Aerostatic bearing with elastic support elements

Abstract

The utility model relates to the field of static pressure gas bearing, more specifically to a static pressure bearing with elastic support. A static pressure bearing with elastic support, including bearing sleeve, bearing bush, sealing ring and elastic support element, the bearing bush is cylindrical shape, bearing bush installs in the inside of bearing sleeve, and the outer circumferential surface of bearing bush both ends is provided with sealing ring groove for installing sealing ring, and the middle position is provided with groove for installing elastic support element, or, the sealing ring groove of installing sealing ring and the groove of installing elastic support element are provided in the inner circumferential surface of bearing sleeve. The gap is arranged between the bearing bush and bearing sleeve, and the sealing ring and elastic support element are in contact with the bearing bush and bearing sleeve and provide elastic support and damping effect. Provide good elasticity and damping effect, improve the stability of shafting operation, provide greater carrying capacity, reduce the machining and assembly precision requirement of bearing assembly.

Description

Technical Field

[0001] This utility model relates to the field of hydrostatic air bearings, and more specifically, to a gas hydrostatic bearing with an elastic support element. It incorporates technology related to gas-elastic coupling. Background Technology

[0002] Gas lubrication technology is commonly used in ultra-high-speed equipment applications. Gas lubrication technology includes two types: hydrostatic gas bearings and dynamic gas bearings. Hydrostatic gas bearings are commonly used in high-precision applications. Hydrostatic gas bearings use externally introduced high-pressure gas, which is introduced to the bearing working surface through a throttling structure to achieve load-bearing. However, the gap between the inner surface of the bearing and the shaft is typically only 10-30 μm, and contact is absolutely prohibited during operation. Therefore, hydrostatic bearing equipment usually requires extremely high precision in the machining and assembly of bearing components. Furthermore, because the components are all rigid bodies, the system damping is very small, and due to the extremely low viscosity of the gas, the damping generated by the gas film is also very small, sometimes leading to self-excited vibration of the shaft system due to gas hammer. Dynamic gas bearings, on the other hand, do not require an external high-pressure gas source, but are composed of elastic support elements, and their gas film clearance is much larger than that of hydrostatic bearings. Therefore, the displacement range of the shaft system within the bearing is larger, making them only suitable for equipment with low radial positioning accuracy, such as energy and power equipment. Utility Model Content

[0003] This utility model discloses a gas hydrostatic bearing with elastic support elements, which provides good elasticity and damping effects, improves the stability of shaft operation, provides greater load-bearing capacity, and reduces the precision requirements for bearing assembly processing.

[0004] To achieve the above objectives, the technical means adopted by this utility model are as follows:

[0005] A gas hydrostatic bearing with an elastic support element includes a bearing sleeve, a bearing bush, a sealing ring, and an elastic support element, wherein the bearing bush is cylindrical and is installed inside the bearing sleeve.

[0006] A clearance is provided between the bearing bush and the bearing sleeve; a sealing ring and an elastic support element are provided between the bearing bush and the bearing sleeve, and the sealing ring and the elastic support element are in contact with the bearing bush and the bearing sleeve and provide elastic support and damping.

[0007] The outer circumferential surfaces at both ends of the bearing bush are provided with sealing ring grooves for installing sealing rings, and the middle position is provided with an elastic support element groove for installing elastic support elements.

[0008] Alternatively, the sealing ring groove for installing the sealing ring and the elastic support element groove for installing the elastic support element are formed on the inner circumferential surface of the bearing sleeve.

[0009] The sum of the depth of the sealing ring groove and the clearance is equal to the standard groove depth for installing the corresponding sealing ring; the sum of the depth of the elastic support element groove and the clearance is equal to the height of the installed elastic support element.

[0010] The bearing sleeve has an air inlet channel, through which high-pressure gas introduced from the outside is introduced into the movable gap between the bearing sleeve and the bearing bush, and flows through the throttling element hole to the inner surface of the bearing bush and the rotating shaft, providing a static pressure air flotation effect;

[0011] The sealing ring is located on the gas transmission path between the intake channel and the throttling element hole. It is used to seal the movable gap between the bearing sleeve and the bearing bush, so that the gas in the intake channel flows to the throttling element hole after being sealed.

[0012] The bearing bush has multiple throttling holes on its circumferential surface. Each throttling hole is evenly distributed along the circumferential direction and symmetrically arranged on both sides along the axial direction. In this case, the throttling element hole is a throttling hole.

[0013] Alternatively, multiple small-hole or micro-hole throttling devices are installed on the circumferential surface of the bearing bush, in which case the throttling element holes are through holes on the small-hole or micro-hole throttling devices.

[0014] The bearing bush has multiple radial holes on its circumferential surface. Each radial hole is a two-stage stepped hole with a decreasing diameter from the outside to the inside. The throttling element hole is also a two-stage stepped hole.

[0015] The bearing bush is an assembly consisting of two cylindrical layers, an inner and an outer layer. The inner cylindrical layer uses a porous material throttling device, which provides a throttling effect through the voids in the porous material itself. The throttling element hole is the void in the porous material itself. The outer cylindrical layer is made of metal. The metal outer cylindrical layer is in contact with the sealing ring and the elastic support element. An air supply channel is opened on the metal outer cylindrical layer. The air inlet channel and the air supply channel are connected through the air supply port.

[0016] A metal gasket is installed between the elastic support element and the bearing bush, and a metal gasket is installed between the elastic support element and the bearing sleeve.

[0017] The throttling element hole is arranged at the axial center of the bearing bush, and the elastic support element is arranged on both sides of the air supply channel of the throttling element hole.

[0018] If a porous material throttle is used, the air inlet of the porous material throttle is located at the axial center of the bearing, and the elastic support elements are arranged on both sides of the air inlet of the porous material throttle.

[0019] Alternatively, at least three rows of throttling element holes are provided along the axial direction, with elastic support elements arranged between adjacent rows of throttling element holes.

[0020] The elastic support element is a corrugated foil, a wire mesh, or a metal rubber.

[0021] The elastic support element is a helical spring. Multiple semi-circular grooves are uniformly arranged in an axial ring on both the bearing sleeve and the bearing bush. The opposing semi-circular grooves on the bearing sleeve and the bearing bush form a circular groove, and the multiple helical springs are respectively arranged in the multiple circular grooves.

[0022] The beneficial effects of this utility model are:

[0023] This allows the bearing to have a certain range of motion, reduces the precision requirements for the machining and assembly of the bearing assembly, and increases the bearing's adaptability; it also gives the bearing elastic support, improving its resistance to interference and impact; and it increases the damping of the bearing assembly, enhancing the rotor's operational stability. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0025] Figure 1 This is a schematic diagram of a gas hydrostatic bearing with an elastic support element;

[0026] Figure 2 A schematic diagram of a structure for installing a throttle device on a bearing bush;

[0027] Figure 3 A schematic diagram of a porous material throttling device installed on a bearing bush;

[0028] Figure 4 This is a schematic diagram of the installation of the elastic support element (corrugated foil);

[0029] Figure 5 Schematic diagram of the structure in which the sealing ring groove and the elastic support element groove are formed on the inner circumferential surface of the bearing sleeve. Figure 1 ;

[0030] Figure 6 This is a schematic diagram of the structure where the sealing ring groove and the elastic support element groove are formed on the inner circumferential surface of the bearing sleeve. Figure 2 ;

[0031] Figure 7 This is a schematic diagram of the structure where the sealing ring groove and the elastic support element groove are formed on the inner circumferential surface of the bearing sleeve. Figure 3 ;

[0032] Figure 8 A schematic diagram showing the structure for adding metal gaskets between the corrugated foil and the bearing sleeve, and between the corrugated foil and the bearing bush;

[0033] Figure 9 A schematic diagram showing a structure with the throttle orifice positioned at the axial center and elastic support elements arranged on both sides of the throttle orifice;

[0034] Figure 10A schematic diagram showing the structure with the throttle positioned at the axial center and elastic support elements arranged on both sides of the throttle;

[0035] Figure 11 A schematic diagram showing the structure of a porous material throttling device with its air inlet located at the axial center of the bearing and elastic support elements arranged on both sides of the air inlet.

[0036] Figure 12 A schematic diagram of a structure with multiple rows of throttling orifices arranged along the axial direction and elastic support elements arranged between the throttling orifices;

[0037] Figure 13 A schematic diagram of a structure with multiple rows of throttles arranged along the axial direction and elastic support elements arranged between the throttles;

[0038] Figure 14 A schematic diagram of a structure in which the elastic support element is a helical spring arranged along the axial direction. Figure 1 ;

[0039] Figure 15 A schematic diagram of a structure in which the elastic support element is a helical spring arranged along the axial direction. Figure 2 ;

[0040] Figure 16 A schematic diagram of a structure in which the elastic support element is a helical spring arranged along the axial direction. Figure 3 ;

[0041] Figure 17 Schematic diagram of an embodiment of a hybrid support for a gas hydrostatic bearing and a flexible foil gas hydrodynamic bearing Figure 1 ;

[0042] Figure 18 Schematic diagram of an embodiment of a hybrid support for a gas hydrostatic bearing and a flexible foil gas hydrodynamic bearing Figure 2 ;

[0043] In the diagram: 1. Bearing sleeve; 2. Bearing shell; 3. Sealing ring; 4. Elastic support element; 5. Movement clearance; 6. Air intake channel; 7. Metal gasket; 8. Throttling orifice; 9. Air supply channel; 10. Air supply port; 11. Porous material throttling device; 12. Helical spring; 13. Top foil; 14. Detailed Implementation

[0044] A gas hydrostatic bearing with an elastic support element includes a bearing sleeve 1, a bearing shell 2, a sealing ring 3, and an elastic support element 4. The bearing shell 2 is cylindrical and is installed inside the bearing sleeve 1.

[0045] A movable clearance 5 is provided between the bearing bush 2 and the bearing sleeve 1; a sealing ring 3 and an elastic support element 4 are provided between the bearing bush 2 and the bearing sleeve 1. The sealing ring 3 and the elastic support element 4 are in contact with the bearing bush 2 and the bearing sleeve 1 and provide elastic support and damping.

[0046] The outer diameter of the bearing bush 2 is slightly smaller than the inner diameter of the bearing sleeve 1, allowing for a certain clearance 5 after assembly. This clearance 5 ranges from approximately 0.1 to 0.5 mm, thus providing the bearing bush 2 with a certain displacement range. The elastic support element 4 has a certain stiffness and damping. The bearing bush 2 does not directly contact the bearing sleeve 1, but both the sealing ring 3 and the elastic support element 4 are in contact with both the bearing bush 2 and the bearing sleeve 1, providing elastic support and damping effects.

[0047] The embodiments shown in this utility model employ corrugated foil, such as... Figure 4 As shown, this is a support element commonly used in hydrodynamic gas bearings. It has greater stiffness than rubber and can generate Coulomb friction damping when the bearing bush 2 undergoes minute displacement. The corrugated foil not only provides elastic support, but also, when the bearing bush 2 undergoes minute displacement, the micro-deformation of the corrugated foil leads to micro-slippage, which can bring about Coulomb friction damping. This damping is beneficial to improving the stability of the shaft system operation.

[0048] In addition to corrugated foil, the elastic support element 4 involved in this utility model can also be other elastic support structures, such as springs, metal wire mesh foils, and metal rubber.

[0049] The outer circumferential surfaces at both ends of the bearing bush 2 are provided with sealing ring grooves for installing sealing rings 3, and the middle position is provided with an elastic support element groove for installing an elastic support element 4; such as Figure 1-3 As shown.

[0050] Alternatively, the sealing ring groove for mounting the sealing ring 3 and the elastic support element groove for mounting the elastic support element 4 are formed on the inner circumferential surface of the bearing sleeve 1; for example Figure 5-7 As shown.

[0051] In short, as long as the sealing ring 3 and the elastic support element 4 are installed between the bearing bush 2 and the bearing sleeve 1, it is sufficient.

[0052] The sum of the depth of the sealing ring groove and the movable clearance 5 is equal to the standard groove depth for installing the corresponding sealing ring 3; the sum of the depth of the elastic support element groove and the movable clearance 5 is equal to the height of the installed elastic support element 4.

[0053] The bearing sleeve 1 has an air inlet channel 6, through which high-pressure gas introduced from the outside is introduced into the movable gap 5 between the bearing sleeve 1 and the bearing bush 2, and flows through the throttling element hole to the inner surface of the bearing bush 2 and the rotating shaft, providing static pressure air flotation effect;

[0054] The sealing ring 3 is located on the gas transmission path between the intake channel 6 and the throttling element hole. It is used to seal the movable gap 5 between the bearing sleeve 1 and the bearing bush 2, so that the gas in the intake channel 6 flows to the throttling element hole after being sealed.

[0055] The bearing bush 2 has multiple throttling holes 8 on its circumferential surface. These holes 8 are evenly distributed along the circumferential direction and symmetrically arranged on both sides along the axial direction. In this case, the throttling element hole is the throttling hole 8. Figure 1 , 5 As shown in 9, 12, and 14.

[0056] Alternatively, multiple small-hole orifice throttling devices 9 or micro-hole throttling devices 9 are installed on the circumferential surface of the bearing bush 2. In this case, the throttling element orifice is a through hole on the small-hole orifice throttling device 9 or micro-hole throttling device 9, and the diameter of the throttling element orifice on the small-hole throttling device 9 or micro-hole throttling device 9 ranges from 0.02 mm to 0.5 mm. For example... Figure 2 , 6 As shown in 10, 13, and 15.

[0057] The bearing bush 2 has multiple radial holes on its circumferential surface. Each radial hole is a two-stage stepped hole with a decreasing diameter from the outside to the inside. The throttling element hole is a two-stage stepped hole. The diameter of the throttling orifice or micro-orifice inside the two-stage stepped hole ranges from 0.02 mm to 0.5 mm.

[0058] The bearing bush 2 is an assembly consisting of two cylindrical layers, an inner and an outer layer. The inner cylindrical layer uses a porous material throttling device 12, which provides a throttling effect through the voids in the porous material itself. The throttling element orifice is the void in the porous material itself. The outer cylindrical layer is made of metal, and the metal outer cylindrical layer contacts the sealing ring 3 and the elastic support element 4. An air supply channel 10 is provided on the metal outer cylindrical layer, and the air inlet channel 6 is connected to the air supply channel 10 through the air supply port 11. Figure 3 , 7 As shown in 11 and 16.

[0059] A metal gasket 7 is installed between the elastic support element 4 and the bearing bush 2, and a metal gasket 7 is installed between the elastic support element 4 and the bearing sleeve 1.

[0060] On the one hand, it serves to adjust the clearance 5; on the other hand, the bearing bush 2 is usually made of bronze, and the Coulomb friction caused by the corrugated foil may cause wear to the bronze material. To avoid this wear, a metal shim 7 can be installed between the bearing bush 2 and the elastic support element. The shim also serves to adjust the clearance 5. Adding a shim between the bearing sleeve 1 and the corrugated foil allows the shim to wrap around the corrugated foil during assembly, making the assembly process smoother. Figure 8 As shown.

[0061] The throttling element hole is located at the axial center of the bearing bush 2, and the elastic support element 4 is correspondingly arranged on both sides of the air supply channel 10 of the throttling element hole; for example Figure 9-10 As shown.

[0062] If a porous material throttle 12 is used, the air inlet 11 of the porous material throttle 12 is arranged at the axial center of the bearing 2, and the elastic support element 4 is arranged on both sides of the air inlet 11 of the porous material throttle 12; Figure 11 As shown.

[0063] Alternatively, at least three rows of throttling element holes are provided along the axial direction, with elastic support elements 4 arranged between adjacent rows of throttling element holes. For example... Figure 12-13 As shown.

[0064] The elastic support element 4 is a helical spring 13. Multiple semi-circular grooves are uniformly arranged in an annular pattern on both the bearing sleeve 1 and the bearing bush 2 in the axial direction. The opposing semi-circular grooves on the bearing sleeve 1 and the bearing bush 2 form a circular groove, and the multiple helical springs 13 are respectively disposed within the multiple circular grooves. Figure 14-16 As shown.

[0065] like Figure 17 As shown in the figure, this is an embodiment of a hybrid support system using a gas static bearing and a flexible foil gas dynamic bearing. The gas static bearing and the flexible foil gas dynamic bearing are placed side-by-side along the axis of the bearing sleeve 1, with the gas static bearing located at one end inside the bearing sleeve 1 and the flexible foil gas dynamic bearing at the other end. The flexible foil gas dynamic bearing includes a top foil 14, which cooperates with the elastic support element 4 to achieve dynamic pressure support. The bearing sleeve 1 has an air inlet channel 6 adapted to the gas static bearing. A movable clearance 5 is provided between the bearing bush 2 of the gas static bearing and the bearing sleeve 1. A sealing ring 3 is also provided between the bearing sleeve 1 and the bearing bush 2. A throttle 9 is provided on the bearing bush 2 of the gas static bearing. This provides good elasticity and damping effects, improves load-bearing capacity, and enhances the operational stability of the shaft system.

[0066] like Figure 18As shown in the figure, this is an embodiment of a hybrid support system using gas static bearings and elastic foil gas dynamic bearings. Two gas static bearings and one elastic foil gas dynamic bearing are placed side-by-side along the axis of the bearing sleeve 1. One gas static bearing is located at one end inside the bearing sleeve 1, and the other at the other end. The elastic foil gas dynamic bearing is positioned between the two gas static bearings. The elastic foil gas dynamic bearing includes a top foil 14, which cooperates with an elastic support element 4 to achieve dynamic pressure support. The bearing sleeve 1 has air inlet channels 6 adapted to the two gas static bearings respectively. A clearance 5 is provided between the bearing shell 2 of each gas static bearing and the bearing sleeve 1. A sealing ring 3 is provided between the bearing sleeve 1 and each bearing shell 2. A throttle 9 is provided on the bearing shell 2 of each gas static bearing. This provides good elasticity and damping effects, improves load-bearing capacity, and enhances the operational stability of the shaft system.

[0067] The hydrostatic bearing lubrication medium involved in this invention can be either gas or liquid.

Claims

1. A gas hydrostatic bearing with an elastic support element, comprising a bearing sleeve (1), a bearing bush (2), a sealing ring (3), and an elastic support element (4), characterized in that: The bearing bush (2) is cylindrical in shape and is installed inside the bearing sleeve (1); A movable gap (5) is provided between the bearing bush (2) and the bearing sleeve (1); a sealing ring (3) and an elastic support element (4) are provided between the bearing bush (2) and the bearing sleeve (1). The sealing ring (3) and the elastic support element (4) are in contact with the bearing bush (2) and the bearing sleeve (1) and provide elastic support and damping.

2. A gas hydrostatic bearing with an elastic support element according to claim 1, characterized in that: The outer circumferential surfaces at both ends of the bearing bush (2) are provided with sealing ring grooves for installing sealing rings (3), and the middle position is provided with elastic support element grooves for installing elastic support elements (4). Alternatively, the sealing groove for installing the sealing ring (3) and the elastic support element groove for installing the elastic support element (4) are opened on the inner circumferential surface of the bearing sleeve (1). The sum of the depth of the sealing ring groove and the movable clearance (5) is equal to the standard groove depth of the corresponding sealing ring (3); the sum of the depth of the elastic support element groove and the movable clearance (5) is equal to the height of the installed elastic support element (4).

3. A gas hydrostatic bearing with an elastic support element according to claim 2, characterized in that: The bearing sleeve (1) has an air inlet channel (6), through which high-pressure gas introduced from the outside is introduced into the movable gap (5) between the bearing sleeve (1) and the bearing bush (2), and flows through the throttling element hole to the inner surface of the bearing bush (2) and the shaft, providing static pressure air flotation; The sealing ring (3) is located on the gas transmission path between the intake channel (6) and the throttling element hole. It is used to seal the movable gap (5) between the bearing sleeve (1) and the bearing bush (2), so that the gas in the intake channel (6) flows to the throttling element hole after being sealed.

4. A gas hydrostatic bearing with an elastic support element according to claim 3, characterized in that: The bearing bush (2) has multiple throttling holes (8) on its circumferential surface. Each throttling hole (8) is evenly distributed along the circumferential direction and symmetrically arranged on both sides along the axial direction. At this time, the throttling element hole is a throttling hole (8). Alternatively, multiple small-hole throttles (9) or micro-hole throttles (9) are installed on the circumferential surface of the bearing bush (2), in which case the throttle element hole is a through hole on the small-hole throttle (9) or micro-hole throttle (9).

5. A gas hydrostatic bearing with an elastic support element according to claim 3, characterized in that: The bearing bush (2) has multiple radial holes on its circumferential surface. Each radial hole is a two-stage stepped hole with a decreasing diameter from the outside to the inside. The throttling element hole is a two-stage stepped hole.

6. A gas hydrostatic bearing with an elastic support element according to claim 3, characterized in that: The bearing bush (2) is an assembly consisting of two inner and outer cylindrical layers. The inner cylindrical layer uses a porous material throttling device (12) to provide throttling through the gaps in the porous material itself. The throttling element hole is the gap in the porous material itself. The outer cylindrical layer is made of metal. The metal outer cylindrical layer is in contact with the sealing ring (3) and the elastic support element (4). An air supply channel (10) is provided on the metal outer cylindrical layer. The air inlet channel (6) and the air supply channel (10) are connected through the air supply port (11).

7. A gas hydrostatic bearing with an elastic support element according to claim 1, characterized in that: A metal gasket (7) is installed between the elastic support element (4) and the bearing bush (2), and a metal gasket (7) is installed between the elastic support element (4) and the bearing sleeve (1).

8. A gas hydrostatic bearing with an elastic support element according to claim 3, characterized in that: The throttling element hole is arranged at the axial center of the bearing (2), and the elastic support element (4) is arranged on both sides of the air supply channel (10) of the throttling element hole. If a porous material throttle (12) is used, the air supply port (11) of the porous material throttle (12) is arranged at the axial center of the bearing (2), and the elastic support element (4) is arranged on both sides of the air supply port (11) of the porous material throttle (12). Alternatively, at least three rows of throttling element holes are provided along the axial direction, and elastic support elements (4) are arranged between adjacent rows of throttling element holes.

9. A gas hydrostatic bearing with an elastic support element according to claim 3, characterized in that: The elastic support element (4) is a corrugated foil, a wire mesh, or a metal rubber.

10. A gas hydrostatic bearing with an elastic support element according to claim 3, characterized in that: The elastic support element (4) is a helical spring (13). Multiple semi-circular grooves are uniformly arranged in an annular shape on both the bearing sleeve (1) and the bearing bush (2) in the axial direction. The opposing semi-circular grooves on the bearing sleeve (1) and the bearing bush (2) form a circular groove. Multiple helical springs (13) are respectively arranged in multiple circular grooves.

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