Breaker exhaust channel structure

Abstract

An exhaust passage structure of a circuit breaker is characterized in that an electric arc is extinguished by an arc extinguishing grid sheet in an arc extinguishing chamber and then is exhausted from an exhaust port on a shell through an exhaust passage, the exhaust passage is arranged on at least one side surface of the shell corresponding to the arc extinguishing grid sheet in the arc extinguishing chamber, and the arc extinguishing chamber and the exhaust passage are separated by an insulating part. Air holes are formed in the positions, corresponding to gaps between the adjacent arc extinguishing grid pieces, of the insulating part, and gas formed by electric arcs extinguished by the arc extinguishing grid pieces in the arc extinguishing chamber enters the exhaust channel from the gaps between the adjacent arc extinguishing grid pieces through the air holes and then is exhausted out of the shell. The exhaust channel is arranged on the side face of the shell, the air channel and the arc extinguishing chamber are separated through the insulating plate, arc short circuit is avoided, the pressure maintaining effect is achieved, and meanwhile the situation that the grid pieces are fused and connected due to adhesion of metal particles is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to an exhaust structure of an arc extinguishing chamber of a circuit breaker. Background Art

[0002] The function of a circuit breaker to interrupt overloaded or short-circuit currents 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 sheets. The arc becomes smaller and the voltage rises rapidly, causing the arc to extinguish. To improve the arc extinguishing performance of the arc extinguishing chamber, generally, the arc should be quickly introduced into the arc separating grids of the arc extinguishing chamber through the arc channel, 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 channel out of 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 air outlets are arranged on both sides, the arc is likely to be short-circuited 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.

[0003] Chinese Patent CN1445807 A discloses a circuit breaker including two contacts arranged in a breaking space, the breaking space is defined by a nozzle and contains a dielectric gas, the circuit breaker further includes a hot air blowing chamber, which is communicated with the breaking space through a throat of the nozzle and is communicated with an expansion space through an exhaust channel adapted to be closed by a valve. When the pressure in the hot air blowing chamber exceeds a specific critical value, the valve opens to discharge the pressurized gas from the chamber. The circuit breaker is characterized in that the exhaust channel is formed in the nozzle and defines an annular volume within the thickness of the nozzle, adopts its general shape, and opens towards the expansion space downstream of the breaking space relative to the throat. This circuit breaker completes gas discharge through the opening and closing of the valve, but the arc is still likely to be short-circuited 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

[0004] The content of the present utility model aims at the defects that the arc is prone to short - circuit on both sides of the arc - extinguishing grid plates and the arc - extinguishing grid plates are fused together, resulting in the decline of the arc - extinguishing ability of the arc - extinguishing chamber. A circuit breaker exhaust passage structure is provided. The exhaust passage is arranged on the side surface of the housing. The air passage and the arc - extinguishing chamber are separated by an insulating plate to avoid arc short - circuit and achieve a pressure - maintaining effect. At the same time, the grid plates are prevented from being fused together due to the adhesion of metal particles.

[0005] Technical solution

[0006] In order to achieve the above - mentioned technical purpose, the present utility model provides a circuit breaker exhaust passage structure. After the arc is extinguished by the arc - extinguishing grid plates 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 surface of the housing corresponding to the arc - extinguishing grid plates in the arc - extinguishing chamber. The arc - extinguishing chamber and the exhaust passage are separated by an insulating member. Air holes are arranged at positions corresponding to the gaps between adjacent arc - extinguishing grid plates on the insulating member. The gas formed by the arc extinguished by the arc - extinguishing grid plates in the arc - extinguishing chamber enters the exhaust passage through the gaps between adjacent arc - extinguishing grid plates and the air holes and is then discharged outside the housing.

[0007] In one of the embodiments, the exhaust passage is arranged on the inner side surfaces of both sides of the housing corresponding to the arc - extinguishing grid plates in the arc - extinguishing chamber.

[0008] In one of the embodiments, an insulating member one is arranged on the plug - in housing. The plug - in housing is inserted into the housing from the bottom of the housing. An exhaust passage one is formed between the plug - in housing and the inner side surface of the housing. The gas formed by the arc extinguished by the arc - extinguishing grid plates in the arc - extinguishing chamber enters the exhaust passage one through the gaps between adjacent arc - extinguishing grid plates and the air holes one on the insulating member one and is then discharged outside the housing.

[0009] In one of the embodiments, air holes two are arranged on the side surface of the housing. The air holes two correspond to the gaps between adjacent arc - extinguishing grid plates. A groove is arranged on the outer side surface of the housing where the air holes two are located. A cover plate is installed on the groove to form an exhaust passage two.

[0010] In one of the embodiments, a support member is arranged in the housing in the area where the arc - extinguishing chamber exhausts. The support member is provided with an inner groove on one side of the arc - extinguishing grid plates in the arc - extinguishing chamber. The inner groove and the corresponding inner surface of the housing form an exhaust passage three. Air holes three are arranged at positions corresponding to the gaps between the bottom of the inner groove and adjacent arc - extinguishing grid plates. The gas formed by the arc extinguished by the arc - extinguishing grid plates in the arc - extinguishing chamber enters the exhaust passage three through the gaps between adjacent arc - extinguishing grid plates 1 and the air holes three on the support member and is then discharged outside the housing.

[0011] In one of the embodiments, the support member is installed on both sides of the bottom of the arc - extinguishing chamber.

[0012] In one of the embodiments, exhaust ports are provided on both sides of the bottom of the housing.

[0013] Beneficial effects

[0014] The present utility model provides a circuit breaker exhaust passage structure. After the arc is extinguished by the arc extinguishing grid in the arc extinguishing chamber 1, it is discharged from the exhaust port on the housing through the exhaust passage. The exhaust passage is provided at least on one side surface of the housing corresponding to the arc extinguishing grid in the arc extinguishing chamber 1. The arc extinguishing chamber and the exhaust passage are separated by an insulating member. Air holes are provided at positions corresponding to the gaps between adjacent arc extinguishing grids on the insulating member. The gas formed by the arc extinguished by the arc extinguishing grids in the arc extinguishing chamber enters the exhaust passage through the gaps between adjacent arc extinguishing grids and the air holes and is then discharged outside the housing. The exhaust passage is provided on the side surface of the housing. The air passage and the arc extinguishing chamber are separated by an insulating plate to avoid arc short circuit and achieve a pressure maintaining effect. At the same time, it avoids the grid melting due to the adhesion of metal particles. Brief description of the drawings

[0015] 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 for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0016] Attached Figure 1 is a schematic diagram of the exhaust passage in Embodiment 1 of the present utility model.

[0017] Attached Figure 2 is a schematic diagram of the air outlet in Embodiment 1 of the present utility model.

[0018] Attached Figure 3 is a schematic diagram of the exhaust passage in Embodiment 2 of the present utility model.

[0019] Attached Figure 4 is a schematic diagram of the plug-in housing structure in Embodiment 2 of the present utility model.

[0020] Attached Figure 5 is a schematic diagram of the exhaust passage in Embodiment 3 of the present utility model.

[0021] Attached Figure 6 is a schematic diagram of the support member installation structure in Embodiment 3 of the present utility model.

[0022] Attached Figure 7 is a schematic diagram of the support member structure in Embodiment 3 of the present utility model.

[0023] Attached Figure 8 is a schematic diagram of the housing structure in Embodiment 3 of the present utility model.

[0024] Appendix Figure 9 It is a schematic diagram of the air outlet in Embodiment 3 of the present utility model.

[0025] Appendix Figure 10 It is a schematic diagram of the exhaust passage in Embodiment 4 of the present utility model.

[0026] Appendix Figure 11 It is a schematic diagram of the cover plate installation in Embodiment 4 of the present utility model. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] 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 the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0029] 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 indicating 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 the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present application, unless otherwise clearly defined 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.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification 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 specification of this application includes any and all combinations of one or more of the related listed items.

[0032] Embodiment 1

[0033] As shown in the Figure 1 and 2 accompanying drawings, for a circuit breaker exhaust passage structure, after the arc is extinguished by the arc extinguishing grid pieces 2 in the arc extinguishing chamber 1, it is discharged from the exhaust port 401 on the housing 4 through the exhaust passage 3. The exhaust passage 3 is arranged at least on one side surface of the housing 4 corresponding to the arc extinguishing grid pieces 2 in the arc extinguishing chamber 1. In this embodiment, the exhaust passage 3 is arranged on the inner side surfaces of both sides of the housing 4 corresponding to the arc extinguishing grid pieces 2 in the arc extinguishing chamber 1. Exhaust ports 401 are arranged on both sides of the bottom of the housing 4.

[0034] The arc extinguishing chamber 1 and the exhaust passage 3 are separated by an insulating member 5. Air holes 501 are arranged at positions corresponding to the gaps between the adjacent arc extinguishing grid pieces 2 on the insulating member 5. The gas formed by the arc extinguished by the arc extinguishing grid pieces 2 in the arc extinguishing chamber 1 enters the exhaust passage 3 through the air holes 501 from the gaps between the adjacent arc extinguishing grid pieces 2 and is then discharged outside the housing 4.

[0035] In this embodiment, the function of exhausting gas is realized in the inner side surfaces of both sides of the housing 4 and the gaps between the adjacent arc extinguishing grid pieces 2. Without affecting the gas outlet of the arc extinguishing chamber, the space at the bottom end of the housing behind the arc extinguishing grid pieces can be saved to lengthen the grid pieces, further improving the heat capacity of the arc extinguishing grid pieces. At the same time, the arc ions can escape from the side flow channels of the arc extinguishing grid pieces, avoiding arc short - circuit and achieving the effect of pressure maintaining.

[0036] Embodiment 2

[0037] As shown in the Figure 3 and 4 accompanying drawings, in this embodiment, an insulating member 5a is arranged on the plug - in housing 6. The plug - in housing 6 is inserted into the housing 4 from the bottom of the housing 4. An exhaust passage 3a is formed between the plug - in housing 6 and the inner side surface of the housing 4. The gas formed by the arc extinguished by the arc extinguishing grid pieces 2 in the arc extinguishing chamber 1 enters the exhaust passage 3a through the air holes 5a01 on the insulating member 5a from the gaps between the adjacent arc extinguishing grid pieces 2 and is then discharged outside the housing 4. Other structures are the same as those in Embodiment 1.

[0038] Embodiment 3

[0039] As shown in the Figure 5, as shown in FIGS. 6, 7, 8, and 9, in this embodiment, a support member 8 is provided in the housing 4 in the area where the arc extinguishing chamber 1 exhausts. The support member 8 is provided with an inner groove 801 on one side of the arc extinguishing grid 2 in the arc extinguishing chamber 1. The inner groove 801 and the corresponding inner surface of the housing 4 form an exhaust passage three 3c. At the corresponding position of the gap between the bottom of the inner groove 801 and the adjacent arc extinguishing grid 2, a pore three 5a03 is provided. The gas formed by the arc extinguished by the arc extinguishing grid 2 in the arc extinguishing chamber 1 enters the exhaust passage three 3c through the pore three 5a03 on the support member 8 from the gap between the adjacent arc extinguishing grids 1 and then is discharged outside the housing 4. The support member 8 is installed on both sides of the bottom of the arc extinguishing chamber 1. The cooperation between the support member 8 and the housing 4 is fixed by the protrusion 802 on the support member 8 and the concave hole 402 on the housing 4; the support member 8 can not only prevent the arc extinguishing grids from being short-circuited on the premise of ensuring the smooth exhaust of the arc extinguishing chamber, but also cooperate with the housing to play a role in fixing and supporting the arc extinguishing chamber. Other structures are the same as those in Embodiment 1.

[0040] Embodiment 4

[0041] As shown in the attached Figure 10 and 11 figures, in this embodiment, the pore two 5a02 is provided on the side surface of the housing 4,

[0042] the pore two 5a02 corresponds to the gap between the adjacent arc extinguishing grids 2, and a groove 402 is provided on the outer side surface of the housing 4 where the pore two 5a02 is located. A cover plate 7 is installed on the groove 402 to form an exhaust passage two 3b. With this structure, it is possible to avoid the arc short-circuiting of the arc extinguishing grids on the premise of ensuring the smooth discharge of the gas in the arc extinguishing chamber; at the same time, the metal particles generated during the arc ablation enter the exhaust passage through the exhaust holes, avoiding the fusion of the grids caused by the adhesion of the metal particles. Other structures are the same as those in Embodiment 1.

[0043] 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 falling within the scope described in this specification.

[0044] 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 scope of the patent 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 modifications 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. A circuit breaker exhaust passage structure, after the arc is extinguished by the arc extinguishing grid pieces (2) in the arc extinguishing chamber (1), it is discharged from the exhaust port (401) on the housing (4) through the exhaust passage (3), and it is characterized in that: The exhaust passage (3) is arranged at least on one side surface of the housing (4) corresponding to the arc extinguishing grid plates (2) in the arc extinguishing chamber (1). An insulating member (5) is used to separate the arc extinguishing chamber (1) from the exhaust passage (3). Air holes (501) are arranged at positions corresponding to the gaps between the adjacent arc extinguishing grid plates (2) on the insulating member (5). The gas formed by the arc extinguished by the arc extinguishing grid plates (2) in the arc extinguishing chamber (1) enters the exhaust passage (3) through the air holes (501) from the gaps between the adjacent arc extinguishing grid plates (2) and then is discharged outside the housing (4).

2. The exhaust passage structure of a circuit breaker according to claim 1, characterized in that: The exhaust passage (3) is arranged on the inner side surfaces of both sides of the housing (4) corresponding to the arc extinguishing grid plates (2) in the arc extinguishing chamber (1).

3. The exhaust passage structure of a circuit breaker according to claim 1, characterized in that: An insulating member I (5a) is arranged on the plug-in housing (6). The plug-in housing (6) is inserted into the housing (4) from the bottom of the housing (4). An exhaust passage I (3a) is formed between the plug-in housing (6) and the inner side surface of the housing (4). The gas formed by the arc extinguished by the arc extinguishing grid plates (2) in the arc extinguishing chamber (1) enters the exhaust passage I (3a) through the air hole I (5a01) on the insulating member I (5a) from the gaps between the adjacent arc extinguishing grid plates (2) and then is discharged outside the housing (4).

4. The exhaust passage structure of a circuit breaker according to claim 1, characterized in that: An air hole II (5a02) is arranged on the side surface of the housing (4). The air hole II (5a02) corresponds to the gap between the adjacent arc extinguishing grid plates (2). A groove (402) is arranged on the outer side surface of the housing (4) where the air hole II (5a02) is located. A cover plate (7) is installed on the groove (402) to form an exhaust passage II (3b).

5. The exhaust passage structure of a circuit breaker according to claim 1, characterized in that: A support member (8) is arranged in the housing (4) in the area where the arc extinguishing chamber (1) exhausts. An inner groove (801) is arranged on one side of the arc extinguishing grid plates (2) in the arc extinguishing chamber (1) of the support member (8). An exhaust passage III (3c) is formed between the inner groove (801) and the corresponding inner surface of the housing (4). An air hole III (5a03) is arranged at the position corresponding to the gap between the bottom of the inner groove (801) and the adjacent arc extinguishing grid plates (2). The gas formed by the arc extinguished by the arc extinguishing grid plates (2) in the arc extinguishing chamber (1) enters the exhaust passage III (3c) through the air hole III (5a03) on the support member (8) from the gaps between the adjacent arc extinguishing grid plates (2) and then is discharged outside the housing (4).

6. The exhaust passage structure of a circuit breaker according to claim 5, characterized in that: The support member (8) is installed on both sides of the bottom of the arc extinguishing chamber (1).

7. The exhaust passage structure of a circuit breaker according to claim 1, wherein: Exhaust ports (401) are arranged on both sides of the bottom of the housing (4).

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