Heat exchange type dehumidifying 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 more particularly to a heat exchange type dehumidifying hydrostatic air bearing. [Background technology]

[0002] Bearings are one of the core components of power machinery. Hydrostatic air bearings have strong load-bearing capacity and can use high-pressure gas inside the power system as the bearing medium. The bearing medium has good compatibility with the system, and compared to conventional oil-lubricated bearings, it can eliminate the oil supply system and reduce bearing friction loss, thereby simplifying the power system and improving energy efficiency. In some power systems, such as steam systems in nuclear power plants, water vapor liquefies and turns into water droplets during throttling and expansion. If such a medium is used as the medium for a hydrostatic air bearing, the gas pressure and temperature will decrease during the throttling process, causing it to liquefy. This gas-liquid mixture may enter the bearing gap, preventing the bearing from operating reliably. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention aims to provide a heat exchange type dehumidifying hydrostatic air bearing, thereby eliminating the drawback of the prior art in that the gas-liquid mixture liquefies and turns into water droplets during the throttling and expansion process, preventing the bearing from operating reliably. [Means for solving the problem]

[0004] The present invention provides a heat exchange type dehumidifying hydrostatic air bearing comprising: a bearing holder having an internal cavity and an intake pipe on its outer surface which communicates with the cavity; a rotating shaft inserted into the bearing holder; an annular throttle fitted around the outside of the rotating shaft and located within the cavity, the annular throttle serving to reduce the temperature by restricting the medium, the annular throttle having a first gap between itself and the rotating shaft, the first gap passing through the bearing holder to form an exhaust passage; and a plurality of heat exchange tubes built into the annular throttle and arranged annularly circumferentially around the annular throttle, wherein a heat exchange medium flows through the heat exchange tubes to heat and vaporize the liquid phase of the medium whose temperature has been reduced.

[0005] According to the heat exchange type dehumidifying hydrostatic 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 hydrostatic air bearing provided by the present invention, a plurality of first through holes are provided in the wall surface of the annular throttle, which serves to reduce the temperature of the medium by throttling it.

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

[0008] According to the heat exchange type dehumidifying hydrostatic air bearing provided by the present invention, the heat exchange tubes are arranged in a ring shape along the circumferential direction of the annular orifice 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 hydrostatic 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 of the other heat exchange layers.

[0010] The heat exchange type dehumidifying hydrostatic air bearing provided by the present invention further comprises a first pipe line communicating with a first end of the multi-layer heat exchange layer for injecting the heat exchange medium, and a second pipe line communicating with a second end of the multi-layer heat exchange layer for discharging the heat exchange medium.

[0011] According to the heat exchange type dehumidifying hydrostatic air bearing provided by the present invention, the bearing holder includes a ring-shaped device and a pair of end caps, each of which is installed at both ends of the ring-shaped device. Each of the end caps has 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 pipe line and the second pipe line pass through the end caps and extend to the outside of the end caps.

[0012] The heat exchange type dehumidifying hydrostatic air bearing provided by the present invention further includes a pair of blocking plates provided at both ends of the annular throttle, and both ends of each of the heat exchange tubes pass through the blocking plates and communicate with the first pipe line or the second pipe line, and each of the blocking plates is provided with a third through hole having a diameter equal to that of the second through hole.

[0013] According to the heat exchange type dehumidifying hydrostatic 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] In the heat exchange type dehumidifying hydrostatic air bearing provided by the present invention, an annular throttle and multiple heat exchange tubes are installed, which reduce the temperature and pressure of the medium through the throttle effect, and at the same time, the heat exchange tubes heat the liquid phase in the medium and evaporate it into gas. This prevents liquid from entering the first gap during the operation of the hydrostatic air bearing, which could prevent the hydrostatic air bearing from operating stably, and improves the reliability of the operation of the hydrostatic air bearing. [Brief explanation of the drawings]

[0015] In order to more clearly explain the technical solutions of the present invention or the prior art, the following briefly introduces drawings necessary for describing the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Figure 1] 1 is a structural schematic diagram of a heat exchange type dehumidifying hydrostatic air bearing provided by the present invention; [Figure 2] FIG. 2 is a side view of the heat exchange tube shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain all other embodiments without any creative effort, and all other embodiments will fall within the protection scope of the present invention.

[0017] In the specification and claims of this application, elements defined by the terms "first" and "second" may include one or more of the elements, either explicitly or implicitly. In the description of this invention, unless otherwise stated, "plurality" means two or more than two.

[0018] The heat exchange type dehumidifying hydrostatic air bearing of the present invention will be described below with reference to FIGS.

[0019] 1, in an embodiment of the present invention, a heat exchange type dehumidifying hydrostatic 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 is inserted through the bearing holder 10, and the annular throttle 30 is fitted onto the outside of the rotating shaft 20 and located within the cavity, with a first gap 101 between the annular throttle 30 and the rotating shaft 20. The first gap 101 passes through the bearing holder 10 to form an exhaust passage, and the annular throttle 30 serves to reduce the temperature by restricting the medium. The heat exchange tubes 40 are built into the annular orifice 30 and are arranged in a ring shape along the circumferential direction of the annular orifice 30. A heat exchange medium flows through the heat exchange tubes 40 and heats and vaporizes the liquid phase of the medium whose temperature has been reduced.

[0020] Specifically, in this embodiment of the present invention, the number of intake pipes 60 may be multiple. The multiple intake pipes 60 are arranged annularly along the circumferential surface of the bearing holder 10, and the intake pipes 60 are used to introduce a medium into the cavity of the bearing holder 10. In this embodiment, a gaseous medium or a gas-liquid medium that is easily liquefied is used as the medium. When the medium passes through the annular orifice 30, a throttling effect occurs, causing the pressure and temperature of the medium to decrease, and some of the gas phase of the medium may liquefy into a liquid. The medium then passes through the heat exchange tube 40, where the temperature of the heat exchange medium in the heat exchange tube 40 is higher than that of the medium. The heat exchange medium exchanges heat with the medium, heating the medium and causing the liquid phase of the medium to evaporate into a gas, resulting in the medium becoming a pure gas. The medium then passes through the annular orifice 30 again, reducing its pressure and temperature but preventing liquefaction. In this case, the medium becomes a pure gas medium, and the gas is discharged from the first gap 101 between the annular throttle 30 and the rotating shaft 20, thereby preventing liquid from entering the first gap 101 of the hydrostatic air bearing, which would prevent the hydrostatic air bearing from operating normally and stably.

[0021] Furthermore, in this embodiment, the annular orifice 30 reduces the pressure and temperature of the high-temperature, high-pressure medium contained in the bearing holder 10, thereby ensuring that the medium pressure meets the design requirements of the hydrostatic air bearing. By raising the temperature of the heat exchange medium in the heat exchange tube 40 as much as possible, the liquid phase of the medium is completely vaporized into gas, and after the medium passes through the annular orifice 30 again, its temperature and pressure are reduced, but it is ensured that it does not liquefy, and furthermore, the generation of liquid in the medium is prevented.

[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 a hydrostatic air bearing medium, which has the characteristics of high temperature and high pressure in the initial state, so that the medium whose temperature has dropped can be heated and vaporized, and at the same time, there is no need to provide an additional heat exchange medium, thereby reducing energy consumption.

[0023] In the heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention, an annular throttle and multiple heat exchange tubes are installed, which reduce the temperature and pressure of the medium through the throttle effect, and at the same time, the heat exchange tubes heat the liquid phase in the medium to evaporate it into gas. This prevents liquid from entering the first gap during the operation of the hydrostatic air bearing, preventing the hydrostatic air bearing from operating stably, and improves the reliability of the operation of the hydrostatic air bearing.

[0024] As shown in FIG. 1 , in one embodiment of the present invention, the annular restrictor 30 is made of a material with a porous structure. Specifically, the annular restrictor 30 may be made of a more sparse material and have microvoids. When the medium passes through the microvoids, the microvoids exert a restricting effect on the medium, thereby reducing the temperature and pressure of the medium. In this process, some of the gas phase in the medium may be liquefied into a liquid. Alternatively, the material with a porous structure may be a porous ceramic or a carbon material.

[0025] Optionally, in another embodiment of the present invention, a plurality of first through holes are provided in the wall surface of the annular throttle 30. Specifically, in this embodiment, the annular throttle 30 may be an annular device having a plurality of minute through holes in the wall surface. The minute through holes can serve to increase the flow resistance of the medium, thereby achieving a throttle effect and reducing the temperature and pressure of the medium.

[0026] Furthermore, in the embodiment of the present invention, the annular orifice 30 is preferably a non-metallic annular orifice, since the non-metallic annular orifice has poor thermal conductivity, when the heat exchange tube 40 exchanges heat with the medium, the annular orifice 30 has poor thermal conductivity, so it can effectively perform the functions of lowering temperature and lowering pressure.

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

[0028] Specifically, multiple heat exchange layers are built into the annular throttle 30, with a pitch between two adjacent heat exchange layers. This results in a structure in which throttle layers and heat exchange layers are alternately stacked. Each throttle layer reduces the temperature and pressure of the medium. Each heat exchange layer heats the cooled medium, vaporizing the liquid phase of the medium into gas and ensuring that the medium becomes a pure gaseous medium after passing through each heating layer. In this embodiment, the multiple throttle layers allow the pressure of the medium to be reduced to meet the design requirements of the hydrostatic air bearing. The multiple heat exchange layers ensure that the medium entering the first gap 101 is a pure gaseous medium, ensuring stable operation of the hydrostatic air bearing.

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

[0030] In the heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention, multiple heat exchange layers are built into the annular throttle, forming a structure in which multiple throttle layers and multiple heat exchange layers are alternately installed. As a result, the medium undergoes temperature and pressure reduction processes multiple times during the flow process, ensuring that the pressure of the hydrostatic air bearing is normal and preventing the hydrostatic air bearing from becoming locally overheated, which would affect its service life. In addition, because the medium is heated multiple times, the liquid phase in the medium is vaporized into gas each time it passes through a heat exchange layer, turning the medium into pure gas. This prevents liquid from entering the first gap of the hydrostatic air bearing, ensuring reliable operation of the hydrostatic air bearing.

[0031] 1, in an embodiment of the present invention, the heat exchange type dehumidifying hydrostatic air bearing further includes a first pipe 51 and a second pipe 52. The first pipe 51 is connected to a first end of the multi-layer heat exchange layer and is used to inject a heat exchange medium. The second pipe 52 is connected to a second end of the multi-layer heat exchange layer and is used to discharge the heat exchange medium.

[0032] Specifically, the first pipeline 51 is connected to the first ends of the heat exchange tubes 40 in each layer, and the second pipeline 52 is connected to the second ends of the heat exchange tubes 40 in each layer. The heat exchange medium enters the heat exchange tubes 40 in each layer through the first pipeline 51, and after exchanging heat with the medium, the heat exchange medium is discharged from the second pipeline 52.

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

[0034] Specifically, in the embodiment shown in FIG. 1 , there are two heat exchange layers and three throttling layers. The heat exchange layer farthest from the first gap 101 is the first heat exchange layer, and the heat exchange layer closest to the first gap 101 is the second heat exchange layer. In this embodiment, the temperatures of the heat exchange medium in the heat exchange tubes 40 in the first and second heat exchange layers are both higher than the temperature of the cooled medium. This allows the medium to be heated and then vaporized from its liquid phase into a gas. However, since the medium must pass through an additional throttling layer after passing through the second heat exchange layer to reduce its temperature and pressure, the temperature of the heat exchange medium in each heat exchange tube 40 in the second heat exchange layer is kept as high as possible to ensure that the medium remains a pure gas even after passing through the final throttling layer, avoiding the presence of liquid in the medium.

[0035] Furthermore, in this embodiment, the heat exchange type dehumidifying static pressure air bearing includes two pairs of first pipes 51 and second pipes 52, one pair of the first pipes 51 and second pipes 52 connected to both ends of the first heat exchange layer, and the other pair of the first pipes 51 and second pipes 52 connected to both ends of the second heat exchange layer, so that 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 orifice 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 an embodiment of the present invention, the bearing holder 10 includes a ring-shaped member 11 and a pair of end caps 12, each of which is installed at both ends of the ring-shaped 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 larger than the diameter of the rotating shaft 20. The first pipe line 51 and the second pipe line 52 pass 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 on both ends of the annular fitting 11, thereby forming a cavity inside the bearing holder 10, and the annular orifice 30 is located in this cavity, with a second gap 102 between the annular orifice 30 and the annular fitting 11, which second gap 102 forms an intake passage. The diameter of the central hole of the annular orifice 30 is equal to the diameter of the second through hole of the end cap 12, so an exhaust passage is formed that passes through the bearing holder 10. The first pipe line 51 and the second pipe line 52 pass through the end cap 12 and extend to the outside of the end cap 12.

[0039] Furthermore, as shown in FIG. 2, in an embodiment of the present invention, the heat exchange type dehumidifying hydrostatic air bearing further includes a pair of blocking plates 70 provided at both ends of the annular orifice 30, respectively, and both ends of each heat exchange tube 40 pass through the blocking plates 70 and communicate with the first pipe line 51 or the second pipe line 52, respectively, and each blocking plate 70 is provided with a third through hole having a diameter equal to the diameter of the second through hole.

[0040] Specifically, a blocking plate 70 is provided on each of the two end faces of the annular orifice 30, and the blocking plate 70 isolates the heat exchange medium in the first pipe line 51 and the second pipe line 52 from the annular orifice 30. When the heat exchange medium enters the heat exchange tube 40 or enters the second pipe line 52 via the heat exchange tube 40, the heat exchange medium penetrates into the annular orifice 30 from the end face thereof and heats the medium, thereby preventing the annular orifice 30 from being unable to perform its temperature and pressure reduction functions.

[0041] The heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention has a simple dehumidifying system structure, fully utilizes the existing structure of the bearing, and the heating gas comes from the gas supplied to the bearing, so dehumidification is automatic during operation and there is no need to add an additional heating device, thereby reducing manufacturing costs. At the same time, the heat exchange type dehumidifying hydrostatic air bearing provided by the embodiment of the present invention has an excellent dehumidifying effect, the maximum temperature of the medium is controllable, and the throttling and heating process for the medium is divided into multiple stages, and in each stage, the temperature is reduced by the annular throttling and then heated by the heat exchange tube, so the total heat-receiving area is large and heat is absorbed uniformly, effectively removing the liquid phase in the medium. Moreover, during this process, the medium first undergoes the temperature reduction and then heating process multiple times, which avoids localized high temperatures in the bearing structure and thereby affecting the service life of the hydrostatic air bearing.

[0042] Finally, it should be noted that the above embodiments are for illustrative purposes only, and not for limiting the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still understand that the technical solutions described in the above embodiments can be modified or some of the components therein can be substituted with equivalents. Moreover, even if such modifications or substitutions are made, the corresponding technical solutions will not essentially deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. [Explanation of symbols]

[0043] 10 bearing holder, 11 annular fitting, 12 end cap, 20 rotating shaft, 30 annular restriction, 40 heat exchange tube, 51 first pipe line, 52 second pipe line, 60 intake pipe, 70 blocking 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 through the bearing holder; an annular throttle fitted onto the outside of the rotating shaft, located within the cavity, and configured 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 within the annular throttle and are disposed annularly along the circumferential direction of the annular throttle, A heat exchange medium flows through the heat exchange tubes to heat and vaporize the liquid phase of the medium whose temperature has been reduced. A heat exchange type dehumidifying hydrostatic air bearing characterized by the above.

2. The annular diaphragm 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 restricting the flow of 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 plurality of 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. 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 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 heat exchange layer and for injecting the heat exchange medium; a second pipe communicating with a second end of the 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 a ring and a pair of end caps, The pair of end caps are respectively installed on both ends of the annular 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, the diameter of the second through hole is larger than the diameter of the rotary 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, respectively; 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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