Self-dehumidification type hydrostatic air bearing

Abstract

To provide a self-dehumidification type hydrostatic air bearing which solves a problem that the bearing becomes unable to operate in a reliable manner by a gas-liquid mixture being liquefied and changed to water droplets in a process that the gas-liquid mixture undergoes a throttling expansion.SOLUTION: The invention relates to a bearing, in particular, a self-dehumidification type hydrostatic air bearing. The self-dehumidification type hydrostatic air bearing includes a bearing holder, a rotary shaft, a magnetic material, and a throttling vaporization structure. In the bearing holder, a cavity is provided therein and a suction pipe is provided on an outer surface. The rotary shaft is provided fitted in the bearing holder. The magnetic material is fitted on an exterior of the rotary shaft. The throttling vaporization structure is provided in the cavity and forms a first gap with the magnetic material. The first gap penetrates through the bearing holder to form an exhaust passage. The throttling vaporization structure is configured to decrease a temperature of a medium by constricting flow of the medium placed in the cavity and generate eddy current through magnetic field induction to heat and vaporize the medium after the temperature of the medium is decreased.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bearing, and more particularly to a self-dehumidifying hydrostatic air bearing.

Background Art

[0002] A bearing is one of the core components of a power machine. For example, Patent Document 1 discloses a hydrostatic air bearing. The hydrostatic air bearing has a strong load-bearing capacity, and in order to further improve the compatibility with the power system, high-pressure gas inside the power system may be used as the bearing medium. Compared with conventional oil-lubricated bearings, an oil supply system can be omitted, the frictional loss of the bearing can be reduced, and the simplification of the power system and the improvement of energy efficiency can also be realized. In some power systems, for example, in the steam system of a nuclear power plant, water vapor liquefies and changes into water droplets during the throttling and expansion process.

[0003] When such a medium is supplied as the medium of the hydrostatic air bearing, during the throttling process of the hydrostatic air bearing, the pressure and temperature of the gas decrease and liquefy, and the gas-liquid mixture enters the gap of the bearing, which may cause the bearing to fail to operate reliably.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a self-dehumidifying hydrostatic air bearing that solves the problem of the prior art that the bearing cannot operate reliably due to liquefaction and change into water droplets during the throttling and expansion process of the gas-liquid mixture.

Means for Solving the Problems

[0006] In order to solve the above problems, the self-dehumidifying hydrostatic air bearing according to the present invention includes a bearing holder having a cavity provided therein and an intake pipe communicating with the cavity provided on an outer surface thereof, a rotating shaft bored in the bearing holder, a magnetic body externally fitted outside the radial direction of the rotating shaft and generating a magnetic field when the rotating shaft rotates, and a throttle vaporization structure provided in the cavity and having a first gap with the magnetic body. The first gap forms an exhaust passage penetrating through the bearing holder. The throttle vaporization structure is configured to lower the temperature by throttling the medium entering the cavity, and after lowering the temperature of the medium, heat and vaporize the medium by generating eddy currents by magnetic field induction. The exhaust passage is used for discharging gas.

[0007] In the present invention, the throttle vaporization structure includes a plurality of annular throttles and a plurality of annular vaporizers. The plurality of annular throttles and the plurality of annular vaporizers are externally fitted alternately. The intake pipe is installed adjacent to the outermost annular throttle in the radial direction. The magnetic body is installed adjacent to the innermost annular throttle in the radial direction. A first gap is provided between the innermost annular throttle and the magnetic body.

[0008] In the present invention, a second gap is formed between the outermost annular throttle and the inner wall of the bearing holder. The second gap forms an intake passage, and the intake passage communicates with the intake pipe.

[0009] In the present invention, each annular throttle is a non-metallic annular throttle, and the annular throttle is formed of a material having a porous structure in order to lower the temperature by throttling the medium.

[0010] In the present invention, each of the annular vaporizers is a metallic annular vaporizer, and a plurality of first through holes are provided on the surface of the annular vaporizer. The annular vaporizer is configured to heat and vaporize the medium with a lowered temperature by generating eddy currents by a magnetic field.

[0011] In the present invention, the annular vaporizer is a wire mesh.

[0012] In the present invention, each of the annular vaporizers includes a plurality of the wire meshes, and the plurality of wire meshes are stacked and installed such that the meshes of each wire mesh are displaced.

[0013] In the present invention, the meshes of adjacent wire meshes have different shapes.

[0014] In the present invention, it further includes a sheath externally fitted to the outside of the magnetic body.

[0015] In the present invention, the bearing holder includes an annular member and a pair of end caps. The pair of end caps are respectively installed at both ends of the annular member. Each end cap is provided with a second through hole through which the rotating shaft is drilled. In order to form the exhaust passage, the diameter of the second through hole is made larger than the diameter of the magnetic body.

Advantages of the Invention

[0016] According to the present invention, by providing the magnetic body and the throttle vaporization structure, due to the throttling effect, the temperature and pressure of the medium can be reduced, and according to the principle of electromagnetic induction, the liquid phase in the medium can be vaporized into a gas. Therefore, in the operation process of the hydrostatic air bearing, it is possible to avoid the liquid entering the first gap and causing the hydrostatic air bearing to be unable to operate stably, and the certainty of the operation of the hydrostatic air bearing is improved.

Brief Description of the Drawings

[0017] To more clearly explain the technical solution of the present invention or the prior art, the following briefly introduces the accompanying drawings necessary for the description of the embodiments or the prior art. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these accompanying drawings without creative effort.

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0018] In order to further clarify the object, technical solution, and advantages of the present invention, the following will clearly and completely describe the technical solution of the present invention with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts are within the protection scope of the present invention.

[0019] According to the terms "first" and "second" in the specification and claims of the present invention, it can be explicitly or implicitly stated that one or more of the said components are included. In the description of the present invention, unless otherwise explained separately, "a plurality" means two or more.

[0020] The following will describe the self-dehumidifying type static pressure air bearing in the present invention with reference to FIGS. 1 and 2.

[0021] As shown in FIG. 1, the self-dehumidifying hydrostatic air bearing according to the embodiment of the present invention includes a bearing holder 10, a rotating shaft 20, a magnetic body 30, and a throttling vaporization structure. Hereinafter, the direction in which the rotating shaft 20 extends is defined as the axial direction, and the direction orthogonal to the axial direction is defined as the radial direction of the rotating shaft 20. A cavity is provided inside the bearing holder 10, and an intake pipe 50 communicating with the cavity is provided on the outer surface of the bearing holder 10 in the radial direction. The rotating shaft 20 is bored through the bearing holder 10. In other words, a through hole penetrating in the axial direction is opened in the bearing holder 10, and the rotating shaft 20 is inserted into the through hole. The magnetic body 30 is externally fitted to the outside (outer peripheral surface) of the rotating shaft 20. The magnetic body 30 is for generating a magnetic field when the rotating shaft 20 rotates. The throttling vaporization structure is provided in the cavity and has a first gap 101 between the throttling vaporization structure and the magnetic body 30. The first gap 101 forms an exhaust passage penetrating the bearing holder 10 in the axial direction. The throttling vaporization structure is configured to lower the temperature of the medium by throttling the medium entering the cavity, and after lowering the temperature of the medium, heat and vaporize the medium by generating eddy currents by magnetic field induction. The exhaust passage is used to discharge the gas (vaporized medium) to the outside of the bearing holder 10.

[0022] Specifically, when the rotating shaft 20 rotates, the magnetic body 30 is interlocked so as to rotate as well. That is, when the rotating shaft 20 rotates, the magnetic body 30 rotates integrally with the rotating shaft 20. When the magnetic body 30 rotates, a magnetic field is generated. The intake pipe 50 is used to pass (supply) the medium into the cavity of the bearing holder 10. In this embodiment, a gas-phase medium or a gas-liquid medium that is easily liquefied is used as the medium. Further, the throttling vaporization structure has a layered structure. When the medium passes through the throttling vaporization structure, first, a throttling effect occurs, and the pressure and temperature of the medium decrease. The throttling vaporization structure induces and generates eddy currents by the action of the magnetic field, heats the liquid phase in the medium to vaporize it into a gas, and the gas is discharged from the exhaust passage. Thereby, the hydrostatic air bearing performs a self-dehumidifying function during the operation process, and it is avoided that liquid enters the first gap 101 of the hydrostatic air bearing and the hydrostatic air bearing cannot operate stably.

[0023] Furthermore, in the embodiment of the present invention, the magnetic body 30 is a permanent magnet with an annular structure. When the rotation axis 20 rotates, the magnetic body 30 is interlocked to rotate as well, and a magnetic field is further generated. The throttle vaporization structure generates eddy currents according to the principle of electromagnetic induction, and then heats and vaporizes the liquid phase in the medium.

[0024] Furthermore, in the embodiment of the present invention, the plurality of intake pipes 50 are sequentially provided along the circumferential surface of the bearing holder 10.

[0025] In the self-dehumidifying type hydrostatic air bearing provided by the embodiment of the present invention, due to the installation of the magnetic body 30 and the throttle vaporization structure, the throttle effect can reduce the temperature and pressure of the medium, and according to the principle of electromagnetic induction, the liquid phase in the medium can be vaporized into gas. In the operation process of the hydrostatic air bearing, after the liquid enters the first gap 101, it can be avoided that the hydrostatic air bearing cannot operate stably, so the reliability of the operation of the hydrostatic air bearing is improved.

[0026] Furthermore, in the embodiment of the present invention, the throttle vaporization structure includes a plurality of annular throttles 41 and a plurality of annular vaporizers 42. The plurality of annular throttles 41 and the plurality of annular vaporizers 42 are externally fitted alternately. The intake pipe 50 is installed adjacent to the first (the outermost in the radial direction) annular throttle 41, and the magnetic body 30 is installed adjacent to the last (the innermost in the radial direction) annular throttle 41. There is a first gap 101 between the last annular throttle 41 and the magnetic body 30.

[0027] Specifically, in the present embodiment, the plurality of annular throttles 41 and the plurality of annular vaporizers 42 are externally fitted alternately in sequence, thereby forming a multi-layer throttle structure and a multi-layer vaporization structure. Each time the medium passes through one layer of the throttle structure, the temperature and pressure of the medium are reduced. Each time the medium passes through one layer of the vaporization structure, the liquid phase in the medium is vaporized, so that the medium becomes a pure gas, and it is avoided that the liquid enters into the first gap 101. Moreover, in the process of the medium flowing, the steps of cooling and then heating are performed multiple times, so that it is avoided that the temperature of the static pressure air bearing is locally too high and affects the service life.

[0028] In the self-dehumidifying type static pressure air bearing according to the embodiment of the present invention, the plurality of annular throttles 41 and the plurality of annular vaporizers 42 are alternately installed. In the process of the medium flowing, the temperature drop and the pressure drop are performed multiple times, so as to ensure that the pressure of the static pressure air bearing is normal, and it is avoided that the temperature of the static pressure air bearing is locally too high and affects the service life of the static pressure air bearing. In addition, since heating is performed multiple times, each time the medium passes through one annular vaporizer 42, the liquid phase in the medium is vaporized into a gas, so that the medium becomes a pure gas, and it is avoided that the liquid enters into the first gap 101 of the static pressure air bearing, and the reliability of the operation of the static pressure air bearing can be ensured.

[0029] As shown in FIG. 1, in the embodiment of the present invention, a second gap 102 is formed between the outermost annular throttle 41 in the radial direction and the inner wall of the bearing holder 10. The second gap 102 forms an intake passage, and the intake passage communicates with the intake pipe 50.

[0030] Specifically, as shown in FIG. 1, in the embodiment of the present invention, the bearing holder 10 includes an annular member 11 and a pair of end caps 12. The pair of end caps 12 are respectively installed at both ends of the annular member 11 so as to be separated from each other in the axial direction. Each end cap 12 is provided with a second through hole through which the rotating shaft 20 is drilled. The diameter of the second through hole is made larger than the diameter of the magnetic body 30 so as to form an exhaust passage.

[0031] Specifically, a pair of end caps 12 are respectively installed at both ends of the annular member 11, so that a cavity is defined inside the hydrodynamic air bearing 10. The annular throttle 41 and the annular vaporizer 42 are alternately externally fitted in the cavity. There is a second gap 102 between the annular throttle 41 and the annular member 11, and the second gap 102 forms an intake passage. The two end faces of the magnetic body 30 are flush with the two end caps 12, and the diameter of the magnetic body 30 is smaller than the diameter of the second through hole. Thereby, there is a first gap 101 between the magnetic body 30 and the last (the innermost in the radial direction) annular throttle 41, and the first gap 101 is used to discharge a medium that is a pure gas.

[0032] As shown in FIG. 1, in the embodiment of the present invention, each annular throttle 41 is a non-metallic annular throttle, and the annular throttle 41 is made of a material having a porous structure in order to lower the temperature by throttling the medium. Each annular vaporizer 42 is a metallic annular vaporizer, and a plurality of first through holes are provided on the surface of the annular vaporizer 42. The annular vaporizer 42 is used to heat and vaporize the medium with a lowered temperature by generating eddy currents under a magnetic field.

[0033] Specifically, in this embodiment, the annular throttle 41 is formed of a material having a porous structure. Specifically, the annular throttle 41 is formed of a non-metallic material having a more porous structure. When a gas-phase medium or a gas-liquid medium that is easily liquefied passes through the annular throttle 41, due to the throttling effect of the small holes, the pressure and temperature of the medium decrease, and in some cases, a liquid may be generated accordingly. When the medium flows to the annular vaporizer 42, the annular vaporizer 42 induces and generates eddy currents by the action of a magnetic field, uses the eddy currents to heat the medium, and further vaporizes the liquid phase in the medium into a gas to heat the medium to a temperature above the saturation temperature. At this time, the pressure of the medium remains substantially unchanged. When the medium flows back to the annular throttle 41 on the radially inner side, the pressure and temperature of the medium decrease again due to the throttling effect of the small holes. At the same time, some of the gas-phase medium may be liquefied into a liquid. When the medium flows back to the annular vaporizer 42 on the radially inner side, the annular vaporizer 42 reheats and vaporizes the liquid in the medium to make the medium a pure gas. By alternately arranging the annular throttle 41 and the annular vaporizer 42 in this way, after the medium passes through a plurality of annular throttles 41 and a plurality of annular vaporizers 42, its pressure continuously decreases and meets the usage requirements of the hydrostatic air bearing.

[0034] Optionally, the material having a porous structure may be a porous ceramic, a carbon material, or the like.

[0035] When the medium flows to the annular vaporizer 42 that is the innermost in the radial direction, since the annular vaporizer 42 is closest to the magnetic body 30, the heating efficiency of the eddy currents generated by induction is also maximized. Then, when the medium passes through the annular throttle 41 that is the innermost in the radial direction, even after the temperature and pressure of the medium decrease, it is ensured that the medium remains a pure gas without change, and it is avoided that the liquid enters the first gap 101.

[0036] Furthermore, in the embodiment shown in FIG. 1, there are three annular throttles 41 and two annular vaporizers 42. In this way, after the medium passes through the second annular vaporizer 42, it has a high temperature. Even after the medium passes through the third annular throttle 41 and its temperature drops, it remains unchanged and is not liquefied, ensuring that the medium is a pure gas.

[0037] Furthermore, in the embodiment of the present invention, the thicker the annular throttle 41 is, the more obvious the throttling effect generated when the medium passes through the annular throttle 41 becomes, and the greater the decrease in the temperature and pressure of the medium. Thereby, by adjusting the thickness of the annular throttle 41 according to the specific type of the medium, it is possible to lower the temperature and pressure of the high-temperature and high-pressure medium.

[0038] Furthermore, in the embodiment of the present invention, by minimizing the diameter of the small holes in the annular throttle 41 as much as possible, the flow resistance of the medium is increased, and the temperature and pressure of the medium are lowered.

[0039] Furthermore, the number of the annular throttles 41 and the annular vaporizers 42 is related to the pressure required for the operation of the hydrostatic air bearing. Therefore, by adjusting the number of the annular throttles 41 according to the pressure reduction effect of each annular throttle 41, the pressure of the medium can be made to meet the design requirements of the hydrostatic air bearing.

[0040] Furthermore, in this embodiment, the annular throttle 41 is formed of a non-metallic material, so that it is possible to avoid the annular throttle 41 generating eddy currents due to electromagnetic induction and losing its pressure drop function and temperature drop function.

[0041] As shown in FIG. 2, in the embodiment of the present invention, the annular vaporizer 42 is a wire mesh. When the medium passes through the wire mesh, the contact area between the medium and the wire mesh increases, that is, the total heat receiving area of the medium increases, and the medium can be heated uniformly, and the liquid phase in the medium can be effectively removed.

[0042] Furthermore, each annular vaporizer 42 may be a single layer of wire mesh or multiple (multi-layer) wire meshes. By stacking and providing multiple wire meshes, the heating efficiency can be increased and the vaporization effect of the liquid phase can be ensured.

[0043] Furthermore, in the embodiments of the present invention, the shape of the mesh of the wire mesh may be a triangular shape, a circular shape, a rectangular shape, or the like, but here, a triangular mesh is preferred. If a triangular mesh is used, the contact area between the medium and the wire mesh can be further increased, the heat receiving area of the medium can be further increased, and the vaporization effect can be improved.

[0044] In the self-dehumidifying type hydrostatic air bearing according to the embodiments of the present invention, by installing a wire mesh as the annular vaporizer 42, the heat receiving area of the medium can be increased, it is ensured that the medium is uniformly heated, and the liquid phase in the medium can be effectively removed.

[0045] Furthermore, when the number of wire meshes is multiple (multi-layer), by installing the meshes of each wire mesh so as to be displaced, the tightness of the mesh of the wire mesh is improved. That is, the wire mesh still exists in the cavities (gaps) of the mesh. Then, when the medium passes through the upper layer of the mesh, it can still contact the mesh of the lower layer of the wire mesh. In that case, by further heating the medium, the vaporization effect on the medium is ensured.

[0046] Furthermore, when multiple (multi-layer) wire meshes are stacked and installed, the shapes of the meshes of the wire meshes adjacent to each other can be selected as different shapes, and the tightness of the mesh can also be improved.

[0047] In the self-dehumidifying type hydrostatic air bearing according to the embodiments of the present invention, multiple layers of wire meshes are stacked and installed, and the meshes of the multiple layers of wire meshes are displaced, so that the heat receiving area of the medium is further increased, and during the process of the medium flowing, it can be further heated, and the vaporization effect on the medium is ensured.

[0048] As shown in FIG. 1, in the embodiment of the present invention, the self-dehumidifying hydrostatic air bearing further includes a sheath 60 provided outside the magnetic body 30. The sheath 60 serves as a protective layer that protects the magnetic body 30 from the medium. Specifically, since the sheath 60 is externally fitted outside the magnetic body 30, contact between the medium and the magnetic body 30 can be avoided.

[0049] The self-dehumidifying hydrostatic air bearing according to the embodiment of the present invention has a compact structure. While fully utilizing the original structure of the bearing, when the rotating shaft 20 rotates, according to the principle of electromagnetic induction, eddy currents are generated in the wire mesh provided between the multi-layered annular throttles 41 to heat the liquid phase in the medium, enabling automatic dehumidification during operation. There is no need to add heating equipment, and the manufacturing cost of the hydrostatic air bearing is reduced. In addition, the self-dehumidifying hydrostatic air bearing according to the embodiment of the present invention has an excellent dehumidification effect. The maximum temperature of the medium is kept low, and the throttling and heating of the medium are divided into multiple stages. In each stage, after the temperature is lowered by the annular throttle 41, heating is performed by the dense wire mesh, resulting in a larger total heating area and uniform heating, and effectively removing the liquid phase in the medium. Moreover, throughout the process, by performing the steps of first lowering the temperature of the medium and then heating it multiple times, it is possible to avoid the temperature of the bearing structure being too high locally and affecting the service life of the hydrostatic air bearing.

[0050] Finally, it should be noted that the above embodiments are not for limiting the technical solution (technical idea) of the present invention, but only for explanation. Although the present invention has been described in detail with reference to the above-described embodiments, as can be understood by those of ordinary skill in the art, still, it is possible to modify the technical solutions described in the above embodiments or perform equivalent substitutions for some of the constituent elements therein. Moreover, even if those modifications or substitutions are made, the corresponding technical solutions do not essentially deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Explanation of Reference Numerals

[0051] 10... bearing holder, 11... annular member, 12... end cap, 20... rotating shaft, 30... magnetic body, 41... annular throttle, 42... annular vaporizer, 50... intake pipe, 60... sheath, 101... first gap, 102... second gap

Claims

1. a bearing holder having a cavity therein and an intake pipe on an outer surface thereof that communicates with the cavity; A rotating shaft is provided in the bearing holder; a magnetic body that is fitted radially outside the rotating shaft and generates a magnetic field when the rotating shaft rotates; a throttling vaporization structure provided in the cavity and having a first gap between the magnetic body and the throttling vaporization structure, the first gap forms an exhaust passage penetrating the bearing holder, The throttling and vaporizing structure is configured to reduce the temperature of the medium by throttling the medium that has entered the cavity, and to heat and vaporize the medium by generating an eddy current through magnetic field induction after the temperature of the medium is reduced; The exhaust passage is used to exhaust gas. A self-dehumidifying hydrostatic air bearing.

2. The throttle vaporization structure includes a plurality of annular throttles and a plurality of annular vaporizers; The plurality of annular throttles and the plurality of annular vaporizers are fitted alternately on each other, The intake pipe is disposed adjacent to the radially outermost annular throttle, the magnetic body is disposed adjacent to the radially innermost annular aperture, The first gap is provided between the innermost annular aperture and the magnetic body.

2. The self-dehumidifying hydrostatic bearing according to claim 1.

3. a second gap is formed between the outermost annular throttle and an inner wall of the bearing holder; The second gap forms an intake passage, and the intake passage communicates with the intake pipe.

3. The self-dehumidifying hydrostatic bearing according to claim 2.

4. Each annular restriction is a non-metallic annular restriction; The annular throttle is made of a material having a porous structure to reduce the temperature by restricting the medium.

3. The self-dehumidifying hydrostatic bearing according to claim 2.

5. Each annular vaporizer is a metallic annular vaporizer; A plurality of first through holes are provided on a surface of the annular vaporizer, The annular vaporizer is configured to generate eddy currents by a magnetic field to heat and vaporize the medium whose temperature has been reduced.

3. The self-dehumidifying hydrostatic bearing according to claim 2.

6. 6. The self-dehumidifying hydrostatic air bearing according to claim 5, wherein said annular evaporator is a wire mesh.

7. The annular vaporizer includes a plurality of the wire meshes, The plurality of wire meshes are stacked and installed so that the meshes of each wire mesh are shifted.

7. The self-dehumidifying hydrostatic air bearing according to claim 6.

8. 8. The self-dehumidifying hydrostatic air bearing according to claim 7, wherein adjacent meshes of said wire mesh have different shapes.

9. 2. The self-dehumidifying hydrostatic air bearing according to claim 1, further comprising a sheath fitted around the outside of said magnetic body.

10. The bearing holder includes: a ring member and a pair of end caps, The pair of end caps are respectively installed on both ends of the ring member, Each end cap is provided with a second through hole through which the rotation shaft is drilled, In order to form the exhaust passage, the diameter of the second through hole is made larger than the diameter of the magnetic body.

2. The self-dehumidifying hydrostatic bearing according to claim 1.

Images