CN205723319U - A kind of vacuum circuit breaker - Google Patents

Abstract

The utility model discloses a kind of vacuum circuit breaker.Joint face and/or the surface, galvanic circle of the radiator of this vacuum circuit breaker are covered and are had graphene layer.This utility model, by covering graphene layer at each parts surface of the radiator joint face of vacuum circuit breaker and/or galvanic circle, accelerates conduction and the heat radiation of heat；The each parts surface of radiator joint face and galvanic circle covers graphene layer simultaneously, heat can be accelerated and conducted to radiator by galvanic circle, improve the thermal conductivity of galvanic circle, it is possible to the temperature rise reducing vacuum circuit breaker reaches 3～10 DEG C.

Description

A vacuum circuit breaker

technical field

The utility model belongs to the field of vacuum circuit breakers, in particular to a vacuum circuit breaker which can effectively reduce the temperature rise.

Background technique

Vacuum circuit breakers have the advantages of long service life, easy maintenance, suitable for frequent operation, and small size. With the continuous deepening of vacuum arc theory research and people's increasing attention to the environment, vacuum circuit breakers are constantly miniaturizing the vacuum interrupter , large capacity and high voltage direction. Heat is generated when current flows through the conductive loop of a vacuum circuit breaker. When the rated current is relatively large, the temperature rise of the vacuum circuit breaker is relatively large. Excessive temperature rise not only has a great impact on the mechanical strength of the conductor material, but also easily oxidizes the surface of the conductor metal, and the generated oxide increases the contact resistance and affects the circuit resistance and electrical performance of the circuit breaker. At the same time, the temperature rise is too large It will also increase the dielectric loss of the insulation and accelerate the aging of the insulation. How to effectively reduce the temperature rise of vacuum circuit breakers has received extensive attention.

Yu Xiaoling et al. (High Voltage Electric, Volume 43, No. 3, June 2007) conducted a simulation study on factors affecting the temperature rise of high-voltage vacuum circuit breakers. Four factors such as the contact point radius, contact point position and the radius of the conductive rod are simulated and studied. The heat radiation on the surface of the radiator, the contact radius and the radius of the conductive rod all have certain effects on reducing the temperature rise. CN2747699Y discloses a high-voltage vacuum circuit breaker with a high rated current level, which includes a first radiator connected to the upper flange, a second radiator around the lower flange, ceramic sleeves and vacuum interrupters and There is heat-dissipating insulating oil in the gap between the ceramic sleeve and the conductive support; wherein, the radiator fins of the first radiator and the second radiator are distributed radially or in parallel. The utility model dissipates heat in time through a reasonable heat dissipation structure.

In the prior art, the temperature rise can be reduced from the aspects of the conductive circuit material of the circuit breaker, the interphase spacing of the circuit breaker, and the installation process, but the scope of application is limited, and the effect of reducing the temperature rise is limited and unsustainable.

Utility model content

The purpose of the utility model is to provide a vacuum circuit breaker, so as to solve the problem in the prior art that the temperature rise of the vacuum circuit breaker with a large rated current is relatively large and the temperature rise is insufficient.

In order to achieve the above object, the technical solution adopted in the utility model is:

A vacuum circuit breaker, the connection surface of the heat sink and/or the conductive circuit surface of the vacuum circuit breaker is covered with a graphene layer.

The conductive loop includes an upper wiring board, a static conductive rod, a moving conductive rod and a lower wiring board connected in sequence. The connection surface of the radiator is the connection surface formed by connecting the radiator and the conductive circuit.

The thickness of the graphene layer is 1-500 μm. Controlling the graphene layer within this range can effectively reduce the temperature rise without affecting other performances of the vacuum circuit breaker.

During the manufacture of the above-mentioned vacuum circuit breaker, a graphene layer is prepared on the connecting surface of the radiator and/or the surface of each component of the conductive circuit, and then assembled into a vacuum circuit breaker. Preferably, a graphene layer is prepared on the surface of the upper wiring board, the static conductive rod, the moving conductive rod and the lower wiring board and/or the connection surface of the radiator, and assembled into a vacuum circuit breaker.

The graphene layer can be prepared by spraying, brushing or dipping. When the spraying process is used, a layer of graphene is sprayed on the surface of each component of the conductive circuit of the vacuum circuit breaker, and the connection surface between the radiator and the upper terminal board, and then dried in the air or dried at 50 ° C to 300 ° C. When using the brushing process, brush a layer of graphene on the surface of each component of the conductive circuit of the vacuum circuit breaker, the connection surface between the radiator and the upper terminal board, and dry it in the air or dry it at 50 ° C to 300 ° C. When the dip coating process is adopted, the components of the conductive circuit of the vacuum circuit breaker, the connection surface of the radiator and the upper terminal board are immersed in the graphene slurry, taken out, and dried in the air or at 50°C to 300°C.

The graphene slurry used for spraying, brushing or dipping can adopt commercially available goods. Preferably, the mass percent composition of the graphene slurry is: 70%-95% of solvent, 4.5%-27% of graphene, and 0.5%-3% of dispersant. The graphene slurry can be obtained by uniformly dispersing each component under high-speed dispersing equipment.

The solvent is water, ethanol or acetone, and the dispersant is dimethylformamide (DMF) or N-methylpyrrolidone (NMP).

The material of each part of the conductive circuit or the connection surface of the radiator can be copper or aluminum.

The vacuum circuit breaker provided by the utility model covers the graphene layer on the connecting surface of the radiator and/or the surface of each component of the conductive circuit, and utilizes the good thermal conductivity, electrical conductivity and heat dissipation of the graphene layer to reduce the heat generated by the conductive circuit The external transmission improves the external transmission rate of heat and effectively reduces the temperature rise when the high rated current passes through the vacuum circuit breaker; by covering the connection surface between the radiator and the upper terminal board and the surface of the conductive circuit components at the same time The ethylene layer can further accelerate the rate at which the heat generated by the conductive loop is dissipated from the radiator, thereby reducing the temperature rise more effectively. Since graphene itself also has a strong heat dissipation capability, graphene itself can also reduce temperature rise.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the vacuum circuit breaker of the present invention.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

Example

The embodiment of the vacuum circuit breaker of the present invention, the structure is shown in Figure 1, including the upper wiring board 1, the static conductive rod 2, the dynamic conductive rod 3, the lower wiring board 4, the radiator 5 and the vacuum interrupter 6, and the upper wiring board The radiator 5 is connected above the board 1, the static conductive rod 2 is connected with the upper terminal board 1, the dynamic conductive rod 3 is connected with the lower terminal board 4, and the static conductive rod 2 and the dynamic conductive rod 3 are realized in the vacuum interrupter 6. Breaking, the upper wiring board 1, the static conductive rod 2, the moving conductive rod 3, and the lower wiring board 4 form a conductive loop; the surface of each component of the conductive loop, and the connecting surface between the radiator and the upper wiring board are covered with a graphene layer 7 , the thickness of the graphene layer is 100 μm.

The temperature rise test was carried out in accordance with the provisions of "GB/T 11022-2011 Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards". The detection current was 2000A. The test results of graphene layer thickness and temperature rise are shown in Table 1.

Table 1 Temperature rise test results of vacuum circuit breaker

Graphene layer thickness, μm Vacuum circuit breaker temperature rise, ℃ Temperature rise reduction value, ℃ 0 32 0 5 29 3 50 28 4 100 27 5 200 26 6 300 twenty four 8 500 twenty two 10

In other embodiments of the vacuum circuit breaker, the graphene layer may only be coated on the connecting surface of the heat sink and the upper wiring board or the surfaces of the components of the conductive circuit may be coated with a graphene layer.

Claims (4)

1. a vacuum circuit breaker, it is characterised in that joint face and/or the surface, galvanic circle of the radiator of vacuum circuit breaker are covered Graphene layer.

2. vacuum circuit breaker as claimed in claim 1, it is characterised in that described galvanic circle include being sequentially connected on connect Line plate, static conductive rod, moving conductive rod and lower patch panel.

3. vacuum circuit breaker as claimed in claim 2, it is characterised in that radiator is connected with upper wiring board.

4. the vacuum circuit breaker as described in any one of claims 1 to 3, it is characterised in that the thickness of graphene layer be 1～ 500μm。