ring based on thermoelectric cooling according to claim 1, characterized in that: The compressed air flow channel (5) comprises: a compressed air inlet end and two compressed air outlet ends connected to the compressed air inlet end, wherein one compressed air outlet end is at the same height as the heat dissipation fin (3) located on the upper side, and the other compressed air outlet end is at the same height as the heat dissipation fin (3) located on the lower side; the compressed air inlet end is connected to the outlet of a compressed air pump.

8. The high-speed precision conductive slip ring based on thermoelectric cooling according to claim 1, characterized in that: The outer cover (6) is provided with an exhaust hole (15).

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