Radial dynamic and static pressure mixed gas bearing

Abstract

The utility model provides a radial dynamic and static pressure mixed gas bearing, relates to the technical field of bearings, and solves the technical problems in the prior art that the bearing capacity of a dynamic pressure gas bearing is relatively weak, and a gas film is easy to break down under extreme working conditions. The device comprises a bearing sleeve, a top foil, a bump foil, a pneumatic connector and an air inlet pipe, the top foil is connected with the bearing sleeve and located on the inner side of the bearing sleeve, the bump foil is located between the top foil and the bearing sleeve, and the pneumatic connector is connected with the air inlet pipe. The pneumatic connector is located at the bearing sleeve, one end of the pneumatic connector penetrates through the bearing sleeve and is connected with the top foil, and the other end of the pneumatic connector is connected with the air inlet pipe. The top foil is provided with an air inlet hole, and the air inlet hole, the pneumatic connector and the air inlet pipe form an air flow channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field especially is related to a radial dynamic static pressure mixed gas bearing. BACKGROUND

[0002] The dynamic pressure gas foil bearing is mainly composed of a bearing body, a top foil and an elastic supporting structure. When the bearing works, a wedge structure is formed between the top foil and a high-speed rotor. Due to the viscosity of the gas, the rotor drives the gas to move when rotating. In the wedge area, the gas is compressed to form a high-pressure gas film, which can stably support the rotor to run. Therefore, the dynamic pressure gas foil bearing has very low energy consumption in work, and the energy consumption mainly comes from the loss caused by gas friction. However, the gas viscosity is low, which makes the dynamic pressure gas bearing have weak carrying capacity, and it is easy to break the gas film and cause mechanical failure under complex and heavy load working conditions. SUMMARY

[0003] The utility model discloses a radial dynamic static pressure mixed gas bearing to solve the technical problem that the carrying capacity of the dynamic pressure gas bearing is weak and the gas film is easy to break in the prior art. The preferred technical solutions in the utility model provide many technical effects, which are described below.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] The utility model provides a radial dynamic static pressure mixed gas bearing, which comprises a bearing sleeve, a top foil, a wave foil, a pneumatic connector and an air inlet pipe. The top foil is connected with the bearing sleeve and located on the inner side of the bearing sleeve. The wave foil is located between the top foil and the bearing sleeve. The pneumatic connector is located at the bearing sleeve and one end of the pneumatic connector penetrates through the bearing sleeve and is connected with the top foil. The other end of the pneumatic connector is connected with the air inlet pipe.

[0006] The top foil is provided with an air inlet hole. The air inlet hole, the pneumatic connector and the air inlet pipe form a gas flow channel.

[0007] Optionally, the top foil is an integral molding structure, and the bearing sleeve and the top foil form a line support tilting pad structure.

[0008] Optionally, the top foil comprises an arc-shaped tile and a connecting convex strip. The outer side wall of the arc-shaped tile is fixedly connected with the connecting convex strip. The connecting convex strip is provided with a threaded hole. The arc-shaped tile is provided with the air inlet hole. The threaded hole is in communication with the air inlet hole. The pneumatic connector is threadedly connected with the threaded hole.

[0009] Optionally, an arc-shaped slot is arranged on the side wall of the connecting convex strip, an inwardly recessed concave slot is arranged on the inner wall of the bearing sleeve, the connecting convex strip is located in the concave slot, and the length of the concave slot is not less than the length of the connecting convex strip.

[0010] Optionally, the end of the concave slot is arranged in an arc-shaped structure, and the number of the arc-shaped slots is two.

[0011] Optionally, a containing slot is arranged on the outer wall of the bearing sleeve, a through hole is arranged between the containing slot and the concave slot, the pneumatic connector is located in the containing slot, one end of the pneumatic connector passes through the through hole and is threadedly connected with the threaded hole, and a part of the air inlet pipe is located in the containing slot.

[0012] Optionally, one top foil corresponds to two wave foils, and the two wave foils are located on the two sides of the connecting convex strip.

[0013] Optionally, the number of the top foils, the pneumatic connectors and the air inlet pipes is the same and one-to-one correspondence, and all the top foils are distributed along the circumferential direction of the bearing sleeve.

[0014] Optionally, the utility model also comprises comb tooth seal pieces, the number of the comb tooth seal pieces is two, the comb tooth seal pieces are located in the bearing sleeve, and the two comb tooth seal pieces are located at the two ends of the top foil.

[0015] The radial dynamic and static pressure mixed gas bearing provided by the utility model is connected with the bearing sleeve and located on the inner side of the bearing sleeve, the wave foil is located between the top foil and the bearing sleeve, the pneumatic connector is located at the bearing sleeve and one end of the pneumatic connector passes through the bearing sleeve and is connected with the top foil, the other end of the pneumatic connector is connected with the air inlet pipe, the air inlet hole, the pneumatic connector and the air inlet pipe form a gas flow channel, the other end of the air inlet pipe can be connected with a high-pressure gas conveying structure, when extreme working conditions are encountered, high-pressure gas is input into the working interval of the bearing from the air inlet pipe, the pneumatic connector and the air inlet hole, the high-pressure gas static pressure and the foil bearing dynamic pressure act simultaneously, the bearing carrying capacity is improved, and the technical problems of the weak carrying capacity of the dynamic pressure gas bearing and the easy breakdown of the gas film under extreme working conditions in the prior art are solved.

[0016] The preferred technical scheme of the utility model can at least produce the following technical effects:

[0017] The radial dynamic and static pressure mixed gas bearing provided by the utility model has a line support tiltable tile structure, and the principle of the line support tiltable tile structure is to realize the tilting movement of the top foil through the tilting angle of the tiltable tile.

[0018] The top foil can swing freely with the change of the rotating speed, the load and the bearing temperature, and multiple wedge structures are formed around the shaft neck, and the pressure of each wedge structure is always directed to the center, so that the stability is high; the line support tiltable tile structure can reduce the vibration and noise of the bearing, and improve the overall stability and working efficiency of the mechanical equipment.

[0019] In addition, the radial dynamic and static pressure mixed gas bearing further comprises comb tooth sealing pieces, and a sealing pressure maintaining cavity is formed between the two comb tooth sealing pieces, the bearing sleeve and the rotating working area, so that the gas overflow can be avoided, the gas pressure in the sealing pressure maintaining cavity can be enhanced, the environmental pressure in the bearing can be improved, the gas film stability can be enhanced, the dynamic pressure effect can be enhanced, and the bearing carrying capacity can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0021] Figure 1 It is a structure schematic view of the radial dynamic and static pressure mixed gas bearing provided by the utility model embodiment;

[0022] Figure 2 It is an explosion view of the radial dynamic and static pressure mixed gas bearing provided by the utility model embodiment;

[0023] Figure 3 It is a sectional view of the radial dynamic and static pressure mixed gas bearing provided by the utility model embodiment;

[0024] Figure 4It is a structure schematic view of the top foil, the pneumatic joint and the air inlet pipe connection of the radial dynamic and static pressure hybrid gas bearing provided by the embodiment of the utility model.

[0025] Figure 5 It is a sectional view of the top foil, the pneumatic joint and the air inlet pipe connection of the radial dynamic and static pressure hybrid gas bearing provided by the embodiment of the utility model.

[0026] In the figure, 1, bearing sleeve; 11, concave groove; 12, containing groove;

[0027] 2, top foil; 21, air inlet hole; 22, arc-shaped tile; 23, connecting convex strip; 231, screw hole; 232, arc-shaped groove;

[0028] 3, wave foil;

[0029] 4, pneumatic joint;

[0030] 5, air inlet pipe;

[0031] 6, comb tooth sealing element. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of the utility model.

[0033] In the description of the utility model, it is necessary to explain that, unless otherwise stated, the meaning of "a plurality of" is two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the utility model, still need to explain, unless another explicit provision and limitation, term " install ", " link ", " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can pass through intermediate medium indirectly connect.

[0035] The utility model provides a kind of radial dynamic static pressure mixed gas bearing, including bearing sleeve 1, top foil 2, wave foil 3, pneumatic joint 4 and intake pipe 5, wherein, top foil 2 is connected with bearing sleeve 1 and top foil 2 is located at the inside of bearing sleeve 1, wave foil 3 is located between top foil 2 and bearing sleeve 1, pneumatic joint 4 is located at bearing sleeve 1 and one end of pneumatic joint 4 passes through bearing sleeve 1 and is connected with top foil 2, the other end of pneumatic joint 4 is connected with intake pipe 5;Intake hole 21 is provided on top foil 2, intake hole 21, pneumatic joint 4 and intake pipe 5 form gas flow passage.The radial dynamic static pressure mixed gas bearing provided by the utility model, the other end of intake pipe 5 can be connected with high-pressure gas conveying structure, when encountering extreme working condition, by inputting high-pressure gas from intake pipe 5, pneumatic joint 4 and intake hole 21 into the working interval of bearing bearing, by high-pressure gas static pressure and foil bearing dynamic pressure acting simultaneously, the bearing carrying capacity is improved, the technical problems of weak carrying capacity of dynamic pressure gas bearing and extreme working condition gas film easy to break in the prior art are solved.

[0036] As optional implementation, top foil 2 is integrally formed structure, and bearing sleeve 1 and top foil 2 form line support tilting pad structure, improve bearing dynamics stability, without welding high reliability.Line support tilting pad structure is realized by the inclination angle of tilting pad to realize the inclination movement of top foil 2.Rotor passes through bearing sleeve 1, and top foil 2 is distributed in the circumferential direction of rotor.When rotor is offset in radial and axial under the action of force (i.e. when rotor is vibrated), due to the existence of inclination angle, top foil 2 will make corresponding inclination movement, and then will change the range of wedge-shaped area, so as to change the compression degree of gas, finally change the pressure-bearing capacity of high-pressure gas film, so that the stress of rotor is more stable, so that the service life of radial dynamic static pressure mixed gas bearing can be prolonged.In addition, line support tilting pad structure forms wedge-shaped support between pad surface and journal surface by fluid dynamic pressure of gas film, so that two surfaces are completely separated from contact, further reduce friction and wear.

[0037] Because the top foil 2 can swing freely with the different rotating speed, load and bearing temperature, multiple wedge structures are formed around the shaft neck, and the pressure of each wedge structure is always directed to the center, having higher stability; the line support tilting pad structure can reduce the vibration and noise of the bearing, improving the overall stability and working efficiency of the mechanical equipment.

[0038] As an optional implementation, the top foil 2 comprises an arc-shaped tile 22 and a connecting protrusion 23, the outer side wall of the arc-shaped tile 22 is fixedly connected with the connecting protrusion 23, the connecting protrusion 23 is located in the middle region of the arc-shaped tile 22, the length direction of the connecting protrusion 23 is consistent with the axial direction of the arc-shaped tile 22, the length of the connecting protrusion 23 is consistent with the width of the arc-shaped tile 22, a threaded hole 231 is arranged on the connecting protrusion 23, an air inlet hole 21 is arranged on the arc-shaped tile 22, the threaded hole 231 is in communication with the air inlet hole 21, and the pneumatic connector 4 is threadedly connected with the threaded hole 231.

[0039] As an optional implementation, an arc-shaped groove 232 is arranged on the side wall of the connecting protrusion 23, an inwardly recessed concave groove 11 is arranged on the inner wall of the bearing sleeve 1, the connecting protrusion 23 is located in the concave groove 11, and the length of the concave groove 11 is not less than the length of the connecting protrusion 23. The end of the concave groove 11 is located in the arc-shaped groove 232. The end of the concave groove 11 is arranged in an arc-shaped structure, the number of the arc-shaped grooves 232 is two, the two ends of the concave groove 11 are respectively located in the two arc-shaped grooves 232, and the structures of the concave groove 11 and the arc-shaped groove 232 are to avoid limiting the bearing sleeve 1 from being separated from the top foil 2, and meanwhile, the top foil 2 can swing relative to the bearing sleeve 1.

[0040] As an optional implementation, a containing groove 12 is arranged on the outer wall of the bearing sleeve 1, a through hole is arranged between the containing groove 12 and the concave groove 11, the pneumatic connector 4 is located in the containing groove 12, one end of the pneumatic connector 4 passes through the through hole and is threadedly connected with the threaded hole 231, and a part of the air inlet pipe 5 is located in the containing groove 12. The containing groove 12 is used to hide the pneumatic connector 4 and the air inlet pipe 5.

[0041] As an optional implementation, one top foil 2 corresponds to two wave foils 3, and the two wave foils 3 are respectively located on the two sides of the connecting protrusion 23. The number of the top foils 2, the pneumatic connectors 4 and the air inlet pipes 5 is the same and one-to-one correspondence, all the top foils 2 are distributed along the circumferential direction of the bearing sleeve 1, the number of the containing grooves 12 is consistent with the number of the pneumatic connectors 4, and the number of the concave grooves 11 is consistent with the number of the top foils 2.

[0042] As an optional implementation, the sealing structure further comprises two comb sealings 6, which are arranged in the bearing sleeve 1 and located at two ends of the top foil 2. The outer wall of the comb sealing 6 is sealed with the inner wall of the bearing sleeve 1, and the inner wall of the comb sealing 6 is sealed with the inner wall of the rotor. The two comb sealings 6 seal the bearing sleeve 1 and the working area of the rotor as a high-pressure air cavity, thereby enhancing the stability of the air film, enhancing the dynamic pressure effect, and improving the bearing carrying capacity.

[0043] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A radial hydrostatic mixed gas bearing, characterized in that, Includes a bearing sleeve (1), a top foil (2), a corrugated foil (3), a pneumatic connector (4), and an intake pipe (5), wherein, The top foil (2) is connected to the bearing sleeve (1) and the top foil (2) is located inside the bearing sleeve (1). The wave foil (3) is located between the top foil (2) and the bearing sleeve (1). The pneumatic connector (4) is located at the bearing sleeve (1) and one end of the pneumatic connector (4) passes through the bearing sleeve (1) and is connected to the top foil (2). The other end of the pneumatic connector (4) is connected to the air inlet pipe (5). The top foil (2) is provided with an air inlet (21), and the air inlet (21), the pneumatic connector (4) and the air inlet pipe (5) form a gas flow channel.

2. The radial hydrostatic mixed gas bearing according to claim 1, characterized in that, The top foil (2) is an integrally formed structure, and the bearing sleeve (1) and the top foil (2) form a line-supported tilting tile structure.

3. A radial hydrostatic mixed gas bearing according to claim 1, characterized in that, The top foil (2) includes an arc-shaped tile (22) and a connecting ridge (23). The outer wall of the arc-shaped tile (22) is fixedly connected to the connecting ridge (23). The connecting ridge (23) is provided with a threaded hole (231). The arc-shaped tile (22) is provided with an air inlet (21). The threaded hole (231) is connected to the air inlet (21). The pneumatic connector (4) is threadedly connected to the threaded hole (231).

4. A radial hydrostatic mixed gas bearing according to claim 3, characterized in that, The connecting protrusion (23) has an arc-shaped groove (232) on its side wall, and the bearing sleeve (1) has an inwardly recessed groove (11) on its inner wall. The connecting protrusion (23) is located in the groove (11) and the length of the groove (11) is not less than the length of the connecting protrusion (23). The end of the groove (11) is located in the arc-shaped groove (232).

5. A radial hydrostatic mixed gas bearing according to claim 4, characterized in that, The end of the concave groove (11) is set as an arc-shaped structure, and there are two arc-shaped grooves (232).

6. A radial hydrostatic mixed gas bearing according to claim 4, characterized in that, The outer wall of the bearing sleeve (1) is provided with a receiving groove (12), and a through hole is provided between the receiving groove (12) and the concave groove (11). The pneumatic connector (4) is located in the receiving groove (12), and one end of the pneumatic connector (4) passes through the through hole and is threadedly connected to the threaded hole (231). A part of the air inlet pipe (5) is located in the receiving groove (12).

7. A radial hydrostatic mixed gas bearing according to claim 3, characterized in that, One top foil (2) corresponds to two wave foils (3), and the two wave foils (3) are located on both sides of the connecting protrusion (23).

8. A radial hydrostatic mixed gas bearing according to claim 1, characterized in that, The number of the top foil (2), the pneumatic connector (4) and the air inlet pipe (5) are the same and correspond one-to-one. All the top foils (2) are distributed along the circumferential direction of the bearing sleeve (1).

9. A radial hydrostatic mixed gas bearing according to claim 1, characterized in that, It also includes a comb seal (6), there are two comb seals (6), the comb seals (6) are located inside the bearing sleeve (1), and the two comb seals (6) are located at the two ends of the top foil (2).

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