Safety circuit breaker

Abstract

A safety type circuit breaker comprises a circuit breaker body, the circuit breaker body comprises a shell, a closing assembly, an arc extinguishing assembly and an overload protection mechanism, the closing assembly, the arc extinguishing assembly and the overload protection mechanism are arranged in the shell, the closing assembly comprises a movable contact, a static contact and a binding post, and the arc extinguishing assembly comprises an arc striking plate, a plurality of arc dividing grooves, a plurality of arc extinguishing grid pieces and a plurality of arc spraying outlets. The shell is internally provided with a first arc dividing plate and a second arc dividing plate, the first arc dividing plate and the second arc dividing plate are located on one side of the arc outlets formed by the arc extinguishing grid pieces and have an arc travel distance, and the first arc dividing plate is used for guiding the arc to the arc spraying outlets located on the upper portion and the middle portion of the middle. The second arc dividing plate is used for guiding the electric arc to an arc spraying outlet located in the lower middle position.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a safety type circuit breaker. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. It generally consists of a contact system, an arc extinguishing system, an operating mechanism, a release, a housing, etc. When a short circuit occurs, the magnetic field generated by a large current, generally 10 to 12 times, overcomes the counterforce spring, and the release pulls the operating mechanism to act, and the switch trips instantaneously; when overloaded, the current increases, the heat generation intensifies, and the bimetallic strip deforms to a certain extent to push the mechanism to act. The greater the current, the shorter the action time.

[0003] Publication (Announcement) Number: CN214378209U discloses a safety type circuit breaker with an arc extinguishing system, including a circuit breaker body. The circuit breaker body includes a housing, a closing assembly, and an overload protection mechanism. The closing assembly includes a moving contact, a static contact, and a terminal. An arc extinguishing structure is provided inside the housing,... The lower arc spraying outlet is formed on the housing and is located at the lower corner of the housing. In the above, the arc leading unit includes an arc leading plate, and the arc leading plate is close to the moving contact. This safety type circuit breaker uses a reasonable arc extinguishing structure design to disperse the arc, reduce the internal pressure, and can also prevent the charged particles in the circuit breaker housing from spraying out through the arc spraying port, eliminating the safety risks that may be caused by the spraying of charged particles, ensuring the safe operation of the circuit breaker, and thus improving the use safety of the circuit breaker. However, there are defects, mainly reflected in the arc splitting plate of the arc outlet unit. Only one arc splitting plate for guiding is provided, and its position is located at the lower-middle position of the arc extinguishing unit. As a result, this arc splitting plate can only guide the arc to the lower arc spraying outlet. When the arc leaves from the upper-middle position of the arc extinguishing unit, the arc cannot be clearly directed, resulting in the arc moving aimlessly. This will prolong the time for the arc to reach the upper arc spraying outlet and the middle arc spraying outlet, and also affect the efficiency of the arc being discharged, that is, it causes the internal pressure to not decrease quickly. Summary of the Utility Model

[0004] The utility model aims to solve the above-mentioned disadvantages of the prior art and provides a safety type circuit breaker to solve the above problems.

[0005] The technical solution adopted by the present utility model to solve its technical problems: This safety circuit breaker includes a circuit breaker body, which includes a housing, a closing assembly, an arc extinguishing assembly, and an overload protection mechanism arranged inside the housing. The closing assembly includes a moving contact, a static contact, and a terminal. The arc extinguishing assembly includes an arc guiding plate, a plurality of arc dividing grooves, a plurality of arc extinguishing grids, and a plurality of arc spraying outlets, which are respectively located at positions slightly above the middle, in the middle, and slightly below the middle of the housing. A first arc dividing plate and a second arc dividing plate are arranged inside the housing on one side of the arc outlet formed by the arc extinguishing grids and having an arc traveling distance. The first arc dividing plate guides the arc towards the arc spraying outlets located at positions slightly above the middle and in the middle, and the second arc dividing plate guides the arc towards the arc spraying outlet located at the position slightly below the middle.

[0006] For further improvement, the first arc dividing plate includes a first horizontal introducing section defining a guiding direction, and two vertical leading sections distributed vertically. The two vertical leading sections are arranged in a left-right staggered manner. The first horizontal introducing section is arranged at the middle position between the two vertical leading sections to form two guiding trajectories guiding in different directions and matching the arc spraying outlets located at positions slightly above the middle and in the middle.

[0007] For further improvement, a first turning guiding section is arranged between the first horizontal introducing section and the upper vertical leading section, and between the first horizontal introducing section and the lower vertical leading section, so as to guide the arc through the first turning guiding section to reach the upper vertical leading section and the lower vertical leading section in the turning guiding direction from the first horizontal introducing section.

[0008] For further improvement, the second arc dividing plate includes a second horizontal introducing section defining a guiding direction, a horizontal leading section, and an intermediate guiding section connecting the two. There are included angles A between the second horizontal introducing section and the intermediate guiding section, and between the horizontal leading section and the intermediate guiding section, and A = 105° to match the arc spraying outlet located at the position slightly below the middle.

[0009] For further improvement, a second turning guiding section is arranged between the second horizontal introducing section and the intermediate guiding section, and between the horizontal leading section and the intermediate guiding section, so as to guide the arc through the second turning guiding section to reach the intermediate guiding section from the second horizontal introducing section and reach the horizontal leading section from the intermediate guiding section in the turning guiding direction.

[0010] For further improvement, both the first turning guiding section and the second turning guiding section are in an arc configuration.

[0011] For further improvement, a guiding block is arranged on one side of the second arc dividing plate inside the housing and close to the horizontal leading section, and the guiding block is used to guide the arc towards the arc spraying outlet located at the position slightly below the middle or the horizontal leading section.

[0012] Further improved, the guiding block includes a first guiding section and a second guiding section. The first guiding section is inclined and points to the arc spraying outlet. The second guiding section forms an angle B with the first guiding section and points to the lateral leading-out section, where B = 70°.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The present utility model adds a guide on the path where the electric arc moves towards the arc spraying outlets located at the upper-middle and middle positions. This can provide a clear direction for the electric arc, preventing the electric arc from moving aimlessly, reducing the time for the electric arc to reach the upper arc spraying outlet and the middle arc spraying outlet, improving the efficiency of discharging the electric arc, achieving a rapid reduction of the internal pressure, and enhancing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the first arc splitting plate of the present utility model;

[0017] Figure 3 is a schematic structural diagram of the second arc splitting plate of the present utility model;

[0018] Figure 4 is a schematic structural diagram of the guiding block of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described below with reference to the accompanying drawings:

[0020] Referring to the attached drawings: This safety circuit breaker includes a circuit breaker body, which includes a housing 1, a closing assembly, an arc extinguishing assembly, and an overload protection mechanism disposed within the housing 1. The closing assembly includes a moving contact 21, a static contact 22, and a terminal 23. The arc extinguishing assembly includes an arc guiding plate 31, a plurality of arc splitting grooves 32, a plurality of arc extinguishing grids 33, and a plurality of arc spraying outlets 34. The arc spraying outlets 34 are respectively located at positions slightly above the middle, in the middle, and slightly below the middle of the housing 1. A first arc splitting plate 4 and a second arc splitting plate 5 are disposed within the housing 1 on one side of the arc outlet formed by the arc extinguishing grids 33 and having an arc traveling distance. The first arc splitting plate 4 guides the arc towards the arc spraying outlets 34 located at positions slightly above the middle and in the middle, and the second arc splitting plate 5 guides the arc towards the arc spraying outlet 34 located at the position slightly below the middle. The principle of the present utility model lies in that the first arc splitting plate 4 and the second arc splitting plate 5 are disposed at a position on one side of the arc extinguishing grids 33 within the housing 1. The first arc splitting plate 4 is used to guide the arc flowing out of the arc extinguishing assembly towards the arc spraying outlets 34 located at positions slightly above the middle and in the middle. This can provide a clear direction for the flowing arc, prevent the arc from moving aimlessly, reduce the time for the arc to reach the upper arc spraying outlet and the middle arc spraying outlet, improve the efficiency of the arc being discharged, achieve a rapid reduction in internal pressure, improve safety, and the first arc splitting plate 4 can also serve as the side enclosure of the cavity of the terminal 23 (located at the arc spraying outlet 34), so that the layout of each cavity formed on the housing 1 does not need to be changed.

[0021] The first arc splitting plate 4 includes a first transverse introduction section 41 that defines a guiding direction and two longitudinal lead-out sections 42 distributed vertically. The two longitudinal lead-out sections 42 are distributed in a left-right staggered manner. The first transverse introduction section 41 is disposed at the middle position between the two longitudinal lead-out sections 42 to form two guiding trajectories that guide in different directions and match the arc spraying outlets 34 located at positions slightly above the middle and in the middle. Such a setting can obtain two guiding trajectories that guide in different directions, that is, one guiding trajectory is used to guide the arc towards the arc spraying outlet 34 located at the position slightly above the middle, and the other guiding trajectory is used to guide the arc towards the arc spraying outlet 34 located at the middle position, so as to meet the requirement that the first arc splitting plate 4 can be used to guide the arc to the arc spraying outlets 34 at two different positions. At the same time, the first transverse introduction section 41 is located at the outlet formed by the arc extinguishing grids 33, so that the arc flowing out of the arc extinguishing assembly can be guided by the first transverse introduction section 41 in the first time. In this embodiment, the front end surfaces of the first transverse introduction section 41 and the upper longitudinal lead-out section 42 serve as the edges of the guiding trajectory for guiding the arc towards the arc spraying outlet 34 located at the position slightly above the middle, and the rear end surfaces of the first transverse introduction section 41 and the lower longitudinal lead-out section 42 serve as the edges of the guiding trajectory for guiding the arc towards the arc spraying outlet 34 located at the middle position.

[0022] A first turning guide section 43 is provided between the first horizontal introduction section 41 and the upper longitudinal extraction section 42, and also between the first horizontal introduction section 41 and the lower longitudinal extraction section 42, so as to guide the arc through the first turning guide section 43 in the turning guide direction from the first horizontal introduction section 41 to the upper longitudinal extraction section 42 and the lower longitudinal extraction section 42. The first turning guide section 43 is used to connect the first horizontal introduction section 41 and the upper longitudinal extraction section 42, and is also used to connect the first horizontal introduction section 41 and the lower longitudinal extraction section 42, so that the first horizontal introduction section 41 and the upper longitudinal extraction section 42, and the first horizontal introduction section 41 and the lower longitudinal extraction section 42 are continuous in terms of guidance.

[0023] The second arc splitting plate 5 includes a second horizontal introduction section 51, a horizontal extraction section 52, and an intermediate guide section 53 that define a guide direction. An included angle A exists between the second horizontal introduction section 51 and the intermediate guide section 53, and between the horizontal extraction section 52 and the intermediate guide section 53, and A = 105°, so as to match the arc spraying outlet 34 at a position slightly lower than the middle. Such a setting can guide the arc to the arc spraying outlet 34 at a position slightly lower than the middle. The second horizontal introduction section 51 is located at the outlet formed by the arc extinguishing grid plates 33, so that the arc flowing out of the arc extinguishing assembly can be guided by the second horizontal introduction section 51 immediately. The oblique setting of the intermediate guide section 53 enables the horizontal extraction section 52 to be closer to the arc spraying outlet 34 at a position slightly lower than the middle by using the included angle. In this way, the arc can also be near the arc spraying outlet 34 after breaking away from the guidance, thereby improving the arc discharging efficiency. In this embodiment, there are two arc spraying outlets 34 at a position slightly lower than the middle, one is located on the side of the housing 1, and the other is located at the lower end of the housing 1. Therefore, the front end faces of the second horizontal introduction section 51, the horizontal extraction section 52, and the intermediate guide section 53 are used as the edges of the guiding track for guiding to the arc spraying outlet 34 on the side, and the rear end faces of the second horizontal introduction section 51, the horizontal extraction section 52, and the intermediate guide section 53 are used as the edges of the guiding track for guiding to the arc spraying outlet 34 at the lower end.

[0024] Second turning guide sections 54 are provided between the second horizontal introduction section 51 and the intermediate guide section 53, and between the horizontal extraction section 52 and the intermediate guide section 53, so as to guide the arc through the second turning guide sections 54 in the turning guide direction from the second horizontal introduction section 51 to the intermediate guide section 53, and from the intermediate guide section 53 to the horizontal extraction section 52. Such a setting has the same function as that of the first arc splitting plate 4, that is, to make the second horizontal introduction section 51, the intermediate guide section 53, and the horizontal extraction section 52 continuous in terms of guidance.

[0025] Both the first turning guide section 43 and the second turning guide section 54 are in an arc configuration, and the arc configuration enables the arc to be guided quickly and smoothly when turning.

[0026] One side of the second arc segment plate 5 is provided with a guiding block 6 disposed inside the housing 1 and close to the lateral lead-out segment 52. The guiding block 6 is used to guide the arc towards the arc spraying outlet 34 or the lateral lead-out segment 52 at a position slightly lower than the middle. Such a setting is considered because there is a relatively large space between the second arc segment plate 5 and the lower enclosure forming the cavity for the terminal 23 to be placed inside. The large space results in a large capacity of the arc entering, which will cause the arc in this space but far from the second arc segment plate 5 not to be guided. Therefore, the guiding block 6 is provided to guide the unguided arc towards the arc spraying outlet 34 or the lateral lead-out segment 52 at a position slightly lower than the middle, so as not to affect the voltage reduction due to space problems.

[0027] The guiding block 6 includes a first pointing segment 61 and a second pointing segment 62. The first pointing segment 61 is inclined and points to the arc spraying outlet 34. The second pointing segment 62 has an included angle B with the first pointing segment 61 and points to the lateral lead-out segment 52, and B = 65°. Such a setting can guide the unguided arc towards the arc spraying outlet 34 or the lateral lead-out segment 52 at a position slightly lower than the middle. That is, the first pointing segment 61 is inclined, which can clearly point to the arc spraying outlet 34. The second pointing segment 62 is vertically arranged and forms a perpendicular setting with the lateral lead-out segment 52, so as to reach the lateral lead-out segment 52 under the guidance of the second pointing segment 62.

[0028] Although the present utility model has been illustrated and described by referring to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details can be made within the scope of the claims.

Claims

1. A safety circuit breaker, comprising a circuit breaker body, the circuit breaker body comprising a housing (1), and a closing assembly, an arc extinguishing assembly, and an overload protection mechanism arranged in the housing (1), the closing assembly comprising a moving contact (21), a stationary contact (22), and a terminal (23), the arc extinguishing assembly comprising an arc striking plate (31), a plurality of arc dividing grooves (32), a plurality of arc extinguishing grids (33), and a plurality of arc spraying outlets (34), characterized in that: The arc spray outlets (34) are respectively located at the upper middle, the middle, and the lower middle positions of the housing (1). The housing (1) is provided with a first arc splitter plate (4) and a second arc splitter plate (5) located at one side of the arc outlet formed by the arc extinguishing grid (33) and having an arc running distance. The first arc splitter plate (4) guides the arc to the arc spray outlets (34) located at the upper middle and the middle positions, and the second arc splitter plate (5) guides the arc to the arc spray outlet (34) located at the lower middle position.

2. The safety circuit breaker according to claim 1, characterized in that: The first arc splitting plate (4) comprises a first transverse lead-in section (41) defining a guide direction, and two longitudinal lead-out sections (42) distributed up and down, the two longitudinal lead-out sections (42) being staggered left and right, the first transverse lead-in section (41) being arranged at a central position between the two longitudinal lead-out sections (42) to form two guide tracks directed in different directions and matching the arc spray outlets (34) located at the upper middle and middle positions.

3. The safety circuit breaker according to claim 2, characterized in that: A first turning guide section (43) is provided between the first transverse introduction section (41) and the longitudinal lead-out section (42) located above, and between the first transverse introduction section (41) and the longitudinal lead-out section (42) located below, so as to guide the arc through the first turning guide section (43) from the first transverse introduction section (41) to the longitudinal lead-out section (42) located above and the longitudinal lead-out section (42) located below.

4. The safety circuit breaker according to claim 3, characterized in that: The second arc splitting plate (5) comprises a second lateral introduction section (51) defining a guide direction, a lateral lead-out section (52), and an intermediate guide section (53) connecting the second lateral introduction section (51) and the intermediate guide section (53), and an angle A of 105° is formed between the second lateral introduction section (51) and the intermediate guide section (53), so as to match the arc spray outlet (34) located at a lower middle position.

5. The safety circuit breaker according to claim 4, characterized in that: A second turning guide section (54) is provided between the second transverse lead-in section (51) and the intermediate guide section (53), and between the transverse lead-out section (52) and the intermediate guide section (53), so as to guide the arc through the second turning guide section (54) in a turning guide direction from the second transverse lead-in section (51) to the intermediate guide section (53), and from the intermediate guide section (53) to the transverse lead-out section (52).

6. The safety circuit breaker according to claim 5, characterized in that: The first turning guide section (43) and the second turning guide section (54) are both in an arc configuration.

7. The safety circuit breaker according to claim 4, characterized in that: One side of the second arc splitting plate (5) has a guide block (6) disposed in the housing (1) and close to the lateral lead-out section (52), the guide block (6) being used to guide the arc toward the arc spray outlet (34) located at a lower middle position or the lateral lead-out section (52).

8. The safety circuit breaker according to claim 7, characterized in that: The guide block (6) comprises a first pointing section (61) and a second pointing section (62), the first pointing section (61) being arranged at an angle and pointing towards the arc spray outlet (34), the second pointing section (62) having an included angle B with the first pointing section (61) and pointing towards the lateral lead-out section (52), where B=65°.

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