Miniature circuit breaker arc extinguish chamber

Abstract

The utility model discloses a miniature circuit breaker arc extinguish chamber, the miniature circuit breaker arc extinguish chamber comprises a housing, a static contact frame and an arc extinguish chamber, the housing is provided with a pressure release channel, an inlet of the arc extinguish chamber is arranged on the static contact frame, the arc extinguish chamber is provided with a first zero flashover plate and a second zero flashover plate, the first zero flashover plate is provided with a first bending part, and the second zero flashover plate is provided with a second bending part. The first zero flashover plate is provided with a first bending part and is arranged at the outlet of the arc extinguish chamber, the first bending part is provided with an arc-shaped concave part, the concave part is provided with a plurality of pressure relief holes at equal intervals, and the second zero flashover plate is provided with a second bending part and is arranged at the outlet of the pressure relief holes. Residual arcs which are not extinguished in the arc extinguish chamber are blocked and extinguished through the first bending part and the second bending part, the flowing speed of high-pressure gas is reduced through the pressure relief hole, the high-pressure gas can be prevented from carrying flashover to diffuse by reducing the flowing speed of the high-pressure gas, flashover splashing is further avoided, and the service life of the arc extinguish chamber is prolonged. Therefore, the product has the advantages of high-pressure gas guiding and zero flashover.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an arc extinguishing chamber of a miniature circuit breaker. Background Art

[0002] A miniature circuit breaker, also known as a micro circuit breaker, is mainly used in places with alternating current of 50HZ or 60HZ, rated voltage below 400V, and rated working current below 63A. It is used for overloading and short-circuit protection of lighting, power distribution lines and equipment in office buildings, residences and similar buildings, and can also be used for infrequent on-off operation and conversion of circuits. It is mainly used in various places such as industry, commerce, high-rise and civil residences.

[0003] A miniature circuit breaker includes a housing, an operating mechanism, a tripping mechanism, an arc extinguishing chamber, a moving contact, and a static contact. The arc extinguishing chamber is one of the important components installed inside the miniature circuit breaker. Its main function is to make the arc contact with the solid medium, reduce the arc temperature, and thus accelerate the extinction of the arc. The arc extinguishing chamber usually consists of multiple arc extinguishing grid plates and an arc extinguishing frame. In the actual working process of this arc extinguishing mechanism, when the arc is extinguished through the arc extinguishing chamber, the remaining arc will be discharged through the air outlet of the arc extinguishing chamber and then sprayed outside the product, resulting in insufficient arc extinction inside the circuit breaker and there are certain potential safety hazards in use. Therefore, the applicant has made a beneficial design and found a solution to the above problems. The technical solution to be introduced below was generated under this background. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies in the design of the arc extinguishing chamber of the traditional miniature circuit breaker, and provide a product with a guiding effect and zero flashover.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] An arc extinguishing chamber of a miniature circuit breaker includes a housing, a static contact holder, and an arc extinguishing chamber. The housing is provided with a pressure relief channel. The entrance of the arc extinguishing chamber is arranged on the static contact holder. The arc extinguishing chamber is provided with a first zero flashover plate and a second zero flashover plate. The first zero flashover plate is provided with a first bending part and is arranged at the outlet of the arc extinguishing chamber. The first bending part is provided with an arc-shaped recessed part. The recessed part is provided with a plurality of equally spaced pressure relief holes. The second zero flashover plate is provided with a second bending part and is arranged at the outlet of the pressure relief holes. The second bending part is provided with a diversion part and faces the pressure relief channel.

[0007] Preferably, one side of the pressure relief channel is provided with an inclined first guiding part, and the other side of the pressure relief channel is provided with an inclined second guiding part, which together with the first guiding part form a curved channel.

[0008] Preferably, a plurality of through holes are provided at the outlet of the pressure relief channel.

[0009] Preferably, the static contact holder is provided with a bent arc-igniting portion and is arranged at the inlet of the arc extinguishing chamber.

[0010] Preferably, the orientation of the drainage portion is arranged at the inlet of the first guiding portion.

[0011] Advantageous effects:

[0012] Compared with the prior art, the advantageous effects of the present utility model are as follows:

[0013] (1) In the present utility model, the first bending portion and the second bending portion are used to block and extinguish the residual arc that cannot be extinguished by the arc extinguishing chamber, preventing the residual arc from splashing outside or inside the product, thereby overcoming the technical defects proposed in the background art and making the product have the advantage of zero arc flash.

[0014] (2) In the present utility model, the structural strength of the first bending portion is increased through the concave portion, which can withstand the high-pressure gas impact generated instantaneously during arc interruption. The flow rate of the high-pressure gas is reduced through the pressure relief holes. The high-pressure gas is guided to the pressure relief channel through the drainage portion. The path of the high-pressure gas is increased through the first guiding portion and the second guiding portion, further reducing the flow rate of the high-pressure gas. By reducing the flow rate of the high-pressure gas, the diffusion of the high-pressure gas carrying arc flash can be prevented, and further the arc flash splash can be avoided, making the product have the advantage of guiding high-pressure gas. Description of the drawings

[0015] Figure 1 is a schematic internal structure diagram of an arc extinguishing chamber of a miniature circuit breaker of the present utility model;

[0016] Figure 2 is an exploded view of an arc extinguishing chamber of a miniature circuit breaker of the present utility model;

[0017] The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0018] Reference numerals: 1, housing; 2, static contact holder; 3, arc extinguishing chamber; 4, first zero arc flash plate; 5, second zero arc flash plate; 11, pressure relief channel; 12, first guiding portion; 13, second guiding portion; 14, through hole; 21, arc-igniting portion; 41, first bending portion; 42, concave portion; 43, pressure relief hole; 51, second bending portion; 52, drainage portion. Detailed implementation manners

[0019] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0021] In the embodiments of the present utility model, "and / or" only describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0022] Reference example Figure 1 , Figure 2 , a miniature circuit breaker arc extinguishing chamber, comprising a housing 1, a static contact holder 2, and an arc extinguishing chamber 3. The housing 1 is provided with a pressure relief channel 11. The inlet of the arc extinguishing chamber 3 is arranged on the static contact holder 2. The arc extinguishing chamber 3 is provided with a first zero-fly arc plate 4 and a second zero-fly arc plate 5. The first zero-fly arc plate 4 is provided with a first bending portion 41 and is arranged at the outlet of the arc extinguishing chamber 3. The first bending portion 41 is provided with an arc-shaped recess 42. The recess 42 is provided with a plurality of equally spaced pressure relief holes 43. The second zero-fly arc plate 5 is provided with a second bending portion 51 and is arranged at the outlet of the pressure relief holes 43. The second bending portion 51 is provided with a diversion portion 52 and faces the pressure relief channel 11. The first bending portion 41 and the second bending portion 51 are used to block and extinguish the residual arc that cannot be extinguished in the arc extinguishing chamber 3, preventing the residual arc from splashing outside or inside the product. The structure strength of the first bending portion 41 is increased through the recess 42, which can withstand the higher high-pressure gas impact generated during the instantaneous arc interruption, and the flow rate of the high-pressure gas is reduced through the pressure relief holes 43. The high-pressure gas is guided to the pressure relief channel 11 through the diversion portion 52;

[0023] It is worth mentioning that a tilted first guiding portion 12 is provided on one side of the pressure relief channel 11, and a tilted second guiding portion 13 is provided on the other side of the pressure relief channel 11, and together with the first guiding portion 12, they form a curved channel. By forming a curved channel with the first guiding portion 12 and the second guiding portion 13, the travel path of the high-pressure gas is increased, and the flow rate of the high-pressure gas is further reduced. By reducing the flow rate of the high-pressure gas, it is possible to prevent the high-pressure gas from carrying the arcing and spreading, and further avoid the arcing from splashing;

[0024] It is worth mentioning that a number of through holes 14 are provided at the outlet of the pressure relief channel 11, and the high-pressure gas with reduced flow rate is discharged from the housing 1 through the through holes 14;

[0025] It is worth mentioning that the static contact holder 2 is provided with a curved arc guiding portion 21 and is arranged at the entrance of the arc extinguishing chamber 3. When an arc is generated instantaneously when the moving contact holder in the housing 1 is segmented from the static contact holder 2, the arc is guided to the arc extinguishing chamber 3 through the arc guiding portion 21;

[0026] It is worth mentioning that the orientation of the diversion portion 52 is arranged at the entrance of the first guiding portion 12. Since both the diversion portion 52 and the first guiding portion 12 are in an inclined state, therefore, the direction of the high-pressure gas can be guided better.

[0027] Through the above design scheme, the product can achieve the advantages of guiding high-pressure gas and zero arcing.

[0028] The above content further elaborates on the present utility model in combination with specific embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope determined by the claims submitted for the present utility model.

Claims

1. A small circuit breaker arc extinguishing chamber, comprising a housing (1), a stationary contact frame (2), and an arc extinguishing chamber (3), characterized in that: The housing (1) is provided with a pressure relief passage (11); the entrance of the arc extinguishing chamber (3) is arranged on the static contact frame (2); the arc extinguishing chamber (3) is provided with a first zero arcing plate (4) and a second zero arcing plate (5); the first zero arcing plate (4) is provided with a first bending portion (41) and is arranged at the outlet of the arc extinguishing chamber (3); the first bending portion (41) is provided with a recessed portion (42); the recessed portion (42) is provided with a plurality of equally spaced pressure relief holes (43); the second zero arcing plate (5) is provided with a second bending portion (51) and is arranged at the outlet of the pressure relief hole (43); the second bending portion (51) is provided with a drainage portion (52) and faces the pressure relief passage (11).

2. The arc extinguishing chamber of a miniature circuit breaker according to claim 1, characterized in that: An inclined first guide portion (12) is provided on one side of the pressure relief channel (11), and an inclined second guide portion (13) is provided on the other side of the pressure relief channel (11), forming a curved channel with the first guide portion (12).

3. The arc extinguishing chamber of the miniature circuit breaker according to claim 2, characterized in that: A plurality of through holes (14) are provided at the outlet of the pressure relief channel (11).

4. The arc extinguishing chamber of a miniature circuit breaker according to claim 3, characterized in that: The stationary contact frame (2) is provided with a curved arc striking portion (21) and is arranged at the entrance of the arc extinguishing chamber (3).

5. The arc extinguishing chamber of the miniature circuit breaker according to claim 4, characterized in that: The drainage portion (52) is oriented and arranged at the entrance of the first guide portion (12).

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