An arc chamber for a switch

Abstract

An arc extinguishing chamber of a switch, the arc extinguishing chamber comprising a pair of side walls, a grid set, a moving arc striking piece and a static arc striking piece, the grid set being located between the pair of side walls; the grid set comprising at least short grids and long grids; the moving arc striking piece comprising a moving arc striking piece base and a moving arc striking piece extension, the static arc striking piece comprising a static arc striking piece base and a static arc striking piece extension, the static arc striking piece base being located at the other end of the grid set in the array direction of the grids, the moving arc striking piece extension and the static arc striking piece extension being close to each other, the closest distance therebetween forming an arc inlet; the distance between the top end of the moving arc striking piece base and the long grids in the array direction of the grids being D1; the electrical gap between the long grids and the moving arc striking piece extension being D2; the distance between the top end of the moving arc striking piece base and the top end of the static arc striking piece base being D3, the width of the arc inlet being D4, the ratio of D1 to D2 being greater than the ratio of D3 to D4. Advantage: preventing arc restriking at the arc inlet, improving the arc extinguishing ability of the arc extinguishing chamber.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-voltage electrical apparatus, and particularly relates to an arc-extinguishing chamber of a switch. BACKGROUND

[0002] The switch is an important power distribution equipment, which is connected to the power supply network to protect the downstream load from the damage of fault current. However, with the development of new energy, the use of DC switch is more and more common, and the voltage requirement is also increasing. New requirements are put forward for the existing switch.

[0003] The contact arc-extinguishing system of the DC switch usually adopts a mode of using a contact mechanism to match multiple contact pieces, and cooperating with multiple layers of stacked (also called "stacked" or "array") arc-extinguishing grid pieces for arc-extinguishing. With the development of new energy technology, the rated working voltage of the DC switch is higher and higher, and the requirement for the arc-extinguishing chamber is also higher and higher. The arc-extinguishing chamber is provided with an array of grid pieces, an arc-guiding piece is arranged at one end of the array of grid pieces in the array direction, the arc-guiding piece includes a moving arc-guiding piece close to the moving contact side of the contact system and a static arc-guiding piece close to the static contact side of the contact system, and the moving and static arc-guiding pieces are responsible for guiding the electric arc into the arc-extinguishing chamber to contact with the grid pieces. Therefore, the cooperation of the arc-guiding piece and the grid piece is particularly important. SUMMARY

[0004] The task of the present application is to provide an arc-extinguishing chamber of a switch, which prevents the electric arc from restriking at the arc inlet by optimizing the cooperation size between the grid piece and the moving and static arc-guiding pieces, and improves the arc-extinguishing ability of the arc-extinguishing chamber.

[0005] The task of the present application is accomplished in this way. An arc-extinguishing chamber of a switch, the arc-extinguishing chamber includes a pair of side walls, an array of grid piece groups, a moving arc-guiding piece and a static arc-guiding piece, and the grid piece groups are located between the pair of side walls; the grid piece groups at least include short grid pieces and long grid pieces, the short grid pieces are located in the array direction of the long grid pieces and close to the end of the moving arc-guiding piece;

[0006] The moving arc-guiding piece includes a moving arc-guiding piece base and a moving arc-guiding piece extension, the moving arc-guiding piece base is arranged at one end of the array direction of the grid piece groups, the static arc-guiding piece includes a static arc-guiding piece base and a static arc-guiding piece extension, the static arc-guiding piece base is arranged at the other end of the array direction of the grid piece groups, and the moving arc-guiding piece extension and the static arc-guiding piece extension are close to each other, and the closest distance forms an arc inlet;

[0007] The distance between the top end of the moving arc-guiding piece base and a group of long grid pieces in the array direction of the grid pieces is D1; the electrical gap between the long grid pieces and the moving arc-guiding piece extension is D2; the distance between the top end of the moving arc-guiding piece base and the top end of the static arc-guiding piece base is D3, the width of the arc inlet is D4, and the ratio of D1 to D2 is greater than the ratio of D3 to D4.

[0008] In another specific embodiment of the present application, the short grid fins are two groups, respectively located at the two ends of the long grid fin array direction.

[0009] In another specific embodiment of the present application, the arc extinguishing chamber further comprises a gas generating member, the gas generating member is a pair of members, respectively attached to the inner side of the grid fin leg of the grid fin of the grid fin group.

[0010] In another specific embodiment of the present application, the long grid fin comprises a long grid fin arc cutting part and a long grid fin leg, the long grid fin leg is a pair of legs extending downward from both sides of the long grid fin arc cutting part.

[0011] In another specific embodiment of the present application, the moving arc guiding fin extension section is a straight strip, which is bent at an obtuse angle with the moving arc guiding fin base.

[0012] In another specific embodiment of the present application, the moving arc guiding fin further comprises an outward expansion section, the moving arc guiding fin base is connected to one end of the moving arc guiding fin extension section, and the other end of the moving arc guiding fin extension section is connected to one end of the outward expansion section.

[0013] In another specific embodiment of the present application, the outward expansion section is at an acute angle with the moving arc guiding fin extension section and extends outward of the arc extinguishing chamber.

[0014] In another specific embodiment of the present application, the moving arc guiding fin base is arranged in parallel with the grid fin of the grid fin group, and the static arc guiding fin base is arranged in parallel with the grid fin of the grid fin group.

[0015] The present application has the beneficial effects of preventing arc restriking at the arc inlet and improving the arc extinguishing ability of the arc extinguishing chamber by optimizing the cooperation size between the grid fin and the moving arc guiding fin and the static arc guiding fin. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a side sectional view of the contact arc extinguishing system in the first embodiment of the present application.

[0017] Figure 2 It is an exploded schematic view of the grid fin group in the first embodiment of the present application.

[0018] Figure 3 It is a side sectional view of the contact arc extinguishing system in the second embodiment of the present application.

[0019] Figure 4 It is an exploded schematic view of the grid fin group in the second embodiment of the present application.

[0020] Figure 5A schematic view of the gas-producing member coated grid leg according to the present application;

[0021] Figure 6 A schematic view of the long grid leg according to the present application;

[0022] Figure 7 A schematic view of the improved embodiment according to the present application; DETAILED DESCRIPTION

[0023] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the description of the embodiments is not a limitation on the technical solutions, and any formal but not substantial changes made in accordance with the concept of the present application should be considered as the protection scope of the present application.

[0024] In the following description, any directional or positional concepts of up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and therefore should not be understood as a special limitation on the technical solutions provided by the present application.

[0025] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 A schematic view of the first embodiment. The structural schematic view of the contact arc extinguishing system. The switch includes an arc extinguishing chamber 1 and a contact system 2, and the aforementioned arc extinguishing chamber 1 is located in the opening direction of the aforementioned contact system 2.

[0026] Specifically, the aforementioned contact system 2 includes a moving contact 21 and a stationary contact 22, and the aforementioned moving contact 21 is in contact or separated from the aforementioned stationary contact 22 after being actuated, and thus the contact system 2 realizes closing or opening. For the switch, when the switch is in the closed state, the aforementioned moving contact 21 and the stationary contact 22 are in the contact state; when the switch is in the open state, the aforementioned moving contact 21 and the stationary contact 22 are in the separated state.

[0027] See Figure 1 , 2 The aforementioned arc extinguishing chamber 1 includes a pair of side walls 11, an array of grid leg groups 12, a moving arc initiation piece 13 and a stationary arc initiation piece 14. The pair of aforementioned side walls 11 are located on the left and right sides of the arc extinguishing chamber 1, and the grid leg group 12 is located between the aforementioned pair of side walls 11. The aforementioned grid leg group 12 includes a plurality of arrays of grid legs, and each grid leg is arranged at intervals. In this embodiment, the aforementioned grid leg group 12 includes short grid legs 121 and long grid legs 122. The length difference between the short grid legs 121 and the long grid legs 122 is not the overall length of the grid legs, but rather the height difference of the arc cutting part of the grid legs. The overall length often also includes the grid leg part of the grid legs. The aforementioned short grid legs 121 and long grid legs 122 are not specific, but only need to exist two kinds of grid legs with different heights of arc cutting parts, and the grid legs with low height can be called short grid legs 121, and the grid legs with high height can be called long grid legs 122.

[0028] As Figure 2 , the aforementioned long fence 122 is multiple, and the array is a group, and the aforementioned short fence 121 is two groups. The aforementioned one group of long fences 122 is in the middle, and the two groups of short fences 121 are located at both ends of the array direction of the one group of long fences 122, forming a "├" structure. That is, the aforementioned long fence 122 extends to the aforementioned contact system 2 relative to the short fence 121.

[0029] Please see Figure 3 and Figure 4 , Figure 3 and Figure 4 is a schematic diagram of the second embodiment of the present application. The difference from the first embodiment is that the height specification of the cutting arc part of the aforementioned short fence 121 has two kinds, of which the height is high near the aforementioned long fence 122, forming a stepped arrangement. Specifically, it is a two-step ladder.

[0030] The third embodiment, the aforementioned fence group 12 only includes a group of short fences 121 and a group of long fences 122, wherein the aforementioned short fence 121 array is located at the end of the array direction of the aforementioned long fence 122 array near the aforementioned moving arc piece 13.

[0031] Continue to see Figure 1 , 3 , the aforementioned moving arc piece 13 and the static arc piece 14 are respectively located at both ends of the array direction of the arrayed fence group 12, wherein the aforementioned moving arc piece 12 is located at the side of the aforementioned moving contact 21, and the aforementioned static arc piece 14 is located at the side of the aforementioned static contact 22. The aforementioned moving arc piece 13 and the static arc piece 14 both extend to the aforementioned contact system 2. During the extension process, the aforementioned moving arc piece 13 and the static arc piece 14 approach each other, and the closest distance between the two forms an arc entry.

[0032] The swing end of the aforementioned moving contact 21 is located on one side of the aforementioned arc entry and cooperates with the aforementioned moving arc piece 13.

[0033] Specifically, the aforementioned moving arc piece 13 includes a moving arc piece base 131, a moving arc piece extension section 132, and an outward expansion section 133. The aforementioned moving arc piece base 131 connects one end of the aforementioned moving arc piece extension section 132, and the other end of the aforementioned moving arc piece extension section 132 is connected with one end of the aforementioned outward expansion section 133. That is, the aforementioned moving arc piece base 131, moving arc piece extension section 132, and outward expansion section 133 are connected end to end.

[0034] The aforementioned movable arc-inducing plate base 131 is disposed at one end of the aforementioned grid plate group 12 array direction. Preferably, the aforementioned movable arc-inducing plate base 131 is disposed parallel to the grid plates of the aforementioned grid plate group 12, and the aforementioned movable arc-inducing plate extension 132 approaches the interior of the arc-extinguishing chamber 1. Preferably, the aforementioned movable arc-inducing plate extension 132 is straight and forms an obtuse angle bend with the aforementioned movable arc-inducing plate base 131.

[0035] The aforementioned extended section 133 forms an acute angle with the aforementioned moving arc-inducing plate extension section 132 and extends outward from the arc-extinguishing chamber 1. That is, the aforementioned second extension section 132 is straight and forms an acute angle bend with the aforementioned moving arc-inducing plate extension section 132.

[0036] The aforementioned extended section 133 is used to cooperate with the aforementioned moving contact 21. Specifically, the aforementioned extended section 133 is located above the swing trajectory of the swing end of the aforementioned moving contact 21.

[0037] In this embodiment, the aforementioned moving arc plate extension segment 132 is a straight line segment. Of course, the aforementioned moving arc plate extension segment 132 can also be composed of two bent straight line segments, or more.

[0038] like Figure 1 , 3 The distance D1 between the top of the base 131 of the aforementioned movable arc-drawing plate 13 and a group of long grid plates 122 in the grid plate array direction is the distance between the top of the base 131 of the aforementioned movable arc-drawing plate and its nearest long grid plate 122 in the grid plate array direction. The top of the aforementioned base 131 of the movable arc-drawing plate refers to the end of the aforementioned base 131 of the movable arc-drawing plate that is away from the aforementioned extension 132 of the movable arc-drawing plate.

[0039] Please see Figure 5 The aforementioned arc-extinguishing chamber 1 also includes a gas-generating component 100. The aforementioned gas-generating component 100 is a pair, which are respectively attached to the inner side of the grid leg of the grid plate, or the aforementioned gas-generating component 100 covers the grid leg.

[0040] Please see Figure 6 The aforementioned long grid plate 122 includes a long grid plate arc cutting portion 1221 and long grid plate legs 1222. The aforementioned long grid plate legs 1222 are a pair, extending downwards from both sides of the aforementioned long grid plate arc cutting portion 1221. The aforementioned long grid plate arc cutting portion 1221 is located within the area encompassed by the moving arc-inducing plate 13 and the stationary arc-inducing plate 14. The aforementioned long grid plate legs 1222 are located on both sides of the aforementioned moving arc-inducing plate 13 and the stationary arc-inducing plate 14. More precisely, the moving arc-inducing plate extension 132 and the outwardly expanding portion 133 of the moving arc-inducing plate 13 are located between the pair of long grid plate legs 1222.

[0041] The static arc-attraction piece 14 also includes a static arc-attraction piece base 141 and a static arc-attraction piece extension 142. The static arc-attraction piece base 141 is arranged at the other end of the array direction of the grid piece group 12. Preferably, the static arc-attraction piece base 141 is arranged in parallel with the grid piece. The static arc-attraction piece extension 142 is arranged from the static arc-attraction piece base 141 to the inside of the arc-extinguishing chamber 1. The static arc-attraction piece extension 142 of the static arc-attraction piece 14 is also located between the pair of long grid piece legs 1222.

[0042] The electrical gap between the long grid piece 122 and the dynamic arc-attraction piece extension 132 is D2. If the long grid piece 122 only includes the long grid piece arc-cutting part 1221, the electrical gap D2 is between the long grid piece arc-cutting part 1221 and the dynamic arc-attraction piece extension 132. If the long grid piece 122 also includes the long grid piece leg 1222, the electrical gap D2 is between the long grid piece arc-cutting part 1221 and the long grid piece leg 1222 that is closest to the dynamic arc-attraction piece extension 132. Furthermore, if the long grid piece leg 1222 is covered by the gas-producing member 100, the electrical gap D2 is usually between the long grid piece arc-cutting part 1221 and the dynamic arc-attraction piece extension 132. The reason is that, when the long grid piece leg 1222 is covered by the gas-producing member 100, the electrical gap between the long grid piece leg 1222 and the dynamic arc-attraction piece extension 132 needs to bypass the gas-producing member 100, which is much larger than the electrical gap without the gas-producing member 100.

[0043] As shown in FIG. 1, the long grid piece 122 includes a long grid piece arc-cutting part 1221 and a long grid piece leg 1222. The long grid piece arc-cutting part 1221 is arranged at the other end of the array direction of the grid piece group 12. Preferably, the long grid piece arc-cutting part 1221 is arranged in parallel with the grid piece. The long grid piece leg 1222 is arranged from the long grid piece arc-cutting part 1221 to the inside of the arc-extinguishing chamber 1. Figure 6 The long grid piece arc-cutting part 1221 is provided with a cutting part edge 1223 at the side close to the long grid piece leg 1222. The cutting part edge 1223 is located between the pair of long grid piece legs 1222. In this embodiment, the cutting part edge 1223 is in the shape of “∧”, i.e., the cutting part edge 1223 is a bent line, forming a gap.

[0044] Continuing to see Figure 1 And Figure 3 The distance between the dynamic arc-attraction piece 13 and the static arc-attraction piece 14 in the array direction of the entire grid piece group 12 is D3, i.e., the distance between the top end of the dynamic arc-attraction piece base 131 of the dynamic arc-attraction piece 13 and the top end of the static arc-attraction piece base 141 of the static arc-attraction piece 14. The top end of the dynamic arc-attraction piece base 131 refers to the end of the dynamic arc-attraction piece base 131 away from the dynamic arc-attraction piece extension 132. Similarly, the top end of the static arc-attraction piece base 141 refers to the end of the static arc-attraction piece base 141 away from the static arc-attraction piece extension 142.

[0045] The width of the arc entrance formed by the aforementioned moving arc blade 13 and the aforementioned static arc blade 14 is D4. In order to ensure that the arc does not retreat to the aforementioned arc entrance when it retreats after entering the grid plate group 12 due to the rapid increase of the arc voltage, it only retreats to the aforementioned long grid plate 122. That is, to ensure that the breakdown only occurs at D2, not at D4. It is required that D1 / D2 is greater than D3 / D4, that is, the distance between the top of the aforementioned moving arc blade base 131 and the long grid plate group 122 in the grid plate array direction is D1; the electrical gap between the aforementioned long grid plate 122 and the aforementioned moving arc blade extension 132 is D2; the distance between the top of the aforementioned moving arc blade base 131 and the top of the static arc blade base 141 is D3, and the width of the aforementioned arc entrance is D4. The ratio of D1 to D2 is greater than the ratio of D3 to D4.

[0046] Please refer to Figure 7 For the long grid plate 122, a pair of positioning recesses 200 are arranged on the inner side of a pair of long grid plate legs 1222 and on the aforementioned long grid plate arc cutting part 1221. The aforementioned positioning recesses 200 are matched with the bosses 101 on the gas generating member 100 that covers the long grid plate legs 1222, that is, the aforementioned bosses 101 are inserted into the aforementioned recesses 200, thereby positioning the top of the gas generating member 100. Preferably, the aforementioned bosses 101 are multiple and arrayed in a comb shape. Similarly, the short grid plate 121 also has recesses 200, which will not be repeated.

Claims

1. An arc-extinguishing chamber for a switch, the arc-extinguishing chamber (1) comprising a pair of sidewalls (11), an array of grid plates (12), a moving arc-drawing plate (13), and a stationary arc-drawing plate (14), the grid plate array (12) being located between the pair of sidewalls (11); the grid plate array (12) comprising at least short grid plates (121) and long grid plates (122), the short grid plates (121) being arrayed and located in the array direction of the long grid plates (122) and close to the end of the moving arc-drawing plate (13); The moving arc-drawing plate (13) includes a moving arc-drawing plate base (131) and a moving arc-drawing plate extension (132). The moving arc-drawing plate base (131) is located at one end of the array direction of the grid plate group (12). The stationary arc-drawing plate (14) includes a stationary arc-drawing plate base (141) and a stationary arc-drawing plate extension (142). The stationary arc-drawing plate base (141) is located at the other end of the array direction of the grid plate group (12). The moving arc-drawing plate extension (132) and the stationary arc-drawing plate extension (142) are close to each other, and the closest point forms an arc inlet. Its features are: The distance between the top of the moving arc-inducing plate base (131) and a set of long grid plates (122) in the grid plate array direction is D1; ​​the electrical clearance between the long grid plates (122) and the moving arc-inducing plate extension (132) is D2; the distance between the top of the moving arc-inducing plate base (131) and the top of the stationary arc-inducing plate base (141) is D3; the width of the arc inlet is D4; and the ratio of D1 to D2 is greater than the ratio of D3 to D4.

2. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The short grids (121) are in two groups, and after arraying, they are located at both ends of the array direction of the long grids (122).

3. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The arc-extinguishing chamber (1) further includes a gas-generating component (100), which is a pair and is respectively attached to the inner side of the grid leg of the grid plate of the grid plate group (12).

4. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The long grid plate (122) includes a long grid plate arc cutting section (1221) and long grid plate legs (1222). The long grid plate legs (1222) are a pair, extending downward from both sides of the long grid plate arc cutting section (1221).

5. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The extension section (132) of the moving arc plate is straight and forms an obtuse angle bend with the base (131) of the moving arc plate.

6. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The movable arc-drawing plate (13) further includes an expansion section (133), the base (131) of the movable arc-drawing plate is connected to one end of the extension section (132) of the movable arc-drawing plate, and the other end of the extension section (132) of the movable arc-drawing plate is connected to one end of the expansion section (133).

7. The arc-extinguishing chamber of a switch according to claim 6, characterized in that: The outer extension section (133) forms an acute angle with the moving arc-inducing plate extension section (132) and extends outward from the arc-extinguishing chamber (1).

8. The arc-extinguishing chamber of a switch according to claim 6, characterized in that: The moving arc-drawing plate base (131) and the grid plates of the grid plate group (12) are arranged in parallel, and the stationary arc-drawing plate base (141) and the grid plates of the grid plate group (12) are arranged in parallel.

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