KR102179619B1 - Very Low Temperature Cooling Device And Connecting Structure of Superconducting Device - Google Patents

Abstract

The present invention is a cryogenic cooling device and a superconducting device capable of replacing the detection sensor, etc., without releasing the vacuum state of the cryogenic cooling device and the entire system connected thereto when repairing or replacing a detection sensor such as a temperature sensor of a cryogenic cooling device It relates to a connection structure.

Description

Very Low Temperature Cooling Device And Connecting Structure of Superconducting Device}

The present invention relates to a cryogenic cooling device and a connection structure for a superconducting device.

Cryogenic cooling technology has been widely used and researched in various fields, including power transmission technology using superconductors, medical technology, nuclear fusion basic technology, and satellite-related technology.

A method commonly used as a cryogenic cooling method includes a cooling unit for cooling by using a refrigerant such as liquid nitrogen circulating outside a cooling container in which the object to be cooled is accommodated, and a method in which a gong hole for vacuum insulation is provided outside the cooling unit. Can be used.

In this way, the object to be cooled is cooled by the refrigerant cooled to the cryogenic temperature, and the entry of heat is blocked through the vacuum insulator to stably maintain the cryogenic state.

Such cryogenic cooling often requires that cooling conditions be kept constant. For example, in the case of a superconductor, since the electrical resistance converges close to zero, it has a characteristic that it has a large current transmission ability even at a low voltage, but when the cryogenic condition is released, the resistance of the superconductor increases rapidly, and normal power transmission is impossible. , Safety accidents, etc. may occur.

Therefore, the cryogenic cooling device must keep the cryogenic state of the object to be cooled stably, and furthermore, it must continuously monitor whether the cryogenic state of the object to be cooled is stably maintained as intended.

Accordingly, the cryogenic cooling device may include a temperature sensor for measuring the temperature of the object to be cooled.

For such a temperature sensor, a method of directly measuring the temperature of a cooling object or a method of directly measuring the temperature of a liquid refrigerant may be considered, but it is often difficult to install a temperature sensor on the cooling object or a refrigerant, and electrical connection of the cooling sensor is required. For the maintenance or repair of the temperature sensor, in case of heat intrusion through wiring, etc., and the temperature of the temperature sensor, a temperature sensor is installed on the surface of the refrigerant container forming the cooling unit and the temperature of the refrigerant container is measured. Can be estimated and further determine the temperature of the cooling object.

In this case, in case the temperature sensor has a failure or the end of its life, the vacuum state between the refrigerant container constituting the cooling unit and the vacuum container constituting the vacuum insulation unit is inevitable for maintenance and replacement of the temperature sensor.

Releasing the vacuum state for maintenance and replacement of the temperature sensor provided in the cryogenic cooling device means releasing the vacuum of the entire cooling object of the cooling device, and vacuuming the cooling device and the entire connected system again after the temperature sensor replacement The time and effort required is proportional to the size or scale of the system to which the cooling system is connected.

The present invention provides a cryogenic cooling device capable of replacing the detection sensor, etc., without releasing the vacuum state of the cryogenic cooling device and the entire system connected thereto, when repairing or replacing a detection sensor such as a temperature sensor of a cryogenic cooling device. Make it the task to be solved.

As a specific example, the present invention separates the detection sensor by releasing the vacuum in only a part of the connection structure without releasing the entire vacuum state of the connection structure for maintenance of the detection sensor provided in the connection structure for a superconducting device connected to the superconducting cable. It is an object to be solved to provide a connection structure for a superconducting device as a cryogenic cooling device that can be easily installed in a short time.

In addition, the present invention provides a connection structure for a superconducting device as a cryogenic cooling device that prevents external air and moisture from entering when the vacuum state is released to a partial area of the connection structure for maintenance of the detection sensor. Make it the task to be solved.

In order to solve the above problems, the present invention is provided outside a cooling object, comprising a refrigerant container for accommodating a circulating liquid refrigerant, and a cooling unit for cooling the cooling object; A vacuum insulator provided outside the cooling part and including a vacuum container vacuumed to vacuum insulate the cooling part; A detection sensor provided on the surface of the refrigerant container constituting the cooling unit; A detection sensor port extending through the vacuum container to a surface of the refrigerant container provided with the detection sensor, and shielding the vacuum insulation part; A cryogenic cooling device including a purge port provided outside the vacuum container and supplying an inert gas into the detection sensor port or providing a negative pressure into the detection sensor port may be provided.

In this case, the detection sensor is detachably mounted to the refrigerant container, and the detection sensor port extends from the refrigerant container toward the vacuum container, and one end thereof passes through the vacuum container to communicate with the outside. ; And a cover for sealing one end of the pipe member.

Here, the detection sensor may be detachably coupled to a mounting portion mounted on the surface of the refrigerant container.

In addition, at least some sections of the pipe member may have a corrugated pipe structure.

In this case, a connection pipe connecting the detection sensor port and the purge port may be provided, and the connection pipe may be connected to communicate with the detection sensor port at a position closer to the refrigerant container than the vacuum container.

In addition, a valve may be provided in the purge port for selectively blocking the connection pipe.

In addition, when the vacuum state inside the detection sensor port is released, an inert gas may be supplied into the detection sensor port through the purge port.

Here, when the inside of the detection sensor port is formed in a vacuum state, a negative pressure may be applied to the inside of the detection sensor port through the purge port.

In this case, the vacuum insulation portion may be divided into a plurality, and each detection sensor may be provided inside each vacuum insulation portion.

In addition, a detection sensor port and a purge port connected to the detection sensor port are provided in each of the vacuum insulation parts divided into a plurality, and the detection sensor is mounted on the side of the refrigerant container inside the detection sensor port provided in each vacuum insulation part. Can be.

In addition, in order to solve the above problem, the present invention is provided with a cryogenic portion in which a liquid refrigerant is accommodated at a lower portion, a temperature gradient portion in which a gaseous refrigerant is accommodated in the upper portion of the cryogenic portion and a temperature gradient of the gaseous refrigerant exists, and the upper portion is opened. Vessel; A vacuum container surrounding the refrigerant container to vacuum insulate the refrigerant container; A sensing sensor port configured to pass through the vacuum container in the refrigerant container and having at least one sensing sensor detachably provided for sensing the temperature of the refrigerant container or the temperature of the refrigerant accommodated in the refrigerant container; A purge port provided on an outer wall of the vacuum container to supply an inert gas into the detection sensor port or a negative pressure into the detection sensor port; A room temperature tube body that is partitioned from the refrigerant container and receives insulation oil or insulation gas to constitute a room temperature section; A sealing member for sealing the open upper portion of the refrigerant container to partition the temperature gradient part from the room temperature part; And a conductor wire connected to the superconducting conductor layer of the superconducting cable in the liquid refrigerant of the refrigerant container, passing through the sealing member and extending to the room temperature tube body; providing a connection structure for a superconducting device comprising: I can.

In addition, at least a portion of the refrigerant container may be provided with a mounting portion in which the detection sensor is detachably mounted.

Here, the detection sensor port is a pipe member extending from the refrigerant container toward the vacuum container and having one end thereof passing through the vacuum container to communicate with the outside; And a cover for sealing one end of the pipe member.

In addition, at least part of the pipe member may include a heat conduction preventing means for increasing a heat conduction path between the refrigerant container and the vacuum container.

In addition, the heat conduction preventing means may be formed of an uneven portion or a corrugated pipe provided on at least a portion of the pipe member.

In addition, a signal terminal to which a cable extending from the detection sensor is electrically connected may be mounted on the cover.

In this case, a connection pipe connecting the detection sensor port and the purge port may be further provided.

In addition, the connection pipe may be connected to the detection sensor port adjacent to the refrigerant container.

In this case, a valve may be further provided to selectively block the connection pipe at a predetermined position of the connection pipe outside the vacuum container.

Here, when the vacuum state inside the detection sensor port is released, an inert gas is supplied into the detection sensor port through the purge port and the connection pipe, and when the inside of the detection sensor port is formed in a vacuum state, the A negative pressure may be provided through the purge port inside the detection sensor port.

In addition, in order to solve the above problem, the present invention provides a refrigerant container in which a refrigerant is accommodated, a vacuum container surrounding the refrigerant container to vacuum insulate the refrigerant container, and the refrigerant container penetrates the vacuum container. For a superconducting device having a detection sensor port provided with a cover at one end and detachably provided with a detection sensor for sensing the temperature of the refrigerant, and a purge port provided on the outer wall of the vacuum container and connected to the detection sensor port A method of mounting a detection sensor of a connection structure, the method comprising: supplying an inert gas into the detection sensor port through the purge port; Separating the cover to release a vacuum state inside the detection sensor port; And separating the detection sensor from the inside of the detection sensor port, mounting the detection sensor inside the detection sensor port, and providing a negative pressure into the detection sensor port through the purge port. It is possible to provide a method of mounting a detection sensor for a connection structure for a superconducting device.

According to the present invention, when a detection sensor such as a temperature sensor is provided in a cryogenic cooling device and a connection structure for a superconducting device as an example, the space between the refrigerant container constituting the cooling unit and the vacuum container constituting the vacuum insulation unit is divided, and further By providing a separate detection sensor port providing a space in which the detection sensor is mounted, separation and installation of the detection sensor can be conveniently performed within a short time. That is, when the detection sensor is removed or mounted, the vacuum state of the cryogenic cooling device and the entire system including the connection structure for a superconducting device and a superconducting cable as an example thereof is not released, but only the vacuum state of the detection sensor port is released. Thus, separation and installation of the detection sensor can be performed easily and quickly.

In addition, the cryogenic cooling device according to the present invention and the connection structure for a superconducting device as an example thereof include a purge port capable of selectively providing an inert gas and a negative pressure to the detection sensor port together with the detection sensor port, Before the vacuum state inside the detection sensor port is released for maintenance, an inert gas is supplied into the detection sensor port through the purge port to prevent external air and moisture from penetrating into the detection sensor port. have. Furthermore, when the inside of the detection sensor port is made into a vacuum state after the installation of the detection sensor, negative pressure is provided to the inside of the detection sensor port through the purge port to quickly and easily bring the inside of the detection sensor port into a vacuum state. I can.

In addition, in the case of configuring the cryogenic cooling device according to the present invention and the connection structure for a superconducting device as an example thereof, a vacuum constituting the vacuum insulation part is provided with a heat conduction preventing means such as a corrugated pipe extending a heat conduction path in the pipe member of the detection sensor port. The superconducting condition of the superconducting cable can be maintained by preventing heat from outside the container from being transferred to the refrigerant container constituting the cooling unit as much as possible through the sensing port unit.

Furthermore, when transmitting the temperature information obtained from the detection sensor by wire, a signal terminal is mounted on a cover that seals the detection sensor port, and the temperature information is transmitted to the outside by connecting the cable of the detection sensor to the signal terminal. I can. In this case, since a separate device or the like for transmitting the temperature information is not required, the configuration of the detection sensor port can be simplified to shorten the time and cost required for assembly and manufacturing thereof.

1 shows a configuration diagram of a cryogenic cooling device according to the present invention.
2 is a partial cut-away perspective view of a superconducting cable connected to a connection structure for a superconducting device and cooled at a cryogenic temperature as an example of a cryogenic cooling device according to the present invention.
3 shows a cross-sectional view of FIG. 2.
4 is a cross-sectional view of a connection structure for a superconducting device as an example of a cryogenic cooling device according to the present invention.
5 is a perspective view of a connection structure for a superconducting device as an example of a cryogenic cooling device according to the present invention.
6 shows a cross-sectional view of FIG. 5.
7 is a partial enlarged cross-sectional view of area'A' of FIG. 6.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art. The same reference numbers throughout the specification denote the same elements.

1 shows a configuration diagram of a cryogenic cooling device according to the present invention.

The cryogenic cooling device 1 according to the present invention vacuums the cooling unit 200 and the cooling unit 200 in which the cooling target 100 is disposed in the center so that cooling by a refrigerant is performed outside the cooling target 100. It is provided with a vacuum insulation part 500 for insulating.

The cooling object 100 may be, for example, a core part including a superconductor in a superconducting cable. A detailed description of the superconducting cable will be described again in detail with reference to FIG. 2 below.

The cryogenic cooling device 1 according to the present invention shown in FIG. 1 can be applied in various ways as long as it is a cooling target 100 requiring cryogenic cooling.

The cryogenic cooling device 1 according to the present invention includes a cooling unit 200 for cooling the cooling target 100 by returning a liquid refrigerant to cool the cooling target to cryogenic temperatures, and the cooling unit ( It may be configured to include at least one detection sensor 2820, such as a temperature sensor for detecting the temperature of the cooling object 100, including a vacuum insulation unit 500 surrounding the 200.

The cooling unit 200 may include a refrigerant flow path that is supplied with a liquid refrigerant cooled from the outside of the cryogenic cooling device to heat exchange with a cooling object, exits the cooling device, is recooled, and is supplied back to the cooling device.

Specifically, the cryogenic cooling device according to the present invention includes a refrigerant container 300 that is provided outside a cooling object and accommodates a circulating liquid refrigerant, a cooling unit 200 for cooling the cooling object, and the cooling unit ( 200) a vacuum insulator 500 provided on the outside and including a vacuum container 600 vacuumed to vacuum insulate the cooling part 200, the refrigerant container 300 constituting the cooling part 200 ), the detection sensor 2820 provided on the surface of the vacuum container 600 and extending to the surface of the refrigerant container 300 provided with the detection sensor 2820, and the vacuum insulation part 500 Shielded detection sensor port 2800, a purge provided outside the vacuum container 600 to supply an inert gas into the detection sensor port 2800 or provide a negative pressure inside the detection sensor port 2800 A port 2900 may be included.

The detection sensor 2820 of the cryogenic cooling device according to the present invention may be a temperature sensor for indirectly measuring the temperature of the cooling object 100.

In order to directly mount the detection sensor 2820 on the cooling target, the cooling part through which the refrigerant flows must pass through the cooling part through which the refrigerant flows in order to extract the information detected by the detection sensor 2820 to the control part of the external device, and thus constitute a cooling part. A method of mounting on the side of the refrigerant container 300 may be used.

Since the refrigerant container 300 is made of a metal material, the temperature of the refrigerant and furthermore, the temperature of the cooling target may be determined through the temperature of the detection sensor 2820 mounted on the side of the refrigerant container.

In addition, in the case of maintenance of the detection sensor 2820, the cryogenic cooling device according to the present invention installs a detection sensor 2829 so as not to destroy the entire vacuum of the vacuum insulation part 500 constituting the cryogenic cooling device. It has a sensor port 2800 for.

The detection sensor port 2800 divides the area where the detection sensor is mounted into a very small area and detects by releasing only the vacuum of the detection sensor 2820 port 2800 when the detection sensor needs to be replaced or repaired as a separately set vacuum area. Since maintenance of the sensor 2820 is possible, the entire vacuum insulation part 500 may not be affected.

In addition, a plurality of vacuum insulation parts 500 constituting the cryogenic cooling device according to the present invention may be provided in one cooling device.

That is, the embodiment shown in FIG. 1(a) shows an example in which one vacuum insulation part 500 is provided in a cryogenic cooling device, and in the implementation shown in FIG. 1(b), one cryogenic cooling device is configured. An example in which the vacuum insulator 500 is composed of a first vacuum insulator 300a, a second vacuum insulator 300b, and a third vacuum insulator 300c is shown.

When the vacuum insulator 500 for vacuum insulating the cooling unit in a cryogenic state inside one cryogenic cooling device is divided into a plurality of pieces, a problem such as damage to the vacuum container constituting the cryogenic cooling device occurs or the above-described Even when a problem such as damage to the detection sensor port occurs, only the vacuum of a specific vacuum insulation part is released, preventing the vacuum of the entire system from being destroyed together, and the time to repair the system can be greatly shortened.

Further, in the cryogenic cooling device 1 according to the present invention, the detection sensor port must also be maintained in a vacuum state in a general operating state. However, in the situation where the detection sensor is replaced, the vacuum state of the detection sensor port must be released.

In this case, the refrigerant container is in a cryogenic state, and the detection sensor mounted on the refrigerant container may cause severe frost at the same time as the vacuum of the detection sensor port is released, and this frost makes it difficult to separate or replace the temperature sensor. There is a need for a method of releasing the vacuum of the sensor port and preventing the occurrence of frost by blocking the inflow of external humid air. Therefore, the purge port 2900 is provided on the outer wall of the vacuum container 2400, and when the detection sensor port 2800 is vacuum released, an inert gas is supplied into the detection sensor port, or the detection sensor port 2800 In a situation where) needs to be evacuated, negative pressure may be provided into the detection sensor port 2800.

In order to easily achieve this purpose, a connection pipe 2910 connecting the detection sensor port 2800 and the purge port 2900 is provided, and the connection pipe 2910 is more than the vacuum container 600. It is preferable that it is connected to communicate with the detection sensor port 2800 at a position close to the container 300.

That is, when the vacuum of the detection sensor port 2800 is released, inert gas or the like injected through the purge port is most effectively supplied to the detection sensor.

And, as shown in Figure 1 (b), when a plurality of the vacuum insulator 500 is partitioned and provided, the detection sensors 2800a, 2800b, inside each vacuum insulator 300a, 300b, 300c, 2800c) is provided and may be provided with a detection sensor port and a purge port for maintenance of each detection sensor.

In the embodiment shown in FIG. 1(b), a first detection sensor port 2800a, respectively, in the first vacuum insulation part 300a, the second vacuum insulation part 300b, and the third vacuum insulation part 300c, A second detection sensor port (2800b) and a third detection sensor port (2800c) are provided, the first purge port (2900a), the second purge port (2900b) and connected to each of the detection sensor port by a connector, and A third purge port 2900c may be provided.

A detection sensor 2820 constituting the cryogenic cooling device shown in Figs. 1(a) and 1(b) is detachably mounted to the refrigerant container 300, and the detection sensor port 2800 is the refrigerant container A pipe member 2830 extending toward the vacuum container 600 at 300 and having one end thereof in communication with the outside through the vacuum container 600, and a cover sealing one end of the pipe member 2830 It may be configured to include (2840).

In addition, the information detected by the detection sensor 2820 is drawn to the outside via the detection sensor port 2800, the cable 2824 connected to the detection sensor 2820, as shown in Figure 1 (a). It is configured to be configured to receive detection information through the cable 2824.

In addition, as shown in FIG. 1(b), a signal terminal 2842 to which a cable 2824 extending from the detection sensor 2820 is electrically connected may be mounted on the cover 2840. That is, a signal terminal 2842 is mounted through the cover 2840, and a cable 2824 extending from the detection sensor 2820 is electrically connected to one end of the signal terminal 2842, and the signal terminal 2842 ) Can be configured to mount a separate connector for detection information. Accordingly, as shown in FIG. 1 (a), the cable may be configured so that it is not directly exposed, and connectivity with other peripheral devices may be improved.

In addition, the detection sensor 2820 may be directly attached or mounted on the refrigerant container as shown in FIG. 1(a), but as shown in FIG. 1(b), the surface of the refrigerant container 300 It may be detachably fastened to the mounted mounting portion 2810.

When the detection sensor 2820 is provided with a fastening hole for fastening by a fastening member such as a bolt 2822, it is configured to be mounted on the mounting part 2810 made of metal, so that the detection sensor 2820 can be firmly fixed. have.

In addition, some regions of the pipe member 2830 may be configured in a corrugated pipe 2834. The corrugated pipe 2834 may minimize heat conduction by increasing a heat transfer path of heat conduction.

A valve 2912 for selectively blocking the connection pipe 2910 may be provided in the purge port to selectively control supply of inert gas or application of vacuum pressure.

When the vacuum state inside the detection sensor port 2800 is released through the purge port 2900, an inert gas is supplied into the detection sensor port 2800 through the purge port 2900, or the detection When forming the inside of the sensor port 2800 in a vacuum state, a negative pressure may be applied to the inside of the detection sensor port 2800 through the purge port 2900.

FIG. 2 is a partially cut-away perspective view of a superconducting cable connected to a connection structure for a superconducting device and cooled at a cryogenic temperature as an example of a cryogenic cooling device according to the present invention, and FIG. 3 is a cross-sectional view of FIG. 2.

The superconducting cable 1000 includes at least two or more layers of superconductors including a former 110 from the inside to the outside, and a plurality of superconductors arranged in parallel in the longitudinal direction of the former 110 so as to surround the outside of the former 110 Consisting of a conductor layer 130, an insulating layer 140 surrounding the superconducting conductor layer 130, and a plurality of superconductors arranged side by side in the longitudinal direction of the former 110 so as to surround the outside of the insulating layer 140 The core portion 100 including at least two or more superconducting shielding layers 180 and, to cool the core portion 100, are provided outside the core portion 100, and the core portion 100 A cooling unit 200 having a refrigerant flow path for a liquid refrigerant for cooling, an inner metal tube 300 provided outside the cooling unit 200, and provided outside the inner metal tube 300, and an insulating material 401 Insulation part 400 forming a heat-insulating layer wound into a layer, vacuum insulator provided with a plurality of spacers 560 at spaced positions outside the heat-insulating part 400 to vacuum insulate the cooling part 200 500, an external metal pipe 600 provided outside the vacuum insulation part 500, and a sheath part 700 provided outside the external metal pipe 600 to form a sheath layer.

Each of the components constituting the superconducting cable is sequentially examined as follows. The former 110 provides a place to mount a flat, flat and long superconductor around the former 110 and serves as a frame for forming a shape, and may be a path through which an accident current flows. The former 110 may have a shape obtained by compressing a plurality of copper (Cu) wires 111 having a circular cross section.

Since several strands of circular copper (Cu) wires 111 constituting the former 110 are compressed into a circular shape, their surface is bound to be convex. Accordingly, in order to smooth the convex surface of the former 110, the smoothing layer 120 may be coated on the outside of the former 110. The smoothing layer 120 may be formed of semiconductive carbon paper or brass tape.

A first superconductor layer 130a in which a layer is formed by being surrounded by a plurality of superconductors may be provided outside the former 110 flattened by the smoothing layer 120. The first superconductor layer 130a may be installed so that a plurality of superconductors are adjacent to each other and surround the smoothing layer 120. In addition, as shown in FIG. 2, the superconducting conductor layer 130 may be configured as a multilayer according to the capacity of the current to be transmitted or distributed through the superconducting cable.

In the embodiment illustrated in FIG. 2, it is shown that a total of two superconducting conductor layers 130a and 130b are provided. In addition, if the superconducting conductor layers are simply stacked and arranged, the current capacity does not increase according to the skin effect of the current. In order to prevent such problems, when a superconducting conductor layer is provided as a multilayer, an insulating layer 140 may be provided between the superconducting conductor layers 130a and 130b. The insulating layer 140 may be configured in the form of an insulating tape, and is disposed between the superconducting conductor layers 130a and 130b to be stacked to insulate the superconducting conductor layers 130a and 130b from each other to prevent the skin effect of the stacked superconductor. can do.

In the embodiment shown in FIG. 2, an example in which the superconducting conductor layer 130 is composed of two layers of the first superconducting conductor layer 130a and the second superconducting conductor layer 130b is shown. A conductor layer may be provided.

In addition, the superconductors constituting each of the superconducting conductor layers 130a and 130b may be connected in parallel with respective wires constituting the former 110. This is to allow the current flowing through the superconductor to flow through the wire of the former 110 in the event of an accident such as destruction of a superconducting condition. When the superconducting condition is not satisfied in this way, the resistance of the superconductor increases, and the result is to prevent heat generation or damage to the superconductor.

An inner semiconducting layer 150 may be provided outside the second superconducting conductor layer 130b provided outside the first superconducting conductor layer 130a. The inner semiconducting layer 150 may be provided to reduce the concentration of an electric field for each area of the superconducting conductor layer 130 and to even out the surface electric field. The inner semiconducting layer 150 may be provided in a manner in which a semiconducting tape is wound.

An insulating layer 160 may be provided outside the inner semiconducting layer 150. The insulating layer 160 may be provided to increase the dielectric strength of the superconducting cable. In general, XLPE (Cross Linking-Polyethylene) or oil filled cable is used for insulation of high-voltage cables, but superconducting cables are cooled at cryogenic temperatures for superconductivity of superconductors, and the XLPE is damaged at cryogenic temperatures, resulting in insulation breakdown. In addition, since the oil filled cable may cause environmental problems, etc., the superconducting cable according to the present invention may use an insulating paper made of a general paper material as the insulating layer 160, and the insulating layer 160 It may be configured in a manner of winding the insulating paper multiple times.

An outer semiconducting layer 170 may be provided outside the insulating layer 160. The outer semiconducting layer may also be provided to alleviate the concentration of electric field in each area of the superconducting conductor layer 130 and to even out the surface electric field, and the outer semiconducting layer 170 may also be provided in a manner in which a semiconducting tape is wound. .

In addition, a superconducting shielding layer 180 may be provided outside the outer semiconducting layer 170. The method of forming the superconducting shielding layer 180 may be the same as the method of forming the superconducting conductor layer 130. When the surface of the outer semiconducting layer 170 is uneven, a smoothing layer (not shown) may be provided as needed, and a superconductor for forming the superconducting shielding layer 180 outside the smoothing layer is respectively disposed in a circumferential direction. Can be placed side by side.

A core exterior layer 190 serving as an exterior of the core unit 100 may be provided outside the superconducting shielding layer 180. The core exterior layer 190 may include various tapes or binders, and may serve as an exterior so that the core portion 100 may be exposed to a cooling layer to be described later.

In this way, the core part 100 of the superconducting cable may be configured, and in FIGS. 2 and 3 it is shown that the smoothing layer and the semiconducting layer are formed of a single layer of the same material. Can be added.

A cooling part 200 may be provided outside the core part 100. The cooling unit 200 may be provided to cool the superconductor of the core unit 100, and the cooling unit 200 may have a circulation passage for a liquid refrigerant therein. Liquid nitrogen may be used as the liquid refrigerant, and the liquid refrigerant (liquid nitrogen) circulates through the coolant flow path in a cooled state to have a temperature of -200 degrees below zero. The superconducting condition of cryogenic temperature can be maintained.

The cooling flow path provided in the cooling unit 200 may allow a liquid refrigerant to flow in one direction, and may be recovered from a junction box of a superconducting cable, recooled, and supplied to the cooling flow path of the cooling unit 200 again.

An inner metal tube 300 may be provided outside the cooling unit 200. The inner metal tube 300, together with the outer metal tube 600 to be described later, serves as an exterior of the superconducting cable to prevent mechanical damage to the core part 100 during installation and operation of the superconducting cable. The superconducting cable is wound around a drum for easy manufacture and transport, and since the cable wound around the drum is deployed and installed at the time of installation, bending stress or tensile stress may be continuously applied to the superconducting cable.

In order to maintain initial performance even in a situation where such mechanical stress is applied, an internal metal tube 300 may be provided. Therefore, the inner metal tube 300 has a corrugated structure in which ridges and depressions are repeated in the longitudinal direction of the superconducting cable to reinforce stiffness against mechanical stress, and the inner metal tube 300 is made of a material such as aluminum. Can be.

Since the inner metal tube 300 is provided outside the cooling unit 200, it may be a cryogenic temperature corresponding to the temperature of the liquid refrigerant. Accordingly, the inner metal tube 300 may be classified as a low temperature metal tube.

In addition, the inner metal tube 300 may be provided with a heat insulating part 400 including a heat insulating layer wound in several layers of a thin film coated with a polymer having low thermal conductivity on an outer circumferential surface of the inner metal tube 300. The heat insulating layer constitutes a multi-layer insulation (MLI), and heat transfer mainly due to radiation can be minimized.

Accordingly, the effect of preventing heat exchange or heat intrusion due to radiation may be obtained due to the metal film material having a high reflectance.

A vacuum heat insulating part 500 may be provided outside the heat insulating part 400. The vacuum insulation part 500 may be provided to minimize heat transfer due to convection or the like in the direction of the insulation layer that may occur when insulation by the insulation part 400 is insufficient.

The vacuum insulating part 500 may be formed by forming a spaced space outside the heat insulating part 400 and vacuumizing the spaced space.

The vacuum insulation part 500 is a spaced space provided to prevent heat intrusion from the outside at room temperature toward the core part due to convection, and may include at least one spacer 560 to form a physical spaced space. . In order to prevent contact of the heat insulation part 400 inside the vacuum insulation part 500 with the external metal tube 600 provided outside the spaced space in the vacuum insulation part 500 in the entire area of the superconducting cable, the At least two spacers 560 may be provided in the spaced space. The spacer 560 may be disposed along the longitudinal direction of the superconducting cable, and may be wound around the core part 100, specifically, the heat insulating part 400 in a spiral shape.

As shown in FIG. 2, a plurality of spacers 560 may be provided, and the number of spacers 560 may be increased or decreased according to the type or size of a superconducting cable. The superconducting cable according to the present invention may be provided with 3 to 5 spacers.

An external metal tube 600 may be provided outside the vacuum insulation part 500 provided with the spacer 560. The outer metal tube 600 may be formed of the same shape and material as the inner metal tube 300, and the outer metal tube 600 has a larger diameter than the inner metal tube 300, The formation of a space can be made possible.

In addition, a sheath part 700 that performs an exterior function for protecting the inside of the superconducting cable may be provided outside the outer metal tube 600. The sheath part may be a sheath material constituting the sheath part 700 of a conventional power cable.

4 is a cross-sectional view of a connection structure for a superconducting device as an example of a cryogenic cooling device according to the present invention.

The connection structure for a superconducting device may be a termination structure connecting the superconducting cable and the room temperature cable, or an intermediate connection structure connecting the superconducting cable and the superconducting cable, and both the termination structure and the intermediate connection structure are provided with a cooling unit and a vacuum insulation unit. It acts as a cryogenic cooling device that cools the core of the superconducting cable to be cooled.

The connection structure for a superconducting device illustrated in FIGS. 4 to 6 is an example of a termination structure connecting a superconducting cable and a room temperature cable, but is described as an example as a cooling device for cryogenic cooling.

The connection structure 2000 for a superconducting device according to the present invention is connected to a superconducting cable, and a cryogenic part (C) in which a liquid refrigerant (l) immersed in a lower portion of the conductor wire 2210 provided with a bushing on the outside is accommodated, the In communication with the cryogenic part (C), the gaseous refrigerant (g) is accommodated so as to have a temperature gradient, and the conductor wire is extended upwardly and disposed, and is partitioned from the temperature gradient (B) and the temperature gradient (B), The cryogenic part C and the temperature gradient part B may include a room temperature part A that extends and is drawn out.

The connection structure 2000 for a superconducting device includes a cryogenic part (C) in which a conductor wire connected to a superconductor cable constituting a superconducting device is immersed in a cryogenic liquid refrigerant, and a liquid level (ls) of a liquid refrigerant accommodated in the cryogenic part (C). ) As the height rises, the temperature gradient portion (B) and the temperature gradient portion (B) in which the conductor wire is disposed in the gaseous refrigerant accommodated to have a constant temperature gradient, and the insulating oil or insulating gas is separated in a room temperature environment. It may be accommodated and divided into a room temperature portion (A) from which the conductor wire is extended and drawn out.

Since the cryogenic portion (C) containing the cryogenic liquid refrigerant and the temperature gradient portion (B) containing the gaseous refrigerant have a structure in communication with each other, the liquid level (ls) of the liquid refrigerant accommodated in the cryogenic portion (C) is liquid. It can be raised or lowered according to the temperature of the refrigerant and the internal pressure.

The cryogenic part (C) and the temperature gradient part (B) may be understood as regions that divide the refrigerant container 2300 in which the liquid refrigerant is accommodated according to the position of the liquid level ls.

The conductor wire 2210 is connected to the superconducting conductor layer 130 side of the core portion 100 of the superconducting cable. Here, the meaning that the conductor wire 2210 is connected to the superconducting conductor layer 130 side means that the conductor wire 2210 is directly connected to the superconducting conductor layer 130 through connection means such as a connection part, a joint or other connection part. It is preferable to be interpreted as including both the case of being connected and the case of indirect connection by employing the connection conductor described below.

The cryogenic part (C) has an end of the superconducting conductor layer 130 constituting the core part of the superconducting cable, and the connection conductor 2120 to which the end is connected is connected at the connection part 2110, and is connected at the connection part 2110. The connected conductor 2120 may be electrically connected through a joint 2130 or the like with the conductor wire 2210. Although not shown in FIG. 4, an insulating support for relieving stress that may be generated by heat contraction may be provided near the connection part 2110.

The joint 2130 may provide a structure capable of being stably connected to the conductor wire 2210 and the like despite contraction or tension in the horizontal direction according to the temperature of the connecting conductor 2120. For example, the joint 2130 may include a braided wire connecting member made of a flexible material.

The conductor wire 2210 connected to the joint 2130 extends toward the upper end of the refrigerant container 2300. The conductor wire 2210 may be made of copper (Cu) or aluminum (Al), and a bushing 2220 may be provided outside. Of course, the conductor wire 2210 may be provided in the form of a bare conductor in which the bushing 2220 is omitted. Copper (Cu) or aluminum (Al) is an example of a conductive material such as a metal having a small electrical resistance even in the vicinity of the temperature of the liquid nitrogen when liquid nitrogen is used as the coolant temperature at which a superconducting cable is used.

The bushing 2220 may be in a form covered with an insulating material such as ethylene propylene rubber or reinforced fiber plastic (FRP) on the outside of the stainless steel pipe. In addition, the bushing may be provided with a thin electrode 2221 in a direction perpendicular to an inclined surface at the upper and lower ends 2222 in the longitudinal direction of the outer circumference, and the portion provided with the thin electrode 2221 has a tapered shape. I can. The thin electrode 2221 provided in the bushing 2220 may be employed as an electric field relaxation means.

The liquid refrigerant 1 provided in the cryogenic part C and the gaseous refrigerant g of the temperature gradient part B may be stored in a refrigerant container 2300 containing a refrigerant. The refrigerant container can be made of a metal such as stainless steel having excellent strength.

The refrigerant container 2300 includes a cryogenic portion C in which a liquid refrigerant is accommodated at a lower portion, and a temperature gradient portion in which a gaseous refrigerant g is accommodated in an upper portion of the cryogenic portion C to have a temperature gradient of the gaseous refrigerant g It can be understood as having (B). The refrigerant container 2300 may have a structure in which a liquid refrigerant 1 is accommodated in a lower portion, a gaseous refrigerant g is accommodated in an upper portion thereof, and a lower portion of the conductor wire 2210 is immersed. In addition, the liquid level ls of the liquid refrigerant 1 accommodated under the refrigerant container 2300 may be raised or lowered according to an internal temperature or pressure. The gaseous refrigerant g may be gaseous nitrogen when the liquid refrigerant is liquid nitrogen.

The refrigerant container 2300 is connected to the cooling part 200 of the superconducting cable 1000 described above, so that the liquid refrigerant in the refrigerant container 2300 may circulate to the cooling part 200.

The connection structure 2000 for a superconducting device according to the present invention may include a sealing member 2600 for sealing the temperature gradient part B in a state partitioned from the room temperature part A.

The upper end of the refrigerant container 2300 may have an open structure, and the sealing member 2600 sealing the refrigerant container 2300 may be made of a material such as epoxy as a plastic having rich weather resistance and corrosion resistance. have.

A room temperature portion (A) may be provided above the temperature gradient portion (B) around the sealing member 2600.

The room temperature part A may be disposed with the conductor wire 2210 extending inside, and the room temperature part enclosing the conductor wire 2210 and receiving insulating oil or insulating gas (air or SF6 gas, etc.) A tube body 2700 may be provided. The room temperature tube body 2700 may have a magnetic tube shape.

The conductor wire 2210 passing through the room temperature portion A can be drawn out while minimizing an impact due to temperature change.

In addition, a vacuum container 2400 surrounding the refrigerant container 2300 may be provided to vacuum insulate the refrigerant container 2300. The vacuum container 2400 may be configured to communicate with the vacuum insulating part 500 of the superconducting cable, and may be configured to surround the refrigerant container. In FIG. 4, the vacuum container may extend to an upper portion of the refrigerant container 2300 to enable vacuum insulation of the refrigerant.

Meanwhile, the connection structure 2000 for a superconducting device may further include a detection sensor provided in the cryogenic part or the temperature gradient part for the temperature of the cryogenic part and the temperature gradient part. The detection sensor may be a temperature sensor (T).

The temperature sensor T may be provided on an outer wall of the refrigerant container 2300 and may be provided to measure the temperature of the refrigerant container or the refrigerant accommodated in the refrigerant container. The temperature sensor (T) may be attached to the outer wall of the refrigerant container 2300 to measure the surface temperature of the refrigerant container 2300, or the temperature of the liquid refrigerant or gaseous refrigerant accommodated inside the refrigerant container 2300. You can also measure it yourself. The embodiment shown in FIG. 4 shows a case in which the temperature sensor T is provided on the outer wall of the refrigerant container 2300 to measure the surface temperature of the refrigerant container 2300.

When a failure occurs in the temperature sensor T, or the life of the temperature sensor is over, it is essential to release the vacuum state between the refrigerant container and the vacuum container for maintenance and replacement of the temperature sensor. However, as described above, the vacuum container of the connection structure and the vacuum insulation portion of the superconducting cable communicate with each other to form one vacuum system. Therefore, releasing the vacuum state for maintenance or replacement of the temperature sensor means releasing the vacuum state of the entire system including the termination structure and the superconducting cable. As a result, the maintenance of the temperature sensor requires a lot of time and cost because it is necessary to release the vacuum state of the entire system including the termination structure and the superconducting cable. Particularly, after maintenance of the temperature sensor, it takes a significant amount of time to re-mount the temperature sensor to bring the entire system including the termination structure and the superconducting cable into a vacuum state, resulting in very poor workability.

Therefore, hereinafter, when the temperature sensor is separated for maintenance of the temperature sensor, the work can be conveniently completed in a shorter time without the need to release the vacuum state of the entire system including the termination structure and the superconducting cable. Let's take a look at the termination structure.

5 is a perspective view of a connection structure for a superconducting device as an example of a cryogenic cooling device according to the present invention, and FIG. 6 is a cross-sectional view of FIG. 5.

Compared with the above-described embodiment of FIG. 4, the termination structure 2000 according to this embodiment has a detection sensor 2820 (see FIG. 7) detachably provided, and the vacuum container 2400 is provided in the refrigerant container 2300. The difference in that it has a detection sensor port 2800 configured to penetrate through and a purge port 2900 that supplies an inert gas to the detection sensor port 2800 or provides a negative pressure inside the detection sensor port 2800 There is. Hereinafter, it looks at the differences.

5 and 6, the termination structure 2000 includes a detection sensor port 2800 and a purge port 2900 protruding to the outside of the vacuum container 2400 compared to the termination structure of the above-described embodiment. do.

The detection sensor port 2800 is configured to pass through the vacuum container 2400 from the refrigerant container 2300, and senses the temperature of the refrigerant container 2300 or the temperature of the refrigerant accommodated in the refrigerant container 2300. At least two detection sensors 2820 may be detachably provided. In addition, the purge port 2900 may be provided on the outer wall of the vacuum container 2400 to supply an inert gas into the detection sensor port 2800 or provide a negative pressure into the detection sensor port 2800. have.

The detection sensor port 2800 and the purge port 2900 may be provided in the form of an assembly for mounting the detection sensor 2820, along the surface of the vacuum container 2400 as shown in FIG. It may be provided in plurality. In this case, it is possible to mount all the detection sensors 2820 provided in the termination structure 2000 to the detection sensor port 2800, but it is possible to consider the time and cost required for assembling and manufacturing the termination structure 2000. In this case, it is preferable to mount some of the detection sensors 2820 provided in the termination structure 2000 to the detection sensor port 2800.

That is, some of the detection sensors are mounted on the surface of the refrigerant container 2300 as in the related art (shown as'T' in the drawing), and the rest are mounted using the detection sensor port 2800 as in this embodiment. can do. In this case, even when maintenance of the detection sensor 2820 provided in the termination structure 2000 is required, maintenance of the detection sensor 2820 is performed quickly and easily through maintenance through the detection sensor port 2800. can do. Of course, it is desirable to perform maintenance on the entire detection sensor that needs maintenance among the detection sensors 2820 of the termination structure 2000, but the detection sensor installed in the conventional method is not required to be separated and remounted for its maintenance. Since the time and cost are significantly increased, according to the present embodiment, only the detection sensor 2820 installed in the detection sensor port 2800 is maintained to reduce the stop time of the termination structure 2000 in an emergency situation or a situation equivalent thereto. It can be shortened and restarted in a short time.

FIG. 7 is a partial enlarged cross-sectional view illustrating the configurations of area'A' of FIG. 6, that is, the detection sensor port 2800 and the purge port 2900.

Referring to FIG. 7, the detection sensor port 2800 extends from the refrigerant container 2300 toward the vacuum container 2400, and one end thereof passes through the vacuum container 2400 to communicate with the outside. A member 2830 and a cover 2840 sealing one end of the pipe member 2830 are provided.

The pipe member 2830 serves to separate or partition a space between the refrigerant container 2300 and the vacuum container 2400 and a space in which the detection sensor 2820 is mounted. That is, the inside of the pipe member 2830 maintains a vacuum state as will be described later to serve as heat insulation and provides a separate mounting space for the detection sensor 2820 mounted therein. Therefore, in the case of separating the detection sensor 2820 mounted inside the pipe member 2830, the detection sensor 2820 is simply and quickly released by releasing only the vacuum state inside the pipe member 2830. It becomes possible. Even when the detection sensor 2820 is mounted again to make the inside of the pipe member 2830 in a vacuum state, the inner space of the pipe member 2830 is relatively very small compared to the vacuum system of the terminal structure and the superconducting cable. Therefore, it becomes possible to make a vacuum state within a relatively short time.

Since the pipe member 2830 communicates with the outside through the vacuum container 2400 at the outer wall of the refrigerant container 2300, heat outside the vacuum container 2400 is transmitted to the refrigerant container 2300 by conduction. I can. In this case, the temperature of the refrigerant inside the refrigerant container 2300 may be increased, thereby affecting the superconducting condition. Accordingly, the pipe member 2830 may include at least a part of a heat conduction preventing means for increasing a heat conduction path between the refrigerant container 2300 and the vacuum container 2400. The heat conduction preventing means may be implemented in various ways, for example, the heat conduction preventing means may be formed of an uneven portion or a corrugated pipe 2834 provided on at least a part of the pipe member 2830. 7 shows a case where the heat conduction preventing means is made of a corrugated pipe 2834, but is not limited thereto.

Specifically, the pipe member 2830 includes a first pipe part 2832 extending from an outer wall of the refrigerant container 2300 toward the vacuum container 2400 to a predetermined length, and the first pipe part 2832 A corrugated pipe 2834 connected to a predetermined length and a second pipe portion 2835 connected to the corrugated pipe 2834 to communicate with the outside of the vacuum container 2400 may be provided. In this case, the corrugated pipe 2834 may be connected to the first pipe part 2832 and the second pipe part 2835 by a method such as welding.

Meanwhile, the first pipe portion 2832, the corrugated pipe 2834, and the second pipe portion 2835 forming the pipe member 2830 may be made of a material having low thermal conductivity. The first pipe portion 2832 and the second pipe portion 2835 are made of the same material, or the first pipe portion 2832 and the second pipe portion 2835 are made of materials having different thermal conductivity from each other. It can reduce thermal conductivity.

The detection sensor 2820 inside the detection sensor port 2800 may be directly mounted on the outer wall of the refrigerant container 2300, but this may weaken the mechanical strength of the outer wall of the refrigerant container 2300. Therefore, in this embodiment, at least a part of the refrigerant container 2300 includes a mounting portion 2810 to which the detection sensor 2820 is detachably mounted, and the detection sensor port 2800 is attached to the mounting portion 2810. It can be provided.

The mounting portion 2810 may have a predetermined thickness, and may be attached to the outer wall of the refrigerant container 2300 by welding or the like. In addition, although not shown in the drawings, the mounting portion 2810 may be integrally configured with the refrigerant container 2300. In this case, the outer wall of the refrigerant container 2300 at the location where the detection sensor 2820 is to be mounted may be made relatively thicker than other parts, and the detection sensor 2820 may be mounted at the location.

When the mounting portion 2810 is provided, the detection sensor 2820 is provided to be detachably attached to the mounting portion 2810. The detection sensor 2820 may be detachably provided to the mounting portion 2810 by a fastening means such as a bolt 2822, for example. In this case, the detection sensor 2820 may be used by employing a detachable temperature sensor. Therefore, the detection sensor 2820 is mounted on the mounting part 2810 by fastening the bolt 2822 to the mounting part 2810, and the detection sensor is performed by releasing the bolt 2822. The 2820 can be easily separated from the mounting portion 2810.

Meanwhile, the open end of the detection sensor port 2800 connected to the outside of the vacuum container 2400 is sealed by a cover 2840. The cover 2840 may be coupled to the end of the pipe member 2830 by a fastening means such as a bolt. In this case, an O-ring for sealing may be provided between the cover 2840 and the end of the pipe member 2830.

Meanwhile, the detection sensor 2820 transmits information on the measured temperature of the refrigerant to an external control means (not shown), and in this case, the temperature information may be transmitted by wire or wirelessly. When selecting the detection sensor 2820, when selecting a type for transmitting the temperature information by wire in consideration of the ease of assembly and manufacturing cost of the detection sensor 2820, the detection sensor 2820 and the external There is a need to electrically connect the control means of. In this case, a signal terminal 2842 to which the cable 2824 extending from the detection sensor 2820 is electrically connected may be mounted on the cover 2840. That is, a signal terminal 2842 is mounted through the cover 2840, and a cable 2824 extending from the detection sensor 2820 is electrically connected to one end of the signal terminal 2842, and the signal terminal 2842 The other end of) may be electrically connected to the control means. In this way, by providing a configuration capable of transmitting the temperature information of the sensing sensor 2820 to the outside by wire in the cover 2840, a separate device for transmitting the temperature information is not required, so that the sensing sensor The configuration of the port 2800 is simplified, and further, time and cost required for assembly and installation can be reduced.

On the other hand, when the detection sensor 2820 is to be separated from the detection sensor port 2800, the cover 2840 is removed to release the vacuum state inside the detection sensor port 2800, and the detection sensor 2820 Is separated. However, when the termination structure 2000 is in operation, the inside of the detection sensor port 2800 is maintained in a vacuum state for vacuum insulation. Accordingly, when the cover 2840 is removed, outside air is introduced into the detection sensor port 2800 for a very short time. In this case, moisture contained in the air along with external air is also introduced into the inside of the detection sensor port 2800, and when the cover 2840 is removed, the inside of the detection sensor port 2800 is defrosted by the moisture. Can be covered with This may make it difficult to separate the detection sensor 2820 from the inside of the detection sensor port 2800, and further, may cause a malfunction even when the detection sensor 2820 is remounted. In addition, after remounting the detection sensor 2820, a means for providing a negative pressure in order to create a vacuum in the detection sensor port 2800 is required.

Accordingly, the termination structure 2000 according to the present embodiment is provided on the outer wall of the vacuum container 2400 together with the detection sensor port 2800, and supplies an inert gas into the detection sensor port 2800, or the detection A purge port 2900 for providing negative pressure into the sensor port 2800 is provided. That is, when the cover 2840 is separated by supplying an inert gas such as nitrogen to the inside of the detection sensor port 2800 through the purge port 2900 at a predetermined pressure before removing the cover 2840 In addition, it is possible to prevent external air and moisture from flowing into the detection sensor port 2800. Further, after remounting the detection sensor 2820 into the detection sensor port 2800, the cover 2840 is sealed and the negative pressure inside the detection sensor port 2800 through the purge port 2900 By providing the sensor port 2800 may be made into a vacuum state. Hereinafter, the purge port 2900 will be described in detail with reference to the drawings.

The purge port 2900 includes a port portion 2920 protruding to the outside of the vacuum container 2400, and further connects the detection sensor port 2800 and the port portion 2920 of the purge port 2900 It is provided with a connecting pipe (2910).

For example, one end of the connection pipe 2910 may be connected to the pipe member 2830 of the detection sensor port 2800, and the other end of the connection pipe 2910 may be connected to the port part 2920. . In the case of supplying an inert gas to the inside of the detection sensor port 2800 through the connection pipe 2910, it is necessary to prevent the occurrence of frost due to the inflow of external air near the detection sensor 2820. One end of the connection pipe 2910 may be connected to the detection sensor port 2800 adjacent to the detection sensor 2820. When the connection pipe 2910 is provided adjacent to the detection sensor 2820, the inert gas supplied through the connection pipe 2910 gradually diffuses from the detection sensor 2820, so that the air introduced from the outside is detected. Access to the sensor 2820 can be prevented. Specifically, the connection pipe 2910 may be adjacent to the refrigerant container 2300 and connected to the detection sensor port 2800. In this case, when the pipe member 2830 includes a first pipe part 2832, a corrugated pipe 2834, and a second pipe part 2835 as described above, one end of the connection pipe 2910 is 1 It may be connected to the pipe part 2832.

On the other hand, when the cover 2840 is removed to release the vacuum inside the detection sensor port, an inert gas is supplied into the detection sensor port 2800 through the connection pipe 2910 of the purge port 2900. When the inside of the detection sensor port 2800 is formed in a vacuum state after the detection sensor 2820 is mounted, the connection pipe 2910 of the purge port 2900 is inserted inside the detection sensor port 2800. It provides sound pressure through. Accordingly, since an inert gas supply unit or a pumping means for providing a negative pressure may be selectively connected to the end of the connection pipe 2910, the connection pipe () at a predetermined position of the connection pipe 2910 outside the vacuum container 2400 2910) may be provided with a valve (not shown) for selectively shutting off.

Hereinafter, in the connection structure 2000 for a superconducting device having the above configuration, a method of separating/installing the detection sensor 2820 for maintenance of the detection sensor will be described as follows.

First, in the case of separating the detection sensor 2820 for maintenance of the detection sensor 2820 mounted on the end structure 2000, the detection sensor port 2800 is inserted through the purge port 2900. Supply inert gas. Specifically, the connection pipe 2910 of the purge port 2900 is connected to an inert gas supply source, and an inert gas is supplied to the inside of the detection sensor port 2800 through the connection pipe 2910 at a predetermined pressure.

Subsequently, the cover 2840 of the detection sensor port 2800 is removed to release the vacuum state inside the detection sensor port 2800. In this case, since the inside of the detection sensor port 2800 is already filled with an inert gas, external air and moisture are prevented from flowing into the detection sensor port 2800 even when the cover 2840 is removed. Can be prevented.

After the cover 2840 is removed, the detection sensor 2820 inside the detection sensor port 2800 is separated from the inside of the detection sensor port 2800, and after maintenance of the detection sensor 2820, the detection sensor ( 2820 is mounted inside the detection sensor port 2800.

After the detection sensor 2820 is mounted, a negative pressure is supplied into the detection sensor port 2800 through the purge port 2900 to make the inside of the detection sensor port 2800 in a vacuum state. Specifically, the connection pipe of the purge port 2900 is connected to a pumping means, and a negative pressure is provided to the detection sensor port 2800 through the connection pipe 2910 by driving the pumping means.

Although the present specification has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims described below. You will be able to do it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all should be considered to be included in the technical scope of the present invention.

100: core part
130: superconducting layer
200: cooling unit
500: vacuum insulation part
2000: termination structure
2300: refrigerant container
2400: vacuum container
2800: detection sensor port
2900: purge port

Claims (21)

A cooling unit provided outside the cooling object, including a refrigerant container for receiving a circulating liquid refrigerant, and cooling the cooling object;
A vacuum insulator provided outside the cooling part and including a vacuum container vacuumed to vacuum insulate the cooling part;
A detection sensor provided on the surface of the refrigerant container constituting the cooling unit;
A detection sensor port extending through the vacuum container to a surface of the refrigerant container provided with the detection sensor, and shielding the vacuum insulation part; And,
A cryogenic cooling device comprising: a purge port provided outside the vacuum container to supply an inert gas into the detection sensor port or provide negative pressure into the detection sensor port. The method of claim 1,
The detection sensor is detachably mounted on the refrigerant container, and the detection sensor port extends from the refrigerant container toward the vacuum container, and one end thereof passes through the vacuum container to communicate with the outside; And a cover for sealing one end of the pipe member. The method of claim 2,
The detection sensor is a cryogenic cooling device, characterized in that the detachably fastened to the mounting portion mounted on the surface of the refrigerant container. The method of claim 2,
Cryogenic cooling apparatus, characterized in that at least some sections of the pipe member have a corrugated pipe structure. The method of claim 1,
A connection pipe connecting the detection sensor port and the purge port is provided, and the connection pipe is connected to communicate with the detection sensor port at a position closer to the refrigerant container than the vacuum container. The method of claim 5,
A cryogenic cooling device comprising a valve that selectively blocks the connection pipe at the purge port. The method of claim 5,
When releasing the vacuum state inside the detection sensor port, an inert gas is supplied into the detection sensor port through the purge port. The method of claim 5,
Cryogenic cooling device, characterized in that when forming the inside of the detection sensor port in a vacuum state, a negative pressure is applied to the inside of the detection sensor port through the purge port. The method of claim 1,
The vacuum insulation unit is divided into a plurality, and a cryogenic cooling device, characterized in that each provided with a detection sensor inside each vacuum insulation unit. The method of claim 9,
A detection sensor port and a purge port connected to the detection sensor port are provided in each of the vacuum insulation parts divided into a plurality, and the detection sensor is mounted on the side of the refrigerant container inside the detection sensor port provided in each vacuum insulation part. Cryogenic cooling device characterized by. A refrigerant container having a cryogenic portion in which a liquid refrigerant is accommodated in a lower portion, a temperature gradient portion in which a temperature gradient of the gaseous refrigerant is present by receiving a gaseous refrigerant in an upper portion of the cryogenic portion, and having an open upper portion;
A vacuum container surrounding the refrigerant container to vacuum insulate the refrigerant container;
A sensing sensor port configured to pass through the vacuum container in the refrigerant container and having at least one sensing sensor detachably provided for sensing the temperature of the refrigerant container or the temperature of the refrigerant accommodated in the refrigerant container;
A purge port provided on an outer wall of the vacuum container to supply an inert gas into the detection sensor port or a negative pressure into the detection sensor port;
A room temperature tube body that is partitioned from the refrigerant container and receives insulation oil or insulation gas to constitute a room temperature section;
A sealing member for sealing the open upper portion of the refrigerant container to partition the temperature gradient part from the room temperature part; And
And a conductor wire connected to the superconducting conductor layer of a superconducting cable in the liquid refrigerant of the refrigerant container and extending through the sealing member to the room temperature tube. The method of claim 11,
A connection structure for a superconducting device, comprising: a mounting portion in which the detection sensor is detachably mounted on at least a portion of the refrigerant container. The method of claim 11,
The detection sensor port is
A pipe member extending from the refrigerant container toward the vacuum container and having one end thereof passing through the vacuum container to communicate with the outside; And
A connection structure for a superconducting device comprising: a cover for sealing one end of the pipe member. The method of claim 13,
The pipe member is at least partially provided with a heat conduction preventing means for increasing a heat conduction path between the refrigerant container and the vacuum container. The method of claim 14,
The heat conduction preventing means is a connection structure for a superconducting device, characterized in that consisting of an uneven portion or a corrugated pipe provided in at least a part of the pipe member. The method of claim 13,
A connection structure for a superconducting device, characterized in that the cover is equipped with a signal terminal to which a cable extended from the detection sensor is electrically connected. The method of claim 11,
A connection structure for a superconducting device, further comprising a connection pipe connecting the detection sensor port and the purge port. The method of claim 17,
The connection pipe is a connection structure for a superconducting device, characterized in that adjacent to the refrigerant container and connected to the detection sensor port. The method of claim 17,
A connection structure for a superconducting device, further comprising a valve that selectively blocks the connection pipe at a predetermined position of the connection pipe outside the vacuum container. The method of claim 19,
When the vacuum state inside the detection sensor port is released, an inert gas is supplied into the detection sensor port through the purge port and the connection pipe, and the detection sensor is formed in a vacuum state inside the detection sensor port. A connection structure for a superconducting device, characterized in that to provide a negative pressure through the purge port inside the port. delete

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