KR102619343B1 - Vacuum Insulation Part Dividing Device And Superconducting Cable Having The Same - Google Patents

Abstract

The present invention divides the vacuum section for vacuum insulating the cooling section of the superconducting cable into a plurality of vacuum sections in the longitudinal direction of the superconducting cable, evacuates the section area itself to minimize heat intrusion and heat transfer through the section area, and evacuates the vacuum section of the superconducting cable. When the vacuum is released or destroyed, the work time and resulting costs required to re-vacuum the vacuum section can be greatly reduced, and the main function of the superconducting cable can be quickly implemented. A vacuum section partition device and a superconducting cable equipped with the same It's about.

Description

Vacuum division device and superconducting cable having the same {Vacuum Insulation Part Dividing Device And Superconducting Cable Having The Same}

The present invention relates to a vacuum partition device and a superconducting cable including the same. More specifically, the present invention divides the vacuum section for vacuum insulating the cooling section of the superconducting cable into a plurality of sections in the longitudinal direction of the superconducting cable, and vacuumizes the section area itself to minimize heat intrusion and heat transfer through the section area, thereby forming a superconducting cable. When the vacuum part of the vacuum part of the cable is released or destroyed, the work time and the resulting cost required to re-vacuum the vacuum part can be greatly reduced, and the vacuum part partition device and the same are used to quickly implement the main function of the superconducting cable. It relates to a superconducting cable provided.

Cryogenic cooling technology is widely used and researched in a variety of fields, including power transmission technology using superconductors, medical technology, basic nuclear fusion technology, and satellite-related technology.

A widely used cryogenic cooling method is a method in which a cooling unit is provided for cooling using a refrigerant such as liquid nitrogen circulating on the outside of a cooling container containing the object to be cooled, and a vacuum unit for vacuum insulation is provided on the outside of the cooling unit. You can.

Superconducting power systems have the advantage of being able to transmit large amounts of current even at relatively low voltages by using the characteristic that the resistance of superconductors converges to zero at extremely low temperatures.

In order to create superconducting conditions for the superconductors that make up the superconducting cable, a cryogenic environment in the core containing the superconductors must be guaranteed.

Therefore, in order to form a cryogenic temperature, which is the superconductivity condition of a superconductor, the superconducting cable flows cryogenic liquid refrigerant through a cooling part in the form of a cooling channel on the outside of the core part, and further forms a vacuum part on the outside of the cooling channel to vacuum insulate the cooling part. By preventing heat intrusion from the outside, the extremely low temperature state of the core part equipped with the superconducting conductor can be stably maintained.

A method of forming a vacuum inside a superconducting cable secures a separation space capable of forming a vacuum, and provides a plurality of spacers inside the space to physically prevent the inner and outer surfaces of the separation space from contacting each other, A method of vacuuming the separation space may be used.

The operation of vacuuming the vacuum part can be performed by pumping the empty space inside the external metal tube of the superconducting cable using a pump or the like.

In addition, a sensor for measuring the temperature of the cooling part may be mounted on the surface of the inner metal tube, etc., and for the failure or maintenance of the sensor, the vacuum in the vacuum part is artificially released or the external metal tube is damaged and the vacuum state in the vacuum part is destroyed. In this case, a vacuum must be created again in the vacuum area, but the vacuuming process to restart the superconducting power system can take 1 to 2 weeks in proportion to the unit installation length bordering the junction box, so it is a major weakness as a power system. do.

The present invention divides the vacuum section for vacuum insulating the cooling section of the superconducting cable into a plurality of vacuum sections in the longitudinal direction of the superconducting cable, evacuates the section area itself to minimize heat intrusion and heat transfer through the section area, and evacuates the vacuum section of the superconducting cable. When the vacuum is released or destroyed, the work time and resulting costs required to re-vacuum the vacuum section can be greatly reduced, and the main function of the superconducting cable can be quickly implemented. A vacuum section partition device and a superconducting cable equipped with the same The problem to be solved is to provide .

In order to solve the above problem, the present invention includes a core portion sequentially provided with a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer; In order to cool the core part, an inner metal tube is provided outside the core part to form a cooling part through which a cryogenic refrigerant flows, and has a corrugation structure in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction; In order to vacuum insulate the inner metal tube, a vacuum portion is formed outside the inner metal tube, and an outer metal tube of a corrugation structure is formed in which grooves and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction; And the external metal tube is divided at predetermined intervals, and is mounted between the divided external metal tubes to define a vacuum part inside the external metal tube, and is provided with a chamber member to form its own vacuum part to prevent external heat intrusion. A superconducting cable including a vacuum partition device that can be provided can be provided.

Additionally, a plurality of vacuum partition devices may be installed to be spaced apart in the longitudinal direction of the superconducting cable.

In this case, the vacuum partition device may be installed to connect the outer surface of the inner metal tube and the split ends of the pair of external metal tubes.

Additionally, the vacuum partition device may include a heat insulating member mounted between the outer surface of the inner metal tube and the ends of the pair of outer metal tubes.

Additionally, the vacuum partition device may include a metal sheet that is mounted to surround the outer surface of the inner metal tube and flatten the outer surface of the inner metal tube, and the heat insulating member may be mounted on the upper part of the metal sheet.

Here, it may further include at least one sealing member mounted in the circumferential direction to seal between the inner surface of the insulation member and the outer surface of the metal sheet.

Additionally, the sealing member is configured in the form of an O-ring and may be seated in a seating groove formed on the inner surface of the insulation member.

In this case, the vacuum partition device includes a cover member made of metal mounted on the upper part of the insulation member and a pair of finishes that respectively close and connect the space between both ends of the cover member and the ends of the pair of external metal pipes. Additional members may be provided.

Additionally, the finishing member may be a ring member with an 'L' cross-sectional shape.

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

Here, the vacuum partition device is made of a metal cover member mounted on the top of the insulating member and connects the space between both ends of the cover member and the ends of the pair of external metal pipes, respectively, and is made of a metal material. A corrugated member having a corrugation structure in which valleys and ridges are repeated may be further provided.

In addition, the corrugated member may be made of aluminum or stainless steel, and the distance between the valleys and the ridges may be smaller than the distance between the valleys and the ridges of the inner metal pipe or the outer metal pipe.

In this case, the corrugated member may be made of aluminum or stainless steel and may have a thickness smaller than the thickness of the inner metal tube or the outer metal tube.

Additionally, the pair of corrugated members may be respectively welded to the cover member and the pair of external metal tubes.

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

Here, the sealing member is configured in the form of an O-ring and can be seated in a seating groove formed on the outer surface of the insulation member.

Additionally, the vacuum partition device may be constructed by dividing the external metal tube with the external metal tube mounted on the outside of the internal metal tube and connecting each end of the divided external metal tube with the internal metal tube.

Additionally, the insulation member may be made of PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene) material.

Here, the sealing member is configured in the form of an O-ring and may be seated in a seating groove formed on the outer or inner surface of the insulation member.

Additionally, the chamber member may be joined to the outer surface of an external metal pipe surrounding the finishing member or the corrugated member.

In this case, a pair of external metal tubes divided by the vacuum partition device and a vacuum port may be provided in each of the chamber members to evacuate the vacuum formed inside the chamber member.

Additionally, at least one vacuum hole may be formed in the external metal tube, the finishing member, or the corrugated member to communicate with the vacuum part inside the external metal tube within the chamber member.

Additionally, the vacuum hole may be circular or track-shaped.

Here, when a plurality of vacuum holes are provided, the vacuum holes may be formed within the finishing member to be spaced apart in the circumferential direction of the external metal pipe, the finishing member, or the corrugated member.

Additionally, no more than two vacuums may be applied to a pair of external metal tubes partitioned by the chamber member and the vacuum partition device.

In addition, in order to solve the above problem, the present invention provides a vacuum partition device for partitioning the vacuum part of a superconducting cable, wherein a cooling part through which the refrigerant of the superconducting cable flows is provided inside and corrugation in which valleys and ridges are repeated. A metal sheet mounted on the outer surface of the internal metal tube of the structure; An insulation member made of PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene) mounted on the outside of the metal sheet; a cover member mounted on the outside of the insulation member; The outer metal tube, which is mounted to form a vacuum on the outside of the inner metal tube and has a corrugated structure with repeated valleys and ridges, is divided in the longitudinal direction of the superconducting cable, and connects each end of the divided outer metal tube with the cover member. A pair of finishing members; And, it is possible to provide a vacuum section dividing device for a superconducting cable including a chamber member that forms an empty space for forming a vacuum section around the cover member and the finishing member and connects the outer surfaces of a pair of external metal tubes.

Here, at least one sealing member in which a spring made of highly elastic metal is inserted into fluororesin or coated with fluororesin may be provided on the inner or outer surface of the insulating member.

Additionally, at least one vacuum hole may be formed in the external metal tube, the finishing member, or the corrugated member to communicate with the vacuum part inside the external metal tube within the chamber member.

In addition, in order to solve the above problem, the present invention provides a vacuum partition device for partitioning the vacuum part of a superconducting cable, wherein a cooling part through which the refrigerant of the superconducting cable flows is provided inside and corrugation in which valleys and ridges are repeated. A metal sheet mounted on the outer surface of the internal metal tube of the structure; An insulation member made of PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene) mounted on the outside of the metal sheet; a cover member mounted on the outside of the insulation member; And, the outer metal tube, which is mounted to form a vacuum outside the inner metal tube and has a corrugation structure with repeated valleys and ridges, is divided in the longitudinal direction of the superconducting cable, and each end of the divided outer metal tube and the cover member are separated. A corrugated member with a corrugation structure in which a pair of valleys and ridges connecting both ends are repeated; And, it is possible to provide a vacuum section dividing device for a superconducting cable including a chamber member that forms an empty space for forming a vacuum section around the cover member and the finishing member and connects the outer surfaces of a pair of external metal tubes.

Additionally, at least one sealing member may be provided on the inner or outer surface of the insulating member, in which a spring made of highly elastic metal is inserted into fluorine resin or coated with fluorine resin.

In this case, at least one vacuum hole may be formed in the external metal tube, the finishing member, or the corrugated member to communicate with the vacuum part inside the external metal tube within the chamber member.

According to the vacuum section dividing device and the superconducting cable including the same according to the present invention, the vacuum section for vacuum insulating the cooling section of the superconducting cable can be divided into a plurality of vacuum sections in the longitudinal direction of the superconducting cable.

Therefore, according to the vacuum section dividing device and the superconducting cable including the same according to the present invention, the work time for releasing the vacuum in the vacuum section for maintenance of the superconducting cable or re-vacuuming the vacuum section when the vacuum is broken, and the resulting Costs can be greatly reduced.

In addition, according to the vacuum partition device and the superconducting cable including the same according to the present invention, the vacuum partition device itself is provided with a chamber member for forming a vacuum region, thereby minimizing heat intrusion from the outside through the vacuum partition device. there is.

In addition, according to the vacuum partition device and the superconducting cable including the same according to the present invention, the structure can be further simplified by sharing a vacuum port by forming a vacuum hole in the external metal tube or vacuum partition device within the chamber member.

Figure 1 shows a perspective view of the end of the superconducting cable of the present invention with multiple stages removed, and Figure 2 shows a cross-sectional view of the superconducting cable shown in Figure 1.
Figure 3 shows an external perspective view of one embodiment of the vacuum section partition device installed in the superconducting cable of the present invention.
Figure 4 shows a cross-sectional view of one embodiment of the vacuum partition device in the state in which the core portion of the superconducting cable of the present invention is removed.
Figure 5 shows a cross-sectional view of another embodiment of the vacuum partition device in the state in which the core portion of the superconducting cable of the present invention is removed.
Figures 6 and 7 show an external perspective view of another embodiment of the vacuum partition device installed in the superconducting cable of the present invention.
Figures 8 and 9 show a cross-sectional view of one embodiment of the vacuum partition device in the state in which the core portion of the superconducting cable of the present invention is removed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached 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 disclosure will be thorough and complete, and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

Figure 1 shows a perspective view of the end of the superconducting cable of the present invention with multiple stages removed, and Figure 2 shows a cross-sectional view of the superconducting cable shown in Figure 1.

The superconducting cable 1000 includes a former 110 from the inside to the outside, and a plurality of superconductors arranged side by side in the longitudinal direction of the former 110 to surround the outside of the former 110. It includes 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 to surround the outside of the insulating layer 140. A core portion 100 including at least two layers of superconducting shielding layer 180, and a core portion 100 provided on the outside of the core portion 100 to cool the core portion 100. A cooling unit 200 having a refrigerant flow path for liquid refrigerant for cooling, an internal metal tube 300 provided on the outside of the cooling unit 200, and an internal metal tube 300 provided on the outside, the insulation material 401 is provided in various ways. An insulating part 400 forming a layer-wrapped insulating layer, a vacuum part provided with a plurality of spacers 560 at spaced apart positions outside the insulating part 400 to vacuum insulate the cooling part 200 ( 500), an external metal pipe 600 provided outside the vacuum unit 500, and a cable jacket 700 provided outside the external metal pipe 600.

Each component that makes up a superconducting cable will be reviewed sequentially as follows. The former 110 provides a place to mount a flat and long superconductor around the former 110, serves as a frame for forming a shape, and can become a path through which a fault current flows. The former 110 may have a shape in which a plurality of copper (Cu) wires 111 having a circular cross-section are compressed into a circular shape.

Since several strands of copper (Cu) wires 111 with circular cross sections constituting the former 110 are compressed into a circular shape to form a stranded wire, its surface is bound to be convex. Accordingly, in order to smooth the convex surface of the former 110, a smoothing layer 120 may be coated on the outside of the former 110. The smooth layer 120 may be made of a material such as semiconducting carbon paper or brass tape.

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

The embodiment shown in FIGS. 1 and 2 is shown to be provided with a total of two superconducting conductor layers 130a and 130b. Additionally, if the superconducting conductor layers are simply stacked, the current capacity does not increase due to the skin effect of the current. To prevent this problem, when the superconducting conductor layer is provided in multiple layers, 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 stacked superconducting conductor layers 130a and 130b to insulate the superconducting conductor layers 130a and 130b from each other to prevent the skin effect of the stacked superconductors. can do.

In the embodiment shown in FIGS. 1 and 2, the superconducting conductor layer 130 is shown as an example composed of two layers, a first superconducting conductor layer 130a and a second superconducting conductor layer 130b, but may be added as needed. A layer of superconducting conductor may also be provided.

In addition, the superconductors constituting each superconducting conductor layer 130a and 130b may be connected in parallel with each wire constituting the former 110. This is to ensure that the current flowing through the superconductor flows into the wire of the former 110 in the event of an accident such as destruction of the superconducting condition. If the superconductivity conditions are not satisfied in this way, the resistance of the superconductor increases and the resulting heat generation or damage to the superconductor is prevented.

An internal semiconducting layer 150 may be provided outside the second superconducting conductor layer 130b provided outside the first superconducting conductor layer 130a. The internal semiconducting layer 150 may be provided to alleviate electric field concentration in each region of the superconducting conductor layer 130 and even out the surface electric field. The internal semiconducting layer 150 may be provided by winding a semiconducting tape.

An insulating layer 160 may be provided outside the internal semiconducting layer 150. The insulating layer 160 may be provided to increase the dielectric strength of the superconducting cable. Generally, XLPE (Cross Linking-Polyethylene) or oil filled cables are used to insulate high-voltage cables. However, superconducting cables are cooled to extremely low temperatures for superconductivity, and at extremely low temperatures, XLPE is damaged and the insulation is destroyed. Since oil-filled cables may cause environmental problems, the superconducting cable according to the present invention can use insulating paper made of general paper as the insulating layer 160, and the insulating layer 160 It can 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 alleviate the concentration of electric fields in each region of the superconducting conductor layer 130 and 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. .

Additionally, a superconducting shielding layer 180 may be provided outside the external 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. If the surface of the external semiconducting layer 170 is uneven, a smoothing layer (not shown) may be provided as needed, and the superconductors to form the superconducting shielding layer 180 outside the smoothing layer are placed in the circumferential direction. They can be placed side by side.

A core exterior layer 190 that serves as the exterior of the core portion 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 is exposed to a cooling layer to be described later.

In this way, the core portion 100 of the superconducting cable can be constructed. In FIGS. 1 and 2, the smooth layer and the semiconducting layer are shown as being composed of a single layer of the same material, but various auxiliary layers can be used as necessary. may be added.

A cooling unit 200 may be provided outside the core unit 100. The cooling unit 200 may be provided to cool the superconductor of the core unit 100, and the cooling unit 200 may be provided with a circulation path for liquid refrigerant inside the cooling unit 200. Liquid nitrogen may be used as the liquid refrigerant, and the liquid refrigerant (liquid nitrogen) circulates through the coolant passage in a cooled state to have a temperature of about -200 degrees, and the superconductor provided in the core part inside the cooling unit It is possible to maintain extremely low temperatures, which are conditions for superconductivity.

The cooling passage provided in the cooling unit 200 can allow liquid refrigerant to flow in one direction, and can be recovered from a connection box of a superconducting cable, etc., re-cooled, and supplied again to the cooling passage of the cooling unit 200.

An internal metal tube 300 may be provided outside the cooling unit 200. The inner metal pipe 300, together with the outer metal pipe 600, which will be described later, serves as the exterior of the superconducting cable to prevent mechanical damage to the core portion 100 during installation and operation of the superconducting cable. Superconducting cables are wound around a drum for easy manufacturing and transportation. When installing, the cable wound around the drum is deployed and installed, so bending or tensile stress can be continuously applied to the superconducting cable.

In order to maintain initial performance even in situations 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 rises and depressions are repeated in the longitudinal direction of the superconducting cable to reinforce rigidity against mechanical stress, and the inner metal tube 300 is made of a material such as aluminum. It can be.

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

Additionally, an insulating portion 400 may be provided on the outer peripheral surface of the inner metal tube 300, including an insulating layer in which several layers of insulating material are thinly coated with a polymer having low thermal conductivity and a highly reflective metal film. The insulation layer constitutes multi-layer insulation (MLI, Multi Layer Insulation) and can minimize heat transfer mainly by radiation.

Therefore, the effect of preventing heat exchange or heat intrusion due to radiation can be obtained due to the metal film material with high reflectivity.

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

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

The vacuum unit 500 is a separation space provided to prevent heat intrusion from the outside, which is at room temperature, into the core unit due to convection, etc., and may be provided with at least one spacer 560 to form a physical separation space. The separation space within the vacuum unit 500 is used to prevent the entire area of the superconducting cable from coming into contact with the external metal pipe 600 provided outside the vacuum unit 500 and the insulation unit 400 inside the vacuum unit 500. At least two spacers 560 may be provided within. The spacer 560 may be arranged along the longitudinal direction of the superconducting cable, and may be wound to spirally surround the outside of the core portion 100, specifically, the insulation portion 400.

As shown in FIG. 1, a plurality of spacers 560 may be provided, and the number of spacers 560 may increase or decrease depending on the type or size of the 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 unit 500 where the spacer 560 is provided. The external metal tube 600 may be made of the same shape and material as the internal metal tube 300, and the external metal tube 600 may be made of a larger diameter than the internal metal tube 300, so that it can be formed through the spacer 560. It may be possible to form a separation space.

The vacuum part 500 of the conventionally introduced superconducting cable is configured to minimize heat intrusion due to convection by vacuuming the inside, and the vacuum part 500 is a partition in the laying section of the superconducting cable connecting the intermediate or terminal junction boxes. It was not made up, but was composed as one.

Therefore, if the external metal pipe 600 dividing 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 The vacuum state of the vacuum part 500 is released together.

Therefore, after the damaged part or internal maintenance of the superconducting cable is completed, the vacuum part 500 is vacuumized again by a method such as suction for a long period of time in order to vacuum the vacuum part 500 to about 10 ^-5 Torr. The vacuuming work of the study 500 is often performed for more than a week in proportion to the length of the laying section.

In order to solve this problem, the present invention provides a vacuum partition device for partitioning or dividing the vacuum part of one superconducting cable into a plurality of parts, so that vacuum release of the vacuum part can be performed in each section. The explanation for this will be postponed later.

A cable jacket 700 that performs an external function to protect the inside of the superconducting cable may be provided outside the external metal tube 600. The cable jacket 700 may be made of a sheath material constituting a typical power cable jacket 700.

Figure 3 shows an external perspective view of one embodiment of the vacuum section partition device installed in the superconducting cable of the present invention.

As described above, in order to maintain the cryogenic environment inside the core part, the superconducting cable flows a cryogenic liquid refrigerant inside the inner metal tube 300 and has an insulation part 400 composed of wrapping insulation around the outside of the inner metal tube 300. A structure is adopted to prevent external heat intrusion by providing a vacuum part 500 to insulate the outside of the insulating part from vibration.

The present invention is provided with a vacuum section dividing device 900 so that the vacuum section 500 can be divided into a plurality in one installation section of a superconducting cable.

As shown in FIG. 3, the vacuum section partition device 900 of the present invention can be mounted between the external metal tube 600 in which the vacuum section 500 of the superconducting cable of the present invention is provided, and the length of the superconducting cable The vacuum portion 500 of one superconducting cable that is installed at predetermined intervals in the direction and connects the connection boxes may be divided or partitioned into a plurality of pieces.

In addition, this vacuum partition device 900 is installed between the external metal pipes 600 to solve the inconvenience that may occur when the vacuum part is connected for a long time, but heat intrusion through the vacuum partition device 900 is prevented. If this occurs, it can have major side effects such as impairing the stability of the superconducting power system and increasing the cooling load.

Accordingly, the vacuum partition device 900 of the present invention uses a method of dividing the vacuum part into a plurality of parts and simultaneously forming a separate vacuum part to prevent heat intrusion into the area where the vacuum partition device is mounted.

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

Figure 4 shows a cross-sectional view of one embodiment of the vacuum partition device 900 in a state in which the core portion of the superconducting cable of the present invention is removed.

The present invention includes 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 on the outside of the core part to form a cooling part 200 through which cryogenic refrigerant flows, and the interior of the corrugation structure in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. Metal pipe (300); In order to vacuum insulate the inner metal tube 300, a vacuum portion 500 in a vacuum state is formed outside the inner metal tube 300, and a core in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. An external metal pipe (600) with a corrugation structure; The external metal tube 600 is divided at predetermined intervals and is mounted between the divided external metal tubes 600 to partition the vacuum part 500 inside the external metal tube 600 and to create its own vacuum part (V). A superconducting cable including a vacuum partition device 900 capable of preventing external heat intrusion by providing a chamber member 960 for forming a superconducting cable can be provided.

The vacuum partition 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 part 200, and is divided into two outer metal tubes ( 600).

In order to install the vacuum partition device 900, the external metal tube 600 is divided at predetermined intervals, and the vacuum partition device 900 can be installed between the divided external metal tubes 600. .

Here, the external metal tube 600 is cut, or a plurality of cut external metal tubes 600 are mounted on the outside of the internal metal tube 300, and then a vacuum partition device 900 is installed between each external metal tube 600. Mounting method is also applicable.

Since the vacuum section dividing device 900 is a device for dividing the vacuum section 500, airtightness must be guaranteed in the direction of the divided vacuum section 500 and the internal metal pipe 300.

In addition, since both the inner metal tube 300 and the outer metal tube 600 can be composed of a metal tube structure with repeated valleys and ridges for bending rigidity, etc., the vacuum partition device 900 is connected to the inner metal tube 300. ) A metal sheet 910 may be mounted on the outer circumferential surface of the internal metal tube 300 in order to be mounted on the outer surface.

Welding or the like may be used as a method of mounting the metal sheet 910 on the outer surface of the internal metal pipe 300 of the corrugation structure.

The metal sheet 910 may be mounted on the inner metal tube 300 to flatten the outer peripheral surface of the inner metal tube 300, and the insulation member 920 may be mounted on the metal sheet 910.

The metal sheet 910 may be welded and installed to connect the top of the ridge of the internal metal pipe 300.

Since the internal metal pipe 300 is provided with a cooling part 200 in which cryogenic liquid refrigerant flows, even if the vacuum partition device 900 partitions the vacuum part 500, the vacuum partition device 900 External heat intrusion must be minimized.

Accordingly, the vacuum partition device 900 of the present invention may further include an insulating member 920 mounted on the outer surface of the metal sheet 910 attached to the inner metal pipe 300.

The insulation member 920 may be made of a non-metallic material with excellent thermal insulation effect.

The insulation member 920 may be made of fluorocarbon resin. Specific examples include PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene).

PTFE is a chemically inert material and can be applied even in cryogenic environments, has a very low coefficient of friction, and has excellent electrical insulation properties. PCTFE has excellent mechanical properties and superior gas shielding properties compared to PTFE. Therefore, an appropriate material can be selected and applied depending on the shape of the insulation member 920.

A cover member 940 may be mounted on the insulation member 920.

The cover member 940 prevents damage to the insulating member 920 when the insulating member 920 is exposed to the outermost part and allows the finishing member 950 or corrugated member 970, which will be described later, to be directly connected to the insulating member 920. It is an additional component because it cannot be welded.

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

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

The sealing member 930 is configured in the form of an O-ring and is seated in a seating groove formed on the inner or outer surface of the insulating member 920 to maintain airtightness between the metal sheet 910 or the cover member 940 and the insulating member 920. can be guaranteed.

In this case, an insulating member 920 equipped with a sealing member 930 can be mounted on the outer surface of the inner metal tube 300 on which the metal sheet 910 is mounted.

The sealing member 930 may be configured to maintain continuous elasticity to compensate for dimensional shrinkage at extremely low temperatures. For example, by inserting a highly elastic metal spring, etc. into fluororesin or coating it with fluororesin, it is desirable to ensure that the surface properties have the general characteristics of fluororesin, but that mechanical properties such as contraction force are similar to those of a spring. .

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

In addition, the vacuum partition device 900 according to the present invention is mounted on the outer surface of the inner metal tube 300 provided with the cooling part 200 therein, and includes a vacuum part for vacuum insulating the cooling part 200 of the superconducting cable. Since the structure divides 500 into a plurality of parts, the external metal pipe 600 can be divided with the vacuum partition device 900 as a boundary.

That is, each of the divided external metal pipes 600 is provided with an independent vacuum section 500 on the inside by the vacuum section dividing device 900.

The vacuum portion 500 of the superconducting cable is constructed by vacuuming the space formed between the outer surface of the inner metal tube 300 and the inner surface of the outer metal tube 600. Therefore, in order to partition the vacuum portion 500, the divided outer metal tube 600 is used. Both ends of the vacuum section 900 must be connected to be closed in an airtight state.

For this purpose, a finishing member 950 may be provided to connect both ends of the divided external metal pipe 600 and the vacuum partition device 900.

The finishing member 950 may be mounted by connecting the outer surface of the cover member 940 constituting the vacuum partition device 900 with both ends of the divided external metal pipe 600.

As shown in FIGS. 4 and 5, the finishing member 950 may be composed of a ring-shaped member with an 'ㄱ' cross-sectional shape, but its shape may be changed in various ways.

The finishing member 950 is fixed by welding along the circumferential direction to the outer surface of the cover member 940 constituting the vacuum partition device 900 and both ends of the divided external metal tube 600. The vacuum section 500 can be divided.

By connecting and finishing the external metal tube 600 and the cover member 940 with the finishing member 950, each vacuum section can be divided and vacuumized.

However, since the cover member 940, the insulating member 920, and the metal sheet 910 are arranged in the radial direction in the area where the vacuum section is divided, that is, the center of the vacuum section dividing device 900, the insulating member 920 has an insulating function. However, heat intrusion may occur due to heat conduction.

Accordingly, in the present invention, the vacuum portion partition device 900 may further include a chamber member 960 for forming its own vacuum portion.

The chamber member 960 may be joined to the outer surface of the external metal tube 600 surrounding the pair of finishing members 950.

Therefore, even if the heat penetrating from the outside of the vacuum partition device 900 is conducted to the inside of the chamber member 960, convection is blocked by the internal vacuum part (V), so the cover member 940 and the insulation member 920 ) and heat intrusion via the metal sheet 910 can be minimized. That is, the heat penetrating from the outside of the vacuum partition device 900 is conducted along the surface of the chamber member 960 to the external metal tube 600 equipped with the vacuum part 500 inside, and only a portion of the heat is conducted. Since it is conducted through the cover member 940, etc., the amount of heat entering the vacuum section 900 that is transmitted to the cooling section can be ignored.

Therefore, in order to sufficiently increase the heat transfer path of heat conducted through the chamber member 960 and the external metal pipe 600 and penetrated into the core portion, the chamber member 960 has a sufficient width and is joined to the external metal pipe 600. It is desirable.

After the chamber member 960 to form its own vacuum part (V) is mounted inside, a vacuum port 980 for suction to form its own vacuum part (V) by vacuuming the internal space is provided. It may be provided in the chamber member 960.

In addition, since the external metal pipe 600 is divided by the vacuum section dividing device 900, the vacuum port 680 for vacuuming each vacuum section inside the divided external metal pipes 600a and 600b is divided into each division. It can be provided in the external metal pipes 600a and 600b.

The vacuum section 500 for vacuum insulating one connected cooling section 200 of the superconducting cable installed between the middle or end junction boxes is divided into a plurality of vacuum sections by the vacuum section partition device 900 of this structure. Maintenance of (500) can be facilitated, and heat intrusion through the vacuum partition device (900) can also be minimized to improve the stability of the system.

Figure 5 shows a cross-sectional view of another embodiment of the vacuum partition device 900 in a state in which the core portion of the superconducting cable of the present invention is removed. Descriptions that overlap with those referring to FIGS. 3 and 4 will be omitted.

In the superconducting cable, a cooling part 200 forming a cooling passage and a vacuum part 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 provided with valleys and ridges for bending characteristics, etc.

Therefore, bending during bending of the superconducting cable is prevented and bending rigidity is increased.

However, as shown in FIG. 4, when the external metal tube 600 is divided and the vacuum partition device 900 is mounted on the outer surface of the inner metal tube 300, the bending characteristics in the installation area of the vacuum partition device 900 Alternatively, since flexibility may deteriorate, a pleated member 970 may be employed as shown in FIG. 5 to compensate for this.

The corrugated member 970 is mounted at the position of the finishing member 950 in the above-described embodiment, and may be configured as a corrugation structure having valleys and ridges similar to the structure of the external metal pipe 600.

In particular, the interval between the valleys and ridges formed on the surface of the corrugated member 970 is smaller than the interval between the corrugations and ridges of the inner metal tube 300 or the outer metal tube 600, or constitutes the corrugated member 970. The thickness of the metal is configured to be smaller than the thickness of the inner metal tube 300 or the outer metal tube 600, so that the rigidity of the corrugated member 970 itself is lowered than that of the outer metal tube 600 and the inner metal tube 300 to form a vacuum section. It is possible to partially compensate for the deterioration of bending characteristics in the installation area of the partition device 900.

Like the outer metal tube 600 and the inner metal tube 300, the corrugated member 970 may also be made of aluminum, stainless steel, or an alloy thereof.

In addition, the corrugated member 970 can also be joined to the cover member 940 or the external metal pipe 600 by welding or other methods to ensure airtightness.

Like the finishing member 950 of the above-described embodiment, the corrugated member 970 is also divided into external metal pipes ( Each end of 600) and both ends of the outer surface of the cover member 940 can be connected and joined.

Then, the chamber member 960 equipped with the vacuum port 980 is mounted on the surfaces of both external metal pipes 600 to complete the vacuum partition device 900, and the vacuum section 900 is self-sealed through vacuum suction through the vacuum port 980. The fact that external heat intrusion can be prevented by forming a vacuum portion (V) within the in-chamber member 960 is the same as in the above-described embodiment.

Figures 6 and 7 show an external perspective view of another embodiment of the vacuum partition device installed in the superconducting cable of the present invention.

3 to 5, a vacuum port 980 for forming a vacuum portion V inside the chamber member 960 is provided in the chamber member 960, and divided external metal tubes 600a and 600b are provided. A vacuum port 680 for vacuumizing each of the inner vacuum portions was provided in each of the divided external metal tubes 600a and 600b.

However, the embodiment shown in FIGS. 6 and 7 uses a vacuum to evacuate the vacuum section 500 inside the chamber member 960 and inside the external metal pipes 600a and 600b divided by the vacuum section partition device 900. It can have a structure where ports are shared.

That is, in the embodiment shown in FIG. 6, unlike the above-described embodiment, the vacuum ports provided in each of the divided external metal pipes 600a and 600b are omitted, and in the embodiment shown in FIG. 7, the vacuum partition device 900 is used. The vacuum port provided in the chamber member 960 constituting may be omitted.

In addition, the embodiment shown in FIG. 7 is shown as having a vacuum port 680 in each of the divided external metal pipes 600a and 600b, but only one external metal pipe among the divided external metal pipes 600a and 600b is provided. Only the vacuum port is provided so that the entire vacuum part 500 inside the divided external metal tubes 600a and 600b and the vacuum part V inside the chamber member 960 can be vacuumized. This will be described with reference to FIGS. 8 and 9.

FIG. 8 shows a cross-sectional view of one embodiment of the vacuum partition device in a state in which the core portion of the superconducting cable of the present invention is removed. Descriptions that overlap with those with reference to FIGS. 4 and 5 will be omitted.

Here, in the embodiment shown in FIG. 8, the vacuum port 980 is provided only in the chamber member 960 constituting the vacuum partition device 900, and in the embodiment shown in FIG. 9, the divided external metal tube 600a, Although each vacuum port 680 is shown in 600b), as described above, the location or number of each vacuum port may be changed.

That is, the embodiment shown in FIGS. 4 and 5 is shown as having three vacuum ports in a vacuum partition device and a pair of divided external metal tubes, but the embodiment shown in FIG. 8 is shown as having two vacuum ports. A port may be provided.

In order for the negative pressure through the vacuum port to be applied to both the vacuum part 500 inside the divided external metal tubes 600a and 600b and the vacuum part V inside the chamber member 960, the vacuum part inside the chamber member 960 A structure is required so that (V) and the vacuum portion 500 inside the divided external metal pipes 600a and 600b communicate with each other.

Therefore, the embodiment shown in FIG. 8 includes each of the external metal tubes 600a and 600b and a finishing member 950 for closing and connecting the external metal tubes 600a and 600b to the vacuum partition device 900, respectively. An example in which vacuum holes 608 and 958 are provided so that vacuum sound pressure can be transmitted is shown.

At least one vacuum hole may be formed in the external metal pipes 600a and 600b or the finishing member 950 by a method such as drilling or punching.

In addition, in the case where a plurality of vacuum holes 608, 958 are formed in the external metal tubes 600a, 600b or the finishing member 950, the external metal tubes 600a, 600b or the finishing member 950 are provided. It may be provided to be spaced apart along the circumferential direction.

The shape of the vacuum holes (608, 958) is preferably circular or track-shaped, in which stress is not concentrated, and its size depends on the rigidity of the external metal tubes (600a, 600b) or the finishing member (950). It can be of a size that does not affect it.

In addition, when the shape of the vacuum holes 608 and 958 is not circular but track-shaped, it is advantageous to configure the vacuum holes 608 and 958 to be formed in the longitudinal direction of the cable.

Additionally, as described above, the shape of the finishing member 950 can be changed in various ways, and the position of the vacuum hole 958 formed in the finishing member 950 can also be changed.

Specifically, as shown in FIG. 8, the vacuum hole 958 formed in the finishing member 950 is formed in the horizontal or vertical part of the ring-shaped finishing member 950 with an 'L' shaped cross section, respectively. You can.

And, in the embodiment shown in FIG. 8, the vacuum holes 608 and 958 formed in the external metal tubes 600a and 600b or the finishing member 950, respectively, are vacuum holes inside the divided external metal tubes 600a and 600b, respectively. Since it is a structure for transmitting vacuum negative pressure in order to communicate with the vacuum part (V) inside the hole (500) and the chamber member (960), the position inside the vacuum hole in the chamber member must be in communication with the vacuum part in the external metal pipe. This is self-evident.

FIG. 9 shows a cross-sectional view of one embodiment of the vacuum partition device in a state in which the core portion of the superconducting cable of the present invention is removed. Descriptions that overlap with those with reference to FIGS. 4, 5, and 8 will be omitted.

The embodiment shown in FIG. 9 is different from the embodiment shown in FIG. 8 and has a structure including a corrugated member 970 instead of a finishing member for the bending characteristics of the vacuum partition device, and the corrugated member 970 also has the finishing described above. Like the member, a vacuum hole 978 may be provided. If the distance between the valley and the crest of the corrugated member is smaller than the distance between the valley and the crest of the external metal pipe, the vacuum hole 978 may be formed in an inner surface area other than the valley and the ridge.

Therefore, according to the vacuum partition device according to the present invention and the superconducting cable equipped with the same, the vacuum part for vacuum insulating the cooling part of the superconducting cable can be divided into a plurality of parts in the longitudinal direction of the superconducting cable, and maintenance of the superconducting cable can be performed. In order to do so, the work time and resulting costs for releasing the vacuum in the vacuum section or re-vacuuming the vacuum section when the vacuum is broken can be greatly shortened, and the vacuum section partition device itself is provided with a chamber member to form the vacuum section. Structure of a superconducting cable in which heat intrusion from the outside through the vacuum compartment device is minimized and the vacuum compartment is provided by sharing a vacuum port by forming a vacuum hole in the external metal pipe or vacuum compartment device within the chamber member. You can even achieve the effect of simplifying.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. It will be possible to implement it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, it should be considered to be included in the technical scope of the present invention.

1000: Superconducting cable
200: Cooling unit
300: Internal metal pipe
500: Vacuum part
600: External metal pipe
900: Vacuum partition device

Claims (31)

A core portion sequentially provided with a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer;
In order to cool the core part, an inner metal tube is provided outside the core part to form a cooling part through which a cryogenic refrigerant flows, and has a corrugation structure in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction;
In order to vacuum insulate the inner metal tube, a vacuum portion is formed outside the inner metal tube, and an outer metal tube of a corrugation structure is formed in which grooves and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction; and
The external metal tube is divided at predetermined intervals, is mounted between the divided external metal tubes to define a vacuum inside the external metal tube, and is provided with a chamber member to form its own vacuum part to prevent external heat intrusion. It includes a vacuum compartment partition device,
The chamber member is mounted to connect a pair of external metal tubes divided by the vacuum partition device, and both ends of the chamber member are joined to the outer surface of the external metal tube. According to paragraph 1,
A superconducting cable, wherein a plurality of the vacuum partition devices are installed spaced apart in the longitudinal direction of the superconducting cable. According to paragraph 1,
The vacuum section dividing device is a superconducting cable characterized in that it is mounted to connect the outer surface of the inner metal tube and the divided ends of the pair of outer metal tubes. According to paragraph 3,
The vacuum section dividing device is a superconducting cable characterized in that it includes a heat insulating member mounted between the outer surface of the inner metal tube and the end of the pair of outer metal tubes. According to paragraph 4,
A superconducting cable, wherein the vacuum section partition device is mounted to surround an outer surface of the inner metal tube and includes a metal sheet for flattening the outer surface of the inner metal tube, and the heat insulating member is mounted on the upper part of the metal sheet. According to clause 5,
A superconducting cable further comprising at least one sealing member mounted in a circumferential direction to seal between the inner surface of the insulation member and the outer surface of the metal sheet. According to clause 6,
A superconducting cable, wherein the sealing member is configured in the form of an O-ring and is seated in a seating groove formed on the inner surface of the insulation member. According to paragraph 4,
The vacuum partition device further includes a cover member made of metal mounted on the top of the insulating member and a pair of finishing members respectively closing and connecting the space between both ends of the cover member and the ends of the pair of external metal pipes. A superconducting cable characterized by comprising: According to clause 8,
A superconducting cable, characterized in that the finishing member is a ring member with an 'ㄱ' cross-sectional shape. According to clause 8,
A superconducting cable, wherein the pair of finishing members are respectively welded to the cover member and the pair of external metal tubes. According to paragraph 4,
The vacuum partition device closes and connects a cover member made of a metal mounted on the top of the insulation member and the space between both ends of the cover member and the ends of the pair of external metal pipes, and is made of a metal material and has grooves and A superconducting cable characterized by further comprising a corrugated member with a corrugation structure in which the ridges are repeated. According to clause 11,
A superconducting cable, wherein the corrugated member is made of aluminum or stainless steel and the gap between the ridges is smaller than the gap between the ridges of the inner metal tube or the outer metal tube. According to clause 11,
A superconducting cable, wherein the corrugated member is made of aluminum or stainless steel and has a thickness smaller than the thickness of the inner metal tube or the outer metal tube. According to clause 11,
A superconducting cable, wherein the pair of corrugated members are respectively welded to the cover member and the pair of external metal tubes. According to clause 11,
A superconducting cable further comprising at least one sealing member mounted in a circumferential direction to seal between the outer surface of the insulation member and the inner surface of the cover member. According to clause 15,
A superconducting cable, wherein the sealing member is configured in the form of an O-ring and is seated in a seating groove formed on the outer surface of the insulation member. According to clause 16,
The vacuum section dividing device is a superconducting cable characterized in that it is constructed by dividing the external metal tube with the external metal tube mounted on the outside of the internal metal tube and connecting each end of the divided external metal tube with the internal metal tube. According to clause 4,
A superconducting cable, wherein the insulation member is made of PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene) material. According to claim 6 or 15,
A superconducting cable, wherein the sealing member is configured in the form of an O-ring and is seated in a seating groove formed on the outer or inner surface of the insulation member. According to clause 8,
A superconducting cable, characterized in that the chamber member is joined to the outer surface of the external metal tube at a position surrounding the finishing member. According to clause 11,
A superconducting cable, characterized in that the chamber member is joined to the outer surface of an external metal tube at a position surrounding the corrugated member. According to claim 20 or 21,
A superconducting cable, characterized in that a pair of external metal tubes divided by the vacuum portion dividing device and a vacuum port are provided in each of the chamber members to evacuate the vacuum portion formed inside the chamber member. According to clause 8,
A superconducting cable, wherein at least one vacuum hole is formed in the external metal tube or the finishing member to communicate with the vacuum part inside the external metal tube within the chamber member. According to clause 11,
A superconducting cable, wherein at least one vacuum hole is formed in the external metal tube or the corrugated member to communicate with the vacuum part inside the external metal tube within the chamber member. According to claim 23 or 24,
A superconducting cable, wherein the vacuum hole is circular or track-shaped. According to clause 25,
When a plurality of vacuum holes are provided, the vacuum holes are formed within the finishing member to be spaced apart in the circumferential direction of the external metal tube, the finishing member, or the corrugated member. According to clause 24,
A superconducting cable characterized in that two or more vacuum ports are provided in a pair of external metal tubes partitioned by the chamber member and the vacuum partition device, and the vacuum negative pressure applied to the vacuum port is shared through the vacuum hole. . delete delete delete delete