阅读说明：本技术 一种紧凑式超导电缆及具有其的电缆组件 (Compact superconducting cable and cable assembly with same ) 是由 宋萌 薛济萍 薛驰 黄勇 王邦柱 于 2021-07-02 设计创作，主要内容包括：本发明提供一种紧凑式超导电缆及具有其的电缆组件,属于超导电缆技术领域,其中,紧凑式超导电缆包括：护套及至少一个导体芯,护套内设有绝热层,导体芯设置在绝热层内部,导体芯与绝热层之间具有制冷工质通道,制冷工质通道内设有隔离部,隔离部将制冷工质通道分隔成型有用以制冷工质流入的流入通道,及用以制冷工质折返回流的流出通道。本发明提供的紧凑式超导电缆,通过将回流的制冷工质通道集成在超导电缆内部,而可减少电缆的工作成本,并可降低制冷工质受外界热量的影响,从而减少系统整体的热负荷。(The invention provides a compact superconducting cable and a cable assembly with the same, belonging to the technical field of superconducting cables, wherein the compact superconducting cable comprises: the cable comprises a sheath and at least one conductor core, wherein a heat insulation layer is arranged in the sheath, the conductor core is arranged in the heat insulation layer, a refrigeration working medium channel is arranged between the conductor core and the heat insulation layer, an isolation part is arranged in the refrigeration working medium channel, and the isolation part divides and forms the refrigeration working medium channel into an inflow channel for inflow of the refrigeration working medium and an outflow channel for return and backflow of the refrigeration working medium. The compact superconducting cable provided by the invention has the advantages that the returned refrigerating working medium channel is integrated in the superconducting cable, so that the working cost of the cable can be reduced, the influence of external heat on the refrigerating working medium can be reduced, and the overall heat load of the system can be reduced.)

1. A compact superconducting cable, comprising:

the heat insulation layer (3) is arranged in the sheath;

at least one conductor core (1) is arranged inside the heat insulating layer (3), a refrigeration working medium channel is arranged between the conductor core (1) and the heat insulating layer (3), an isolating part is arranged in the refrigeration working medium channel, and the isolating part divides the refrigeration working medium channel into an inflow channel (5) for inflow of the refrigeration working medium and an outflow channel (6) for return backflow of the refrigeration working medium.

2. The compact superconducting cable according to claim 1, wherein the separation portion is a separation tube (4) sleeved outside the conductor core (1), the inflow channel (5) is formed between the separation tube (4) and the conductor core (1), and the outflow channel (6) is formed between the separation tube (4) and the heat insulating layer (3).

3. The compact superconducting cable according to claim 2, characterized in that the insulating tube (4) is a corrugated tube.

4. The compact superconducting cable according to claim 1, characterized in that the conductor core (1) has several twisted with each other, the twisted conductor core (1) being fastened by a binder structure.

5. The compact superconducting cable according to claim 4, characterized in that the conductor core (1) has three of the stranded fastenings.

6. The compact superconducting cable according to claim 1, wherein the conductor core (1) comprises a supporting framework (101), a superconducting conductor layer (102), an insulating layer (103) and a superconducting shielding layer (104) arranged in sequence from inside to outside, and at least one measuring optical fiber is arranged in the supporting framework (101).

7. The compact superconducting cable according to any one of claims 1 to 6, wherein the thermal insulation layer (3) comprises an outer dewar tube (302) and an inner dewar tube (301) sleeved in the outer dewar tube (302), wherein a plurality of layers of super insulating materials (303) are wound between the inner dewar tube (301) and the outer dewar tube (302), and a vacuum is formed between the inner dewar tube (301) and the outer dewar tube (302).

8. The compact superconducting cable of claim 7, wherein the inner dewar tube (301) and the outer dewar tube (302) are made of an aluminum alloy material.

9. The compact superconducting cable of claim 1, wherein the refrigerant is liquid nitrogen.

10. A cable assembly comprising a compact superconducting cable according to any one of claims 1 to 9, and further comprising cable terminations provided at both ends of the compact superconducting cable, at least one of the cable terminations having a cryostat positioned therein adapted to exchange heat with and cool down said refrigerant.

Technical Field

The invention relates to the technical field of superconducting cables, in particular to a compact superconducting cable and a cable assembly with the same.

Background

Compared with the conventional cable, the superconducting cable has the advantages that the transmission capacity is improved by about 10 times under the same section, the transmission loss is reduced by 1/4-1/2, and the superconducting cable has remarkable technical advantages in the scenes of large-current industrial application such as high-load-density urban line capacity expansion, new energy electric energy transmission, electrolysis and the like.

Although the appearance of the cable body of the three-core superconducting cable is relatively compact and is equivalent to that of a three-phase coaxial type, the three-core superconducting cable can form a complete liquid nitrogen circulating system only by adopting an independent backflow pipeline, so that the occupied area requirement of the three-core superconducting cable is improved, the independent backflow pipeline carries external heat, the heat load of the system is increased, the use cost of the superconducting cable is improved, and the working stability of the superconducting cable is also reduced.

In addition, under a long-term working environment of the conventional superconducting cable, the outer heat insulation sheath layer of the superconducting cable is aged due to the service life or environmental influence, and the local temperature sudden change of the superconducting cable is influenced by the local performance degradation of the superconducting cable, so that the stable working state of the superconducting cable is influenced.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect that the superconducting cable needs to be provided with an independent return pipeline to circularly cool the working medium in the prior art, thereby providing a compact superconducting cable and a cable assembly having the same.

In order to solve the above technical problem, the present invention provides a compact superconducting cable, comprising:

the heat insulation layer is arranged in the sheath;

the conductor core is arranged inside the heat insulation layer, a refrigeration working medium channel is arranged between the conductor core and the heat insulation layer, an isolation part is arranged in the refrigeration working medium channel, and the isolation part divides and forms the refrigeration working medium channel into an inflow channel for inflow of the refrigeration working medium and an outflow channel for return backflow of the refrigeration working medium.

Optionally, the isolation portion is an isolation tube sleeved outside the conductor core, the inflow channel is formed between the isolation tube and the conductor core, and the outflow channel is formed between the isolation tube and the heat insulation layer.

Optionally, the isolation tube is a bellows.

Optionally, the conductor core has several twisted with each other, the twisted conductor core being fastened by a binder structure.

Optionally, the conductor core has three of the stranded fastenings.

Optionally, the conductor core includes a supporting framework, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer, which are sequentially disposed from inside to outside, and at least one measuring optical fiber is disposed in the supporting framework.

Optionally, the thermal insulation layer comprises an outer dewar pipe and an inner dewar pipe sleeved in the outer dewar pipe, wherein a plurality of layers of super thermal insulation materials are wound between the inner dewar pipe and the outer dewar pipe, and the inner dewar pipe and the outer dewar pipe are in vacuum.

Optionally, the inner and outer dewar tubes are made of an aluminium alloy material.

Optionally, the refrigerant is liquid nitrogen.

The invention also provides a cable assembly which comprises the compact superconducting cable in any one of the schemes and cable terminals arranged at two ends of the compact superconducting cable, wherein a cryostat suitable for heat exchange and cooling of the refrigeration working medium is arranged in the cable terminal at least one end.

The technical scheme of the invention has the following advantages:

1. the compact superconducting cable provided by the invention is characterized in that a refrigerating working medium channel is arranged between the heat insulation layer and the conductor core, and the refrigerating working medium channel is divided and formed into an inflow channel for the inflow of a refrigerating working medium and an outflow channel for the return and backflow of the refrigerating working medium by utilizing the separation part. Through the arrangement, the independent return pipeline is integrated in the superconducting cable, so that the compact design of the superconducting cable is facilitated; in addition, the refrigeration working medium channel corresponding to the heat insulating layer can be used as a new low-temperature cold screen isolating layer to play a cooling role for the conductor core positioned in the channel, so that the temperature of the refrigeration working medium is more stable, faults such as local temperature mutation caused by the local performance degradation of the heat insulating layer are not easy to occur, and the running stability of the superconducting cable is improved.

2. According to the compact superconducting cable provided by the invention, the isolation part is the isolation pipe sleeved outside the conductor core, the isolation pipe divides the channel into the inflow channel and the outflow channel, the isolation pipe is convenient for the overall assembly of the superconducting cable, and the isolation pipe adopts a corrugated pipe structure to have better bending flexibility without additional support of a support framework, so that the compact superconducting cable has better use effect.

3. According to the compact superconducting cable provided by the invention, the measuring optical fiber is arranged in the supporting framework of the conductor core and is relatively close to the main body of the conductor core, so that the measuring precision of the temperature measuring optical fiber is favorably improved, and the error is reduced.

4. In the compact superconducting cable provided by the invention, the heat insulating layer comprises the outer pipe of the Dewar pipe and the inner pipe of the Dewar pipe sleeved in the outer pipe of the Dewar pipe, a plurality of layers of super heat insulating materials are wound between the inner pipe of the Dewar pipe and the outer pipe of the Dewar pipe, and vacuum is formed between the inner pipe of the Dewar pipe and the outer pipe of the Dewar pipe.

5. The invention provides a cable assembly having the advantages of any one of the above aspects due to the compact superconducting cable of any one of the above aspects; in addition, the cable assembly is provided with the cryostat at least at one end of the cable terminal arranged at two ends of the cable, which is beneficial to carrying out high-efficiency cooling on the refrigeration working medium in the inflow channel and the outflow channel, thereby being beneficial to maintaining good working environment of the superconducting cable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a sectional view of a superconducting cable according to the present invention;

fig. 2 is a schematic view showing a circulation direction of a refrigerant of the superconducting cable according to the present invention;

fig. 3 is a cross-sectional view of a conductor core according to the present invention.

Description of reference numerals:

1. a conductor core; 2. banding; 3. a heat insulating layer; 4. an isolation pipe; 5. an inflow channel; 6. an outflow channel;

101. a support framework; 102. a superconducting conductor layer; 103. an insulating layer; 104. a superconducting shielding layer;

301. an inner dewar tube; 302. an outer dewar tube; 303. super insulation material.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

The embodiment relates to a compact superconducting cable, including sheath and at least one conductor core 1, be equipped with heat insulation layer 3 in the sheath, conductor core 1 sets up inside heat insulation layer 3, has the refrigeration working medium passageway between conductor core 1 and the heat insulation layer 3, is equipped with the isolated part in the refrigeration working medium passageway, and the isolated part separates the shaping with the refrigeration working medium passageway and has inflow channel 5 for the inflow of refrigeration working medium, and the outflow channel 6 for the backward flow of turning back of refrigeration working medium.

Based on the above overall structure design, one embodiment of the compact superconducting cable according to the present invention is shown in fig. 1, the sheath of the superconducting cable may be made of an existing mature sheath material, and the conductor core 1 has a plurality of conductor cores arranged to be twisted with each other, where it is preferable that the conductor core 1 has three twisted and fastened conductors, the three conductor cores 1 have the same structure and thus form an ac three-phase conductor path, the three conductor cores 1 are twisted by a hoop 2 in a length direction according to a certain pitch and tightness, and the cross section of the twisted conductor core 1 forms a "product" shape, thereby being beneficial to balancing reactance and being beneficial to handling cold shrinkage of the conductor core 1 at low temperature. It should be noted that in the present embodiment, a twisted three-core cable is taken as an illustration, and details thereof are not described below.

In this embodiment, the heat insulating layer 3 includes an outer dewar tube 302 and an inner dewar tube 301 sleeved in the outer dewar tube 302, wherein a plurality of layers of super heat insulating materials 303 are wound between the inner dewar tube 301 and the outer dewar tube 302, and the inner dewar tube 301 and the outer dewar tube 302 are in vacuum. Here, the inner dewar tube 301 and the outer dewar tube 302 may be made of stainless steel, titanium alloy, or aluminum alloy, which has good mechanical properties and heat conductivity at low temperature, and the inner tube and the outer tube are formed into a corrugated structure by extrusion molding, thereby having good bending flexibility and reducing the influence of extrusion deformation. Here, the super insulating material 303 may be a conventional mature insulating material, which is directly wound between the inner pipe 301 and the outer pipe 302 of the dewar pipe, and the super insulating material 303 and the vacuum process may be used to maximally suppress convection, heat conduction, and heat radiation, thereby providing the heat insulating layer 3 with a good heat insulating effect.

As one embodiment, as shown in fig. 1 and fig. 2, the isolation portion in this embodiment adopts an isolation tube 4 sleeved outside the conductor core 1, the inflow channel 5 is formed between the isolation tube 4 and the conductor core 1, the outflow channel 6 is formed between the isolation tube 4 and the heat insulation layer 3, and the refrigerant inflow channel 5 is provided between the isolation tube 4 and the conductor core 1, so that the temperature of the refrigerant inflow channel is lower than that of the refrigerant in the outflow channel 6, and the heat generated by the conductor core 1 is more, thereby being beneficial to ensuring a better refrigeration environment of the low-temperature refrigerant to the conductor core 1. Preferably, the isolation tube 4 is of a bellows structure, so as to ensure good bending flexibility after being pressed by force, and prevent the isolation tube 4 from being broken due to bending. The refrigerant is preferably a conventional mature liquid nitrogen material, which is not described in detail in this embodiment.

In the present embodiment, the embodiment of the spacer may be: a plurality of refrigeration working medium channels are uniformly arranged between the conductor core 1 and the heat insulating layer 3 in the circumferential direction, and the flow directions of the adjacent refrigeration working medium channels are opposite; or the working medium channel between the heat insulating layer 3 and the conductor core 1 is divided by the isolating part in a dividing layer mode, so long as a bidirectional channel for inflow and return outflow is ensured in the space.

As shown in fig. 3, the conductor core 1 includes a supporting framework 101, a superconducting conductor layer 102, an insulating layer 103, and a superconducting shielding layer 104, which are sequentially disposed from inside to outside, and at least one measuring optical fiber is disposed in the supporting framework 101. Here, this supporting framework 101 is as the supporting mechanism of cable core, and it can adopt the bellows structure that stainless steel or other materials supported, also can adopt configurations such as coil spring, copper strand, and temperature measurement optic fibre locates inside this supporting framework 101, and it is close to conductor core 1 main part relatively to be favorable to promoting the measurement accuracy of temperature measurement optic fibre, reduce the error. Here, as the measuring fiber, an existing mature fiber capable of measuring physical quantities such as temperature and stress along the superconducting cable is preferably used.

Example 2

The embodiment relates to a cable assembly, which comprises a compact superconducting cable as in the first embodiment, and further comprises cable terminals arranged at two ends of the compact superconducting cable, wherein a cryostat suitable for heat exchange and temperature reduction of a refrigeration working medium is arranged in each cable terminal.

In this case, as a preferred embodiment, the cryostat is disposed at the end turn-back position of the superconducting cable to perform cooling and heat exchange on the returned heat-carrying working medium, and the cryostat is disposed at each of the two ends, which is advantageous for efficiently cooling the cooling working medium in the inflow channel and the outflow channel, thereby maintaining a good working environment of the superconducting cable. The cryostat may be an existing mature cryogenic refrigeration device and will not be described in detail in this embodiment.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.