On-off elbow-type connector with fuse

Abstract

The utility model relates to an on-off elbow type connector with a fuse. The on-off elbow type connector comprises an upper conductive supporting pipe fitting, a lower conductive supporting pipe fitting, a high-voltage cable element and a conductive guide rod, an interference fit structure is arranged at the intersection of the lower end of the upper conductive supporting pipe fitting and the upper end of the lower conductive supporting pipe fitting. The interference fit structure comprises an upper aluminum alloy ring, a lower aluminum alloy ring and a screwing screw ring, during use, a precise interference fit structure is realized by finely adjusting the gap distance between the upper aluminum alloy ring and the lower aluminum alloy ring, and the upper conductive supporting pipe fitting and the lower conductive supporting pipe fitting are connected together through the interference fit structure. Therefore, the conductive guide rod can be arranged in a high-sealing-performance closed space formed by the upper conductive supporting pipe fitting and the lower conductive supporting pipe fitting. And the phenomena of discharge arc discharge and combustion in the connector caused by the falling force of the cable are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electrical auxiliary accessory technical field, especially especially a kind of elbow connector with fuse breaking for transformer in medium and high voltage. BACKGROUND

[0002] With the continuous progress and development of society, along with the continuous improvement of consumers' living standards, at the same time, also make all kinds of electrical equipment has increasingly popular to the consumer life. However, make a family or village or society to the power consumption is increasingly large, thereby, make the voltage equipment or transformer needed to provide large power for society, the current also increases with. The transformer is mainly used for changing the voltage of the voltage equipment, especially the medium and high voltage transformer plays a more obvious role in voltage equipment. The connector is an essential important component in medium and high voltage transformer. The connector used in the existing medium and high voltage transformer inside includes a sleeve shell, a sleeve lower shell mounted at the lower end of the sleeve shell, and a plug-in part sleeved in the sleeve shell and the sleeve lower shell. The connector is connected with the external cable. Due to the long-term suspension of the cable under the action of external force and its own gravity, the cable is easily subjected to a downward force, i.e. cable downward force. After a period of use, the cable downward force can easily cause the separation of the mating surface between the sleeve shell and the sleeve lower shell inside the connector connected to the cable, thereby causing the potential difference between the sleeve and the sleeve inside the connector under the live state, which forms discharge arc and burning phenomenon. SUMMARY

[0003] Therefore, the utility model provides a kind of elbow connector with fuse breaking to solve the technical problems that discharge arc and burning phenomenon occur in the connector inside caused by cable downward force.

[0004] To solve the above technical problems, the technical scheme of the utility model provides an elbow connector with fuse breaking, which includes an upper conductive support tube placed at the upper end, a lower conductive support tube mounted at the lower end of the upper conductive support tube, a high-voltage cable element mounted at the lower end of the lower conductive support tube, and a conductive guide rod mounted inside the upper and lower conductive support tubes. An interference fit structure is provided at the intersection of the lower end of the upper conductive support tube and the upper end of the lower conductive support tube to connect the upper and lower conductive support tubes together. The interference fit structure includes an upper aluminum alloy ring provided at the lower end of the upper conductive support tube, a lower aluminum alloy ring provided at the upper end of the lower conductive support tube, and a screw ring for reinforcing the upper and lower aluminum alloy rings together.

[0005] In use, the upper end surface of the lower aluminum alloy ring is sleeved on the lower end surface of the upper aluminum alloy ring, the inner ring receiving space on the lower aluminum alloy ring is sleeved on the outer periphery of the inner ring body on the upper aluminum alloy ring, and the upper end surface of the lower aluminum alloy ring and the outer ring body end surface of the upper aluminum alloy ring are in contact with each other; the screw ring is arranged between the upper end surface of the inner convex ring on the lower aluminum alloy ring and the lower end surface of the outer ring body on the upper aluminum alloy ring, and the threads inside the screw ring are respectively threadedly connected with the upper outer ring groove, the lower outer ring groove, and the ring-shaped convex body of the upper aluminum alloy ring, so as to finely adjust the gap distance between the upper aluminum alloy ring and the lower aluminum alloy ring, achieve precise interference fit, and enable the conductive guide rod to be arranged inside the closed space formed by the upper conductive support pipe and the lower conductive support pipe.

[0006] Further limited, the upper aluminum alloy ring comprises an upper ring body arranged on the upper conductive support pipe, an outer ring body arranged on the upper end of the upper ring body, an inner ring body arranged on the lower end of the upper ring body, an upper outer ring groove and a lower outer ring groove respectively arranged on the outer periphery of the inner ring body, and a ring-shaped convex body formed between the upper outer ring groove and the lower outer ring groove; an outer ring end surface is arranged at the intersection of the outer ring body and the inner ring body, and the outer ring end surface and the outer surface of the inner ring body form an outer ring receiving space;

[0007] The lower aluminum alloy ring comprises a lower ring body arranged on the upper end of the lower conductive support pipe, a lower ring sleeve body arranged on the outer periphery of the lower ring body, and an inner ring receiving space arranged on the upper end of the lower ring sleeve body for receiving the inner ring body, wherein the lower end of the inner ring receiving space is provided with an inner convex ring, and the upper end of the inner convex ring forms a screw ring groove for receiving the screw ring.

[0008] Further limited, the upper conductive support pipe comprises an insulating sleeve body, a transversely arranged load probe arranged inside the insulating sleeve body, and a probe adapter connected with the load probe and arranged inside the insulating sleeve; the insulating sleeve body is composed of a transverse pipe and a longitudinal pipe which are staggered to form a reverse L-shaped sleeve body; a conical probe receiving hole for receiving and fixing the load probe is arranged in the transverse sleeve body, and an upper guide rod receiving hole for receiving the conductive guide rod is arranged in the longitudinal sleeve body; the probe adapter is arranged at the intersection of the upper end of the upper guide rod receiving hole and the inner end of the probe receiving hole; a rib plate for increasing strength is arranged on the inner side of the transverse pipe and the longitudinal pipe at the position where they are perpendicularly intersected on the outer periphery of the sleeve body; a first small sleeve hole part is arranged on the upper side of the tail end of the transverse pipe, a tail part is arranged at the bottom position of the tail end of the transverse pipe, and a first test point part is arranged on the upper end of the outer periphery of the longitudinal pipe, which is arranged in parallel with the tail part; the upper aluminum alloy ring is arranged at the middle position of the longitudinal pipe and located at the lower end position of the first test point part.

[0009] Further limited, the lower conductive support tube is composed of an upper large lower small internal hollow insulating sleeve body; the lower end of the insulating sleeve body is provided with a lower aluminum alloy ring, one side of the lower end of the insulating sleeve body is provided with a second test point, and the other side of the lower end of the insulating sleeve body is provided with a second small sleeve hole; the upper end of the internal part of the insulating sleeve body is provided with a lower guide rod receiving hole for receiving the lower end part of the conductive guide rod, and the lower end of the internal part of the insulating sleeve body is provided with a cable receiving hole for the high-voltage cable element.

[0010] Further limited, the conductive guide rod comprises a solid circular cylindrical rod, a large connecting piece arranged on the upper end of the cylindrical rod, and a small connecting piece arranged on the lower end of the cylindrical rod.

[0011] Further limited, the high-voltage cable element comprises a thermal contraction tube rod, a semiconductor rod mounted on the upper end of the thermal contraction tube rod, a cable insulation layer rod mounted on the upper end of the semiconductor rod, and a copper conductor rod mounted on the upper end of the cable insulation layer rod; the thermal contraction tube rod, the semiconductor rod, the cable insulation layer rod, and the copper conductor rod are sequentially connected to form a composite rod from bottom to top.

[0012] The beneficial technical effects of the utility model are as follows: the upper end of the lower conductive support tube is provided with an interference fit structure at the intersection with the lower end of the upper conductive support tube; the interference fit structure comprises an upper aluminum alloy ring arranged on the lower end of the upper conductive support tube, a lower aluminum alloy ring arranged on the upper end of the lower conductive support tube, and a tightening screw ring for reinforcing the upper aluminum alloy ring and the lower aluminum alloy ring together.

[0013] In use, the upper end surface of the lower aluminum alloy ring is sleeved on the lower end surface of the upper aluminum alloy ring, the inner ring receiving space on the lower aluminum alloy ring is sleeved on the outer periphery of the inner ring body on the upper aluminum alloy ring, and the upper end surface of the lower aluminum alloy ring and the outer ring body end surface of the upper aluminum alloy ring are in contact with each other; the tightening screw ring is arranged between the inner convex ring upper end surface on the lower aluminum alloy ring and the outer ring body lower end surface on the upper aluminum alloy ring, the threads in the tightening screw ring are respectively threadedly connected with the upper outer ring groove, the lower outer ring groove, and the ring-shaped convex body of the upper aluminum alloy ring, the gap distance between the upper aluminum alloy ring and the lower aluminum alloy ring is adjusted, a precise interference fit structure is realized, the interference fit structure connects the upper conductive support tube and the lower conductive support tube together, the conductive guide rod can be placed in the high-sealing closed space formed by the upper conductive support tube and the lower conductive support tube. Fundamentally, the separation of the matching surface between the upper conductive support tube and the lower conductive support tube caused by the cable drop force is solved, the potential difference of the conductive support tube in the live state is avoided, the discharge arc and combustion accidents are avoided, and the discharge arc and combustion phenomenon caused by the cable drop force in the connector are avoided.

[0014] The technical scheme of the utility model will be described in further detail in combination with the drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation of an elbow connector with a fuse break in this utility model;

[0016] Figure 2 This is a schematic diagram of the upper conductive support tube in this utility model;

[0017] Figure 3 This is a schematic diagram of the lower conductive support tube of this utility model;

[0018] Figure 4 This is a schematic diagram of the conductive guide rod in this utility model;

[0019] Figure 5 This is a schematic diagram of the high-voltage cable components of this utility model;

[0020] Figure 6 for Figure 1 A magnified view of a section in direction A. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] Please refer to Figures 1 to 6 As shown in the figure, the following describes an elbow connector with a fuse break, which includes an upper conductive support tube 1, a lower conductive support tube 2, a conductive guide rod 3, and a high-voltage cable element 4.

[0023] The upper conductive support tube 1 comprises an insulating sleeve body, a transversely arranged load probe 101 installed inside the insulating sleeve body, and a probe adapter 102 connected with the load probe 101 and installed inside the insulating sleeve; the insulating sleeve body is formed in a reverse L-shaped sleeve body by interlacing a transverse tube and a longitudinal tube; a conical probe receiving hole 103 for receiving and fixing the load probe 101 is arranged in the transverse sleeve body, and an upper guide rod receiving hole 104 for receiving the conductive guide rod 3 is arranged in the longitudinal sleeve body; the probe adapter 102 is arranged at the intersection of the upper end of the upper guide rod receiving hole 104 and the inner end of the probe receiving hole 103; a rib plate 105 for increasing strength is arranged on the inner side of the transverse tube and the longitudinal tube at the position where they perpendicularly intersect on the periphery of the sleeve body; a first small sleeve hole 106 is arranged on the upper side of the tail end of the transverse tube, a tail part 107 is arranged at the bottom position of the tail end of the transverse tube, and a first test point 108 is arranged on the upper end of the periphery of the longitudinal tube, which is arranged in parallel with the tail part 107; an upper aluminum alloy ring 109 is arranged at the middle position of the longitudinal tube and located at the lower end position of the first test point 108.

[0024] The upper aluminum alloy ring 109 comprises an upper ring body arranged on the upper conductive support tube 1, an outer ring body 110 arranged on the upper end of the upper ring body, an inner ring body 111 arranged on the lower end of the upper ring body, an upper outer ring groove 112 and a lower outer ring groove 113 respectively arranged on the periphery of the inner ring body 111; a ring-shaped convex body 114 is formed between the upper outer ring groove 112 and the lower outer ring groove 113; an outer ring end face is arranged at the intersection of the outer ring body 110 and the inner ring body 111, and the outer ring end face and the outer surface of the inner ring body 111 form an outer ring receiving space 115.

[0025] The lower conductive support tube 2 is composed of an upper-large-and-lower-small insulating sleeve body with an internal hollow; a lower aluminum alloy ring 201 is arranged on the upper end of the insulating sleeve body, a second test point 202 is arranged on one side of the lower end of the insulating sleeve body, and a second small sleeve hole 203 is arranged on the other side of the lower end of the insulating sleeve body; a lower guide rod receiving hole 204 for receiving the lower end part of the conductive guide rod 3 is arranged at the upper end inside the insulating sleeve body, and a cable receiving hole 205 for the high-voltage cable element 4 is arranged at the lower end inside the insulating sleeve body.

[0026] The lower aluminum alloy ring 201 comprises a lower ring body arranged on the upper end of the lower conductive support tube 2, a lower ring sleeve body 206 arranged on the periphery of the lower ring body, an inner ring receiving space 207 arranged on the upper end of the lower ring sleeve body 206 for receiving the inner ring body 111, and an inner convex ring 208 arranged at the lower end of the inner ring receiving space 207, wherein a screw ring groove 209 for receiving a screw ring 5 is formed at the upper end of the inner convex ring 208.

[0027] The conductive guide rod 3 includes a solid round cylindrical rod 301, a large connector 302 arranged on the upper end of the cylindrical rod 301, and a small connector 303 arranged on the lower end of the cylindrical rod 301. The high-voltage cable element 4 includes a thermal-shrinkable tube rod 401, a semiconductor rod 402 mounted on the upper end of the thermal-shrinkable tube rod 401, a cable insulation layer rod 403 mounted on the upper end of the semiconductor rod 402, and a copper conductor rod 404 mounted on the upper end of the cable insulation layer rod 403. The thermal-shrinkable tube rod 401, the semiconductor rod 402, the cable insulation layer rod 403, and the copper conductor rod 404 are sequentially connected to form a composite rod from bottom to top.

[0028] During installation, the upper end of the lower conductive support tube 2 is sleeved on the lower end of the upper conductive support tube 1, the upper end portion of the conductive guide rod 3 is installed inside the upper guide rod receiving hole 104 of the upper conductive support tube 1, and the lower end portion of the conductive guide rod 3 is installed inside the lower guide rod receiving hole 204 of the lower conductive support tube 2. The load probe 101 is installed inside the probe receiving hole 103 of the upper conductive support tube 1, the inner side end of the load probe 101 and the upper end portion of the conductive guide rod 3 are connected through the probe adapter 102, and the large connector 302 arranged on the upper end of the conductive guide rod 3 is connected. The small connector 301 arranged on the lower end of the conductive guide rod 3 is connected with the upper end portion of the high-voltage cable element 4. The high-voltage cable element 4 is installed inside the cable receiving hole 205 inside the lower end of the lower conductive support tube 2.

[0029] An interference fit structure is installed at the intersection of the lower end of the upper conductive support tube 1 and the upper end of the lower conductive support tube 2. The interference fit structure includes an upper aluminum alloy ring 109 arranged on the lower end of the upper conductive support tube 1, a lower aluminum alloy ring 201 arranged on the upper end of the lower conductive support tube 2, and a screw ring 5 for reinforcing the upper aluminum alloy ring 201 and the lower aluminum alloy ring 109 together.

[0030] In use, the upper end surface of the lower aluminum alloy ring 109 is sleeved on the lower end surface of the upper aluminum alloy ring 201, the inner ring on the lower aluminum alloy ring 109 is sleeved on the outer periphery of the inner ring body 111 on the upper aluminum alloy ring 201, and the upper end surface of the lower aluminum alloy ring 109 is in contact with the end surface of the outer ring body 110 of the upper aluminum alloy ring 201; the screw ring 5 is arranged between the upper end surface of the inner convex ring 208 on the lower aluminum alloy ring 109 and the lower end surface of the outer ring body 110 on the upper aluminum alloy ring 201, and the threads inside the screw ring 5 are respectively threadedly matched with the upper outer ring groove 112, the lower outer ring groove 113, and the ring-shaped convex body 114 of the upper aluminum alloy ring 201, so as to finely adjust the gap distance between the upper aluminum alloy ring 201 and the lower aluminum alloy ring 109 and realize a precise interference fit structure. The interference fit structure connects the upper conductive support pipe 1 and the lower conductive support pipe 2 together, so that the conductive guide rod 3 can be arranged inside the high-sealing closed space formed by the upper conductive support pipe 1 and the lower conductive support pipe 2. Fundamentally, the separation of the fitting surface between the upper conductive support pipe 1 and the lower conductive support pipe 2 caused by the cable drop force is solved, so that the potential difference of the conductive support pipe under the electrified state is caused, so that the discharge arc and combustion accidents cannot be formed, thereby avoiding the discharge arc and combustion phenomenon caused by the cable drop force in the connector.

[0031] The elbow connector with a fuse opening described in the case has a full shielding and full insulation opening and full range current limiting fuse protection function, which is used in a 15kv / 25kv / 35kV voltage power supply, and belongs to a 200A level, 15kv to 35kV voltage level instantaneous opening device. The connector described in the case provides a convenient and economical device protection current limiting fuse protection method for an underground power distribution system. The design scheme of the connector in the case is to use an insulating operating rod to operate a switch device. The connector described in the case is tested according to the international electrical IEEE 386-2016 standard under the maximum fuse capacity rated value, fully meets the requirements of full sealing, full waterproof safety and live operation in harsh environments. The elbow connector with a fuse opening described in the case is a full-automatic one-time forming by post-injection, and the product is made of high-quality EPDM high-performance thermosetting.

[0032] The EPDM rubber used in the upper conductive support sleeve and the lower conductive support sleeve described in the case is strictly controlled in the production process. The standard functions include an arc-extinguishing flame-retardant conductive insert and a double-headed threaded high-conductive metal body.

[0033] The elbow connector described in the case is mainly characterized by having an anti-oxidation aluminum alloy ring, and the insulating parts of the upper and lower conductive support sleeves 1 and 2 are in interference fit to achieve no discharge under high voltage and sealing, and the built-in screw is tightened by the misalignment of the upper and lower aluminum alloy rings. The product meets all applicable ranges of cables used for connecting transformer equipment.

[0034] The preferred embodiments of the present application are described above with reference to the drawings, and the scope of the present application is not limited thereto. Any modification, equivalent replacement and improvement made by those skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. A fused disconnect elbow connector comprising an upper conductive support tube member disposed at an upper end, a lower conductive support tube member mounted at a lower end of the upper conductive support tube member, a high voltage cable element mounted at a lower end of the lower conductive support tube member, and a conductive guide rod mounted within the upper conductive support tube member and the lower conductive support tube member; characterized in that: The upper end of the upper conductive support pipe and the lower end of the lower conductive support pipe are connected by an interference fit structure; the interference fit structure includes an upper aluminum alloy ring arranged on the lower end of the upper conductive support pipe, a lower aluminum alloy ring arranged on the upper end of the lower conductive support pipe, and a screw ring used for reinforcing the upper aluminum alloy ring and the lower aluminum alloy ring. In use, the upper end surface of the lower aluminum alloy ring is sleeved on the lower end surface of the upper aluminum alloy ring, the inner ring receiving space on the lower aluminum alloy ring is sleeved on the outer periphery of the inner ring body on the upper aluminum alloy ring, and the upper end surface of the lower aluminum alloy ring and the outer ring body end surface of the upper aluminum alloy ring are in contact with each other; the screw ring is arranged between the upper end surface of the inner convex ring on the lower aluminum alloy ring and the lower end surface of the outer ring body on the upper aluminum alloy ring, the threads inside the screw ring are respectively threadedly connected with the upper outer ring groove, the lower outer ring groove, and the ring-shaped convex body of the upper aluminum alloy ring, the gap distance between the upper aluminum alloy ring and the lower aluminum alloy ring is adjusted, precise interference fit is achieved, and the conductive guide rod can be arranged in the closed space formed by the upper conductive support pipe and the lower conductive support pipe.

2. An elbow connector with a fuse according to claim 1, characterized in that: The upper aluminum alloy ring includes an upper ring body arranged on the upper conductive support pipe, an outer ring body arranged on the upper end of the upper ring body, an inner ring body arranged on the lower end of the upper ring body, an upper outer ring groove and a lower outer ring groove arranged on the outer periphery of the inner ring body, and a ring-shaped convex body formed between the upper outer ring groove and the lower outer ring groove; the outer ring end surface is arranged at the intersection of the outer ring body and the inner ring body, and the outer ring end surface and the outer surface of the inner ring body form an outer ring receiving space. The lower aluminum alloy ring includes a lower ring body arranged on the upper end of the lower conductive support pipe, a lower ring sleeve body arranged on the outer periphery of the lower ring body, and an inner ring receiving space arranged on the upper end of the lower ring sleeve body for receiving the inner ring body; the inner ring receiving space is provided with an inner convex ring at the lower end, and the upper end of the inner convex ring is provided with a screw ring groove for receiving the screw ring.

3. An elbow connector with a fuse according to claim 1, characterized in that: The upper conductive support pipe includes an insulating sleeve body, a transversely arranged load probe arranged inside the insulating sleeve body, and a probe adapter connected with the load probe; the insulating sleeve body is a sleeve body formed by interlacing a transverse pipe and a longitudinal pipe into an inverted L shape; a tapered probe receiving hole for receiving and fixing the load probe is arranged in the transverse sleeve body, and an upper guide rod receiving hole for receiving the conductive guide rod is arranged in the longitudinal sleeve body; the probe adapter is arranged at the intersection of the upper end of the upper guide rod receiving hole and the inner end of the probe receiving hole; a rib plate for increasing strength is arranged on the inner side of the transverse pipe and the longitudinal pipe at the position where they perpendicularly intersect on the outer periphery of the sleeve body; a first small sleeve hole part is arranged on the upper side of the tail end of the transverse pipe, a tail part is arranged at the bottom position of the tail end of the transverse pipe, and a first test point part is arranged on the upper end of the outer periphery of the longitudinal pipe; the upper aluminum alloy ring is arranged at the middle position of the longitudinal pipe and located at the lower end position of the first test point part.

4. The fused disconnect elbow connector of claim 1, wherein: The lower conductive support pipe is composed of an upper large and lower small hollow insulation sleeve body; the lower end of the insulation sleeve body is provided with a lower aluminum alloy ring, one side of the lower end of the insulation sleeve body is provided with a second test point, and the other side of the lower end of the insulation sleeve body is provided with a second small sleeve hole; the upper end of the inside of the insulation sleeve body is provided with a lower guide rod receiving hole for receiving the lower end of the conductive guide rod, and the lower end of the inside of the insulation sleeve body is provided with a cable receiving hole for the high-voltage cable element.

5. The fused open elbow connector of claim 1, wherein: The conductive guide rod comprises a solid circular cylindrical rod, a large connecting piece arranged on the upper end of the cylindrical rod, and a small connecting piece arranged on the lower end of the cylindrical rod.

6. The fused open elbow connector of claim 1, wherein: The high-voltage cable element comprises a thermal cold shrink tube rod, a semiconductor rod mounted on the upper end of the thermal cold shrink tube rod, a cable insulation layer rod mounted on the upper end of the semiconductor rod, and a copper conductor rod mounted on the upper end of the cable insulation layer rod; the thermal cold shrink tube rod, the semiconductor rod, the cable insulation layer rod, and the copper conductor rod are sequentially connected to form a composite rod from bottom to top.

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