New traction outgoing mode terminal

Abstract

A traction outgoing mode terminal, comprising, sequentially from top to bottom, an external connector lug (1), a conductive rod (2), a locking nut (3), a compression ring (4), a washer (5), an upper insulating member (6) and a lower insulating member (7), the upper insulating member being located outside a transformer box body, the lower insulating member being located inside the transformer box body, a sealing gasket being provided between the upper insulating member and the transformer box body and a sealing gasket being provided between the lower insulating member and the transformer box body, and a sealing gasket also being provided at either end of the washer, wherein the upper insulating member and the lower insulating member are both cast with epoxy resin, and the lower insulating member is provided with an oil through hole. By means of using epoxy resin casting instead of a ceramic material, the present application reduces the size and weight of an insulator, optimizes an umbrella skirt structure, and improves the design of the conductive rod, thereby realizing a lightweight and miniaturized design of the terminal.

Description

A new type of traction terminal

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 19, 2023, with application number 202311756028.3 and invention name “A new type of traction output terminal”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of traction transformers, and in particular to a new type of traction line-out terminal. Background Art

[0003] A traction transformer is an electric energy conversion device that uses the principle of electromagnetic induction to convert AC power of one voltage and current into power of another voltage and current of the same frequency. The transformer body is installed in a transformer tank filled with cooling medium and is sealed by the tank cover and the tank. Externally, the high-voltage side / traction side electrical connections are usually made through the high-voltage A terminal / traction porcelain bottle terminal.

[0004] As electrical connection components, traction transformer traction terminals are responsible for connecting the transformer to external cables. Their electrical and mechanical properties are crucial. Currently, porcelain bottle terminals are commonly used for transformer traction terminals. To meet these electrical and mechanical performance requirements, the insulation is made of ceramic. The porcelain sleeve is large and heavy, the conductive rod is made of brass, and the external terminal block is tin-plated for corrosion protection, making it heavy. To ensure sealing performance, the entire porcelain sleeve is assembled into two parts, upper and lower, with multiple sealing gaskets forming a sealed structure. The structure of the porcelain bottle terminal is shown in Figure 1 below, including an upper porcelain sleeve, located outside the transformer housing, to ensure external insulation of the terminal; a lower porcelain sleeve, located inside the transformer housing, to ensure internal insulation; and a copper conductive rod for electrical connection. The assembled terminal is bulky, approximately 370mm tall and weighing approximately 7.5kg.

[0005] Therefore, how to achieve small size and light weight of the original terminal is a technical problem that needs to be solved urgently by those skilled in the art.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a new type of traction outlet terminal, which uses epoxy resin casting instead of ceramic material to reduce the volume and weight of the insulator, optimize the umbrella skirt structure, and improve the conductive rod design, thereby realizing the lightweight and miniaturized design of the terminal.

[0008] The technical solutions provided by the present invention are as follows:

[0009] A new type of traction terminal includes, from top to bottom, an external terminal head, a conductive rod, a locking nut, a pressure ring, a washer, an upper insulating part, and a lower insulating part. The upper insulating part is located outside the transformer box, and the lower insulating part is located inside the transformer box. The upper and lower insulating parts are both cast with epoxy resin, and the lower insulating part is provided with an oil hole.

[0010] Preferably, the density of the upper insulating member and the lower insulating member are both 1.8 to 2.2 g / cm 3 .

[0011] Preferably, an shed structure is provided on the outer surface of the upper insulating member, and the shed structure is composed of a plurality of sheds of equal diameter arranged in an array, with the intervals between the sheds being the same.

[0012] Preferably, the umbrellas in the umbrella skirt structure extend 8 to 10 mm from the main structure, the umbrella skirts are spaced 8 to 12 mm apart, and the number of umbrella skirts is 2 to 6.

[0013] Preferably, the height of the upper insulating member is 50-60 mm.

[0014] Preferably, the height of the lower insulating member is 50-55 mm.

[0015] Preferably, the diameter of the conductive rod is 24-27 mm.

[0016] Preferably, an oil hole is provided in the middle of the conductive rod, an oil groove is provided on the surface of the conductive rod, and the oil hole is connected to the oil groove.

[0017] Preferably, sealing gaskets are provided between the upper insulating member, the lower insulating member and the transformer box.

[0018] Preferably, both ends of the gasket are also provided with sealing pads.

[0019] This application has the following advantages over the prior art:

[0020] The new traction outlet terminal of the present application replaces the porcelain sleeve structure by using epoxy resin cast insulators (upper insulator, lower insulator), while reducing the diameter of the conductive rod and providing an oil groove on the conductive rod to ensure that the temperature rise is maintained below the limit while increasing the current density, thereby improving the reliability of electrical connection and mechanical performance, greatly reducing the weight and volume of the terminal, and realizing the lightweight design of the traction transformer; at the same time, the epoxy resin terminal has excellent environmental tolerance and good resistance to high and low temperature alternation, and can work for a long time under high temperature and high humidity conditions. The present application can not only be used for the design of traction outlet terminals of rail traction transformers, but can also be applied to transformers in other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a schematic structural diagram of an existing porcelain bottle terminal;

[0023] FIG2 is a schematic structural diagram of a new type of traction outlet terminal in an embodiment of the present invention.

[0024] Reference numerals: 1. External terminal; 2. Conductive rod; 3. Locking nut; 4. Pressure ring; 5. Washer; 6. Upper insulating member; 61. Umbrella skirt structure; 7. Lower insulating member; 8. Transformer box; 9. Sealing gasket. DETAILED DESCRIPTION

[0025] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0026] As shown in Figure 2, the embodiment of the present invention provides a new type of traction outlet terminal, which includes, from top to bottom, an external terminal head 1, a conductive rod 2, a locking nut 3, a pressure ring 4, a washer 5, an upper insulating member 6, and a lower insulating member 7. The upper insulating member 6 is located outside the transformer box 8, and the lower insulating member 7 is located inside the transformer box 8. A sealing gasket 9 is provided between the upper insulating member 6, the lower insulating member 7 and the transformer box 8. A sealing gasket 9 is also provided at both ends of the washer 5. The upper insulating member 6 and the lower insulating member 7 are both cast with epoxy resin. By using the upper insulating member 6 and the lower insulating member 7 cast with epoxy resin to replace the existing porcelain sleeve structure, the conductive member 6 is optimized. The structural design of rod 2 ensures the reliability of electrical connection and mechanical performance, greatly reduces the weight and volume of the terminal, and realizes the lightweight design of traction transformer. At the same time, the epoxy resin terminal has excellent environmental tolerance, and its temperature resistance can reach -40℃~140℃, and its electrical strength is 31kV / mm, which is 1.5 times that of ceramic material, and its electrical performance is better. After using epoxy resin instead of ceramic material, the thickness of the insulator can be thinned while ensuring the unchanged electrical performance, realizing the miniaturization design of the product. An oil hole is opened on the lower insulating part 7 to ensure that the transformer oil can smoothly enter the gap between the conductive rod 2 and the insulating component and allow the air to be discharged smoothly.

[0027] In this embodiment, the density of the upper insulating member 6 and the lower insulating member 7 are both 1.8-2.2 g / cm3, which is only half of that of the ceramic material. Under the same volume, the weight of epoxy resin is much smaller than that of ceramic material, thereby realizing a lightweight design of the traction terminal.

[0028] In this embodiment, the outer surface of the upper insulator 6 is provided with a shed structure 61. This shed structure 61 is composed of several sheds of equal diameter, spaced evenly apart. The sheds in the shed structure 61 extend 8 to 10 mm beyond the main structure, are spaced 8 to 12 mm apart, and are provided in a range of 2 to 6 sheds. By using epoxy resin for the upper and lower insulators 6 and 7, the shed structure 61 is optimized, with the shed edge dimensions shortened and the number of sheds increased to maintain electrical performance, all while ensuring external creepage distance and minimum electrical spacing. This reduces the length of the air-side and oil-side insulators, thereby reducing the product volume. This reduces the size of the transformer housing 8 and the protective cover, achieving an overall lightweight and compact transformer design.

[0029] In this embodiment, the height of the upper insulating member 6 is 50-60 mm. The height of the lower insulating member 7 is 50-55 mm. The weight of the epoxy resin-cast terminal in this embodiment is reduced to two-thirds of the weight of the porcelain bottle terminal. The overall height of the terminal is significantly lower than that of existing terminals (the height of the terminal can be reduced by 50 mm), which greatly reduces the weight of the transformer, facilitating its lightweight design. It also reduces the overall length of the transformer, facilitating its miniaturized design.

[0030] In this embodiment, the diameter of the conductive rod 2 is 24-27 mm. This diameter is significantly smaller than that of conventional conductive rods (typically 30 mm), which helps increase current density and optimizes the structure of the conductive rod 2, reducing weight and volume. The conductive rod 2 is fabricated from copper rods. A blind oil hole is provided in the center of the conductive rod 2, and an oil groove is provided on the surface of the conductive rod 2. The oil hole communicates with the oil groove, increasing the flow space for transformer oil and improving cooling. This ensures that the temperature rise of the terminal metal portion remains within the traction transformer temperature rise limit while reducing the weight of the conductive rod 2.

[0031] In this embodiment, the lock nut 3, pressure ring 4, and washer 5 are all made of brass and are used to seal and secure the transformer housing. The external terminal block 1 is made of tinned copper and is electrically connected to the conductive rod 2 via threads. The sealing gasket 9 used in this embodiment is an insulating, oil-resistant rubber component and is used to provide an integral oil seal for the traction terminal.

[0032] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A new type of traction lead-out terminal, which sequentially includes an external connection head (1), a conductive rod (2), a locking nut (3), a pressure ring (4), a washer (5), an upper insulating member (6), and a lower insulating member (7) from top to bottom. The upper insulating member (6) is located outside the transformer tank (8), and the lower insulating member (7) is located inside the transformer tank (8). It is characterized in that, The upper insulating part (6) and the lower insulating part (7) are both made by epoxy resin casting, and an oil through-hole is formed on the lower insulating part (7).

2. The novel traction lead-out type terminal according to claim 1, wherein, The densities of the upper insulating part (6) and the lower insulating part (7) are both 1.8 - 2.2 g / cm3.

3. The novel traction lead-out type terminal according to claim 1, characterized in that, An umbrella skirt structure (61) is provided on the outer surface of the upper insulating part (6), and the umbrella skirt structure (61) is composed of several umbrella skirts with equal diameters arranged, and the intervals between the umbrella skirts are the same.

4. The novel traction lead-out type terminal according to claim 3, wherein, In the umbrella skirt structure (61), the umbrellas protrude 8 - 10 mm from the main structure, the intervals between the umbrella skirts are 8 - 12 mm, and the number of umbrella skirts is set to 2 - 6.

5. The novel traction outgoing line type terminal according to claim 1, wherein, The height of the upper insulating part (6) is 50 - 60 mm.

6. The novel traction lead-out type terminal according to claim 1, characterized in that, The height of the lower insulating part (7) is 50 - 55 mm.

7. The novel traction lead-out type terminal according to any one of claims 1-6, characterized in that, The diameter of the conductive rod (2) is 24 - 27 mm.

8. The novel traction lead-out type terminal according to any one of claims 1-6, characterized in that, An oil through-hole is provided in the middle of the conductive rod (2), and an oil through-groove is provided on the surface of the conductive rod (2), and the oil through-hole is communicated with the oil through-groove.

9. The novel traction lead-out type terminal according to any one of claims 1-6, characterized in that, Sealing gaskets (9) are provided between the upper insulating part (6), the lower insulating part (7) and the transformer tank body (8).

10. The novel traction lead-out type terminal according to claim 9, characterized in that, Sealing gaskets (9) are also provided at both ends of the washer (5).

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