阅读说明：本技术 一种铜铝一体化线夹及其制备方法 (Copper-aluminum integrated wire clamp and preparation method thereof ) 是由 林彩健 周永文 黄锦明 刘泽晖 刘建强 邱建勇 冯锦添 杨景斌 李伟风 钟杨柳 于 2020-12-15 设计创作，主要内容包括：本发明涉及线夹技术领域,更具体地,涉及一种铜铝一体化线夹,包括夹线部和连接部,夹线部与连接部焊接并形成焊接部,焊接部的外表面设置有密封层。密封层为金属涂层,金属涂层所用的金属为铜金属。通过在夹线部和连接部之间的铜铝焊接部增加一个密封层,使其与空气彻底隔绝,从源头杜绝铜铝金属间的原电池反应,满足配电网线路运行要求,有效减少重复检修次数,同时大大提高供电可靠性。(The invention relates to the technical field of wire clamps, in particular to a copper-aluminum integrated wire clamp which comprises a wire clamping part and a connecting part, wherein the wire clamping part and the connecting part are welded to form a welding part, and a sealing layer is arranged on the outer surface of the welding part. The sealing layer is a metal coating, and the metal used by the metal coating is copper metal. A sealing layer is added to the copper-aluminum welding part between the wire clamping part and the connecting part, so that the copper-aluminum welding part is thoroughly isolated from air, the galvanic cell reaction between copper and aluminum metals is avoided from the source, the running requirement of a power distribution network line is met, the repeated maintenance frequency is effectively reduced, and the power supply reliability is greatly improved.)

1. The utility model provides a copper aluminium integration fastener, includes wire clamping portion and connecting portion, its characterized in that: the wire clamping part and the connecting part are welded to form a welding part, and a sealing layer is arranged on the outer surface of the welding part.

2. The copper-aluminum integrated wire clamp according to claim 1, characterized in that: the sealing layer is a metal coating.

3. The copper-aluminum integrated wire clamp according to claim 2, characterized in that: the metal used for the metal coating is copper metal.

4. The copper-aluminum integrated wire clamp according to claim 2, characterized in that: the wire clamping part is internally provided with a wire clamp for clamping a wire, and the wire clamp is connected with the wire clamping part through a fastening assembly.

5. The copper-aluminum integrated wire clamp according to claim 4, characterized in that: the wire clamp comprises a wire clamp body, a fastening assembly and a wire clamping part, wherein a plurality of clamping grooves are formed in two sides of the wire clamp body, a mounting hole connected with the fastening assembly is formed in the center of the wire clamp body, and a fixing hole corresponding to the mounting hole is formed in the wire clamping part.

6. The copper-aluminum integrated wire clamp according to claim 5, characterized in that: the fastening assembly includes a bolt passing through the mounting hole and the fixing hole and a nut for fixing the bolt.

7. The copper-aluminum integrated wire clamp according to claim 5, characterized in that: the clamping groove is an arc groove.

8. A preparation method of the copper-aluminum integrated wire clamp is characterized by being used for preparing the copper-aluminum integrated wire clamp as claimed in claim 3, and comprising the following steps of:

the method comprises the following steps: welding the wire clamping part and the connecting part to form a welding part;

step two: polishing the welding part and removing welding slag;

step three: and spraying copper metal on the outer surface of the welding part to form a copper metal layer.

9. The method of claim 8, wherein: and in the second step, the welding part is ground flat, and polishing treatment is carried out after the grinding.

10. The method of claim 8, wherein: and in the third step, spraying copper powder on the outer surface of the welding part to form a compact copper metal layer.

Technical Field

The invention relates to the technical field of wire clamps, in particular to a copper-aluminum integrated wire clamp and a preparation method thereof.

Background

At present, the outlet terminals of common electrical equipment are classified into copper and aluminum, and the equipment wire clamp is used for connecting a bus down lead with the outlet terminals of the electrical equipment (such as a transformer, a breaker, a mutual inductor, a disconnecting switch, a wall bushing and the like). And the outgoing line is mostly the aluminium stranded conductor or steel-cored aluminium strand wires, so the terminal connector divide into two series of aluminium terminal connector and copper aluminium transition terminal connector. Copper connection points of copper among the power transformation equipment are connected by adopting copper, aluminum connection points are connected by adopting aluminum, and copper-aluminum transition equipment wire clamps are used between copper-aluminum connection points. The existing copper-aluminum transition equipment wire clamp welds a wire clamping part and a connecting part together, but because a gap is reserved on a welding seam at the welding position, moisture permeates into the gap in a contact surface under a humid environment to form electrolyte. The chemical activity of copper and aluminum is different, and a certain potential difference exists between the copper and the aluminum, under the action of electrolyte, a primary battery is formed, so that two metals of copper and aluminum are subjected to electrochemical reaction, the aluminum material is gradually oxidized and corroded, and a powdery oxide layer gradually appears on a contact surface, so that the contact resistance is increased, and the heating phenomenon is caused.

The Chinese patent publication with the publication number of 'CN 109193189A' and the publication date of 2019, 1 month and 11 days discloses a C-shaped equipment wire clamp, wherein copper and aluminum nodes are connected by adding a copper and aluminum composite plate, so that copper and aluminum do not need to be welded together by the wire clamp, and the problem of oxidation and heating is avoided.

Although the mode solves the problem of copper-aluminum electro-oxidation corrosion to a certain extent, compared with the original wire clamp, the method increases the installation procedure, and the copper-aluminum sheet composite plate is easy to lose in the transportation and installation process. More importantly, other products are additionally arranged between the equipment and the wire clamp, so that the direct contact area between the equipment and the wire clamp is reduced, and the contact resistance is physically increased.

Disclosure of Invention

The invention aims to solve the problem of oxidation and heating of a wire clamp of copper-aluminum transition equipment in the prior art, and provides a copper-aluminum integrated wire clamp which does not need to be additionally provided with a copper-aluminum composite plate and can also avoid oxidation and heating of a copper-aluminum welding part.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a copper aluminium integration fastener, includes wire clamping portion and connecting portion, wire clamping portion with connecting portion welding forms the welding part, the surface of welding part is provided with the sealing layer.

In foretell technical scheme, through setting up a sealing layer in the welding part, will press from both sides line portion and connecting portion weld joint seal up, thoroughly isolated with the air, stop the galvanic cell reaction between the copper aluminium metal from the source, avoid aluminium metal oxidation to generate heat.

Preferably, the sealing layer is a metal coating. The metal coating can not influence the electric conductivity of the wire clamp, the service life of the metal coating is longer, and the strength of a welding part can be increased.

Preferably, the metal used for the metal coating is copper metal. The copper metal has good conductivity, the strength of the sealing layer formed by the copper metal is greater than the stress generated by two materials due to different thermal expansion coefficients, and even if the expansion stress changes along with the temperature, the expansion stress is always within the bearing range of the strength of the sealing layer.

Preferably, a wire clamp for clamping a wire is arranged in the wire clamping part, and the wire clamp is connected with the wire clamping part through a fastening assembly. The wire clamp compresses the wire in the wire clamping portion, and then the fastening assembly completely fixes the wire clamp to the wire clamping portion, thereby fixing the wire.

Preferably, a plurality of clamping grooves are formed in two sides of the wire clamp, an installation hole connected with the fastening assembly is formed in the center of the wire clamp, and a fixing hole corresponding to the installation hole is formed in the wire clamping portion. The fastening assembly includes a bolt passing through the mounting hole and the fixing hole and a nut for fixing the bolt. The clamping groove fixes the wire, the bolt penetrates through the mounting hole and the fixing hole and then is in threaded connection with the nut, and the nut is screwed down, so that the wire clamp is close to the bottom of the wire clamping portion, and the wire is clamped.

Preferably, the clamping groove is an arc groove. The arc groove can be attached to the outer surface of the wire, and the clamping effect is better.

The preparation method of the copper-aluminum integrated wire clamp is used for preparing the power equipment wire clamp and comprises the following steps:

the method comprises the following steps: welding the wire clamping part and the connecting part to form a welding part;

step two: polishing the welding part and removing welding slag;

step three: and spraying copper metal on the outer surface of the welding part to form a copper metal layer.

Preferably, in the second step, the welded portion is ground flat, and after the grinding, a polishing process is performed. After the welding part is ground and polished, the surface of the welding part is more smooth and burrs on the surface are taken out, and the sealing effect of the copper metal layer is better when metal is sprayed.

Preferably, in the third step, copper powder is sprayed on the outer surface of the welded portion to form a dense copper metal layer. The fine copper powder can permeate into the welding line of the welding part, the welding line can be completely sealed, and the sealing effect is better.

Compared with the prior art, the invention has the beneficial effects that: a sealing layer is added to the copper-aluminum welding part between the wire clamping part and the connecting part, so that the copper-aluminum welding part is thoroughly isolated from air, the galvanic cell reaction between copper and aluminum metals is avoided from the source, the running requirement of a power distribution network line is met, the repeated maintenance frequency is effectively reduced, and the power supply reliability is greatly improved.

Drawings

FIG. 1 is a schematic structural view of a copper-aluminum integrated wire clamp of the present invention;

FIG. 2 is a schematic view of a clamping portion according to the present invention;

FIG. 3 is a cross-sectional view of a weld of the present invention;

FIG. 4 is a flow chart of a method for manufacturing the copper-aluminum integrated wire clamp of the invention.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Example 1

Fig. 1 to 3 show an embodiment of a copper-aluminum integrated wire clamp, which includes a wire clamping portion 1 and a connecting portion 2, wherein the wire clamping portion 1 is welded with the connecting portion 2 to form a welding portion 3, and a sealing layer 301 is disposed on an outer surface of the welding portion.

Wherein the sealing layer 301 is a metal coating. The metal coating can not influence the electric conductivity of the wire clamp, the service life of the metal coating is longer, and the strength of a welding part can be increased. Specifically, the metal used for the metal coating is copper metal. Copper metal has good electrical conductivity, and the strength of the sealing layer 301 made of copper metal is greater than the stress generated by two materials due to different thermal expansion coefficients, and even if the expansion stress changes with temperature, the expansion stress is always within the bearing range of the strength of the sealing layer 301.

In addition, a wire clamp 4 for clamping a wire is provided in the wire clamping portion 1, and the wire clamp 4 is connected to the wire clamping portion 1 by a fastening member 5. The wire clamp 4 presses the wire in the wire clamping portion 1, and then the fastening member 5 completely fixes the wire clamp 4 to the wire clamping portion 1, thereby fixing the wire.

Wherein, both sides of the wire clamp 4 are provided with a clamping groove 401, the center of the wire clamp 4 is provided with an installation hole 402 connected with the fastening component 5, and the wire clamping part 1 is provided with a fixing hole 101 corresponding to the installation hole 402. The fastening member 5 includes a bolt 501 passing through the mounting hole 402 and the fixing hole 101, and a nut 502 for fixing the bolt 501. The clamping groove 401 fixes the wire, the bolt 501 passes through the mounting hole 402 and the fixing hole 101 and then is in threaded connection with the nut 502, and the nut 502 is tightened to enable the wire clamp 4 to approach to the bottom of the wire clamping part 1, so that the wire is clamped.

Specifically, the clamping groove 401 is an arc groove. The arc groove can be attached to the outer surface of the wire, and the clamping effect is better.

The working process and working principle of the embodiment are as follows: through setting up a sealing layer 301 in the welding part play, will press from both sides line portion 1 and 2 welded joints of connecting portion seal up, thoroughly isolated with the air, stop the galvanic cell reaction of copper-aluminium intermetallic from the source, avoid aluminium metal oxidation to generate heat.

The beneficial effects of this embodiment: a sealing layer 301 is added to the copper-aluminum welding portion between the wire clamping portion 1 and the connecting portion 2, so that the sealing layer is thoroughly isolated from air, galvanic cell reaction between copper and aluminum metals is avoided from the source, the running requirement of a power distribution network line is met, repeated maintenance times are effectively reduced, and meanwhile power supply reliability is greatly improved.

Example 1

Fig. 4 is an embodiment of a method for manufacturing a copper-aluminum integrated wire clamp, which can be used for manufacturing the wire clamp of the power equipment in embodiment 1, and includes the following steps:

the method comprises the following steps: welding the wire clamping part 1 and the connecting part 2 to form a welding part;

step two: and grinding the welding part, removing welding slag, grinding the welding part, and polishing after grinding. After the welding part is ground and polished, the surface of the welding part is more smooth and burrs on the surface are taken out, and the sealing effect of the copper metal layer is better when metal is sprayed.

Step three: and spraying copper powder on the outer surface of the welding part to form a copper metal layer. The fine copper powder can permeate into the welding line of the welding part, the welding line can be completely sealed, and the sealing effect is better.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.