Electrically heated dehumidifying hydrostatic air bearing

Abstract

To provide a hydrostatic air bearing which enables improvement of reliability of operation.SOLUTION: An electric heating type dehumidification hydrostatic air bearing includes a bearing holder 10, a rotary shaft 20, an annular orifice 30, and a plurality of heating rods 40. In the bearing holder, a cavity is provided therein. A suction pipe 70 communicating with the cavity is provided on an outer surface. The annular orifice is fitted on an exterior of the rotary shaft and forms a first gap 101 with the rotary shaft. The annular orifice constricts flow of a medium to decrease a temperature. The heating rods are incorporated into the annular orifice, installed in an annular shape along a circumferential direction of the annular orifice, and heat and vaporize a liquid phase of the medium whose temperature is decreased.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of bearings, and more particularly to electrically heated dehumidifying hydrostatic air bearings. [Background technology]

[0002] Bearings are one of the core components of power machinery. For example, Patent Document 1 discloses an aerostatic bearing. Aerostatic bearings have a high load-bearing capacity, and the high-pressure gas inside the power system may be used as the bearing medium. The bearing medium is compatible with the system, and compared with 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, steam liquefies and turns into water droplets during throttling and expansion. If such a medium is used as the medium for an aerostatic bearing, the pressure and temperature of the gas decrease during the throttling process, causing it to liquefy. This could lead to a gas-liquid mixture entering the bearing gap, preventing the bearing from operating reliably. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-300576 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide an electrically heated dehumidifying hydrostatic air bearing that overcomes the drawback of the prior art in that the gas-liquid mixture liquefies into droplets during throttling and expansion, preventing the bearing from operating reliably. [Means for solving the problem]

[0005] The present invention provides an electrically heated 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, which serves 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 heating rods built into the annular throttle and arranged annularly circumferentially around the annular throttle, which heats and vaporizes the liquid phase of the medium whose temperature has been reduced.

[0006] According to the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, the annular restrictor is made of a material having a porous structure.

[0007] According to the electrically heated 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.

[0008] According to the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, the annular restrictor is a non-metallic annular restrictor.

[0009] According to the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, the plurality of heating rods are arranged in a ring shape along the circumferential direction of the annular orifice to form a heating layer, the number of heating layers is multiple, and there is a pitch between two adjacent heating layers.

[0010] According to the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, it further includes a first variable resistor, which is electrically connected to a plurality of the heating rods, and the first variable resistor is used to adjust the power of the heating rods.

[0011] The electrically heated dehumidifying hydrostatic air bearing provided by the present invention further includes a second variable resistor electrically connected to the heating layer adjacent to the first gap, and a third variable resistor electrically connected to each of the remaining heating layers.

[0012] According to the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, both ends of the plurality of heating rods are connected by leads, and then connected to the first variable resistor.

[0013] According to the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, a second gap is formed between the annular throttle and the inner wall of the bearing holder, and the second gap forms an intake passage communicating with the intake pipe.

[0014] According to the electrically heated 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. The diameter of the second through hole is larger than the diameter of the rotating shaft to form the exhaust passage. [Effects of the Invention]

[0015] In the electrically heated dehumidifying hydrostatic air bearing provided by the present invention, an annular throttle and multiple heating rods are installed, which reduce the temperature and pressure of the medium through the throttle effect, and the heating rods 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. [Brief explanation of the drawings]

[0016] In order to more clearly explain the technical solutions of the present invention or the prior art, the following briefly introduces the accompanying drawings necessary for describing 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 any creative efforts. [Figure 1] 1 is a structural schematic diagram of an electrically heated dehumidifying hydrostatic air bearing provided by the present invention; [Figure 2] FIG. 2 is a side view of the heating rod shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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 accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and are 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 scope of protection of the present invention.

[0018] 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.

[0019] The electrically heated dehumidifying hydrostatic air bearing of the present invention will be described below with reference to FIGS.

[0020] As shown in FIG. 1 , in this embodiment of the present invention, an electrically heated dehumidifying hydrostatic bearing includes a bearing holder 10, a rotating shaft 20, an annular throttle 30, and multiple heating rods 40. A cavity is formed inside the bearing holder 10, and an intake pipe 70 communicating with the cavity is provided on the outer surface of the bearing holder 10. The rotating shaft 20 is inserted into the bearing holder 10, and the annular throttle 30 is fitted onto the outside of the rotating shaft 20 and located within the cavity. A first gap 101 is formed between the annular throttle 30 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 reduce the temperature by restricting the medium. Multiple heating rods 40 are built into the annular throttle 30 and are arranged annularly along the circumferential direction of the annular throttle 30. The heating rods 40 heat and vaporize the liquid phase in the reduced-temperature medium.

[0021] Specifically, in this embodiment of the present invention, the number of intake pipes 70 may be multiple. The multiple intake pipes 70 are arranged annularly along the circumferential surface of the bearing holder 10, and the intake pipes 70 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, reducing the pressure and temperature of the medium and potentially liquefying some of the gas phase of the medium to a liquid. The medium then passes through the heating rod 40, which heats the medium, evaporating the liquid phase of the medium to a gas, and the medium becomes a pure gas. When the medium passes through the annular orifice 30 again, its pressure and temperature decrease, but liquefaction does not occur. 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.

[0022] Furthermore, in this embodiment, the annular throttle 30 reduces the pressure and temperature of the high-temperature, high-pressure medium contained in the bearing holder 10, so that the pressure of the medium meets the design requirements of the hydrostatic air bearing. The temperature of heating by the heating rod 40 is adjustable, which allows the liquid phase in the medium to be completely vaporized into gas, and prevents the liquid in the medium from entering the first gap 101.

[0023] In the electrically heated dehumidifying hydrostatic air bearing provided by the embodiment of the present invention, an annular throttle and multiple heating rods are installed, which reduce the temperature and pressure of the medium through the throttle effect, and the heating rods 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, and when heated by the heating rod 40, its poor thermal conductivity can effectively reduce the temperature and pressure.

[0027] As shown in FIG. 1, in an embodiment of the present invention, a plurality of heating rods 40 are arranged annularly along the circumferential direction of the annular aperture 30 to form heating layers, and the number of heating layers is multiple, with a pitch between two adjacent heating layers. Specifically, multiple heating layers are built into the annular throttle 30, with a pitch between two adjacent heating layers. This results in a structure in which throttle layers and heating layers are alternately stacked. Each throttle layer reduces the temperature and pressure of the medium. Each heating 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 enable the pressure of the medium to be reduced to meet the design requirements of the hydrostatic air bearing. The multiple heating layers ensure that the medium entering the first gap 101 is a pure gaseous medium, ensuring stable operation of the hydrostatic air bearing.

[0028] Furthermore, in the embodiment of the present invention, the number of heating rods 40 in each heating layer and the material and size of the heating rods 40 may be set based on the specific parameters of the hydrostatic air bearing.

[0029] In the electrically heated dehumidifying hydrostatic air bearing provided by the embodiment of the present invention, multiple heating layers are built into the annular restrictor, forming a structure in which multiple restrictor layers and multiple heating 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 remains 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 the medium passes through each heating layer, turning the medium into pure gas. This prevents liquid from entering the first gap of the hydrostatic air bearing and ensuring reliable operation of the hydrostatic air bearing.

[0030] As shown in FIG. 1, in an embodiment of the present invention, the electrically heated dehumidifying hydrostatic air bearing further includes a first variable resistor 50, which is electrically connected to the plurality of heating rods 40, and the first variable resistor 50 is used to adjust the power of the heating rods 40.

[0031] Specifically, multiple heating rods 40 are connected in parallel and then connected in series with a first variable resistor 50. By adjusting the resistance value of the first variable resistor 50, the heating power of each heating rod 40 can be adjusted, ensuring that the liquid phase in the medium is completely vaporized when the medium passes through the heating rod 40.

[0032] Furthermore, as shown in Fig. 2, when there are two heating layers, the ends of two heating rods 40 positioned opposite each other on the two heating layers are connected by leads 80, and then connected to the first variable resistor 50 to form a circuit. Moreover, the circuit is provided with a power supply 60. In this embodiment, even when there are two heating layers, all of the heating rods 40 on each heating layer are electrically connected to the first variable resistor 50, so that the heating power of the heating rods 40 on each heating layer is equal.

[0033] Furthermore, when there are multiple heating layers, the electrically heated dehumidifying hydrostatic air bearing further includes a second variable resistor and a third variable resistor. The second variable resistor is electrically connected to the heating layer adjacent to the first gap 101, and the third variable resistor is electrically connected to each of the remaining heating layers.

[0034] Specifically, take the embodiment shown in FIG. 1 as an example. In FIG. 1, the number of heating layers is two. Along the flow direction of the medium, the medium must pass through the second heating layer and then one more throttling layer, causing its temperature to drop again. Therefore, in this embodiment, two variable resistors are installed, one of which is electrically connected to the first heating layer to adjust the heating power of the first heating layer, and the other variable resistor is electrically connected to the second heating layer to adjust the heating power of the second heating layer. Furthermore, to ensure that the medium remains a pure gas medium even after its temperature has dropped when it passes through the last throttling layer, the heating power of the second heating layer may be greater than the heating power of the first heating layer.

[0035] 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 70 is formed in the second gap 102.

[0036] 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 has a second through hole through which the rotating shaft 20 is inserted, and the diameter of the second through hole is larger than the diameter of the rotating shaft 20 to form an exhaust passage.

[0037] Specifically, the pair of end caps 12 are respectively installed on both ends of the ring fixture 11, thereby forming a cavity inside the bearing holder 10, and the annular orifice 30 is located within this cavity, with a second gap 102 between the annular orifice 30 and the ring fixture 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 through hole is formed that passes through the bearing holder 10. The lead 80 passes through the end cap 12 and is then connected to an external power source 60.

[0038] The electrically heated dehumidifying hydrostatic air bearing provided by the embodiment of the present invention has a simple dehumidifying system structure, and the built-in heating rod fully utilizes the original structure of the bearing, so automatic dehumidification can be achieved by simply connecting an external power supply and variable resistor. Furthermore, the electrically heated dehumidifying hydrostatic air bearing provided by the embodiment of the present invention has an excellent dehumidifying effect, keeps the maximum temperature of the medium low, and divides the throttling and heating process of the medium into multiple stages, with the temperature being lowered by the annular throttling and then heated by the heating rod in each stage, thereby increasing the total heat-receiving area and achieving uniform heat absorption, and effectively removing the liquid phase in the medium. Furthermore, during this process, the medium must first be cooled and then heated multiple times, which avoids the temperature of the bearing structure being too high locally and affecting the service life of the bearing.

[0039] 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 equivalently substituted for some of the components therein. 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]

[0040] 10...bearing holder, 11...annular fitting, 12...end cap, 20...rotating shaft, 30...annular restriction, 40...heating rod, 50...first variable resistor, 60...power source, 70...intake pipe, 80...lead, 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 heating rods that are built into the annular throttle and are arranged annularly along the circumferential direction of the annular throttle, for heating and vaporizing the liquid phase in the medium whose temperature has been reduced; An electrically heated dehumidifying hydrostatic air bearing.

2. 2. The electrically heated dehumidifying hydrostatic air bearing according to claim 1, wherein said annular restrictor is made of a material having a porous structure.

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 medium; 2. The electrically heated dehumidifying hydrostatic air bearing according to claim 1.

4. 4. The electrically heated dehumidifying hydrostatic air bearing according to claim 1, wherein the annular restrictor is a non-metallic annular restrictor.

5. further comprising a first variable resistor; the first variable resistor is electrically connected to a plurality of the heating rods; the first variable resistor is for adjusting the power of the heating rod; 2. The electrically heated dehumidifying hydrostatic air bearing according to claim 1.

6. Both ends of the plurality of heating rods are connected by leads, and then connected to the first variable resistor.

6. An electrically heated dehumidifying hydrostatic air bearing according to claim 5.

7. 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 electrically heated dehumidifying hydrostatic air bearing according to claim 1.

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, 2. The electrically heated dehumidifying hydrostatic air bearing according to claim 1, wherein the diameter of the second through hole is larger than the diameter of the rotating shaft in order to form the exhaust passage.

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