Transition wire clamp

Abstract

The transition wire clamp provided by the utility model can improve the connection strength and the drawing resistance between two materials of the transition wire clamp, and is safe and reliable. The transition wire clamp comprises a sleeve and a liner tube arranged in the sleeve, the sleeve is made of a first material, the liner tube is made of a second material, the outer wall of the liner tube and the inner wall of the sleeve are in contact with each other and are fixedly connected, a plurality of grooves are formed in the inner wall of the sleeve at intervals, a plurality of protrusions matched with the grooves are arranged on the outer wall of the liner tube, and the inner wall of the sleeve is made of a second material. And an included angle is formed between the extending direction of the groove and the axial direction of the sleeve. Preferably, the sleeve is made of copper, and the liner tube is made of aluminum. The liner tube is fixedly connected to the inner wall of the sleeve through a high-speed and high-pressure die-casting molten aluminum welding method; and the sleeve is integrally formed by cold extrusion forging of a T2 red copper rod. The transition wire clamp provided by the utility model has the characteristics of high mechanical strength, strong anti-drawing capability, high reliability and strong environment adaptation capability, and is not easy to heat and mechanically break in operation.

Description

Technical Field

[0001] The utility model relates to a transition wire clamp, in particular to a copper-aluminum transition wire clamp. Background Art

[0002] In the power system, a large amount of conductive materials are consumed. The terminal of many equipment is made of copper, while the overhead wire is mostly made of aluminum. Therefore, copper-aluminum transition clamps are needed to connect copper wires and aluminum wires. In the early stage, copper-aluminum transition clamps were generally composed of interconnecting copper plates and interconnecting aluminum plates welded to each other. The transition connection between copper wires and interconnecting copper plates and aluminum wires was achieved by connecting copper wires to interconnecting copper plates and connecting aluminum wires to interconnecting aluminum plates. The welding method between the interconnecting copper plates and the interconnecting aluminum plates is usually end face welding, and the welding joint area is small. When connected to high-voltage lines for use, the copper and aluminum connections of the copper-aluminum transition clamp will generate contact resistance, resulting in heat oxidation. When the heat oxidation reaches a certain degree, the welding joint surface is prone to heat and fracture. At the same time, the copper-aluminum transition clamp is also easily affected by external forces (such as cable tension) and fractured, resulting in short circuits and tripping during the operation of high-voltage lines, causing large-scale power outages. Chinese patent documents CN214625407U and CN114725699A disclose a transition wire clamp, which is composed of a wiring copper tube and a wiring aluminum column lined in the copper tube. One end of the wiring copper tube is a wiring section, and the other end is a transition section. The wiring aluminum column is located in the transition section. When in use, the copper wire is inserted into the wiring section, and the aluminum wire is inserted into the blind hole of the wiring aluminum column in the transition section to achieve a transition connection between the copper wire and the aluminum wire. This transition wire clamp is fixed by welding the inner wall of the copper tube and the outer wall of the aluminum column. Compared with the welding method of the end faces of the wiring copper plate and the wiring aluminum plate, the copper-aluminum contact area is increased, the connection strength is improved, it is not easy to break during use, and the operation stability is improved to a certain extent. Utility Model Content

[0003] In view of this, the utility model provides a new transition wire clamp, which further improves the connection strength and pull-out resistance between two materials, and is safe and reliable.

[0004] Specifically, the following technical solutions are included:

[0005] The utility model provides a transition line clamp, comprising a sleeve and a liner placed therein, the sleeve is made of a first material, the liner is made of a second material, the outer wall of the liner and the inner wall of the sleeve are in contact with each other and fixedly connected, the first material is different from the second material, a plurality of grooves are arranged on the inner wall of the sleeve at intervals, the outer wall of the liner has a plurality of protrusions matching the grooves, and an angle is formed between an extension direction of the grooves and an axial direction of the sleeve.

[0006] As a preferred solution, the groove has a smooth inner surface to avoid the defect of stress concentration; the width is 2-3mm and the depth is 0.5-0.7mm to obtain appropriate connection strength between the two materials, expand the contact area and improve the pull-out resistance. Specifically, the groove cross-section can be U-shaped or other shapes.

[0007] In order to obtain good connection strength between the two materials, improve the reliability of the transition clamp, and show good pull-out resistance in use, as mentioned above, the extension direction of the groove should not be set along the axial direction of the sleeve, and preferably, the groove extends along the circumferential direction of the inner wall of the sleeve. Obviously, the form of the groove can be flexible and diverse, it can be regular or special; it can be segmented or extend along the circumferential direction of the inner wall of the sleeve to form a closed ring.

[0008] The arrangement of the plurality of grooves on the inner wall of the sleeve can be determined according to actual needs. Preferably, the inner wall of the sleeve is provided with a plurality of grooves spaced apart along the axial direction.

[0009] The transition clamp described in the utility model can be applied to the existing copper-aluminum transition clamp in the prior art, and can also be applied to the transition clamp between other two different materials. As an improvement on the copper-aluminum transition clamp in the prior art, the material of the sleeve described in the utility model is copper, and the material of the liner is aluminum. The fixing method between the two materials can adopt a well-known and commonly used method. As a preferred embodiment, the liner is fixedly connected to the inner wall of the sleeve by a high-speed, high-pressure die-casting molten aluminum welding method; the sleeve is formed in one piece by cold extrusion forging of a T2 copper rod. The high-speed, high-pressure die-casting molten aluminum welding and the T2 copper rod cold extrusion forging one-piece forming method are both prior art, wherein the high-speed, high-pressure die-casting molten aluminum welding is to melt the metal aluminum material into a liquid state at high temperature, and then pour it into a die-casting machine, and the die-casting machine fills it into the mold cavity at high speed and high pressure, and solidifies it under high pressure to form a liner, and the liner is welded and fixed to the inner wall of the sleeve in this process.

[0010] The manufacturing method of the transition clamp of the utility model may include the following steps:

[0011] Step A, obtaining the sleeve having a plurality of grooves spaced apart on the inner wall;

[0012] Step B: forming the liner in the casing by a high-speed, high-pressure die-casting and fusion-welding integrated forming process.

[0013] Compared with the prior art, the beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0014] 1. The utility model provides a groove on the inner wall of the casing, so that the contact area between the casing and the liner is increased, so that a good connection strength is formed between the casing and the liner, and the wire clamp has a strong mechanical strength and improved pull-out resistance.

[0015] 2. The liner is formed into a tight and reliable connection with the casing by high-speed, high-pressure die-casting and fusion welding integrated molding technology. Not only does the liner material itself have good density and structural strength, but it can also avoid air retention and pore formation between the inner wall of the casing and the outer wall of the liner, thereby effectively reducing the connection resistance, improving the conductivity, and effectively avoiding the problem of transition surface corrosion of the copper-aluminum transition clamp during the use of high-voltage lines.

[0016] 3. When the sleeve is formed in one piece by cold extrusion forging of T2 copper rod, the density and structural strength of the material are effectively enhanced, and the conductive performance is improved.

[0017] In short, the transition wire clamp described in the utility model is used for the connection of power grid equipment, the connection between the wires of power equipment and the connection between the wires and the equipment, which solves the problem of easy damage and unreliable transition of copper-aluminum transition wire clamps in the past. It has the characteristics of high mechanical strength, strong pull-out resistance, high reliability, strong environmental adaptability, small connection resistance, good conductivity, and large current carrying capacity. It is not easy to generate heat and mechanically break during operation, which greatly reduces the problems of heat, breakage and transition corrosion of power grid equipment wire clamps during use. It has extremely high stability and effectively controls the occurrence of various accidents of varying sizes caused by heating, breakage and corrosion of such equipment wire clamps in the power grid, greatly improving the stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments 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 these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model. DETAILED DESCRIPTION

[0020] In order to make the technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] In the description of the present invention, it should be noted that the terms "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] It is important to note that the construction and arrangement of the present application shown in the embodiments are only exemplary, and those who refer to this disclosure should easily understand that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the elements shown as integrally formed can be composed of multiple parts or elements, the positions of the elements can be inverted or otherwise changed, and the properties or number or position of the discrete elements can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0024] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the present invention, or those features that are not relevant to the implementation of the present invention) may be described. Moreover, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0025] The utility model provides a new transition wire clamp, which further improves the connection strength and pull-out resistance between two materials and is safe and reliable.

[0026] As the prior art, Figure 1 The transition clamp shown has a wiring section at the bottom connected to the copper wire and a transition section at the top. The utility model makes improvements on the transition section.

[0027] like Figure 1 As shown, the transition clamp includes a casing 1 and a liner 2 placed therein, the casing 1 is made of a first material, the liner 2 is made of a second material, the outer wall of the liner 2 and the inner wall of the casing 1 are in contact with each other and fixedly connected, the first material is different from the second material, a plurality of grooves 3 are arranged on the inner wall of the casing 1 at intervals, the outer wall of the liner 2 has a plurality of protrusions matching the grooves 3, and an extension direction of the grooves 3 forms an angle with the axial direction of the casing 1.

[0028] Specifically, the groove 3 has a smooth inner surface to avoid the defect of stress concentration; a width of 2-3 mm and a depth of 0.5-0.7 mm to obtain appropriate connection strength between the two materials, improve the pull-out resistance, and expand the contact area. Figure 1 The cross section of the groove 3 is U-shaped. The groove 3 extends circumferentially along the inner wall of the sleeve 1 to form a closed ring. The inner wall of the sleeve 1 is provided with a plurality of grooves 3 along the axial direction.

[0029] In this embodiment, the material of the casing 1 is copper, and the material of the liner 2 is aluminum. The fixing method between the two materials can adopt a known and commonly used method. As a preferred embodiment, the liner 2 is fixedly connected to the inner wall of the casing 1 by a high-speed, high-pressure die-casting molten aluminum welding method; the casing 1 is formed in one piece by cold extrusion forging of a T2 copper rod.

[0030] The manufacturing method of the above transition clamp may include the following steps:

[0031] Step A: The sleeve 1 having a plurality of grooves 3 spaced apart on the inner wall is obtained by cold extrusion and forging of a T2 copper rod. Obviously, the lower wiring segment can be formed simultaneously during the integral forming in this step;

[0032] Step B: forming the liner 2 in the casing 1 at one time by high-speed, high-pressure die-casting and aluminum melting welding to obtain the transition clamp. No pores are found in the cross-section of the transition clamp.

[0033] It can be seen that the transition clamp obtained through the above steps not only has good density of the casing material and the liner material themselves, but also forms a close and reliable contact between the inner wall of the casing 1 and the outer wall of the liner 2, effectively avoiding the residual air. The cross-sectional morphology of the transition clamp obtained through experimental observation confirms that there are no pores on the contact surface between the inner wall of the casing 1 and the outer wall of the liner 2, thereby effectively improving the corrosion resistance of the transition surface.

[0034] As is known in the art, the end of the liner tube 2 may be provided with a blind hole for inserting and connecting an aluminum wire. The blind hole may be directly formed during high-speed, high-pressure die casting.

[0035] The above description is only for the purpose of facilitating the technical solution of the present invention to be understood by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transition clamp, comprising a sleeve and a liner disposed therein, wherein the sleeve is made of a first material, the liner is made of a second material, the outer wall of the liner and the inner wall of the sleeve are in close contact with each other and fixedly connected, the first material is different from the second material, and is characterized in that: The inner wall of the casing is provided with a plurality of grooves at intervals, the outer wall of the liner has a plurality of protrusions matching the grooves, and an angle is formed between the extending direction of the grooves and the axial direction of the casing.

2. The transition clamp according to claim 1, characterized in that: The groove has a smooth inner surface, a width of 2-3 mm, and a depth of 0.5-0.7 mm.

3. The transition clamp according to claim 1 or 2, characterized in that: The groove has a U-shaped cross section.

4. The transition clamp according to claim 1, characterized in that: The groove extends circumferentially along the inner wall of the sleeve.

5. The transition clamp according to claim 4, characterized in that: The groove extends circumferentially along the inner wall of the sleeve to form a closed ring.

6. The transition clamp according to claim 1, characterized in that: The inner wall of the sleeve is provided with a plurality of grooves at intervals along the axial direction.

7. The transition clamp according to claim 1, characterized in that: The material of the casing is copper, and the material of the liner is aluminum.

8. The transition clamp according to claim 7, characterized in that: The liner is fixedly connected to the inner wall of the casing by a high-speed, high-pressure die-casting molten aluminum welding method.

9. The transition clamp according to claim 7, characterized in that: The sleeve is formed in one piece by cold extrusion forging of T2 copper rod.

Images