Air bearing and turbine impeller detection device

Abstract

The invention discloses an air bearing and turbine impeller detection device, and relates to the technical field of bearings, the air bearing and turbine impeller detection device comprises an inner ring, an outer ring, a pair of fixing covers, a pair of middle-layer semi-rings and a pair of outer-layer semi-rings, the inner diameter of the outer ring is larger than the outer diameter of the inner ring, the length of the inner ring is larger than that of the outer ring, the outer ring sleeves the inner ring, and the outer ring sleeves the outer ring. The fixing covers are in a circular ring shape and are fixedly arranged on the upper end face and the lower end face of the inner ring respectively, the fixing covers and the inner ring are coaxial, the outer diameter of the fixing covers is larger than the inner diameter of the outer ring, and the positions, close to the edges, of the upper end face and the lower end face of the outer ring extend outwards in the axial direction to be provided with protruding rings. According to the air bearing, high-pressure air can act on the side walls of the first protruding baffle and the second protruding baffle, the generated force can make the inner ring rotate, and the rotating direction is the same as the rotating direction of the turbine impeller, so that the rotating shaft and the turbine impeller are assisted to rotate, the function of the air bearing is increased, and the energy utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and specifically to an air bearing and a turbine impeller detection device. Background Art

[0002] An air bearing, also known as an aerostatic bearing, refers to a sliding bearing that uses gas (usually air, but it may also be other gases) as a lubricant.

[0003] After the impeller of the turbine in a turbocharger is produced, it needs to be inspected, including dynamic balance inspection. The inspection methods for the dynamic balance of the turbine impeller include the hard support dynamic balance method and the soft support dynamic balance method, etc. Among them, the soft support dynamic balance method can use an air bearing. For example, in the patent with the publication number CN104897342B, an air bearing device for dynamic balance measurement of the turbine shaft component of a vehicle supercharger can be seen. It is through an improved air bearing + external drive method, cooperating with an external detection system for dynamic balance detection. It mainly improves the rotation state of the shaft and the bearing, and enhances the stability of the soft support of the air bearing for the shaft.

[0004] However, the prior art has at least the following defects: First, the external drive in the prior art generally adopts the method of connecting a motor to the shaft end, and connecting a motor to the shaft end will inevitably affect the dynamic balance detection of the turbine impeller. Of course, the prior art also has the method of driving rotation by a belt. The belt belongs to soft support, and the detection accuracy is improved compared with the method of directly connecting a motor. However, as long as the belt drives the turbine impeller to rotate, the belt needs to contact the shaft end, which will affect the detection result of the dynamic balance. Therefore, the drive method needs to be improved. Second, the air bearing in the prior art needs to consume energy to fill high-pressure air, and this high-pressure air is only used to form an air film and has no other functions, resulting in a relatively low overall energy utilization rate. Therefore, the energy utilization rate still needs to be improved. Finally, the air inflation method of the air bearing in the prior art is to directly introduce high-pressure air from the ventilation holes on one side into the annular channel, and then directly act on the shaft (or the inner ring of the bearing) after passing through multiple radial air holes. The high-pressure air introduction method is relatively direct and simple. Once the externally introduced high-pressure air is unstable, the impact on the air film is also relatively direct. Therefore, the stability of air inflation still needs to be improved. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the present invention provides an air bearing and a turbine impeller detection device. First raised baffles arranged in a circular matrix are symmetrically provided on the upper and lower outer sidewalls of the inner ring. Second raised baffles arranged in a circular matrix are correspondingly provided on the upper and lower inner sidewalls of a pair of fixed covers. The first raised baffles are inclined to the axial direction of the inner ring, and the second raised baffles are inclined to the radial direction of the fixed cover. High-pressure air can act on the sidewalls of the first raised baffles and the second raised baffles, and the generated force can cause the inner ring to rotate, and the rotation direction is the same as that of the turbine impeller, thereby assisting the rotation of the rotating shaft and the turbine impeller, increasing the function of the air bearing, and improving the energy utilization rate.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: An air bearing includes an inner ring, an outer ring, a pair of fixed covers, a pair of middle half-rings, and a pair of outer half-rings. The inner diameter of the outer ring is greater than the outer diameter of the inner ring, and the length of the inner ring is greater than the length of the outer ring. The outer ring is sleeved on the inner ring. The fixed covers are circular rings, and the pair of fixed covers are respectively fixedly arranged on the upper and lower end faces of the inner ring. The fixed covers are coaxial with the inner ring. The outer diameter of the fixed covers is greater than the inner diameter of the outer ring. On the upper and lower end faces of the outer ring and near the edge positions, there are convex rings axially extending outward. The convex rings are integrally formed with the outer ring. The inner diameter of the convex rings is greater than the outer diameter of the fixed covers. A first axial channel is formed between the outer side wall of the inner ring and the inner side wall of the outer ring. On the outer side wall of the inner ring, there are first raised baffles arranged in a circular matrix and symmetrically up and down. The first raised baffles are inclined to the axis of the inner ring. The thrust of the high-pressure air on the first raised baffles can make the inner ring rotate, and the rotation direction is the same as the rotation direction of the rotating shaft. A radial channel is formed between the upper and lower end faces of the outer ring and the inner side walls of the pair of fixed covers. On the inner side walls of the pair of fixed covers, there are second raised baffles arranged in a circular matrix and corresponding up and down. The second raised baffles are inclined to the radius of the fixed covers. The thrust of the high-pressure air on the second raised baffles can make the fixed covers rotate, and the rotation direction is the same as the rotation direction of the rotating shaft. A second axial channel is formed between the side surfaces of the pair of fixed covers and the inner side walls of the convex rings. At the center position of the outer side wall of the outer ring, there is a middle ring groove opened in a circle. The pair of middle half-rings can be assembled into a complete ring, and the size is matched with the size of the middle ring groove. The pair of middle half-rings are spliced and arranged in the middle ring groove. At the center position of the outer side walls of the pair of middle half-rings, there is an outer ring groove opened in a circle. The pair of outer half-rings can be assembled into a complete ring, and the size is matched with the size of the outer ring groove. The pair of outer half-rings are spliced and arranged in the outer ring groove. At the center position of the side walls of the pair of outer half-rings, there is a through ventilation hole radially opened. There is a first-stage annular slot hole opened between the inner side walls of the pair of outer half-rings and the outer side walls of the pair of middle half-rings. At the center position of the side walls of the pair of middle half-rings, there are at least 6 through first-stage air inlet holes radially opened. There is a second-stage annular slot hole opened between the inner side walls of the pair of middle half-rings and the outer side wall of the outer ring. At the center position of the side wall of the outer ring, there are at least 6 through second-stage air inlet holes radially opened. The first-stage air inlet holes and the second-stage air inlet holes are respectively arranged in a circular matrix, and the positions of the first-stage air inlet holes and the second-stage air inlet holes are staggered from each other. The ventilation hole, the first-stage annular slot hole, the first-stage air inlet hole, the second-stage annular slot hole, the second-stage air inlet hole, the first axial channel, the radial channel, and the second axial channel are designed to be sequentially connected, and the aperture of the ventilation hole is greater than the aperture of the first-stage annular slot hole, the aperture of the first-stage annular slot hole is greater than the aperture of the first-stage air inlet hole, the aperture of the first-stage air inlet hole is greater than the aperture of the second-stage annular slot hole, and the aperture of the second-stage annular slot hole is greater than the aperture of the second-stage air inlet hole.

[0007] Preferably, the upper and lower edges of the outer side wall of the inner ring are designed with rounded corners in cooperation with the fixed cover, and the upper and lower edges of the inner side wall of the outer ring are designed with rounded corners.

[0008] Preferably, a pair of spliced retaining rings are provided on the outer side walls of the outer ring, the middle-layer half-ring, and the outer-layer half-ring, and the retaining rings are used to fix the outer ring, the middle-layer half-ring, and the outer-layer half-ring with screws.

[0009] Preferably, a pair of fixed covers are fixedly connected to the upper and lower end faces of the inner ring respectively by screws.

[0010] A turbine impeller detection device having the air bearing described above includes a workbench, a rotating shaft for installing the turbine impeller, a fixed cylinder, an upper cover, a detection system, an external control system, an external air induction system, and an external air supply system. The air bearing is installed at the center position of the workbench, and the outer ring of the air bearing is fixedly connected to the workbench. The rotating shaft passes through the inner ring of the air bearing and is fixedly connected to the inner side wall of the inner ring. The turbine impeller is fixedly installed on the upper part of the rotating shaft. The detection system is arranged at the center position of the lower bottom surface of the workbench and is connected to the lower end of the rotating shaft. A pipe groove communicating with the ventilation hole is opened on the lower bottom surface of the workbench, and an air pipe is arranged in the pipe groove. One end of the air pipe is connected to the ventilation hole, and the other end of the air pipe is connected to the external air supply system. The fixed cylinder is arranged on the upper surface of the workbench and is coaxial with the rotating shaft. At least 6 air inlets are evenly opened on the side wall of the fixed cylinder, and the air inlets correspond to the height of the turbine impeller. The upper cover is buckled on the upper end of the fixed cylinder and is connected to the fixed cylinder by a screwing method. An air suction port is arranged at the center position of the upper cover, and the air suction port is connected to the external air induction system. The external air induction system, the external air supply system, and the detection system are connected to the external control system.

[0011] Preferably, a fixing ring is arranged at a position close to the center on the side surface of the rotating shaft. The turbine impeller is sleeved on the upper part of the rotating shaft. Threads are arranged at a position close to the upper end of the upper part of the rotating shaft, and a fixing nut is screwed thereon. The fixing nut cooperates with the fixing ring to tightly fix the turbine impeller.

[0012] Preferably, a plurality of fixing rods are arranged on the outer side wall of the fixed cylinder and close to the air inlets, and a protective plate is arranged at the outer ends of the plurality of fixing rods.

[0013] Preferably, pressure rings are covered between the upper and lower end faces of the outer ring and the upper and lower surfaces of the workbench, and the pressure rings fix the outer ring and the workbench with screws.

[0014] The present invention provides an air bearing and a turbine impeller detection device, which have the following beneficial effects: 1. On the outer side wall of the inner ring, first raised baffles arranged in a circular matrix are symmetrically provided up and down. On the inner side walls of a pair of fixed covers, second raised baffles arranged in a circular matrix are correspondingly provided up and down. The first raised baffles are inclined to the axial direction of the inner ring, and the second raised baffles are inclined to the radial direction of the fixed cover. High-pressure air can act on the side walls of the first raised baffles and the second raised baffles, and the generated force can make the inner ring rotate, and the rotation direction is the same as that of the turbine impeller, thereby assisting the rotation of the rotating shaft and the turbine impeller, increasing the function of the air bearing, and improving the energy utilization rate; 2. In the present invention, high-pressure air enters the first axial channel through the ventilation holes, the first annular groove holes, the first air inlet holes, the second annular groove holes, and the second air inlet holes and acts on the inner ring. By adopting a step-by-step air intake method, the positions of the first air inlet holes and the second air inlet holes are staggered. Even when the high-pressure air entering through the ventilation holes is unstable, by means of grading and dispersing the pressure difference, the difference when the high-pressure air enters from the second air inlet holes at different positions will be reduced, ensuring the stability of the air film, and the use effect of the air bearing is better; 3. The present invention sucks air from the air suction port at the center position of the upper cover through an external air guiding system, making the cavity form a negative pressure, so that external air enters through the air inlet holes and acts on the turbine impeller to make it rotate, highly simulating the driving mode of the normal operation of the turbine impeller. Compared with the motor drive and belt drive in the prior art, the driving mode of the present invention is more in line with the actual working state. Cooperating with the air bearing of the present invention, it meets the requirements of high-speed rotation, is closer to the actual working state of the turbine impeller, and improves the detection accuracy. Description of the Drawings

[0015] Figure 1 It is the front sectional view of the whole air bearing and turbine impeller detection device of the present invention; Figure 2 It is the front sectional view of the air bearing of the present invention; Figure 3 It is the top sectional view of the air bearing of the present invention; Figure 4 It is the front view of the inner ring in the air bearing of the present invention; Figure 5 It is the top view of the bottom fixed cover in the air bearing of the present invention.

[0016] In the figure: 1, workbench; 2, air bearing; 3, rotating shaft; 4, turbine impeller; 5, fixed cylinder; 6, upper cover; 11, pipe groove; 12, air pipe; 13, pressure ring; 201, inner ring; 202, outer ring; 203, protruding ring; 204, fixed cover; 205, middle-layer half ring; 206, outer-layer half ring; 207, retaining ring; 208, fillet; 209, first protruding baffle; 210, second protruding baffle; 211, middle-layer ring groove; 212, outer-layer ring groove; 213, ventilation hole; 214, first-stage annular groove hole; 215, first-stage air inlet; 216, second-stage annular groove hole; 217, second-stage air inlet; 218, first axial channel; 219, radial channel; 220, second axial channel; 31, fixing ring; 32, fixing nut; 51, air inlet; 52, fixing rod; 53, protective plate; 61, air suction port. Specific implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Such as Figures 1-5As shown in the figure, an air bearing includes an inner ring 201, an outer ring 202, a pair of fixed covers 204, a pair of middle half-rings 205 and a pair of outer half-rings 206. The inner diameter of the outer ring 202 is greater than the outer diameter of the inner ring 201, and the length of the inner ring 201 is greater than the length of the outer ring 202. The outer ring 202 is sleeved on the inner ring 201. The fixed covers 204 are circular rings, and a pair of fixed covers 204 are respectively fixedly arranged on the upper and lower end faces of the inner ring 201. The fixed covers 204 are coaxial with the inner ring 201. The outer diameter of the fixed covers 204 is greater than the inner diameter of the outer ring 202. On the upper and lower end faces of the outer ring 202 and near the edge positions, there are protruding rings 203 axially extending outwards. The protruding rings 203 and the outer ring 202 are integrally formed. The inner diameter of the protruding rings 203 is greater than the outer diameter of the fixed covers 204. A first axial channel 218 is formed between the outer side wall of the inner ring 201 and the inner side wall of the outer ring 202. On the outer side wall of the inner ring 201, there are first protruding baffles 209 arranged in a circular matrix and symmetrically up and down. The first protruding baffles 209 are inclined to the axis of the inner ring 201. The thrust of the high-pressure air on the first protruding baffles 209 can make the inner ring 201 rotate and the rotation direction is the same as the rotation direction of the rotating shaft 3. A radial channel 219 is formed between the upper and lower end faces of the outer ring 202 and the inner side walls of a pair of fixed covers 204. On the inner side walls of a pair of fixed covers 204, there are second protruding baffles 210 arranged in a circular matrix and corresponding up and down. The second protruding baffles 210 are inclined to the radius of the fixed covers 204. The thrust of the high-pressure air on the second protruding baffles 210 can make the fixed covers 204 rotate and the rotation direction is the same as the rotation direction of the rotating shaft 3. A second axial channel 220 is formed between the side surfaces of a pair of fixed covers 204 and the inner side walls of the protruding rings 203. At the center position of the outer side wall of the outer ring 202, there is a middle ring groove 211. A pair of middle half-rings 205 can be assembled into a complete ring and the size is matched with the size of the middle ring groove 211. A pair of middle half-rings 205 are spliced and arranged in the middle ring groove 211. At the center position of the outer side walls of a pair of middle half-rings 205, there is an outer ring groove 212. A pair of outer half-rings 206 can be assembled into a complete ring and the size is matched with the size of the outer ring groove 212. A pair of outer half-rings 206 are spliced and arranged in the outer ring groove 212. At the center position of the side walls of a pair of outer half-rings 206, there is a through ventilation hole 213 radially. Between the inner side walls of a pair of outer half-rings 206 and the outer side walls of a pair of middle half-rings 205, there is a first-level annular slot hole 214. At the center position of the side walls of a pair of middle half-rings 205, there are at least 6 through first-level air inlet holes 215 radially. Between the inner side walls of a pair of middle half-rings 205 and the outer side wall of the outer ring 202, there is a second-level annular slot hole 216. At the center position of the side wall of the outer ring 202, there are at least 6 through second-level air inlet holes 217 radially. The first-level air inlet holes 215 and the second-level air inlet holes 217 are respectively arranged in a circular matrix and the positions of the first-level air inlet holes 215 and the second-level air inlet holes 217 are staggered from each other.The vent hole 213, the first-stage annular groove hole 214, the first-stage air inlet hole 215, the second-stage annular groove hole 216, the second-stage air inlet hole 217, the first axial channel 218, the radial channel 219, and the second axial channel 220 are designed to be connected in sequence, and the aperture of the vent hole 213 is larger than that of the first-stage annular groove hole 214, the aperture of the first-stage annular groove hole 214 is larger than that of the first-stage air inlet hole 215, the aperture of the first-stage air inlet hole 215 is larger than that of the second-stage annular groove hole 216, and the aperture of the second-stage annular groove hole 216 is larger than that of the second-stage air inlet hole 217; the positions of the upper and lower edges of the outer side wall of the inner ring 201 are designed with rounded corners 208 in cooperation with the fixed cover 204, and the positions of the upper and lower edges of the inner side wall of the outer ring 202 are designed with rounded corners 208; a pair of spliced retaining rings 207 are provided on the outer side walls of the outer ring 202, the middle-layer half-ring 205, and the outer-layer half-ring 206, and the retaining rings 207 are used to fix the outer ring 202, the middle-layer half-ring 205, and the outer-layer half-ring 206 with screws; a pair of fixed covers 204 are fixedly connected to the upper and lower end faces of the inner ring 201 with screws.,

[0019] A turbine impeller detection device with the described air bearing, comprising a workbench 1, a rotating shaft 3 for installing the turbine impeller 4, a fixed cylinder 5, an upper cover 6, a detection system, an external control system, an external air suction system, and an external air supply system. The air bearing 2 is installed at the center of the workbench 1, and the outer ring 202 of the air bearing 2 is fixedly connected to the workbench 1. The rotating shaft 3 penetrates through the inner ring 201 of the air bearing 2 and is fixedly connected to the inner side wall of the inner ring 201. The turbine impeller 4 is fixedly installed on the upper part of the rotating shaft 3. The detection system is arranged at the center of the lower bottom surface of the workbench 1 and is connected to the lower end of the rotating shaft 3. A pipe groove 11 communicating with the ventilation hole 213 is formed on the lower bottom surface of the workbench 1, and an air pipe 12 is arranged in the pipe groove 11. One end of the air pipe 12 is connected to the ventilation hole 213, and the other end of the air pipe 12 is connected to the external air supply system. The fixed cylinder 5 is arranged on the upper surface of the workbench 1 and is coaxial with the rotating shaft 3. At least 6 air inlets 51 are evenly formed on the side wall of the fixed cylinder 5, and the air inlets 51 correspond to the height of the turbine impeller 4. The upper cover 6 is buckled on the upper end of the fixed cylinder 5 and is connected to the fixed cylinder 5 by a screwing method. An air suction port 61 is arranged at the center of the upper cover 6, and the air suction port 61 is connected to the external air suction system. The external air suction system, the external air supply system, the detection system, and the external control system are connected; A fixing ring 31 is arranged at a position close to the center on the side surface of the rotating shaft 3. The turbine impeller 4 is sleeved on the upper part of the rotating shaft 3. A thread is arranged at a position close to the upper end on the upper part of the rotating shaft 3, and a fixing nut 32 is screwed thereon. The fixing nut 32 cooperates with the fixing ring 31 to tightly fix the turbine impeller 4; A plurality of fixing rods 52 are arranged on the outer side wall of the fixed cylinder 5 and at a position close to the air inlet 51. A protective plate 53 is arranged at the outer ends of the plurality of fixing rods 52; A pressure ring 13 is covered between the upper and lower end surfaces of the outer ring 202 and the upper and lower surfaces of the workbench 1. The pressure ring 13 fixes the outer ring 202 and the workbench 1 by screws.

[0020] The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, which are as follows: According to the attached drawings of the specification Figures 1-5 It can be seen that when the air bearing 2 of the present invention works, high-pressure air (or other gases) is provided by the external air supply system. The high-pressure air enters from the ventilation hole 213, passes through the first-stage annular slot hole 214, the first-stage air inlet hole 215, the second-stage annular slot hole 216, and the second-stage air inlet hole 217 and enters the first axial channel 218. Since the second-stage air inlet hole 217 is at the center position, the high-pressure air is evenly divided into upper and lower paths and flows along the first axial channel 218 to the radial channel 219 formed between the upper and lower end surfaces of the outer ring 202 and the inner side walls of a pair of fixed covers 204, and flows out from the second axial channel 220 formed between the side surfaces of a pair of fixed covers 204 and the inner side wall of the protruding ring 203. The attached drawings of the specification Figures 2-5The direction of the middle arrow represents the flow direction of the high-pressure air. During this process, the high-pressure air forms an air film in the first axial channel 218 , the radial channel 219 and the second axial channel 220 , playing the role of the air bearing 2 .

[0021] In the present invention, the outer wall of the inner ring 201 is symmetrically provided with first raised baffles 209 arranged in an annular matrix, such as Figure 4 As shown, the first raised baffle 209 is inclined to the axial direction of the inner ring 201. Through mechanical analysis, it can be known that the thrust generated by the high-pressure air on the first raised baffle 209 can cause the first raised baffle 209 and the inner ring 201 to rotate. Here, the symmetrical design also makes the first raised baffles 209 on both sides of the center of the inner ring 201 tend to rotate in the same direction. At the same time, the forces in the vertical direction offset each other to ensure the vertical stability of the inner ring 201. It should be noted that when designing, the inclination direction of the first raised baffle 209 satisfies that when the high-pressure air pushes, the inner ring 201 and the rotating shaft 3 (including the turbine impeller 4) have the same rotation direction. Those skilled in the art can understand that, in addition, the inner side walls of a pair of fixed covers 204 are correspondingly provided with second raised baffles 210 arranged in a ring matrix, as shown in FIG. Figure 5 As shown, the second raised baffle 210 is inclined to the radial direction of the fixed cover 204, and has the same principle as the first raised baffle 209. The thrust of the high-pressure air on the second raised baffle 210 can cause the fixed cover 204 to rotate, and the rotation direction is the same as the rotation direction of the rotating shaft 3 (including the turbine impeller 4). Here, the raised height of the first raised baffle 209 and the second raised baffle 210 does not affect the flow of most high-pressure air. The present invention assists the rotation of the rotating shaft 3 and the turbine impeller 4 through the design of the first raised baffle 209 and the second raised baffle 210, increases the function of the air bearing 2, reduces the load of the external drive on the rotating shaft 3, saves energy, and improves energy utilization.

[0022] In the present invention, the aperture of the vent hole 213 is larger than the aperture of the primary annular slot 214, the aperture of the primary annular slot 214 is larger than the aperture of the primary air inlet 215, the aperture of the primary air inlet 215 is larger than the aperture of the secondary annular slot 216, the aperture of the secondary annular slot 216 is larger than the aperture of the secondary air inlet 217, and the high-pressure air enters the first axial channel 21 through the vent hole 213, the primary annular slot 214, the primary air inlet 215, the secondary annular slot 216, and the secondary air inlet 217. 8, acting on the inner ring 201, adopting a step-by-step air intake method to ensure the stability of the high-pressure air flow, so that the air film formed between the inner ring 201 and the outer ring 202 is stable. Even if the high-pressure air entering through the air vent 213 is unstable, the difference in high-pressure air entering through the secondary air inlet holes 217 at different positions can be reduced by dispersing the pressure difference in stages and staggering the positions of the primary air inlet holes 215 and the secondary air inlet holes 217, thereby ensuring the stability of the air film and achieving a better use effect of the air bearing 2.

[0023] Among them, the upper and lower edges of the outer wall of the inner ring 201 are designed with rounded corners 208 in cooperation with the fixed cover 204, and the upper and lower edges of the inner wall of the outer ring 202 are designed with rounded corners 208. The high-pressure air will flow more smoothly through the inflection point here, reducing the resistance.

[0024] Among them, a pair of spliced retaining rings 207 are provided on the outer walls of the outer ring 202, the middle-layer half-ring 205, and the outer-layer half-ring 206. The retaining rings 207 fix the outer ring 202, the middle-layer half-ring 205, and the outer-layer half-ring 206 through screws, which is convenient for installation and disassembly. At the same time, the retaining rings 207 also have a certain sealing effect.

[0025] Among them, a pair of fixed covers 204 are fixedly connected to the upper and lower end faces of the inner ring 201 through screws respectively, which is convenient for installation and disassembly.

[0026] In the present invention, the sealing of the air bearing 2 is very important, which is common knowledge in the art. The present invention can adopt the sealing design of the existing technology, and the present invention will not elaborate.

[0027] The turbine impeller 4 detection device of the present invention applies the air bearing 2 of the above embodiment. Before the turbine impeller 4 detection device works, the air bearing 2 is arranged on the workbench 1, and then the rotating shaft 3 for installing the turbine impeller 4 is arranged in the inner ring 201 of the air bearing 2. It can be in an interference fit manner (no disassembly is required subsequently). Here, the rotating shaft 3 is specially customized for detecting the turbine impeller 4 and is not the rotating shaft 3 of the turbine. Its design is strict and standardized, and it is stable when working independently. When detecting, it is used as the rotating shaft 3 of the turbine impeller 4 to transmit its working state, which is convenient for detection. The air vent 213 of the air bearing 2 is connected to the air pipe 12, and the air pipe 12 passes through the pipe slot 11 and is connected to the external air supply system, and the external air supply system provides high-pressure air. The detection system can be arranged at the center position of the lower bottom surface of the workbench 1 and is connected to the lower end of the rotating shaft 3 for subsequent detection of the dynamic balance, axial force, etc. of the turbine impeller 4 in the working state. The external air extraction system is connected to the air suction port 61 of the upper cover 6. The external air extraction system connection, the external air supply system, the detection system are connected to the external control system. Here, the external air extraction system connection, the external air supply system, the detection system, the external control system, and the connections therebetween can all adopt the existing technology, and the present invention will not elaborate. The above installations are all prepared in advance, and no disassembly is required for subsequent detection, and only regular maintenance is needed.

[0028] When the detection device of the turbine impeller 4 is working, the turbine impeller 4 is installed on the upper part of the rotating shaft 3. The existing fixing method can be adopted, as long as it is ensured that the turbine impeller 4 and the rotating shaft 3 cannot move or rotate relative to each other. The upper cover 6 is closed. The upper cover 6 can be connected to the fixed cylinder 5 by a threaded connection. The external air induction system works, inhaling air from the air suction port 61 at the center position of the upper cover 6, so that the cavity formed by the upper cover 6, the fixed cylinder 5 and the workbench 1 is in a negative pressure state. As a result, external air enters from the air inlet 51 on the side wall of the fixed cylinder 5 and at the same height as the turbine impeller 4. The entering air acts on the turbine impeller 4 to make it rotate. The arrow direction in the attached Figure 1 of the specification represents the air flow direction. The faster the air flow rate, the faster the turbine impeller 4 and the rotating shaft 3 rotate. It simulates the driving method of the turbine impeller 4 under normal working conditions. Compared with the motor drive and belt drive of the prior art, the driving method of the present invention is more in line with the actual working state. Combined with the air bearing 2 of the present invention, it can assist the rotation of the rotating shaft 3 and the turbine impeller 4, and the formed air film meets the requirements of high-speed rotation, which is closer to the actual working state of the turbine impeller 4 and improves the detection accuracy.

[0029] Among them, a fixing ring 31 is arranged at a position close to the center on the side surface of the rotating shaft 3. The turbine impeller 4 is sleeved on the upper part of the rotating shaft 3. Threads are arranged at a position close to the upper end of the upper part of the rotating shaft 3, and a fixing nut 32 is screwed thereon. The fixing nut 32 cooperates with the fixing ring 31 to compress and fix the turbine impeller 4. The fixing method is simple, and the installation and disassembly are convenient. Whether to design a key connection here depends on the actual situation, as long as it is ensured that the turbine impeller 4 and the rotating shaft 3 will not move or rotate relative to each other.

[0030] Among them, a plurality of fixing rods 52 are arranged on the outer side wall of the fixed cylinder 5 and at a position close to the air inlet 51. A protective plate 53 is arranged at the outer end of the plurality of fixing rods 52. The protective plate 53 is used to radially block the air and change the direction of the air entering the air inlet 51 to avoid potential safety hazards when people approach.

[0031] Among them, pressure rings 13 are covered between the upper and lower end faces of the outer ring 202 and the upper and lower surfaces of the workbench 1. The pressure rings 13 fix the outer ring 202 and the workbench 1 by screws. The fixing method is simple, convenient for disassembly and installation, and conducive to repair and maintenance.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air bearing, characterized in that, It includes an inner ring (201), an outer ring (202), a pair of fixed covers (204), a pair of middle-layer half rings (205) and a pair of outer-layer half rings (206). The inner diameter of the outer ring (202) is greater than the outer diameter of the inner ring (201), and the length of the inner ring (201) is greater than the length of the outer ring (202). The outer ring (202) is sleeved on the inner ring (201). The fixed cover (204) is circular, and the pair of fixed covers (204) are respectively fixedly arranged on the upper and lower end faces of the inner ring (201). The fixed cover (204) is coaxial with the inner ring (201). The outer diameter of the fixed cover (204) is greater than the inner diameter of the outer ring (202). On the upper and lower end faces of the outer ring (202) and at positions close to the edge, there are convex rings (203) axially extending outwards. The convex ring (203) and the outer ring (202) are integrally formed. The inner diameter of the convex ring (203) is greater than the outer diameter of the fixed cover (204). A first axial channel (218) is formed between the outer side wall of the inner ring (201) and the inner side wall of the outer ring (202). On the outer side wall of the inner ring (201), there are first raised baffles (209) arranged in a circular matrix and symmetrically up and down. The first raised baffle (209) is inclined to the axis of the inner ring (201). The thrust of the high-pressure air on the first raised baffle (209) can make the inner ring (201) rotate in the same direction as the rotation direction of the rotating shaft (3). A radial channel (219) is formed between the upper and lower end faces of the outer ring (202) and the inner side walls of the pair of fixed covers (204). On the inner side walls of the pair of fixed covers (204), there are second raised baffles (210) arranged in a circular matrix and corresponding up and down. The second raised baffle (210) is inclined to the radius of the fixed cover (204). The thrust of the high-pressure air on the second raised baffle (210) can make the fixed cover (204) rotate in the same direction as the rotation direction of the rotating shaft (3). A second axial channel (220) is formed between the side surfaces of the pair of fixed covers (204) and the inner side walls of the convex rings (203). At the central position of the outer side wall of the outer ring (202), there is a middle-layer ring groove (211). The pair of middle-layer half rings (205) can be assembled into a complete ring and their sizes match the size of the middle-layer ring groove (211). The pair of middle-layer half rings (205) are spliced and arranged in the middle-layer ring groove (211). At the central position of the outer side walls of the pair of middle-layer half rings (205), there is an outer-layer ring groove (212). The pair of outer-layer half rings (206) can be assembled into a complete ring and their sizes match the size of the outer-layer ring groove (212). The pair of outer-layer half rings (206) are spliced and arranged in the outer-layer ring groove (212). At the central position of the side walls of the pair of outer-layer half rings (206), there is a through ventilation hole (213) radially. Between the inner side walls of the pair of outer-layer half rings (206) and the outer side walls of the pair of middle-layer half rings (205), there is a first-stage annular slot hole (214). At the central position of the side walls of the pair of middle-layer half rings (205), there are at least 6 through first-stage air inlet holes (215).A secondary annular slot hole (216) is provided between the inner side walls of a pair of middle-layer semi-rings (205) and the outer side wall of the outer ring (202). At least six through secondary air inlet holes (217) are radially provided at the central position of the side wall of the outer ring (202). The primary air inlet holes (215) and the secondary air inlet holes (217) are respectively arranged in an annular matrix, and the positions of the primary air inlet holes (215) and the secondary air inlet holes (217) are staggered from each other. The air vent holes (213), the primary annular slot holes (214), the primary air inlet holes (215), the secondary annular slot holes (216), the secondary air inlet holes (217), the first axial channel (218), the radial channel (219), and the second axial channel (220) are designed to be sequentially connected. Moreover, the aperture of the air vent holes (213) is larger than the aperture of the primary annular slot holes (214), the aperture of the primary annular slot holes (214) is larger than the aperture of the primary air inlet holes (215), the aperture of the primary air inlet holes (215) is larger than the aperture of the secondary annular slot holes (216), and the aperture of the secondary annular slot holes (216) is larger than the aperture of the secondary air inlet holes (217).

2. The air bearing according to claim 1, characterized in that, The positions of the upper and lower edges of the outer wall of the inner ring (201) are designed with rounded corners (208) in cooperation with the fixed cover (204), and the positions of the upper and lower edges of the inner wall of the outer ring (202) are designed with rounded corners (208).

3. An air bearing according to claim 1, characterized in that, A pair of spliced retaining rings (207) are provided on the outer side walls of the outer ring (202), the middle half-ring (205), and the outer half-ring (206), and the retaining rings (207) fix the outer ring (202), the middle half-ring (205), and the outer half-ring (206) by screws.

4. An air bearing according to claim 1, wherein A pair of fixed covers (204) are fixedly connected to the upper and lower end faces of the inner ring (201) by screws respectively.

5. A turbine impeller detection device having the air bearing described in claim 1, characterized in that, It includes a workbench (1), a rotating shaft (3) for installing a turbine impeller (4), a fixed cylinder (5), an upper cover (6), a detection system, an external control system, an external air intake system, and an external air supply system. The air bearing (2) is installed at the central position of the workbench (1), and the outer ring (202) of the air bearing (2) is fixedly connected to the workbench (1). The rotating shaft (3) passes through the inner ring (201) of the air bearing (2) and is fixedly connected to the inner side wall of the inner ring (201). The turbine impeller (4) is fixedly installed on the upper part of the rotating shaft (3). The detection system is arranged at the central position of the lower bottom surface of the workbench (1) and is connected to the lower end of the rotating shaft (3). A pipe groove (11) communicating with a ventilation hole (213) is provided on the lower bottom surface of the workbench (1), and an air pipe (12) is arranged in the pipe groove (11). One end of the air pipe (12) is connected to the ventilation hole (213), and the other end of the air pipe (12) is connected to the external air supply system. The fixed cylinder (5) is arranged on the upper surface of the workbench (1) and is coaxial with the rotating shaft (3). At least six air inlets (51) are evenly arranged on the side wall of the fixed cylinder (5), and the air inlets (51) correspond to the height of the turbine impeller (4). The upper cover (6) is buckled on the upper end of the fixed cylinder (5) and is connected to the fixed cylinder (5) by a screwing method. An air suction port (61) is arranged at the central position of the upper cover (6), and the air suction port (61) is connected to the external air intake system. The external air intake system, the external air supply system, the detection system, and the external control system are connected.

6. The turbine impeller detection device according to claim 5, characterized in that A fixing ring (31) is arranged at a position close to the center on the side surface of the rotating shaft (3). The turbine impeller (4) is sleeved on the upper part of the rotating shaft (3). Threads are provided at a position close to the upper end on the upper part of the rotating shaft (3), and a fixing nut (32) is screwed thereon. The fixing nut (32) cooperates with the fixing ring (31) to press and fix the turbine impeller (4).

7. The turbine impeller detection device according to claim 5, characterized in that, A plurality of fixing rods (52) are arranged on the outer side wall of the fixed cylinder (5) and at a position close to the air inlets (51), and a protective plate (53) is arranged at the outer ends of the plurality of fixing rods (52).

8. The turbine impeller detection device according to claim 5, characterized in that A pressure ring (13) is covered between the upper and lower end faces of the outer ring (202) and the upper and lower surfaces of the workbench (1), and the pressure ring (13) fixes the outer ring (202) and the workbench (1) by screws.

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