KR20200085003A - Vacuum Insulation Part Dividing Device And Superconducting Cable Having The Same - Google Patents

Abstract

The present invention relates to a vacuum part dividing device that divides a vacuum part for vacuum-insulating a cooling part of a superconducting cable into a plurality of sections in a longitudinal direction of the superconducting cable to significantly reduce working time and costs required to release vacuum of the vacuum part for maintenance of the superconducting cable or re-vacuumize the vacuum part when the vacuum is broken and to quickly implement the functions of the superconducting cable and the superconducting cable having the same. The superconducting cable comprises a core part, an inner metal tube of a corrugated structure, an outer metal tube of a corrugated structure, and a vacuum part dividing device.

Description

Vacuum Division Division Device and Superconducting Cable Having The Same

The present invention relates to a vacuum unit partitioning device and a superconducting cable having the same. In more detail, the present invention divides the vacuum section for vacuum insulation of the cooling section of the superconducting cable into a plurality of sections in the longitudinal direction of the superconducting cable, thereby releasing the vacuum of the vacuum section for maintenance of the superconducting cable or when the vacuum is destroyed. It relates to a vacuum unit partitioning device and a superconducting cable having the same, which can greatly shorten the working time and the cost required to re-vacuum the vacuum unit, and to rapidly implement the present function of the superconducting cable.

Cryogenic cooling technology has been widely used and studied 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 using a refrigerant such as liquid nitrogen circulating outside the cooling container in which a cooling target is accommodated, and a method for providing a vacuum unit for vacuum insulation outside the cooling unit is used. Can.

The superconducting power system has an advantage in that a large amount of current can be transmitted even at a relatively low voltage by using a characteristic in which the resistance of the superconductor converges to zero at cryogenic temperatures.

In order to create the superconducting conditions of the superconductor constituting the superconducting cable, the cryogenic environment of the core portion having the superconductor must be guaranteed.

Therefore, in order to form a cryogenic condition that is a superconducting condition of the superconductor, the superconducting cable flows a cryogenic liquid refrigerant through a cooling unit in the form of a cooling channel outside the core, and further forms a vacuum unit outside the cooling channel to vacuum-insulate the cooling unit. As a method for preventing heat intrusion from the outside, the cryogenic state of the core portion provided with the superconducting conductor can be stably maintained.

The method of forming the vacuum part inside the superconducting cable secures a separation space capable of forming a vacuum and physically prevents contact between the inner and outer surfaces of the separation space by providing a plurality of spacers inside the space, A method of evacuating the separation space can be used.

The operation of evacuating the vacuum unit may be performed by a method of pumping the empty space inside the outer metal tube of the superconducting cable using a pump or the like.

Further, a sensor or the like for measuring the temperature of the cooling unit may be mounted on the surface of the inner metal tube, for example, to artificially release the vacuum of the vacuum unit for damage or maintenance of the sensor or damage the external metal tube, thereby destroying the vacuum state of the vacuum unit. If possible, the vacuum must be formed again in the vacuum section, but the vacuuming operation to restart the superconducting power system may take 1 to 2 weeks in proportion to the unit installation length bordering the junction box, so it acts as a great weakness as a power system. do.

The present invention divides the vacuum section for vacuum insulation of the cooling section of the superconducting cable into a plurality of sections in the longitudinal direction of the superconducting cable, releases the vacuum of the vacuum section for maintenance of the superconducting cable, or regenerates the vacuum section when the vacuum is destroyed. An object of the present invention is to solve the problem of providing a vacuum unit partitioning device and a superconducting cable having the same, which can greatly reduce the working time required for republication and the cost thereof, and to rapidly implement the present function of the superconducting cable.

In order to solve the above problem, the present invention is a core portion which is sequentially provided with a former, a superconducting conductor layer, an insulating layer and a superconducting shielding layer; In order to cool the core portion, it is provided on the outside of the core portion to form a cooling portion through which a cryogenic refrigerant flows, and an inner metal tube of a corrugated structure in which bones and floors made of aluminum or stainless steel are repeatedly formed in the longitudinal direction; In order to vacuum-insulate the inner metal tube, an outer metal tube having a corrugated structure in which a vacuum part in a vacuum state is formed outside the inner metal tube, and bones and floors made of aluminum or stainless steel are repeatedly formed in a longitudinal direction; And the outer metal pipe is divided at predetermined intervals, and is mounted between the divided outer metal pipes to divide the vacuum portion inside the outer metal pipe. A superconducting cable can be provided.

In this case, a plurality of the vacuum unit partitioning devices may be mounted spaced apart in the longitudinal direction of the superconducting cable.

In addition, the vacuum unit partitioning device may be mounted to connect the outer surface of the inner metal tube and the ends of the divided pair of outer metal tubes.

In addition, the vacuum unit partitioning device may include an insulating member mounted between the outer surface of the inner metal tube and the ends of the pair of outer metal tubes.

Here, the vacuum unit partitioning device is mounted to surround the outer surface of the inner metal tube, and includes a metal sheet to flatten the outer surface of the inner metal tube, and the heat insulating member may be mounted on the metal sheet.

In this case, the sealing member may further include at least one sealing member mounted in a circumferential direction to seal between the inner surface and the outer surface of the metal sheet.

In addition, the sealing member is configured in an O-ring shape, it may be seated in a seating groove formed on the inner surface of the heat insulating member.

In addition, the vacuum unit partitioning device is a pair of closing members for closing and connecting a space between a metal cover member mounted on the insulating member and both ends of the cover member and a pair of the outer metal pipes, respectively. It may be further provided.

Here, the closing member may be a ring member having a cross-sectional shape of an'a' shape.

In this case, the pair of finishing members may be welded to the cover member and the pair of external metal pipes, respectively.

In addition, the vacuum unit partitioning device is made of a metallic material by closing and connecting a space between a cover member made of a metal material mounted on an upper portion of the heat insulating member and both ends of the cover member and the ends of a pair of external metal tubes, respectively. A corrugated structure in which the bone and the floor are repeated may further include a corrugated member.

In addition, the corrugated member may be made of aluminum or stainless steel, and the gap between the valley and the floor may be smaller than the gap between the valley and the floor of the inner metal pipe or the outer metal pipe.

Here, the corrugated member is made of aluminum or stainless steel, and the thickness may be smaller than the thickness of the inner metal tube or the outer metal tube.

In this case, a pair of the corrugated members may be welded to the cover member and the pair of external metal tubes, respectively.

In addition, the sealing member may further include at least one sealing member mounted in a circumferential direction to seal between the outer surface and the inner surface of the cover member.

In addition, the sealing member is configured in an O-ring shape, and may be seated in a seating groove formed on an outer surface of the heat insulating member.

Here, the vacuum unit partitioning device may be configured by dividing the outer metal tube in the state where the outer metal tube is mounted outside the inner metal tube and connecting the inner metal tube with each end of the divided outer metal tube.

Here, the heat insulating member may be made of PTFE (Poly Tetra Fluoroe Thylene, Teflon) or PCTFE (Poly Chloro Tri Fluoro Ethylene) material.

In this case, the sealing member may be configured by coating a spring of high elasticity with a fluorine resin insert or fluororesin.

In addition, in order to solve the above problem, the present invention is a vacuum unit partitioning device for partitioning the vacuum unit of the superconducting cable, the cooling unit through which the refrigerant of the superconducting cable flows is provided inside, and the corrugation is repeated in the valleys and floors. A metal sheet mounted on the outer surface of the inner metal tube of the structure; An insulating member mounted outside the metal sheet; Includes; a cover member mounted on the outside of the heat insulating member, the outer metal tube of the corrugated structure is mounted to form a vacuum outside the inner metal tube and repeats the valley and the floor is divided in the longitudinal direction of the superconducting cable, divided Each end of the outer metal tube and the cover member are connected, it is possible to provide a vacuum unit partitioning device characterized in that the vacuum unit is partitioned inside each outer metal tube.

In addition, the vacuum unit partitioning device may further include a pair of finishing members connecting both ends of the cover member and each end of the pair of external metal tubes.

Here, the closing member may be a ring member having a cross-sectional shape of an'a' shape.

In this case, the vacuum unit partitioning device may further include a pair of corrugated members having a corrugated structure in which both ends of the cover member and each end of the pair of external metal tubes are repeated, and the valley and the floor are repeated. have.

In addition, the corrugated member is made of aluminum or stainless steel, and the corrugated member may have a gap between the corrugated floor and the floor, and may be smaller than the corrugated inner corrugated pipe or the outer metal corrugated floor and floor.

In addition, the corrugated member is made of aluminum or stainless steel, and the thickness of the corrugated member may be smaller than the thickness of the inner metal tube or the outer metal tube.

Here, the heat insulating member may be made of PTFE (Poly Tetra Fluoroe Thylene, Teflon) or PCTFE (Poly Chloro Tri Fluoro Ethylene) material.

In addition, at least one sealing member is provided in the circumferential direction between the outer surface of the metal sheet and the inner surface of the heat insulating member or between the outer surface of the heat insulating member and the inner surface of the heat insulating member, and the sealing member is made of a high elastic metal spring. It can be constructed by coating the resin with an insert or a fluororesin.

Further, the sealing member is configured in an O-ring shape, and may be seated in a seating groove formed on an outer surface or an inner surface of the heat insulating member.

According to the vacuum unit partitioning device according to the present invention and the superconducting cable having the same, a plurality of vacuum units for vacuum insulation of the cooling unit of the superconducting cable can be divided into a plurality in the longitudinal direction of the superconducting cable.

Therefore, according to the vacuum unit partitioning device according to the present invention and the superconducting cable having the same, the vacuum of the vacuum unit is released for maintenance of the superconducting cable, or when the vacuum is destroyed, the working time to re-vacuum the vacuum unit and accordingly The cost can be greatly reduced.

1 shows a multi-stage stripped perspective view of an end of a superconducting cable of the present invention, and FIG. 2 shows a cross-sectional view of the superconducting cable shown in FIG. 1.
Figure 3 shows a vacuum unit partition device installed on the superconducting cable of the present invention.
Figure 4 shows a cross-sectional view of one embodiment of the vacuum unit partitioning device with the core portion of the superconducting cable of the present invention removed, and Figure 5 shows its cross-sectional perspective view.
6 to 11 illustrate a process of mounting the vacuum unit partitioning device shown in FIGS. 4 and 5.
12 is a sectional view showing another embodiment of the vacuum sectioning device in a state where the core portion of the superconducting cable of the present invention is removed.
13 and 14 illustrate a process of mounting the vacuum unit partitioning device shown in FIG. 12.

Hereinafter, preferred 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 to ensure that the disclosed contents are thorough and complete, and that the spirit of the present invention is sufficiently conveyed to those skilled in the art. Throughout the specification, the same reference numbers refer to the same components.

1 shows a multi-stage stripped perspective view of an end of the superconducting cable 100 of the present invention, and FIG. 2 shows a cross-sectional view of the superconducting cable shown in FIG. 1.

The superconducting cable 1000 includes at least two layers of superconductors including a plurality of superconductors arranged side by side in the longitudinal direction of the former 110 to surround the former 110 and the former 110 from the inside. It comprises 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 a core portion 100 are provided outside the core portion 100 to cool the core portion 100. Cooling unit 200 having a refrigerant path of a liquid refrigerant for cooling, an inner metal tube 300 provided outside the cooling unit 200, and provided inside the inner metal tube 300, and insulator 401 Insulating portion 400 forming a thermally insulating layer wound by a layer, in order to vacuum insulate the cooling portion 200, a vacuum portion provided with a plurality of spacers 560 in spaced apart locations outside the insulating portion 400 ( 500), an outer metal tube 600 provided outside the vacuum part 500, and a cable jacket 700 provided outside the outer metal tube 600.

The components constituting the superconducting cable are sequentially reviewed as follows. The former 110 serves as a frame for forming a shape while providing a place for mounting a flat, flat and long superconductor around the former 110, and may be a path through which an accident current flows. The former 110 may have a shape in which a plurality of copper (Cu) elements 111 having a circular cross-section are compressed in a circular shape.

Since the copper (Cu) elemental wires 111 of a plurality of cross-sections constituting the former 110 form a twisted pair compressed in a circular shape, the surface thereof must be convex. Therefore, the smoothing layer 120 may be coated on the outside of the former 110 to smooth the convex surface of the former 110. The smoothing layer 120 may be made of a material such as semiconductive carbon paper or brass tape.

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

1 and 2 show that a total of two layers of superconducting conductor layers 130a and 130b are provided. In addition, if the superconducting conductor layer is simply stacked and disposed, the current capacity does not increase according to the skin effect of the current. In order to prevent such a problem, when the 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 formed in the form of an insulating tape, and disposed between the superconducting conductor layers 130a and 130b to be stacked to insulate the superconducting conductor layers 130a and 130b to prevent the skin effect of the superconductors stacked. can do.

In the embodiment shown in Figures 1 and 2, the superconducting conductor layer 130 is shown as an example consisting of two layers of the first superconducting conductor layer 130a and the second superconducting conductor layer 130b. A superconducting conductor layer of the layer may be provided.

In addition, the superconductors constituting each of the superconducting conductor layers 130a and 130b may be connected in parallel with the individual wires constituting the former 110. This is to ensure that the current flowing through the superconductor flows in the elemental wire of the former 110 in an accident such as destruction of the superconducting condition. When the superconducting condition is not satisfied in this way, the resistance of the superconductor is increased, and thus the heating or damage of the superconductor is prevented.

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 relieve electric field concentration in each region of the superconducting conductor layer 130 and to even the surface electric field. The inner semiconducting layer 150 may be provided in such a way that the 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, to insulate a high voltage cable, a cross linking-polyethylene (XLPE) or oil filled cable is used, but the superconducting cable is cooled to a very low temperature for superconductivity of the superconductor, and the XLPE is broken and destroyed by insulation at cryogenic temperature. There is, oil filled cable (oil filled cable) may cause environmental problems, the superconducting cable according to the present invention can be used as an insulating layer 160, an insulating paper of a general paper material, the insulating layer 160 is It may be configured by winding the insulating paper multiple times.

An external semiconducting layer 170 may be provided outside the insulating layer 160. The outer semiconducting layer may also be provided to relieve the concentration of electric field in each region of the superconducting conductor layer 130 and to even the surface electric field, and the outer semiconducting layer 170 may also be provided in a manner in which the 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 necessary, and superconductors for forming the superconducting shielding layer 180 outside the smoothing layer are circumferentially, respectively. Can be placed side by side.

The outer surface of the superconducting shielding layer 180 may be provided with a core outer layer 190 that serves as a sheath of the core portion 100. The core exterior layer 190 may include various tapes or binders, and may serve as an exterior so that the core portion 100 is exposed to a cooling layer, which will be described later.

In this way, the core portion 100 of the superconducting cable may be configured, and in FIG. 1 and FIG. 2, the smoothing layer and the semiconducting layer are shown to be composed of a single layer of the same material, but various accessory layers as required. Can be added.

A cooling unit 200 may be provided outside the core portion 100. The cooling part 200 may be provided to cool the superconductor of the core part 100, and the cooling part 200 may be provided with a circulation path of liquid refrigerant therein. Liquid nitrogen may be used as the liquid refrigerant, and the liquid refrigerant (liquid nitrogen) circulates the cooler flow path in a cooled state to have a temperature of about -200 degrees below zero, and the superconductor provided in the core portion inside the cooling portion. It is possible to maintain the superconducting condition, cryogenic temperature.

The cooling passage provided in the cooling unit 200 may allow the liquid refrigerant to flow in one direction, and is recovered from the junction box of the superconducting cable and re-cooled to be supplied to the cooling channel 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 a sheath of the superconducting cable to prevent mechanical damage to the core portion 100 during installation and operation of the superconducting cable. The superconducting cable is wound on the drum for easy manufacturing and transportation. When installing, the cable wound around the drum is deployed and installed, so bending stress or tensile stress can be continuously applied to the superconducting cable.

An internal metal tube 300 may be provided to maintain initial performance even in a situation in which such mechanical stress is applied. Therefore, the inner metal pipe 300 has a corrugated structure in which ridges and depressions are repeated in the longitudinal direction of the superconducting cable to reinforce rigidity against mechanical stress, and the inner metal pipe 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. Therefore, the inner metal tube 300 may be divided into a low temperature part metal tube.

In addition, the outer peripheral surface of the inner metal tube 300 may be provided with an insulating part 400 including an insulating layer in which a heat insulating material coated with a thin film having a low thermal conductivity on a metal film having high reflectivity is wound in several layers. The insulating layer constitutes a multi-layer insulation (MLI), and can mainly minimize heat transfer by radiation.

Therefore, it is possible to obtain an effect of preventing heat exchange or heat intrusion due to radiation due to a metal film material having a high reflectance.

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

The vacuum unit 500 may be formed by forming a separation space outside the heat insulation unit 400 and vacuuming the separation space.

The vacuum unit 500 is a separation space provided to prevent heat intrusion by convection or the like from the outside, which is room temperature, to the core portion, and may include at least one spacer 560 to form a physical separation space. Spaced apart from the spaced space in the vacuum part 500 in order to prevent the external metal tube 600 provided on the outside and the heat insulating part 400 inside the vacuum part 500 from contacting the entire area of the superconducting cable. At least two spacers 560 may be provided inside. The spacer 560 may be disposed along the longitudinal direction of the superconducting cable, and may be wound to wrap the core portion 100 outside, specifically, the heat insulating portion 400 in a spiral shape.

As shown in FIG. 1, a plurality of spacers 560 may be provided, and the number of spacers 560 may be increased or decreased depending on the type or size of the superconducting cable. Superconducting cable according to the present invention may be provided with three to five spacers.

An outer metal tube 600 may be provided outside the vacuum 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 is configured to have a larger diameter than the inner metal tube 300 through the spacer 560. The separation space can be formed.

The vacuum section 500 of the conventionally introduced superconducting cable is a configuration for minimizing heat intrusion by convection by evacuating the inside, and the vacuum section 500 is divided in the installation section of the superconducting cable connecting between the middle or end junction boxes. It was not composed of one.

Therefore, if the external metal tube 600 that partitions the vacuum section 500 in one installation section is damaged or the vacuum state of the vacuum section 500 is released for maintenance in some sections of the installation section, the entire installation section is released. The vacuum state of the vacuum unit 500 is released together.

Therefore, after the damaged portion of the superconducting cable or the maintenance of the inside is finished, the vacuuming operation of the vacuum portion is performed by a method such as a long suction for vacuuming the vacuum portion 500 again to about 10-5 Torr. The vacuuming work of the study 500 is often performed for a week or more in proportion to the length of the installation section.

In order to solve this problem, the present invention is provided with a vacuum unit partitioning device for dividing or dividing a plurality of vacuum sections of one superconducting cable to perform vacuum release of the vacuum sections for each section. Delayed explanation for this.

In addition, a cable jacket 700 may be provided outside the outer metal tube 600 to perform an external function for protecting the inside of the superconducting cable. The cable jacket 700 may be a sheath material constituting the conventional power cable jacket 700.

Figure 3 shows a vacuum unit partition device 900 installed on the superconducting cable of the present invention.

As described above, in order to maintain the cryogenic environment inside the core portion, the superconducting cable flows a cryogenic liquid refrigerant inside the inner metal tube 300 and heat-insulates 400 that is configured by winding insulation outside the inner metal tube 300. A structure in which external heat intrusion is prevented by adopting a vacuum part 500 for vibration insulation of the outside of the heat insulating part is adopted.

The present invention includes a vacuum unit dividing device 900 so as to divide a plurality of vacuum units 500 in one installation section of a superconducting cable.

As shown in FIG. 3, the vacuum unit partition device 900 of the present invention can be mounted between an external metal tube 600 in which the vacuum unit 500 of the superconducting cable of the present invention is provided, and the length of the superconducting cable It can be divided or divided into a plurality of vacuum units 500 of one superconducting cable that is installed at predetermined intervals in the direction and connects between junction boxes.

Hereinafter, the structure of the superconducting cable vacuum unit partition device 900 according to the present invention will be described in detail.

4 shows a cross-sectional view of one embodiment of a vacuum sectioning device 900 with the core portion of the superconducting cable of the present invention removed, and FIG. 5 shows a cross-sectional perspective view thereof.

The present invention is a core portion (not shown) in which a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer are sequentially provided; In order to cool the core part, it is provided outside the core part to form a cooling part 200 through which a cryogenic refrigerant flows, and an interior of a corrugation structure in which bones and floors made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. Metal tube 300; In order to vacuum insulate the inner metal tube 300, a vacuum part 500 in a vacuum state is formed on the outer side of the inner metal tube 300, and corrugations in which aluminum and stainless steel ribs and floors are repeatedly formed in the longitudinal direction An external metal tube 600 having a gating structure; The outer metal pipe 600 is divided at predetermined intervals, and is mounted between the divided outer metal pipes 600 to divide the vacuum portion 500 inside the outer metal pipe 600 in the longitudinal direction of the superconducting cable. It is possible to provide a superconducting cable comprising a device (900).

The vacuum unit partitioning device 900 provided in the superconducting cable according to the present invention is mounted on the outer surface of the inner metal tube 300 constituting the cooling unit 200, and both external metal tubes divided to divide the vacuum unit 500 ( 600).

In addition, in order to mount the vacuum unit partitioning device 900, the external metal tube 600 is divided at predetermined intervals, and the vacuum unit partitioning device 900 may be mounted between the divided external metal tubes 600. .

Since the vacuum unit dividing device 900 is a device for dividing the vacuum unit 500, airtightness should be ensured in the direction of the dividing and dividing vacuum unit 500 and the inner metal tube 300.

In addition, since the inner metal pipe 300 and the outer metal pipe 600 may be formed of a metal pipe structure in which both valleys and floors are repeated for bending stiffness, etc., the vacuum part partitioning device 900 is connected to the inner metal pipe 300 ) The metal sheet 910 may be mounted on the outer circumferential surface of the inner metal tube 300 in order to flatten the outer circumferential surface of the inner metal tube 300 in order to easily secure airtightness on the outer surface.

The metal sheet 910 may be mounted on the inner metal tube 300 to flatten the outer circumferential surface of the inner metal tube 300, and a heat insulating member 920 may be mounted on the metal sheet 910.

The metal sheet 910 may be mounted by being welded to connect the upper portion of the floor of the inner metal tube 300.

The inner metal tube 300 is provided with a cooling unit 200 through which a cryogenic liquid refrigerant flows, so even if the vacuum unit partitioning device 900 divides the vacuum part 500, the vacuum part partitioning device 900 External heat intrusion through should be minimized.

Therefore, the vacuum unit partition device 900 of the present invention may further include a heat insulating member 920 mounted on the outer surface of the metal sheet 910 attached to the inner metal tube 300.

The heat insulating member 920 may be made of a non-metal material having excellent heat insulating effect.

Fluorine resin may be applied to the heat insulating member 920. As a specific example, PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene) may be mentioned.

PTFE is a chemically inert material, can be applied in cryogenic environments, has a very low coefficient of friction, excellent electrical insulation, and PCTFE has excellent mechanical properties and better gas shielding properties than PTFE. Therefore, a suitable material may be selected and applied according to the shape of the heat insulating member 920 and the like.

A cover member 940 may be mounted on the insulating member 920. The cover member 940 prevents damage to the heat insulating member 920 when the heat insulating member 920 is exposed to the outermost part, and directly attaches a finishing member 950 or a corrugated member 970, which will be described later, directly to the heat insulating member 920. This is an added configuration because it cannot be welded.

The cover member 940 may also be made of a metal material.

In addition, in order to prevent the vacuum from being lost due to a fine gap between the metal sheet 910 and the cover member 940 mounted on the inner and outer surfaces of the heat insulating member 920, the heat insulating member 920 inner surface and the metal At least one sealing member 930 may be provided between the outer surface of the sheet 910 or between the outer surface of the heat insulating member 920 and the inner surface of the cover member 940.

The sealing member 930 is formed in an O-ring shape, seated in a seating groove formed on an inner surface or an outer surface of the thermal insulation member 920, and is airtight between the metal sheet 910 or the cover member 940 and the thermal insulation member 920. Can be guaranteed.

The sealing member 930 may be configured in such a way that the elasticity is maintained so as to compensate for the dimensional shrinkage at cryogenic temperatures. For example, as a method of coating a high-elasticity spring or the like with an insert or a fluororesin on a fluororesin, the surface properties have the general characteristics of the fluororesin, but it is preferable to secure a property that conforms to the spring in mechanical properties according to shrinkage force.

4 and 5, each of the sealing members 930 is shown as being provided in two at positions corresponding to the inner and outer surfaces of the heat insulating member 920, but the number can be increased or decreased as needed. have.

And, the vacuum unit partition device 900 according to the present invention is mounted on the outer surface of the inner metal tube 300 provided with a cooling unit 200 therein, a vacuum unit for vacuum insulating the cooling unit 200 of the superconducting cable ( Since the structure of dividing 500) into a plurality, the external metal tube 600 may be divided into a boundary of the vacuum unit dividing device 900.

That is, each of the divided outer metal tubes 600 is provided with an independent vacuum unit 500 inside by the vacuum unit partition device 900.

Since the vacuum part 500 of the superconducting cable is constructed by evacuating the space formed between the outer surface of the inner metal tube 300 and the inner surface of the outer metal tube 600, the outer metal tube 600 is divided to divide the vacuum part 500 It should be closed in an airtight state by connecting the both ends and the vacuum unit compartment 900 of.

To this end, a finishing member 950 for connecting both ends of the divided external metal tube 600 and the vacuum unit partition device 900 may be provided.

The closing member 950 may be mounted by connecting the outer surface of the cover member 940 constituting the vacuum unit partitioning device 900 and both ends of the divided outer metal tube 600.

4 and 5, the finishing member 950 may be configured as a ring-shaped member having a cross-sectional shape of'a', but its shape may be variously changed.

The closing member 950 is welded and fixed along the circumferential direction to the outer surfaces of the cover member 940 constituting the vacuum section dividing device 900 and both ends of the divided outer metal tube 600, respectively. The vacuum unit 500 may be partitioned.

6 to 11 illustrate a process of mounting the vacuum unit partition device 900 shown in FIGS. 4 and 5.

First, as illustrated in FIG. 6, a position for mounting the vacuum part partition device 900 is determined, and a metal sheet 910 is mounted on the outer surface of the inner metal tube 300 at the determined position.

It is as described above that welding may be used as a method of mounting the metal sheet 910 on the outer surface of the inner metal tube 300 of the corrugation structure.

And, as shown in Figure 7, the metal sheet 910 is mounted on the outer surface of the inner metal tube 300, the sealing member 930 is mounted with a heat insulating member 920.

After mounting the insulating member 920, as shown in FIG. 8, the external metal tube 600 is mounted, and as shown in FIG. 9, the external metal tube 600 is cut into the boundary of the vacuum unit partition device 900. It can be divided in a way.

Of course, rather than the method of cutting the external metal tube 600, a plurality of cut external metal tubes 600 are mounted outside the inner metal tube 300, and then the vacuum unit partitioning device 900 is provided between each of the external metal tubes 600. The method of mounting is also applicable.

Then, as shown in FIG. 10, after the cover member 940 is mounted on the outside of the heat insulating member 920, as shown in FIG. 11, the finishing member 950 is divided into both ends of the outer surface of the cover member 940. Both ends of the external metal tube 600 may be connected to each other by a method such as welding to complete the vacuum unit partition device 900.

In addition, in FIGS. 6 to 11, the cover member 940 constituting the vacuum unit partition device 900 is shown to be mounted after the external metal tube 600 is mounted, but insulates the member during the mounting process of the external metal tube 600. In order to prevent damage to the 920 or the sealing member 930, the cover member 940 is first mounted on the outer surface of the insulating member 920 on which the sealing member 930 is mounted, and then the external metal tube 600 is mounted or It is also possible to perform a dividing process.

The vacuum unit for dividing a plurality of vacuum units 500 for vacuum insulation of one connected cooling unit 200 of a superconducting cable installed between intermediate or terminal junction boxes by the vacuum unit partition device 900 having the above structure The maintenance of 500 can be facilitated.

12 shows a cross-sectional view of another embodiment of the vacuum sectioning device 900 with the core portion of the superconducting cable of the present invention removed. Descriptions duplicated with reference to FIGS. 3 to 11 will be omitted.

In the superconducting cable, the cooling unit 200 forming the cooling channel and the vacuum unit 500 for vacuum insulation are provided inside the inner metal tube 300 and the outer metal tube 600, respectively, and the inner metal tube 300 and the outer metal tube ( 600) has a corrugation structure in which valleys and floors are provided for bending characteristics and the like. Therefore, bending of the superconducting cable is prevented and bending stiffness is also increased.

However, as shown in FIGS. 3 to 11, when the outer metal tube 600 is divided and the vacuum part partitioning device 900 is mounted on the inner metal tube 300, the vacuum part partitioning device 900 is installed in the area. Since the bending characteristics or flexibility of the deterioration may be deteriorated, a wrinkle member 970 may be employed as shown in FIG. 12.

The corrugated member 970 is mounted at the position of the finishing member 950 of the above-described embodiment, and may be composed of a corrugated structure having valleys and floors similar to the structure of the external metal tube 600.

In particular, the gap between the valley and the floor formed on the surface of the corrugated member 970 is smaller than the gap between the rib and the floor of the inner metal tube 300 or the outer metal tube 600, or constitutes the corrugated member 970 The thickness of the metal to be made is smaller than the thickness of the inner metal tube 300 or the outer metal tube 600 to lower the rigidity of the corrugated member 970 itself than the outer metal tube 600 and the inner metal tube 300, thereby making the vacuum part It is possible to partially compensate for deterioration of bending characteristics in the partition device 900 installation area.

The corrugated member 970 may also be made of aluminum or stainless steel or an alloy of the same material as the outer metal tube 600 and the inner metal tube 300.

In addition, the corrugated member 970 may also be bonded to the cover member 940 or the external metal tube 600 by welding such as welding.

13 and 14 illustrate a process of mounting the vacuum unit partition device 900 shown in FIG. 12.

The corrugated member 970 is also the external metal tube divided as in the conventional embodiment after the external metal tube 600 is mounted or divided in the state in which the heat insulating member 920 is mounted, like the finishing member 950 of the above-described embodiment ( Each end of the 600) and both ends of the outer surface of the cover member 940 may be connected and joined, respectively.

In this way, according to the vacuum unit partitioning device according to the present invention and the superconducting cable having the same, the vacuum unit for vacuum insulation of the cooling unit of the superconducting cable can be divided into a plurality of longitudinal sections of the superconducting cable, and For maintenance, it is possible to release the vacuum of the vacuum unit or to reduce the working time and the cost of re-vacuumization of the vacuum unit when the vacuum is destroyed.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can do it. Therefore, if the modified implementation basically includes the components of the claims of the present invention, it should be considered that all are included in the technical scope of the present invention.

1000: superconducting cable
200: cooling unit
300: inner metal tube
500: vacuum unit
600: external metal tube
900: vacuum unit compartment

Claims (28)

A core portion in which a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer are sequentially provided;
In order to cool the core portion, it is provided on the outside of the core portion to form a cooling portion through which a cryogenic refrigerant flows, and an inner metal tube of a corrugated structure in which bones and floors made of aluminum or stainless steel are repeatedly formed in the longitudinal direction;
In order to vacuum-insulate the inner metal tube, an outer metal tube having a corrugated structure in which a vacuum part in a vacuum state is formed outside the inner metal tube, and bones and floors made of aluminum or stainless steel are repeatedly formed in a longitudinal direction; And
The outer metal pipe is divided at predetermined intervals, and is mounted between the divided outer metal pipes, a vacuum unit partitioning device for partitioning the vacuum portion inside the outer metal pipe. According to claim 1,
The vacuum unit partition device is a superconducting cable, characterized in that a plurality of spaced apart in the longitudinal direction of the superconducting cable. According to claim 1,
The vacuum section partition device is a superconducting cable, characterized in that mounted to connect the outer surface of the inner metal tube and the ends of the paired outer metal tube. According to claim 3,
The vacuum unit partition device is a superconducting cable, characterized in that it comprises an insulating member mounted between the inner metal tube outer surface and the ends of the pair of outer metal tubes. According to claim 4,
The vacuum unit partitioning device is mounted to surround the outer surface of the inner metal tube, and includes a metal sheet for flattening the outer surface of the inner metal tube, wherein the heat insulating member is mounted on the metal sheet superconducting cable. The method of claim 5,
A superconducting cable further comprising at least one sealing member mounted in a circumferential direction to seal between the inner surface of the heat insulating member and the outer surface of the metal sheet. The method of claim 6,
The sealing member is composed of an O-ring, superconducting cable, characterized in that seated in the seating groove formed on the inner surface of the heat insulating member. According to claim 4,
The vacuum unit partitioning device further comprises a pair of closing members for closing and connecting a space between a metal cover member mounted on the insulating member and both ends of the cover member and a pair of outer metal pipes, respectively. Superconducting cable, characterized in that provided. The method of claim 8,
The closing member is a superconducting cable, characterized in that the ring member of the'a' cross section shape. The method of claim 8,
A pair of the finishing member is a superconducting cable, characterized in that each welded to the cover member and the pair of the outer metal tube. According to claim 4,
The vacuum unit partitioning device is made of a metal material and is connected to each other by closing and connecting a space between a cover member made of a metal material mounted on an upper portion of the heat insulating member and both ends of the cover member and the ends of the pair of external metal pipes, respectively. Superconducting cable, characterized in that it further comprises a corrugated structure of the corrugated structure repeating the floor. The method of claim 11,
The corrugated member is made of aluminum or stainless steel, and the distance between the ribs and the floor is less than the gap between the ribs and the floor of the inner metal tube or the outer metal tube. The method of claim 11,
The corrugated member is made of aluminum or stainless steel, and the superconducting cable, characterized in that the thickness is smaller than the thickness of the inner metal tube or the outer metal tube. The method of claim 11,
A superconducting cable, characterized in that the pair of corrugated members are welded to the cover member and the pair of external metal tubes, respectively. The method of claim 11,
A superconducting cable further comprising at least one sealing member mounted in a circumferential direction to seal between the outer surface of the heat insulating member and the inner surface of the cover member. The method of claim 11,
The sealing member is composed of an O-ring form, superconducting cable, characterized in that seated in the seating groove formed on the outer surface of the heat insulating member. The method of claim 16,
The vacuum unit partitioning device is a superconducting cable characterized in that the outer metal tube is mounted on the outside of the inner metal tube by dividing the outer metal tube and connecting the inner metal tube with each end of the divided outer metal tube. According to claim 4,
The insulating member is a superconducting cable, characterized in that it is made of PTFE (Poly Tetra Fluoroe Thylene, Teflon) or PCTFE (Poly Chloro Tri Fluoro Ethylene) material. The method of claim 6 or 15,
The sealing member is a superconducting cable, characterized in that the spring is made of a high-elasticity metal material coated with fluororesin with an insert or fluororesin. In the vacuum section partition device for partitioning the vacuum section of the superconducting cable,
A metal sheet mounted on an outer surface of an inner metal tube of a corrugated structure in which a cooling unit through which the refrigerant of the superconducting cable flows is provided therein and the valleys and floors are repeated;
An insulating member mounted outside the metal sheet;
Includes; a cover member mounted to the outside of the heat insulating member,
The outer metal tube of the corrugated structure, which is mounted to form a vacuum on the outside of the inner metal tube and repeats valleys and floors, is divided in the longitudinal direction of the superconducting cable, and each end of the divided outer metal tube and the cover member are connected. , A vacuum unit partitioning device characterized in that the vacuum units inside each external metal tube are partitioned. The method of claim 20,
The vacuum unit partitioning device further comprises a pair of finishing members connecting both ends of the cover member and each end of the pair of external metal tubes. The method of claim 21,
The closing member is a vacuum unit partitioning device, characterized in that the ring member having a'a' cross section. The method of claim 20,
The vacuum unit partitioning device is characterized in that it further comprises a pair of corrugated members having a corrugated structure that connects both ends of the cover member and each end of the pair of external metal tubes, and the valleys and floors are repeated. Vacuum unit compartment. The method of claim 23,
The corrugated member is made of aluminum or stainless steel, and the gap between the ribs and the floor of the corrugated member is smaller than the gap between the ribs and the floor of the inner metal tube or the outer metal tube. The method of claim 23,
The corrugated member is made of aluminum or stainless steel, and the thickness of the corrugated member is smaller than the thickness of the inner metal tube or the outer metal tube. The method of claim 20,
The insulating member is PTFE (Poly Tetra Fluoroe Thylene, Teflon) or PCTFE (Poly Chloro Tri Fluoro Ethylene) material, characterized in that the vacuum unit partition device. The method of claim 20,
At least one sealing member is provided in a circumferential direction between the outer surface of the metal sheet and the inner surface of the heat insulating member or between the outer surface of the heat insulating member and the inner surface of the heat insulating member, and the sealing member is made of a high elastic metal spring made of fluorine resin. Vacuum unit partition device characterized in that it is configured by coating with an insert or fluorine resin. The method of claim 27,
The sealing member is formed in an O-ring shape, the vacuum unit partition device, characterized in that seated in the seating groove formed on the outer or inner surface of the heat insulating member.

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