Arc striking structure of circuit breaker

Abstract

An arc striking structure of a circuit breaker comprises an arc striking structure group, the arc striking structure group comprises an upper magnetic conductive sheet arranged on the back of an arc striking portion of a static contact assembly in a double-breakpoint static contact system, and a front ceramic sheet and a rear ceramic sheet are arranged on the front side and the rear side of the arc striking portion respectively. The outer side of the front ceramic chip and the outer side of the rear ceramic chip are provided with a front magnetic conductive sheet and a rear magnetic conductive sheet respectively, the front ceramic chip, the rear ceramic chip, the arc striking part, the upper magnetic conductive sheet, the front magnetic conductive sheet and the rear magnetic conductive sheet form an arc striking channel, and an arc outlet of the arc striking channel corresponds to an arc inlet of the arc extinguish chamber set. And an arc inlet of the arc striking channel corresponds to a contact part of the double-breakpoint moving contact system and the double-breakpoint static contact system. According to the utility model, the arc generated when the circuit breaker, especially a double-breakpoint circuit breaker is broken, can be rapidly introduced into the arc extinguish chamber, and the breaking capacity of the circuit breaker is improved.

Description

Technical Field

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

[0002] With the development of DC power systems such as photovoltaic, energy storage, rail transit, and data centers, the application of switches in DC systems has become more and more extensive. In the prior art, the circuit breakers originally used for AC systems cannot be used in DC systems, or they can be used in DC systems after being improved. However, the arc generated by the breaking of the moving contact system and the static contact assembly system of the existing circuit breakers used in DC systems, especially the double-breakpoint circuit breakers, cannot be effectively guided into the arc extinguishing chamber, resulting in poor breaking performance of the circuit breakers, especially the double-breakpoint circuit breakers. Utility Model Content

[0003] The purpose of the utility model is to provide an arc-strike structure for a circuit breaker, especially a double-breakpoint circuit breaker, used in a DC power system, in order to address the defect that the arc generated by the disconnection of the moving contact system and the static contact assembly system cannot be effectively guided into the arc extinguishing chamber, resulting in poor breaking performance of the circuit breaker, especially the double-breakpoint circuit breaker, thereby improving the breaking capacity of the circuit breaker.

[0004] Technical Solution

[0005] In order to achieve the above technical objectives, the utility model provides an arc-striking structure of a circuit breaker, which includes an arc-striking structure group, characterized in that: the arc-striking structure group includes an upper magnetic conductive sheet arranged on the back of an arc-striking portion of a static contact assembly in a double-breakpoint static contact system, a front ceramic sheet and a rear ceramic sheet are respectively arranged on the front and rear sides of the arc-striking portion, and a front magnetic conductive sheet and a rear magnetic conductive sheet are respectively installed on the outer sides of the front ceramic sheet and the rear ceramic sheet, the front ceramic sheet, the rear ceramic sheet, the arc-striking portion, the upper magnetic conductive sheet and the front magnetic conductive sheet and the rear magnetic conductive sheet constitute an arc-striking channel, the arc outlet of the arc-striking channel corresponds to the arc inlet of the arc extinguishing chamber group, and the arc inlet of the arc-striking channel corresponds to the contact portion of the double-breakpoint moving contact system and the double-breakpoint static contact system.

[0006] In one embodiment, the static contact assembly includes an arc-striking portion, a tail portion of the arc-striking portion is connected to a static arc-striking plate bent downward, a front portion of the arc-striking portion extends out a contact portion bent upward, and a static silver point is mounted on the contact portion.

[0007] In one embodiment, the static arc-striking plate extends to the top ends of the corresponding arc-extinguishing grids of the left arc-extinguishing chamber and the right arc-extinguishing chamber.

[0008] In one of the embodiments, a moving arc-striking plate is arranged at one side end of the left arc-extinguishing chamber and the right arc-extinguishing chamber corresponding to the left moving contact and the right moving contact respectively.

[0009] In one embodiment, the static arc-striking plate, the arc-striking portion and the contact portion are installed together or in an integrated form.

[0010] In one embodiment, the left arc extinguishing chamber and / or the right arc extinguishing chamber in the arc extinguishing chamber group are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system to independently extinguish the arc generated when the corresponding left moving contact and right moving contact in the double-breakpoint moving contact system are disconnected;

[0011] The arc inlets of the left arc extinguishing chamber and the right arc extinguishing chamber respectively correspond to the arc outlets of the corresponding arc striking channels, and the arc outlets of the left arc extinguishing chamber and the right arc extinguishing chamber correspond to the corresponding exhaust ports on the shell.

[0012] Beneficial Effects

[0013] The utility model provides an arc-striking structure for a circuit breaker, which includes an arc-striking structure group, the arc-striking structure group includes an upper magnetic sheet arranged on the back of the arc-striking part of the static contact assembly in the double-breakpoint static contact system, the front and rear sides of the arc-striking part are respectively provided with a front ceramic sheet and a rear ceramic sheet, the outer sides of the front ceramic sheet and the rear ceramic sheet are respectively provided with a front magnetic sheet and a rear magnetic sheet, the front ceramic sheet, the rear ceramic sheet, the arc-striking part, the upper magnetic sheet, the front magnetic sheet and the rear magnetic sheet constitute an arc-striking channel, the arc outlet of the arc-striking channel corresponds to the arc inlet of the arc-extinguishing chamber group, and the arc inlet of the arc-striking channel corresponds to the contact part of the double-breakpoint moving contact system and the double-breakpoint static contact system. The arc generated when the circuit breaker, especially the double-breakpoint circuit breaker, is disconnected can be quickly introduced into the arc-extinguishing chamber, thereby improving the disconnecting capacity of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Attached Figure 1 It is a schematic diagram of the positional relationship among the double-breakpoint moving contact system, the arc striking structure group and the arc extinguishing chamber group in the embodiment of the utility model.

[0016] Attached Figure 2 The schematic diagram of the decomposition of the arc-starting structure group and the double-breakpoint static contact system in the embodiment of the utility model Figure 1 .

[0017] Attached Figure 3 The schematic diagram of the decomposition of the arc-starting structure group and the double-breakpoint static contact system in the embodiment of the utility model Figure 2 .

[0018] Attached Figure 4 It is a structural schematic diagram of a circuit breaker in an open state in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art 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 related listed items.

[0024] Example

[0025] As attached Figure 1 As shown, an arc striking structure of a circuit breaker includes an arc striking structure group C, as shown in the attached Figure 2 and 3 As shown, the arc-striking structure group c includes an upper magnetic conductive sheet c01, c01' on the back of the arc-striking portion b01a, b01a' of the static contact assembly b01, b01' in the double-breakpoint static contact system b, and the front and rear sides of the arc-striking portion b01a, b01a' are respectively provided with a front ceramic sheet c06, c06' and a rear ceramic sheet c07, c07', and the outer sides of the front ceramic sheet c06, c06' and the rear ceramic sheet c07, c07' are respectively provided with a front magnetic conductive sheet c02, c02' and a rear magnetic conductive sheet c03, c03', and the front ceramic sheet c06, c06', the rear ceramic sheet c07, c07', the arc-striking portion b01a, b01a' a', upper magnetic conductive sheets c01, c01' and front magnetic conductive sheets c02, c02' and rear magnetic conductive sheets c03, c03' constitute arc striking channels c05, c05', the arc outlets of the arc striking channels c05, c05' correspond to the arc entrances of the arc extinguishing chamber group 1, and the arc entrances of the arc striking channels c05, c05' correspond to the contact parts of the double-breakpoint moving contact system a and the double-breakpoint static contact system b. The front magnetic conductive sheets c02, c02' and rear magnetic conductive sheets c03, c03' can further quickly introduce the breaking arc along the arc striking channels c05, c05' into the corresponding left arc extinguishing chamber 101 and right arc extinguishing chamber 102 in the arc extinguishing chamber group 1 under the action of the magnetic field.

[0026] The static contact assembly b01, b01' includes an arc-striking portion b01a, b01a', the tail of the arc-striking portion b01a, b01a' is connected to a static arc-striking plate c04, c04' bent downward, the front of the arc-striking portion b01a, b01a' extends a contact portion b01b, b01b' bent upward, and the contact portion b01b, b01b' is equipped with a static silver point b01c, b01c'. The static arc-striking plate c04, c04', the arc-striking portion b01a, b01a' and the contact portion b01b, b01b' are installed together or in an integrated form. In this embodiment, the static arc-striking plate c04, c04', the arc-striking portion b01a, b01a' and the contact portion b01b, b01b' are in an integrated form. The static arc-striking plates c04, c04' extend to the top of the corresponding arc-extinguishing grids of the left arc-extinguishing chamber 101 and the right arc-extinguishing chamber 102. Figure 4 As shown, moving arc-striking plates c08, c08' are arranged at one side end of the left arc-extinguishing chamber 101 and the right arc-extinguishing chamber 102 corresponding to the left moving contact a2 and the right moving contact a3 respectively.

[0027] In this embodiment, as shown in the attached Figure 1 and 4 As shown, during the rotation of the operating handle 2, the upper connecting rod 3, the tripping buckle 4, and the locking buckle 5 can drive the rotating shaft 6 to rotate, and during the rotation of the rotating shaft 6, the lower connecting rod 7 can drive the double-breakpoint moving contact system a to move up and down, so that the double-breakpoint moving contact system a and the corresponding double-breakpoint static contact system b are in contact and separated to realize the on and off of the circuit breaker. The left arc extinguishing chamber 101 and / or the right arc extinguishing chamber 102 in the arc extinguishing chamber group 1 are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system a to independently extinguish the arc generated when the corresponding left moving contact a2 and right moving contact a3 in the double-breakpoint moving contact system a are disconnected; the arc inlets of the left arc extinguishing chamber 101 and the right arc extinguishing chamber 102 correspond to the arc outlets of the corresponding arc-strike channels c05, c05', respectively, and the arc outlets of the left arc extinguishing chamber 101 and the right arc extinguishing chamber 102 correspond to the corresponding exhaust ports d01, d02 on the housing d.

[0028] The utility model provides an arc striking structure for a circuit breaker, which can quickly introduce the arc generated when the circuit breaker, especially a double-breakpoint circuit breaker, is broken into an arc extinguishing chamber, thereby improving the breaking capacity of the circuit breaker.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0030] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An arc striking structure for a circuit breaker, comprising an arc striking structure group (c), characterized in that: The arc-striking structure group (c) comprises an upper magnetic conductive sheet (c01, c01') arranged at the back of an arc-striking portion (b01a, b01a') of a static contact assembly (b01, b01') in a double-breakpoint static contact system (b), a front ceramic sheet (c06, c06') and a rear ceramic sheet (c07, c07') are respectively arranged at the front and rear sides of the arc-striking portion (b01a, b01a'), a front magnetic conductive sheet (c02, c02') and a rear magnetic conductive sheet (c03, c03') are respectively arranged on the outer sides of the front ceramic sheet (c06, c06') and the rear ceramic sheet (c07, c07'), the front ceramic sheet (c06, c06'), the rear ceramic sheet (c07, c07'), the arc-striking portion (b01a, b01a') and the rear ceramic sheet (c07, c07'). a'), an upper magnetic conductive sheet (c01, c01'), a front magnetic conductive sheet (c02, c02') and a rear magnetic conductive sheet (c03, c03') form an arc striking channel (c05, c05'), an arc outlet of the arc striking channel (c05, c05') corresponds to an arc entrance of the arc extinguishing chamber group (1), and an arc entrance of the arc striking channel (c05, c05') corresponds to a contact position of a double-breakpoint moving contact system (a) and a double-breakpoint static contact system (b).

2. The arc striking structure of a circuit breaker according to claim 1, characterized in that: The static contact assembly (b01, b01') comprises an arc-striking portion (b01a, b01a'), the tail of the arc-striking portion (b01a, b01a') is connected to a static arc-striking plate (c04, c04') bent downward, the front of the arc-striking portion (b01a, b01a') extends a contact portion (b01b, b01b') bent upward, and a static silver point (b01c, b01c') is installed on the contact portion (b01b, b01b').

3. The arc striking structure of a circuit breaker according to claim 2, characterized in that: The static arc-striking plates (c04, c04') extend to the top ends of the corresponding arc-extinguishing grids of the left arc-extinguishing chamber (101) and the right arc-extinguishing chamber (102).

4. The arc striking structure of a circuit breaker according to claim 3, characterized in that: Moving arc-starting plates (c08, c08') are arranged at one side end of the left arc-extinguishing chamber (101) and the right arc-extinguishing chamber (102) corresponding to the left moving contact (a2) and the right moving contact (a3), respectively.

5. The arc striking structure of a circuit breaker according to claim 2, characterized in that: The static arc-striking plate (c04, c04'), the arc-striking part (b01a, b01a') and the contact part (b01b, b01b') are installed together or in an integrated manner.

6. The arc striking structure of a circuit breaker according to claim 1, characterized in that: The left arc extinguishing chamber (101) and / or the right arc extinguishing chamber (102) in the arc extinguishing chamber group (1) are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system (a) to independently extinguish the arc generated when the corresponding left moving contact (a2) and right moving contact (a3) ​​in the double-breakpoint moving contact system (a) are disconnected; The arc inlets of the left arc extinguishing chamber (101) and the right arc extinguishing chamber (102) respectively correspond to the arc outlets of the corresponding arc striking channels (c05, c05'), and the arc outlets of the left arc extinguishing chamber (101) and the right arc extinguishing chamber (102) correspond to the corresponding exhaust ports (d01, d02) on the housing (d).

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