High-voltage power cable composite sleeve terminal for motor train unit

Abstract

The utility model discloses a high-voltage power cable composite sleeve terminal for a motor train unit, and the lower part of a cable terminal is provided with a tail pipe through a cable terminal flange, and the tail pipe is internally provided with a compression nut, a compression cone and a sealing rubber sleeve in sequence; after the cable penetrates through the tail pipe and the cable terminal flange, the compression nut is screwed to enable the compression cone to extrude the sealing rubber sleeve, and the cable terminal is tightly attached to the cable through the sealing rubber sleeve. And the cable terminal wiring terminal is provided with a watchband contact finger and is in contact with the connecting pipe through the watchband contact finger. The cable terminal can solve the problems of non-uniform electric field distribution of the cable terminal and adaptability to high and low temperature sudden change and high-speed wind impact vibration.

Description

Technical Field

[0001] The utility model relates to a high-voltage cable terminal on a motor vehicle, in particular to a high-voltage power cable composite casing terminal for a motor vehicle. Background Art

[0002] High-voltage cable terminals on EMU trains (hereinafter referred to as "cable terminals" or "terminals") have become a top priority for maintaining the safe operation of the vehicle's high-voltage system due to their complex insulation structure, special installation location, large current carrying capacity, and harsh operating conditions such as frequent sudden changes in high and low temperatures, high-speed wind impact and vibration.

[0003] Currently, cable terminals used in high-speed trains primarily utilize heat-shrinkable, multi-layer composite insulation structures. After installation, these terminals primarily provide sealing, waterproofing, insulation, and electric field equalization. However, the assembly process for heat-shrinkable terminal terminals requires stripping the cable's sheath, shielding, and semiconductor layers, resulting in a highly uneven electric field at the terminal. Significant electric field concentration still exists within the terminal, leading to localized aging of the terminal's internal materials.

[0004] Prior art 1:

[0005] like Figure 1 As shown, the heat-shrinkable cable terminal, made of heat-shrinkable material with a rigid sleeve, is primarily assembled from multiple layers of insulating support tubes of varying sizes, heat-shrinkable control tubes, control adhesive, and silicone rubber sheds. The insulating support tubes primarily provide electrical insulation and support, while the heat-shrinkable control tubes primarily provide a uniform electric field.

[0006] During the assembly process of heat-shrinkable cable terminals, the cables need to be cut and polished, and the heat-shrinkable control tube, insulating support tube, etc. need to be heat-shrunk multiple times. The construction process is cumbersome. Due to the construction characteristics of heat-shrinkable materials, the heat-shrinkable terminal materials will have some irregularities or slight burns during installation, which may cause uneven electric field distribution at the cable terminal.

[0007] Disadvantages of the prior art 1:

[0008] During the assembly process of heat-shrinkable cable terminals, the cable sheath, shielding layer, and semiconductor layer need to be stripped off, resulting in an extremely uneven electric field at the cable terminal.

[0009] When the ambient temperature changes suddenly, the expansion and contraction rates of the heat shrink material and the cable are different, which can easily cause a gap between the cable and the cable terminal, leading to accidents.

[0010] In view of this, the present utility model is proposed. Utility Model Content

[0011] The purpose of the utility model is to provide a high-voltage power cable composite bushing terminal for EMUs, so as to solve the above-mentioned technical problems existing in the prior art.

[0012] The purpose of this utility model is achieved through the following technical solutions:

[0013] The utility model is a composite bushing terminal for high-voltage power cables used in EMUs. The lower part of the cable terminal is provided with a tail pipe 18 through a cable terminal flange 17. The tail pipe 18 is provided with a tightening nut 20, a tightening cone 19, and a sealing rubber sleeve 22 in sequence.

[0014] After the cable passes through the tail tube 18 and the cable terminal flange 17 , the compression nut 20 is tightened so that the compression cone 19 squeezes the sealing rubber sleeve 22 , and the cable terminal is tightly fitted between the sealing rubber sleeve 22 and the cable.

[0015] Compared with the prior art, the high-voltage power cable composite bushing terminal for EMUs provided by the utility model can solve the problems of uneven electric field distribution at the cable terminal and can adapt to sudden changes in high and low temperatures and high-speed wind impact vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a cable terminal structure with a multi-layer composite insulation structure in the prior art;

[0017] Figure 2 A schematic diagram of the terminal structure of a high-voltage power cable composite bushing for an EMU provided by an embodiment of the utility model;

[0018] In the picture:

[0019] 1. Heat shrinkable umbrella skirt, 2. Insulation support tube, 3. Insulation putty, 4. Heat shrinkable control tube, 5. Control putty, 6. Insulation sealing tube;

[0020] 11. Cable terminal, 12. Sealing ring 1, 13. Connecting tube, 14. Sealing cover, 15. Round nut, 16. Strap contact, 17. Cable terminal flange, 18. Tail pipe, 19. Compression cone, 20. Compression nut, 21. Heat shrink tubing, 22. Sealing rubber sleeve, 23. Sealing ring 2; DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them, and do not constitute a limitation of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] First, the following terms may be used in this article:

[0023] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y includes both “X” or “Y” and “X and Y”.

[0024] The terms "include," "comprises," "contains," "has," or other similar expressions should be interpreted as non-exclusive. For example, "including certain technical features (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products, or manufactured articles, etc.) should be interpreted as including not only the technical features explicitly listed, but also other technical features known in the art that are not explicitly listed.

[0025] The term "consisting of" excludes any technical features not explicitly listed. If used in a claim, this term renders the claim closed, excluding any technical features other than those explicitly listed, except for conventional impurities associated with them. If this term appears only in a clause of a claim, it limits only the elements explicitly listed in that clause; elements listed in other clauses are not excluded from the claim as a whole.

[0026] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this document based on specific circumstances.

[0027] The terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation to this document.

[0028] The contents not described in detail in the examples of this utility model belong to the prior art known to those skilled in the art. If specific conditions are not specified in the examples of this utility model, the experiments were carried out according to conventional conditions in the art or the conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments used in the examples of this utility model are not specified, they are all conventional products that can be purchased commercially.

[0029] The utility model is a composite bushing terminal for high-voltage power cables used in EMUs. The lower part of the cable terminal is provided with a tail pipe 18 through a cable terminal flange 17. The tail pipe 18 is provided with a tightening nut 20, a tightening cone 19, and a sealing rubber sleeve 22 in sequence.

[0030] After the cable passes through the tail tube 18 and the cable terminal flange 17 , the compression nut 20 is tightened so that the compression cone 19 squeezes the sealing rubber sleeve 22 , and the cable terminal is tightly fitted between the sealing rubber sleeve 22 and the cable.

[0031] The shielded copper wire of the cable is twisted into two strands and crimped into a terminal, which is then grounded to the tail pipe 18 using an M5 screw.

[0032] The cable terminal flange 17 is connected to the tail pipe 18 by M8 screws, and a sealing ring 23 is provided on the upper end surface of the tail pipe 18.

[0033] There is a sealing cover 14 on the upper part of the cable terminal, and a round nut 15 is installed on the upper part of the connecting pipe 13 at the cable end, and the round nut 15 is embedded in the groove of the sealing cover 14;

[0034] The cable terminal 11 is provided with a strap contact finger 16 , which contacts the connecting tube 13 via the strap contact finger 16 .

[0035] A sealing ring 12 is provided between the sealing cover 14 and the cable terminal 11 .

[0036] Heat shrink tubes 21 are provided on the upper and lower parts of the cable terminal.

[0037] All threads of the cable terminals are coated with waterproof sealant.

[0038] In summary, the high-voltage power cable composite bushing terminal for EMUs according to the embodiment of the utility model can solve the problems of uneven electric field distribution at the cable terminal and can adapt to sudden changes in high and low temperatures and high-speed wind impact vibration.

[0039] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail below with reference to specific embodiments.

[0040] Example 1

[0041] like Figure 2 As shown:

[0042] A tail tube 18 is installed at the bottom of the cable terminal. Tightening the compression nut 20 compresses the compression cone 19 against the sealing rubber sleeve 22, ensuring a tight fit between the cable terminal and the cable. The cable shielding copper wire is twisted into two strands and crimped into a terminal, which is then connected to the tail tube 18 with M5 screws to ground the shield. The cable terminal flange 17 is connected to the tail tube 18 with M8 screws. A sealing ring 23 is installed on the upper end of the tail tube.

[0043] The cable terminal has a sealing cap 14 on top, and a round nut 15 on top of the connecting tube 13, which fits into a groove in the sealing cap 14. The cable terminal 11 is equipped with a watchband contact 16, which contacts the connecting tube 13 to conduct high current and even out the electric field. A sealing ring 12 is installed between the sealing cap 14 and the cable terminal 11 to seal the upper portion of the cable terminal.

[0044] The upper and lower parts of the cable terminal are protected by heat shrinking tubes 21 to protect the top sealing cover 14 and the tail tube 18. All threads of the cable terminal are coated with waterproof sealant.

[0045] The utility model can optimize the problems of discharge and sealing failure in existing cable terminals, and can develop a cable terminal that can adapt to complex working conditions such as sudden changes in high and low temperatures of EMUs, high-speed wind impact vibration, etc., to ensure the safe and stable operation of the vehicle's high-voltage system.

[0046] Key technical points of the present invention:

[0047] The cable terminal is fixed by a compression nut, a compression cone and a sealing cover; the terminal block and the cable are connected by a connecting tube, and a strap contact is used between the connecting tube and the terminal block to carry large current.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art.

Claims

1. A high-voltage power cable composite bushing terminal for EMU, characterized in that: A tail pipe (18) is installed at the lower part of the cable terminal through a cable terminal flange (17), and a tightening nut (20), a tightening cone (19), and a sealing rubber sleeve (22) are arranged in sequence in the tail pipe (18); After the cable passes through the tail tube (18) and the cable terminal flange (17), the compression nut (20) is tightened to allow the compression cone (19) to squeeze the sealing rubber sleeve (22), and the cable terminal is tightly fitted with the cable through the sealing rubber sleeve (22).

2. The high-voltage power cable composite bushing terminal for EMU according to claim 1, characterized in that: The shielded copper wire of the cable is twisted into two strands and crimped into a terminal, which is then connected to the tail pipe (18) for grounding via an M5 screw.

3. The high-voltage power cable composite bushing terminal for EMU according to claim 2, characterized in that: The cable terminal flange (17) and the tail pipe (18) are connected via M8 screws, and a sealing ring 2 (23) is provided on the upper end surface of the tail pipe (18).

4. The high-voltage power cable composite bushing terminal for EMU according to claim 3, characterized in that: A sealing cover (14) is provided on the upper part of the cable terminal, a round nut (15) is provided on the upper part of the connecting pipe (13) at the cable end, and the round nut (15) is embedded in the groove of the sealing cover (14); The cable terminal connection terminal (11) is provided with a band contact finger (16) and contacts the connection pipe (13) through the band contact finger (16).

5. The high-voltage power cable composite bushing terminal for EMU according to claim 4, characterized in that: A sealing ring (12) is provided between the sealing cover (14) and the cable terminal connection terminal (11).

6. The high-voltage power cable composite bushing terminal for EMU according to claim 5, characterized in that: The upper part and the lower part of the cable terminal are both provided with heat shrink tubes (21).

7. The high-voltage power cable composite bushing terminal for EMU according to any one of claims 1 to 6, characterized in that: All threads of the cable terminals are coated with waterproof sealant.

Images