Arc extinguishing device of switch unit and circuit breaker

Abstract

The utility model belongs to the technical field of switches, and particularly relates to an arc extinguishing device of a switch unit and a circuit breaker, comprising a plurality of first arc extinguishing grid sheets and a plurality of second arc extinguishing grid sheets, the plurality of first arc extinguishing grid sheets are arranged below a first insulating member and are vertically or relatively vertically inclined, and the plurality of second arc extinguishing grid sheets are arranged below a second insulating member. The plurality of first arc extinguishing grid plates are sequentially distributed in the direction from the arc inlet side to the arc outlet side to form a first arc extinguishing grid plate group; and the plurality of second arc extinguishing grid sheets are positioned above the first insulating part, are transversely or obliquely arranged and are sequentially distributed along the longitudinal direction to form a second arc extinguishing grid sheet group. According to the utility model, by optimizing the layout of the arc-extinguishing grid sheets, the original arc-extinguishing grid sheets which are arranged transversely or approximately transversely and are close to the static contact side are changed into a plurality of first arc-extinguishing grid sheets which are arranged vertically or approximately vertically, so that the layout of more arc-extinguishing grid sheets is realized; the arc in the first arc extinguishing space is prevented from moving to the second arc extinguishing space from the arc inlet side, so that more first arc extinguishing grid plates effectively participate in arc extinguishing.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, and in particular relates to an arc extinguishing device of a switch unit and a circuit breaker. Background Art

[0002] The arc extinguishing chamber in a circuit breaker extinguishes the arc generated when the contacts open due to a short circuit. The greater the number of grids, while ensuring a certain gap between the grids, the easier it is to raise the arc voltage and extinguish the arc. To achieve high breaking capacity in high-voltage circuit breakers, methods such as enlarging the arc extinguishing chamber, lengthening the contacts to increase the contact spacing, and connecting multiple breakpoints in series are commonly used. While these methods can improve the breaking capacity of the circuit breaker, they significantly increase the size of the circuit breaker. This technical approach of increasing breaking capacity by sacrificing the size of the circuit breaker clearly does not meet market demand.

[0003] Chinese patent CN202021662450.4 discloses a contact arc extinguishing device for a circuit breaker, including an arc extinguishing chamber and a contact system. The contact system includes a moving contact and a static contact, and the moving contact and the static contact control the on and off of the circuit breaker circuit by contact or separation; the arc extinguishing chamber includes a group of arc extinguishing grids arranged in an L shape, and the arc extinguishing grids in the arc extinguishing grid group are arranged radially.

[0004] Patent CN202021271193.1 discloses a contact arc extinguishing system for a circuit breaker, including an arc extinguishing chamber and a contact system, wherein the contact system includes a moving contact and a static contact, and the moving contact and the static contact control the on and off of the circuit breaker circuit by contact or separation; the arc extinguishing chamber includes a group of arc extinguishing grids composed of a plurality of arc extinguishing grids, and the arc extinguishing grid group is provided with an upper arc extinguishing grid group in which arc extinguishing grids are arranged in parallel in a horizontal direction and a lower arc extinguishing grid group in which arc extinguishing grids are arranged in parallel in a vertical direction and an intermediate arc extinguishing grid group arranged in a fan shape between the upper arc extinguishing grid group and the lower arc extinguishing grid group.

[0005] Both of the aforementioned patents address the problem of increasing the number of arc-extinguishing grids within the arc-extinguishing chamber by changing the layout of the grids within the limited space. This allows the circuit breaker to further effectively lengthen and extinguish the arc generated when the contacts are disconnected in high-voltage environments, thereby improving the circuit breaker's breaking performance. There are also some multi-layer arc-extinguishing chambers (patent CN202220666149.3). These structures still cannot meet the growing demand, either due to excessive size, insufficient number of grids, complex and costly structures, or poor arc-strike performance. In short, a new structure is urgently needed to address the high-voltage breaking problem of new high-voltage circuit breakers. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an arc extinguishing device and a circuit breaker for a switch unit.

[0007] The technical solution adopted by the present invention is as follows: an arc extinguishing device for a switch unit, comprising:

[0008] The arc extinguishing mechanism has a lower end corresponding to the position of the static contact and an upper end corresponding to the opening position of the moving contact, and the two sides are respectively an arc inlet side and an arc outlet side, and includes a plurality of arc extinguishing grids and a first insulating member;

[0009] The plurality of arc-extinguishing grids include a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids;

[0010] A plurality of first arc-extinguishing grids are located in a first arc-extinguishing space below the first insulating member, wherein the first arc-extinguishing grids are arranged vertically or inclined relative to the vertical direction, and the plurality of first arc-extinguishing grids are sequentially distributed from the arc-entry side to the arc-exit side to form a first arc-extinguishing grid group;

[0011] The plurality of second arc-extinguishing grids are located in the second arc-extinguishing space above the first insulating member. The second arc-extinguishing grids are arranged in a transverse or oblique direction and are sequentially distributed along the longitudinal direction to form a second arc-extinguishing grid group.

[0012] The first arc-extinguishing grid in the first arc-extinguishing space is arranged vertically or obliquely at an angle α relative to the vertical, where α is ≤ 30°.

[0013] The first insulating member is a first insulating partition arranged in a transverse or oblique direction, and a first notch for guiding the arc to enter is provided on a side facing the moving contact.

[0014] The first insulating member is obliquely arranged with the side close to the arc-exiting side higher than the side close to the arc-entering side. The first arc-extinguishing grids of the first arc-extinguishing grid group are obliquely distributed with the side close to the arc-exiting side higher than the side close to the arc-entering side.

[0015] The second arc-extinguishing grid group has an L-shaped layout, including a third arc-extinguishing grid group longitudinally distributed above the first insulating member and a fourth arc-extinguishing grid group transversely distributed from the upper end of the third arc-extinguishing grid group toward the moving contact in the open position; the second arc-extinguishing grids constituting the third arc-extinguishing grid group are arranged in parallel, and the second arc-extinguishing grids constituting the fourth arc-extinguishing grid group are arranged in parallel, and a certain angle is formed between the two groups. The two groups are transitionally connected by a fifth arc-extinguishing grid group that is locally distributed in a fan shape.

[0016] The arc extinguishing mechanism includes an arc striking assembly, which includes a static arc striking plate, an intermediate arc striking plate, and a dynamic arc striking plate. The static arc striking plate is arranged near the arc entering side of the lower end of the arc extinguishing mechanism, the intermediate arc striking plate includes a first plate and a second plate, and the dynamic arc striking plate is arranged near the arc entering side of the upper end of the arc extinguishing mechanism. The first plate is arranged vertically or obliquely, and the second plate is arranged horizontally or obliquely. The upper end of the first plate is bent and connected to the end of the second plate away from the arc entering side. The first arc extinguishing grid is distributed between the static arc striking plate and the first plate, the second plate is located above the first insulating member, and the second arc extinguishing grid is distributed between the second plate and the dynamic arc striking plate.

[0017] The arc extinguishing mechanism includes a narrow gap component, which is composed of two gas-producing plates. The two gas-producing plates are arranged at a certain distance apart to form a narrow gap space. The static contact is fixed in the narrow gap space, and the moving contact operates in the narrow gap space. A magnetizing plate is provided on the back of the gas-producing plate compared to the narrow gap space, and the magnetizing plate is provided on the side of the gas-producing plate close to the moving contact located in the opening position.

[0018] A circuit breaker, comprising:

[0019] case;

[0020] The static contact comprises a conductive plate on which a static contact point is provided;

[0021] The moving contact has a moving contact point, which can rotate around the pivot relative to the housing and has a closed position and an open position, and the static contact point is located on one side of the moving track of the moving contact rotating around the pivot axis;

[0022] And, the arc extinguishing device of the switch unit as described above is arranged in the shell, the first insulating member is arranged higher than the conductive plate, and several first arc extinguishing grids are located in the first arc extinguishing space formed below the first insulating member and the side of the first insulating member.

[0023] The static contact includes a connecting plate and a terminal plate. The conductive plate, the connecting plate and the terminal plate are connected in sequence. The conductive plate and the connecting plate are bent and connected to form a height difference between the two. A second insulating member is provided. The second insulating member is located between the connecting plate and the first insulating member and is separated from the first insulating member by a certain distance. The first insulating member, the side surface of the conductive plate and the second insulating member form a first arc extinguishing space for accommodating the first arc extinguishing grid group.

[0024] The second insulating member includes a second insulating plate. The second insulating plate is provided with a through hole for the conductive plate to pass through. The connecting plate is fixed on the lower surface of the second insulating plate. The conductive plate is located above the second insulating plate.

[0025] A first protrusion and a second protrusion are respectively provided at both ends of the second insulating plate. The first protrusion is wrapped around the part where the conductive plate and the connecting plate are bent and connected, and the edge of the first protrusion is close to the static contact. The second protrusion is located on the side of the first plate away from the first arc-extinguishing grid group, and the upper end of the second protrusion extends to the height position of the second arc-extinguishing grid group.

[0026] The beneficial effects of the present invention are as follows: the present invention optimizes the layout of the arc extinguishing grids, changes the original arc extinguishing grids arranged horizontally or nearly horizontally close to the static contact side into several first arc extinguishing grids arranged vertically or nearly vertically, thereby realizing the layout of a larger number of arc extinguishing grids, and arranging a first insulating member on the top to prevent the arc in the first arc extinguishing space from running to the second arc extinguishing space on the arc entry side, so that more first arc extinguishing grids can effectively participate in arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0028] Figure 1 This is a three-dimensional view of an embodiment of the utility model;

[0029] Figure 2 This is an exploded view of an embodiment of the present invention;

[0030] Figure 3 This is a structural diagram of a static contact in one embodiment of the utility model;

[0031] Figure 4 This is a cross-sectional view of an embodiment of the present utility model;

[0032] Figure 5 This is a cross-sectional view of the coordinated structure of the arc-extinguishing grid, the first insulating member and the arc-striking assembly in one embodiment of the present invention;

[0033] Figure 6 for Figure 4 A magnified schematic diagram of part A;

[0034] Figure 7 This is an exploded view of the cooperation structure between the static contact and the second insulating member in one embodiment of the present utility model;

[0035] Figure 8 This is a structural diagram of the first insulating member in one embodiment of the present utility model;

[0036] Figure 9 This is a schematic structural diagram of the middle arc-starting piece in one embodiment of the present utility model;

[0037] Figure 10 This is a schematic diagram of the location of the magnetizing plate in one embodiment of the present utility model;

[0038] Figure 11 This is a schematic diagram of the arc extinguishing trend during the opening process of an embodiment of the utility model;

[0039] In the figure,

[0040] Static contact-100, static contact point-110, conductive plate-120, connecting plate-130, terminal block-140,

[0041] Moving contact-200, moving contact-210,

[0042] Side panels - 300,

[0043] The first arc quenching grid group 410, the second arc quenching grid group 420, the third arc quenching grid group 421, the fourth arc quenching grid group 422, the fifth arc quenching grid group 423,

[0044] Static arc-striking piece-510, third plate-511, fourth plate-512, middle arc-striking piece-520, first plate-521, second plate-522, dynamic arc-striking piece-530, fifth plate-531, sixth plate-532,

[0045] First insulating member-600, first notch-610,

[0046] Second insulating member 700, second insulating plate 710, through-hole 711, first protrusion 720, second protrusion 730, third insulating plate 740;

[0047] Gas production plate-800, magnetization plate-810. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0049] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0050] The terms "up," "down," "front," "back," "left," "right," "inside," "outside," "top," "bottom," and "side" used in this invention are intended solely to refer to the directions or positions in the accompanying drawings. Therefore, the terms "up," "down," "front," "back," "left," and "side" are intended to illustrate and facilitate understanding of this invention and are not intended to limit its scope. The "up" and "down" direction is considered vertical. The direction perpendicular to the vertical on paper, or the "left" and "right," is considered horizontal. Directions between the horizontal and vertical directions are considered oblique.

[0051] A switching unit, such as Figure 1 、 Figure 2 As shown, it includes a conducting mechanism and an arc extinguishing mechanism.

[0052] The conductive mechanism includes a static contact 100 and a movable contact 200 that cooperate with each other. The static contact 100 has a static contact point 110, and the movable contact 200 has a movable contact point 210. The movable contact 200 is movable relative to the static contact 100 and has a closing position and an opening position. When the movable contact 200 moves from the closing position to the opening position, an arc is generated between the static contact point 110 and the movable contact 210. Figure 3 As shown, the static contact 100 of the present application includes a conductive plate 120, a connecting plate 130, and a terminal block 140 connected in sequence. The static contact 110 is disposed on the conductive plate 120. The arc extinguishing mechanism includes two opposing side plates 300 and a plurality of arc extinguishing grids fixed between the side plates 300, which are used to cut the arc generated between the static contact 100 and the moving contact 200 when they are disconnected. The static contact 110 and the moving contact 210 are made of a welding-resistant electrical contact material, such as silver.

[0053] In some embodiments of the present invention, the movable contact 200 is rotatable about a pivot, and the stationary contact 110 is located on one side of a trajectory of the movable contact 210 rotating about the pivot. Rotating the movable contact 210 about the pivot can move the movable contact 210 closer to the stationary contact 110 to engage with the stationary contact 110 or further away from the stationary contact 110. Specifically, the switch unit is a circuit breaker or an isolating switch.

[0054] Specifically, such as Figure 4As shown, the plurality of arc-extinguishing grids include a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids, and a first insulating member 600 is provided. The first insulating member 600 is arranged higher than the conductive plate 120. The plurality of first arc-extinguishing grids are located in a first arc-extinguishing space formed below the first insulating member 600 and the side of the conductive plate 120. The first arc-extinguishing grids are arranged vertically or obliquely at an angle α relative to the vertical and are sequentially distributed in the horizontal direction to form a first arc-extinguishing grid group 410, where α is ≤ 30°. The openings of the first arc-extinguishing grids face the first insulating member 600. The plurality of second arc-extinguishing grids are located in a second arc-extinguishing space formed above the first insulating member 600. The second arc-extinguishing grids are arranged horizontally or obliquely and are sequentially distributed in the longitudinal direction to form a second arc-extinguishing grid group 420. The openings of the second arc-extinguishing grids face the moving path of the moving contact 200. The arc-extinguishing grids arranged horizontally or nearly horizontally in the side space of the static contact in the existing conventional layout are changed to a plurality of first arc-extinguishing grids arranged vertically or nearly vertically, so as to realize the layout of a larger number of arc-extinguishing grids, and a first insulating member is arranged on the top to prevent the arc in the first arc-extinguishing space from running to the second arc-extinguishing space on the arc-entry side, so that more first arc-extinguishing grids can effectively participate in arc extinguishing.

[0055] Here, "being arranged obliquely at an angle α relative to the vertical" means that the first arc-extinguishing grid is inclined α to the left or α to the right relative to the vertical direction. For the same space, if α is set too large, the number of grids will be less, so α is set to ≤ 30°.

[0056] like Figure 8 As shown, the first insulating member 600 is a first insulating partition arranged horizontally or obliquely. A first notch 610 is provided on the side facing the movable contact 200 to guide the arc. This stretches the arc between the static contact 110 and the first insulating member 600, allowing all first arc-quenching grids in the first arc-quenching space to effectively participate in arc extinguishing. The arc between the first insulating member 600 and the movable contact 210 stretches as the movable contact 210 opens, and is effectively extinguished by the second arc-quenching grid group 420. This provides more space for installing a larger number of second arc-quenching grids.

[0057] In some embodiments of the present application, the conductive plate 120 and the connecting plate 130 are bent and connected to form a height difference therebetween. A second insulating member 700 is provided. The second insulating member 700 is located between the connecting plate 130 and the first insulating member 600 and is spaced a certain distance from the first insulating member 600. The first insulating member 600, the side surface of the conductive plate 120, and the second insulating member 700 form a first arc-extinguishing space for accommodating the first arc-extinguishing grid assembly 410. Preferably, the second insulating member 700 is in contact with the connecting plate 130.

[0058] In some embodiments of the present application, the arc extinguishing mechanism includes an arc striking assembly, Figure 4-Figure 6As shown, the arc-striking assembly includes a static arc-striking piece 510, an intermediate arc-striking piece 520, and a dynamic arc-striking piece 530. The static arc-striking piece 510 is arranged close to the static contact 100, the intermediate arc-striking piece 520 includes a first plate 521 and a second plate 522, and the dynamic arc-striking piece 530 is arranged close to the dynamic contact 200 located in the opening position. The first plate 521 is arranged vertically or obliquely, and the second plate 522 is arranged horizontally or obliquely. The upper end of the first plate 521 is bent and connected to the end of the second plate 522 away from the dynamic contact 200. The first arc-extinguishing grid is distributed between the static arc-striking piece 510 and the first plate 521, the second plate 522 is located above the first insulating member 600, and the second arc-extinguishing grid is distributed between the second plate 522 and the dynamic arc-striking piece 530. The static arc-striking piece 510 serves to guide the arc on the static contact 100 to the first arc-extinguishing grid group 410, and the moving arc-striking piece 530 serves to guide the arc on the moving contact 200 located in the open position to the second arc-extinguishing grid group 420. The intermediate arc-striking piece 520 serves to guide the first arc-extinguishing grid group 410 upward from the side of the first insulating member 600 away from the static contact 100, so as to prevent the arc from remaining in the arc-extinguishing chamber between the first insulating member 600 and the connecting plate 130.

[0059] In some embodiments of the present application, the end of the conductive plate 120 away from the first arc-quenching grid group 410 is bent and connected to the connecting plate 130. The static arc-starting plate 510 includes a third plate 511 and a fourth plate 512 that are bent and connected. The third plate 511 is fixedly connected to the lower surface of the conductive plate 120, and the fourth plate 512 is located on the side of the conductive plate 120 close to the first arc-quenching grid group 410. The fourth plate 512 is separated from the static contact 110 by a certain distance d. Furthermore, the fourth plate 512 is in contact with the side of the conductive plate 120 close to the first arc-quenching grid group 410, and its upper end is raised compared to the upper surface of the conductive plate 120, used for arc starting.

[0060] In some embodiments of the present application, the distance d between the fourth plate 512 and the static contact 110 is ≥ 3 mm.

[0061] In some embodiments of the present application, the third plate 511 and the conductive plate 120 are fastened with bolts to facilitate the fixation of the static arc-striking piece 510. The structure is simple and the problem of failure caused by the static arc-striking piece falling off during disconnection or life tests is solved.

[0062] In some embodiments of the present application, the static contact 100 is fixed on the second insulating member 700, such as Figure 7As shown, the second insulating member 700 includes a second insulating plate 710, the connecting plate 130 is fixed on the lower surface of the second insulating plate 710, and the second insulating plate 710 is provided with a through opening 711 for the conductive plate 120 to pass through, so that the conductive plate 120 is located above the second insulating plate 710 and the connecting plate 130 is located below the second insulating plate 710.

[0063] A first protrusion 720 and a second protrusion 730 are respectively provided at both ends of the second insulating plate 710. The first protrusion 720 is wrapped around the bent connection portion of the conductive plate 120 and the connecting plate 130, and the edge of the first protrusion 720 is close to the static contact 110. The second protrusion 730 is located on the side of the first plate body 521 away from the first arc-extinguishing grid group 410, and the upper end of the second protrusion 730 extends to the height position of the second arc-extinguishing grid group 420.

[0064] In some embodiments of the present application, the edge of the opening 711 is located below the first arc-quenching grid assembly 410, facilitating the installation of the static contact 100 and the static arc-striking plate 510. The second insulating member 700 also includes a third insulating plate 740, which is fixed to the opening 711 to insulate and separate the first arc-quenching grid assembly 410 from the connecting plate 130. Furthermore, the area where the third insulating plate 740 is located covers the area where the third plate 511 is located, i.e., the left edge of the third insulating plate 740 is located to the left of the left edge of the third plate 511. Specifically, the third insulating plate 740 is sandwiched and fixed between the second insulating plate 710 and the connecting plate 130.

[0065] In some embodiments of the present application, the thickness of the first arc-extinguishing grid is greater than the thickness of the second arc-extinguishing grid, and the second arc-extinguishing grid is the thickness of a conventional arc-extinguishing grid. In order to arrange a larger number of arc-extinguishing grids, the first insulating member 600 is close to the conductive plate 120. In this way, the length of the first arc-extinguishing grid along the height direction is smaller. In order to ensure the burning resistance, the first arc-extinguishing grid is thickened. Therefore, the first arc-extinguishing grid is a special arc-extinguishing grid that is shorter and thicker than the conventional arc-extinguishing grid.

[0066] Preferably, the first insulating member 600 is arranged obliquely with the arc-out side facing upward, and the first arc-extinguishing grids of the first arc-extinguishing grid group 410 are distributed in an oblique line shape with the side away from the conductive plate 120 higher than the side close to the conductive plate 120, that is, of two adjacent first arc-extinguishing grids, the first arc-extinguishing grid away from the conductive plate 120 is higher than the first arc-extinguishing grid close to the conductive plate 120, so that a channel is formed between the first arc-extinguishing grid group 410 and the first insulating member 600, which is arranged obliquely with the arc-out side facing upward.

[0067] In some embodiments of the present application, the second arc-quenching grids are arranged obliquely, and the inclination of one or more second arc-quenching grids close to the first insulating member 600 is consistent with the inclination of the first insulating member 600, so as to arrange more second arc-quenching grids.

[0068] In some embodiments of the present application, the second arc-quenching grid group 420 has an L-shaped layout, comprising a third arc-quenching grid group 421 longitudinally arranged above the first insulating member 600, and a fourth arc-quenching grid group 422 transversely arranged from the upper end of the third arc-quenching grid group 421 toward the moving contact 200 in the open position. Specifically, the second arc-quenching grids constituting the third arc-quenching grid group 421 are arranged in parallel, and the second arc-quenching grids constituting the fourth arc-quenching grid group 422 are arranged in parallel, and the inclination of the fourth arc-quenching grid group 422 is greater than the inclination of the third arc-quenching grid group 421. The two groups are transitionally connected by a fifth arc-quenching grid group 423 arranged in a fan-shaped manner, that is, a certain angle is formed between adjacent arc-quenching grids in the fifth arc-quenching grid group 423.

[0069] In some embodiments of the present application, the moving arc-striking plate 530 includes a fifth plate 531 and a sixth plate 532, the fifth plate 531 is arranged obliquely and is adjacent to the fourth arc-extinguishing grid group 422, and the sixth plate 532 is connected to the lower end of the fifth plate 531 and extends longitudinally to a height corresponding to the moving contact 200 in the opening position.

[0070] In some embodiments of the present application, a narrow gap assembly is fixed between two oppositely arranged side plates 300, and the narrow gap assembly is composed of two gas-producing plates 800. The two gas-producing plates 800 are arranged at a certain interval to form a narrow gap space. The static contact 110 is fixed in the narrow gap space, and the moving contact 210 operates in the narrow gap space, so that the arc generated by the disconnection is generated in the narrow gap space between the two gas-producing plates 800, which is convenient for gas production and arc blowing.

[0071] In some embodiments of the present application, a magnetizing plate 810 is provided on the back side of the gas production plate 800, relative to the narrow gap, to help improve breaking capacity and electrical life performance. Specifically, a groove is provided on the back side of the gas production plate 800, relative to the narrow gap, that matches the shape of the magnetizing plate 810. The magnetizing plate 810 is embedded in the groove and retained in place by the side plate 300. Specifically, the gas production plate 800 and the side plate 300 are fastened with bolts, with the magnetizing plate 810 located between the gas production plate 800 and the side plate 300.

[0072] In some embodiments of the present application, Figure 10 As shown, the magnetizing plate 810 is arranged on one side of the gas producing plate 800 close to the moving contact 200 located at the opening position, so as to facilitate magnetization and guide the arc to move upward.

[0073] The arc extinguishing process of some embodiments of the present application is as follows: Figure 11 As shown, at the moment when the moving contact 200 and the static contact 100 are disconnected, the gap between the contacts is extremely small, the electric field strength instantly exceeds the breakdown threshold, the arc suddenly breaks out, the current quickly transfers from the contacts to the arc channel, quickly rises to the breakdown voltage, and quickly forms arc ①. As the moving contact 200 moves, the arc ① is elongated. Under the action of various iron parts and the electromagnetic field such as the narrow gap component and the static arc-starting piece on the right side of the static contact, the arc quickly moves to the arc extinguishing grid area, and enters the first arc extinguishing space below the first insulating member 600 and the second arc extinguishing space above the first insulating member 600, respectively. Figure 11 The direction of the arc ② is shown in the figure. As the moving contact 200 moves to the open position, more second arc extinguishing grids are introduced to participate in the arc extinguishing work, and finally form Figure 11 Schematic diagram of the direction of arc ③.

[0074] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. An arc extinguishing device for a switch unit, characterized in that: include: An arc extinguishing mechanism having a lower end arranged corresponding to the position of the static contact (100) and an upper end arranged corresponding to the opening position of the movable contact, and two sides respectively representing an arc inlet side and an arc outlet side, comprising a plurality of arc extinguishing grids and a first insulating member (600); The plurality of arc-extinguishing grids include a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids; A plurality of first arc-extinguishing grids are located in a first arc-extinguishing space below a first insulating member (600), the first arc-extinguishing grids being arranged vertically or inclined relative to the vertical, and the plurality of first arc-extinguishing grids being sequentially distributed from the arc-entry side to the arc-exit side to form a first arc-extinguishing grid group (410); The plurality of second arc-extinguishing grids are located in a second arc-extinguishing space above the first insulating member (600), and the second arc-extinguishing grids are arranged in a transverse or oblique direction and are sequentially distributed along the longitudinal direction to form a second arc-extinguishing grid group (420).

2. The arc extinguishing device of the switch unit according to claim 1, characterized in that: The first arc-extinguishing grid in the first arc-extinguishing space is arranged vertically or obliquely at an angle α relative to the vertical, where α is ≤ 30°.

3. The arc extinguishing device of the switch unit according to claim 1, characterized in that: The first insulating member (600) is a first insulating partition arranged in a transverse or oblique direction, and a first notch (610) for guiding the arc to enter is provided on a side facing the moving contact (200).

4. The arc extinguishing device of the switch unit according to claim 1, characterized in that: The first insulating member (600) is arranged obliquely, with the side close to the arc-out side higher than the side close to the arc-in side; the first arc-extinguishing grids of the first arc-extinguishing grid group (410) are arranged in an oblique line shape, with the side close to the arc-out side higher than the side close to the arc-in side.

5. The arc extinguishing device of the switch unit according to claim 1, characterized in that: The second arc-extinguishing grid group (420) is arranged in an L-shaped configuration, comprising a third arc-extinguishing grid group (421) longitudinally arranged above the first insulating member (600) and a fourth arc-extinguishing grid group (422) laterally arranged from the upper end of the third arc-extinguishing grid group (421) toward the moving contact (200) located in the opening position; the second arc-extinguishing grids constituting the third arc-extinguishing grid group (421) are arranged in parallel, and the second arc-extinguishing grids constituting the fourth arc-extinguishing grid group (422) are arranged in parallel, with a certain angle formed between the two groups, and the two groups are transitionally connected via a fifth arc-extinguishing grid group (423) that is sequentially arranged in a fan-shaped manner.

6. The arc extinguishing device of the switch unit according to claim 1, characterized in that: The arc extinguishing mechanism comprises an arc striking assembly, the arc striking assembly comprises a static arc striking piece (510), an intermediate arc striking piece (520), and a dynamic arc striking piece (530), the static arc striking piece (510) is arranged close to the arc-entry side of the lower end of the arc extinguishing mechanism, the intermediate arc striking piece (520) comprises a first plate (521) and a second plate (522), the dynamic arc striking piece (530) is arranged close to the arc-entry side of the upper end of the arc extinguishing mechanism, and the first plate (521) is vertically or obliquely arranged. The second plate (522) is arranged in a horizontal or oblique direction, the upper end of the first plate (521) is bent and connected to an end of the second plate (522) away from the arc-entering side, the first arc-extinguishing grid is distributed between the static arc-striking plate (510) and the first plate (521), the second plate (522) is located above the first insulating member (600), and the second arc-extinguishing grid is distributed between the second plate (522) and the dynamic arc-striking plate (530).

7. The arc extinguishing device of the switch unit according to claim 1, characterized in that: The arc extinguishing mechanism comprises a narrow gap component, which is composed of two gas-producing plates (800). The two gas-producing plates (800) are arranged at a certain distance to form a narrow gap space. The static contact (110) of the static contact (100) is fixed in the narrow gap space, and the moving contact (210) of the moving contact (200) moves in the narrow gap space. The gas-producing plate (800) is provided with a magnetizing plate (810) on the back side of the gas-producing plate (800) relative to the narrow gap space, and the magnetizing plate (810) is provided on a side of the gas-producing plate (800) close to the moving contact (200) located in the opening position.

8. A circuit breaker, characterized in that: include: case; A static contact (100) comprises a conductive plate (120), wherein a static contact point (110) is provided on the conductive plate (120); The moving contact (200) has a moving contact point (210) and can rotate relative to the housing about a pivot to have a closing position and an opening position, and the static contact point (110) is located on one side of a moving track of the moving contact point (210) rotating about the pivot axis; And, an arc extinguishing device of a switch unit as described in any one of claims 1 to 6 is arranged in a housing, wherein the first insulating member (600) is arranged higher than the conductive plate (120), and a plurality of first arc extinguishing grids are located in a first arc extinguishing space formed below the first insulating member (600) and on the side of the first insulating member (600).

9. The circuit breaker according to claim 8, wherein: The static contact (100) comprises a connecting plate (130) and a terminal plate (140); the conductive plate (120), the connecting plate (130), and the terminal plate (140) are connected in sequence; the conductive plate (120) and the connecting plate (130) are bent and connected to form a height difference therebetween; a second insulating member (700) is provided; the second insulating member (700) is located between the connecting plate (130) and the first insulating member (600) and is spaced a certain distance from the first insulating member (600); the first insulating member (600), the side surface of the conductive plate (120), and the second insulating member (700) form a first arc extinguishing space for accommodating a first arc extinguishing grid group (410).

10. The circuit breaker according to claim 9, wherein: The second insulating member (700) includes a second insulating plate (710), the second insulating plate (710) is provided with a through opening (711) for the conductive plate (120) to pass through, the connecting plate (130) is fixed to the lower surface of the second insulating plate (710), and the conductive plate (120) is located above the second insulating plate (710).

11. The circuit breaker according to claim 10, wherein: A first protrusion (720) and a second protrusion (730) are respectively provided at both ends of the second insulating plate (710); the first protrusion (720) is wrapped around a portion where the conductive plate (120) and the connecting plate (130) are bent and connected, and an edge of the first protrusion (720) is close to the static contact (110); the second protrusion (730) is located on a side of the first plate body (521) away from the first arc-extinguishing grid group (410), and the upper end of the second protrusion (730) extends to the height position of the second arc-extinguishing grid group (420).

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