CN212461582U - Arc extinguish chamber structure of circuit breaker - Google Patents

Abstract

An arc extinguish chamber structure of a circuit breaker belongs to the technical field of low-voltage electrical appliances. The circuit breaker comprises a contact mechanism; the arc extinguish chamber structure comprises a first arc extinguish grid group which is composed of a plurality of longitudinal arc extinguish grid sheets which are overlapped at intervals in a transverse state; and a second arc-extinguishing grid group consisting of a plurality of transverse arc-extinguishing grid pieces which are overlapped at intervals in a longitudinal state, wherein one ends of the first arc-extinguishing grid piece and one end of the second arc-extinguishing grid piece are adjacent and mutually form a reversed L-shaped relation, the area of the reversed L-shaped junction part is formed into an adjacent part, an arc striking device is arranged at the position corresponding to the adjacent part, the arc striking device is used for connecting electric arcs entering the first arc-extinguishing grid piece group and the second arc-extinguishing grid piece group and comprises a first arc striking piece and a second arc striking piece which respectively extend towards the direction of the contact mechanism, and the first arc striking piece and the second arc striking piece are arranged at intervals. The arc voltage is improved, and the good breaking capacity of the circuit breaker is embodied; the arc extinguishing grid is beneficial to manufacturing and assembling, the ideal reliability of the elongated arc for arc extinguishing grid cutting can be ensured, and the electrical service life performance is improved.

Description

Arc extinguish chamber structure of circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to explosion chamber structure of circuit breaker.

Background

As is known in the art, circuit breakers are typically deployed in power supply and distribution networks and function to limit or break fault currents in the power supply and distribution network. For example, when a large fault current such as that caused by overload or short circuit occurs in the circuit, the metal contacts of the circuit breaker, which are arranged into contact pairs (also called contact pairs), are separated from each other, and an electric arc is generated between the two opposite contact pairs, and the electric arc is cut by arc-extinguishing grids in the structural system of an arc-extinguishing chamber arranged in the circuit breaker, so that the electric arc is quickly or instantly extinguished within a desired time, so as to prevent the electric arc from ablating the surfaces of the contact pairs and generating thermal ionized gas, i.e. high-temperature ionized gas to damage the circuit breaker shell, and prevent the internal pressure of the arc-extinguishing chamber from rising to cause the high-temperature gas to flow out of the circuit breaker shell to generate heat influence on the equipment around the circuit breaker and. In particular, since the arc gas contains metal ions, there is a risk of short-circuiting conductive members or electrical devices around the circuit breaker.

As can be seen from the above description, the arc extinguishing chamber is an important component of the circuit breaker, and the quality of the arc extinguishing capability (kA), which is the extinguishing circuit, directly affects the breaking capability of the circuit breaker on the aforementioned fault circuit, the electrical life of the circuit breaker itself, and the electrical performance characteristics of the circuit breaker. The known arc extinguishing mechanism of the arc extinguishing chamber of the circuit breaker is as follows: the electric arc is driven to enter the arc extinguish chamber by virtue of the magnetic field generated by the conductive loop, and the long electric arc is cut into the multi-section short arcs connected in series by the arc extinguish grid sheet of the arc extinguish chamber, so that the arc extinguish is realized by improving the electric arc voltage.

The research shows that: the larger the number of arc-extinguishing bars cutting a long arc, the higher the arc voltage, the greater the energy to extinguish the arc, which is more beneficial to the electrical life of the circuit breaker. Based on the above factors, in order to effectively improve the arc extinguishing (i.e. arc extinguishing) capability of the arc extinguishing chamber, and particularly effectively improve the capability of extinguishing high-voltage fault current, it is usually necessary to arrange more arc extinguishing grid pieces in the arc extinguishing chamber, but there is a causal relationship between the reasonability of the conductive circuit arranged in the arc extinguishing chamber and whether the arc can be sufficiently cut by the arc extinguishing grid pieces, that is, there is a certain relationship between whether the utilization rate of the arc extinguishing grid pieces can be improved.

In the prior art, arc-extinguishing bars of an arc-extinguishing chamber of a circuit breaker are generally arranged in a manner of being approximately parallel to each other along a moving guide rod, namely the opening direction of a moving contact, and the number of the arc-extinguishing bars arranged in the manner is often limited by the space size of the arc-extinguishing chamber in the height direction, so that a group of arc-extinguishing bars are additionally arranged above an original arc-extinguishing bar group and the moving guide rod in order to increase the number of the arc-extinguishing bars, the arrangement direction of the additionally arranged group of arc-extinguishing bars basically forms a vertical relation with the original arc-extinguishing bar group, and the shape of the whole arc-extinguishing chamber is in a reversed L shape. Although the number of the arc-extinguishing grid pieces is increased, the distance between the boundary parts of the two groups of arc-extinguishing grid pieces and the opening track of the movable guide rod is relatively far, so that the arc generated in the opening process of the movable guide rod is difficult to achieve the purposes that the boundary parts are divided by the arc-extinguishing grid pieces and the arc voltage is improved, and the expected breaking capacity and the electrical service life performance of the circuit breaker are not sufficiently reflected. In view of the foregoing, it is desirable to improve upon the solutions described below.

Disclosure of Invention

The task of the utility model is to provide a help embodying simple structure and rationally distributed and can make things convenient for preparation and assembly, be favorable to making the electric arc that the guide arm opened the in-process production lengthen and can be cut apart by the arc extinguishing bars piece and reach the arc voltage and embody the circuit breaker of good breaking capacity of circuit breaker and electric life performance at the juncture corresponding to two arc extinguishing bars piece groups and arc extinguishing chamber structure.

The utility model discloses a task is accomplished like this, an explosion chamber structure of circuit breaker, the circuit breaker include a contact mechanism; the arc extinguishing chamber structure comprises a first arc extinguishing grid group I, and the first arc extinguishing grid group I is composed of a plurality of longitudinal arc extinguishing grid sheets which are overlapped at intervals in a transverse state; the second arc-extinguishing grid group II is composed of a plurality of transverse arc-extinguishing grid pieces which are overlapped at intervals in a longitudinal state, one end of each of the first arc-extinguishing grid piece group I and one end of each of the second arc-extinguishing grid piece group II are adjacent to each other and form an L-shaped relation, the area of the junction part of the L-shaped shape is formed into a connection part, an arc striking device is arranged at the position corresponding to the connection part and used for connecting electric arcs entering the first arc-extinguishing grid piece group I and entering the second arc-extinguishing grid piece group II, the second arc-extinguishing grid piece group II comprises a first arc striking piece I and a second arc striking piece II which extend towards the direction of the contact mechanism respectively, and the first arc striking piece I and the second arc striking piece II are arranged at intervals.

In a specific embodiment of the present invention, the first arc guiding piece i extends and bends toward the contact mechanism in a state of being biased toward the first arc-extinguishing grid set i, and the second arc guiding piece ii also extends and bends toward the contact mechanism in a state of being biased toward the second arc-extinguishing grid set ii, and the first arc guiding piece i extends toward the second arc-extinguishing grid set ii, and the first arc guiding piece i and the second arc guiding piece ii extend toward each other, and the first arc guiding piece i and the second arc guiding piece ii form an initial opening of the arc guiding piece between the first arc guiding piece i and the second arc guiding piece ii, and the first arc guiding piece i and the second arc guiding piece ii form an arc guiding piece fracture between the second arc guiding piece ii.

In another specific embodiment of the present invention, the first bending plate i is located at the end of the starting opening of the arc striking plate extends to the first end portion i to form a first arc striking plate running plate i, the second bending plate ii is located at the end of the starting opening of the arc striking plate and extends to the second end portion ii to form a second arc striking plate running plate ii, the space between the first arc striking plate running plate i and the second arc striking plate running plate ii is formed as an arc striking plate arc striking channel, and the width of the arc striking plate arc striking channel is gradually enlarged from the starting opening of the arc striking plate.

In another specific embodiment of the present invention, the contact mechanism includes a moving contact and a stationary contact; the movable contact arc striking plate is arranged at one end, corresponding to the opening position of the movable contact, of the first arc extinguishing grid group I, and comprises a movable contact first arc striking plate I, a movable contact second arc striking plate II and a movable contact third arc striking plate III.

In the utility model discloses a still another concrete embodiment the static contact with be provided with a static contact run-on plate between the one end that second arc extinguishing grid piece group II extends to the direction of static contact, this static contact run-on plate includes that the first run-on plate I of static contact, static contact second run-on plate II, static contact third run-on plate III and static contact fourth run-on plate IV, the first run-on plate I of static contact certainly the static contact upwards extends and links up with static contact fourth run-on plate IV towards the direction of moving contact run-on plate, and static contact second runs-on plate II and is located between static contact third run-on plate III's one end and static contact fourth run-on plate IV, and the other end of static contact third run-on plate III extends to with the state of downward sloping second arc extinguishing grid piece group II extends towards the one end of static contact's direction.

In the present invention, in a further specific embodiment, the minimum distance between the first arc striking plate i and the first arc striking plate i of the movable contact is a first distance i, the minimum distance between the third arc running plate iii and the second arc striking plate ii of the fixed contact is a second distance ii, and the sum of the first distance i and the second distance ii is adapted to the distance between the fixed contacts when the movable contact is in the open position.

In the present invention, the moving contact second run arc plate ii is corresponding to the fixed contact fourth run arc plate iv, and both tend to be parallel, the second run arc plate ii is corresponding to the second bend plate ii, and the distance between the fixed contact fourth run arc plate iv and the second bend plate ii is corresponding to the moving contact when the moving contact is in the open position, and the distance between the fixed contact fourth run arc plate iv and the second bend plate ii is corresponding to the open distance between the fixed contacts.

In yet another specific embodiment of the present invention, the first arc striking plate i and the first arc extinguishing grid group i form a first included angle therebetween, the second arc striking plate ii and the second arc extinguishing grid group ii form a second included angle therebetween, the movable contact first arc striking plate i and the first arc extinguishing grid group i form a third included angle therebetween, the fixed contact third arc running plate iii and the second arc extinguishing grid group ii form a fourth included angle therebetween, and the degrees of the first included angle, the second included angle, the third included angle, and the fourth included angle are each 30 to 45 °.

In yet another more specific embodiment of the present invention, the arc extinguishing chamber has a holder, and the holder has a shape of a-l, the first arc-extinguishing grid group i is composed of a plurality of longitudinal arc-extinguishing grid plates disposed at intervals in a transverse state and stacked at intervals in a length direction of a transverse extension of the holder, and the second arc-extinguishing grid group ii is composed of a plurality of transverse arc-extinguishing grid plates disposed at intervals in a longitudinal state and stacked at intervals in a length direction of a longitudinal extension of the holder; the junction area of the transverse extending section and the longitudinal extending section is formed into the abutting part; the first arc ignition piece end portion I and the second arc ignition piece end portion II extend to the support.

In yet another specific embodiment of the present invention, the first tab end portion i and the second tab end portion ii are disposed at one end of the adjacent portion of the bracket facing the lateral extension section in a state parallel to the longitudinal arc chute or at one end of the adjacent portion facing the longitudinal extension section of the bracket in a state parallel to the lateral arc chute, or the first arc striking plate end part I is arranged at one end of the transverse extension section of the bracket facing the adjacent part in a state of being parallel to the longitudinal arc extinguishing grid plate, and the second arc striking plate end part II is arranged at one end of the longitudinal extension section of the bracket facing the adjacent part in a state of being parallel to the transverse arc extinguishing grid plate, or the first arc ignition piece end part I and the second arc ignition piece end part II are arranged at the junction part of the transverse extension section and the longitudinal extension section in the area of the adjacent part.

The technical scheme provided by the utility model the technical effect lie in: because the arc striking device extending towards the direction of the contact mechanism is arranged at the position corresponding to the adjacent part of the first arc-extinguishing grid group I and the second arc-extinguishing grid group II, the arc striking device enables the electric arc generated in the opening process of the moving contact serving as the moving guide rod to be elongated and to be divided by the arc-extinguishing grid pieces, thereby being beneficial to improving the electric arc voltage and embodying the good breaking capacity of the circuit breaker; the additional arc striking device is simple in structure and reasonable in layout, so that the arc striking device is beneficial to manufacturing and assembling, the ideal cutting reliability of the elongated arc for the arc extinguishing grid pieces is guaranteed, and the expected electrical service life performance of the circuit breaker is improved.

Drawings

Fig. 1 is a schematic view of a first embodiment of the present invention.

Fig. 2 is a schematic view of a second embodiment of the present invention.

Fig. 3 is a schematic view of a third embodiment of the present invention.

Fig. 4 is a schematic view of a fourth embodiment of the present invention.

Fig. 5 is a schematic view of a fifth embodiment of the present invention.

Fig. 6 is a schematic diagram of the arrangement of the respective arc-extinguishing grid pieces in the first arc-extinguishing grid piece group i and the second arc-extinguishing grid piece group ii of the present invention.

Fig. 7 is a schematic view of an embodiment 1 of an arc chute of the present invention.

Fig. 8 is a schematic view of an embodiment 2 of an arc chute of the present invention.

Detailed Description

In order to make the technical essence and advantages of the present invention more clear, the applicant below describes in detail the embodiments, but the description of the embodiments is not a limitation of the present invention, and any equivalent changes made according to the inventive concept, which are only formal and not essential, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of the drawing being described, and thus, should not be construed as particularly limiting the technical solution provided by the present invention.

Example 1:

a contact mechanism 5 of the structural architecture of the circuit breaker is shown; a first arc extinguishing grid group I4 of an arc extinguishing chamber structural system is shown, wherein the first arc extinguishing grid group I4 is formed by a plurality of longitudinal arc extinguishing grid plates which are overlapped at intervals in a transverse state; a second switching group ii 3 is also shown, which is also a structural system of the arc extinguishing chamber, the second switching group ii 3 is composed of a plurality of transverse switching bars stacked at intervals in a longitudinal state, the first switching group i 4 and the second switching group ii 3 are adjacent to each other at one end and form an l-shaped relationship with each other, and a region of the l-shaped boundary portion is composed as an abutting portion 30 (also referred to as an "abutting portion", the same applies hereinafter).

As one of the technical effects of the present invention, an arc striking device 2 is disposed at a position corresponding to the adjacent portion 30, the arc striking device 2 includes a first arc striking plate i 21 and a second arc striking plate ii 22, the first arc striking plate i 21 extends and folds in a direction of the contact mechanism 5 in a state of being biased toward the first arc-extinguishing grid group i 4, that is, in a state of being biased toward the first arc-extinguishing grid group i 4, and has a first bending plate i 211, the second arc striking plate ii 22 extends and folds in a direction of the contact mechanism 5 in a state of being biased toward the second arc-extinguishing grid group ii 3, that is, in a state of being biased toward the second arc-extinguishing grid group ii 3, and has a second bending plate ii 221, the first bending plate i 211 extends in a direction of being biased toward the contact mechanism 5, and the second bending plate ii 221 extends, and the first bending plate i 211 and the second bending plate ii are interposed (the space between the first bending plate 211 and the second bending plate ii 221 is also called as a space between the first bending plate ii 221) The tab start opening 10 is formed as a tab cut 9 between a first tab end portion i 213 of the first tab i 21 toward one end of the abutting portion 30 and a second tab end portion ii 223 of the second tab ii 22 toward one end of the abutting portion 30 (also referred to as "space therebetween").

As can be seen from the above description and the schematic illustration of fig. 1, the first and second arc ignition pieces i 21 and ii 22 have the same structure and extend to the same extent in the direction of the contact mechanism 5, and specifically, both the first and second arc ignition pieces i 21 and ii 22 extend in the direction of the contact mechanism 5 in a side-by-side driving state, that is, in the direction away from the abutting portion 30.

With reference to fig. 1, the end of the first bending plate i 211 located at the starting opening 10 of the arc starting sheet extends to the first arc starting sheet end i 213 to form a first arc starting sheet arc running plate i 212, the end of the second bending plate ii 221 located at the starting opening 10 of the arc starting sheet extends to the second arc starting sheet end ii 223 to form a second arc starting sheet arc running plate ii 222, a space between the first arc starting sheet arc running plate i 212 and the second arc starting sheet arc running plate ii 222 forms an arc starting sheet arc running channel 20, and the width of the arc starting sheet arc running channel 20 gradually increases from the starting opening 10 of the arc starting sheet. Moreover, the width of the starting opening 10 of the arc striking piece (i.e. the distance between the two adjacent ends of the first bending plate i 211 and the second bending plate ii 221) is smaller than the distance between the ends of the first arc striking piece i 21 and the second arc striking piece ii 22 facing or approaching the contact mechanism 5.

The contact mechanism 5 comprises a movable contact 51 and a fixed contact 52; a moving contact arc striking plate 41 is arranged at one end of the first arc-extinguishing grid group I4 corresponding to the opening position of the moving contact 51, the moving contact arc striking plate 41 comprises a moving contact first arc striking plate I411, a moving contact second arc striking plate II 412 and a moving contact third arc striking plate III 413, wherein the moving contact first arc striking plate I411 extends from the tail end of a first arc extinguishing grid group I4 to the direction of a first arc striking plate I21 of the arc striking device 2 under the state of being biased to the first arc extinguishing grid group I4, the moving contact second arc striking plate II 412 is formed by folding and expanding from the tail end of the moving contact first arc striking plate I411, namely, one end part far away from the first arc extinguishing grid I4, to the direction of the moving contact 51, and the third arc ignition plate III 413 of the movable contact automatically contacts the tail end of the second arc ignition plate II 412 in an inclined state and is opposite to the position where the movable contact 51 is in an open state.

A fixed contact arc striking plate 521 is disposed between the fixed contact 52 and one end of the second arc extinguishing grid group ii 3 extending in the direction of the fixed contact 52.

Continuing to refer to fig. 1, the fixed contact starting plate 521 includes a fixed contact first starting plate i 5211, a fixed contact second starting plate ii 5212, a fixed contact third starting plate iii 5213 and a fixed contact fourth starting plate iv 5214, the fixed contact first starting plate i 5211 extends upward from the fixed contact 52 in a direction toward the movable contact starting plate 41 and is connected to the fixed contact fourth starting plate iv 5214, the fixed contact second starting plate ii 5212 is located between one end of the fixed contact third starting plate iii 5213 and the fixed contact fourth starting plate iv 5214, and the other end of the fixed contact third starting plate iii 5213 extends to the end of the second arc extinguishing grid group ii 3 extending in a direction toward the fixed contact 52 in a downward tilting state.

As shown in fig. 1, the third stationary contact arc runner plate iii 5213 has a stationary contact arc runner plate extension plate 52131 extending to the bottom of the second arc extinguishing grid group ii 3.

As shown in fig. 1, the minimum distance between the first movable contact first run-out plate i 411 and the first run-out plate i 21 is a first distance il 1, the minimum distance between the third fixed contact run-out plate iii 5213 and the second run-out plate ii 22 is a second distance il 2, and the sum of the first distance il 1 and the second distance il 2 is adapted to the opening distance between the movable contact 51 and the fixed contact 52 when the movable contact 51 is in the open position, and specifically, the sum of the first distance il 1 and the second distance il 2 is close to the opening distance between the movable contact 51 and the fixed contact 52.

The fixed contact fourth arc runner iv 5214 corresponds to the movable contact second arc striking plate ii 412 and is parallel to the movable contact second arc striking plate ii 412, the fixed contact second arc runner ii 5212 corresponds to the second transition folding plate ii 222, and the distance between the fixed contact fourth arc runner iv 5214 and the movable contact second arc striking plate ii 412 is adapted to the distance between the movable contact 51 and the fixed contact 52 when the movable contact 51 is in the open position.

Still referring to fig. 1, a first included angle α is formed between the first arc runner i 21 and the first arc chute group i 4 (a line formed by arranging end portions of the arc chutes facing one end of the contact mechanism 5), a second included angle β is formed between the second arc runner ii 22 and the second arc chute group ii 3, a third included angle θ is formed between the first arc runner i 411 of the movable contact and the first arc chute group i 4, a fourth included angle γ is formed between the third arc runner iii 5213 of the stationary contact and the second arc chute group ii 3, and the degrees of the first included angle α, the second included angle β, the third included angle θ and the fourth included angle γ are preferably 30 to 45 ° and are preferably 30 ° in this embodiment.

As shown in fig. 1, the arc-extinguishing chamber has a frame 1, and the frame 1 is in an l-shape, the first arc-extinguishing grid group i 4 is composed of a plurality of longitudinal arc-extinguishing grid plates which are arranged at intervals in a transverse state and are stacked at intervals along a longitudinal direction of a transverse extension section (11) of the frame 1, and the second arc-extinguishing grid group ii 3 is composed of a plurality of transverse arc-extinguishing grid plates which are arranged at intervals in a longitudinal state and are stacked at intervals along a longitudinal direction of a longitudinal extension section 12 of the frame 1; the boundary area between the laterally extending section 11 and the longitudinally extending section 12 constitutes the abutting part 30; the first tab end portion i 213 and the second tab end portion ii 223 extend to the bracket 1.

As can be seen from the above description and from the schematic illustration of fig. 1, the ends of the first arc ignition piece i 21 and the second arc ignition piece ii 22 far away from the contact mechanism 5, i.e., the first arc ignition piece end portion i 213 of the first arc ignition piece i 21, are both disposed on the bracket 1 as a first fixed end, and the second arc ignition piece end portion ii 223 of the second arc ignition piece ii 22 is disposed on the bracket 1 as a second fixed end.

Fig. 1 also shows a first arc chute group first additional chute plate i 42 and a first arc chute group second additional chute plate ii 43 which are provided at one end of the lateral extension section 11 of the bracket 1 toward the adjacent section 30, i.e., the right end in the position state shown in fig. 1, and the first arc chute group first additional chute plate i 42 and the first arc chute group second additional chute plate ii 43 are connected in a U-shaped structure so as to satisfy the requirement that the directions of currents flowing through the first arc chute group second additional chute plate ii 43 and the first arc ignition plate end portion i 213 are opposite. Fig. 1 further shows a second arc chute group first additional chute plate i 31 and a second arc chute group second additional chute plate ii 32 which are arranged at one end of the longitudinal extension section 12 of the bracket 1 facing the adjacent part 30, i.e. at the upper end of the position state shown in fig. 1, and the second arc chute group first additional chute plate i 31 and the second arc chute group second additional chute plate ii 32 are connected with each other to form a U-shaped structure so as to meet the requirement that the directions of currents flowing through the second arc chute group first additional chute plate i 31 and the second arc chute end part ii 223 are opposite. The run-arc plate extension plate 52131 mentioned above extends to the end of the longitudinally extending section 12 away from the abutment 30, i.e., the lower end in the position shown in fig. 1.

In the present embodiment and as shown in fig. 1, the first tab end portion i 213 and the second tab end portion ii 223 are disposed at the boundary between the laterally extending section 11 and the longitudinally extending section 12 in the area of the abutting portion 30.

The working principle of the present embodiment 1 is described by the applicant in conjunction with fig. 1.

When the movable contact 51 (also called a "movable guide rod") is opened, an electric arc is formed between the movable contact 51 and the fixed contact 52 (also called a "fixed guide rod"), an electric arc root firstly jumps to a third movable contact arc starting plate III 413 closest to the movable contact 51 and a first fixed contact arc starting plate I5211 closest to the fixed contact 52 under the action of magnetic blowing, because a fourth fixed contact arc starting plate IV 5214 corresponds to (also called a "facing") the second movable contact arc starting plate II 412 and because a second fixed contact arc starting plate II 5212 corresponds to (also called a "facing") the first bending plate I211 and the second bending plate II 221, and the distance between the fourth fixed contact arc starting plate IV 5214 and the second movable contact arc starting plate II 412 is close to the opening distance between the movable contacts, the electric arc easily moves in the direction far away from the contact area in an arc channel formed between the fourth fixed contact arc starting plate IV 5214 and the second movable contact arc starting plate II 412, when the electric arc contacts with a first arc striking piece I21 and a second arc striking piece II 22 of a structural system of the arc striking device 2, the electric arc is divided into two sections of electric arcs, one section of the electric arc is formed between a first arc striking plate I411 and the first arc striking piece I21 of the movable contact, the other section of the electric arc is formed between the second arc striking piece II 22 and a third arc running plate III 5213 of the static contact, a first bending plate I211 and a second bending plate II 221 are respectively connected with the two sections of electric arcs, an initial opening 10 of the arc striking piece forms a small short arc, and the short arc enters an arc striking piece arc striking channel 20 under the action of magnetic blowing and is gradually elongated due to the fact that the directions of currents flowing through the first arc striking piece arc running plate I212 and the second arc striking piece arc running plate II 222 are opposite.

The movable contact first arc striking plate I411 and the first arc striking plate I21 form a splayed relation, the second arc striking plate II 22 and the static contact third arc running plate III 5213 form a splayed relation, the minimum distance between the movable contact first arc striking plate I411 and the first arc striking plate I21, namely the sum of the first distance I L1 shown in the figure and the minimum distance between the static contact third arc running plate III 5213 and the second arc striking plate II 22, namely the sum of the second distance II 2 shown in the figure, namely the sum of the first distance I L1 and the second distance II L2 is close to or equivalent to the opening distance between the movable contact 51 and the static contact 52 (the distance between the movable contact 51 and the static contact when the movable contact 51 is positioned at an opening position), one section of the two sections of electric arcs easily enters between the movable contact first arc striking plate I411 and the first arc striking plate I21 and moves into the second arc striking plate group I3 along the movable contact first arc striking plate I411 and the first arc striking plate I21, meanwhile, another section of electric arc easily enters between the second arc striking plate II 22 and the third arc running plate III 5213 of the static contact, and enters the second arc extinguishing grid group II 3 along the second arc striking plate II 22 and the third arc running plate III 5213 of the static contact, and the two sections of electric arc, namely the first section of electric arc and the other section of electric arc, are cut by the arc extinguishing grid plates. Therefore, the respective arc extinguishing grid pieces of the first arc extinguishing grid piece group I4 and the second arc extinguishing grid piece group II 3 can be completely utilized.

Furthermore, the first arc piece end part i 213 and the second arc piece end part ii 223 are arranged at the boundary part of the transverse extension section 11 and the longitudinal extension section 12 of the bracket 1 in the area of the adjacent part 30, namely, at the bending (turning) part of the l-shaped bracket 1, the first arc grid group first additional grid piece i 42 and the first arc grid group second additional grid piece ii 43 are connected into a U-shaped structure, and the directions of the currents flowing on the first arc grid group second additional grid piece ii 43 and the first arc piece end part i 213 are opposite; the first additional grid piece I31 of the second arc-extinguishing grid piece group and the second additional grid piece II 32 of the second arc-extinguishing grid piece group are connected with each other to form a U-shaped structure, the directions of currents flowing on the first additional grid piece I31 of the second arc-extinguishing grid piece group and the end part II 223 of the second arc-extinguishing grid piece group are opposite, so that the electric arc can enter the area of the adjacent part 30 and can be cut by the grid pieces in the area, and the effect of cutting the electric arc by utilizing all longitudinal arc-extinguishing grid pieces of the first arc-extinguishing grid piece group I4 and all transverse arc-extinguishing grid pieces of the second arc-extinguishing grid piece group II 3 is exerted to the utmost extent.

Example 2:

referring to fig. 2, the first tab end portion i 213 may be disposed at one end of the horizontally extending portion 11 facing the adjacent portion 30 in an inclined state forming an angle with the vertical arc-extinguishing grid, or may be disposed at one end of the horizontally extending portion 11 facing the adjacent portion 30 in a state longitudinally parallel to the vertical arc-extinguishing grid, and the second tab end portion ii 223 may be disposed at one end of the vertically extending portion 12 facing the adjacent portion 30 in a state forming an angle with the horizontal arc-extinguishing grid, or may be disposed at one end of the horizontally extending portion 12 facing the adjacent portion 30 in a state transversely parallel to the horizontal arc-extinguishing grid, and in this embodiment, the first arc-extinguishing grid group first additional grid i 42, the first arc-extinguishing grid group second additional grid ii 43, the second arc-extinguishing grid group first additional grid i 31, and the second arc-extinguishing grid group second additional grid ii 32 of embodiment 1 are omitted, and the rest are the same as those described in embodiment 1.

Example 3:

referring to fig. 3, the first tab end portion i 213 and the second tab end portion ii 223 are disposed at one end of the transversely extending section 11 of the bracket 1 facing the adjacent portion 30 in a state of being longitudinally parallel to the longitudinal arc-extinguishing grid, and in this embodiment, the first arc-extinguishing grid group first additional grid piece i 42, the first arc-extinguishing grid group second additional grid piece ii 43, the second arc-extinguishing grid group first additional grid piece i 31 and the second arc-extinguishing grid group second additional grid piece ii 32 of embodiment 1 are omitted, and the rest is the same as the description of embodiment 1.

Example 4:

referring to fig. 4, the first tab end portion i 213 and the second tab end portion ii 223 are disposed at one end of the longitudinally extending section 12 of the bracket 1 facing the abutting portion 30 in a state of being parallel to the lateral arc chute plates, and in this embodiment, the first arc chute group first additional rail plate i 42, the first arc chute group second additional rail plate ii 43, the second arc chute group first additional rail plate i 31, and the second arc chute group second additional rail plate ii 32 of embodiment 1 are omitted, and the rest is the same as the description of embodiment 1.

Example 5:

referring to fig. 5, a first tab end portion i 213 and a second tab end portion ii 223 are disposed at one end of the lateral extension section 11 of the bracket 1 facing the adjacent portion 30 in a state of being longitudinally parallel to the longitudinal arc chute plates, and a V-shaped corner chute 6 is additionally disposed in a region corresponding to the adjacent portion 30, so that the second tab end portion ii 223 is opposite to a current flowing on one side of the V-shaped corner chute 6 adjacent thereto, which is more advantageous for an arc to enter, and in this embodiment, the first arc chute group first additional chute plate i 42, the first arc chute group second additional chute plate ii 43, the second arc chute group first additional chute plate i 31, and the second arc chute group second additional chute plate ii 32 of embodiment 1 are omitted, and the rest are the same as those described in embodiment 1.

To sum up, the first arc striking piece I21 and the second arc striking piece II 22 that the explosion chamber of this application set up on arc striking device 2 have the initial opening 10 of arc striking piece, arc striking piece arc striking passageway 20 and fracture 9 between for first arc striking piece I21 and the interval setting of second arc striking piece II 22, after electric arc was cut apart into two sections electric arcs by arc striking device 2, connect above-mentioned two sections electric arcs by first bending plate I211 and second bending plate II 221, form one section little short arc on the initial opening 10 of arc striking piece, and because first arc striking piece runs on arc plate I212 and second arc striking piece and runs on the electric current opposite direction on arc plate II 222, therefore make this short arc under the effect of magnetic blow-out, get into the arc striking piece arc striking passageway 20 that opens gradually, and be elongated gradually. Simple structure, it is rationally distributed, be favorable to reducing the circuit breaker volume, make full use of all grids of first arc extinguishing grid group I4 and second arc extinguishing grid group II 3 when cutting electric arc, further elongated electric arc, have the high ability of quenching an arc.

Referring to fig. 6 to 8, the upper first and second plates shown in fig. 6 may be disposed in parallel and spaced apart from each other between the arc-extinguishing grids, or the two lowest grids shown in fig. 6 may be disposed at a slight angle with each other. The arc chute may be substantially U-shaped as shown in fig. 7 or substantially rectangular as shown in fig. 8. The arc extinguishing grid pieces are made of metal materials, preferably high-resistance magnetic materials.

The applicant needs to note that the present application is not limited to the above embodiments 1 to 5, and may also be configured that a first included angle α between the first arc striking plate i 21 and the first arc extinguishing grid group i 4 is 45 °, a second included angle β between the second arc striking plate ii 22 and the second arc extinguishing grid group ii 3 is 45 °, the first arc striking plate i 21 and the second arc striking plate ii 22 extend in parallel to each other in the direction of the contact mechanism 5, and the extent of extension of the first arc striking plate i 21 and the second arc striking plate ii 22 in the direction of the contact mechanism 5 should not exceed the connection line of the first arc striking plate i 411 of the movable contact and the third arc running plate iii 5213 of the stationary contact. At this moment, first bending plate I211 may not be arranged on first arc striking piece I21, similarly, second bending plate II 221 may not be arranged on second arc striking piece II 22, electric arcs entering first arc extinguishing grid group I4 and entering second arc extinguishing grid group II 3 are connected to first arc striking piece I21 and second arc striking piece II 22, and current directions on first arc striking piece I21 and second arc striking piece II 22 are opposite, and the purpose that electric arcs are cut by all grid pieces of first arc extinguishing grid group I4 and second arc extinguishing grid group II 3 can be achieved fully.

In summary, the technical solution provided by the present invention overcomes the shortcomings in the prior art, successfully completes the invention task, and truly realizes the technical effects of the applicant in the above technical effect column. All the changes made in the form but not essential based on the disclosure of the present invention shall fall within the technical scope of the present invention.

Claims (10)

1. An arc extinguishing chamber structure of a circuit breaker, the circuit breaker comprises a contact mechanism (5); the arc extinguishing chamber structure comprises a first arc extinguishing grid group I (4), and the first arc extinguishing grid group I (4) is formed by a plurality of longitudinal arc extinguishing grid plates which are overlapped at intervals in a transverse state; a second arc-extinguishing grid group II (3), the second arc-extinguishing grid group II (3) is composed of a plurality of transverse arc-extinguishing grid sheets which are overlapped at intervals in a longitudinal state, the first arc-extinguishing grid group I (4) and one end of the second arc-extinguishing grid group II (3) are adjacent to each other and form an L-shaped relationship, the area of the junction part of the L shape is composed as an adjacent part (30), characterized in that an arc ignition device (2) is arranged at a position corresponding to the abutting part (30), the arc striking device (2) is used for connecting electric arcs entering the first arc-extinguishing grid group I (4) and entering the second arc-extinguishing grid group II (3), and comprises a first arc striking plate I (21) and a second arc striking plate II (22) which respectively extend towards the direction of the contact mechanism (5), and the first arc striking piece I (21) and the second arc striking piece II (22) are arranged at intervals.

2. Arc chute arrangement for a circuit breaker according to claim 1, characterized in that the first tab i (21) extends and folds in the direction of the contact means (5) in a state biased against the first arc chute set i (4) with a first bending plate i (211), and the second tab ii (22) extends and folds in the direction of the contact means (5) in a state biased against the second arc chute set ii (3) with a second bending plate ii (221), the first bending plate i (211) and the second bending plate ii (221) extending towards each other, and between the first bending plate i (211) and the second bending plate ii (221) forming a tab start opening (10), and the first tab end i (213) of the first tab i (21) towards one end of the abutment (30) and the second tab end (223) of the second tab i (22) towards one end of the abutment (30) An arc striking sheet fracture (9) is formed between the two.

3. The arc extinguish chamber structure of the circuit breaker according to claim 2, wherein the first bending plate i (211) is located at the end of the starting opening (10) of the arc striking piece and extends towards the first end i (213) of the arc striking piece to form a first arc striking piece arc running plate i (212), the second bending plate ii (221) is located at the end of the starting opening (10) of the arc striking piece and extends towards the second end ii (223) of the arc striking piece to form a second arc striking piece arc running plate ii (222), the space between the first arc striking piece arc running plate i (212) and the second arc striking piece arc running plate ii (222) is formed as an arc striking piece arc striking channel (20), and the width of the arc striking piece arc striking channel (20) gradually expands from the starting opening (10) of the arc striking piece.

4. Arc chute structure of a circuit breaker according to claim 3, characterized in that said contact means (5) comprise a moving contact (51) and a stationary contact (52); one end of the first arc extinguishing grid group I (4) corresponding to the opening position of the moving contact (51) is provided with a moving contact arc striking plate (41), the moving contact arc striking plate (41) comprises a moving contact first arc striking plate I (411), a moving contact second arc striking plate II (412) and a moving contact third arc striking plate III (413), the moving contact first arc striking plate I (411) extends from the tail end of the first arc extinguishing grid group I (4) to the direction of a first arc striking plate I (21) of the arc striking device (2) in the state of being biased to the first arc extinguishing grid group I (4), the moving contact second arc striking plate II (412) is formed by folding and unfolding the tail end of the moving contact first arc striking plate I (411) towards the direction of the moving contact (51), and the third arc ignition plate III (413) of the moving contact automatically contacts the tail end of the second arc ignition plate II (412) and is folded upwards in an inclined state and is opposite to the position where the moving contact (51) is in an open state.

5. The arc extinguish chamber structure of the circuit breaker according to claim 4, wherein a fixed contact arc striking plate (521) is disposed between the fixed contact (52) and the end of the second arc extinguish grid group II (3) extending towards the direction of the fixed contact (52), the fixed contact arc striking plate (521) comprises a fixed contact first arc running plate I (5211), a fixed contact second arc running plate II (5212), a fixed contact third arc running plate III (5213) and a fixed contact fourth arc running plate IV (5214), the fixed contact first arc running plate I (5211) extends upwards from the fixed contact (52) towards the direction of the movable contact arc striking plate (41) and is connected with the fixed contact fourth arc running plate IV (5214), the fixed contact second arc running plate II (5212) is located between one end of the fixed contact third arc running plate III (5213) and the fixed contact fourth arc running plate III (5214), and the other end of the fixed contact third arc running plate (5213) extends to the second arc extinguish grid group II (3) in the state and faces towards the direction of the second arc extinguish grid group II (3) and is inclined downwards towards the fixed contact (5214) One end extending towards the direction of the fixed contact (52).

6. The arcing chamber structure of a circuit breaker according to claim 5, wherein a minimum distance between the first movable contact arc striking plate I (411) and the first arc striking plate I (21) is a first distance I (L1), a minimum distance between the third fixed contact arc running plate III (5213) and the second arc striking plate II (22) is a second distance II (L2), and a sum of the first distance I (L1) and the second distance II (L2) is adapted to an opening distance between the movable contact (51) and the fixed contact (52) when the movable contact is in the open position.

7. The arc extinguish chamber structure of the circuit breaker according to claim 5, wherein the fixed contact fourth arc runner IV (5214) corresponds to the movable contact second arc striking plate II (412) and is approximately parallel to the movable contact second arc striking plate II, the fixed contact second arc runner II (5212) corresponds to the second bent plate II (221), and the distance between the fixed contact fourth arc runner IV (5214) and the movable contact second arc striking plate II (412) is adapted to the opening distance between the movable contact (51) and the fixed contact (52) when the movable contact is in the open position.

8. The arc extinguish chamber structure of the circuit breaker according to claim 5, wherein a first included angle (α) is formed between the first arc striking plate I (21) and the first arc extinguishing grid group I (4), a second included angle (β) is formed between the second arc striking plate II (22) and the second arc extinguishing grid group II (3), a third included angle (θ) is formed between the first arc striking plate I (411) and the first arc extinguishing grid group I (4), a fourth included angle (γ) is formed between the third arc running plate III (5213) and the second arc extinguishing grid group II (3), and the degrees of the first included angle (α), the second included angle (β), the third included angle (θ) and the fourth included angle (γ) are respectively 30-45 °.

9. The arc-extinguishing chamber structure of the circuit breaker according to claim 2, characterized in that the arc-extinguishing chamber has a frame (1), and the frame (1) is in the shape of the l-shape, the first group of arc-extinguishing grids (4) is composed of a plurality of longitudinal arc-extinguishing grids arranged at intervals in the transverse state and stacked at intervals along the length direction of the transverse extension (11) of the frame (1), and the second group of arc-extinguishing grids (3) is composed of a plurality of transverse arc-extinguishing grids arranged at intervals in the longitudinal state and stacked at intervals along the length direction of the longitudinal extension (12) of the frame (1); the junction area of the transverse extension section (11) and the longitudinal extension section (12) is formed into the abutting part (30); the first arc ignition piece end part I (213) and the second arc ignition piece end part II (223) extend to the support (1).

10. Arc chute arrangement for a circuit breaker according to claim 9, characterized in that said first and second tab end i (213, 223) are arranged at one end of said transversal extension (11) of said support (1) towards said abutment (30) in a state parallel to said longitudinal arc chute or at one end of said longitudinal extension (12) of said support (1) towards said abutment (30) in a state parallel to said transversal arc chute, or that said first tab end i (213) is arranged at one end of said transversal extension (11) of said support (1) towards said abutment (30) in a state parallel to said longitudinal arc chute and that said second tab end ii (223) is arranged at one end of said longitudinal extension (12) of said support (1) towards said abutment (30) in a state parallel to said transversal arc chute, or the first arc ignition piece end part I (213) and the second arc ignition piece end part II (223) are arranged at the junction part of the transverse extension section (11) and the longitudinal extension section (12) in the area of the adjacent part (30).

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