High-bearing dynamic and static pressure mixed gas radial bearing

Abstract

The utility model discloses a high-bearing dynamic and static pressure mixed gas radial bearing, and relates to the technical field of gas bearings. The utility model aims to solve the problems in the prior art that a gas supply pipe is fixed at a gas supply hole in the back surface of a top foil in a welding manner, the welding manner is poor in mounting precision, and thermal deformation of the top foil is caused by welding energy. The device comprises a top foil, a corrugated foil, a bearing sleeve and an air supply pipe, the corrugated foil pieces are arranged close to the inner wall of the bearing sleeve, the corrugated foil pieces define a first ring closed in the circumferential direction, the top foil pieces define a second ring closed in the circumferential direction, the first ring is arranged between the inner wall of the bearing sleeve and the second ring, and the air supply pipe sequentially penetrates through the bearing sleeve and the corrugated foil pieces to be connected with the top foil pieces. The utility model is used for the gas bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of gas bearings, in particular to a high-load dynamic and static pressure mixed gas radial bearing. Background Art

[0002] Gas bearings use gas lubrication to generate an air film between the rotor and the bearing, thereby achieving low friction, low noise, and high-speed operation of the rotor. At present, gas bearings have been widely used in many industrial products such as micro gas turbines, aeration fans, and air compressors. Gas bearings are divided into hydrodynamic bearings and hydrostatic bearings according to the way their load-bearing capacity is generated. Hydrodynamic gas bearings do not require external air supply, and the rotor is suspended by the dynamic pressure effect generated when the rotor rotates at high speed; hydrostatic gas bearings use external air supply to deliver high-pressure gas between the top foil of the bearing and the rotor, thereby generating an air film and suspending the rotor. The small load-bearing capacity of hydrodynamic gas bearings limits the wider application of gas bearings. By combining gas hydrodynamic bearings with gas hydrostatic bearings to form a hydrodynamic and hydrostatic hybrid gas bearing, the problem of low load-bearing capacity of hydrodynamic gas bearings can be well compensated.

[0003] In traditional dynamic and static pressure mixed gas radial bearings, the gas supply pipe is fixed to the gas supply hole on the back of the top foil by welding. This welding method not only has poor installation accuracy and causes thermal deformation of the top foil due to the welding energy, but also fatigue of the welding joint between the top foil and the gas supply pipe will occur when the bearing works for a long time, increasing the risk of gas leakage or gas supply pipe falling off. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that in the traditional dynamic and static pressure mixed gas radial bearing in the prior art, the air supply pipe is fixed to the air supply hole on the back of the top foil by welding. This welding method not only has poor installation accuracy and the welding energy causes thermal deformation of the top foil, but also the long-term operation of the bearing will cause fatigue at the welding point between the top foil and the air supply pipe, thereby providing a high-load dynamic and static pressure mixed gas radial bearing.

[0005] The utility model adopts the following technical solution to solve the above-mentioned problems: a high-load dynamic and static pressure mixed gas radial bearing, comprising a top foil, a corrugated foil, a bearing sleeve and an air supply pipe; the corrugated foil is arranged close to the inner wall of the bearing sleeve, the corrugated foil is enclosed to form a circumferentially closed first ring, the top foil is enclosed to form a circumferentially closed second ring, the first ring is arranged between the inner wall of the bearing sleeve and the second ring, the air supply pipe passes through the bearing sleeve and the corrugated foil in sequence and is connected to the top foil, the inner side wall of the top foil is provided with a wear-resistant coating, both ends of the air supply pipe are provided with threads, and the length of the top foil and the corrugated foil is less than the length of the bearing sleeve.

[0006] Furthermore, the inner wall of the bearing sleeve is evenly provided with a plurality of straight grooves in the axial direction, and the two ends of the corrugated foil are respectively provided with bending parts, and the bending parts of two adjacent corrugated foils are spliced ​​and installed in one straight groove.

[0007] Furthermore, a bearing end cover is installed at one end of the bearing sleeve, a bearing sleeve fixing groove is provided at the other end of the bearing sleeve, a bearing end cover fixing groove is provided on the bearing end cover, and fixing blocks are respectively provided at both radial ends of the top foil, one fixing block is installed in the bearing sleeve fixing groove, and the other fixing block is installed in the bearing end cover fixing groove.

[0008] Furthermore, a plurality of top foil air supply holes are provided on the top foil, and the ends of the air supply pipes are connected to the top foil air supply holes via threads.

[0009] Furthermore, the diameter of the air supply hole of the top foil is 0.01mm-10mm.

[0010] Furthermore, the number of the air supply holes of the top foil is 1-20.

[0011] Furthermore, the number of the corrugated foil sheets is 1-10 sheets, and the number of the top foil sheet is 1 sheet.

[0012] Furthermore, the corrugated foil is provided with a plurality of waves connected in sequence along the radial direction.

[0013] The utility model has the following beneficial technical effects:

[0014] Compared with the traditional welded dynamic and static pressure mixed radial gas bearing, the high-load dynamic and static pressure mixed gas radial bearing of the utility model has an internal thread structure at the air supply hole of the outer ring of the top foil, and an external thread on the air supply pipe. The top foil and the air supply pipe are connected by threads, which increases the installation efficiency of the bearing assembly, improves the installation accuracy and strength of the air supply pipe, and improves the service life and reliability of the dynamic and static pressure mixed gas bearing.

[0015] The inner side wall of the top foil used in the utility model is provided with a molybdenum disulfide layer or a polytetrafluoroethylene coating wear-resistant coating, which effectively reduces wear and improves the service life of the top foil. The top foil of the utility model is provided with fixing blocks at both radial ends, one fixing block is installed in the bearing sleeve fixing groove, and the other fixing block is installed in the bearing end cover fixing groove, which optimizes the processing procedures of the top foil and facilitates assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 is a schematic diagram of a corrugated foil with air supply holes;

[0018] Figure 3 It is a radial bearing sleeve with air supply holes;

[0019] Figure 4 is a cross-sectional view of a threaded air supply pipe;

[0020] Figure 5 It is a cross-sectional view of the connection between the air supply pipe with external threads and the top foil with internal threads on the top foil;

[0021] Figure 6 It is a schematic diagram of the structure of the radial bearing end cover;

[0022] Figure 7 This is a detail picture of the top foil;

[0023] Figure 8 It is a cross-sectional view of the air supply hole of the internal thread on the top foil;

[0024] Fig. 9 It is a connection diagram of the air supply pipe with external threads and the air supply hole with internal threads on the top foil;

[0025] Fig.10 is a schematic diagram of the air supply pipe passing through the air supply hole of the corrugated foil;

[0026] Fig.11 It is a schematic diagram of the top foil fixing block and the radial bearing sleeve fixing groove after assembly;

[0027] Fig.12 It is a schematic diagram of the top foil fixing block and the bearing end cover fixing groove after assembly;

[0028] In the figure, 1, bearing end cover; 2, bearing end cover fixing groove; 3, top foil; 4, top foil air supply hole; 5, fixing block; 6, corrugated foil; 601, bending part; 7, corrugated foil air supply hole; 8, bearing sleeve; 801, straight groove; 9, air supply pipe; 11, hole; 12, bearing sleeve fixing groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments of the specification. The specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] Specific embodiment 1: Combination Figures 1 to 12 To illustrate the present embodiment, a high load-bearing dynamic and static pressure mixed gas radial bearing is composed of a corrugated foil 6 with a corrugated foil air supply hole 7 or a corrugated foil 6 with a corrugated foil air supply groove 13, a bearing sleeve 8 with a hole 11 or a bearing sleeve 8 with a groove 10, a bearing end cover 1, a top foil 3 with an internally threaded top foil air supply hole 4 and a threaded air supply pipe 9.

[0031] In a preferred embodiment, in the high-load dynamic and static pressure mixed gas radial bearing, the thickness of the top foil 3 is 0.1 mm-5 mm, and the top foil 3 is connected and fixed to the air supply pipe 9 by threads.

[0032] In a preferred embodiment, when assembling the high-load dynamic and static pressure mixed gas radial bearing, the outer ring of the corrugated foil 6 is first fitted with the inner ring of the bearing sleeve 8, and then the outer ring of the top foil 3 is fitted with the inner ring of the corrugated foil 6, and finally the bearing end cover 1 is fixed to the edge of the bearing sleeve 8 by screws.

[0033] In a preferred embodiment, the high-load dynamic and static pressure mixed gas radial bearing is characterized in that the number of the corrugated foils 6 is 1-10, and the number of the top foil 3 is 1.

[0034] In a preferred embodiment, the high-load dynamic and static pressure mixed gas radial bearing has one, two, three or four rows of threaded top foil air supply holes 4 on the top foil 3 in the length direction of the bearing.

[0035] In a preferred embodiment, the number of the threaded top foil air supply holes 4 on the top foil 3 of the high-load dynamic and static pressure mixed gas radial bearing along the circumferential direction of the bearing is 1-20.

[0036] In a preferred embodiment, the diameter of the air supply pipe 9 of the dynamic and static pressure mixed gas radial bearing is smaller than the diameter of the corrugated foil air supply hole 7 or the corrugated foil air supply groove 12 on the corrugated foil 6, and smaller than the diameter of the hole 11 or the groove 10 on the bearing sleeve 8. The number of the top foil air supply hole 4 on the top foil 3, the corrugated foil air supply hole 7 on the corrugated foil 6, and the hole 11 on the bearing sleeve 8 is the same, and is consistent with the number of the air supply pipe 9.

[0037] In a preferred embodiment, in the high-load dynamic and static pressure mixed gas radial bearing, the inner diameter of the top foil 3 is smaller than the inner diameter of the bearing end cover 1 .

[0038] In a preferred embodiment, the diameter of the top foil air supply hole 4 on the top foil 3 of the high load dynamic and static pressure mixed gas radial bearing is 0.01mm-10mm, and the material of the threaded air supply pipe 9 is stainless steel, copper, polytetrafluoroethylene, aluminum and other metal or non-metal materials. The material of the top foil 3 is stainless steel, nickel-based alloy, copper, aluminum, graphite, polytetrafluoroethylene and other metal or non-metal materials.

[0039] In a preferred embodiment, in the high-load dynamic and static pressure mixed gas radial bearing, the length of the top foil 3 and the corrugated foil 6 is less than the length of the bearing sleeve 8. After assembly, the fixing blocks 5 at both ends of the top foil 3 are respectively inserted into the bearing sleeve fixing groove 12 on the bearing sleeve 8 and the bearing end cover fixing groove 2 on the bearing end cover 1.

[0040] In a preferred embodiment, in the high-load dynamic and static pressure mixed gas radial bearing, high-pressure gas reaches between the top foil 3 of the bearing and the rotor through a threaded air supply pipe 9 to form an air film between the top foil 3 of the bearing and the rotor, and the air supply pressure is 0MPa-22MPa.

[0041] Specific embodiment 2: Combination Figure 1 To illustrate this embodiment, Figure 1 The assembly diagram of a high-load dynamic and static pressure mixed gas radial bearing includes a bearing end cover 1, a top foil 3 with a threaded top foil air supply hole 4, a corrugated foil 6 with a corrugated foil air supply hole 7, a radial bearing sleeve 8 with a hole 11 and a threaded air supply pipe 9. The assembly sequence is to first place the corrugated foil 6 into the radial bearing sleeve 8 so that the outer ring of the corrugated foil 6 fits with the inner ring of the radial bearing sleeve 8; the second step is to place the top foil 3 into the radial bearing sleeve 8 so that the outer ring of the top foil 3 fits with the inner ring of the corrugated foil 6; the third step is to pass the threaded air supply pipe 9 through the hole 11 on the radial bearing sleeve 4 and the corrugated foil air supply hole 7 on the corrugated foil 6, and connect it with the thread at the top foil air supply hole 4 on the top foil 3 to achieve the connection and fixation of the air supply pipe 9 and the top foil 3; finally, fix the bearing end cover 1 and the radial bearing sleeve 8 to the edge of the bearing sleeve by screws; at this time, the fixing block 5 of the top foil 3 has been inserted into the bearing end cover fixing groove 2 of the bearing end cover 1 and the bearing sleeve fixing groove 12 of the radial bearing sleeve 8.

[0042] The other components and connection relationships are the same as those in the first specific embodiment.

[0043] Specific embodiment three: Combination Figures 1 to 12 To illustrate the present embodiment, a high-load dynamic and static pressure mixed gas radial bearing comprises a top foil 3, a corrugated foil 6, a bearing sleeve 8 and an air supply pipe 9; the corrugated foil 6 is arranged close to the inner wall of the bearing sleeve 8, the corrugated foil 6 encloses a circumferentially closed first ring, the top foil 3 encloses a circumferentially closed second ring, the first ring is arranged between the inner wall of the bearing sleeve 8 and the second ring, the air supply pipe 9 passes through the bearing sleeve 8 and the corrugated foil 6 in sequence and is connected to the top foil 3, the bearing sleeve 8 is provided with a hole 11, and the corrugated foil 6 is provided with a corrugated foil air supply hole 7.

[0044] In a preferred embodiment, the inner wall of the bearing sleeve 8 is evenly provided with a plurality of straight grooves 801 axially, and the two circumferential ends of the corrugated foil 6 are respectively provided with bending portions 601 , and the bending portions 601 of two adjacent corrugated foils 6 are spliced ​​and installed in one straight groove 801 .

[0045] In a preferred embodiment, a bearing cover 1 is further installed at one end of the bearing sleeve 8, a bearing sleeve fixing groove 12 is provided at the other end of the bearing sleeve 8, a bearing cover fixing groove 2 is provided on the bearing cover 1, and fixing blocks 5 are respectively provided at both radial ends of the top foil 3, one fixing block 5 is installed in the bearing sleeve fixing groove 12, and the other fixing block 5 is installed in the bearing cover fixing groove 2. Preferably, in order to reduce wear and increase the service life of the top foil 3, a wear-resistant coating is provided on the inner side wall of the top foil 3, and the wear-resistant coating can be a molybdenum disulfide layer or a polytetrafluoroethylene coating, and the thickness can be selected as needed.

[0046] In a preferred embodiment, a plurality of top foil air supply holes 4 are provided on the top foil 3 , and the ends of the air supply pipes 9 are connected to the top foil air supply holes 4 via threads.

[0047] In a preferred embodiment, the diameter of the top foil air supply hole 4 is 0.01 mm-10 mm.

[0048] In a preferred embodiment, the number of the top foil air supply holes 4 is 1-20. For the high-load dynamic and static pressure mixed gas radial bearing, the number of rows of the threaded top foil air supply holes 4 on the top foil 3 is 1 row, 2 rows, 3 rows or 4 rows in the axial length direction of the bearing. Preferably, two rows of top foil air supply holes 4 are set on the top foil 3 along the axial length direction according to the load-bearing capacity, and each row is evenly provided with 4 top foil air supply holes 4. Eight air supply pipes 9 are used to supply air to the gas radial bearing, and the air supply pipes 9 are connected to the gas main pipe, and the gas main pipe is connected to the high-pressure gas station.

[0049] In a preferred embodiment, the thickness of the top foil 3 is 0.1 mm-5 mm.

[0050] In a preferred embodiment, the number of the corrugated foils 6 is 1-10, and the number of the top foil 3 is 1.

[0051] In a preferred embodiment, the groove 10 is arranged corresponding to the corrugated foil air supply groove 13, and the hole 11 is arranged corresponding to the corrugated foil air supply hole 7.

[0052] The other components and connection relationships are the same as those in the first specific embodiment.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high load dynamic and static pressure mixed gas radial bearing, characterized in that: It comprises a top foil (3), a corrugated foil (6), a bearing sleeve (8) and an air supply pipe (9); The corrugated foil (6) is arranged close to the inner wall of the bearing sleeve (8), the corrugated foil (6) encloses a first circumferentially closed ring, the top foil (3) encloses a second circumferentially closed ring, the first ring is arranged between the inner wall of the bearing sleeve (8) and the second ring, the air supply pipe (9) passes through the bearing sleeve (8) and the corrugated foil (6) in sequence and is connected to the top foil (3), the inner side wall of the top foil (3) is provided with a wear-resistant coating, both ends of the air supply pipe (9) are provided with threads, and the length of the top foil (3) and the corrugated foil (6) is less than the length of the bearing sleeve (8).

2. The high load dynamic and static pressure mixed gas radial bearing according to claim 1, characterized in that: The inner wall of the bearing sleeve (8) is evenly provided with a plurality of straight grooves (801) in the axial direction, and the two circumferential ends of the corrugated foil (6) are respectively provided with bending portions (601), and the bending portions (601) of two adjacent corrugated foils (6) are spliced ​​and installed in one straight groove (801).

3. The high load dynamic and static pressure mixed gas radial bearing according to claim 1, characterized in that: A bearing end cover (1) is also installed at one end of the bearing sleeve (8), a bearing sleeve fixing groove (12) is provided at the other end of the bearing sleeve (8), a bearing end cover fixing groove (2) is provided on the bearing end cover (1), and fixing blocks (5) are respectively provided at both radial ends of the top foil (3), one fixing block (5) is installed in the bearing sleeve fixing groove (12), and the other fixing block (5) is installed in the bearing end cover fixing groove (2).

4. The high load dynamic and static pressure mixed gas radial bearing according to claim 1, characterized in that: The top foil (3) is provided with a plurality of top foil air supply holes (4), and the ends of the air supply pipes (9) are connected to the top foil air supply holes (4) via threads.

5. The high load dynamic and static pressure mixed gas radial bearing according to claim 4, characterized in that: The diameter of the air supply hole (4) of the top foil is 0.01 mm-10 mm.

6. The high load dynamic and static pressure mixed gas radial bearing according to claim 4, characterized in that: The number of the top foil air supply holes (4) is 1-20.

7. The high load dynamic and static pressure mixed gas radial bearing according to claim 1, characterized in that: The number of the corrugated foil sheets (6) is 1-10 sheets, and the number of the top foil sheet (3) is 1 sheet.

8. The high load dynamic and static pressure mixed gas radial bearing according to claim 1, characterized in that: The corrugated foil (6) is provided with a plurality of waves connected in sequence along the radial direction.

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