CN220543822U - Reinforced coil arc extinguishing structure of circuit breaker - Google Patents

Abstract

The utility model provides an enhancement coil arc extinguishing structure of circuit breaker, it includes the explosion chamber, moving contact and static contact joint and separation position are in the electric arc entrance of explosion chamber, the setting of striking angle is in the electric arc entrance of explosion chamber is located moving contact and static contact joint and separation position below, its characterized in that: the arc inlet of the arc extinguishing chamber is provided with a magnetism increasing coil component, the magnetism increasing coil component is connected into a circuit and can generate a magnetic field in a corresponding direction when current in a corresponding direction passes through the circuit, and magnetic field force in the corresponding direction generated by the magnetic field in the corresponding direction can enable corresponding arcs generated by the circuit breaker to be subjected to magnetic blowing force in the direction of the arc extinguishing chamber. This arc extinguishing structure is through setting up the magnetism increasing coil subassembly near moving and static contact, makes the corresponding electric arc that the circuit breaker produced all receive the magnetic blow force towards explosion chamber direction, and magnetism increasing coil subassembly and magnetic conduction piece cooperation reinforcing magnetic field simultaneously to shorten the arcing time.

Description

Reinforced coil arc extinguishing structure of circuit breaker

Technical Field

The utility model belongs to the technical field of circuit breakers, and particularly relates to an enhanced coil arc extinguishing structure of a circuit breaker.

Background

The circuit breaker is an important part in the distribution electrical equipment, is mainly used for an industrial low-voltage power system, and is used for switching on and off current in a power grid circuit and protecting a circuit and power supply equipment from damage caused by faults such as overload, undervoltage, short circuit, single-phase grounding and the like. The breaking function of the circuit breaker for overload or short-circuit current is mainly completed through an arc extinguishing chamber arranged in the circuit breaker. When fault current occurs in the circuit and the current value exceeds the set protection range of the intelligent controller, the operating mechanism is driven to act, so that the moving contact and the fixed contact of the circuit breaker are rapidly disconnected, and at the moment, the voltage between the moving contact and the fixed contact causes air medium discharge so as to generate high-temperature arc. The arc causes a sharp rise in the air temperature within the arc extinguishing device during combustion, thereby accelerating air ionization. On the other hand, the electric arc is separated into a plurality of short arcs by a plurality of arc separation grid plates under the pushing of the magnetic field and the fluid effect in the arc extinguishing chamber, the deionization effect of the electric arc is enhanced by virtue of the metal arc separation plates, the electric arc is reduced, the voltage is rapidly increased, and the electric arc is extinguished.

The utility model discloses a traditional direct current circuit breaker's contact is difficult for extinguishing rapidly at breaking or the electric arc that produces when merging, has seriously delayed the breaking capacity of circuit breaker, and the arc extinguishing mode of using always is that the electric arc that will produce is introduced the explosion chamber through the striking to carry out the arc extinction, chinese patent ZL201621308279.0 discloses a nonpolar direct current miniature circuit breaker, and it includes stationary contact, moving contact and is close to striking and explosion chamber that stationary contact and moving contact set up, nonpolar direct current miniature circuit breaker still includes the striking coil, the one end electricity of striking coil is connected to the tip of striking, the striking coil sets up to: the magnetic field generated by the striking coil causes the arc to be subjected to a force directed towards the arc extinguishing chamber, and the direction of the force is not affected by the polarity of the arc.

However, when the existing direct current circuit breaker (MCB) is applied to a high-voltage direct current environment, the phenomena of overlong arcing time and product burning loss still exist.

Disclosure of Invention

The utility model aims to overcome the defects existing in the use process of the existing direct current circuit breaker, and provides an enhanced coil arc extinguishing structure of the circuit breaker.

Technical proposal

In order to achieve the technical purpose, the utility model provides an enhanced coil arc extinguishing structure of a circuit breaker, which comprises an arc extinguishing chamber, wherein a moving contact and a fixed contact joint and separation part are positioned at an arc inlet of the arc extinguishing chamber, an arc striking angle is arranged at the arc inlet of the arc extinguishing chamber and positioned below the moving contact and fixed contact joint and separation part, and the enhanced coil arc extinguishing structure is characterized in that: the arc inlet of the arc extinguishing chamber is provided with a magnetism increasing coil component, the magnetism increasing coil component is connected into a circuit and can generate a magnetic field in a corresponding direction when current in a corresponding direction passes through the circuit, and magnetic field force in the corresponding direction generated by the magnetic field in the corresponding direction can enable corresponding arcs generated by the circuit breaker to be subjected to magnetic blowing force in the direction of the arc extinguishing chamber.

In one embodiment, the magnetizing coil assemblies are connected in parallel or in series into the main circuit of the circuit breaker.

In one embodiment, the magnetism increasing coil assembly comprises a magnetism increasing iron core and a magnetism increasing coil, and the magnetism increasing coil is sleeved on the magnetism increasing iron core;

one end of the magnetism increasing coil is connected with the arc striking angle, the other end of the magnetism increasing coil is connected with the moving contact so as to be connected into the main loop circuit of the circuit breaker in parallel, or one end of the magnetism increasing coil is connected with the bimetal element, and the other end of the magnetism increasing coil is connected with the moving contact so as to be connected into the main loop circuit of the circuit breaker in series.

In one embodiment, the magnet increasing core is arranged in a mounting shaft hole between the first gas generating piece and the second gas generating piece at two sides of the arc inlet of the arc extinguishing chamber.

In one embodiment, the first gas-generating piece and the second gas-generating piece are respectively provided with a first magnetic conductive sheet and a second magnetic conductive sheet on the outer side surfaces of the first gas-generating piece and the second gas-generating piece, which correspond to the joint and separation positions of the movable contact and the fixed contact.

In one embodiment, the first magnetic conductive sheet and the second magnetic conductive sheet are respectively installed in a corresponding installation groove I and a corresponding installation groove II on the outer side surfaces of the first gas generating piece and the second gas generating piece.

In one embodiment, the first magnetic increasing piece and the second magnetic increasing piece are respectively arranged on the outer side surfaces of the first gas generating piece and the second gas generating piece on two sides of the arc inlet of the arc extinguishing chamber respectively and are positioned below the corresponding first magnetic conducting piece and the second magnetic conducting piece.

In one embodiment, two ends of the magnetism increasing iron core extend out of two ends of the mounting shaft hole respectively to be connected with the corresponding first magnetic conduction sheet and the corresponding second magnetic conduction sheet.

In one embodiment, one end of the magnetism increasing coil is connected with the notch at the top end of the arc striking angle in a lap joint mode, and the other end of the magnetism increasing coil is connected with the moving contact through soft connection.

In one embodiment, the first gas generating member and the second gas generating member are connected through shaft hole matching, and the first gas generating member and the second gas generating member are respectively located at two sides of the arc inlet of the arc extinguishing chamber.

Advantageous effects

The utility model provides an enhanced coil arc extinguishing structure of a circuit breaker, which comprises an arc extinguishing chamber, wherein a joint and separation part of a moving contact and a fixed contact is positioned at an arc inlet of the arc extinguishing chamber, an arc striking angle is arranged at the arc inlet of the arc extinguishing chamber and below the joint and separation part of the moving contact and the fixed contact, a magnetism increasing coil assembly is arranged at the arc inlet of the arc extinguishing chamber, the magnetism increasing coil assembly is connected into a circuit and can generate magnetic fields in corresponding directions when current in corresponding directions passes through the circuit, and magnetic field forces in corresponding directions generated by the magnetic fields in corresponding directions can enable corresponding arcs generated by the circuit breaker to be subjected to magnetic blowing forces in the direction of the arc extinguishing chamber. This arc extinguishing structure is through setting up the magnetism increasing coil subassembly near moving and static contact, makes the corresponding electric arc that the circuit breaker produced all receive the magnetic blow force towards explosion chamber direction, and magnetism increasing coil subassembly and magnetic conduction piece cooperation reinforcing magnetic field simultaneously to shorten the arcing time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the circuit breaker arc extinguishing structure in embodiment 1 of the present utility model;

FIG. 2 is a schematic diagram of the installation of the solenoid assembly of embodiment 1 of the present utility model;

FIG. 3 is a schematic diagram of the added core product of example 1 of the present utility model;

FIG. 4 is a schematic diagram of the upper gas-generating member of example 1 of the present utility model;

FIG. 5 is a schematic diagram of a lower gas generant composition in accordance with example 1 of the utility model;

FIG. 6 is a second schematic diagram of the lower gas generant composition in accordance with example 1 of the utility model;

FIG. 7 is a schematic diagram of the first or second magnetic amplifying sheet according to example 1 of the present utility model;

FIG. 8 is a schematic diagram of the first magnetic sheet or the second magnetic sheet in embodiment 1 of the present utility model;

FIG. 9 is a schematic view of the arc ignition angle product of example 1 of the present utility model;

fig. 10 is a schematic diagram of the working principle of the arc extinguishing structure in embodiment 1 of the present utility model;

fig. 11 is a schematic diagram of the working principle of the arc extinguishing structure in embodiment 2 of the present utility model;

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

Example 1

When the existing direct current circuit breaker (MCB) is applied to a high-voltage direct current environment, the phenomena of overlong arcing time and product burning loss exist. In order to solve this problem, as shown in fig. 1, the present embodiment provides an enhanced coil arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber 1, a joint and separation portion of a moving contact 2 and a fixed contact 3 is located at an arc entrance of the arc extinguishing chamber 1, an arc striking angle 4 shown in fig. 9 is disposed at the arc entrance of the arc extinguishing chamber 1 below the joint and separation portion of the moving contact 2 and the fixed contact 3, and as shown in fig. 2, a magnetizing coil assembly a is disposed at the arc entrance of the arc extinguishing chamber 1, wherein the arc entrance refers to a region from a position where an arc is generated by contact and separation of the moving contact 2 and the fixed contact 3 in front of the arc extinguishing chamber to a position where the arc is extinguished by an arc extinguishing chamber grid sheet in the arc extinguishing chamber, and generally, the arc generated by joint and separation of the moving contact 2 and the fixed contact 3 moves at the arc entrance before entering the arc extinguishing chamber 1. The magnetism increasing coil assembly a is connected into a circuit and can generate a magnetic field in a corresponding direction when current in the corresponding direction passes through the circuit, and the magnetic field force in the corresponding direction generated by the magnetic field in the corresponding direction can enable the corresponding electric arc generated by the circuit breaker to be subjected to magnetic blowing force in the direction of the arc extinguishing chamber 1. In this embodiment, as shown in fig. 1,2 and 10, the magnetism increasing coil assembly a is connected in parallel or in series to the main circuit of the circuit breaker, and in this embodiment, the magnetism increasing coil assembly a is connected in parallel to the main circuit of the circuit breaker, one end of the magnetism increasing coil assembly a is connected with the arc striking angle 4, and the other end is connected with the moving contact 2. Specifically, the magnetism increasing coil assembly a comprises a magnetism increasing iron core a1 and a magnetism increasing coil a2 shown in fig. 3, wherein the magnetism increasing coil a2 is sleeved on the magnetism increasing iron core a1, one end of the magnetism increasing coil assembly a is connected with the arc striking angle 4, and the other end of the magnetism increasing coil assembly a is connected with the moving contact 2. Further, one end of the magnetizing coil a2 is in lap joint with a notch 401 at the top end of the arc striking angle 4, and the other end is connected with the moving contact 2 through soft connection (not shown in the drawing).

The magnetism increasing iron core a1 is arranged in an installation shaft hole 7 between the first gas generating piece 5 and the second gas generating piece 6 at the two sides of the arc inlet of the arc extinguishing chamber 1. The first gas generating piece 5 and the second gas generating piece 6 are connected through shaft hole matching, and the first gas generating piece 5 and the second gas generating piece 6 are respectively positioned at two sides of an arc inlet of the arc extinguishing chamber 1. Specifically, as shown in fig. 5, the second gas generating member 6 is provided with a connecting shaft 602, as shown in fig. 4, the first gas generating member 5 is provided with a connecting hole 502 matched with the connecting shaft 602, and the connecting shaft 602 is matched with the connecting hole 502 to fixedly connect the first gas generating member 5 and the second gas generating member 6.

As shown in fig. 1, the outer side surfaces of the first gas generating member 5 and the second gas generating member 6 are respectively provided with a first magnetic conductive sheet 8 and a second magnetic conductive sheet 9 as shown in fig. 8, which correspond to the joint and separation positions of the movable contact 2 and the fixed contact 3. The first magnetic conductive sheet 8 and the second magnetic conductive sheet 9 are respectively installed in the corresponding first installation groove 501 and the second installation groove 601 on the outer side surface of the first gas generating member 5 shown in fig. 4 and the second gas generating member 6 shown in fig. 5 and 6. The first magnetic increasing piece 10 and the second magnetic increasing piece 11 shown in fig. 7 are respectively arranged on the outer side surfaces of the first gas generating piece 5 and the second gas generating piece 6 on the two sides of the arc inlet of the arc extinguishing chamber 1 and are positioned below the corresponding first magnetic conducting piece 8 and second magnetic conducting piece 9. The two ends of the magnetism increasing iron core a1 extend out from the two ends of the installation shaft hole 7 respectively and are connected with the corresponding first magnetic conduction sheet 8 and the corresponding second magnetic conduction sheet 9. The first magnetic conduction sheet 8 and the second magnetic conduction sheet 9, the first magnetism increasing sheet 10 and the second magnetism increasing sheet 11 can provide magnetic field force when the magnetism increasing coil assembly generates magnetic field, so that the electric arc can enter the arc extinguishing chamber more quickly.

In this embodiment, as shown in fig. 1,2 and 10, the wiring board 12, the bimetal element 13, the arc striking angle 4, the magnetizing coil a2 and the flexible connection (not shown in the drawings) are connected in parallel, and the moving contact 2 forms a current loop, that is, the magnetizing coil a2 is connected in parallel with the main loop.

Example 2

As shown in fig. 11, the magnetism increasing coil assembly a is connected in series to a main circuit of the circuit breaker, namely, the magnetism increasing coil a2 is connected in series with the main circuit, specifically, a wiring board 12, a bimetal element 13, the magnetism increasing coil a2, a flexible connection one 14, and a moving contact 2 are sequentially connected in series, and other structures and principles are the same as those of the embodiment 1.

The magnetic increasing coil assembly a provided by the utility model is connected in parallel or in series in the main circuit of the circuit breaker, and the embodiment uses the magnetic increasing coil to generate a strong magnetic field which is distributed in an arc inlet area, wherein the direction of the magnetic field changes along with the change of the current direction, for example, when forward current is passed, the direction of the magnetic field changes from left to right, and when reverse current is passed, the direction of the magnetic field changes from right to left and is always orthogonal with the current direction; and a strong magnetic blowing force is generated to perform arc extinction.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. The utility model provides an enhancement coil arc extinguishing structure of circuit breaker, it includes explosion chamber (1), moving contact (2) and stationary contact (3) joint and separation position are in the electric arc entrance of explosion chamber (1), arc striking angle (4) set up the electric arc entrance of explosion chamber (1) is located moving contact (2) and stationary contact (3) joint and separation position below, its characterized in that: the arc inlet of the arc extinguishing chamber (1) is provided with a magnetism increasing coil component (a), the magnetism increasing coil component (a) is connected into a circuit and can generate a magnetic field in a corresponding direction when current in the corresponding direction passes through the circuit, and the magnetic field force in the corresponding direction generated by the magnetic field in the corresponding direction can enable the corresponding arc generated by the circuit breaker to be subjected to magnetic blowing force in the direction of the arc extinguishing chamber (1).

2. The enhanced coil quenching structure of a circuit breaker as recited in claim 1, wherein: the magnetizing coil assembly (a) is connected in parallel or in series into a main loop circuit of the circuit breaker.

3. The enhanced coil quenching structure of a circuit breaker as claimed in claim 2, wherein: the magnetizing coil assembly (a) comprises a magnetizing iron core (a 1) and a magnetizing coil (a 2), and the magnetizing coil (a 2) is sleeved on the magnetizing iron core (a 1);

one end of the magnetism increasing coil (a 2) is connected with the arc striking angle (4), the other end of the magnetism increasing coil is connected with the moving contact (2) so as to be connected into the main loop circuit of the circuit breaker in parallel, or one end of the magnetism increasing coil (a 2) is connected with the bimetal element (13), and the other end of the magnetism increasing coil is connected with the moving contact (2) so as to be connected into the main loop circuit of the circuit breaker in series.

4. A reinforced coil quenching structure of a circuit breaker as claimed in claim 3, wherein: the magnetism increasing iron core (a 1) is arranged in an installation shaft hole (7) between the first gas generating piece (5) and the second gas generating piece (6) at two sides of the arc inlet of the arc extinguishing chamber (1).

5. The enhanced coil quenching structure of a circuit breaker as recited in claim 4, wherein: the outer side surfaces of the first gas generating piece (5) and the second gas generating piece (6) are respectively provided with a first magnetic conduction sheet (8) and a second magnetic conduction sheet (9) corresponding to the joint and separation positions of the movable contact (2) and the fixed contact (3).

6. The enhanced coil quenching structure of a circuit breaker of claim 5, wherein: the first magnetic conduction sheet (8) and the second magnetic conduction sheet (9) are respectively arranged in the corresponding first installation groove (501) and the corresponding second installation groove (601) on the outer side surfaces of the first gas production piece (5) and the second gas production piece (6).

7. The enhanced coil quenching structure of a circuit breaker as recited in claim 1, wherein: the first magnetic increasing piece (10) and the second magnetic increasing piece (11) are respectively and correspondingly arranged on the outer side surfaces of the first gas generating piece (5) and the second gas generating piece (6) on the two sides of the arc inlet of the arc extinguishing chamber (1) and are positioned below the corresponding first magnetic conducting piece (8) and second magnetic conducting piece (9).

8. The enhanced coil quenching structure of a circuit breaker as recited in claim 4, wherein: two ends of the magnetism increasing iron core (a 1) extend out of two ends of the installation shaft hole (7) respectively and are connected with the corresponding first magnetic conduction sheet (8) and the corresponding second magnetic conduction sheet (9).

9. A reinforced coil quenching structure of a circuit breaker as claimed in claim 3, wherein: one end of the magnetizing coil (a 2) is in lap joint with a notch (401) at the top end of the arc striking angle (4), and the other end of the magnetizing coil is connected with the moving contact (2) through soft connection so as to be connected into a main loop circuit of the circuit breaker in parallel.

10. The enhanced coil quenching structure of a circuit breaker as recited in claim 1, wherein: the first gas generating piece (5) and the second gas generating piece (6) are connected through shaft hole matching, and the first gas generating piece (5) and the second gas generating piece (6) are respectively positioned at two sides of an arc inlet of the arc extinguishing chamber (1).