CN207338656U - A kind of busbar connection structure for reducing contact resistance - Google Patents

Abstract

The utility model discloses a bus bar connection structure capable of reducing contact resistance, which comprises a bus bar, bolts and nuts; a bolt connection hole is provided at the overlapping surface of the bus bar, and the bolt is inserted into the bolt connection hole, and the adjacent bus bar Connections are secured by bolt and nut locks. The utility model reduces the contact resistance, can effectively reduce the local temperature rise, and improves the power supply reliability of the equipment.

Description

A busbar connection structure capable of reducing contact resistance

technical field

The utility model relates to the technical field of power distribution and power supply, in particular to a busbar connection structure capable of reducing contact resistance.

Background technique

Copper bars, also known as copper bus bars or copper bus bars, are made of copper and have rectangular or chamfered (rounded) rectangular long conductors (now generally use rounded copper bars to avoid tip discharge). The circuit plays the role of transmitting current and connecting electrical equipment. Copper bars are widely used in electrical equipment, especially complete power distribution devices.

The connection between the copper bars in the high-voltage and low-voltage switchgear is fixed by bolts. When the contact resistance generated by the overlapping surface of the copper bars is large, it is easy to generate local heating, which in turn affects the normal use of electrical equipment.

Therefore, the inventor made further research on this, and developed a busbar connection structure that can reduce the contact resistance, and this case arose from it.

Utility model content

The technical problem to be solved by the utility model is to provide a busbar connection structure that can reduce the contact resistance, which can effectively reduce the local temperature rise and improve the power supply reliability of the equipment.

For solving the problems of the technologies described above, the technical solution of the utility model is:

A busbar connection structure that can reduce contact resistance, including busbars, bolts and nuts; bolt connection holes are opened at the overlapping surfaces of the busbars, and bolts are inserted into the bolt connection holes, and adjacent busbars are connected through bolts and nuts Lock securely.

Further, a washer is also included, and the washer is threaded on the bolt.

Further, the bolt connection hole is provided with two slots along the axial direction of the busbar.

After adopting the above scheme, the structure of the utility model is very simple. By opening bolt connection holes on the busbar, bolts and nuts are used to cooperate with each other to connect two adjacent busbars. In the case of stress, it can generate greater pressure and strain at the overlapping surface of the copper bar, making the contact surface of the bus bar more reliable, thereby reducing the contact resistance at the bus bar connection.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic structural diagram of the busbar in Fig. 1;

Figure 3 is a comparison of the stress diagrams generated by the joint surface under the ordinary bolt hole and the connection hole with special-shaped bolts;

Figure 4 is a comparison of the strain diagrams produced by the lap joint surface under ordinary bolt holes and holes with special-shaped bolt connections.

Label description

Busbar 1 Bolt hole 2 Bolt 3 Washer 4 Nut 5

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. The utility model discloses a busbar connection structure that can reduce contact resistance, as shown in Figure 1 and Figure 2, which is a preferred embodiment of the utility model, including a busbar 1, bolts 3 and nuts 5. A bolt connection hole 2 is opened at the overlapping surface of the busbar 1, and a bolt 3 is inserted into the bolt connection hole 2, and the bolt 3 and the nut 5 are locked and fixed so that adjacent busbars 1 are connected.

Further, a washer 4 is included, and the washer 4 is threaded on the bolt 3 so as to improve the stability of locking the bolt 3 and the nut 5 .

Further, two grooves are formed along the bolt connection hole 2 along the axial side of the busbar 1 . That is, the bolt connection hole 2 is composed of a bolt hole and a groove formed along the vertical direction of the axis of the busbar 1 . The function of slotting is as follows: 1. Opening two small slots does not affect the flow capacity of the current-carrying copper bar; 2. After slotting, a greater contact stress can be generated near the opening of the contact surface of the copper bar, thereby reducing the contact contact resistance 3. After slotting, the upper and lower busbars have small holes through them, and the Joule heat generated by the contact resistance at the contact point can be cooled by fluid, and the heat dissipation effect is better.

The utility model has a simple structure. By setting up bolt connection holes 2 on the busbars 1, adjacent busbars 1 are overlapped and locked and fixed by bolts 3 and nuts 5. Since the bolt 3 can be put into the bolt connection hole 2 as a whole, it is convenient to tighten the fixing nut 5, which not only makes the connection of the busbar 1 not easy to loosen, but also provides a greater Stress, resulting in greater strain, thereby increasing the contact area and reducing contact resistance.

As shown in Figure 3 and Figure 4, under the same bolt pre-tightening force, the stress and strain of the common bolt hole and the lap joint surface with special-shaped bolt holes are compared. As shown in Figure 3, it is a comparison of stress diagrams. The left diagram shows the stress unit N/m ² generated under ordinary bolts. As shown in Figure 4, it is a comparison of strain diagrams, and the left diagram shows the strain unit m generated under ordinary bolts.

The above are only preferred embodiments of the present utility model, and are not intended to limit the technical scope of the present utility model. Therefore, any changes or modifications made according to the claims of the utility model and the specification should belong to the utility model. Within the scope covered by the utility model patent.

Claims (2)

1. A busbar connection structure that can reduce contact resistance, characterized in that: it includes busbars, bolts and nuts; a bolt connection hole is provided at the overlapping surface of the busbar, and the bolt is inserted into the bolt connection hole, and the adjacent busbar The connection of the busbar is locked and fixed by bolts and nuts, and the bolt connection hole has two slots along the side of the busbar axis. 2 . The busbar connection structure capable of reducing contact resistance according to claim 1 , further comprising a washer, which is passed through the bolt. 3 .