A liquid metal electrically conductive slip ring supported by an air bearing

Abstract

The application relates to a liquid metal conductive slip ring supported by air floating bearings and relates to the technical field of temperature detection of high-speed rotating parts. The application solves the problem that the existing contact type temperature measurement method such as thermocouple and thermal resistance cannot measure the temperature of the rotating ring of the bearing. The rotating shaft is coaxially arranged in the inner hole of the inner cylinder, the two ends of the rotating shaft are rotatably and sealingly connected with the inner cylinder through the spherical gas bearing and the cylindrical gas bearing, the combined sealing structure is arranged between the spherical gas bearing and the cylindrical gas bearing, the combined sealing structure is sleeved on the middle part of the rotating shaft, the front end cover and the rear end cover are respectively arranged on the two sides of the inner cylinder, the multiple sealing units in the combined sealing structure are arranged in series from front to back along the front direction of the rotating shaft, and one air sealing ring is arranged between every two adjacent sealing units. The application is used for realizing the transmission of electric signals from the high-speed rotor to the stator and improving the accuracy of the bearing rotating ring temperature measurement.

Description

TECHNICAL FIELD

[0001] The application relates to a liquid metal conductive slip ring supported by air floating bearings. BACKGROUND

[0002] The temperature change of the inner ring of the bearing can effectively reflect the working state of the bearing to a certain extent, and is one of reliable ways for bearing state detection. For the temperature measurement of the rolling bearing, according to the type of the sensor used, the measurement method can be divided into contact type bearing temperature measurement and non-contact type bearing temperature measurement. The non-contact type bearing temperature measurement is realized by using an infrared temperature measurement sensor, and the method is greatly affected by the infrared emissivity of the measured material and the environment. The contact type bearing temperature measurement is directly measured by contacting the temperature sensor measurement part, and good data results can be obtained. However, for the temperature measurement of the rotating ring or the part on the rotating shaft of the bearing, when the rotating speed is high, how to stably transmit the measurement signal from the high-speed rotating equipment to the data receiver is a problem that needs to be solved for the current high-speed rotating part temperature test.

[0003] As described above, in the existing contact type temperature measurement method such as thermocouple and thermal resistance, the problem that the temperature of the rotating ring of the bearing cannot be measured exists. SUMMARY

[0004] The application aims to solve the problem that the temperature of the rotating ring of the bearing cannot be measured in the existing contact type temperature measurement method such as thermocouple and thermal resistance, and further provides a liquid metal conductive slip ring supported by air floating bearings.

[0005] The technical scheme of the application is as follows:

[0006] A liquid metal conductive slip ring supported by air floating bearings, which comprises an inner cylinder 2, a rotating shaft 3, a front end cover 4, a spherical gas bearing 5, a cylindrical gas bearing 6, a rear end cover 7 and a combined sealing structure.

[0007] The rotating shaft 3 is coaxially inserted into the inner hole of the inner cylinder 2, the two ends of the rotating shaft 3 are rotatably and sealingly connected with the inner cylinder 2 through the spherical gas bearing 5 and the cylindrical gas bearing 6 respectively, the combined sealing structure is arranged between the spherical gas bearing 5 and the cylindrical gas bearing 6, the combined sealing structure is sleeved on the middle part of the rotating shaft 3, the front end cover 4 and the rear end cover 7 are respectively arranged on the two sides of the inner cylinder 2, the combined sealing structure comprises a plurality of air sealing rings 14 and a plurality of sealing units, the plurality of sealing units are arranged in series from front to back along the front direction of the rotating shaft 3, and one air sealing ring 14 is arranged between each adjacent two sealing units.

[0008] The end surface of the inner cylinder 2 is axially machined with a gas inlet main passage, and a plurality of gas inlet branches are radially machined inside the inner cylinder 2, both ends of each gas inlet branch are communicated with the gas inlet main passage and the inner hole of the inner cylinder 2, the plurality of gas inlet branches are respectively corresponding to the spherical gas bearing 5, the cylindrical gas bearing 6 and the gas channel of the plurality of gas seal rings 14, the end surface of the inner cylinder 2 is axially machined with a gas exhaust main passage, and a plurality of gas exhaust branches are radially machined inside the inner cylinder 2, both ends of each gas exhaust branch are communicated with the gas exhaust main passage and the inner hole of the inner cylinder 2, the plurality of gas exhaust branches are respectively communicated with the gaps on both sides of the plurality of sealing units, the rear end cover 7 is respectively machined with a gas inlet and a gas outlet corresponding to the gas inlet main passage and the gas exhaust main passage, and the gas inlet and the gas outlet are respectively installed with a gas inlet nozzle 19 and a gas outlet nozzle 20;

[0009] Each sealing unit is provided with a liquid conductive metal cavity inside, the rotating shaft 3 is a hollow rotating shaft, the center hole of the rotating shaft 3 is a liquid inlet main passage, a plurality of inclined holes are sequentially machined on the side surface of the rotating shaft 3 from front to back along the length direction, the side surface inclined hole of the rotating shaft 3 is a liquid metal inlet hole, both ends of each liquid metal inlet hole are communicated with the liquid inlet main passage and the liquid conductive metal cavity of the corresponding sealing unit, the end surface of the inner cylinder 2 is axially machined with a signal output main passage, a plurality of signal output branches are radially machined inside the inner cylinder 2, both ends of each signal output branch are communicated with the liquid exhaust main passage and the liquid conductive metal cavity of the corresponding sealing unit, the rear end cover 7 is machined with a signal output port 21 corresponding to the signal output main passage, a nylon plug is inserted in each signal output branch hole of the inner cylinder 2, a center through hole is machined on the nylon plug, a metal terminal post is inserted in the center through hole of the plug and immersed in the liquid conductive metal, the other end of the metal terminal post is connected with a signal transmission wire, and the signal transmission wire is output through the signal output port 21 by the signal output main passage.

[0010] Further, each sealing unit includes a positioning ring 16 and two lip-shaped sealing rings 15, the two lip-shaped sealing rings 15 are respectively arranged on both sides of the positioning ring 16, and the small cavities of each lip-shaped sealing ring 15 are all directed to the positioning ring 16. The inner hole of the positioning ring 16 in each sealing unit and the small cavities of the two lip-shaped sealing rings 15 form a liquid conductive metal cavity.

[0011] Further, a plurality of positioning ring lead holes are radially machined on the cylindrical surface of the positioning ring 16, the plurality of positioning ring lead holes are respectively corresponding to the signal output branches, the signal output branches of the inner cylinder 2 are radial stepped holes, the plurality of radial stepped holes are concentrically arranged with the plurality of positioning ring lead holes, a plurality of inner cylinder threaded holes concentrically arranged with the radial stepped holes are machined on the cylindrical surface of the inner cylinder 2, the nylon plug is inserted in the radial stepped hole, and the bolt is screwed into the inner cylinder threaded hole above the nylon plug to press the nylon plug on the positioning ring 16.

[0012] Further, the rotating shaft 3 is made of insulating material or metal material with surface insulation treatment.

[0013] Further, the inner cylindrical surface of the gas seal ring 14 is processed with an inner annular air guide groove in the circumferential direction, the outer cylindrical surface of the gas seal ring 14 is processed with an outer annular air guide groove in the circumferential direction, and the gas seal ring 14 is internally processed with a radial air guide channel, both ends of which are communicated with the inner annular air guide groove and the outer annular air guide groove, respectively.

[0014] Further, the spherical gas bearing 5 comprises a front spherical bearing body 13 and a rear spherical bearing body 12, which are arranged side by side on the rotating shaft 3.

[0015] Further, the front spherical bearing body 13, the rear spherical bearing body 12 and the outer cylindrical surface of the cylindrical gas bearing 6 are respectively processed with an annular air guide groove one, an annular air guide groove two and an annular air guide groove three in the circumferential direction.

[0016] Further, the front end cover 4 and the rear end cover 7 are both processed with a circular ring-shaped protrusion on the side end surface close to the inner cylinder 2, the circular ring-shaped protrusion end surface of the front end cover 4 is in contact with the end surface of the spherical gas bearing 5, and the circular ring-shaped protrusion end surface of the rear end cover 7 is in contact with the end surface of the cylindrical gas bearing 6.

[0017] Further, the front end cover 4 and the rear end cover 7 are both processed with a circular ring-shaped protrusion on the side end surface close to the inner cylinder 2, the circular ring-shaped protrusion end surface of the front end cover 4 is in contact with the end surface of the spherical gas bearing 5, and the circular ring-shaped protrusion end surface of the rear end cover 7 is in contact with the end surface of the cylindrical gas bearing 6.

[0018] Further, it further comprises a supporting cooling outer cylinder 1, the supporting cooling outer cylinder 1 is coaxially sleeved on the outside of the inner cylinder 2, the cylindrical surface of the inner cylinder 2 is processed with an annular groove, the two ends of the supporting cooling outer cylinder 1 are respectively sealed and matched with the inner cylinder 2 through sealing rings, the outer wall of the supporting cooling outer cylinder 1 is processed with a water inlet 17 on the upper part, and the outer wall of the supporting cooling outer cylinder 1 is processed with a water outlet 18 on the side part.

[0019] Compared with the prior art, the present application has the following effects:

[0020] 1. Without changing the working principle of the liquid metal conductive slip ring, the present application changes the shaft support structure, i.e. uses the combination of spherical static pressure gas bearing and cylindrical gas bearing, to meet the demand for high speed and long service life; the static sealing of the metal liquid is realized through the framework sealing, and the dynamic sealing of the liquid metal is realized through the combination of the framework sealing and the gas sealing, which reduces the wear of the sealing structure and the rotating shaft and improves the working performance of the conductive slip ring shaft system under the condition of ensuring good sealing of the liquid metal.

[0021] 2、The liquid metal conductive slip ring supported by the gas bearing of the application can well meet the requirements of the signal transmission device of the high-speed rotating part temperature detection system, and has a very good development and application prospect, since the cost is significantly lower than that of the wireless transmission device, and the adaptability to the environment is also very good. The application improves the traditional contact temperature measurement method, realizes the conduction of the rotor and the stator by using the liquid conductive metal, and can meet the temperature monitoring of the high-speed rotating part through the support and sealing design.

[0022] 3、The application proposes a liquid metal contact conductive slip ring supported by the gas bearing suitable for high-speed working conditions, in order to serve the temperature detection of the bearing service state, solve the problem that the thermal couple, thermal resistance and other contact temperature measurement methods cannot measure the temperature of the bearing rotating ring, realize the stable signal transmission between the high-speed rotating shafts, and improve the accuracy of the bearing rotating ring temperature measurement. The application can also be used for the transmission of test signals such as strain and vibration of the parts on the rotating shaft.

[0023] 4、The high-speed vibration of the rotating shaft and the frictional heat of the sealing ring and the bearing are not conducive to the long-term use of the sealing ring. Improving the sealing structure of the conductive slip ring and improving its working environment is an effective way to improve the performance of the conductive slip ring. The application redesigns the overall structure of the conductive slip ring from improving the shafting structure and the sealing system, configures a cooling device on the outer ring of the conductive slip ring, introduces a gas bearing and a gas sealing structure, and plans the layout of the conductive slip ring line and the gas line. The service life of the sealing ring is improved, and the performance of the conductive slip ring is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the axonometric view of the liquid metal conductive slip ring supported by the gas bearing of the application;

[0025] Figure 2 is the front view of the liquid metal conductive slip ring supported by the gas bearing of the application;

[0026] Figure 3 is Figure 2 the cross-sectional view at A-A;

[0027] Figure 4 is Figure 2 the cross-sectional view at B-B;

[0028] Figure 5 is the overall structure schematic view of the liquid metal conductive slip ring supported by the gas bearing of the application;

[0029] Figure 6 is the shafting structure schematic view of the liquid metal conductive slip ring supported by the gas bearing of the application;

[0030] Figure 7 is the internal structure diagram of the rotating shaft 3 and the combined sealing structure of the application;

[0031] Figure 8 is the signal transmission process diagram of the liquid metal conductive slip ring supported by the gas bearing of the application;

[0032] Figure 9 is the gas transmission process diagram of the liquid metal conductive slip ring supported by the gas bearing of the application;

[0033] Figure 10 is the connection diagram of the liquid metal conductive slip ring supported by the gas bearing of the application.

[0034] In the figure: 1- support cooling outer cylinder; 2- inner cylinder; 3- rotating shaft; 4- front end cover; 5- spherical gas bearing; 6- cylindrical gas bearing; 7- rear end cover; 8- first sealing unit; 9- second sealing unit; 10- third sealing unit; 11- fourth sealing unit; 12- rear spherical bearing body; 13- front spherical bearing body; 14- gas sealing ring; 15- lip seal ring; 16- positioning ring; 17- water inlet; 18- drain outlet; 19- air inlet; 20- air outlet; 21- signal output port; 22- high-speed shaft; 23- bellows coupling; 24- jackscrew; 25- female head; 26- male head; 27- input lead; 28- positioning ring; 29- output lead; 30- pin. DETAILED DESCRIPTION

[0035] Specific implementation one: combined Figures 1 to 10 In this embodiment, the gas bearing supported liquid metal conductive slip ring of this embodiment includes an inner cylinder 2, a rotating shaft 3, a front end cover 4, a spherical gas bearing 5, a cylindrical gas bearing 6, a rear end cover 7 and a combined sealing structure;

[0036] The rotating shaft 3 is coaxially inserted into the inner hole of the inner cylinder 2, and the two ends of the rotating shaft 3 are rotatably and sealingly connected with the inner cylinder 2 through the spherical gas bearing 5 and the cylindrical gas bearing 6, respectively. The combined sealing structure is provided between the spherical gas bearing 5 and the cylindrical gas bearing 6, the combined sealing structure is sleeved on the middle part of the rotating shaft 3, the front end cover 4 and the rear end cover 7 are respectively installed on the two sides of the inner cylinder 2, the combined sealing structure includes a plurality of gas sealing rings 14 and a plurality of sealing units, the plurality of sealing units are arranged in series from front to back along the front direction of the rotating shaft 3, and one gas sealing ring 14 is arranged between each adjacent two sealing units;

[0037] The end surface of the inner cylinder 2 is axially machined with a gas inlet main passage, and a plurality of gas inlet branches are radially machined inside the inner cylinder 2, both ends of each gas inlet branch being in communication with the gas inlet main passage and the inner hole of the inner cylinder 2, the plurality of gas inlet branches being one-to-one corresponding to the spherical gas bearing 5, the cylindrical gas bearing 6 and the gas passages of the plurality of gas seal rings 14, the end surface of the inner cylinder 2 is axially machined with a gas exhaust main passage, and a plurality of gas exhaust branches are radially machined inside the inner cylinder 2, both ends of each gas exhaust branch being in communication with the gas exhaust main passage and the inner hole of the inner cylinder 2, the plurality of gas exhaust branches being in communication with the gaps on both sides of the plurality of sealing units, the rear end cover 7 is machined with a gas inlet and a gas outlet corresponding to the gas inlet main passage and the gas exhaust main passage respectively, and the gas inlet and the gas outlet are respectively provided with a gas inlet nozzle 19 and a gas outlet nozzle 20.

[0038] Each sealing unit is provided with a liquid conductive metal cavity inside, the rotating shaft 3 is a hollow rotating shaft, the center hole of the rotating shaft 3 is a liquid inlet main passage, a plurality of inclined holes are sequentially machined on the side surface of the rotating shaft 3 from front to back along the length direction, the inclined hole of the side surface of the rotating shaft 3 is a liquid metal inlet hole, both ends of each liquid metal inlet hole are in communication with the liquid inlet main passage and the liquid conductive metal cavity of the corresponding sealing unit, the end surface of the inner cylinder 2 is axially machined with a signal output main passage, a plurality of signal output branches are radially machined inside the inner cylinder 2, both ends of each signal output branch are in communication with the liquid exhaust main passage and the liquid conductive metal cavity of the corresponding sealing unit, the rear end cover 7 is machined with a signal output port 21 corresponding to the signal output main passage, a nylon plug is inserted into each signal output branch hole of the inner cylinder 2, a center through hole is machined on the nylon plug, a metal terminal is inserted into the center through hole of the plug and immersed in the liquid conductive metal, the other end of the metal terminal is connected with a signal transmission wire, and the signal transmission wire is output through the signal output port 21 by the signal output main passage. The liquid conductive metal in the embodiment can be gallium-indium-tin alloy.

[0039] In the embodiment, the combined sealing structure includes four sealing units, which are sequentially the first sealing unit 8, the second sealing unit 9, the third sealing unit 10 and the fourth sealing unit 11 from front to back. The sealing mode of the combined sealing structure of the application selects the series structure of skeleton sealing and gas sealing to realize the sealing of the liquid metal.

[0040] In the embodiment, one hollow rotating shaft 3 is supported by one cylindrical gas bearing 6 and one spherical gas bearing 5 at both ends respectively. The spherical gas film seal can not only position the rotating shaft 3 through the radial force on the ball center, but also provide a certain adjustment space for the rotating shaft 3 when the gas film pressure changes.

[0041] In this embodiment, the support cooling outer cylinder 1, inner cylinder 2, front end cover 4 and rear end cover 7 form an insulating shell. The insulating shell, rotating shaft 3 and two lip-shaped sealing rings 15 in each sealing unit form a sealed liquid conductive metal cavity. The liquid conductive metal cavity is filled with liquid conductive metal. The insulating shell is fixed to form a stator, and the insulating shell is provided with a terminal post to which a signal transmission wire is connected; the rotating shaft 3 is provided with a fine hole (i.e. a liquid metal inlet hole) to introduce the liquid metal in the rotating shaft 3 into the metal terminal post on the insulating shell through the fine hole to realize circuit conduction.

[0042] In this embodiment, the gas path section and the line section are at a certain angle in the circumferential direction of the slip ring to avoid interference of the structure.

[0043] Specific implementation method two: combined Figure 3 and Figure 4 In this embodiment, each sealing unit of the embodiment includes a positioning ring 16 and two lip-shaped sealing rings 15, the two lip-shaped sealing rings 15 are arranged opposite to each other on both sides of the positioning ring 16, the small cavities of each lip-shaped sealing ring 15 face the positioning ring 16, and a liquid conductive metal cavity is formed between the inner hole of the positioning ring 16 and the small cavities of the two lip-shaped sealing rings 15 in each sealing unit. In this way, the conductive slip ring is sealed by a combination of gas sealing and sealing ring contact sealing, the lip-shaped sealing ring 15 mainly plays a main sealing role when the slip ring is stationary or the gas sealing is not working, so as to avoid leakage of the metal liquid, and at the same time plays an auxiliary sealing role when the slip ring is working. After the gas enters the gas sealing ring 14, a local high pressure is formed inside the gas cavity, the gas enters the lip-shaped sealing ring 15 after passing through the throttling action between the inner ring of the gas sealing ring 14 and the cylindrical surface of the rotating shaft 3, the gas pressure on the outside of the lip-shaped sealing ring 15 is increased, a part of the gas enters the main lip and the auxiliary lip cavities of the lip-shaped sealing ring 15, which can form gas dynamic pressure lubrication under the driving of the high-speed shaft 3, reduce the contact area between the lip-shaped sealing ring 15 and the high-speed shaft 3, reduce the wear of the sealing lip, prolong the service life of the lip-shaped sealing ring 15, and form a plurality of gas films by means of gas dynamic pressure effect to seal the liquid metal inside the two lip-shaped sealing rings 15. The other components and connection relationship are the same as those in the specific implementation method one.

[0044] In this embodiment, the material of the positioning ring 16 is selected to be an insulating material with high rigidity to ensure the axial positioning accuracy, and materials such as ceramic and PA66GF30 can be selected.

[0045] Specific implementation method three: combined Figure 3 and Figure 4In this embodiment, the positioning ring 16 is provided with a plurality of positioning ring lead holes machined along the radial direction of the cylindrical surface of the positioning ring 16, and the plurality of positioning ring lead holes are in one-to-one correspondence with the signal output branches. The signal output branches of the inner cylinder 2 are radial stepped holes, and the plurality of radial stepped holes are concentrically arranged with the plurality of positioning ring lead holes. The inner cylinder 2 is provided with a plurality of inner cylinder threaded holes concentrically arranged with the radial stepped holes. The nylon plug is inserted into the radial stepped hole, and the bolt is screwed into the inner cylinder threaded hole above the nylon plug to press the nylon plug against the positioning ring 16. In this way, the through hole in the middle of the nylon plug passes through the metal terminal and immerses in the liquid conductive metal, and the upper connecting wire is led out of the through hole of the inner cylinder 2. For easy assembly, the radial stepped hole is concentrically arranged with the positioning ring lead hole on the waterway of the supporting cooling system. The nylon plug is positioned through the stepped hole, and the bolt is screwed into the hole above the plug to press the plug tightly to avoid leakage. The hole at the head of the bolt is welded to isolate the waterway. The other components and connection relationships are the same as those in the first or second embodiment.

[0046] Specific embodiment four: combination Figure 3 and Figure 4 In this embodiment, the rotating shaft 3 is made of insulating material or metal material with surface insulation treatment. In this way, in order to meet the electrical insulation requirements, the rotating shaft 3 can be made of insulating material as a whole, or the metal material can be machined into a shaft, and then the surface of the shaft is insulated to avoid signal disorder caused by the electric charge on the shaft. The other components and connection relationships are the same as those in the first, second or third embodiment.

[0047] In this embodiment, the rotating shaft 3 can be made of ceramic material, or 45 steel or 40Gr is used to machine the shaft, and then an insulating film such as PVD coating film is plated on the surface of the shaft.

[0048] Specific embodiment five: combination Figure 3 and Figure 4 In this embodiment, the inner cylindrical surface of the gas seal ring 14 is provided with an inner annular air guide groove in the circumferential direction, the outer cylindrical surface of the gas seal ring 14 is provided with an outer annular air guide groove in the circumferential direction, and the gas seal ring 14 is provided with a radial air guide channel inside. The two ends of the radial air guide channel are respectively communicated with the inner annular air guide groove and the outer annular air guide groove. The other components and connection relationships are the same as those in the first, second, third or fourth embodiment.

[0049] Specific embodiment six: combination Figures 3 to 6This embodiment describes a spherical gas bearing 5 comprising a front spherical bearing body 13 and a rear spherical bearing body 12, which are mounted side-by-side on a rotating shaft 3. This arrangement facilitates assembly and machining. The spherical gas bearing 5 consists of two parts: the front spherical bearing body 13 and the rear spherical bearing body 12. The spherical gas film seal can both position the rotating shaft through radial force on the center of the sphere and provide a certain adjustment range for the rotating shaft when the gas film pressure changes. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0050] Specific implementation method seven: Combining Figure 3 and Figure 4 In this embodiment, the front spherical bearing body 13, the rear spherical bearing body 12, and the outer cylindrical surface of the cylindrical gas bearing 6 are respectively machined with annular air guide groove 1, annular air guide groove 2, and annular air guide groove 3 along the circumferential direction. This arrangement avoids rotational imbalance caused by additional assembly or secondary machining of the rotating shaft 3. The support structure of the conductive slip ring is designed as a combination of a spherical gas bearing 5 and a cylindrical gas bearing 6, forming a sealed structure. Other components and connections are the same as in specific embodiments one, two, three, four, five, or six.

[0051] Specific implementation method eight: Combination Figure 3 and Figure 4 In this embodiment, both the front cover 4 and the rear cover 7 have annular protrusions on their end faces near the inner cylinder 2, which match the inner hole of the inner cylinder 2. The annular protrusion end face of the front cover 4 contacts the end face of the spherical gas bearing 5, and the annular protrusion end face of the rear cover 7 contacts the end face of the cylindrical gas bearing 6. With this configuration, the front cover 4, the rear cover 7, and the inner cylinder 2 need to be designed separately, and they are axially positioned with the spherical gas bearing 5 and the cylindrical gas bearing 6 through perforated sleeves. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0052] Specific Implementation Method Nine: Combining Figure 1 and Figure 2 In this embodiment, both the front cover 4 and the rear cover 7 have multiple end cover connection holes uniformly machined along the circumferential direction on their end faces. The inner cylinder 2 has end cover connection threaded holes at both ends that correspond one-to-one with the end cover connection holes. The front cover 4 and the rear cover 7 are fixedly connected to both ends of the inner cylinder 2 by multiple end cover connection bolts. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, seven, or eight.

[0053] Specific Implementation Method Ten: Combining Figures 1 to 5The embodiment is described, and the embodiment further comprises a supporting cooling outer cylinder 1, the supporting cooling outer cylinder 1 is coaxially sleeved outside the inner cylinder 2, the inner cylinder 2 is processed with an annular groove, the two ends of the supporting cooling outer cylinder 1 are respectively sealed and matched with the inner cylinder 2 through sealing rings, the upper part of the outer wall of the supporting cooling outer cylinder 1 is processed with a water inlet 17, and the side part of the outer wall of the supporting cooling outer cylinder 1 is processed with a water outlet 18. In this way, the cooling liquid is injected into the cooling cavity formed between the supporting cooling outer cylinder 1 and the inner cylinder 2 through the water inlet 17, and the cooling of the whole device is realized. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth specific embodiments.

[0054] In addition, referring to Figure 10 , a conductive slip ring connection scheme is shown. The electrical signal is input to the rotating shaft 3 of the application by the wire plug from the high-speed shaft 22, the high-speed shaft 22 is connected with the rotating shaft 3 through the bellows coupling 23, the torque is locked and transmitted by the top wire 24, and the signal is transmitted through the inside of the bellows coupling 23. The female head 25 of the wire plug is made of nylon material, four sockets are arranged in the middle for connecting with the male head 26 of the wire plug, and the other side is welded with the input wire 27 to accept the signal of the high-speed shaft 22, and the outer ring is provided with a positioning ring 28 composed of two semicircular positioning sheets to cooperate with the bellows coupling 23. The male head 26 of the wire plug is made of flexible material, which is inserted into the end of the rotating shaft 3 and matched with the shaft hole, four pins 30 are arranged in the corresponding position of the socket of the female head 25 of the wire plug in the middle, and the other end of the pin 30 is welded with the output wire 29 to transmit the signal into the conductive slip ring. Because the male head 26 and the female head 25 of the wire plug are made of elastic material, when the shaft rotates at high speed, the torque is mainly transmitted by the bellows coupling 23, and the wire plug part will not bear too much torque.

[0055] Working principle

[0056] In combination Figures 1 to 10 The working principle of the liquid metal conductive slip ring supported by the gas float bearing is described.

[0057] When the device is used, it is connected with the high-speed shaft through the coupling. When the high-speed shaft rotates, the rotating shaft 3 in the conductive slip ring rotates synchronously, the electrical signal enters the liquid conductive metal cavity of the first sealing unit 8, the second sealing unit 9, the third sealing unit 10 and the fourth sealing unit 11 from the center hole and the side inclined hole of the rotating shaft 3, is led out through the liquid alloy and the metal wire column above the conductive slip ring unit, and is output from the signal output port 2 of the rear end cover 7 at the end of the conductive slip ring through the signal output main channel of the inner cylinder 2. High-pressure air enters from the air inlet nozzle 19, enters the spherical gas bearing 5, the cylindrical gas bearing 6 and the gas seal ring 14 along the air inlet main channel of the inner cylinder 2, is transported to the end of the conductive slip ring along the exhaust main channel on the other side of the inner cylinder 2, and is finally discharged from the exhaust nozzle 20 of the rear end cover 7.

[0058] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those ordinarily skilled in the art should understand: the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid metal electrically conductive slip ring supported by an air bearing, characterized by: It includes inner cylinder (2), rotating shaft (3), front end cover (4), spherical gas bearing (5), cylindrical gas bearing (6), rear end cover (7) and combined sealing structure; Rotating shaft (3) is coaxially inserted in the inner hole of inner cylinder (2), the two ends of rotating shaft (3) are rotatably connected with inner cylinder (2) through spherical gas bearing (5) and cylindrical gas bearing (6), combined sealing structure is arranged between spherical gas bearing (5) and cylindrical gas bearing (6), combined sealing structure is arranged in the middle part of rotating shaft (3), front end cover (4) and rear end cover (7) are respectively arranged on the two sides of inner cylinder (2), combined sealing structure includes multiple gas sealing rings (14) and multiple sealing units, multiple sealing units are arranged in series from front to back along the front direction of rotating shaft (3), one gas sealing ring (14) is arranged between every two adjacent sealing units; The end surface of inner cylinder (2) is axially machined with a gas inlet main channel, a plurality of gas inlet branches are radially machined in the inner part of inner cylinder (2), the two ends of each gas inlet branch are respectively communicated with the gas inlet main channel and the inner hole of inner cylinder (2), the plurality of gas inlet branches are respectively corresponding to the gas channel of spherical gas bearing (5), cylindrical gas bearing (6) and multiple gas sealing rings (14), the end surface of inner cylinder (2) is axially machined with a gas exhaust main channel, a plurality of gas exhaust branches are radially machined in the inner part of inner cylinder (2), the two ends of each gas exhaust branch are respectively communicated with the gas exhaust main channel and the inner hole of inner cylinder (2), the plurality of gas exhaust branches are respectively communicated with the clearance on the two sides of multiple sealing units, the gas inlet and the gas exhaust corresponding to the gas inlet main channel and the gas exhaust main channel are respectively machined on the rear end cover (7), the gas inlet and the gas exhaust are respectively provided with gas inlet nozzle (19) and gas exhaust nozzle (20); Each sealing unit is provided with a liquid conductive metal cavity, rotating shaft (3) is a hollow rotating shaft, the central hole of rotating shaft (3) is a liquid inlet main channel, a plurality of inclined holes are sequentially machined on the side surface of rotating shaft (3) from front to back along the length direction, the inclined hole of rotating shaft (3) is a liquid metal inlet hole, the two ends of each liquid metal inlet hole are respectively communicated with the liquid inlet main channel and the liquid conductive metal cavity of the corresponding sealing unit, the end surface of inner cylinder (2) is axially machined with a signal output main channel, a plurality of signal output branches are radially machined in the inner part of inner cylinder (2), the two ends of each signal output branch are respectively communicated with the liquid exhaust main channel and the liquid conductive metal cavity of the corresponding sealing unit, the signal output port (21) corresponding to the signal output main channel is machined on the rear end cover (7), a nylon plug is inserted in each signal output branch hole of inner cylinder (2), a plug center through hole is machined on the nylon plug, a metal terminal post is inserted in the plug center through hole and immersed in the liquid conductive metal, the other end of the metal terminal post is connected with a signal transmission lead, the signal transmission lead is output through the signal output port (21) through the signal output main channel.

2. A liquid metal electrically conductive slip ring supported by gas floatation bearings as claimed in claim 1, wherein: Each sealing unit comprises a positioning ring (16) and two lip-shaped sealing rings (15) arranged opposite to each other on both sides of the positioning ring (16), and the small cavities of each lip-shaped sealing ring (15) face the positioning ring (16), and a liquid conductive metal cavity is formed between the inner hole of the positioning ring (16) and the small cavities of the two lip-shaped sealing rings (15) in each sealing unit.

3. A liquid metal electrically conductive slip ring supported by gas floatation bearings as claimed in claim 2, wherein: A plurality of positioning ring lead holes are radially machined on the cylindrical surface of the positioning ring (16), and the plurality of positioning ring lead holes correspond to the signal output branches one by one, the signal output branches of the inner cylinder (2) are radial stepped holes, the plurality of radial stepped holes are concentrically arranged with the plurality of positioning ring lead holes, a plurality of inner cylinder threaded holes concentrically arranged with the radial stepped holes are machined on the cylindrical surface of the inner cylinder (2), a nylon plug is inserted into the radial stepped hole, and a bolt is screwed into the inner cylinder threaded hole above the nylon plug to press the nylon plug against the positioning ring (16).

4. A liquid metal electrically conductive slip ring supported by gas floatation bearings according to claim 1 or 3, characterized in that: The rotating shaft (3) is made of insulating material or metal material with a surface insulating treatment.

5. A liquid metal electrically conductive slip ring supported by gas floatation bearings as claimed in claim 4, wherein: An inner annular gas guide groove is machined on the inner cylindrical surface of the gas sealing ring (14) in the circumferential direction, an outer annular gas guide groove is machined on the outer cylindrical surface of the gas sealing ring (14) in the circumferential direction, and a radial gas guide passage is machined inside the gas sealing ring (14), and the two ends of the radial gas guide passage respectively communicate with the inner annular gas guide groove and the outer annular gas guide groove.

6. A liquid metal electrically conductive slip ring supported by gas floatation bearings according to claim 5, wherein: The spherical gas bearing (5) comprises a front spherical bearing body (13) and a rear spherical bearing body (12), and the front spherical bearing body (13) and the rear spherical bearing body (12) are arranged side by side on the rotating shaft (3).

7. A liquid metal electrically conductive slip ring supported by gas floatation bearings according to claim 6, wherein: An annular gas guide groove one, an annular gas guide groove two and an annular gas guide groove three are respectively machined on the outer cylindrical surface of the front spherical bearing body (13), the rear spherical bearing body (12) and the cylindrical gas bearing (6) in the circumferential direction.

8. A liquid metal electrically conductive slip ring supported by gas floatation bearings according to claim 7, wherein: The side end face of the front end cover (4) and the side end face of the rear end cover (7) close to the inner cylinder (2) are respectively machined with a circular ring-shaped protrusion matched with the inner hole of the inner cylinder (2), the circular ring-shaped protrusion end face of the front end cover (4) is in contact with the end face of the spherical gas bearing (5), and the circular ring-shaped protrusion end face of the rear end cover (7) is in contact with the end face of the cylindrical gas bearing (6).

9. A liquid metal electrically conductive slip ring supported by gas floatation bearings according to claim 8, wherein: A plurality of end cover connecting light holes are uniformly machined on the end faces of the front end cover (4) and the rear end cover (7) in the circumferential direction, and a plurality of end cover connecting threaded holes corresponding to the end cover connecting light holes are respectively machined on the two ends of the inner cylinder (2), and the front end cover (4) and the rear end cover (7) are respectively fixedly connected with the two ends of the inner cylinder (2) through a plurality of end cover connecting bolts.

10. A liquid metal electrically conductive slip ring supported by gas floatation bearings according to claim 1 or 9, characterized in that: It also comprises a supporting and cooling outer cylinder (1), the supporting and cooling outer cylinder (1) is coaxially sleeved outside the inner cylinder (2), a ring groove is machined on the cylindrical surface of the inner cylinder (2), the two ends of the supporting and cooling outer cylinder (1) are respectively sealed and matched with the inner cylinder (2) through sealing rings, a water inlet (17) is machined on the upper part of the outer wall of the supporting and cooling outer cylinder (1), and a drain port (18) is machined on the side part of the outer wall of the supporting and cooling outer cylinder (1).

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