CN210016002U - A high-voltage cable L-type connector for EMU - Google Patents

Abstract

The utility model relates to an L-shaped connector for a high-voltage cable for an EMU. The connector includes a protection unit and a pair of L-shaped connector units arranged in the protection unit; the pair of connector units is connected by an L-shaped connector, the L-shaped connector includes an L-shaped central conductor arranged in a socket and L-shaped insulating sleeve; the joint unit includes contact heads, stress cones, compression fittings and protective fittings arranged in sequence; both ends of the L-shaped central conductor are provided with grooves matched with the contact heads and the stress cones. The high-voltage cable L-type connector for EMUs of the utility model has the advantages of simple structure, pluggability, convenient installation, good flame retardancy, convenient installation and maintenance, high stability, and can effectively cope with cables in the high-voltage jumper system of EMUs. The arrangement is suitable for large-scale promotion.

Description

A high-voltage cable L-type connector for EMU

technical field

The utility model relates to an L-shaped connector for a high-voltage cable for an EMU, which belongs to the technical field of electric equipment for an EMU.

Background technique

With the continuous improvement of my country's transportation industry, China's EMUs have ushered in a golden age of construction and development. The 27.5kV L-type connector is an important part of the EMU's traction power supply system, and its reliability directly affects the safe operation of the EMU. Among them, the L-shaped connector is installed on the top of the train of the EMU and connects the cables between the carriages. On the EMU train, the two connecting cables are located in the middle of the top of the train and in the dark pipe on the edge of the top of the car, and the directions of the two cables are the same as the direction of the train. In order to meet the cable connection requirements of the EMU, the L-type connector came into being.

In recent years, with the continuous development of the rail transit industry, the country has higher and higher requirements for the performance of 27.5kV L-type connectors for EMUs. At present, the products are imported from abroad, and the products are monopolized by companies such as Tyco of the United States, Nexans of France, and Hitachi of Japan. Its supply is expensive and its performance cannot fully meet the requirements of use, which seriously restricts the development of my country's EMU industry.

Moreover, foreign imported products cannot fully meet the use requirements in the following performance aspects: they cannot effectively deal with the arrangement of cables in the high-voltage jumper system of EMUs; they cannot fully meet the electrical performance requirements specified in GB/T 28427-2012 (AC withstand voltage 124kV* 5min no flashover, no breakdown, impulse voltage ±250kV*10 times no breakdown, no flashover); unable to fully meet the pluggable function, inconvenient for product installation and post-maintenance; unable to fully meet the flame retardant requirements ( Combustion grade S4, smoke grade SR2, drip grade ST2 in DIN 5510-2; oxygen index R22/R23, smoke density R22/R23, toxicity test R22/R23 in EN44545-2); cannot fully meet the surface pressure stability within 30 years sexual requirements. At present, the performance of 27.5kV L-type connectors seriously restricts the development of railway transportation in China. Therefore, the development of 27.5kV L-type connector will have very important value for the development of my country's railway.

Utility model content

In view of the deficiencies of the prior art, the utility model provides an L-shaped connector for a high-voltage cable for an EMU.

The technical scheme of the present utility model is:

An L-shaped connector for a high-voltage cable for an EMU, comprising a protection unit and a pair of L-shaped joint units arranged in the protection unit; the pair of joint units are connected by an L-shaped connector, and the L-shaped connector includes The L-shaped central conductor and the L-shaped insulating sleeve arranged in a sleeve; the joint unit includes a contact head, a stress cone, a compression fitting and a protective fitting arranged in sequence; both ends of the L-shaped central conductor are provided with contact heads and The groove in which the stress cone fits;

One end of the contact head is pluggably connected to the L-shaped center conductor, and the other end is connected to the cable; the stress cone is a conical structure, and the two ends of the stress cone are respectively provided with grooves, compression grooves and compression grooves with the ends of the L-shaped center conductors. The upper and lower slopes are matched with the fittings; the stress cone is inserted into the groove at the end of the L-shaped central conductor after being sleeved with the cable; the compression fitting is a cylindrical structure, and one end of the compression fitting is provided with a The other end of the inclined surface matched with the inclined surface is connected with the compression spring, and the other end of the compression spring acts on the protective hardware; the stress cone is embedded in the L-shaped insulating sleeve;

The protection unit includes an L-shaped protection shell and an L-shaped cover plate matched with the L-shaped protection shell; the protection unit is open at both ends, and the joint unit is embedded in the opening at the end of the protection unit; protection hardware and protection The openings at the ends of the unit are sealed to connect.

Preferably, the L-shaped insulating sleeve is composed of a long tube and a short tube. The insulating sleeve is short and long, which is easy to distinguish between installation units.

Preferably, the material of the L-shaped central conductor is one of aluminum, aluminum alloy, copper or copper alloy, and the surface layer is treated with coating; the material of the L-shaped insulating sleeve is one of epoxy resin or glass fiber reinforced plastic; the stress cone is The material is one of EPDM rubber or silicone rubber; the contact head is one of aluminum, aluminum alloy, copper or copper alloy, and the surface layer is treated with coating; the material of the compression fitting is aluminum, aluminum alloy, One of copper, copper alloy stainless steel or glass fiber reinforced plastic; the protective hardware is one of aluminum, aluminum alloy, copper, copper alloy or stainless steel; inorganic resistance is added to the components of the L-shaped insulating sleeve and the stress cone. Burning agent and organic flame retardant; the material of the protection unit is one of aluminum, aluminum alloy, copper, copper alloy or stainless steel, and the surface is treated with plating. The coating design can meet the salt spray test GB/T 2423.17-2009.

Further preferably, the aluminum alloy includes Al-Cu series alloy, Al-Mg-Si series alloy, and Al-Cu-Mg series alloy; and the copper alloy includes beryllium bronze.

Preferably, the L-shaped insulating sleeve is a cross-linked and cured molding structure, and the L-shaped central conductor is embedded in the L-shaped insulating sleeve. For traditional products with similar structure, due to the difficulty in controlling the adhesion between the insulating material used in the insulating sleeve and the metal material of the center conductor, the actual product is prone to peeling, air bubbles and other abnormalities that affect the electrical performance, and partial discharge occurs during use, which eventually leads to the aging of the insulating material. breakdown problem. By increasing the bonding strength of the contact surface between the L-shaped central conductor and the L-shaped insulating sleeve, anomalies such as peeling of the two materials and air bubbles are avoided.

Preferably, the groove at the end of the L-shaped central conductor is provided with a strap contact finger reed insertion hole structure. The contact head and the center conductor are connected by plug connection. By designing the strap structure in the inner cavity of the center conductor to conduct conduction with the contact head, the allowable requirements of large current can be achieved, and more than 30 times of plug-in installation can be achieved, which is convenient for product installation. and maintenance.

Preferably, the use matching length H of the L-shaped insulating sleeve is 320±50mm, and the diameter D is φ138mm.

The beneficial effects of the present utility model are:

1. The high-voltage cable L-type connector for EMUs of the present utility model has the advantages of simple structure, pluggability, convenient installation, good flame retardancy, convenient installation and maintenance, high stability, and can effectively cope with the high-voltage jumper system of EMUs. The arrangement of cables is suitable for large-scale promotion;

2. The L-shaped connector of the high-voltage cable for the EMU described in this utility model is L-shaped, which can effectively deal with the arrangement of cables in the high-voltage jumper system of the EMU, and the protective shell can meet the salt spray test GB/T 2423.17-2009 ;After the L-shaped center conductor is matched with the stress cone, it meets the electrical performance requirements specified in GB/T 28427-2012 (AC withstand voltage 124kV*5min without flashover, no breakdown, impulse voltage ±250kV*10 times without breakdown, no Flashover);

3. The L-shaped connector and the center conductor of the present invention are arranged in a plug-in structure, which is easy to install and maintain; the compression fittings can provide external force to the stress cone, which can effectively ensure the surface pressure between the L-shaped center conductor and the stress cone within 30 years. of stability.

Description of drawings

Fig. 1 is the structural schematic diagram of the L-shaped connector of the high-voltage cable for the EMU described in Embodiment 1;

2 is a schematic diagram of the matching structure of the L-shaped central conductor and the L-shaped insulating sleeve according to the present invention;

Fig. 3 is the structural schematic diagram of the stress cone described in the utility model;

Fig. 4 is the structural representation of the compression fitting of the utility model;

Fig. 5 is the structural representation of the protection fitting of the utility model;

Among them: 1. L-shaped protective shell, 2. L-shaped center conductor, 3. L-shaped insulating sleeve, 4. Contact head, 5. Stress cone, 6. Compression fittings, 7. Protection fittings, 8. L-shaped cover plate , 9, the upper slope, 10, the lower slope.

Detailed ways

The present utility model will be further described below with reference to the embodiments and the accompanying drawings, but not limited thereto.

Example 1

As shown in Figure 1-5.

An L-shaped connector for a high-voltage cable for an EMU, comprising a protection unit and a pair of L-shaped joint units arranged in the protection unit; the pair of joint units are connected by an L-shaped connector, and the L-shaped connector includes The L-shaped central conductor 2 and the L-shaped insulating sleeve 3 are sleeved; the joint unit includes a contact head 4, a stress cone 5, a compression fitting 6 and a protective fitting 7 arranged in sequence; The end is provided with a groove matched with the contact head 4 and the stress cone 5;

One end of the contact head 4 is pluggably connected to the L-shaped central conductor 2, and the other end is connected to the cable; the stress cone 5 is a conical structure, and the two ends of the stress cone 5 are respectively provided with ends of the L-shaped central conductor 2. The groove and the upper slope 9 and the lower slope 10 of the compression fitting 6 are matched; the stress cone 5 is embedded in the groove at the end of the L-shaped central conductor 2 after being sleeved with the cable; the compression fitting 6 is a cylindrical structure, The inner side of one end of the compression fitting 6 is provided with a slope structure that matches the lower slope 10, and the other end is connected with a compression spring, and the other end of the compression spring acts on the protection fitting 7; the stress cone 5 is embedded in the L-shaped insulation Inside the casing 3;

The protection unit includes an L-shaped protection shell 1 and an L-shaped cover plate 8 matched with the L-shaped protection shell 1; both ends of the protection unit are open, and the joint unit is embedded in the opening provided at the end of the protection unit; protection The fittings 7 are sealedly connected to the opening at the end of the protection unit.

The material of the L-shaped central conductor 2 is aluminum alloy, and the surface is silver-plated; the material of the L-shaped insulating sleeve 3 is epoxy resin; the material of the stress cone 5 is EPDM rubber; the contact head 4 is aluminum alloy, the surface layer is silver-plated; the compression fittings 6 and the protective fittings 7 are made of aluminum alloy; the components of the L-shaped insulating sleeve 3 and the stress cone 5 are all added with inorganic flame retardants and organic flame retardants; the described The material of the protection unit is aluminum alloy, and the surface is silver-plated. The coating design can meet the salt spray test GB/T 2423.17-2009. The aluminum alloy is an Al-Cu-based alloy. The inorganic flame retardant is Al(OH) ₃ , and the organic flame retardant is bromine.

The length H of the L-shaped insulating sleeve is 370mm, and the diameter D is φ138mm.

Example 2

As described in the embodiment 1, the L-shaped connector for a high-voltage cable for an EMU, further, the L-shaped insulating sleeve 3 is composed of a long tube and a short tube. The insulating sleeve is short and long, which is easy to distinguish between installation units.

Example 3

The L-shaped connector for a high-voltage cable for an EMU described in Embodiment 1, further, the L-shaped insulating sleeve 3 is a cross-linked and cured molding structure, and the L-shaped central conductor 2 is embedded in the L-shaped insulating sleeve 3 . For traditional products with similar structure, due to the difficulty in controlling the adhesion between the insulating material used in the insulating sleeve and the metal material of the center conductor, the actual product is prone to peeling, air bubbles and other abnormalities that affect the electrical performance, and partial discharge occurs during use, which eventually leads to the aging of the insulating material. breakdown problem. And by increasing the bonding strength of the contact surface between the L-shaped central conductor 2 and the L-shaped insulating sleeve 3, anomalies such as peeling of the two materials and air bubbles are avoided.

The performance test table of the L-shaped connector described in this embodiment is shown in Table 1;

Table 1: Example 1 can test table

From the test data in Table 1, it can be known that the performance index of the L-shaped connector described in this embodiment meets the usage requirements in the field of rail transit.

Example 4

As in the L-shaped connector of the high-voltage cable for the EMU described in Embodiment 1, further, the groove at the end of the L-shaped central conductor 2 is provided with a strap contact finger reed socket structure. The contact head and the center conductor are connected by plug connection. By designing the strap structure in the inner cavity of the center conductor to conduct conduction with the contact head, the allowable requirements of large current can be achieved, and more than 30 times of plug-in installation can be achieved, which is convenient for product installation. and maintenance.

Claims (5)

1. A high-voltage cable L-shaped connector for an EMU is characterized in that, comprising a protection unit and a pair of L-shaped joint units arranged in the protection unit; a pair of joint units are connected by an L-shaped connector, so The L-shaped connector includes an L-shaped central conductor and an L-shaped insulating sleeve arranged in a sleeve; the joint unit includes a contact head, a stress cone, a compression fitting and a protective fitting arranged in sequence; both ends of the L-shaped central conductor There is a groove matched with the contact head and the stress cone; One end of the contact head is pluggably connected to the L-shaped center conductor, and the other end is connected to the cable; the stress cone is a conical structure, and the two ends of the stress cone are respectively provided with grooves, compression grooves and compression grooves with the ends of the L-shaped center conductors. The upper and lower slopes are matched with the fittings; the stress cone is inserted into the groove at the end of the L-shaped central conductor after being sleeved with the cable; the compression fitting is a cylindrical structure, and one end of the compression fitting is provided with a The other end of the inclined surface matched with the inclined surface is connected with the compression spring, and the other end of the compression spring acts on the protective hardware; the stress cone is embedded in the L-shaped insulating sleeve; The protection unit includes an L-shaped protection shell and an L-shaped cover plate matched with the L-shaped protection shell; the protection unit is open at both ends, and the joint unit is embedded in the opening at the end of the protection unit; protection hardware and protection The openings at the ends of the unit are sealed to connect. 2 . The L-shaped connector for a high-voltage cable for an EMU according to claim 1 , wherein the L-shaped insulating sleeve is composed of a long tube and a short tube. 3 . 3 . The L-shaped connector for a high-voltage cable for an EMU according to claim 1 , wherein the L-shaped insulating sleeve is a cross-linked and cured molding structure, and the L-shaped central conductor is embedded in the L-shaped insulating sleeve. 4 . 4 . The L-shaped connector for a high-voltage cable for an EMU according to claim 1 , wherein the groove at the end of the L-shaped central conductor is provided with a strap contact finger reed socket structure. 5 . 5 . The L-shaped connector for high-voltage cables for EMUs according to claim 1 , wherein the L-shaped insulating sleeve has a use-fit length H of 320±50 mm, and a diameter D of φ138 mm. 6 .

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