Electrical heating type dehumidification 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 in particular to an electric heating type dehumidifying static pressure air bearing.

Background Art

[0002] A bearing is one of the core components of a power machine. For example, Patent Document 1 discloses a static pressure air bearing. The static pressure air bearing has a strong load-bearing capacity, and high-pressure gas inside the power system may be used as the bearing medium. 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.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide an electric heating type dehumidifying static pressure air bearing to solve the problem in the prior art that the bearing cannot operate reliably due to liquefaction into water droplets during the throttling and expansion process of the gas-liquid mixture.

Means for Solving the Problems

[0005] The present invention provides an electric heating 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, and an annular throttle located outside the rotating shaft, positioned within the cavity, and serving to lower the temperature by throttling a medium. The annular throttle has a first gap with the rotating shaft, and the first gap forms an exhaust passage penetrating through the bearing holder. The annular throttle is provided with a plurality of heating rods incorporated therein and annularly installed along the circumferential direction of the annular throttle for heating and vaporizing a liquid phase in the medium with a lowered temperature.

[0006] According to the electric heating type dehumidifying static pressure air bearing provided by the present invention, the annular throttle is made of a material having a porous structure.

[0007] According to the electric heating 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.

[0008] According to the electric heating type dehumidifying static pressure air bearing provided by the present invention, the annular throttle is a non-metallic annular throttle.

[0009] According to the electric heating type dehumidifying static pressure air bearing provided by the present invention, the plurality of heating rods are annularly provided along the circumferential direction of the annular throttle to form a heating layer. The number of the heating layers is multiple, and there is a pitch between two adjacent heating layers.

[0010] According to the electric heating type dehumidifying static pressure air bearing provided by the present invention, it further includes a first variable resistor electrically connected to the plurality of heating rods for adjusting the power of the heating rods.

[0011] According to the electric heating type dehumidifying static pressure air bearing provided by the present invention, it 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 the heating layers of the remaining respective layers.

[0012] According to the electric heating type dehumidifying static pressure air bearing provided by the present invention, both ends of the plurality of the heating rods are respectively connected by leads and then connected to the first variable resistor.

[0013] According to the electric heating type dehumidifying static pressure 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 constitutes an intake passage communicating with the intake pipe.

[0014] According to the electric heating 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 set to be larger than the diameter of the rotating shaft.

Advantages of the Invention

[0015] In the electric heating type dehumidifying static pressure air bearing provided by the present invention, due to the installation of the annular throttle and the plurality of heating rods, by the throttling effect, while reducing the temperature and pressure of the medium, the heating rods heat the liquid phase in the medium to vaporize it into gas, thereby avoiding the situation that the static pressure air bearing cannot operate stably due to liquid entering the first gap during the operation process of the static pressure air bearing, and improving the reliability of the operation of the static pressure air bearing.

Brief Description of the Drawings

[0016] To more clearly explain the technical solutions of the present invention or the prior art, the following briefly introduces the attached drawings necessary for the description of the embodiments or the prior art. Obviously, the attached drawings described below are only some embodiments of the present invention, and for those skilled in the art, it is possible to obtain other attached drawings based on these attached drawings without creative effort.

Figure 1

Figure 2

Embodiments for Carrying out the Invention

[0017] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the attached drawings of the present invention. Obviously, the described embodiments are only part of the 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 effort shall fall within the protection scope of the present invention.

[0018] For the constituent elements limited by the terms "first" and "second" in the description and claims of this application, one or more of such constituent elements may be explicitly or implicitly included. In the description of the present invention, unless otherwise explained, "a plurality" means two or more.

[0019] The following will describe the electric heating type dehumidifying static pressure air bearing in the present invention with reference to Fig. 1 and Fig. 2.

[0020] As shown in FIG. 1, in an embodiment of the present invention, an electric heating type dehumidifying static pressure air bearing includes a bearing holder 10, a rotating shaft 20, an annular throttle 30, and a plurality of heating rods 40. A cavity is provided 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 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 is for reducing the temperature by throttling the medium. The plurality of heating rods 40 are built into the annular throttle 30 and are annularly installed along the circumferential direction of the annular throttle 30. The heating rods 40 are for heating and vaporizing the liquid phase in the medium with a lowered temperature.

[0021] Specifically, in an embodiment of the present invention, the number of the intake pipes 70 may be plural. The plurality of intake pipes 70 are annularly installed along the circumferential surface of the bearing holder 10. The intake pipes 70 are for allowing the medium to enter the cavity of the bearing holder 10. In this embodiment, the medium 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 heating rods 40. Since the heating rods 40 are for heating the medium, 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, and the gas is discharged from the first gap 101 between the annular throttle 30 and the rotating shaft 20, thereby avoiding the situation that after the liquid enters the first gap 101 of the static pressure air bearing, the static pressure air bearing cannot operate normally and stably.

[0022] Furthermore, in this embodiment, the annular throttle 30 is for reducing the pressure and temperature of the high-temperature and high-pressure medium that enters the bearing holder 10, so that the pressure of the medium meets the design requirements of the static pressure air bearing. The temperature of the heating by the heating rod 40 is adjustable, so that the liquid phase in the medium can be completely vaporized into gas, and it is possible to avoid the liquid in the medium from entering into the first gap 101.

[0023] In the electric heating type dehumidifying static pressure air bearing provided by the embodiment of the present invention, due to the installation of the annular throttle and the plurality of heating rods, by the throttling effect, while reducing the temperature and pressure of the medium, the liquid phase in the medium is heated by the heating rod and vaporized into gas, so that in the operation process of the static pressure air bearing, it is possible to avoid the situation that the static pressure air bearing cannot operate stably due to the liquid entering the first gap, and the reliability of the operation of the static pressure air bearing is improved.

[0024] As shown in FIG. 1, in one 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. Since it has microvoids, when the medium passes through the microvoids, the microvoids exert a throttling effect on the medium, thereby reducing the temperature and pressure of the medium. 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] Optionally, in another embodiment of the present invention, a plurality of first through holes are provided on the wall surface of the annular throttle 30. Specifically, in this embodiment, the annular throttle 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 the embodiments of the present invention, the annular throttle 30 is preferably a non-metallic annular throttle. Since the non-metallic annular throttle has poor thermal conductivity, in the case of heating by the heating rod 40, due to its poor heat conduction ability, it is possible to effectively exert the functions of temperature drop and pressure drop.

[0027] As shown in FIG. 1, in the embodiments of the present invention, a plurality of heating rods 40 are annularly provided along the circumferential direction of the annular throttle 30 to form a heating layer. The number of heating layers is multiple, and there is a pitch between two adjacent heating layers. Specifically, inside the annular throttle 30, multiple heating layers are built in, and there is a pitch between two adjacent heating layers. In this way, a structure is formed in which the throttle layer and the heating layer are alternately laminated and installed. Each throttle layer is for reducing the temperature and pressure of the medium. Each heating layer is for heating the medium with a lowered temperature to vaporize the liquid phase in the medium into gas, and to ensure that after the medium passes through each heating layer, it becomes a pure gas medium. 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 heating 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.

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

[0029] In the electrothermal dehumidifying static pressure air bearing provided by the embodiment of the present invention, since a plurality of heating layers are built in the annular throttle, the annular throttle forms a structure in which a plurality of throttle layers and a plurality of heating layers are alternately arranged. Thereby, in the process of fluid flow, 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 prevented from being locally too high and affecting the service life of the static pressure air bearing. In addition, since the heating is performed multiple times, each time the medium passes through a heating layer, the liquid phase in the medium is vaporized into gas, and the medium becomes pure gas, so that the liquid is prevented from entering the first gap of the static pressure air bearing, and the reliability of the operation of the static pressure air bearing is ensured.

[0030] As shown in FIG. 1, in the embodiment of the present invention, the electrothermal dehumidifying static pressure air bearing further includes a first variable resistor 50, and the first variable resistor 50 is electrically connected to a plurality of heating rods 40 for adjusting the power of the heating rods 40.

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

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

[0033] Furthermore, when the number of heating layers is plural, the electric heating type dehumidifying and static pressure 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, taking 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, after the medium passes through the second heating layer, it must further pass through the first throttle layer, so its temperature becomes low again. Therefore, in this embodiment, two variable resistors are installed such that one of the variable resistors 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. And when the medium passes through the last throttle layer, even after the temperature becomes low, in order to ensure that the medium is still a pure gas medium, 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 throttle 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 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 larger than the diameter of the rotating shaft 20.

[0037] 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 constitutes 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 through hole penetrating the bearing holder 10 is formed. The lead 80 is connected to the external power supply 60 after passing through the end cap 12.

[0038] The electric heating type dehumidifying static pressure air bearing provided by the embodiment of the present invention has a simple dehumidification system structure. Since the built-in heating rod makes full use of the original structure of the bearing, only by connecting an external power supply and a variable resistor, automatic dehumidification can be realized. In addition, the electric heating type dehumidifying static pressure air bearing provided by 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 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 heating rod, so the total heat receiving area becomes larger and it can be heated evenly, and the liquid phase in the medium can be effectively removed. Moreover, throughout the process, by performing the steps of first lowering the temperature and then heating the medium multiple times, it is avoided that the temperature of the bearing structure is too high locally and affects the service life of the bearing.

[0039] 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 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 each embodiment of the present invention.

Description of Reference Numerals

[0040] 10... bearing holder, 11... annular member, 12... end cap, 20... rotating shaft, 30... annular throttle, 40... heating rod, 50... first variable resistor, 60... power supply, 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 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 heating rods are provided in 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.

1. An electrically heated dehumidifying hydrostatic air bearing comprising:

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 throttling 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. The heating rods are provided annularly along the circumferential direction of the annular throttle and are formed as a heating layer, The number of the heating layers is multiple, There is a pitch between two adjacent heating layers.

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

6. 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.

7. a second variable resistor electrically connected to the heating layer adjacent the first gap; a third variable resistor electrically connected to the heating layer of each of the remaining layers.

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

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

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

9. a second gap is formed between the annular throttle and an inner wall of the bearing holder; The second gap constitutes an intake passage communicating with the intake pipe.

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

10. 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, 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.

Images