Circuit breaker housing, arc extinguishing device and circuit breaker

Abstract

The present invention discloses a circuit breaker housing, an arc extinguishing device and a circuit breaker. The circuit breaker housing comprises: the inner surface of the circuit breaker housing is provided with a plurality of spaced convex portions, and the arrangement area of ​​the convex portions is adjacent to the location of the static contact. The convex portions are arranged to form a plurality of radiating lines drawn from a center of a circle, wherein the center of the circle is adjacent to the location of the static contact. The space formed by the intervals between the convex portions constitutes an arc-striking runway, one end of the arc-striking runway is adjacent to the static contact, and the other end is adjacent to the arc-extinguishing chamber. The convex portions are arranged to form a plurality of arc-shaped lines arranged side by side, one end of the arc-shaped lines is adjacent to the static contact, and the other end is adjacent to the arc-extinguishing chamber. The convex portions increase the thickness of the circuit breaker housing, and the housing can be prevented from being punctured without using an arc-isolating plate under low current conditions, and the arc-isolating function can be achieved together with the arc-isolating plate under high current conditions. The convex portions can further play a role in guiding the arc to the arc-extinguishing chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit control, and in particular to a circuit breaker housing, an arc extinguishing device and a circuit breaker. Background Art

[0002] In order to ensure the safety of users' electricity use, circuit breakers are usually installed in power supply systems as protective devices. During the circuit breaker disconnection process, the contact area has an extremely high temperature, and the thermal current and arc reflection phenomenon are obvious. Generally, arc isolation plates are installed in the vicinity to prevent the arc from penetrating the circuit breaker casing.

[0003] The problem with the prior art is that arc isolation plates need to be provided regardless of high current or low current conditions, resulting in high manufacturing costs and time-consuming installation. Summary of the invention

[0004] The purpose of the present invention is to provide a circuit breaker housing, an arc extinguishing device and a circuit breaker. The circuit breaker housing also has an arc isolation function and does not need to use an arc isolation plate under low current conditions.

[0005] The technical solution provided by the present invention is as follows: a circuit breaker housing capable of isolating arcs, wherein a plurality of spaced-apart convex portions are arranged on the inner surface of the circuit breaker housing, and an arrangement area of ​​the convex portions is adjacent to a location of a stationary contact.

[0006] In this technical solution, the convex part increases the thickness and strength of the circuit breaker housing, and can prevent the housing from being punctured without using an arc isolation plate under low current conditions. Under high current conditions, the arc isolation function can be achieved together with the arc isolation plate, which is safe and reliable. On the other hand, during the disconnection process of the moving and static contacts, the surface temperature of the contacts increases sharply, and a high electric field is formed in the air gap between the contacts. Under the action of the electric field, the energy wave accelerates the collision of neutral gas molecules and makes them free. The spaced convex part structure divides them to form a short arc in series, which increases the arc resistance and provides a channel for the arc to be guided, thereby reducing the burning of the arc.

[0007] Preferably, the convex portions are arranged to form a plurality of radiating lines extending from a center of a circle, wherein the center of the circle is adjacent to the location of the stationary contact.

[0008] In this technical solution, the radiation lines are led out from the area where the arc is generated, which is adapted to the conduction trajectory of the arc, providing a channel for the arc to be guided, thereby preventing the arc from penetrating the shell.

[0009] Preferably, the space formed by the intervals between the protrusions constitutes an arc-striking track, one end of the arc-striking track is adjacent to the static contact, and the other end is adjacent to the arc-extinguishing chamber.

[0010] In the technical solution, the convex portion further plays a role in guiding the arc to the arc extinguishing chamber.

[0011] Specifically, the convex portions are arranged to form a plurality of arc-shaped lines arranged side by side, one end of the arc-shaped line is adjacent to the static contact, and the other end is adjacent to the arc-extinguishing chamber.

[0012] Specifically, the farther from the center of the circle, the larger the radial dimension of the convex portion.

[0013] Specifically, the convex portion is a cylindrical structure.

[0014] The present invention also discloses a circuit breaker housing capable of isolating arcs, comprising:

[0015] The circuit breaker base is used to install the internal components of the circuit breaker, and

[0016] The circuit breaker cover is buckled and fixed on the circuit breaker base; wherein,

[0017] The protrusion is arranged on the circuit breaker base and / or the circuit breaker cover.

[0018] The present invention also discloses an arc extinguishing device for a circuit breaker, comprising:

[0019] The protrusion is arranged on the circuit breaker housing.

[0020] Interrupter, and

[0021] The baffle is located on the four sides of the convex arrangement area.

[0022] Preferably, an arc isolation plate is stacked above the convex portion.

[0023] A circuit breaker comprises the aforementioned circuit breaker housing or the aforementioned arc extinguishing device.

[0024] A circuit breaker housing, an arc extinguishing device and a circuit breaker provided by the present invention can bring at least one of the following beneficial effects:

[0025] 1. The convex part increases the thickness of the circuit breaker casing. Under low current conditions, the casing can be prevented from being punctured without the use of an arc-isolating plate. Under high current conditions, the arc-isolating plate can be used together with the arc-isolating plate to achieve the arc-isolating function.

[0026] 2. The spaced-apart convex structure divides the arc into short arcs that are partially connected in series, thereby increasing the arc resistance and providing a channel for the arc to be diverted, thereby reducing the burning of the arc.

[0027] 3. The convex portion can further guide the arc to the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings, and the above-mentioned characteristics, technical features, advantages and implementation methods of the circuit breaker housing, arc extinguishing device and circuit breaker will be further described.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the base.

[0030] Figure 2 yes Figure 1 Schematic diagram of the local structure of the convex area.

[0031] Figure 3 It is a schematic diagram of the structure after the internal components are installed in the base.

[0032] Explanation of the accompanying drawings: 100, base, 110, handle, 120, protrusion, 121, arc striking track, 130, slot, 131, static contact clamping column, 200, arc extinguishing chamber, 210, baffle, 220, arc isolation plate, 230, arc striking plate, 300, moving contact, 310, static contact, 400, linkage mechanism, 510, electromagnetic tripping device, 520, thermal tripping device. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0034] In order to simplify the drawings, each figure only schematically shows the parts related to the present invention, which do not represent the actual structure of the product.

[0035] Embodiment 1

[0036] Reference Figure 1 and Figure 2 As shown, this embodiment discloses a circuit breaker housing capable of isolating arcs.

[0037] The inner surface of the circuit breaker housing is provided with a plurality of spaced convex portions 120. The convex portions 120 are arranged in an area close to the location of the static contact, i.e., the location where the arc is generated. Figure 1 and Figure 2 The convex portion 120 is preferably a cylindrical structure.

[0038] It should be noted that the circuit breaker housing includes a circuit breaker base 100 and a circuit breaker cover, the circuit breaker cover is buckled on the circuit breaker base, and the internal components of the circuit breaker are accommodated between the circuit breaker base and the circuit breaker cover. The protrusion 120 is arranged on the circuit breaker base and the circuit breaker cover. Figure 1The component shown in the figure is a circuit breaker base. If the protrusion 120 is arranged on the circuit breaker base and the circuit breaker cover at the same time, the arrangement position of the protrusion 120 on the circuit breaker cover corresponds to that on the circuit breaker base.

[0039] On the one hand, the convex part 120 increases the thickness of the circuit breaker housing, and the housing can be prevented from being punctured without using the arc isolation plate 220 under low current conditions, and the arc isolation function can be achieved together with the arc isolation plate 220 under high current conditions. On the other hand, in the process of disconnection of the moving and static contacts, the surface temperature of the contacts increases sharply, and a high electric field is formed in the air gap between the contacts. Under the action of the electric field, the energy wave accelerates the collision of neutral gas molecules and makes them free. The spaced convex part structure divides them to form a short arc connected in series, which increases the arc resistance and provides a channel for the arc to be diverted, thereby reducing the burning of the arc.

[0040] For example, Figure 2 As shown, the convex parts 120 are arranged to form a plurality of radiating lines extending from a circle center, wherein the circle center is close to the position of the static contact. The radiating lines are extended from the arc generating area, adapted to the arc conduction track, and provide a channel for the arc to be guided, thereby preventing the arc from breaking through the housing.

[0041] Reference Figure 1-Figure 3 As shown in , the protrusion 120 can be further arranged to form a plurality of arc lines arranged side by side, one end of the arc line is adjacent to the static contact, and the other end is adjacent to the arc extinguishing chamber 200. The arc extinguishing chamber generally includes a grid structure installed on the slot 130. At this time, the intervals between the arc lines form an arc striking track 121 that guides the arc from the static contact to the arc extinguishing chamber. Of course, the arc striking track can also be realized by other shapes besides the arc lines arranged side by side. In addition, as Figure 3 As shown, an arc-starting plate 230 is further provided outside the lower edge of the area where the convex portion 120 is arranged, which can further play an arc-starting role. For example, the radial dimension of the convex portion 120 is larger as it is farther from the center of the circle.

[0042] Embodiment 2

[0043] like Figure 1 As shown, the present invention also discloses an arc extinguishing device for a circuit breaker, comprising: an arc extinguishing chamber 200, a baffle 210, and the convex portion 120 described in the first embodiment. The convex portion 120 is arranged on the circuit breaker housing, the baffle 210 is located around the convex portion 120 arrangement area, and the arc extinguishing chamber 200 is adjacent to the convex portion 120 arrangement area.

[0044] More preferably, refer to Figure 3As shown, an arc isolation plate 220 is stacked on the convex portion 120. The arc isolation plate 220 and the convex portion 120 can both isolate the arc and prevent the circuit breaker housing from being punctured. Therefore, under low current conditions, the arc isolation plate 220 structure can be removed to achieve the same function.

[0045] This embodiment also discloses a circuit breaker, including the circuit breaker housing of the first embodiment or the arc extinguishing device of this embodiment.

[0046] For example, Figure 3 As shown, the mechanism of the miniature circuit breaker includes a circuit breaker housing 100, a handle 110, a linkage mechanism 400, an arc extinguishing chamber 200 and a tripping device.

[0047] The circuit breaker housing 100 is provided with a stationary contact 310 and a moving contact 300 arranged opposite to each other. As described in the above-mentioned embodiment, the inner surface of the circuit breaker housing is provided with a plurality of spaced protrusions 120. The handle 110 is pivotally mounted on the circuit breaker housing. The linkage mechanism 400 is connected between the handle and the moving contact, and connects and disconnects the moving contact and the stationary contact 310 in response to the pivoting action of the handle. The trip device detects the excess current flowing between the moving contact and the stationary contact 310, and the trip device operates the linkage mechanism in response to the excess current, so that the linkage mechanism drives the moving contact and the stationary contact to disconnect. It includes an electromagnetic trip device 510 and a thermal trip device 520.

[0048] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A circuit breaker housing capable of isolating arcs, characterized in that: The inner surface of the circuit breaker housing is provided with a plurality of spaced-apart protrusions, and the plurality of protrusions form a multi-row, multi-column, and multi-point arrangement. The arrangement area of ​​the protrusions is adjacent to the location of the stationary contact.

2. The arc-isolating circuit breaker housing according to claim 1, characterized in that: The convex parts are arranged to form a plurality of radiating lines extending from a circle center, wherein the circle center is adjacent to the location of the stationary contact.

3. The arc-isolating circuit breaker housing according to claim 1, characterized in that: The space formed by the intervals between the protrusions constitutes an arc-striking track, one end of which is adjacent to the static contact, and the other end of which is adjacent to the arc-extinguishing chamber.

4. The arc-isolating circuit breaker housing according to claim 2 or 3, characterized in that: The convex parts are arranged to form a plurality of arc lines arranged side by side, one end of the arc line is adjacent to the static contact, and the other end is adjacent to the arc extinguishing chamber.

5. The arc-isolating circuit breaker housing according to claim 2, characterized in that: The farther away from the center of the circle, the larger the radial dimension of the convex portion.

6. The arc-isolating circuit breaker housing according to claim 1, characterized in that: The convex part is a cylindrical structure.

7. The arc-isolating circuit breaker housing according to claim 1, characterized in that: include: The circuit breaker base is used to install the internal components of the circuit breaker, and The circuit breaker cover is buckled and fixed on the circuit breaker base; wherein, The protrusion is arranged on the circuit breaker base and the circuit breaker cover.

8. An arc extinguishing device for a circuit breaker, characterized in that: include: The protrusion according to any one of claims 1 to 7 is arranged on the housing of the circuit breaker, Interrupter, and The baffle is located on the four sides of the convex arrangement area.

9. The arc extinguishing device of the circuit breaker according to claim 8, characterized in that: An arc isolation plate is stacked above the convex portion.

10. A circuit breaker, characterized in that: It comprises a circuit breaker housing as described in any one of claims 1 to 7 or an arc extinguishing device as described in claim 8 or 9.

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