Air bearing and turbine impeller detection device

Abstract

The present invention discloses an air bearing and a turbine impeller detection device, which relate to the technical field of bearings, and include an inner ring, an outer ring, a pair of fixed covers, a pair of middle semi-rings and a pair of outer semi-rings, the inner diameter of the outer ring being larger than the outer diameter of the inner ring, the length of the inner ring being larger than the length of the outer ring, the outer ring sleeve being arranged on the inner ring, the fixed cover being annular and the pair of fixed covers being fixedly arranged on the upper and lower end faces of the inner ring, respectively, the fixed cover being coaxial with the inner ring, the outer diameter of the fixed cover being larger than the inner diameter of the outer ring, and the upper and lower end faces of the outer ring and positions near the edges being axially extended outwardly with protruding rings; in the present invention, high-pressure air can act on the side walls of the first and second protruding baffles, and the force generated thereby can cause the inner ring to rotate, and the rotation direction is the same as the rotation direction 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 energy utilization.

Description

Technical Field

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

[0002] Air bearings, also known as air bearings, refer to sliding bearings that use gas (usually air, but it can also be other gases) as a lubricant.

[0003] After the impeller of the turbine in the turbocharger is produced, it needs to be tested, including dynamic balancing. The testing methods for turbine impeller dynamic balancing include hard support dynamic balancing method and soft support dynamic balancing method. Among them, the soft support dynamic balancing method can use air bearings. For example, the air bearing device for dynamic balancing measurement of automotive supercharger turbine shaft components in announcement number CN104897342B can be seen. It can be seen that it uses a modified air bearing + external drive method and cooperates with an external detection system for dynamic balancing detection. It mainly improves the rotation state of the shaft and bearing, and enhances the stability of the air bearing's soft support of the shaft.

[0004] However, the prior art has at least the following drawbacks: First, the external drive in the prior art generally adopts the method of connecting a motor to the shaft end, which inevitably affects the dynamic balance detection of the turbine impeller. Of course, the prior art also adopts a belt-driven rotation method. The belt is a soft support, which improves the detection accuracy compared to the method of directly connecting to the motor. However, as long as the belt drives the turbine impeller to rotate, it needs to contact the shaft end, which will affect the dynamic balance detection results. Therefore, the drive method needs to be improved. Second, the prior art air bearing consumes energy to fill it with high-pressure air, and this high-pressure air is only used to form the air film and has no other functions, resulting in low overall energy utilization. Therefore, energy utilization efficiency needs to be improved. Finally, the prior art air bearing is filled with high-pressure air directly from a vent on one side into the annular channel, and then through multiple radial vents to directly act on the shaft (or the inner ring of the bearing). The high-pressure air introduction method is relatively direct and simple. If the external high-pressure air is unstable, it will also directly affect the air film. Therefore, the stability of the filling needs to be improved. Summary of the Invention

[0005] In response to the above-mentioned deficiencies in the prior art, the present invention provides an air bearing and turbine impeller detection device, wherein first raised baffles arranged in a ring matrix are symmetrically arranged on the upper and lower outer walls of the inner ring, and second raised baffles arranged in a ring matrix are correspondingly arranged on the upper and lower inner walls of a pair of fixed covers. The first raised baffle is inclined to the axial direction of the inner ring, and the second raised baffle is inclined to the radial direction of the fixed cover. High-pressure air can act on the side walls of the first raised baffle and the second raised baffle, and the force generated can cause the inner ring to rotate, and the rotation direction is the same as the rotation direction 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 energy utilization.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an air bearing, comprising 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 larger than the outer diameter of the inner ring, the length of the inner ring is larger than the length of the outer ring, the outer ring sleeve is arranged on the inner ring, the fixed cover is annular and a pair of fixed covers are fixedly arranged on the upper and lower end faces of the inner ring respectively, the fixed cover and the inner ring are coaxial, the outer diameter of the fixed cover is larger than the inner diameter of the outer ring, the upper and lower end faces of the outer ring and the position near the edge are axially extended outward with a protruding ring, the protruding ring and the outer ring are integrally formed, the inner diameter of the protruding ring is larger than the outer diameter of the fixed cover, the outer side wall of the inner ring is aligned with the outer A first axial channel is formed between the inner side walls of the rings, and the outer side wall of the inner ring is symmetrically provided with first raised baffles arranged in an annular matrix, and the first raised baffles are inclined to the axial direction 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 shaft. A radial channel is formed between the upper and lower end faces of the outer ring and the inner side walls of a pair of fixed covers, and the inner side walls of the pair of fixed covers are correspondingly provided with second raised baffles arranged in an annular matrix, and the second raised baffles are inclined to the radial direction of the fixed cover. The thrust of the high-pressure air on the second raised baffles can make the fixed cover rotate and the rotation direction is the same as the rotation direction of the shaft. A second axial channel is formed between the side surface of the pair of fixed covers and the inner side wall of the protruding ring The channel has a circle of middle ring grooves at the center of the outer wall of the outer ring, a pair of middle semi-rings can be assembled into a complete ring and the size matches the size of the middle ring groove, a pair of middle semi-rings are spliced and arranged in the middle ring groove, a circle of outer ring grooves are opened at the center of the outer wall of a pair of middle semi-rings, a pair of outer semi-rings can be assembled into a complete ring and the size matches the size of the outer ring groove, a pair of outer semi-rings are spliced and arranged in the outer ring groove, a through air hole is radially opened at the center of the side wall of a pair of outer semi-rings, a first-level annular groove is opened between the inner side wall of the pair of outer semi-rings and the outer side wall of the pair of middle semi-rings, and at least 6 through-level air inlet holes are radially opened at the center of the side wall of a pair of middle semi-rings A secondary annular slot is provided between the inner side wall of a pair of middle semi-rings and the outer side wall of the outer ring, and at least 6 penetrating secondary air inlet holes are radially provided at the center position of the outer ring side wall. The primary air inlet holes and the secondary air inlet holes are arranged in a ring matrix, and the positions of the primary air inlet holes and the secondary air inlet holes are staggered with each other. The air vents, primary annular slots, primary air inlet holes, secondary annular slots, secondary air inlet holes, first axial channels, radial channels, and second axial channels are designed to be connected in sequence, and the aperture of the air vents is larger than the aperture of the primary annular slots, the aperture of the primary annular slots is larger than the aperture of the primary air inlet holes, the aperture of the primary air inlet holes is larger than the aperture of the secondary annular slots, and the aperture of the secondary annular slots is larger than the aperture of the secondary air inlet holes.

[0007] Preferably, the upper and lower edges of the outer side wall of the inner ring are designed with rounded corners to match 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, the outer side walls of the outer ring, the middle half ring and the outer half ring are provided with a pair of spliced retaining rings, and the retaining rings are fixed to the outer ring, the middle half ring and the outer half ring by screws.

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

[0010] A turbine impeller detection device with the air bearing comprises a workbench, a rotating shaft for installing the turbine impeller, a fixing cylinder, an upper cover, a detection system, an external control system, an external air induced system and an external air supply system. The air bearing is installed at the center 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 of the bottom surface of the workbench and is connected to the lower end of the rotating shaft. The bottom surface of the workbench is provided with a The pipe groove of the vent is provided with an air pipe, one end of the air pipe is connected to the vent, 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. The side wall of the fixed cylinder is evenly provided with at least 6 air inlets 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 screwing. An air intake is provided at the center of the upper cover, and the air intake is connected to the external air induced system, the external air induced system, the external air supply system, the detection system and the external control system.

[0011] Preferably, a fixing ring is provided on the side surface of the rotating shaft near the center, the turbine impeller is sleeved on the upper part of the rotating shaft, a thread is provided on the upper part of the rotating shaft near the upper end, and a fixing nut is screwed on it, and the fixing nut cooperates with the fixing ring to press and fix the turbine impeller.

[0012] Preferably, a plurality of fixing rods are provided on the outer side wall of the fixing cylinder and located near the air inlet, and a protective plate is provided at one end of the outer sides of the plurality of fixing rods.

[0013] Preferably, a pressure ring is provided between the upper and lower end surfaces of the outer ring and the upper and lower surfaces of the workbench, and the pressure ring fixes the outer ring to the workbench by screws.

[0014] The present invention provides an air bearing and turbine impeller detection device, which has the following beneficial effects:

[0015] 1. This invention features first raised baffles arranged in a circular matrix, symmetrically arranged on the upper and lower outer walls of the inner ring. Second raised baffles, arranged in a circular matrix, are correspondingly arranged on the upper and lower inner walls of a pair of fixed covers. The first raised baffles are inclined axially with respect to the inner ring, while the second raised baffles are inclined radially with respect to the fixed covers. High-pressure air acts on the sidewalls of the first and second raised baffles, generating a force that causes the inner ring to rotate in the same direction as the turbine impeller, thereby assisting the rotation of the shaft and turbine impeller. This enhances the functionality of the air bearing and improves energy efficiency.

[0016] 2. In the present invention, high-pressure air enters the first axial channel through the vent, primary annular slot, primary air inlet, secondary annular slot, and secondary air inlet, and acts on the inner ring. A step-by-step air intake method is adopted, with the primary and secondary air inlet holes staggered. Even if the high-pressure air entering the vent is unstable, the pressure difference is dispersed in stages, reducing the difference when the high-pressure air enters from the secondary air inlet holes at different positions. This ensures the stability of the air film and improves the performance of the air bearing.

[0017] 3. The present invention draws air from the air intake port at the center of the upper cover through an external air induced system, forming a negative pressure in the cavity, thereby allowing external air to enter through the air inlet and act on the turbine impeller to 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. Combined with the air bearing of the present invention, it meets the high-speed rotation requirements, is closer to the actual working state of the turbine impeller, and improves the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front cross-sectional view of the entire air bearing and turbine impeller detection device of the present invention;

[0019] Figure 2 is a front cross-sectional view of the air bearing of the present invention;

[0020] Figure 3 is a top cross-sectional view of the air bearing of the present invention;

[0021] Figure 4 A front view of the inner ring of the air bearing of the present invention;

[0022] Figure 5 This is a top view of the bottom fixed cover in the air bearing of the present invention.

[0023] 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 half ring; 206, outer half ring; 207, retaining ring; 208, fillet; 209, first raised baffle; 210, second raised baffle; 211. Middle ring groove; 212. Outer ring groove; 213. Vent; 214. Primary ring groove; 215. Primary air inlet; 216. Secondary ring groove; 217. Secondary 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 intake. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figure 1-5As shown, an air bearing comprises 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, 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 annular and the pair of fixed covers 204 are fixedly arranged on the upper and lower end surfaces of the inner ring 201 respectively, 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, and the upper and lower end surfaces of the outer ring 202 and the position near the edge are axially extended outward with a protruding ring 203, and the protruding ring 203 and the outer ring 202 are integrally formed. The inner diameter of the protruding ring 203 is larger than the outer diameter of the fixed cover 204, and a first axial channel 218 is formed between the outer wall of the inner ring 201 and the inner wall of the outer ring 202. The outer wall of the inner ring 201 is symmetrically provided with first raised baffles 209 arranged in a ring matrix, and the first raised baffles 209 are inclined to the axial direction of the inner ring 201. The thrust of the high-pressure air on the first raised baffles 209 can make the inner ring 201 rotate and the rotation direction is the same as the rotation direction of the 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. The inner side walls of the pair of fixed covers 204 are correspondingly provided with second raised baffles 210 arranged in a ring matrix, and the second raised baffles 210 are inclined to the fixed cover 2 04 radially, the thrust of the high-pressure air on the second raised baffle 210 can make the fixed cover 204 rotate and the rotation direction is the same as the rotation direction of the shaft 3, and a second axial channel 220 is formed between the side surface of a pair of fixed covers 204 and the inner wall of the protruding ring 203. A circle of middle-layer ring groove 211 is provided at the center position of the outer wall of the outer ring 202, and a pair of middle-layer semi-rings 205 can be assembled into a complete ring and the size matches the size of the middle-layer ring groove 211. A pair of middle-layer semi-rings 205 are spliced and arranged in the middle-layer ring groove 211, and a circle of outer-layer ring groove 212 is provided at the center position of the outer wall of a pair of middle-layer semi-rings 205. A pair of outer-layer semi-rings 206 can be assembled into a complete ring and the size matches the size of the outer-layer ring groove 212. 206 are spliced and arranged in the outer annular groove 212, a pair of outer semi-rings 206 are radially provided with a through vent hole 213 at the center position of the side wall, a pair of outer semi-rings 206 are provided with a first-level annular slot 214 between the inner side walls of the pair of outer semi-rings 206 and the outer side walls of the pair of middle semi-rings 205, at least 6 through-level first-level air inlet holes 215 are radially provided at the center position of the side wall of the pair of middle semi-rings 205, a pair of middle semi-rings 205 are provided with a second-level annular slot 216 between the inner side walls of the pair of middle semi-rings 205 and the outer side wall of the outer ring 202, at least 6 through-level second-level air inlet holes 217 are radially provided at the center position of the side wall of the outer ring 202, the first-level air inlet holes 215 and the second-level air inlet holes 217 are arranged in a ring matrix respectively, and the positions of the first-level air inlet holes 215 and the second-level air inlet holes 217 are staggered with each other,The vent hole 213, the first annular slot 214, the first air inlet 215, the second annular slot 216, the second air inlet 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 the aperture of the first annular slot 214, the aperture of the first annular slot 214 is larger than the aperture of the first air inlet 215, the aperture of the first air inlet 215 is larger than the aperture of the second annular slot 216, and the aperture of the second annular slot 216 is larger than the aperture of the second annular slot 216. The diameter of the air inlet 217; the upper and lower edges of the outer wall of the inner ring 201 are designed with rounded corners 208 to match the fixed cover 204, and the upper and lower edges of the inner wall of the outer ring 202 are also designed with rounded corners 208; the outer walls of the outer ring 202, the middle half ring 205, and the outer half ring 206 are provided with a pair of spliced retaining rings 207, which are fixed to the outer ring 202, the middle half ring 205, and the outer half ring 206 by screws; a pair of fixed covers 204 are fixedly connected to the upper and lower end faces of the inner ring 201 by screws.

[0026] A turbine impeller detection device with the air bearing described above 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 induced 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 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 center of the lower bottom surface of the workbench 1 and is connected to the lower end of the rotating shaft 3, the lower bottom surface of the workbench 1 is provided with a pipe groove 11 connected to the vent 213, an air pipe 12 is provided in the pipe groove 11, one end of the air pipe 12 is connected to the vent 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, and the side wall of the fixed cylinder 5 is evenly provided with at least 6 inlets The air inlet 51 corresponds 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 screwing. The center of the upper cover 6 is provided with an air intake 61, and the air intake 61 is connected to the external air induction system, the external air induction system, the external air supply system, the detection system and the external control system; a fixing ring 31 is provided near the center of the side surface of the rotating shaft 3, and the turbine impeller 4 is sleeved on the upper part of the rotating shaft 3, and the upper part of the rotating shaft 3 is close to the upper part of the rotating shaft 3. A thread is provided near the upper end, and a fixing nut 32 is screwed on, and the fixing nut 32 cooperates with the fixing ring 31 to press and fix the turbine impeller 4; a plurality of fixing rods 52 are provided on the outer wall of the fixing cylinder 5 and are located near the air inlet 51, and a protective plate 53 is provided at one end of the outer side of the plurality of fixing rods 52; a pressure ring 13 is provided 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 to the workbench 1 by screws.

[0027] The detailed connection means are well known in the art. The following mainly introduces the working principle and process, which are as follows:

[0028] According to the instruction manual Figure 1-5It can be seen that when the air bearing 2 of the present invention is working, high-pressure air (or other gas) is provided by an external air supply system. The high-pressure air enters from the vent hole 213, passes through the first-level annular slot 214, the first-level air inlet hole 215, the second-level annular slot 216, and the second-level air inlet hole 217, and enters the first axial channel 218. The second-level air inlet hole 217 is in the center position. Therefore, 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 the pair of fixed covers 204, and flows out from the second axial channel 220 formed between the side surfaces of the pair of fixed covers 204 and the inner side walls of the protruding ring 203 through the radial channel 219. Figure 2-5 The 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 .

[0029] The present invention provides first raised baffles 209 arranged in a circular matrix symmetrically on the outer side wall of the inner ring 201. 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 seen 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 the requirement that when pushed by high-pressure air, the inner ring 201 and the rotating shaft 3 (including the turbine impeller 4) rotate in the same direction. Those skilled in the art can understand that, in addition, second raised baffles 210 arranged in a ring matrix are correspondingly provided on the upper and lower inner side walls of a pair of fixed covers 204, as shown in FIG. Figure 5 As shown, the second raised baffle 210 is inclined radially relative to the fixed cover 204. Operating on the same principle as the first raised baffle 209, the thrust exerted by the high-pressure air on the second raised baffle 210 causes the fixed cover 204 to rotate in the same direction as the rotating shaft 3 (including the turbine impeller 4). Here, the raised height of the first and second raised baffles 209, 210 is sufficient to not interfere with the flow of most of the high-pressure air. The present invention utilizes the design of the first and second raised baffles 209, 210 to assist in the rotation of the rotating shaft 3 and turbine impeller 4, thereby increasing the functionality of the air bearing 2 and reducing the load on the rotating shaft 3 from the external drive, saving energy and improving energy efficiency.

[0030] 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, thereby making the air film formed between the inner ring 201 and the outer ring 202 stable. Even if the high-pressure air entering through the vent hole 213 is unstable, the pressure difference can be dispersed in stages and the position of the first-level air intake hole 215 and the second-level air intake hole 217 can be staggered to reduce the difference in high-pressure air entering through the second-level air intake holes 217 at different positions, thereby ensuring the stability of the air film and achieving a better use effect of the air bearing 2.

[0031] Among them, the upper and lower edges of the outer side wall of the inner ring 201 are designed with rounded corners 208 to cooperate with the fixed cover 204, and the upper and lower edges of the inner side wall of the outer ring 202 are also designed with rounded corners 208. The high-pressure air will flow more smoothly through the inflection point here, reducing resistance.

[0032] Among them, 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. The retaining rings 207 are fixed to the outer ring 202, the middle half ring 205 and the outer half ring 206 by screws, which is convenient for installation and disassembly. At the same time, the retaining rings 207 also have a certain sealing effect.

[0033] A pair of fixing covers 204 are fixedly connected to the upper and lower end surfaces of the inner ring 201 by screws, respectively, for easy installation and removal.

[0034] In the present invention, the sealing of the air bearing 2 is very important, which is common knowledge among those skilled in the art. The present invention can adopt the sealing design of the prior art, which will not be described in detail.

[0035] The turbine impeller 4 inspection device of the present invention utilizes the air bearing 2 of the aforementioned embodiment. Before operation, the turbine impeller 4 inspection device is placed on the workbench 1. The rotating shaft 3, used to mount the turbine impeller 4, is then positioned on the inner ring 201 of the air bearing 2, using an interference fit (no subsequent disassembly is required). The rotating shaft 3 is specifically customized for inspecting the turbine impeller 4 and is not the turbine's rotating shaft 3. Its rigorous and standardized design ensures stability when operating independently. During inspection, it serves as the rotating shaft 3 of the turbine impeller 4, conveying its operating status and facilitating testing. The air vent 213 of the air bearing 2 is connected to the air pipe 12, which extends through the outlet slot 11 and connects to an external air supply system that provides high-pressure air. The inspection system can be positioned at the center of the lower bottom surface of the workbench 1 and connected to the lower end of the rotating shaft 3. This system is used to subsequently inspect the dynamic balance, axial force, and other characteristics of the turbine impeller 4 during operation. The external air supply system is connected to the air intake 61 of the upper cover 6. The external induced air system connection, the external air supply system, the detection system, and the external control system are connected. The external induced air system connection, the external air supply system, the detection system, the external control system, and the connections between them are all based on existing technologies and will not be described in detail in this invention. The above installations are all prepared in advance, and subsequent inspections do not require disassembly, and regular maintenance is sufficient.

[0036] When the turbine impeller 4 detection device is working, the turbine impeller 4 is installed on the upper part of the rotating shaft 3, and the fixing method of the existing technology can be used to ensure that the turbine impeller 4 and the rotating shaft 3 cannot move or rotate relative to each other. Snap the upper cover 6, and the upper cover 6 can be connected to the fixed cylinder 5 through a threaded connection. The external air intake system works, and air is sucked in from the air intake 61 at the center 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, so that the 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 incoming air acts on the turbine impeller 4, causing it to rotate. The instruction manual is attached. Figure 1 The direction of the middle arrow represents the direction of air flow. The faster the air flow rate, the faster the turbine impeller 4 and the rotating shaft 3 rotate. The driving mode of the turbine impeller 4 is highly simulated. 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. 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. The formed air film meets the high-speed rotation requirements, is closer to the actual working state of the turbine impeller 4, and improves the accuracy of detection.

[0037] Among them, a fixing ring 31 is provided near the center of the side surface of the rotating shaft 3, and the turbine impeller 4 is sleeved on the upper part of the rotating shaft 3. A thread is provided near the upper end of the upper part of the rotating shaft 3, and a fixing nut 32 is screwed on it. The fixing nut 32 cooperates with the fixing ring 31 to press and fix the turbine impeller 4. The fixing method is simple and easy to install and disassemble. Whether a key connection is designed here depends on the actual situation, as long as it is ensured that the turbine impeller 4 and the rotating shaft 3 do not move or rotate relative to each other.

[0038] Among them, multiple fixing rods 52 are provided on the outer wall of the fixed cylinder 5 and located near the air inlet 51. A protective plate 53 is provided at one end of the outer side of the multiple 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 safety hazards when people approach.

[0039] Among them, a pressure ring 13 is provided between the upper and lower end faces of the outer ring 202 and the upper and lower surfaces of the workbench 1. The pressure ring 13 fixes the outer ring 202 to the workbench 1 by screws. The fixing method is simple, easy to disassemble and install, and conducive to repair and maintenance.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An air bearing, characterized in that: The invention comprises an inner ring (201), an outer ring (202), a pair of fixing covers (204), a pair of middle layer semi-rings (205) and a pair of outer layer semi-rings (206), wherein the inner diameter of the outer ring (202) is greater than the outer diameter of the inner ring (201), 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 fixing covers (204) are annular and the pair of fixing covers (204) are respectively fixed on the upper and lower end faces of the inner ring (201), the fixing covers (204) and the inner ring (201) are coaxial, the outer diameter of the fixing covers (204) is greater than the inner diameter of the outer ring (202), and the upper and lower end faces of the outer ring (202) and the position close to the edge are axially extended outwards. There is a protruding ring (203), the protruding ring (203) and the outer ring (202) are integrally formed, the inner diameter of the protruding ring (203) is larger than the outer diameter of the fixed cover (204), a first axial channel (218) is formed between the outer wall of the inner ring (201) and the inner wall of the outer ring (202), the outer wall of the inner ring (201) is symmetrically provided with first protruding baffles (209) arranged in a ring matrix, the first protruding baffles (209) are inclined to the axial direction 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 shaft (3), the upper and lower end faces of the outer ring (202) and the inner wall of a pair of fixed covers (204) are connected. A radial channel (219) is formed, and the inner side walls of a pair of fixed covers (204) are provided with second raised baffles (210) arranged in a ring matrix, and the second raised baffles (210) are inclined to the radial direction of the fixed cover (204). The thrust of the high-pressure air on the second raised baffles (210) can make the fixed cover (204) rotate, and the rotation direction is the same as the rotation direction of the 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 protruding ring (203). A circle of middle-layer annular groove (211) is provided at the center position of the outer side wall of the outer ring (202). A pair of middle-layer half rings (205) can be assembled into a complete ring and the size matches the size of the middle-layer annular groove (211). A pair of middle-layer The half rings (205) are spliced and arranged in the middle ring groove (211); the outer side walls of a pair of middle half rings (205) are provided with an outer ring groove (212) at the center position; the pair of outer half rings (206) can be spliced into a complete ring and the size matches the size of the outer ring groove (212); the pair of outer half rings (206) are spliced and arranged in the outer ring groove (212); the side walls of the pair of outer half rings (206) are provided with a through vent hole (213) at the center position radially; a first-level annular slot (214) is provided between the inner side walls of the pair of outer half rings (206) and the outer side walls of the pair of middle half rings (205); and the side walls of the pair of middle half rings (205) are provided with at least 6 through-level air inlet holes (215) at the center position radially.A secondary annular slot (216) is provided between the inner side wall of a pair of middle layer semi-rings (205) and the outer side wall of the outer ring (202), and at least 6 through secondary air inlet holes (217) are radially provided at the center position of the side wall of the outer ring (202), and the primary air inlet holes (215) and the secondary air inlet holes (217) are arranged in an annular matrix and the positions of the primary air inlet holes (215) and the secondary air inlet holes (217) are staggered with each other, and the ventilation holes (213), the primary annular slot (214), the primary air inlet holes (215), the secondary annular slot (215), the secondary annular slot (214), the primary air inlet holes (215), the secondary annular slot (214 ... The slot (216), the secondary air inlet (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 (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), and the aperture of the secondary annular slot (216) is larger than the aperture of the secondary air inlet (217).

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

3. The air bearing according to claim 1, wherein: 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). The retaining rings (207) are fixed to the outer ring (202), the middle half ring (205) and the outer half ring (206) by screws.

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

5. A turbine impeller detection device having the air bearing according to claim 1, characterized in that: The invention comprises a workbench (1), a rotating shaft (3) for installing a turbine impeller (4), a fixing cylinder (5), an upper cover (6), a detection system, an external control system, an external air induction system and an external air supply system, wherein 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) 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 center of the lower bottom surface of the workbench (1) and is connected to the lower end of the rotating shaft (3), and the lower bottom surface of the workbench (1) is provided with a pipe groove (11) connected to the vent hole (213) An air pipe (12) is provided in the pipe groove (11), one end of the air pipe (12) is connected to the vent hole (213), and the other end of the air pipe (12) is connected to the external air supply system. The fixed cylinder (5) is provided on the upper surface of the workbench (1) and is coaxial with the rotating shaft (3). At least 6 air inlets (51) are evenly provided 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 screwing. An air intake (61) is provided at the center of the upper cover (6), and the air intake (61) is connected to the external air induced system, the external air induced system, the external air supply system, the detection system and the external control system.

6. The turbine impeller detection device according to claim 5, characterized in that: A fixing ring (31) is provided near the center of the side surface of the rotating shaft (3); the turbine impeller (4) is sleeved on the upper portion of the rotating shaft (3); a thread is provided near the upper end of the upper portion 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 provided on the outer side wall of the fixing cylinder (5) and located near the air inlet (51), and a protective plate (53) is provided at one end of the outer side 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 provided between the upper and lower end surfaces 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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