Heat exchange type dehumidification hydrostatic air bearing

Abstract

To improve reliability of operation of a hydrostatic air bearing.SOLUTION: A heat exchange type dehumidification hydrostatic air bearing of the invention includes a bearing holder 10, a rotary shaft 20, an annular orifice 30, and a plurality of heat exchange pipes 40. The annular orifice 30 is fitted on an exterior of the rotary shaft 20 and forms a first gap 101 with the rotary shaft 20. The first gap penetrates through the bearing holder and forms an exhaust passage. The annular orifice is configured to constrict flow of a medium to decrease a temperature. The heat exchange pipes 40 are incorporated into the annular orifice 30. In the heat exchange pipes 40, a heat exchange medium for heating and vaporizing a liquid phase of the medium whose temperature is decreased flows. The heat exchange pipes 40 heat and vaporize the medium in the liquid phase to avoid a situation that the liquid enters the first gap 101 to hinder the hydrostatic air bearing from operating stably and thereby improve reliability of the operation.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and particularly to a heat exchange type dehumidifying static pressure air bearing.

Background Art

[0002] A bearing is one of the core components of a power machine. A static pressure air bearing has a strong load-bearing capacity, and as the bearing medium, high-pressure gas inside the power system may be used. The bearing medium has good compatibility with the system. Compared with the conventional oil-lubricated bearing, the oil supply system can be omitted, the frictional loss of the bearing is 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. When such a medium is supplied as the medium of the static pressure air bearing, during the throttling process of the static pressure air bearing, the pressure and temperature of the gas decrease and liquefy, and the gas-liquid mixture may enter the gap of the bearing, which may cause the bearing to fail to operate reliably.

Summary of the Invention

Problems to be Solved by the Invention

[0003] An object of the present invention is to provide a heat exchange type dehumidifying static pressure air bearing to solve the problem in 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

[0004] The present invention provides a heat exchange type dehumidifying static pressure air bearing, which comprises 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 inserted through the bearing holder, an annular throttle located outside the rotating shaft, positioned within the cavity, and serving to lower the temperature by throttling a medium, having a first gap with the rotating shaft, the first gap forming an exhaust passage through the bearing holder, an annular throttle, a plurality of heat exchange tubes built in the annular throttle and annularly installed along a circumferential direction of the annular throttle, and a heat exchange medium flowing in the heat exchange tubes for heating and vaporizing a liquid phase in the medium with a lowered temperature.

[0005] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, the annular throttle is made of a material having a porous structure.

[0006] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, a plurality of first through holes are provided on a wall surface of the annular throttle for throttling the medium to lower the temperature.

[0007] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, the annular throttle is a non-metallic annular throttle.

[0008] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, the plurality of heat exchange tubes are annularly provided along the circumferential direction of the annular throttle to form a heat exchange layer, the number of the heat exchange layers is multiple, and there is a pitch between two adjacent heat exchange layers.

[0009] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, the temperature of the heat exchange medium in the heat exchange layer adjacent to the first gap is higher than the temperature of the heat exchange medium in each other heat exchange layer.

[0010] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, a first pipeline for injecting the heat exchange medium is further provided, which communicates with the first end of the multilayer heat exchange layer, and a second pipeline for discharging the heat exchange medium is further provided, which communicates with the second end of the multilayer heat exchange layer.

[0011] According to the heat exchange type dehumidifying static pressure air bearing provided by 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 inserted. In order to form the exhaust passage, the diameter of the second through hole is larger than the diameter of the rotating shaft. The first pipeline and the second pipeline penetrate through the end cap and extend to the outside of the end cap.

[0012] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, a pair of closing plates respectively provided at both ends of the annular throttle are further included. Both ends of each heat exchange tube penetrate through the closing plate respectively and communicate with the first pipeline or the second pipeline. Each closing plate is provided with a third through hole having a diameter equal to the diameter of the second through hole.

[0013] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, a second gap is formed between the annular throttle and the bearing holder, and the second gap forms an intake passage communicating with the intake pipe.

Effects of the Invention

[0014] According to the heat exchange type dehumidifying static pressure air bearing provided by the present invention, due to the installation of the annular throttle and the plurality of heat exchange tubes, the throttle effect reduces the temperature and pressure of the medium. At the same time, the heat exchange tubes heat the liquid phase in the medium to vaporize it into gas. In the operation process of the static pressure air bearing, it is avoided that the static pressure air bearing cannot operate stably due to liquid entering the first gap, and the reliability of the operation of the static pressure air bearing is improved.

Brief Description of the Drawings

[0015] To more clearly explain the technical solutions of the present invention or the prior art, the following briefly introduces the drawings necessary for the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention, and for those skilled in the art, it is possible to obtain other drawings based on these drawings without creative efforts.

Figure 1

Figure 2

Embodiments for Carrying out the Invention

[0016] To make the objectives, technical solutions and advantages of the present invention clearer, the following clearly and completely describes the technical solutions in the present invention with reference to the drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0017] The components limited by the terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such components. In the description of the present invention, unless otherwise explained, "a plurality" means two or more.

[0018] The following describes the heat exchange type dehumidifying static pressure air bearing in the present invention with reference to FIGS. 1 and 2.

[0019] As shown in FIG. 1, in the embodiment of the present invention, the heat exchange type dehumidifying hydrostatic air bearing includes a bearing holder 10, a rotating shaft 20, an annular throttle 30, and a plurality of heat exchange tubes 40. A cavity is provided inside the bearing holder 10, and an intake pipe 60 communicating with the cavity is provided on the outer surface of the bearing holder 10. The rotating shaft 20 passes through the bearing holder 10. The annular throttle 30 is externally fitted outside the rotating shaft 20. The annular throttle 30 is located in the cavity. The annular throttle 30 has a first gap 101 between it and the rotating shaft 20. The first gap 101 penetrates the bearing holder 10 to form an exhaust passage. The annular throttle 30 serves to lower the temperature by throttling the medium. The plurality of heat exchange tubes 40 are built into the annular throttle 30 and are annularly installed along the circumferential direction of the annular throttle 30. A heat exchange medium flows in the heat exchange tubes 40. The heat exchange medium is for heating and vaporizing the liquid phase in the medium with a lowered temperature.

[0020] Specifically, in the embodiment of the present invention, the number of the intake pipes 60 may be plural. The plurality of intake pipes 60 are annularly installed along the circumferential surface of the bearing holder 10. The intake pipes 60 are for allowing the medium to enter the cavity of the bearing holder 10. In this embodiment, the medium used is a gas phase medium or a gas-liquid medium that is easily liquefied. When the medium passes through the annular throttle 30, a throttling effect occurs, the pressure and temperature of the medium decrease, and a part of the gas phase in the medium may be liquefied into a liquid. Then, the medium passes through the heat exchange tubes 40. The temperature of the heat exchange medium in the heat exchange tubes 40 is higher than the temperature of the medium. By the heat exchange medium exchanging heat with the medium, the medium is heated, the liquid phase in the medium is vaporized into a gas, and the medium becomes a pure gas. The medium passes through the annular throttle 30 again, and its pressure and temperature decrease, but no liquefaction phenomenon occurs. In that case, the medium becomes a pure gas medium. The gas is discharged from the first gap 101 between the annular throttle 30 and the rotating shaft 20, thus avoiding the situation that after the liquid enters the first gap 101 of the hydrostatic air bearing, the hydrostatic air bearing cannot operate normally and stably.

[0021] Furthermore, in this embodiment, the annular throttle 30 is for reducing the pressure and temperature of the high-temperature and high-pressure medium entering the bearing holder 10 so that the pressure of the medium meets the design requirements of the hydrostatic air bearing. By making the temperature of the heat exchange medium in the heat exchange tube 40 as high as possible, the liquid phase in the medium is completely vaporized into gas. After the medium passes through the annular throttle 30 again, its temperature and pressure decrease, but it is ensured that the medium will not liquefy, and furthermore, the generation of liquid in the medium is avoided.

[0022] Optionally, in the embodiment of the present invention, the heat exchange medium may be a high-temperature gas. In this embodiment, the heat exchange medium is the medium of the hydrostatic air bearing. Since the medium has the characteristics of high temperature and high pressure in the initial state, the medium with decreased temperature can be heated and vaporized. At the same time, there is no need to provide unnecessary heat exchange medium, and the energy consumption is reduced.

[0023] In the heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention, due to the installation of the annular throttle and the plurality of heat exchange tubes, by the throttling effect, while reducing the temperature and pressure of the medium, the liquid phase in the medium is heated and vaporized into gas by the heat exchange type tube. In the operation process of the hydrostatic air bearing, it is avoided that the hydrostatic air bearing cannot operate stably due to the liquid entering the first gap, and the certainty of the operation of the hydrostatic air bearing is improved.

[0024] As shown in FIG. 1, in an embodiment of the present invention, the annular throttle 30 is made of a material having a porous structure. Specifically, the annular throttle 30 may have a structure made of a more porous material and has microvoids. When the medium passes through the microvoids, the microvoids exert a throttling effect on the medium, so that the temperature and pressure of the medium decrease. In that process, a part of the gas phase in the medium may be liquefied into liquid. Optionally, the material having a porous structure may be porous ceramics or a carbon material.

[0025] Alternatively, in another embodiment of the present invention, a plurality of first through holes are provided on the wall surface of the annular aperture 30. Specifically, in this embodiment, the annular aperture 30 may be an annular member having a plurality of micro through holes on the wall surface. The micro through holes can play a role in increasing the flow resistance of the medium, so that the throttling effect can be obtained, and the temperature and pressure of the medium can be reduced.

[0026] Furthermore, in an embodiment of the present invention, the annular aperture 30 is preferably a non-metallic annular aperture. Since the non-metallic annular aperture has poor thermal conductivity, when the heat exchange tube 40 exchanges heat with the medium, the heat conduction ability of the annular aperture 30 is not good, so it is possible to effectively exert the functions of temperature drop and pressure drop.

[0027] As shown in FIG. 1, in an embodiment of the present invention, a plurality of heat exchange tubes 40 are annularly provided along the circumferential direction of the annular aperture 30 to form a heating layer. The number of heating layers is multiple, and there is a pitch between two adjacent heating layers.

[0028] Specifically, a plurality of heat exchange layers are built into the annular aperture 30, and there is a pitch between two adjacent heat exchange layers. In this way, a structure is formed in which the throttle layer and the heat exchange layer are alternately laminated. Each throttle layer is for reducing the temperature and pressure of the medium, and each heat exchange layer is for heating the medium with a lowered temperature to vaporize the liquid phase in the medium into gas, and to ensure that the medium becomes a pure gas medium after passing through each heating layer. In this embodiment, according to the multiple throttle layers, the pressure of the medium can be lowered to meet the design requirements of the hydrostatic air bearing. According to the multiple heat exchange layers, it is ensured that the medium entering the first gap 101 is a pure gas medium, and it is also ensured that the hydrostatic air bearing can operate stably.

[0029] Furthermore, in an embodiment of the present invention, the number of heat exchange tubes 40, the material and size of the heat exchange tubes 40 in each heating layer may be set based on the specific parameters of the hydrostatic air bearing.

[0030] In the heat exchange type dehumidifying static pressure air bearing provided by the embodiment of the present invention, a plurality of heat exchange layers are built into the annular throttle, so that the annular throttle forms a structure in which a plurality of throttle layers and a plurality of heat exchange layers are alternately arranged. Thereby, in the process of flowing, the medium undergoes temperature drop and pressure drop treatment multiple times, so that the pressure of the static pressure air bearing is ensured to be normal, and the temperature of the static pressure air bearing is locally too high, which affects the service life of the static pressure air bearing. This has been avoided. In addition, since heating is performed multiple times, each time the medium passes through one heat exchange layer, the liquid phase in the medium is vaporized into gas, and the medium becomes pure gas, so that liquid enters the first gap of the static pressure air bearing. This has been avoided, and the reliability of the operation of the static pressure air bearing has been ensured.

[0031] As shown in FIG. 1, in the embodiment of the present invention, the heat exchange type dehumidifying static pressure air bearing further includes a first pipeline 51 and a second pipeline 52. The first pipeline 51 communicates with the first end of the multi-layer heat exchange layer, and the first pipeline 51 is for injecting a heat exchange medium. The second pipeline 52 communicates with the second end of the multi-layer heat exchange layer, and the second pipeline 52 is for discharging the heat exchange medium.

[0032] Specifically, the first pipeline 51 communicates with the first end of the heat exchange tube 40 of each layer, and the second pipeline 52 communicates with the second end of the heat exchange tube 40 of each layer. The heat exchange medium enters the heat exchange tube 40 of each layer through the first pipeline 51, and after performing heat exchange with the medium, the heat exchange medium is discharged from the second pipeline 52.

[0033] In the embodiment of the present invention, the temperature of the heat exchange medium in the heat exchange layer adjacent to the first gap 101 is higher than the temperature of the heat exchange medium in each other heat exchange layer.

[0034] Specifically, in the embodiment shown in FIG. 1, the number of heat exchange layers is two, the number of throttle layers is three, the heat exchange layer away from the first gap 101 is the first heat exchange layer, and the heat exchange layer close to the first gap 101 is the second heat exchange layer. In this embodiment, the temperatures of the heat exchange media in the heat exchange tubes 40 in the first heat exchange layer and the second heat exchange layer are both higher than the temperature of the medium whose temperature has dropped. By doing so, after heating the medium, the liquid phase in the medium is vaporized into a gas. However, since the medium needs to further pass through the throttle layer after passing through the second heat exchange layer to cause a temperature drop and a pressure drop, by making the temperature of the heat exchange media in each heat exchange tube 40 in the second heat exchange layer as high as possible, even after the medium passes through the last throttle layer, it is ensured that the medium is still a pure gas medium, and the presence of liquid in the medium is avoided.

[0035] Furthermore, in this embodiment, the heat exchange type dehumidifying static pressure air bearing includes two pairs of first pipelines 51 and second pipelines 52. One pair of first pipelines 51 and second pipelines 52 communicate with both ends of the first heat exchange layer, and the other pair of first pipelines 51 and second pipelines 52 communicate with both ends of the second heat exchange layer. In this way, the temperatures of the heat exchange media in the first heat exchange layer and the second heat exchange layer are different.

[0036] As shown in FIG. 1, in the embodiment of the present invention, a second gap 102 is formed between the annular throttle 30 and the inner wall of the bearing holder 10, and an intake passage communicating with the intake pipe 60 is formed in the second gap 102.

[0037] 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. Each end cap 12 is provided with a second through hole through which the rotating shaft 20 is inserted. In order to form an exhaust passage, the diameter of the second through hole is made larger than the diameter of the rotating shaft 20. The first pipeline 51 and the second pipeline 52 penetrate through the end cap 12 and extend to the outside of the end cap 12.

[0038] Specifically, the pair of end caps 12 are respectively installed at both ends of the annular member 11, so that there is a cavity inside the bearing holder 10. The annular throttle 30 is located in the cavity. The annular throttle 30 has a second gap 102 between it and the annular member 11, and the second gap 102 forms an intake passage. Since the diameter of the central hole of the annular throttle 30 is equal to the diameter of the second through hole of the end cap 12, an exhaust passage passing through the bearing holder 10 is formed. The first pipeline 51 and the second pipeline 52 penetrate through the end cap 12 and extend to the outside of the end cap 12.

[0039] Furthermore, as shown in FIG. 2, in the embodiment of the present invention, the heat exchange type dehumidifying static pressure air bearing further includes a pair of closing plates 70 respectively provided at both ends of the annular throttle 30. Both ends of each heat exchange tube 40 penetrate through the closing plate 70 and communicate with the first pipeline 51 or the second pipeline 52. Each closing plate 70 is provided with a third through hole having a diameter equal to the diameter of the second through hole.

[0040] Specifically, a closing plate 70 is provided on each of the two end faces of the annular throttle 30. The closing plate 70 isolates the heat exchange medium in the first pipeline 51 and the second pipeline 52 from the annular throttle 30. When the heat exchange medium enters the heat exchange tube 40 or enters the second pipeline 52 through the heat exchange tube 40, the heat exchange medium penetrates into the annular throttle 30 from the end face of the annular throttle 30 to heat the medium, thereby avoiding the annular throttle 30 from losing its functions of temperature drop and pressure drop.

[0041] The heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention has a simple dehumidification system structure, makes full use of the existing bearing structure, and the heating gas is from the gas supplied to the bearing. During the operation process, dehumidification is automatically performed, so there is no need to additionally add a heating device, thus reducing the manufacturing cost. At the same time, the heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention has an excellent dehumidification effect, the maximum temperature of the medium is controllable, the throttling and heating processes of the medium are divided into multiple stages. In each stage, after the temperature drops due to the annular throttle, it is heated by the heat exchange tube, so the total heat receiving area becomes larger and it can be heated uniformly, and the liquid phase in the medium can be effectively removed. Moreover, during the process, by performing the process of first lowering the temperature of the medium and then heating it multiple times on the medium, it is avoided that the temperature of the bearing structure is too high locally and affects the service life of the hydrostatic air bearing.

[0042] Finally, it should be noted that the above embodiments are not for limiting the technical solutions of the present invention, but only for explanation. While the present invention has been described in detail with reference to the above embodiments, as can be understood by those of ordinary skill in the art, still, the technical solutions described in each of the above embodiments can be modified, or equivalent substitutions can be made for some of the components therein. Moreover, even if those modifications or substitutions are made, the corresponding technical solutions do not essentially depart from the spirit and scope of the technical solutions of each embodiment of the present invention.

Description of Reference Numerals

[0043] 10 Bearing holder, 11 Annular member, 12 End cap, 20 Rotating shaft, 30 Annular throttle, 40 Heat exchange tube, 51 First pipeline, 52 Second pipeline, 60 Intake pipe, 70 Closing plate, 101 First gap, 102 Second gap.

Claims

1. a bearing holder having a cavity formed therein and an intake pipe formed on an outer surface thereof and communicating with the cavity; A rotating shaft inserted into the bearing holder; an annular throttle that is fitted onto the outside of the rotating shaft, is located within the cavity, and serves to reduce a temperature by throttling a medium, the annular throttle having a first gap between itself and the rotating shaft, the first gap penetrating the bearing holder to form an exhaust passage; a plurality of heat exchange tubes that are incorporated in the annular throttle and are disposed annularly along a circumferential direction of the annular throttle; A heat exchange medium flows through the heat exchange tube for heating and vaporizing the liquid phase of the medium whose temperature has been reduced. A heat exchange type dehumidifying hydrostatic air bearing.

2. The annular aperture is made of a material having a porous structure.

2. The heat exchange type dehumidifying hydrostatic air bearing according to claim 1.

3. A wall surface of the annular throttle is provided with a plurality of first through holes for reducing the temperature of the medium by throttling the medium.

2. The heat exchange type dehumidifying hydrostatic air bearing according to claim 1.

4. The annular diaphragm is a non-metallic annular diaphragm.

2. The heat exchange type dehumidifying hydrostatic air bearing according to claim 1.

5. The heat exchange tubes are arranged annularly along the circumferential direction of the annular throttle to form a heat exchange layer, The number of the heat exchange layers is multiple, There is a pitch between two adjacent heat exchange layers.

2. The heat exchange type dehumidifying hydrostatic air bearing according to claim 1.

6. a temperature of the heat exchange medium in the heat exchange layer adjacent to the first gap is greater than a temperature of the heat exchange medium in each of the other heat exchange layers; 6. The heat exchange type dehumidifying hydrostatic air bearing according to claim 5.

7. a first pipe communicating with a first end of the multi-layer heat exchange layer for injecting the heat exchange medium; a second pipe communicating with a second end of the multi-layer heat exchange layer for discharging the heat exchange medium; 6. The heat exchange type dehumidifying hydrostatic air bearing according to claim 5.

8. The bearing holder includes an annular member and a pair of end caps, The pair of end caps are respectively installed on both ends of the ring member, Each of the end caps is provided with a second through hole through which the rotation shaft is inserted, In order to form the exhaust passage, a diameter of the second through hole is larger than a diameter of the rotating shaft, The first pipe and the second pipe pass through the end cap and extend to the outside of the end cap.

8. The heat exchange type dehumidifying hydrostatic air bearing according to claim 7.

9. The annular throttle further includes a pair of closure plates provided at both ends thereof, Both ends of each of the heat exchange tubes pass through the blocking plate and communicate with the first pipe line or the second pipe line, Each of the closure plates is provided with a third through hole having a diameter equal to the diameter of the second through hole.

9. The heat exchange type dehumidifying hydrostatic air bearing according to claim 8.

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

2. The heat exchange type dehumidifying hydrostatic air bearing according to claim 1.

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