KR20240106716A - Coupling structure for cryogenic superconducting rotating machine - Google Patents

Abstract

The coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention includes a rotating part that rotates in a cryogenic superconducting state and has a first refrigerant passage for the cryogenic refrigerant to flow therein, and the rotating part is rotatably supported. A stop part coupled to a rotating part and provided therein with a second refrigerant flow path connected to the first refrigerant flow path to enable supply and discharge of the refrigerant to the first refrigerant flow path, and a coupling part between the stop part and the rotating part. It is disposed in and includes a magnetic fluid seal that seals the coupling portion of the stationary portion and the rotating portion to maintain a vacuum state. Here, a cylindrical stop connection pipe may be formed in the coupling part of the stop part, and the coupling part of the rotating part may have a diameter that can be inserted into the stop connection pipe so as to be axially coupled to the stop connection pipe. A cylindrical rotating part connecting pipe may be formed.

Description

Coupling structure of cryogenic superconducting rotator {COUPLING STRUCTURE FOR CRYOGENIC SUPERCONDUCTING ROTATING MACHINE}

The present invention relates to a coupling structure of a cryogenic superconducting rotator, and more specifically, to a coupling structure of a cryogenic superconducting rotator that can easily connect or separate the rotating part and the stationary part by improving the coupling structure of the rotating part and the stationary part.

In general, high temperature superconductor (HTS) wires have the characteristic of having direct current resistance of '0' below the critical temperature, and thus can increase current density compared to normal conducting metal wires. Therefore, if an electromagnet wound using a high-temperature superconducting wire is applied to a rotating machine (eg, an electric motor or generator, etc.), it is possible to reduce the weight and miniaturization of the rotating machine.

However, it is essential that electromagnets using high-temperature superconducting wires be cooled below the operating temperature, and typically have an operating temperature of 30K or lower. To cool a superconducting rotor to a cryogenic temperature of 77K or less, a separate cryogenic refrigerator is installed or cooled by circulating a cryogenic refrigerant such as hydrogen, nitrogen, neon, or helium. At this time, the cryogenic freezer contains heavy materials such as compressors and high-pressure piping, so it is not suitable for vehicles or aircraft used as rotating machines.

Meanwhile, the cooling method using a cryogenic refrigerant has a saturation temperature of 77K or less at atmospheric pressure, so it is suitable for cooling the rotor below the operating temperature. However, when transferring cryogenic refrigerant to the rotor of a rotating machine for cooling, a coupling is needed in the conveying pipe to continuously perform the cooling function even when the rotating machine is driven to rotate. In particular, a fixed-rotation coupling between the rotating part and the stationary part of the rotator is essential.

The fixed-rotating coupling as described above has the problem of very high manufacturing difficulty because of the risk of refrigerant leakage and the need to prevent wear during mechanical coupling.

Korean Patent No. 10-2195462 (registered on December 21, 2020)

An embodiment of the present invention provides a coupling structure for a cryogenic superconducting rotator that can easily connect or separate the rotating part and the stationary part by improving the coupling structure of the rotating part and the stationary part.

In addition, the embodiment of the present invention allows for easy and stable attachment and detachment of the rotating part and the stationary part by connecting and separating the rotating part connection pipe and the stationary part connection pipe manufactured with a triple concentric piping structure, and the connection pipe for the rotating part and the stationary part connection pipe We provide a coupling structure for a cryogenic superconducting rotator that can increase the durability of the connection between the rotating part connecting pipe and the stationary connecting pipe by placing a non-contact seal at the connecting part.

According to one embodiment of the present invention, a rotating part that rotates in a cryogenic superconducting state and has a first refrigerant passage for flowing cryogenic refrigerant provided therein, is coupled to the rotating part to rotatably support the rotating part, and 1 A second refrigerant flow path connected to the first refrigerant flow path is disposed on a stop part provided therein to enable supply and discharge of the refrigerant to the refrigerant flow path, and a coupling part of the stop part and the rotating part, and the stop part and the Provided is a coupling structure for a cryogenic superconducting rotator that includes a magnetic fluid seal that seals the coupling part of the rotating part and maintains a vacuum state.

Here, a cylindrical stop connection pipe may be formed in the coupling part of the stop part, and the coupling part of the rotating part may have a diameter that can be inserted into the stop connection pipe so as to be axially coupled to the stop connection pipe. A cylindrical rotating part connecting pipe may be formed.

Preferably, the rotating unit connecting pipe may be provided as a multi-concentric pipe structure having different diameters while sharing the same first concentric axis. The stop connection pipe may be provided as a multi-concentric pipe structure having different diameters corresponding to the rotating section connection pipe while sharing the same second concentric axis as the first concentric axis.

The rotating part connecting pipe and the stopping part connecting pipe may be rotatably connected while being inserted into each other as they move in a connection direction that approaches each other along the first concentric axis and the second concentric axis, and the first concentric axis and the They may be separated as they move in a separation direction away from each other along the second concentric axis.

Preferably, the rotating part connection pipe is a first refrigerant supply pipe that forms a first refrigerant supply passage that receives the refrigerant from the stop connection pipe and supplies it to the inside of the rotating part, and has a diameter larger than the first refrigerant supply pipe. a first refrigerant discharge pipe disposed within the first refrigerant supply pipe and forming a second refrigerant discharge passage between the first refrigerant supply pipe and the second refrigerant discharge passage for discharging the refrigerant from the rotating part to the stop connection pipe; and It may include a first vacuum tube provided to form a vacuum space surrounding the outside of the second refrigerant discharge pipe.

Preferably, the stop connection pipe includes a second refrigerant supply pipe rotatably connected to the first refrigerant supply pipe and forming a second refrigerant supply passage for supplying the refrigerant to the first refrigerant supply pipe. It is formed to have a larger diameter, the second refrigerant supply pipe is disposed inside, is rotatably connected to the first refrigerant discharge pipe, and the refrigerant flows from the first refrigerant discharge pipe between the second refrigerant supply pipe and the stopper to the outside of the stopper. It may include a second refrigerant discharge pipe forming a second refrigerant discharge path for discharging, and a second vacuum pipe rotatably connected to the first vacuum pipe and provided to form a vacuum space surrounding an outside of the second refrigerant discharge pipe. You can.

Preferably, inside the rotating part, a refrigerant circulation passage is formed that guides the refrigerant supplied to the first refrigerant supply pipe to the rotor of the rotating part and then guides the refrigerant that cooled the rotor to the first refrigerant discharge pipe. A refrigerant circulation pipe may be provided. A plurality of refrigerant circulation pipes as described above may be formed radially around the first refrigerant discharge pipe depending on the arrangement position of the rotor.

Preferably, a cylindrical vacuum tube coupling portion for coupling the second vacuum tube by insertion may be formed at an end of the first vacuum tube. Here, the ferrofluid seal may be disposed at a connection portion between the vacuum tube coupling portion and the second vacuum tube to seal a gap between the vacuum tube coupling portion and the second vacuum tube. Additionally, the connection passage may be formed along a gap between the vacuum tube coupling portion and the second vacuum tube.

Preferably, one end of the vacuum tube coupling unit may be connected to the second refrigerant discharge pipe to rotate the vacuum tube coupling unit together with the second refrigerant discharge pipe, and the other end of the vacuum tube coupling unit may be connected to the magnetic fluid seal. At this time, a coupling pipe may be disposed outside the vacuum tube coupling portion in a shape surrounding the vacuum tube coupling portion to protect the vacuum tube coupling portion.

Preferably, the coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention may further include a non-contact seal disposed at the connection portion of the rotating part connection pipe and the stationary part connection pipe and reducing leakage of the refrigerant. there is.

The connection portion of the rotating portion connection pipe and the stop portion connection pipe may include a connection portion of the first refrigerant supply pipe and the second refrigerant supply pipe, and a connection portion of the first refrigerant discharge pipe and the second refrigerant discharge pipe.

Preferably, the non-contact seal is provided with at least one of a first non-contact seal that increases the flow path of the refrigerant while impeding the flow of the refrigerant, or a second non-contact seal that reverses the flow of the refrigerant according to the principle of the Archimedes spiral pump. You can.

The first non-contact seal is a first seal mounting part mounted in a cylindrical shape on the surface of any one of the connecting parts of the rotating part connection pipe and the stationary part connecting pipe, and the other of the connecting parts of the rotating part connecting pipe and the stopping part connecting pipe. It may include a ring-shaped protrusion protruding in a ring-shaped structure from the inner peripheral surface or outer peripheral surface of the first seal mounting portion so as to not contact one surface.

The second non-contact seal is a second seal mounting part mounted in a cylindrical shape on the surface of one of the connecting parts of the rotating part connection pipe and the stationary part connecting pipe, and the other of the connecting parts of the rotating part connecting pipe and the stopping part connecting pipe. It may include a spiral protrusion protruding in a spiral structure from the inner peripheral surface or outer peripheral surface of the second seal mounting portion so as to be non-contact with one surface.

Preferably, the non-contact seal is the first non-contact seal or a single spiral structure to increase the flow path of the refrigerant when the flow rate of the refrigerant flowing into the connection portion of the rotating part connection pipe and the stationary part connection pipe is greater than the set flow rate. The second non-contact seal may be installed, and if the flow rate of the refrigerant flowing into the connection part of the rotating part connection pipe and the stationary part connection pipe is less than the set flow rate, the second non-contact seal of the multi-spiral structure is used to increase the counterflow efficiency of the refrigerant. Non-contact seals can be installed.

The coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention improves the coupling structure of the rotating part and the stationary part, so that the rotating part and the stationary part can be easily connected or separated, thereby making maintenance of the rotating part and the stationary part very easy. It can be done.

In addition, the coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention allows smooth supply and discharge of refrigerant through the rotating part connection pipe and the stop connection pipe manufactured in a triple concentric piping structure, and the corresponding rotating part connection. By simply connecting and disconnecting the pipe and the stationary part connection pipe, the rotating part and the stationary part can be easily and reliably attached and detached.

In addition, the coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention improves durability of the connection portion between the rotating portion connecting pipe and the stationary portion connecting pipe by placing a non-contact seal at the connection portion between the rotating portion connecting pipe and the stationary portion connecting pipe. It is possible to reduce the risk of refrigerant leakage at the connection between the rotating part connecting pipe and the stationary connecting pipe.

In addition, the coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention is a structure in which the non-contact seal disposed at the connection portion of the rotating part connection pipe and the stationary part connection pipe obstructs the flow of the refrigerant and complicates the flow path, so the refrigerant Leakage can be reduced through a gradual pressure drop through the throttling action as it passes through the non-contact seal.

In addition, the coupling structure of the cryogenic superconducting rotator according to an embodiment of the present invention is a structure that uses the rotational force of the rotating part connection pipe to flow the refrigerant in the reverse direction according to the principle of the Archimedes spiral water pump, so that the rotating part is connected when the cryogenic superconducting rotator operates. The non-contact seal forces the refrigerant to flow in the reverse direction due to the rotational force of the pipe, thereby significantly reducing the amount of refrigerant leakage through the connection between the rotating part connecting pipe and the stationary connecting pipe.

Figure 1 is a diagram schematically showing the coupling structure of a cryogenic superconducting rotator according to an embodiment of the present invention.
FIG. 2 is a diagram showing a separated state of the coupling structure shown in FIG. 1.
Figure 3 is a perspective view showing the coupling structure of a cryogenic superconducting rotator according to another embodiment of the present invention.
FIG. 4 is a diagram showing the internal structure of the cryogenic superconducting rotator shown in FIG. 3.
FIG. 5 is a cross-sectional view showing the cryogenic superconducting rotator shown in FIG. 3.
FIG. 6 is an enlarged view of the main part of the cryogenic superconducting rotator shown in FIG. 5.
FIG. 7 is a view showing the first non-contact seal of the non-contact seal shown in FIG. 5 at various angles.
FIGS. 8 and 9 are views showing the second non-contact seal of the non-contact seal shown in FIG. 5 at various angles, respectively.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited or limited by the examples. The same reference numerals in each drawing indicate the same members.

Figure 1 is a diagram schematically showing the coupling structure 200 of the cryogenic superconducting rotator 20 according to an embodiment of the present invention, and Figure 2 shows the separated state of the coupling structure 200 shown in Figure 1. This is the drawing shown.

Referring to FIG. 1, the coupling structure 200 of the cryogenic superconducting rotator 20 according to an embodiment of the present invention includes a rotating part 110, a stopping part 120, a magnetic fluid seal 130, and a non-contact seal 140. ) may include.

The cryogenic superconducting rotator 20 according to this embodiment is a device that rotates at extremely low temperatures, such as a superconducting motor, superconducting generator, and superconducting blower. The cryogenic superconducting rotator 20 as described above can be manufactured in a structure in which the rotating part 110 and the stopping part 120 are coupled to each other so as to be detachable, and accordingly, the coupling part of the rotating part 110 and the stopping part 120 The rotating unit 110 may be rotated based on (C).

Additionally, a ferro-fluid seal 130 may be disposed on the coupling portion C of the rotating portion 110 and the stopping portion 120 to maintain a vacuum state and block external heat intrusion. At this time, the magnetic fluid seal 130 has a structure that freezes and loses the performance of the seal when it comes into contact with the liquid cryogenic refrigerant (R), so the magnetic fluid seal 130 minimizes heat load by forming a temperature gradient. It can be installed in the coupling part (C) with a bayonet connection structure.

In addition, the refrigerant (R) is used to cool the cryogenic superconducting rotator 20 to a cryogenic state. After being supplied to the rotating part 110 through the stop part 120, the refrigerant (R) can be used to bring the rotating part 110 into a cryogenic state. The heat generated during the rotational operation of (110) can be absorbed and then discharged through the stopper (120). For example, the refrigerant (R) may be liquid nitrogen, neon, liquid hydrogen (LH ₂ ), hydrogen gas (GH ₂ ), helium gas, etc., but hereinafter, liquid hydrogen is used as the refrigerant (R). It is explained as follows.

For reference, the refrigerant (R) supplied to the cryogenic superconducting rotator (20) can be supplied from the refrigerant (R) stored in a refrigerant tank (not shown), and the refrigerant (R+H) discharged from the cryogenic superconducting rotor (20). Since it contains hydrogen gas (H) that undergoes a phase change while absorbing heat, it can be supplied to a fuel cell to use the hydrogen gas (H) or supplied to the stator of the rotating part 110, which will be described later.

Referring to Figures 1 and 2, the rotating part 110 of this embodiment can be rotated in a superconducting state at a very low temperature. Inside the rotating unit 110, first refrigerant passages 110a, 110b, and 110c may be provided through which the cryogenic refrigerant (R) flows. The first refrigerant passages 110a, 110b, and 110c as described above may be connected in communication with the second refrigerant passages 120a and 120b of the stopper 120, which will be described later.

For example, the rotating unit 110 may include a rotating unit connecting pipe 111, a stator (not shown), a rotor 115, a vacuum chamber 116, a rotating shaft 117, and a bearing member 118.

The rotating unit connection pipe 111 may be formed in a cylindrical shape in the coupling unit C of the rotating unit 110. The rotating part connecting pipe 111 may be connected to the stopping part connecting pipe 121, which will be described later, by a coupling method in which it is rotatably inserted. To this end, the diameter of the rotating part connecting pipe 111 may be formed to have a different diameter from that of the stationary part connecting pipe 121. In this embodiment, the rotating part connecting pipe 111 and the stationary part connecting pipe 121 rotate with each other. It is explained as having a triple concentric piping structure that can be inserted and connected as much as possible.

That is, the rotating part connecting pipe 111 and the stopping part connecting pipe 121 are each formed of three pipes having different diameters, and the three pipes are overlapped so that the rotation axes of the three pipes are located on the same axis. It can be prepared with For example, the rotating unit connection pipe 111 may be provided as a multi-concentric pipe structure having different diameters while sharing the same first concentric axis. Additionally, the stationary part connecting pipe 121 may be provided as a multi-concentric piping structure having different diameters corresponding to the rotating part connecting pipe 111 while sharing the same second concentric axis as the first concentric axis.

At this time, the rotating part connecting pipe 111 and the stopping part connecting pipe 121 may be inserted into each other and rotatably connected as they move in a connection direction that approaches each other along the first concentric axis and the second concentric axis. On the other hand, the rotating part connecting pipe 111 and the stopping part connecting pipe 121 may be separated as they move in a separation direction away from each other along the first concentric axis and the second concentric axis.

Meanwhile, in this embodiment, the connection between the stationary part connection pipe 121 and the rotating part connection pipe 111 is prevented so that the refrigerant (R) does not easily leak through the connection part between the rotating part connecting pipe 111 and the stationary part connecting pipe 121. It is desirable to make the gap formed in as small as possible. To this end, the diameters of the three pipes of the rotating part connecting pipe 111 may be formed to be very slightly different from the diameters of the three pipes of the stationary part connecting pipe 121.

As shown in Figures 1 and 2, the rotating part connection pipe 111 may be formed as a triple concentric pipe structure. For example, the rotating unit connection pipe 111 may include a first refrigerant supply pipe 112, a first refrigerant discharge pipe 113, and a first vacuum pipe 114. At this time, the first refrigerant supply pipe 112, the first refrigerant discharge pipe 113, and the first vacuum pipe 114 are arranged on the same axis with respect to the first concentric axis, and the first refrigerant supply pipe 112 is connected to the first refrigerant discharge pipe. It may be rotatably disposed inside the 113 , and the first refrigerant discharge pipe 113 may be rotatably disposed inside the first vacuum tube 114 .

Here, the first refrigerant supply pipe 112 may be disposed inside the first refrigerant discharge pipe 113 and the first vacuum pipe 114, and when the rotating part 110 and the stopping part 120 are connected, the stopping part connecting pipe is used. It may be inserted in communication with the inside of the second refrigerant supply pipe 122 of (121), which will be described later. That is, the inlet portion of the first refrigerant supply pipe 112 may be rotatably inserted and connected to the outlet portion of the second refrigerant supply pipe 122, and the outlet portion of the first refrigerant supply pipe 112 may be formed inside the vacuum chamber 116. It may be connected in communication with the internal chamber 119. A first refrigerant supply passage 110a may be formed inside the first refrigerant supply pipe 112 to receive the cryogenic refrigerant (R) from the second refrigerant supply pipe 122 and guide it to the internal chamber 119.

In addition, the first refrigerant discharge pipe 113 may be disposed inside the first vacuum tube 114, and when the rotating part 110 and the stopping part 120 are connected, the second refrigerant discharge pipe 121, which will be described later, of the stopping part connecting pipe 121. It may be inserted in communication with the inside of the refrigerant discharge pipe 123. That is, the inlet portion of the first refrigerant discharge pipe 113 may be disposed on the rotor 115 side of the rotating unit 110, and the outlet portion of the first refrigerant discharge pipe 113 may rotate at the inlet portion of the second refrigerant discharge pipe 123. Possibly can be inserted and connected. Between the first refrigerant discharge pipe 113 and the first refrigerant supply pipe 112, the refrigerant (R+H) that cools the rotor 115 is delivered and the first refrigerant discharged to guide it to the inlet of the second refrigerant discharge pipe 123. A flow path 110b may be formed.

Inside the rotating unit 110, the refrigerant (R) supplied to the first refrigerant supply pipe 112 is guided to the rotor 115, and then the refrigerant (R) that cools the rotor 115 is transferred to the first refrigerant discharge pipe 113. A refrigerant circulation pipe 172 may be provided that forms a refrigerant circulation passage 110c leading to. A plurality of refrigerant circulation pipes 172 as described above may be formed in a radial arrangement centered on the first refrigerant discharge pipe 113 depending on the arrangement position of the rotor 115. For example, in this embodiment, a plurality of rotors 115 may be continuously disposed on the inner surface of the vacuum chamber 116 along the rotation direction of the rotating part 110, and accordingly, a plurality of refrigerant circulation pipes 172 may also be formed. It may be arranged in a radial shape spaced at a certain angle around the first refrigerant discharge pipe 113 so that it can be arranged in each of the plurality of rotors 115.

In addition, the first vacuum tube 114 may be arranged to surround the outside of the first refrigerant discharge pipe 113, and when the rotating part 110 and the stopping part 120 are connected, the stopping part connecting pipe 121, as described later, The second vacuum tube 124 may be inserted in communication therewith. The first vacuum tube 114 as described above may be formed as a double pipe structure that forms a vacuum space inside, and may be provided in a structure that blocks the first refrigerant discharge pipe 113 from the outside. Therefore, the first vacuum tube 114 blocks the first refrigerant discharge pipe 113 and the first refrigerant supply pipe 112 from external air, thereby preventing external heat intrusion into the first refrigerant discharge pipe 113 and the first refrigerant supply pipe 112. It can be prevented smoothly.

At the end of the first vacuum tube as described above, a cylindrical vacuum tube coupling portion 114a may be provided for coupling the second vacuum tube 124 by insertion. One end of the vacuum tube coupling portion 114a is connected to the second refrigerant discharge pipe 123 and can be rotated together with the second refrigerant discharge pipe 123, and the other end of the vacuum tube coupling portion 114a is connected to the second vacuum tube 124. It is arranged to surround the outer surface and may be connected to the magnetic fluid seal 130. For example, the vacuum tube coupling portion 114a of this embodiment may be formed in a cylindrical shape with an open surface on the side facing the second vacuum tube 124.

The stator (not shown) is provided at a position spaced outward from the outer surface of the vacuum chamber 116, and may be arranged in a structure surrounding the outer surface of the vacuum chamber 116 along the rotation direction of the rotating part 110. . The stator as described above may be fixed to a rotating unit housing (not shown) disposed on the outside of the rotating unit 110. For reference, a stator, a rotor 115, a vacuum chamber 116, etc. may be accommodated inside the rotating housing.

The rotor 115 may be disposed to face the stator with the vacuum chamber 116 interposed therebetween. That is, the rotor 115 is disposed at a position spaced inward from the inner surface of the vacuum chamber 116, and may be disposed along the inner surface of the vacuum chamber 116 along the rotation direction of the rotating part 110.

The vacuum chamber 116 is a hollow cylindrical chamber, and may be formed to maintain a vacuum state between the internal chamber 119 connected to the first refrigerant supply pipe 112 of the rotating unit connection pipe 111. This vacuum chamber 116 may be formed to surround the first refrigerant supply pipe 112, the first refrigerant discharge pipe 113, and the internal chamber 119 of the rotating unit connection pipe 111. Accordingly, the vacuum chamber 116 can prevent leakage of the refrigerant (R) and also prevent external heat intrusion into the refrigerant (R).

A rotor 115 and a rotating shaft 117 may be disposed in the vacuum space of the vacuum chamber 116 as described above. For reference, the internal chamber 119 is a chamber surrounded by the vacuum chamber 116, and serves as a reservoir to receive and store the refrigerant (R) through the first refrigerant supply pipe 112 of the rotating unit connection pipe 111. You can. At this time, the rotor 115 is preferably mounted on the outer surface of the internal chamber 119 cooled by cryogenic refrigerant (R).

One end of the rotation shaft 117 may be simultaneously connected to the vacuum chamber 116 and the inner chamber 119 so as to rotate together with the rotor 115, the vacuum chamber 116, and the inner chamber 119. The other end of the rotation shaft 117 may extend long along the rotation center of the rotation unit 110 and be exposed to the outside of the rotation unit 110.

The bearing member 118 may be provided as a current slip ring disposed on the other end of the rotating shaft 117.

Referring to Figures 1 and 2, the stopper 120 of this embodiment has a triple concentric piping structure in the rotary part 110 to enable supply and discharge of the refrigerant (R) while rotatably supporting the rotary part 110. Can be connected by coupling. Second refrigerant passages 120a and 120b connected to the first refrigerant passages 110a, 110b and 110c may be provided inside the stopper 120. The second refrigerant passages 120a and 120b may be capable of supplying and discharging the refrigerant R to the first refrigerant passages 110a, 110b, and 110c.

For example, the stopper 120 may include a refrigerant tank (not shown) and a stopper connection pipe 121.

The refrigerant tank stores extremely low temperature refrigerant (R) supplied to the stop connection pipe 121, and when necessary, can supply the refrigerant (R) to the inlet of the second refrigerant supply pipe 122 of the stop connection pipe 121. You can.

The stop connection pipe 121 may be formed in a cylindrical shape at the coupling part C of the stop 120. The stationary part connecting pipe 121 may be connected to the rotating part connecting pipe 111 by a coupling method in which it is rotatably inserted. The stop connection pipe 121 as described above may serve as a rotation axis that rotatably supports the rotation part 110 together with the rotation axis 117.

The stop connection pipe 121 as described above may be formed as a triple concentric pipe structure corresponding to the rotating section connection pipe 111. For example, the stop connection pipe 121 may include a second refrigerant supply pipe 122, a second refrigerant discharge pipe 123, and a second vacuum pipe 124. At this time, the second refrigerant supply pipe 122, the second refrigerant discharge pipe 123, and the second vacuum pipe 124 are arranged on the same axis with respect to the second concentric axis that is the same as the first concentric axis, and the second refrigerant supply pipe 122 ) may be disposed inside the second refrigerant discharge pipe 123, and the second refrigerant discharge pipe 123 may be disposed inside the second vacuum pipe 124.

Here, the second refrigerant supply pipe 122 may be disposed inside the second refrigerant discharge pipe 123 and the second vacuum pipe 124, and when the rotating part 110 and the stopping part 120 are connected, the rotating part connection pipe ( The first refrigerant supply pipe 112 of 111) may be inserted to communicate with the inside. The inlet part of the second refrigerant supply pipe 122 may be connected to a refrigerant tank, and the outlet part of the second refrigerant supply pipe 122 communicates with the first refrigerant supply pipe 112 of the rotating part connection pipe 111 connected to the internal chamber 119. It can be very connected. A second refrigerant supply passage 120a may be formed inside the second refrigerant supply pipe 122 to guide the cryogenic refrigerant (R) to the first refrigerant supply pipe 112 of the rotating part connection pipe 111.

In addition, the second refrigerant discharge pipe 123 may be disposed inside the second vacuum tube 124, and the first refrigerant discharge pipe of the rotating unit connection pipe 111 when the rotating unit 110 and the stationary unit 120 are connected ( 113) can be inserted to communicate with the inside. That is, the inlet portion of the second refrigerant discharge pipe 123 may be rotatably connected to the outlet portion of the first refrigerant discharge pipe 113, and the outlet portion of the second refrigerant discharge pipe 123 may be connected to the stator outside the stopper 120. Alternatively, it can be connected to a fuel cell. Between the second refrigerant discharge pipe 123 and the second refrigerant supply pipe 122, the refrigerant (R+H) is delivered from the first refrigerant discharge pipe 113 of the rotating part connection pipe 111 and discharged to the outside of the stopper 120. A second refrigerant discharge passage 120b may be formed.

In addition, the second vacuum tube 124 may be arranged to surround the outside of the second refrigerant discharge pipe 123, and when the rotating part 110 and the stopping part 120 are connected, the first vacuum tube of the rotating part connecting pipe 111 It can be rotatably inserted into the vacuum tube coupling portion 114a formed at the end of 114. The second vacuum tube 124 as described above may be formed as a double pipe structure that forms a vacuum space inside, and may be provided in a structure that blocks the second refrigerant discharge pipe 123 from the outside. Therefore, the second vacuum tube 124 blocks the second refrigerant discharge pipe 123 and the second refrigerant supply pipe 122 from external air, thereby preventing external heat intrusion into the second refrigerant discharge pipe 123 and the second refrigerant supply pipe 122. It can be prevented smoothly.

Referring to FIG. 1, the magnetic fluid seal 130 of this embodiment is a seal member that maintains the vacuum state of the cryogenic superconducting rotator 20 by sealing the coupling part C of the stationary part 120 and the rotating part 110. am. For example, the ferrofluid seal 130 is disposed on the coupling part C of the stop part 120 and the rotating part 110, and the refrigerant leaking between the connection part of the first vacuum tube 114 and the second vacuum tube 124 ( It can play a role in preventing R).

Here, the magnetic fluid seal 130 may be installed in an area where the stationary part connection pipe 121 and the rotating part connection pipe 111 overlap each other. That is, the magnetic fluid seal 130 is connected to the end of the vacuum tube coupling portion 114a and the outside of the second vacuum tube 124 to seal the gap between the other end of the vacuum tube coupling portion 114a and the outer peripheral surface of the second vacuum tube 124. Can be installed on the side.

Since the magnetic fluid seal 130 as described above is connected to the outer peripheral surface of the second vacuum tube 124 and the end of the vacuum tube coupling portion 114a, the refrigerant ( R) can be prevented from leaking, and in addition, the vacuum tube coupling portion 114a can be supported so that it can rotate together with the rotating portion 110.

And, between the second vacuum tube 124 of the stationary part connection pipe 121 and the vacuum tube coupling part 114a of the first vacuum tube 114 of the rotating part connection pipe 111, there is a connection passage connected to the magnetic fluid seal 130. (142) can be formed. Therefore, the magnetic fluid seal 130 can block the refrigerant (R) leaking between the coupling part (C) of the rotating part 110 and the stopping part 120.

The connection passage 142 as described above is formed along the gap between the other end of the vacuum tube coupling portion 114a and the outer surface of the second vacuum tube 124, and includes the magnetic fluid seal 130 and the first and second refrigerant passages ( It may be provided in a structure that connects 110a, 110b, 110c, 120a, and 120b). At this time, the inside of the connection passage 142 may be filled with gaseous refrigerant (H), and a bayonet ( It can be connected to the magnetic fluid seal 130 through a bayonet connection structure.

Referring to Figures 1 and 2, the non-contact seal 140 of this embodiment may be disposed at the connection portion of the rotating part connection pipe 111 and the stationary part connection pipe 121. In other words, the non-contact seal 140 can minimize the leakage of the refrigerant (R) through the connection portion of the rotating part connection pipe 111 and the stationary part connection pipe 121.

Here, the connection part of the rotating part connection pipe 111 and the stop part connection pipe 121 is the connection part of the first refrigerant supply pipe 112 and the second refrigerant supply pipe 122, and the first refrigerant discharge pipe 113 and the second refrigerant discharge pipe It may include a connection part of (123). Therefore, the non-contact seal 140 may be disposed at any one of the connection portions of the first refrigerant supply pipe 112 and the second refrigerant supply pipe 122, and the first refrigerant discharge pipe 113 and the second refrigerant discharge pipe 123 ) can be placed in any one of the connections.

Hereinafter, in this embodiment, it will be described that the non-contact seal 140 is disposed at the connection portion of the second refrigerant supply pipe 122 and the connection portion of the second refrigerant discharge pipe 123, respectively. That is, the non-contact seal 140 is disposed on the inner peripheral surface of the connection part of the second refrigerant supply pipe 122 into which the first refrigerant supply pipe 112 is inserted, thereby forming a gap between the connection part of the first refrigerant supply pipe 112 and the second refrigerant supply pipe 122. Leaking refrigerant (R) can be prevented. In addition, the non-contact seal 140 is disposed on the inner peripheral surface of the connection part of the second refrigerant discharge pipe 123 into which the first refrigerant discharge pipe 113 is inserted, so that it is inserted between the connection part of the first refrigerant discharge pipe 113 and the second refrigerant discharge pipe 123. Leaking refrigerant (R) can be prevented.

Meanwhile, the non-contact seal 140 may be formed to obstruct the flow of the refrigerant (R) while complicating the flow path, or to cause the refrigerant (R) to flow backwards in a direction opposite to the flow direction. Hereinafter, in this embodiment, the non-contact seal 140 may be provided as a labyrinth seal arranged to surround the connection portion of the second refrigerant supply pipe 122 and the connection portion of the second refrigerant discharge pipe 123.

The non-contact seal 140 arranged as described above can be maintained in a stationary state together with the second refrigerant supply pipe 122 and the second refrigerant discharge pipe 123 when the rotating unit connection pipe 111 rotates.

FIG. 3 is a perspective view showing the coupling structure 200 of the cryogenic superconducting rotator 20 according to another embodiment of the present invention, and FIG. 4 is a diagram showing the internal structure of the cryogenic superconducting rotator 20 shown in FIG. 3. , and FIG. 5 is a cross-sectional view showing the cryogenic superconducting rotator 20 shown in FIG. 3. FIG. 6 is an enlarged view of the main part of the cryogenic superconducting rotator 20 shown in FIG. 5, and FIG. 7 is a view showing the first non-contact seal 150 of the non-contact seal 140 shown in FIG. 5 at various angles. , FIGS. 8 and 9 are views showing the second non-contact seal 160 of the non-contact seal 140 shown in FIG. 5 at various angles.

That is, in FIGS. 3 to 9, identical and similar reference numerals to those shown in FIGS. 1 and 2 indicate the same configuration, and detailed description thereof will be omitted. Hereinafter, the description will focus on differences from the coupling structure 200 of the cryogenic superconducting rotator 20 shown in FIGS. 1 and 2.

Referring to FIGS. 3 to 6, the coupling structure 200 of the cryogenic superconducting rotator 20 according to another embodiment of the present invention is the coupling structure of the cryogenic superconducting rotator 10 shown in FIGS. 1 and 2 ( 100), there is a difference in the coupling connection method of the rotating part connection pipe 111 and the stationary part connection pipe 121, and there is a difference in the type and arrangement structure of the non-contact seal 140.

As shown in FIGS. 5 and 6, the coupling portion C of the cryogenic superconducting rotator 20 of this embodiment is axially larger than the coupling portion C of the cryogenic superconducting rotator 10 shown in FIGS. 1 and 2. It can be formed shorter in direction. Therefore, in this embodiment, since the overall length of the cryogenic superconducting rotator 20 can be reduced, the weight and volume of the cryogenic superconducting rotator 20 can also be reduced, thereby increasing the efficiency of output to weight.

To this end, in this embodiment, the length of the first vacuum tube 114 may be shortened in the axial direction to form an integrated structure with the vacuum tube coupling portion 114a. That is, the vacuum tube coupling portion 114a is configured to connect to the second vacuum tube 124, but in this embodiment, it also performs the function of the first vacuum tube 114 surrounding the outer surface of the first refrigerant discharge pipe 113. I'm doing it. Accordingly, the length of the coupling portion C of the cryogenic superconducting rotator 20 of this embodiment can be significantly reduced in the axial direction as the size of the first vacuum tube 114 is reduced.

As shown in FIGS. 2 to 6 , a coupling pipe 170 that protects the vacuum tube coupling portion 114a may be disposed outside the vacuum tube coupling portion 114a in this embodiment. Accordingly, the connecting passage 142 formed between the vacuum tube coupling portion 114a and the second vacuum tube 124 is not directly exposed to the outside by the coupling pipe 170.

Here, the coupling pipe 170 may be manufactured in a shape that surrounds the outer surface of the vacuum tube coupling portion 114a. One end of the coupling pipe 170 may be fixed to the vacuum chamber 116 of the rotating unit 110, and the other end of the coupling pipe 170 may be connected to the magnetic fluid seal 130. Accordingly, the coupling pipe 170 can protect the vacuum tube coupling part 114a that rotates together with the rotor 115 of the rotating part 110, and can support the magnetic fluid seal 130 more stably.

As shown in FIGS. 5 to 9 , the non-contact seal 140 of this embodiment may be provided as at least one of the first non-contact seal 150 and the second non-contact seal 160.

Here, the first non-contact seal 150 may be provided to complicatedly increase the flow path of the refrigerant (R) while impeding the flow of the refrigerant (R). As shown in FIG. 7, the first non-contact seal 150 is a first seal mounting portion 152 mounted in a cylindrical shape on one of the surfaces of the connecting portion of the rotating portion connecting pipe 111 and the stationary portion connecting pipe 121. ), and a ring-shaped protrusion 154 protruding in a ring-shaped structure from the inner or outer peripheral surface of the first seal mounting portion 152 so as to not contact the other surface of the connecting portion of the rotating portion connecting pipe 111 and the stationary portion connecting pipe 121. It can be included.

A plurality of ring-shaped protrusions 154 may be provided to be spaced apart along the longitudinal direction of the first seal mounting portion 152. At this time, the number and separation distance of the ring-shaped protrusions 154 may be determined in various ways depending on the rotation speed of the rotating part 110 and the flow rate of the refrigerant (R).

The first non-contact seal 150 is a non-contact seal installed when the flow rate of the refrigerant (R) is greater than the set flow rate, and the pressure drop effect of the refrigerant (R) can be increased by increasing the flow path of the refrigerant (R). Leakage of the refrigerant (R) can be reduced by interfering with the flow of (R).

In addition, the second non-contact seal 160 may be provided to reverse the flow of the refrigerant (R) according to the principle of the Archimedes spiral water pump. As shown in FIGS. 8 and 9, the second non-contact seal 160 is a second seal mounted in a cylindrical shape on one of the surfaces of the connecting portion of the rotating portion connection pipe 111 and the stationary portion connecting pipe 121. A spiral protrusion ( 164, 166).

The helical protrusions 164 and 166 may be provided in either a single helical structure or a multiple helical structure along the longitudinal direction of the second seal mounting portion 162. At this time, the number and spiral shape of the spiral protrusions 164 may be determined depending on the rotation speed of the rotating part 110 and the flow rate of the refrigerant (R).

The second non-contact seal 160 can be selectively installed in either a single-helix structure or a multi-helix structure depending on the flow rate of the refrigerant (R). For reference, if the spiral protrusions 164 and 166 are formed in a multi-helix structure, the pressure drop effect can be increased compared to the spiral protrusion 164 formed in a single helical structure.

On the other hand, the non-contact seal 140 is used to increase the flow path of the refrigerant (R) when the flow rate of the refrigerant (R) flowing into the connection part of the rotating part connection pipe 111 and the stationary part connection pipe 121 is greater than the set flow rate. The first non-contact seal 150 or the second non-contact seal 160 with a single spiral structure can be used. That is, the second non-contact seal 160 shown in FIG. 8 is formed in a single spiral structure and can be used when the flow rate of the refrigerant R is less than the set flow rate.

On the other hand, the non-contact seal 140 reduces the backflow efficiency of the refrigerant (R) when the flow rate of the refrigerant (R) flowing into the connection part of the rotating part connection pipe 111 and the stationary part connection pipe 121 is less than the set flow rate. To increase this, a second non-contact seal 160' with a multi-helix structure can be used. That is, the second non-contact seal 160' shown in FIG. 9 is formed in a multi-helix structure and can be used when the flow rate of the refrigerant R is greater than the set flow rate. A pair of spiral protrusions 164 and 166 may be formed in a spiral structure on the outer peripheral surface of the second seal mounting portion 162 as described above.

For reference, in this embodiment, the non-contact seal 140 may be installed on the outer peripheral surface of the connection portion of the second refrigerant supply pipe 122 and the outer peripheral surface of the connection portion of the first refrigerant discharge pipe 113, respectively. At this time, since the second refrigerant supply pipe 122 is maintained in a stationary state, the first non-contact seal 150 can be applied to the outer peripheral surface of the connection portion of the second refrigerant supply pipe 122. In addition, because the first refrigerant discharge pipe 113 rotates together with the rotating part 110, the first non-contact seal 150 of a single spiral structure can be applied to the outer peripheral surface of the connection portion of the first refrigerant discharge pipe 113.

As described above, the embodiments of the present invention have been described with specific details such as specific components and limited embodiments and drawings, but this is only provided to facilitate a more general understanding of the present invention, and the present invention is limited to the above embodiments. This does not mean that various modifications and variations can be made from these descriptions by those skilled in the art. Accordingly, the spirit of the present invention should not be limited to the described embodiments, and all claims that are equivalent or equivalent to the claims as well as the claims described below shall fall within the scope of the spirit of the present invention.

100, 200: Coupling structure of cryogenic superconducting rotator
110: Rotating part
111: Rotating unit connection pipe
112: First refrigerant supply pipe
113: First refrigerant discharge pipe
114: first vacuum tube
114a: Vacuum tube joint
120: stopper
121: Stop connection pipe
122: Second refrigerant supply pipe
123: Second refrigerant discharge pipe
124: second vacuum tube
130: Magnetic fluid seal
140: Non-contact seal
150: first non-contact seal
160, 160': second non-contact seal
170: Coupling pipe
172: Refrigerant circulation pipe
C: Coupling part
R: Refrigerant (liquid refrigerant)
H: Gaseous refrigerant (hydrogen)

Claims (12)

a rotating part that rotates in a cryogenic superconducting state and has a first refrigerant flow path therein for flowing a cryogenic refrigerant;
A stop part coupled to the rotating part to rotatably support the rotating part, and having a second refrigerant flow path connected to the first refrigerant flow path to enable supply and discharge of the refrigerant to the first refrigerant flow path. and
It includes a magnetic fluid seal disposed on the coupling part of the stationary part and the rotating part, and maintaining a vacuum state by sealing the coupling part of the stationary part and the rotating part,
A cylindrical stop connection pipe is formed in the coupling part of the stop part, and a cylindrical stop connection pipe is formed in the coupling part of the rotating part with a diameter that can be inserted into the stop connection pipe so as to be axially coupled to the stop connection pipe. Coupling structure of a cryogenic superconducting rotator, characterized in that a rotating part connection pipe is formed.
According to paragraph 1,
The rotating unit connection pipe is provided as a multi-concentric pipe structure having different diameters while sharing the same first concentric axis,
The coupling structure of the cryogenic superconducting rotator, characterized in that the stop connection pipe is provided as a multi-concentric pipe structure having different diameters corresponding to the rotating section connection pipe while sharing the same second concentric axis as the first concentric axis. .
According to paragraph 2,
The rotating part connecting pipe and the stationary connecting pipe are,
The first concentric axis and the second concentric axis are inserted into each other and rotatably connected as they move in a connection direction that approaches each other,
A coupling structure of a cryogenic superconducting rotator, characterized in that it is separated as it moves in a separation direction away from each other along the first concentric axis and the second concentric axis.
According to paragraph 3,
The rotating part connecting pipe is,
a first refrigerant supply pipe forming a first refrigerant supply passage that receives the refrigerant from the stop connection pipe and supplies it to the inside of the rotating part;
A second refrigerant discharge is formed to have a larger diameter than the first refrigerant supply pipe and is disposed inside the first refrigerant supply pipe, and discharges the refrigerant from the rotating part to the stop connection pipe between the first refrigerant supply pipe. A first refrigerant discharge pipe forming a flow path; and
a first vacuum tube provided to form a vacuum space surrounding the outside of the second refrigerant discharge pipe;
Coupling structure of a cryogenic superconducting rotator including.
According to paragraph 4,
The stop connection pipe is,
a second refrigerant supply pipe rotatably connected to the first refrigerant supply pipe and forming a second refrigerant supply passage for supplying the refrigerant to the first refrigerant supply pipe;
It is formed to have a larger diameter than the second refrigerant supply pipe, the second refrigerant supply pipe is disposed therein, is rotatably connected to the first refrigerant discharge pipe, and is connected to the first refrigerant discharge pipe between the second refrigerant supply pipe and the first refrigerant discharge pipe. a second refrigerant discharge pipe forming a second refrigerant discharge passage for discharging the refrigerant to the outside of the stopper; and
a second vacuum tube rotatably connected to the first vacuum tube and provided to form a vacuum space surrounding an outside of the second refrigerant discharge pipe;
Coupling structure of a cryogenic superconducting rotator including.
According to clause 5,
Inside the rotating part, the refrigerant circulation pipe forms a refrigerant circulation passage that guides the refrigerant supplied to the first refrigerant supply pipe to the rotor of the rotating part and then guides the refrigerant that cooled the rotor to the first refrigerant discharge pipe. This is prepared,
A coupling structure for a cryogenic superconducting rotor, wherein a plurality of the refrigerant circulation pipes are formed radially around the first refrigerant discharge pipe according to the arrangement position of the rotor.
According to clause 5,
A cylindrical vacuum tube coupling portion for inserting the second vacuum tube is formed at an end of the first vacuum tube,
The ferrofluid seal is disposed at a connection portion of the vacuum tube coupling portion and the second vacuum tube to seal a gap between the vacuum tube coupling portion and the second vacuum tube,
The coupling structure of a cryogenic superconducting rotor, characterized in that the connection passage is formed along a gap between the vacuum tube coupling portion and the second vacuum tube.
In clause 7,
One end of the vacuum tube coupling portion is connected to the second refrigerant discharge pipe to rotate the vacuum tube coupling portion together with the second refrigerant discharge pipe, and the other end of the vacuum tube coupling portion is connected to the magnetic fluid seal,
A coupling structure for a cryogenic superconducting rotator, characterized in that a coupling pipe is disposed outside the vacuum tube coupling portion in a shape surrounding the vacuum tube coupling portion to protect the vacuum tube coupling portion.
According to clause 5,
It further includes a non-contact seal disposed at a connection portion of the rotating part connection pipe and the stationary part connection pipe and reducing leakage of the refrigerant,
The connection part of the rotating part connection pipe and the stop part connection pipe includes a connection part of the first refrigerant supply pipe and the second refrigerant supply pipe, and a connection part of the first refrigerant discharge pipe and the second refrigerant discharge pipe. Coupling structure of superconducting rotator.
According to clause 9,
The non-contact seal is,
A cryogenic superconducting rotor, characterized in that it is provided with at least one of a first non-contact seal that blocks the flow of the refrigerant and increases the flow path of the refrigerant, or a second non-contact seal that reverses the flow of the refrigerant according to the principle of the Archimedes spiral pump. Coupling structure.
According to clause 10,
The first non-contact seal includes: a first seal mounting portion mounted in a cylindrical shape on one of the surfaces of the connecting portion of the rotating portion connecting pipe and the stationary portion connecting pipe; And a ring-shaped protrusion protruding in a ring-shaped structure from the inner peripheral surface or outer peripheral surface of the first seal mounting portion so as to not contact the other surface of the connecting portion of the rotating portion connecting pipe and the stopping portion connecting pipe.
The second non-contact seal includes: a second seal mounting portion mounted in a cylindrical shape on one of the surfaces of the connecting portion of the rotating portion connecting pipe and the stationary portion connecting pipe; and a spiral protrusion protruding in a spiral structure from the inner peripheral surface or the outer peripheral surface of the second seal mounting portion so as to be non-contact with the other surface of the connecting portion of the rotating portion connecting pipe and the stopping portion connecting pipe. A coupling structure of a cryogenic superconducting rotating machine comprising a.
According to clause 11,
The non-contact seal is,
If the flow rate of the refrigerant flowing into the connection between the rotating part connection pipe and the stationary part connection pipe is greater than the set flow rate, the first non-contact seal or the second non-contact seal of a single spiral structure is installed to increase the flow path of the refrigerant. do,
When the flow rate of the refrigerant flowing into the connection between the rotating part connection pipe and the stationary part connection pipe is less than the set flow rate, the second non-contact seal of a multi-helix structure is installed to increase the counterflow efficiency of the refrigerant. Coupling structure of cryogenic superconducting rotator.