CN107045964A - A kind of multipole circuit breaker loop structure - Google Patents

Abstract

A kind of multipole circuit breaker loop structure, it includes circuit breaker base, at least 3 groups moving contacts are on main shaft, mutually insulated between each group moving contact after installation, moving contact can be around main axis, every group of moving contact has corresponding static contact or static contact panel and arc-chutes, and main shaft is on circuit breaker base, it is characterised in that：Connected in the circuit breaker base between two groups of moving contacts of phase by a conductor, or pass through a conductor between one group of moving contact and static contact corresponding to one group of moving contact every phase and connect, and after being connected by any of the above mode, same polarity or a pole of same-phase for the alternate series connection with least two breakpoints is constituted, and two groups of moving contacts can independently be rotated relative to main shaft.The present invention effectively improves interrupting performance, extends the purpose of breaker service life.

Description

A circuit structure of multi-pole circuit breaker

technical field

The invention belongs to the technical field of circuit breakers, and in particular relates to a circuit structure of a multi-pole circuit breaker.

Background technique

With the development of new energy technology, higher requirements are put forward for low-voltage electrical components. Especially in photovoltaic power DC systems, the rated operating voltage of low-voltage electrical appliances is even as high as DC1500V. The method of connecting multiple breakpoints in series can improve the breaking performance of the circuit breaker. Currently on the market, wiring is done at the external terminals of the circuit breaker, so that two or more poles of the circuit breaker are connected in series to form a series breakpoint, which can meet the requirements of high working voltage, but this structure causes heat here. The accumulation increases, and after the heat is transferred to the inside of the circuit breaker through heat, it directly affects the operating characteristics of the long-time delay release using bimetallic strips and the working performance of other components. Another connection method is to use internal wiring to connect two or more poles of the circuit breaker in series to form a series breakpoint. Chinese patent 201010527233.9 discloses a multi-breakpoint plastic case circuit breaker. The case circuit breaker adopts the preset connection mode. In the insulating case, each adjacent two sets of moving contacts are connected by a conductor, or one set of moving contacts and the adjacent set of moving contacts correspond to static contacts. The heads are connected by a conductor, and after being connected by any of the above methods, a pole of the same polarity or phase is formed with at least two breakpoints connected in series, and the two sets of moving contacts can rotate independently relative to the insulated shaft. Multiple breakpoints are connected in series inside the circuit breaker housing, and there is no need for the user to connect the wiring at the terminal to connect the breakpoints in series. However, if the connection method of the circuit structure of the multi-pole circuit breaker adopts the method of connecting two adjacent sets of moving contacts through a conductor, the breaking capacity will not be greatly improved, and the electrical connection wiring at the outer end needs to be connected across phases; if a set of moving contacts is used The contacts and the static contacts corresponding to the adjacent set of moving contacts are connected by a conductor, and the current flows between the adjacent two sets of moving contacts in the same direction, and the phase-to-phase influence is relatively large. Under the action of high voltage and high current Under the electromagnetic action, the lower adjacent circuits will have a negative effect on the extinguishment of the arc, and cannot play the role of multiple breakpoints to improve the breaking capacity.

Contents of the invention

The purpose of the present invention is to provide a multi-circuit breaker circuit structure, which does not require the user to connect the breakpoints in order to connect them in series. The wiring at the terminal can not only meet the requirement of using multiple breakpoints in series to increase the working voltage, but also make the heat accumulation be transferred to the inside of the circuit breaker as little as possible, reducing the impact on the bimetal strip and related components. The purpose of changing the original external terminal wiring method is to effectively improve the breaking performance and prolong the service life of the circuit breaker.

Technical solutions

In order to achieve the above technical purpose, the present invention designs a multi-pole circuit breaker circuit structure, which includes a circuit breaker base, at least 3 sets of moving contacts installed on the main shaft, after installation, each set of moving contacts are insulated from each other, and the moving contacts The head can rotate around the main shaft, and each set of moving contacts has corresponding static contacts or static contact plates and arc extinguishing chambers. Two sets of moving contacts are connected through a conductor, or a set of moving contacts and a set of phase-separated moving contacts corresponding to the static contact plates are connected through a conductor, and after being connected by any of the above methods, a structure with at least The phases of the two breakpoints are connected in series with one pole of the same polarity or the same phase, and the two sets of moving contacts can rotate independently relative to the main shaft.

Further, the moving contact includes a moving contact part and a connecting part, the connecting part is connected to the phase-separated static contact plate through a conductor, and the phase-separated static contact plate includes a static silver point part and a pole connection part, and the conductor and the pole connection part To connect, the static silver point is installed in the mounting hole of the circuit breaker base.

Further, the conductor corresponds to the external wiring part of the busbar, and the busbar is installed in the busbar connection groove of the circuit breaker base.

Further, the phase-separated static contact plate is Z-shaped, and the phase-separated static contact plate is fixedly mounted on the outer bottom surface of the circuit breaker base.

Further, the internal wiring part of the busbar is connected to the conductors corresponding to a group of moving contacts separated by phases.

Beneficial effect

The circuit structure of a multi-pole circuit breaker provided by the present invention does not require the user to wire at the terminal for connecting breakpoints in series, which can not only meet the requirement of using multi-breakpoint series connection to increase the working voltage, but also minimize heat accumulation. It is transmitted to the inside of the circuit breaker to reduce the impact on the bimetal and related components. At the same time, it can not change the original external terminal wiring mode, effectively improve the breaking performance and prolong the service life of the circuit breaker.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the installation structure of the first embodiment of the present invention.

Accompanying drawing 2 is the circuit structure diagram of the first embodiment of the present invention.

Accompanying drawing 3 is a schematic diagram of the structure of the static contact in the first embodiment of the present invention.

Figure 4 is a schematic diagram of the structure of the static touch panel in the first embodiment of the present invention.

Accompanying drawing 5 is the schematic diagram of the conductor structure in the first embodiment of the present invention.

Figure 6 is a schematic diagram of the structure of the base in the first embodiment of the present invention.

Accompanying drawing 7 is the structural diagram of the movable contact in the first embodiment of the present invention.

Figure 8 is a schematic diagram of the busbar structure in the first embodiment of the present invention.

detailed description

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

Example 1

As shown in Figures 1 to 8, a multi-pole circuit breaker circuit structure, which includes a circuit breaker base 1, at least 3 sets of moving contacts 2, 2', 2" installed on the main shaft 3, after installation, the moving contacts 2, 2', 2" are insulated from each other, the moving contacts 2, 2', 2" can rotate around the main shaft 3, each group of moving contacts 2 has a corresponding static contact 4 or static contact plate 4' and arc extinguishing Chamber 5, the main shaft 3 is mounted on the circuit breaker base 1, wherein a set of moving contacts 2 and a set of moving contacts 2" separated by phases are connected to each other by a conductor 6, A pole with the same polarity or the same phase is formed in series with at least two breakpoints, and the movable contacts 2, 2', 2" can rotate independently relative to the main shaft 3.

The moving contact 2 includes a moving contact part 201 and a connecting part 202, the connecting part 202 is connected to the phase-separated static contact plate 4' through the conductor 6, and the static contact plate 4' includes a static silver point part 401 and a pole connection part 402 , the conductor 6 is connected to the pole connecting portion 402 , and the static silver point portion 401 is installed at the installation hole 101 of the circuit breaker base 1 .

The conductor 6 corresponds to the external connection part 701 of the bus bar 7 , and the bus bar 7 is installed in the bus bar connecting groove 702 of the circuit breaker base 1 .

Specifically, the static contact plate 4' is Z-shaped, and the static contact plate 4' is fixedly mounted on the outer bottom surface of the circuit breaker base 1.

The internal wiring portion 703 of the busbar 7 is connected to the conductor 6' corresponding to a group of moving contacts 2" separated from each other.

Example 2

The two sets of moving contacts separated by phases in the circuit breaker base are connected by a conductor to form one pole of the same polarity or the same phase in series with at least two breakpoints, and the two sets of moving contacts 2 can be Independent rotation relative to the main shaft 3.

In the circuit structure of a multi-pole circuit breaker provided by the present invention, the dynamic and static silver points of the external wiring part of the busbar are connected in series through the static contact plate and the conductor to form a current branch circuit, and there are at least two breakpoints on the branch circuit. In order to connect the breakpoints in series, the user can connect the wires at the terminals by himself, which can not only meet the requirement of using multiple breakpoints in series to increase the working voltage, but also make the heat accumulation be transferred to the inside of the circuit breaker as little as possible, reducing the impact on the bimetal strip and related components. At the same time, it can not change the original external terminal wiring mode, effectively improve the breaking performance and prolong the service life of the circuit breaker.

The structures, proportions, sizes, etc. shown in the accompanying drawings of this embodiment are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. condition, so it has no technical substantive meaning, and any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of the present invention without affecting the effect and purpose of the present invention. The disclosed technical content must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle", "clockwise", and "counterclockwise" quoted in this specification are only for the convenience of description. It is not intended to limit the applicable scope of the present invention, and the change or adjustment of the relative relationship shall also be regarded as the applicable scope of the present invention without substantive changes in the technical content.

Claims (5)

1. A multi-pole circuit breaker circuit structure, which includes a circuit breaker base, at least 3 sets of moving contacts are installed on the main shaft, after installation, the moving contacts of each group are insulated from each other, and the moving contacts can rotate around the main shaft. The moving contacts have corresponding static contacts or static contact plates and arc extinguishing chambers, and the main shaft is installed on the base of the circuit breaker. Conductor connection, or a set of moving contacts and a set of phase-separated moving contacts corresponding to the static contacts are connected through a conductor, and after being connected by any of the above methods, a phase-to-phase series connection with at least two breakpoints is formed. One pole with the same polarity or the same phase, and the two sets of moving contacts can rotate independently relative to the main shaft. 2. The circuit structure of a multi-pole circuit breaker as claimed in claim 1, wherein the moving contact includes a moving contact part and a connecting part, and the connecting part is connected to the static contact plate separated by a conductor, and the separated phase The static contact plate of the phase includes a static silver point part and a pole connection part, the conductor is connected to the pole connection part, and the static silver point part is installed at the installation hole of the circuit breaker base. 3. The circuit structure of a multi-pole circuit breaker according to claim 1, wherein the conductor corresponds to the external connection part of the busbar, and the busbar is installed in the busbar connection groove of the circuit breaker base. 4. A multi-pole circuit breaker circuit structure as claimed in claim 1, characterized in that: the phase-separated static contact plate is Z-shaped, and the phase-separated static contact plate is fixed on the outer surface of the circuit breaker base. bottom surface. 5 . The circuit structure of a multi-pole circuit breaker according to claim 3 , characterized in that: the internal wiring part of the busbar is connected to the corresponding conductors of a group of moving contacts separated by phases.