Exhaust channel of circuit breaker

Abstract

According to the exhaust channel of the circuit breaker, breaking arcs are extinguished through arc extinguishing grid pieces in an arc extinguishing chamber and then are exhausted from an exhaust port in a shell through the exhaust channel, the exhaust channel is arranged on at least one side wall, corresponding to the arc extinguishing grid pieces in the arc extinguishing chamber, of the shell, and notches are formed in the positions, corresponding to the exhaust channel, of the arc extinguishing grid pieces in the arc extinguishing chamber in a staggered mode. The exhaust channel is arranged on the side surface of the shell for exhausting, so that arc ions are exhausted from the side surface of the arc extinguishing grid plate to the flow channel, the arc short circuit is avoided, the pressure maintaining effect is achieved, meanwhile, the mounting space can be better utilized to increase the belly length of the grid plate, so that the grid plate has higher heat capacity, and the arc can be better broken in high-voltage work; in addition, the front and back of the arc extinguish chamber adopt two air outlets, thereby facilitating uniform air outlet of the arc. Staggered notches at the back of the arc-extinguishing grid plate can enable electric arc to be broken down at the belly of the grid plate, and meanwhile, the capacity of an air cavity in the arc-extinguishing chamber is increased, and grid plate fusion caused by excessive metal particles is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and particularly relates to an exhaust passage of a circuit breaker. Background Art

[0002] A circuit breaker is an important part of a power distribution system, mainly used in industrial low-voltage power systems to connect and disconnect the current in the power grid circuit and protect the line and power supply equipment from the hazards of overload, undervoltage, short circuit, single-phase grounding and other faults. The function of the circuit breaker to break the overload or short-circuit current is mainly completed by an operating system, an electromagnetic system, a contact system and an arc extinguishing system installed in the circuit breaker. When a fault current appears in the circuit and the current value exceeds the set value range, the operating mechanism is driven to act, so that the moving and static contacts of the circuit breaker are quickly disconnected. At this time, the voltage between the moving and static contacts causes the air medium to discharge, thus generating a high-temperature arc. During the combustion process of the arc, the air temperature in the arc extinguishing device rises sharply, thereby accelerating the ionization of the air. On the other hand, under the promotion of the magnetic field and fluid effect in the arc extinguishing chamber, the arc is separated into multiple short arcs by multiple arc separating grids, and the deionization effect of the arc is strengthened by the metal arc separating plates. The arc becomes smaller and the voltage rises rapidly, so that the arc is extinguished. To improve the arc extinguishing performance of the arc extinguishing chamber, generally, the arc is required to quickly enter the arc separating grids in the arc extinguishing chamber through the arc passage, so that the grids can effectively cut the arc, thereby achieving the goal of quickly extinguishing the arc, and then quickly discharging through the exhaust passage from the circuit breaker housing. The existing small circuit breaker products all have the air outlet form of back air outlet. When the arc separating grids are extended and the air outlet is on both sides, the arc is prone to short-circuit on both sides of the arc separating grids and the arc separating grids are fused together, resulting in a decrease in the arc extinguishing ability of the arc extinguishing chamber. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an exhaust passage of a circuit breaker aiming at the phenomenon that the existing small circuit breaker products have back air outlet and the arc is prone to short-circuit on both sides of the arc separating grids and the arc separating grids are fused together. The exhaust passage is arranged on the side wall of the housing, the arc is easy to discharge, and at the same time, the phenomenon that the arc separating grids are fused together due to too many metal particles can be avoided.

[0004] Technical Solution

[0005] In order to achieve the above technical purpose, the utility model provides an exhaust passage of a circuit breaker. After the interrupted arc is extinguished by the arc separating grids in the arc extinguishing chamber, it is discharged from the exhaust port on the housing through the exhaust passage. It is characterized in that: the exhaust passage is arranged at least on one side wall of the housing corresponding to the arc separating grids in the arc extinguishing chamber, and notches are arranged alternately at the corresponding positions of the arc separating grids in the arc extinguishing chamber and the exhaust passage.

[0006] In one of the embodiments, exhaust passages are arranged on both side walls of the housing.

[0007] In one embodiment, the notch is square.

[0008] In one embodiment, a rhombic or circular flow guiding feature is provided in the exhaust passage.

[0009] Advantageous Effects

[0010] The present utility model provides an exhaust passage for a circuit breaker. After the arc is extinguished by the arc extinguishing grid in the arc extinguishing chamber, it is discharged from the exhaust port on the housing through the exhaust passage. The exhaust passage is provided at least on one side wall of the housing corresponding to the arc extinguishing grid in the arc extinguishing chamber, and notches are staggeredly arranged at the corresponding positions between the arc extinguishing grid in the arc extinguishing chamber and the exhaust passage. The exhaust passage is arranged on the side of the housing to allow the arc ions to flow out from the side of the arc extinguishing grid, avoiding arc short circuit and achieving a pressure maintaining effect. At the same time, the installation space can be better utilized to increase the length of the abdomen of the grid, so that the grid has a higher heat capacity and can better extinguish the arc under high voltage operation. In addition, the structure with two exhaust ports at the front and back of the arc extinguishing chamber is beneficial for the uniform discharge of the arc. The staggered notches behind the arc extinguishing grid can cause the arc to break through in the abdomen of the grid, while increasing the internal gas cavity capacity of the arc extinguishing chamber and avoiding the grid from being fused due to excessive metal particles. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0012] Att Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0013] Att Figure 2 is a schematic diagram of the exhaust passage in an embodiment of the present utility model.

[0014] Att Figure 3 is a schematic structural diagram of the arc extinguishing grid in an embodiment of the present utility model Figure 1 .

[0015] Att Figure 4 is a schematic structural diagram of the arc extinguishing grid in an embodiment of the present utility model Figure 2 . Detailed Embodiments

[0016] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0017] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of this application are only for the purpose of illustration and do not represent the only implementation.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0019] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0020] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the description of this application includes any and all combinations of one or more of the related listed items.

[0021] Embodiment

[0022] As shown in the attached Figure 1 and 2As shown, an exhaust passage of a circuit breaker. After the interrupted arc is extinguished by the arc extinguishing grid 2 in the arc extinguishing chamber 1, it is discharged from the exhaust port on the housing 4 through the exhaust passage 3. The exhaust passage 3 is arranged at least on one side wall of the housing 4 corresponding to the arc extinguishing grid 2 in the arc extinguishing chamber 1. A rhombic or circular flow guiding feature is arranged in the exhaust passage 3, and the air outlet adopts a lateral air outlet so that the arc ions flow out from the lateral flow path of the arc extinguishing grid, avoiding arc short circuit and achieving a pressure maintaining effect. At the same time, the installation space can be better utilized to increase the length of the abdomen of the grid, so that the grid has a higher heat capacity and can better interrupt the arc under high voltage operation;

[0023] As shown in the appendix Figure 3 and 4 As shown, notches 201 are staggered at the corresponding positions of the arc extinguishing grid 2 in the arc extinguishing chamber 1 and the exhaust passage 3. The notches 201 are arranged in a staggered manner on both sides. Additionally, due to the action of the staggered notches 201, the arc will be restricted within the abdomen of the arc extinguishing grid 2 near the notches, so that the arc can stay in the abdomen of the arc extinguishing grid 2. The notches 201 of the arc extinguishing grid 2 increase the internal gas cavity capacity of the arc extinguishing chamber 1, avoiding the fusion of the arc extinguishing grid 2 due to excessive metal particles. In this embodiment, exhaust passages 3 are arranged on both side walls of the housing 4 to facilitate the uniform discharge of the arc; the notch 201 is preferably square. And due to different air pressures, notches of different sizes can be correspondingly adopted. By adopting notches 201 of different sizes, the actual exhaust passage size can be changed to change the air pressure. Additionally, according to the position of the arc extinguishing grid that is prone to fusion in practice, the shape and size of the notch 201 behind the arc extinguishing grid can be further adjusted. Such a structure can increase the cross-sectional area of the air passage and is beneficial to gas discharge.

[0024] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0025] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An exhaust passage of a circuit breaker, wherein the arc is extinguished after passing through an arc extinguishing grid (2) in an arc extinguishing chamber (1) and then discharged from an exhaust port on a housing (4) through an exhaust passage (3), characterized in that: The exhaust channel (3) is arranged at least on one side wall of a housing (4) corresponding to the arc extinguishing grid (2) in the arc extinguishing chamber (1), and gaps (201) are alternately arranged at locations corresponding to the arc extinguishing grid (2) in the arc extinguishing chamber (1) and the exhaust channel (3).

2. The exhaust passage of a circuit breaker according to claim 1, characterized in that: Exhaust channels (3) are provided on both side walls of the housing (4).

3. The exhaust passage of a circuit breaker according to claim 1, characterized in that: The notch (201) is square.

4. The exhaust passage of a circuit breaker according to claim 1, characterized in that: A prismatic or circular flow-guiding feature is provided in the exhaust passage (3).

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