A water medium liquid cooling cable

Abstract

The present invention relates to the field of charging cables, and specifically refers to a water-medium liquid-cooled cable, comprising a liquid-cooled water inlet pipe, two liquid-cooled main conductors, each of which comprises a liquid-cooled water outlet pipe, an insulating isolation layer, a conductor layer and a main-line insulating layer from the inside to the outside, wherein the liquid-cooled water outlet pipe, the insulating isolation layer, the conductor layer and the main-line insulating layer are coaxially arranged in layers. The insulating isolation layer between the liquid-cooled water outlet pipe and the conductor layer effectively prevents frost from forming due to large temperature changes in the liquid-cooled pipe, leading to oxidation or short circuit of the conductor layer and other undesirable phenomena, and improves the heat dissipation performance, reliability and stability of the entire cable.

Description

Technical Field

[0001] The present invention relates to the field of charging cables, and in particular to a water-medium liquid-cooled cable. Background Art

[0002] At present, the charging piles used for electric buses are medium-power charging piles, with a DC voltage of 750 volts and an output current of less than 250 amperes. Taking the charging of new energy electric buses as an example, if a medium-power charging pile is used to charge, it takes at least three hours to fully charge the entire vehicle battery. Obviously, medium-power charging piles can no longer meet the needs of fast charging of new energy vehicles that are changing with each passing day and increasing by leaps and bounds. The high-power charging piles being developed in China have technical parameters: DC charging voltage of 1000-1500 volts, output DC current of 500-600 amperes. If a high-power charging pile is used for charging, taking the charging of new energy electric buses as an example, it only takes 15 minutes to fully charge the entire vehicle battery.

[0003] A high-power charging pile consists of three parts: power supply, liquid-cooled cable, and charging gun. The liquid-cooled cable connects the power supply and the charging gun. When charging an electric car, the staff holds the charging gun in one hand and pulls the cable to the appropriate position with the other hand. The staff's limbs often touch the cable. This requires that the liquid-cooled cables DC+ and DC- for high-power charging piles should be as light as possible and as small in diameter as possible, while meeting safety indicators and charging efficiency.

[0004] The cable connecting the power supply of the medium-power charging pile and the charging gun has an outer diameter of 39 mm. It is a dry integrated cable. The insulation outer sheath contains: two dry cables DC+ and DC-, a 25 square millimeter PE wire, fourteen signal wires, and the rest are fillers. The liquid-cooled cables used in high-power charging piles and the dry cables used in medium-power charging piles have similarities and differences in structure. The difference is that the soft wires of the two dry cables DC+ and DC- used in medium-power charging piles are 70 square millimeters, carrying a current of 250 amperes, and are not cooled by coolant. The soft wires of the two liquid-cooled cables DC+ and DC- used in high-power charging piles are 35 square millimeters, carrying a current of 600 amperes, and the inside of the cable can be cooled by circulating coolant. There is a gap between the outer sheath insulation sleeve of the two liquid-cooled cables DC+ and DC- used in high-power charging piles and the conductor. This gap is the coolant channel of the liquid-cooled cable. Traditional water-medium liquid cooling cables take up a large space, and the liquid cooling tube is placed on one side of the copper wire with a small contact area and poor heat dissipation effect. In addition, in this structure, due to the temperature change of the water medium in the liquid cooling tube, frost may form on the surface of the liquid cooling tube, which will cause oxidation of the copper wire and short circuit of DC+ / DC-. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the surface of the existing water medium liquid cooling pipe is prone to frost, and to provide a water medium liquid cooling cable

[0006] To achieve the above-mentioned purpose, the present invention provides a water-medium liquid-cooled cable, comprising a signal conductor, a grounding core, a liquid-cooled main conductor, and a sheath layer for wrapping. The water-medium liquid-cooled cable also includes a liquid-cooled water inlet pipe. The number of the liquid-cooled main conductors is two, and each liquid-cooled main conductor includes, from the inside to the outside, a liquid-cooled water outlet pipe, an insulating isolation layer, a conductor layer, and a main line insulation layer. The liquid-cooled water outlet pipe, the insulating isolation layer, the conductor layer, and the main line insulation layer are coaxially arranged in layers.

[0007] Preferably, the two liquid-cooling water outlet pipes are separated from each other and are located on the first radial center line of the water medium liquid-cooling cable.

[0008] Preferably, the liquid cooling water inlet pipe and the grounding wire core are located on the second radial center line of the water medium liquid cooling cable, and the first radial center line is perpendicular to the second radial center line.

[0009] Preferably, the signal conductor is located between the grounding conductor core and the liquid-cooling main conductor and the outer surfaces of the conductors are stacked and in contact with each other.

[0010] Preferably, the water-medium liquid-cooling cable further comprises a plurality of wire cores wrapped by a sheath layer, and the wire cores are located on one side of the liquid-cooling main wire and are not in contact with the signal wires.

[0011] Preferably, the main material of the liquid cooling water outlet pipe includes polyester rubber, polytetrafluoroethylene or polyamide or a mixture of the above.

[0012] The water-medium liquid-cooled cable of the present invention comprises a liquid-cooling water inlet pipe and two liquid-cooling main conductors, each of which comprises a liquid-cooling water outlet pipe, an insulating isolation layer, a conductor layer and a main conductor insulation layer from the inside to the outside, and the liquid-cooling water outlet pipe, the insulating isolation layer, the conductor layer and the main conductor insulation layer are coaxially arranged in layers. The insulating isolation layer between the liquid-cooling water outlet pipe and the conductor layer effectively prevents frost from being generated due to large temperature changes, resulting in oxidation or short circuit of the conductor layer and other undesirable phenomena, and improves the heat dissipation performance, reliability and stability of the entire cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0014] Figure 1It is a schematic structural diagram of an embodiment of a water medium liquid cooling cable of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Attachment Figure 1 As shown, the water medium liquid cooling cable 100 of the present invention includes a sheath layer 60 with a circular cross-section at the outermost layer. The hardness of the sheath layer 60 is 80-90A, and the tear strength is 40-50N / mm, which can effectively protect all the wire cores located inside. The water medium liquid cooling cable 100 also includes multiple signal wires 10, a ground wire core 20, a liquid cooling main wire 40, and a liquid cooling water inlet pipe 30. The number of the liquid cooling main wires 40 is two, and each liquid cooling main wire 40 includes a liquid cooling outlet pipe 41, an insulating isolation layer 42, a wire layer 43 and a main wire insulation layer 44 from the inside to the outside. The liquid cooling outlet pipe 41, the insulating isolation layer 42, the wire layer 43 and the main wire insulation layer 44 are sequentially layered and coaxially arranged. The liquid cooling outlet pipe 41 has a cooling channel for the water medium to flow. The above components are included in the sheath layer 60 made of environmentally friendly radiation cross-linked polyolefin material, so that the liquid cooling cable 100 has good heat dissipation, is halogen-free and non-toxic, and completely does not contain toxic substances such as halogen, and its flame retardancy can reach Class A level.

[0017] During the charging process of the cable, one of the two liquid-cooled main conductors 40 is used as the positive main conductor, and the other is used as the negative main conductor. The liquid-cooled water outlet pipe 41 inside is connected to the liquid pump in the charging pile, and forms a cooling circuit with the liquid-cooled water inlet pipe 30. The liquid-cooled water outlet pipe 41 can take away the heat generated by the outer conductor layer 43, so that the outermost main wire insulation layer 44 absorbs the heat of the grounding core 20 and other signal conductors 10 in contact with the outer surface to reduce the temperature of each core, thereby improving the current carrying capacity of the cable and assisting in improving the heat dissipation performance. The present invention adopts a design of one water inlet pipe and two water outlet pipes, which is conducive to improving the self-heat dissipation of the cold night cable 100. In addition, the insulating isolation layer 42 between the liquid-cooled water outlet pipe 41 and the conductor layer 43 effectively prevents frost from forming on the surface of the liquid-cooled water outlet pipe 41 due to large temperature changes, resulting in oxidation or short circuit of the conductor layer 43 and other undesirable phenomena. The insulating isolation layer 42 is tightly wrapped around the outer layer of the liquid cooling outlet pipe 41, and its shrinkage rate is substantially consistent with that of the liquid cooling outlet pipe 41. The main material of the liquid cooling outlet pipe includes polyester rubber, polytetrafluoroethylene or polyamide or a mixture of several thereof.

[0018] In this embodiment, the two liquid-cooling outlet water pipes 41 are separated from each other and are located on the first radial center line A1 of the water-medium liquid-cooling cable 100.

[0019] The liquid-cooling inlet water pipe 30 and the grounding wire core 20 are located on the second radial center line A2 of the water-medium liquid-cooling cable 100, and the first radial center line A1 is perpendicular to the second radial center line A2. In this way, the contact area for cooling can be maximally increased.

[0020] Specifically, the number of the signal wires 10 is two, and they are respectively located between the grounding wire core 20 and the liquid-cooling main wire 40 and are stacked and in contact with each other in the shape of the Chinese character "pin" to increase the outer surface area of the cooling contact.

[0021] In addition, the water-medium liquid-cooling cable further includes a plurality of wire cores 50 wrapped by a sheath layer. The wire cores 50 are located on one side of the liquid-cooling main wire 40 and do not contact the signal wires 20 to avoid signal interference.

[0022] For the water-medium liquid-cooling cable 100 of the present invention, an insulating isolation layer 42 is provided between the liquid-cooling outlet water pipe and the wire layer, which can effectively prevent bad phenomena such as oxidation or short circuit of the wire layer 43 caused by the frosting phenomenon due to large temperature changes. Increasing the contact area between the wire layer 43 and the cooling pipe makes the contact more uniform with each other, and can take away the heat of the wire layer and other heating wire cores, greatly improving the heat dissipation capacity of this kind of liquid-cooling cable. Thus, without changing the cross-sectional area of the cable, the performance of the cable for passing current can be greatly improved; the insulating isolation layer 42 further improves the anti-deformation ability and deformation recovery ability of this kind of cable, and improves the structural stability of this kind of cable 100.

[0023] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A water-medium liquid-cooled cable, comprising a signal conductor, a grounding core, a liquid-cooled main conductor, and a sheath layer for wrapping, characterized in that: The water-medium liquid-cooled cable also includes a liquid-cooling water inlet pipe. The number of the liquid-cooling main conductors is two. Each liquid-cooling main conductor includes, from the inside to the outside, a liquid-cooling water outlet pipe, an insulating isolation layer, a conductor layer and a main-line insulation layer. The liquid-cooling water outlet pipe, the insulating isolation layer, the conductor layer and the main-line insulation layer are coaxially arranged in layers.

2. The water-medium liquid-cooled cable according to claim 1, characterized in that: The two liquid-cooling water outlet pipes are separated from each other and are located on the first radial center line of the water medium liquid-cooling cable.

3. The water-medium liquid-cooled cable according to claim 2, characterized in that: The liquid-cooling water inlet pipe and the grounding core are located on the second radial center line of the water-medium liquid-cooling cable, and the first radial center line is perpendicular to the second radial center line.

4. The water-medium liquid-cooled cable according to claim 3, characterized in that: The signal conductor is located between the ground conductor core and the liquid-cooling main conductor and the outer surfaces of the conductors are stacked and in contact with each other.

5. The water-medium liquid-cooled cable according to claim 4, characterized in that: The water-medium liquid-cooling cable further comprises a plurality of wire cores wrapped by a sheath layer, wherein the wire cores are located on one side of the liquid-cooling main wire and are not in contact with the signal wires.

6. The water-medium liquid-cooled cable according to claim 5, characterized in that: The main material of the liquid cooling water outlet pipe includes polyester rubber, polytetrafluoroethylene or polyamide or a mixture of the above.

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