CN111900058A

CN111900058A - Arc extinguish chamber structure of circuit breaker

Info

Publication number: CN111900058A
Application number: CN202010825134.2A
Authority: CN
Inventors: 陈会林; 谢心意; 刘洪武
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2020-11-06
Anticipated expiration: 2040-08-17
Also published as: CN111900058B

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; a second arc-extinguishing grid group consisting of a plurality of transverse arc-extinguishing grid plates which are overlapped at intervals in a longitudinal state, wherein one end of each of the first arc-extinguishing grid group and the second arc-extinguishing grid group is adjacent to each other and mutually formed

Relationships of glyphs, the

The area of the boundary part of the font 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 group and the second arc extinguishing grid group and comprises a first arc striking sheet and a second arc striking sheet which respectively extend towards the direction of the contact mechanism, and the first arc striking sheet and the second arc striking sheet are arranged at intervals. Increasing arc voltage and bodyThe existing circuit breaker has good breaking capacity; 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 invention belongs to the technical field of low-voltage electric appliances, and particularly relates to an arc extinguish chamber structure of a 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 shape of being parallel to each other

Glyphs or inverted "L" glyphs. 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 invention aims to provide an arc extinguishing chamber structure of a circuit breaker, which is beneficial to embodying simple structure, reasonable layout, convenient manufacture and assembly, and is beneficial to lengthening the electric arc generated in the process of opening a moving guide rod at the junction part corresponding to two arc extinguishing grid groups so as to be divided by the arc extinguishing grid pieces, improve the electric arc voltage, and embody good breaking capacity and electric service life performance of the circuit breaker.

The task of the invention is achieved by an arc extinguish chamber structure of a circuit breaker, wherein the circuit breaker comprises 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; a second arc-extinguishing grid group II consisting of a plurality of transverse arc-extinguishing grid plates which are overlapped at intervals in a longitudinal state, and a first arc-extinguishing grid plate groupI is adjacent to one end of the second arc extinguishing grid group II and is formed with each other

Relationships of glyphs, the

The area of the boundary part of the font is formed into an adjacent part, an arc striking device is arranged at a position corresponding to the adjacent part, the arc striking device is used for connecting electric arcs entering the first arc extinguishing grid group I and the second arc extinguishing grid group II, the first arc striking device I and the second arc striking device II extend towards the direction of the contact mechanism respectively, and the first arc striking device I and the second arc striking device II are arranged at intervals.

In a specific embodiment of the invention, the first arc piece i extends in the direction of the contact mechanism and is folded with a first folding plate i in a state of being biased toward the first arc chute group i, the second arc piece ii also extends in the direction of the contact mechanism and is folded with a second folding plate ii in a state of being biased toward the second arc chute group ii, the first folding plate i and the second folding plate ii extend in opposite directions, an arc piece starting opening is formed between the first folding plate i and the second folding plate ii, and an arc piece fracture is formed between a first arc piece end i of the first arc piece i facing one end of the adjacent portion and a second arc piece end ii of the second arc piece ii facing one end of the adjacent portion.

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

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 a further specific embodiment of the present invention, a static contact arc striking plate is disposed between the static contact and one end of the second arc-extinguishing grid group ii extending toward the static contact, the static contact arc striking plate includes a static contact first arc running plate i, a static contact second arc running plate ii, a static contact third arc running plate iii, and a static contact fourth arc running plate iv, the static contact first arc running plate i extends upward from the static contact toward the direction of the moving contact arc striking plate and is connected to the static contact fourth arc running plate iv, the static contact second arc running plate ii is located between one end of the static contact third arc running plate iii and the static contact fourth arc running plate iv, and the other end of the static contact third arc running plate iii extends to one end of the second arc-extinguishing grid group ii extending toward the direction of the static contact in a downward-inclined state.

In a further specific embodiment of the present invention, a minimum distance between the first arc starting plate i and the first arc starting sheet i of the movable contact is a first distance il, a minimum distance between the third arc running plate iii and the second arc starting sheet ii of the stationary contact is a second distance il, and a sum of the first distance il and the second distance il is adapted to an opening distance between the movable contact and the stationary contact when the movable contact is in the open position.

In a more specific embodiment of the present invention, the fixed contact fourth arc running plate iv corresponds to the movable contact second arc striking plate ii, and both of them tend to be parallel, the fixed contact second arc running plate ii corresponds to the second bending plate ii, and a distance between the fixed contact fourth arc running plate iv and the movable contact second arc striking plate ii is adapted to an opening distance between the movable contact and the fixed contact when the movable contact is in the open position.

In a further specific embodiment of the present invention, a first included angle is formed between the first arc striking plate i and the first arc extinguishing grid group i, a second included angle is formed between the second arc striking plate ii and the second arc extinguishing grid group ii, a third included angle is formed between the first arc striking plate i of the movable contact and the first arc extinguishing grid group i, a fourth included angle is formed between the third arc running plate iii of the fixed contact and the second arc extinguishing grid group ii, 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 a still more particular embodiment of the invention, the arc chute has a support and the support is shaped

The plurality of longitudinal arc-extinguishing grid plates which form the first arc-extinguishing grid group I and are arranged at intervals in the transverse state are overlapped at intervals along the length direction of a transverse extension section of the bracket, and the plurality of transverse arc-extinguishing grid plates which form the second arc-extinguishing grid group II and are arranged at intervals in the longitudinal state are overlapped at intervals along the length direction of a longitudinal extension section of the bracket; 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 arc striking plate end portion i and the second arc striking plate end portion ii are disposed at one end of the lateral extension section of the bracket facing the adjacent section in a state of being parallel to the longitudinal arc extinguishing grid plate or at one end of the longitudinal extension section of the bracket facing the adjacent section in a state of being parallel to the lateral arc extinguishing grid plate, 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 invention has the technical effects that: 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 illustrating arrangement of the arc-extinguishing grid pieces in the first arc-extinguishing grid piece group i and the second arc-extinguishing grid piece group ii according to the present invention.

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

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

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.

In the following description, any concept related to the directions or orientations of up, down, left, right, front, and rear is based on the position state of the drawing being described, and thus it should not be construed as a specific limitation to 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 group of arc-extinguishing bars ii 3 is shown, which is also a structural system of the arc-extinguishing chamber, the second group of arc-extinguishing bars ii 3 being formed by a plurality of transverse arc-extinguishing bars stacked at intervals in a longitudinal state, the first group of arc-extinguishing bars i 4 being adjacent to one end of the second group of arc-extinguishing bars ii 3 and forming each other

Relationships of glyphs, the

The region of the boundary portion of the rectangular shape is constituted as an abutting portion 30 (may also be referred to as an "abutting portion", hereinafter the same).

As one of the technical effects of the present invention, an arc striking device 2 is provided at a position corresponding to the abutting portion 30, the arc striking device 2 includes a first arc striking piece i 21 and a second arc striking piece ii 22, the first arc striking piece i 21 extends toward the contact mechanism 5 and is folded by a first folding plate i 211 in a state of being biased toward the first arc chute group i 4, that is, in a state of being biased toward the first arc chute group i 4, and the second arc striking piece ii 22 extends toward the contact mechanism 5 and is folded by a second folding plate ii 221 in a state of being biased toward the second arc chute group ii 3, that is, in a state of being biased toward the second arc chute group ii 3, and the first folding plate i 211 extends toward the first folding plate ii 221, and the first folding plate i 211 and the second folding plate ii are interposed therebetween (a space between the first folding plate 211 and the second folding plate i 221 may be referred to as a space between the first folding plate i 211 and the second folding plate ii) to constitute an arc striking device 2 The start opening 10 is formed as a tab break 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 support 1, and the support 1 is shaped

The plurality of longitudinal arc-extinguishing grid plates which are arranged at intervals in the longitudinal state and form the first arc-extinguishing grid group I4 are overlapped at intervals along the length direction of a transverse extension section 11 of the bracket 1, and the plurality of transverse arc-extinguishing grid plates which are arranged at intervals in the transverse state and form the second arc-extinguishing grid group II 3 are overlapped at intervals along the length direction of a longitudinal extension section 12 of the bracket 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.

Further, the first arc piece end I213 and the second arc piece end II 223 are disposed at the junction of the transverse extension 11 and the longitudinal extension 12 of the bracket 1 in the area of the abutting portion 30, that is, at the junction of the two

At the bending (turning) position of the bracket 1 in the shape of the Chinese character 'ji', a first arc-extinguishing grid group first additional grid piece I42 and a first arc-extinguishing grid group second additional grid piece II 43 are connected into a U-shaped structure, so that the directions of currents flowing on the first arc-extinguishing grid group second additional grid piece II 43 and a first arc-striking piece end part I213 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, and successfully achieves the objective of the invention, thereby truly bringing the technical effects mentioned in the above technical effect column of the applicant into play. All changes, in forms and not material, that are obvious and inherent to the invention disclosure are intended to be within the scope of the invention disclosed herein.

Claims

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, and one end of each of the first arc-extinguishing grid group I (4) and the second arc-extinguishing grid group II (3) is adjacent and mutually forms

Relationships of glyphs, the

The arc striking device (2) is arranged at a position corresponding to the adjacent part (30), the arc striking device (2) is used for connecting an arc entering the first arc-extinguishing grid group I (4) and an arc entering the second arc-extinguishing grid group II (3), the arc striking device comprises a first arc-striking piece I (21) and a second arc-striking piece II (22) which 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 1, 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 arc extinguishing chamber structure of the circuit breaker according to claim 5, characterized in that the minimum distance between the first movable contact arc striking plate I (411) and the first arc striking plate I (21) is formed as a first distance IL (1), the minimum distance between the third fixed contact arc running plate III (5213) and the second arc striking plate II (22) is formed as 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 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. Arc-chute structure for circuit breakers according to claim 2, characterized in that said arc-chute has a support (1) and in that the support (1) is shaped as a frame

The plurality of longitudinal arc-extinguishing grid plates which form the first arc-extinguishing grid group I (4) and are arranged at intervals in the transverse state are overlapped at intervals along the length direction of a transverse extension section (11) of the bracket (1), and the plurality of transverse arc-extinguishing grid plates which form the second arc-extinguishing grid group II (3) and are arranged at intervals in the longitudinal state are overlapped at intervals along the length direction of a longitudinal extension section (12) of the bracket (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 guideThe arc piece end part I (213) and the second arc 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).