Switch with arc extinguish chamber
By setting a gas containment cavity below the moving arc ignition plate to buffer the arc gas, the problem of insulation breakdown caused by arc diffusion is solved, and the breaking performance of the switch is improved.
Patent Information
- Application Number
- CN202423321700.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing moving contact structures, electric arcs can easily spread downwards into the contact cavity, leading to a decrease in the strength of the insulating medium, making it prone to breakdown and ultimately causing disconnection failure.
An arc-starting plate mounting boss and a blocking block are set below the moving arc-starting plate to form a gas-containing cavity, which is used to buffer the arc gas and reduce its downward flow.
It effectively reduces the downward flow of arc gas, increases the arc extinguishing speed, and enhances the breaking capacity of the switch.
Smart Images
Figure CN223858044U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to low voltage electrical apparatus technical field, and specifically relates to a switch with arc extinguishing chamber. BACKGROUND
[0002] Switch, especially disconnecting switch as important low voltage electrical apparatus, its realization carries the current on-off control to satisfy the management of power supply network on-off.
[0003] The existing movable contact structure adopts the form of long and short movable contact pieces, wherein the short contact piece is used for carrying the current through when the switch is closed, and the long contact piece is used for carrying the current and starting arc, so that the functions of carrying the current and starting arc are completed by different contact pieces. This setting shortens the distance between the arc starting position and the arc extinguishing chamber, which is beneficial to the extinction of the arc. However, due to the ionized gas containing metal vapor generated when the arc is generated, the ionized gas will diffuse downward into the contact chamber under the action of the air flow field or the electromagnetic field. At this time, the insulation medium strength at this place is reduced, and breakdown is very easy to occur. Moreover, under the structure of the long and short movable contact pieces, once the breakdown occurs at the short movable contact piece, the arc will retreat, which will cause the failure of breaking. This is also a problem that the ordinary skilled in the art has been trying to solve. SUMMARY
[0004] The utility model discloses a switch with arc extinguishing chamber, and a gas containing cavity is formed by the arc starting piece mounting boss and the blocking block below the movable arc starting piece. The arc gas located on one side of the movable arc starting piece is buffered in the containing cavity, and the downward flow of the arc gas is reduced.
[0005] The utility model discloses a switch with arc extinguishing chamber, and a gas containing cavity is formed by the arc starting piece mounting boss and the blocking block below the movable arc starting piece. The arc gas located on one side of the movable arc starting piece is buffered in the containing cavity, and the downward flow of the arc gas is reduced.
[0006] In one specific embodiment of the utility model, the pair of gas generating pieces includes a first gas generating piece and a second gas generating piece, and the first gas generating piece and the second gas generating piece are respectively used for wrapping a corresponding one of the pair of grid piece legs of the grid piece.
[0007] In another specific embodiment of the utility model, the first gas production part includes a first substrate, the second gas production part includes a second substrate, when the first gas production part and the second gas production part are both installed in place, the first substrate and the second substrate are arranged at intervals, and an arc channel is formed therebetween.
[0008] In still another specific embodiment of the utility model, the blocking block includes a first blocking block and a second blocking block, the first blocking block is arranged on the first substrate, and the second blocking block is arranged on the second substrate.
[0009] In still another specific embodiment of the utility model, the blocking block is arranged on the first substrate or the second substrate.
[0010] In still another specific embodiment of the utility model, the first blocking block is provided with a male card matching part, correspondingly, the second blocking block is provided with a female card matching part, and the male card matching part and the female card matching part are spliced.
[0011] In still another specific embodiment of the utility model, the first substrate has a first expansion edge, and an expansion side of the first expansion edge is located on a side corresponding to the moving contact; correspondingly, the second substrate has a second expansion edge, and an expansion side of the second expansion edge is located on a side corresponding to the moving contact.
[0012] In still another specific embodiment of the utility model, the first substrate has a first expansion edge, and an expansion side of the first expansion edge is located on a side corresponding to the moving contact; correspondingly, the second substrate has a second expansion edge, and an expansion side of the second expansion edge is located on a side corresponding to the moving contact.
[0013] In still another specific embodiment of the utility model, the first substrate has a third expansion edge, and an expansion side of the third expansion edge is located on a side corresponding to the fixed contact; correspondingly, the second substrate has a fourth expansion edge, and an expansion side of the fourth expansion edge is located on a side corresponding to the fixed contact.
[0014] In still another specific embodiment of the utility model, the outer edge of the arc piece mounting boss is matched with the curved shape of the moving arc piece, the moving arc piece is sleeved on the arc piece mounting boss, the right side of the accommodating cavity is the shell of the switch, and the left side of the accommodating cavity is open.
[0015] Due to the above-mentioned structure, this utility model has the following beneficial effects: Below the moving arc igniter, a gas receiving cavity is formed by the arc igniter mounting boss and the blocking block. This receiving cavity buffers the arc gas located on one side of the moving arc igniter and reduces the downward flow of the arc gas, which is conducive to the rapid extinguishing of the arc and improves the breaking capacity of the switch. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the contact and arc-extinguishing chamber described in this utility model;
[0017] Figure 2 This is a three-dimensional structural diagram of the arc-extinguishing chamber described in this utility model;
[0018] Figure 3 This is an explosion diagram of the arc-extinguishing chamber described in this utility model;
[0019] Figure 4 This is a schematic diagram of the inner side of the first gas-generating component of this utility model;
[0020] Figure 5 This is a schematic diagram of the inner side of the second gas-generating component of this utility model;
[0021] Figure 6 This is a schematic diagram of the structure of the moving contact described in this utility model.
[0022] In the figure: 1. Sidewall; 2. Grid plate; 3. Arc-extinguishing chamber cover; 4. Gas generating component; 41. First gas generating component; 411. First substrate; 4111. First grid plate mating notch; 4112. First extension edge; 4113. First extension portion; 4114. Third extension edge; 4115. First mating edge; 412. First blocking block; 4121. Male clamping portion; 4122. First screw hole; 42. Second gas generating component; 421. Second substrate; 4211. Second grid plate mating notch; 4212. Second extension edge; 4213. Second extension portion; 4 214. Fourth extension edge; 4215. Second mating edge; 422. Second blocking block; 4221. Female clamp mating part; 4222. Second screw hole; 423. Arc-starting plate mounting boss; 5. Anti-ionization device; 51. Anti-ionization component; 52. Insulating plate assembly; 6. Moving arc-starting plate; 7. Insulating sleeve; 10. Moving contact; 101. Moving contact piece; 1011. Long contact piece; 10111. Moving arc contact; 1012. Short contact piece; 10121. Moving main contact; 102. Contact cover; 20. Stationary contact; 30. Arc-extinguishing chamber; 100. Positioning component. Detailed Implementation
[0023] The specific embodiments of the utility model will be described in detail below in combination with the drawings, but the description of the embodiments is not a limitation on the technical solutions, and any formal but not substantial changes according to the utility model concept should be regarded as the protection scope of the utility model.
[0024] In the following description, the directional or positional concepts of up, down, left, right, front and back are all based on the positions shown in the corresponding drawings, which are only provided for the technical solutions of the utility model and simplify the description, and thus should not be understood as the special limitation on the technical solutions of the utility model.
[0025] As Figure 1 , the switch includes a contact system, the contact system includes a moving contact 10 and a static contact 20, the moving contact 10 is in contact or separated from the static contact 20 after rotating, the contact system is installed inside the shell of the switch, and usually the contact system is installed in a contact cavity inside the shell.
[0026] An arc extinguishing chamber 30 is arranged above the moving contact 10 and the static contact 20, when the moving contact 10 and the static contact 20 are separated, an arc is generated, the arc enters the inside of the arc extinguishing chamber 30 and is extinguished in the arc extinguishing chamber 30.
[0027] As Figure 2 , Figure 3 is a schematic view of the arc extinguishing chamber 30. The arc extinguishing chamber 30 includes a pair of side walls 1, a plurality of fins 2 and an arc extinguishing chamber cover 3, the fins 2 are arranged in an array between the pair of side walls 1 at intervals. The arc extinguishing chamber cover 3 is located at the top of the arc extinguishing chamber 30, and a ventilation hole is formed in the arc extinguishing chamber cover 3. The pair of side walls 1 and the arc extinguishing chamber cover 3 form the outer shell of the arc extinguishing chamber 30.
[0028] In the embodiment, the pair of side walls 1 are tightened by screws after splicing, and the arc extinguishing chamber cover 3 is fixed on the top of the pair of side walls 1 from above, and is also fixed by screws.
[0029] Usually, the side wall 1 and the arc extinguishing chamber cover 3 are made of thermosetting materials, such as DMC or BMC. In order to meet the requirements of materials and processes, a plurality of process cavities are formed on the outer side of the side wall 1.
[0030] The arc extinguishing chamber 30 also includes a gas generating member 4, the gas generating member 4 is a pair of first gas generating members 41 and second gas generating members 42. The first gas generating member 41 and the second gas generating member 42 are respectively used for wrapping a corresponding one of a pair of fin legs of the fin 2. When the gas generating member 4 is installed, an arc passage is formed between the first gas generating member 41 and the second gas generating member 42, and in the embodiment, the arc passage is formed in a narrow slot structure.
[0031] The plurality of grid plates 2 are arranged in parallel and spaced apart from each other. In the embodiment, the plurality of grid plates 2 are grouped into a plurality of grid plate groups according to design requirements, and the plurality of grid plate groups are arranged in sequence to form the illustrated grid plate group.
[0032] The grid plate 2 includes a cutting area and a pair of grid plate legs extending downward from both sides of the cutting area. The cutting area is used for cutting the arc to increase the arc voltage. The pair of grid plate legs is used to provide a magnetic field to attract the arc into the cutting area.
[0033] The grid plate 2 has positioning notches on both sides, which are located on both sides of the width direction of the grid plate 2, and are used for cooperation with the positioning member 100 for installation. Preferably, the positioning notches are located on the outer sides of the pair of grid plate legs. In terms of the height direction of the arc-extinguishing chamber 30, the positioning notches on both sides are at the same height. The positioning member 100 is used for positioning between the plurality of grid plates 2.
[0034] The arc-extinguishing chamber 30 further includes a deionization device 5 located at the gas outlet of the grid plate 2 and between the grid plate 2 and the arc-extinguishing chamber cover 3, which is used for deionization of the arc gas to prevent arc flying. The deionization device 5 includes a deionization assembly 51 and an insulating plate assembly 52.
[0035] More specifically, the insulating plate assembly 52 is located above the grid plate 2, and the deionization assembly 51 is located above the insulating plate assembly 52. In the embodiment, the deionization assembly 51 is two and arranged in a stack, and the insulating plate assembly 52 is also two and arranged in a stack.
[0036] The arc-extinguishing chamber 30 further includes a moving arc guiding plate 6 corresponding to the moving contact 10, which guides the arc into the array of grid plates 2.
[0037] In order to improve the insulation, the arc-extinguishing chamber 30 further includes an insulating sleeve 7, which is provided in the pair of side walls 1, and the screws for fixing the pair of side walls 1 pass through the insulating sleeve 7 to achieve screw fixing. The insulating sleeve 7 can prevent the arc gas from contacting the screws to prevent breakdown.
[0038] As Figure 4 , Figure 5The first gas generating member 41 comprises a first base plate 411, which forms a side wall of one side of the arc channel in the arc extinguishing chamber 30. Correspondingly, the second gas generating member 42 comprises a second base plate 421, which forms a side wall of the other side of the arc channel. When the first gas generating member 41 and the second gas generating member 42 are both installed in place, the first base plate 411 and the second base plate 421 are arranged in a spaced manner, and the arc channel is formed therebetween.
[0039] A first blocking block 412 extends from the first base plate 411 and towards the side of the second base plate 421. Correspondingly, a second blocking block 422 extends from the second base plate 421 and towards the side of the first base plate 411. The first blocking block 412 and the second blocking block 422 are butted to form a complete blocking block. The blocking block can block the downward movement of the arc gas therefrom, thereby preventing the arc gas from contacting the short contact piece on the movable contact 10.
[0040] Preferably, the first blocking block 412 and the second blocking block 422 have concave-convex abutting structures thereon, which ensure the air tightness of the entire blocking block after splicing. Specifically, the first blocking block 412 is provided with a male clamping portion 4121, and the second blocking block 422 is provided with a female clamping portion 4221 corresponding to the male clamping portion 4121. The male clamping portion 4121 and the female clamping portion 4221 are spliced, which improves the air tightness of the blocking block.
[0041] Of course, if the split splicing mode is not adopted, i.e., the blocking block is provided only on the first base plate 411 or the second base plate 421, it is also acceptable.
[0042] The blocking block is hollow, which meets the processing characteristics of thermoplastic materials. The first blocking block 412 has a first screw hole 4122, and the second blocking block 422 has a second screw hole 4222. The first screw hole 4122 and the second screw hole 4222 are arranged correspondingly, a screw passes through the first screw hole 4122 and the second screw hole 4222, and tightens and fixes the pair of side walls 1 and the pair of gas generating members 4.
[0043] The first gobo gap 4111 is located in the middle of the top edge of the first substrate 411, and the second gobo gap 4211 is located in the middle of the top edge of the second substrate 421, both of which are used to cooperate with the gobo 2 in the middle of the array.
[0044] The first extension edge 4112 is located on the first substrate 411 and corresponds to one side of the moving contact 10, and the second extension edge 4212 is located on the second substrate 421 and corresponds to one side of the moving contact 10.
[0045] The first extension part 4113 is located on the first substrate 411 and corresponds to one side of the moving contact 10, and the second extension part 4213 is located on the second substrate 421 and corresponds to one side of the moving contact 10.
[0046] The third extension edge 4114 is located on the first substrate 411 and corresponds to one side of the static contact 20, and the fourth extension edge 4214 is located on the second substrate 421 and corresponds to one side of the static contact 20.
[0047] Therefore, at the entrance of the arc extinguishing chamber 30, the arc channel first narrows and then widens in the direction of the moving contact 10 towards the static contact 20.
[0048] The first extension part 4113 is located on the first substrate 411 and corresponds to one side of the moving contact 10, and the second extension part 4213 is located on the second substrate 421 and corresponds to one side of the moving contact 10.
[0049] Preferably, the blocking block is located in the region between the first extension 4113 and the second extension 4213. Specifically, the first blocking block 412 is arranged on the first extension 4113, and the second blocking block 422 is arranged on the second extension 4213.
[0050] The second substrate 421 is further provided with an arc striking sheet mounting boss 423 for positioning and mounting the movable arc striking sheet 6. In the embodiment, the arc striking sheet mounting boss 423 is directly arranged on the second substrate 421. Of course, the arc striking sheet mounting boss 423 can also be arranged on the first substrate 411, or the arc striking sheet mounting boss 423 can be a split structure, i.e., one part is arranged on the first substrate 411 and the other part is arranged on the second substrate 421, and the two parts are spliced to form a complete arc striking sheet mounting boss 423 after the gas generating member 4 is installed. The outer edge of the arc striking sheet mounting boss 423 matches the curved shape of the movable arc striking sheet 6, and the movable arc striking sheet 6 is sleeved on the arc striking sheet mounting boss 423.
[0051] As Figure 6 The movable contact 10 includes a movable contact sheet 101 and a contact cover 102. The movable contact sheet 101 is rotationally arranged on a contact support of the movable contact 10, and the contact cover 102 is mounted on the contact support. The movable contact sheet 101 includes a long contact sheet 1011 and short contact sheets 1012. The short contact sheets 1012 are located on both sides of the long contact sheet 1011, and the long contact sheet 1011 is in the middle. The long contact sheet 1011 is provided with a movable arc contact 10111, and the short contact sheets 1012 are provided with movable main contacts 10121. The movable arc contact 10111 of the long contact sheet 1011 extends into the internal cavity of the arc extinguishing chamber 30, and the movable main contacts 10121 of the short contact sheets 1012 are located outside the arc extinguishing chamber 30.
[0052] The above arrangement forms a gas containing cavity 200 on the side of the movable contact 10 away from the stationary contact 20 below the movable arc striking sheet 6, with the arc striking sheet mounting boss 423 and the blocking block. The upper edge of the containing cavity 200 is the arc striking sheet mounting boss 423, and the lower edge of the containing cavity 200 is the blocking block. When the arc extinguishing chamber 30 is installed in place, the right side of the containing cavity 200 is the housing of the switch, and the left side of the containing cavity 200 is open. The containing cavity 200 buffers the arc gas on the side of the movable arc striking sheet 6, reduces the downward flow of the arc gas, prevents it from contacting the short contact sheets 1012 of the movable contact 10, and improves the breaking capacity of the switch.
Claims
1. A switch having an arc-extinguishing chamber, comprising a moving contact (10), a stationary contact (20) and an arc-extinguishing chamber (30), said arc-extinguishing chamber (30) comprising a pair of side walls (1), a grid (2) and a pair of gas-generating elements (4) arranged at a distance from each other to form an arc passage, characterized in that: The pair of gas generating members (4) form an arc leading piece mounting boss (423) between them, the moving arc leading piece (6) of the arc extinguishing chamber (30) is sleeved on the arc leading piece mounting boss (423), and a blocking block is also formed between the pair of gas generating members (4), the blocking block is arranged below the arc leading piece mounting boss (423), and the blocking block and the arc leading piece mounting boss (423) form a containing cavity (200) for containing arc gas.
2. A switch having an arc chamber according to claim 1, characterized in that: The pair of gas generating members (4) include a first gas generating member (41) and a second gas generating member (42), and the first gas generating member (41) and the second gas generating member (42) are respectively used for wrapping a corresponding one of a pair of grid legs of the grid (2).
3. A switch having an arc chamber according to claim 2, characterized in that: The first gas generating member (41) includes a first base plate (411), and the second gas generating member (42) includes a second base plate (421), when the first gas generating member (41) and the second gas generating member (42) are both installed in place, the first base plate (411) and the second base plate (421) are arranged in a spaced manner, and an arc passage is formed therebetween.
4. A switch having an arc chamber according to claim 3, characterized in that: The blocking block includes a first blocking block (412) and a second blocking block (422), the first blocking block (412) is arranged on the first base plate (411), and the second blocking block (422) is arranged on the second base plate (421).
5. A switch having an arc chamber according to claim 3, characterized in that: The blocking block is arranged on the first base plate (411) or the second base plate (421).
6. A switch having an arc chamber according to claim 4, characterized in that: The first blocking block (412) is provided with a male clamping part (4121), and correspondingly, the second blocking block (422) is provided with a female clamping part (4221), and the male clamping part (4121) and the female clamping part (4221) are spliced.
7. A switch having an arc chamber according to claim 3, characterized in that: The first base plate (411) has a first extension edge (4112), and an extension side of the first extension edge (4112) is located on a side corresponding to the moving contact (10); correspondingly, the second base plate (421) has a second extension edge (4212), and an extension side of the second extension edge (4212) is located on a side corresponding to the moving contact (10).
8. A switch having an arc chamber according to claim 7, characterized in that: The first base plate (411) has a first extension part (4113) on the extension side of the first extension edge (4112), and the second base plate (421) has a second extension part (4213) on the extension side of the second extension edge (4212), the first extension part (4113) and the second extension part (4213) are arranged in a spaced manner, and a wider area than the arc passage between the first base plate (411) and the second base plate (421) is formed below the moving arc leading piece (6).
9. A switch having an arc chamber according to claim 7, characterized in that: The first substrate (411) has a third extension side (4114) on the side corresponding to the static contact (20); correspondingly, the second substrate (421) has a fourth extension side (4214) on the side corresponding to the static contact (20).
10. A switch having an arc chamber according to claim 1, characterized in that: The outer edge of the arc striking sheet mounting boss (423) matches the curved shape of the moving arc striking sheet (6), the moving arc striking sheet (6) is sleeved on the arc striking sheet mounting boss (423), and the right side of the accommodating cavity (200) is the shell of the switch, and the left side of the accommodating cavity (200) is open.