CN114336098B - Copper-aluminum transition junction box of switch before table - Google Patents

Abstract

The invention discloses a copper-aluminum transition junction box for a switch in front of a meter, which includes a reinforced insulating case, a connecting bolt, a connecting nut and a connecting piece, the reinforced insulating case includes an upper case and a lower case, and one end of the connecting bolt passes through the After passing through the lower shell and the upper shell, it is connected with the connecting nut, and the other end of the connecting bolt presses the lower shell, and the upper shell and/or the lower shell are fixed with a puncture blade, and the puncture blade is arranged on the upper shell and the lower shell Between the bodies, the connecting piece includes a copper end made of copper and an aluminum end made of aluminum, the aluminum end of the connecting piece is connected with the piercing blade, and the copper end of the connecting piece extends out of the reinforced insulating shell. The invention provides a copper-aluminum transition junction box for the front switch of the meter box, which can solve the problem of easy burning of the copper-aluminum joints caused by the different materials of the settlement wire (aluminum) and the terminal (copper) of the front switch of the user's meter box. .

Description

A copper-aluminum transition junction box for front switches

technical field

The invention relates to the technical field of power equipment maintenance tools, in particular to a copper-aluminum transition junction box for a switch in front of a meter.

Background technique

At the connection of the meter connection or the terminal of the user's electricity transmission, the connection is generally fixed by the connection screw, and the connection screw is very easy to cause the wire to be broken or the wire to be worn, which will cause the current to over-current, and even burn the meter and burn the wire. Such problems reduce the application life of metering, increase the cost of production and maintenance, and also lead to the problem of low reliability of power supply for users; at the same time, when the wires are mostly made of aluminum, the humidity in the external environment is high or in rainy days , When the surrounding is relatively humid, it will also cause problems such as copper-aluminum connection oxidation, and it will also cause many line failures such as burning meters and wires. Copper and aluminum are two main materials for electric energy transmission, and their potentials are different. When copper and aluminum are in direct contact, the gap between the copper and aluminum contact surfaces will cause the contact surface of copper and aluminum to be exposed to air, moisture , carbon dioxide and other impurities, the contact surface of copper and aluminum is very easy to form an electrolyte under the action of these impurities, thus forming a primary battery with aluminum as the negative electrode and copper as the positive electrode. This primary battery reaction causes aluminum to galvanically corrode. Accelerate the oxidation of the aluminum wire, resulting in an increase in the contact resistance at the joint between copper and aluminum; in addition, the elastic modulus and thermal expansion coefficient of the two are also very different. When the copper and aluminum are in direct contact, after many times in operation After the cold and heat cycle (such as power on and off), there will be a large gap at the contact point, which will affect the contact and increase the contact resistance.

In the prior art, to connect the copper wire and the aluminum wire together, generally a copper-aluminum transition terminal is installed, and the copper-aluminum transition terminal can tightly crimp the copper and aluminum together, so that the metal copper and the metal aluminum If there is no gap between them, it cannot be in contact with the electrolyte and the water in the air. This method can completely prevent electrochemical corrosion. When it is applied in the front switch of the user's meter box, first use hydraulic tools to crimp the settled wire (aluminum wire) to the aluminum part of the copper-aluminum transition terminal, make it fully contact and completely isolate the electrolyte and air, and then connect the copper wire The column part is in full contact with the copper terminal of the air switch in the user's meter box, and then tighten the terminal screws on the air switch to ensure that the two copper terminals are in full contact. Copper-aluminum transition terminals are used to solve the problem of easy burning at the joints caused by the different materials of the settlement wire (aluminum) and the terminal (copper) of the front switch of the user's meter box. The disadvantages are also obvious: 1. Use copper In the process of aluminum transition terminals, the operator needs to operate the crimping tool to crimp one end of the copper-aluminum terminal, which requires that the power-off operation must be performed when using the copper-aluminum terminal, otherwise it will directly endanger the lives of the workers on site. Safety. 2. The operation of copper-aluminum transition terminals is complicated in the actual use process, which is not only time-consuming and labor-intensive, but also has slightly higher requirements for the crimping process. Careless operation may cause the following hidden dangers: 1. The stripping of insulated wires does not use special electric stripping Tools, manual stripping lead to damage to the aluminum wire, and even wire breakage after bending, resulting in hidden dangers of heating. 2. Improper handling of the contact surface. During the construction process, the burrs on the contact surface were not treated, and the conductive paste was not evenly applied before installation (which can improve the conductivity and alleviate the electrical corrosion caused by the lap joint of copper and aluminum), resulting in a decrease in the effective contact area and an increase in the contact resistance. hotspot. 3. When crimping the wire, the wire is not inserted into the bottom of the aluminum conductive tube of the copper-aluminum transition terminal, which reduces the contact area and the carrying capacity. 4. The crimping mold of the corresponding size is not used for crimping. The crimping mold must be used to crimp the aluminum end of the copper-aluminum transition terminal and the wire when installing the compression type equipment clamp. The crimping process should meet the requirements of the contact resistance. Regulation. If the size of the mold is too large, it will cause poor contact between the wire and the clamp terminal, increase the contact resistance, and generate heat. Therefore, it is necessary to design a copper-aluminum transition junction box for the front switch of the meter box to solve the problem of easy burning at the copper-aluminum joint of the front switch of the user's meter box due to the different materials of the landing wire (aluminum) and the terminal (copper). .

Contents of the invention

The purpose of the present invention is to solve the problem that the copper-aluminum joint is easy to be burned due to the different materials of the settlement wire (aluminum) and the terminal (copper) of the front switch of the user's meter box.

In order to achieve the above object, the present invention adopts the following technical solutions:

A copper-aluminum transition junction box for a switch in front of a meter, including a reinforced insulating case, a connecting bolt, a connecting nut and a connecting piece, the reinforced insulating case includes an upper case and a lower case, and one end of the connecting bolt passes through the lower case in turn After being connected with the upper shell, the connecting nut is connected, and the other end of the connecting bolt is pressed against the lower shell, and a puncture blade is fixed on the upper shell and/or the lower shell, and the puncture blade is arranged between the upper shell and the lower shell. The connecting piece includes a copper end made of copper and an aluminum end made of aluminum, the aluminum end of the connecting piece is connected with the piercing blade, and the copper end of the connecting piece extends out of the reinforced insulating shell.

In the above technical solution, the reinforced insulating shell plays the role of insulation protection. The piercing blade utilizes its stabbed structure, when pressure is applied to the piercing blade, the piercing blade can pierce the insulation layer of the aluminum wire, and the piercing blade is in full contact with the aluminum conductor. The connecting piece acts as a copper-aluminum transition, and is used to connect the aluminum wire and the copper terminal of the open circuit without loss. The specific operation and working principle of the above-mentioned technical scheme: extend the settlement line (that is, the aluminum wire) into the copper-aluminum transition junction box, and then slightly twist the connecting bolts to fix the position of the settlement line (ensure that the settlement line extends to the required depth and no longer loose). Tighten the connecting nut with a socket wrench. During the process, the connecting nut is exerted a torque, and the "teeth" on the piercing blade will pierce the cable insulation layer and come into contact with the settled wire to realize piercing and electrification. When the torque reaches the set value, use a screwdriver to connect the copper end of the connecting piece to the open copper terminal. The above technical solution integrates the functions of the copper-aluminum transition terminal into the copper-aluminum transition junction box, so that the settled wire (aluminum wire) is no longer directly connected to the open copper terminal, but passes through the copper-aluminum transition junction box. Connected with the air switch, so that the connection between the aluminum wire and the copper terminal of the open circuit becomes the connection between the copper piece of the copper-aluminum transition junction box and the copper connection column of the open circuit, which completely solves the problem of easy burning at the copper-aluminum joint question. The above-mentioned technical solution has the advantages of simple installation, time-saving and labor-saving; low cost;

As a preference, several piercing blades are respectively provided on the upper casing and the lower casing, the piercing blades on the upper casing correspond to the piercing blades on the lower casing one by one, and the corresponding piercing blades form a set of blades, Insulation is provided between blade groups of different groups. The structure can make the piercing blade have a better piercing effect on the insulation layer of the aluminum wire, and better close contact with the inner aluminum guide.

Preferably, several sets of blade sets are arranged symmetrically with the connecting bolts as the axis of symmetry. The structure can make the cutting depth and pressing force of each blade group on each aluminum wire as consistent as possible, so as to ensure the cutting effect and the contact conductive effect.

Preferably, the lower shell includes a first outer shell and a first inner shell, the first outer shell and the first inner shell are fixed by two connecting columns, and the upper shell includes a second outer shell a layer shell and a second inner shell, the second outer shell is fixed to the second inner shell, the second inner shell is arranged between the first outer shell and the first inner shell, The two connecting columns pass through the second inner shell, the first inner shell is arranged between the second outer shell and the second inner shell, and the piercing blade is arranged between the second inner shell and the second inner shell. /or on the first outer shell, the two connecting columns are arranged symmetrically with the connecting bolts as the axis of symmetry, the number of blade sets is odd, one set of blade sets is arranged directly below the connecting bolts, and the rest of the blade sets are set with the connecting bolts as the axis of symmetry Symmetrical setting.

When there are an odd number of incoming wires (such as three-phase wires), if the symmetrical setting is not performed, when the connecting nut is tightened, the penetration depth of each piercing blade may be inconsistent, resulting in excessive cutting of some piercing knives, damaging the wires, and some piercing knives Insufficient penetration depth, poor contact between the puncture blade and the guide, and severe local heating. In the above technical solution, by arranging the lower casing and the upper casing as double layers, one group of blade groups can be arranged directly below the connecting bolts, and the rest of the blade groups can be arranged symmetrically with the connecting bolts as the axis of symmetry. In this way, the cutting depth and pressing force of each blade group on each aluminum wire are kept as consistent as possible, so as to ensure the cutting effect and the contact conductive effect. Moreover, the use method of the transition junction box is consistent with the use method of an even number of transition junction boxes, and the operation is simple.

Preferably, the reinforced insulating shell is provided with an opening at one end of the position of the blade set, and an insulating terminal cap is provided at the other end. Insulated terminal caps limit the penetration of aluminum wires.

Preferably, a gasket is provided at the opening of the reinforced insulating shell. The gasket has a sealing effect, isolating air and water, etc.

Preferably, waterproof silicone grease is provided inside the reinforced insulating shell. When the sealing gasket ring is pressed around the position where the wire is pierced, the insulating silicone grease in the housing will overflow. Waterproof silicone grease can block the influence of air and water on electrical contact, and play a role in strengthening the seal.

Preferably, the connecting bolts are high-strength bolts.

Preferably, the connecting nut is a torque nut. The torque nut allows the piercing blade to pierce the insulation of the aluminum wire without damaging the aluminum core itself. The torque nut controls the penetration of the piercing blade to ensure it does not puncture the aluminum core. When the torque reaches the set value, the nut torque mechanism falls off.

The beneficial effects of the present invention are: (1) By integrating the functions of the copper-aluminum transition terminal into the copper-aluminum transition junction box, the settlement wire (aluminum wire) is no longer directly connected to the open copper terminal, but through After the copper-aluminum transition junction box, it is connected with the air switch, so that the original connection between the aluminum wire and the copper terminal of the open circuit becomes the connection between the copper sheet of the copper-aluminum transition junction box and the copper connection column of the open circuit, which completely solves the problem of copper The problem of easy burning at the aluminum joint; (2) Easy installation, time-saving and labor-saving; low cost; The cutting depth and pressing force of each aluminum wire should be kept as consistent as possible to ensure the cutting effect and contact conductive effect.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a schematic structural view of Embodiment 2.

In the figure: reinforced insulation shell 1, lower shell 1.1, first outer shell 1.1.1, first inner shell 1.1.2, connecting column 1.1.3, upper shell 1.2, second outer shell Body 1.2.1, second inner shell 1.2.2, connecting bolt 2, connecting nut 3, connecting piece 4, piercing blade 5, insulating terminal cap 6.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

As shown in Figure 1, a copper-aluminum transition junction box for a switch in front of a meter includes a reinforced insulating case 1, a connecting bolt 2, a connecting nut 3 and a connecting piece 4, and the connecting bolt 2 is a high-strength bolt. The connecting nut 3 is a torque nut. The reinforced insulating shell 1 includes an upper shell 1.2 and a lower shell 1.1, one end of the connecting bolt 2 passes through the lower shell 1.1 and the upper shell 1.2 in turn, and is connected to the connecting nut 3, and the other end of the connecting bolt 2 is pressed down The casing 1.1, the upper casing 1.2 and/or the lower casing 1.1 are fixed with a puncture blade 5, the puncture blade 5 is arranged between the upper casing 1.2 and the lower casing 1.1, and the connecting piece 4 includes a copper end made of copper and the aluminum end made of aluminum, the aluminum end of the connecting piece 4 is connected with the piercing blade 5 , and the copper end of the connecting piece 4 protrudes from the reinforced insulating shell 1 . The reinforced insulating shell 1 is provided with an opening at one end of the position of the blade set, and an insulating terminal cap 6 is provided at the other end. A gasket is provided at the opening of the reinforced insulating shell 1 . The reinforced insulating shell 1 is provided with waterproof silicone grease. The upper casing 1.2 and the lower casing 1.1 are respectively provided with several piercing blades 5, the piercing blades 5 on the upper casing 1.2 correspond to the piercing blades 5 on the lower casing 1.1, and the corresponding piercing blades 5 form A set of blade sets, and insulation between different sets of blade sets. Several groups of blade groups are symmetrically arranged with the connecting bolt 2 as the axis of symmetry.

In the above technical solution, the reinforced insulating shell 1 plays the role of insulation protection. The puncture blade 5 utilizes its structure with a knife thorn, when the pressure is applied to the puncture blade 5, the puncture blade 5 can pierce the insulating layer of the aluminum wire, and the puncture blade 5 is in full contact with the aluminum conductor. The connecting piece 4 acts as a transition between copper and aluminum, and is used to connect the aluminum wire and the copper terminal of the open circuit without loss. The specific operation and working principle of the above-mentioned technical scheme: extend the settlement line (that is, the aluminum wire) into the copper-aluminum transition junction box, and then slightly twist the connecting bolt 2 to fix the position of the settlement line (ensure that the settlement line extends into the required depth without loosening). Tighten the connecting nut 3 with a socket wrench. During the process, the connecting nut 3 is applied with torque, and the "teeth" on the piercing blade 5 will pierce the cable insulation layer and contact the settled wire to realize piercing and electrification. When the torque reaches the set value, use a screwdriver to connect the copper end of the connection piece 4 with the open copper terminal. The above technical solution integrates the functions of the copper-aluminum transition terminal into the copper-aluminum transition junction box, so that the settled wire (aluminum wire) is no longer directly connected to the open copper terminal, but passes through the copper-aluminum transition junction box. The connection with the air switch makes the original connection between the aluminum wire and the copper terminal of the air switch become the connection between the copper sheet of the copper-aluminum transition junction box and the copper connection column 1.1.3 of the open circuit, which completely solves the problem The problem of burnout. The above-mentioned technical solution has the advantages of simple installation, time-saving and labor-saving; low cost;

Example 2:

As shown in Figure 2, on the basis of Embodiment 1, the lower shell 1.1 includes a first outer shell 1.1.1 and a first inner shell 1.1.2, the first outer shell 1.1.1 and the first inner shell 1.1.2 are fixed by two connecting columns 1.1.3, the upper shell 1.2 includes the second outer shell 1.2.1 and the second inner shell 1.2.2, the second outer shell The body 1.2.1 is fixed to the second inner shell 1.2.2, and the second inner shell 1.2.2 is arranged between the first outer shell 1.1.1 and the first inner shell 1.1.2. A connecting column 1.1.3 passes through the second inner shell 1.2.2, and the first inner shell 1.1.2 is arranged between the second outer shell 1.2.1 and the second inner shell 1.2.2 , the piercing blade 5 is arranged on the second inner shell 1.2.2 and/or the first outer shell 1.1.1, and the two connecting columns 1.1.3 are symmetrically arranged with the connecting bolt 2 as a symmetrical axis, and the blade set The number is 3, one set of blade sets is arranged directly under the connecting bolt 2, and the other two sets of blade sets are arranged symmetrically with the connecting bolt 2 as a symmetrical axis.

When there are an odd number of incoming wires (such as three-phase wires), if the symmetrical setting is not performed, when the connecting nut 3 is tightened, the penetration depth of each piercing blade 5 may be inconsistent, resulting in excessive cutting of some piercing knives and damage to the wires. The penetration depth of the puncture knife is insufficient, the puncture blade 5 is in poor contact with the guide, and the local heating is serious. In the above technical solution, by setting the lower casing 1.1 and the upper casing 1.2 as double layers, one group of blade groups can be arranged directly below the connecting bolt 2, and the remaining blade groups can be arranged symmetrically with the connecting bolt 2 as the axis of symmetry. In this way, the cutting depth and pressing force of each blade group on each aluminum wire are kept as consistent as possible, so as to ensure the cutting effect and the contact conductive effect. Moreover, the use method of the transition junction box is consistent with the use method of an even number of transition junction boxes, and the operation is simple.

The beneficial effects of the present invention are: (1) By integrating the functions of the copper-aluminum transition terminal into the copper-aluminum transition junction box, the settlement wire (aluminum wire) is no longer directly connected to the open copper terminal, but through After the copper-aluminum transition junction box, it is connected with the air switch, so that the original connection between the aluminum wire and the copper terminal of the air switch becomes the connection of the connecting copper piece of the copper-aluminum transition junction box with the copper connection column 1.1.3 of the open circuit, completely Solve the problem of easy burning at the copper-aluminum joint; (2) Easy installation, time-saving and labor-saving; low cost; Keep the cutting depth and pressing force of each blade group on each aluminum wire as consistent as possible to ensure the cutting effect and contact conductive effect.

Claims (7)

1. The utility model provides a switch copper aluminium transition terminal box before table, its characterized in that, including reinforcing insulating housing, connecting bolt, coupling nut and connection piece, reinforcing insulating housing includes upper housing and lower casing, and connecting bolt one end passes down the casing in proper order and is connected with coupling nut after going up the casing, and the other end of connecting bolt compresses tightly down the casing, is fixed with the puncture blade on upper housing and/or the lower casing, and the puncture blade sets up between upper housing and lower casing, the connection piece includes copper-made copper end and aluminium system's aluminium end, and the aluminium end of connection piece is connected with the puncture blade, and the copper end of connection piece stretches out reinforcing insulating housing;

the upper shell and the lower shell are respectively provided with a plurality of puncture blades, the puncture blades on the upper shell and the puncture blades on the lower shell are in one-to-one correspondence, the corresponding puncture blades form a group of blade groups, and the blade groups of different groups are arranged in an insulating way;

the lower shell comprises a first outer shell and a first inner shell, the first outer shell and the first inner shell are fixed through two connecting columns, the upper shell comprises a second outer shell and a second inner shell, the second outer shell is fixed with the second inner shell, the second inner shell is arranged between the first outer shell and the first inner shell, the two connecting columns penetrate through the second inner shell, the first inner shell is arranged between the second outer shell and the second inner shell, the puncture blade is arranged on the second inner shell and/or the first outer shell, the two connecting columns are symmetrically arranged by using connecting bolts, the number of blade groups is odd, one blade group is arranged under the connecting bolts, and the rest blade groups are symmetrically arranged by using the connecting bolts.

2. The copper-aluminum transition junction box of a switch in front of a meter according to claim 1, wherein the plurality of blade sets are symmetrically arranged with the connecting bolts as symmetry axes.

3. A copper-aluminium transition junction box for a switch in front of a meter according to claim 1 or 2, wherein the reinforced insulating housing is provided with a blade set at one end opening and an insulating terminal cap at the other end.

4. A copper-aluminum transition junction box for a switch in front of a meter according to claim 3, wherein a sealing gasket is arranged at the opening of the reinforced insulating housing.

5. A copper-aluminum transition junction box for a switch in front of a meter according to claim 1 or 2, wherein waterproof silicone grease is arranged in the reinforced insulating shell.

6. A switch copper aluminium transition junction box according to claim 1 or 2, wherein the connecting bolts are high strength bolts.

7. A copper-aluminum transition junction box for a switch in front of a meter according to claim 1 or 2, wherein said coupling nut is a torque nut.