Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a shell and an arc extinguishing device, a containing cavity used for containing the arc extinguishing device is formed in the shell, and the arc extinguishing device comprises grid pieces arranged in a stacked mode in the height direction and an arc isolating cover used for containing the grid pieces. The device is characterized in that a stopping device used for preventing high-temperature ionized gas from circulating between the arc isolating cover and the accommodating cavity is arranged between the arc isolating cover and the accommodating cavity. The arc-isolating cover has the advantages that the stopping device is arranged between the arc-isolating cover and the containing cavity, the stopping device plays a role in preventing high-temperature ionized gas from circulating between the arc-isolating cover and the containing cavity, and concentrated discharge of the high-temperature ionized gas is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, and specifically relates to a switch. Background Technology

[0002] Switches in power distribution lines connect or disconnect circuits through closing or opening operations. Specifically, the connection or disconnection of the line is achieved by the closing or opening of the moving and stationary contacts of the contact system, thus protecting the line and electrical equipment.

[0003] With the development of new energy sources such as wind power and photovoltaic power generation facilities, the application scenarios of these power generation facilities connecting to the power grid are increasing. Correspondingly, switches that bear the dual functions of circuit protection and control are being used more and more widely in such power distribution systems, and play a very important role in the safety, reliability and practicality of the entire line.

[0004] To meet the requirements for grid connection of the aforementioned new energy power generation facilities, the breaking voltage faced by switches is becoming increasingly higher. Taking molded case switches currently operating in high-voltage DC environments as an example, to improve arc extinguishing performance, it is necessary to control the arc within a predetermined grid group to complete the arc cutting and remove high-temperature ionized gas, while also strengthening the insulation strength of the arc relative to the contact system, enhancing sealing performance, and preventing dielectric breakdown between the contacts under high voltage. However, existing switches often struggle to fully meet the aforementioned requirements unless necessary exploration and reasonable improvements are made. The technical solution described below arose in this context. Utility Model Content

[0005] The objective of this invention is to provide a method that helps prevent the flow of high-temperature ionized gas between the arc-extinguishing device and the cavity, thereby facilitating the concentrated discharge of the high-temperature ionized gas.

[0006] The present invention accomplishes its objective as follows: a switch comprising a housing and an arc-extinguishing device, wherein the housing contains a cavity for accommodating the arc-extinguishing device, and the arc-extinguishing device comprises grids stacked along the height direction and an arc-isolating cover for accommodating the grids, characterized in that: a stop device is provided between the arc-isolating cover and the cavity to prevent high-temperature ionized gas from flowing between the arc-isolating cover and the cavity.

[0007] In one specific embodiment of this utility model, the stop device is formed by an anti-flow stacking edge protruding from the wall of the arc-blocking cover on the side opposite to the grid plate, and the side of the anti-flow stacking edge opposite to the wall of the arc-blocking cover cooperates with the inner wall of the cavity; or, the stop device is formed by an anti-flow stacking edge protruding from the inner wall of the cavity, and the side of the anti-flow stacking edge opposite to the inner wall of the cavity cooperates with the wall of the arc-blocking cover on the side opposite to the grid plate.

[0008] In another specific embodiment of the present utility model, the arc separating cover includes a pair of front arc separating covers arranged face to face with each other and a rear arc separating cover connected to the pair of front arc separating covers. The grid sheet includes an arc cutting body and a pair of grid sheet legs. The pair of grid sheet legs extend at one end of the arc cutting body facing away from the rear arc separating cover in a state of being both parallel to each other and spaced apart from each other, and the shape of the grid sheet is formed into a U shape by the pair of grid sheet legs and the arc cutting body. The pair of front arc separating covers respectively correspond to and envelope the pair of grid sheet legs. The space between the sides of the pair of front arc separating covers facing away from the rear arc separating cover after being fitted face to face with each other constitutes an open slot. On the outer wall of the front arc separating cover on the side where the pair of front arc separating covers face away from each other, there is respectively formed a front arc separating cover outer wall stack edge protruding from the surface of the outer wall of the front arc separating cover. The rear arc separating cover corresponds to the arc cutting body and envelopes the arc cutting body. On the outer wall of the rear arc separating cover on the corresponding two sides and at positions corresponding to the front arc separating cover outer wall stack edge, there is respectively formed a rear arc separating cover outer wall stack edge protruding from the surface of the outer wall of the rear arc separating cover. The stop device is integrally formed by the engagement of the front and rear arc separating cover outer wall stack edges; a rear arc separating cover skirt is formed at the bottom of the rear arc separating cover.

[0009] In yet another specific embodiment of the present utility model, the overall shape of the stop device formed by the engagement of the front arc separating cover outer wall stack edge and the rear arc separating cover outer wall stack edge is in the shape of the Chinese character 'kou'. And on the upper part of this 'kou' shape, there extends an upper mediastinal stack edge upward with the outer wall of the front arc separating cover as the carrier, and on the lower part of this 'kou' shape, there extends a lower mediastinal stack edge downward with the outer wall of the rear arc separating cover as the carrier; the top surface of the upper mediastinal stack edge is flush with the top surfaces of the pair of front arc separating covers, and the bottom of the lower mediastinal stack edge is joined to the rear arc separating cover skirt formed at the bottom of the rear arc separating cover.

[0010] In still another specific embodiment of the present utility model, the housing includes a base and a cover. On the base and at positions corresponding to between each two adjacent arc extinguishing devices, there are formed base partitions, and on the cover and at positions corresponding to the base partitions, there are provided cover partitions at intervals. The cavity is jointly formed by the cover partition cavity and the base partition cavity. When the cover is fitted with the base, the cover partition and the base partition are spliced. The interval distance between adjacent base partitions is less than the interval distance between adjacent cover partitions, so that a step is formed at the joint of the inner wall of the cavity. The upper mediastinal stack edge, the front arc separating cover outer wall stack edge, and the rear arc separating cover outer wall stack edge cooperate with the inner side wall of the cover partition cavity, and the bottom of the front arc separating cover outer wall stack edge and the bottom of the rear arc separating cover outer wall stack edge contact the step, and the lower mediastinal stack edge cooperates with the inner side wall of the base partition cavity.

[0011] In a further specific embodiment of this utility model, a contact system is provided on the base. This contact system includes a stationary contact and a moving contact. The stationary contact is fixed to the base, and the moving contact rotatably separates from or closes with the stationary contact. The stationary contact includes a stationary contact guide rod, one end of which forms a stationary contact fixing end, and the other end forms a wiring terminal. A middle fixing end is formed in the middle of the stationary contact fixing end, extending towards the wiring terminal. A stationary contact is fixed to the upper surface of this middle fixing end, and a... There is a pair of stationary contacts two that are mirror images of stationary contact one; the moving contact includes a central long guide rod, moving guide rods on both sides thereof, a moving contact one fixed on the central long guide rod and cooperating with stationary contact one, a moving contact two fixed on the moving guide rod and cooperating with stationary contact two, and an insulating protective cover fixed on the central long guide rod and corresponding to moving contact two. The central long guide rod extends into the opening groove, while the moving guide rod extends out of the opening groove; the rear arc-isolating cover skirt at the bottom of the rear arc-isolating cover contacts the upper surface of the stationary contact guide rod.

[0012] In a further specific embodiment of this utility model, the stationary contact is provided with a stationary contact arc-blocking cover. The stationary contact arc-blocking cover includes a front panel for covering the front surface of the stationary contact fixing end, a side panel for covering the two sides of the stationary contact fixing end, a rear panel for covering the rear surface of the stationary contact fixing end facing the terminal, a top plate connecting the front panel and the rear panel, a pair of openings respectively provided on both sides of the top plate and a notch opened in the middle of the rear panel. The top plate covers the upper surface of the stationary contact fixing end, and the pair of stationary contacts are exposed outside through the openings. The middle fixing end is accommodated in the notch, and a connecting rib connected to the top plate is provided at the top of the notch.

[0013] In another specific embodiment of this utility model, a closed wing plate extends from each of the pair of front arc-isolating covers. The closed wing plate is located on both sides of the first moving contact on the middle long guide rod and extends from the arc-extinguishing device to the moving contact and passes through the second moving contact. The inner walls of the two facing each other at the bottom of the pair of closed wing plates are engaged with the two end faces of the top plate. The bottom edge of the pair of closed wing plates is engaged with the upper surface of the fixed end of the stationary contact. A groove is also provided at the bottom of each pair of closed wing plates, and the groove is fitted with the connecting rib at the top of the notch.

[0014] In yet another specific embodiment of this utility model, the closed wing plate is formed by the side walls of the pair of front arc-isolating covers extending towards the moving contact. The side walls of the opening slot are formed by the side walls of the pair of closed wing plates and the pair of front arc-isolating covers. The projection of the moving contact point 1 on the pair of side walls when the moving contact is in the open position forms a first recessed side wall. The projection of the insulating protective cover on the pair of side walls forms a second recessed side wall. The distance between the pair of second recessed side walls is greater than the distance between the pair of first recessed side walls.

[0015] In a further specific embodiment of this utility model, on the outer wall of the arc-isolating shield on the opposite side of the arc-isolating shield, there are protruding ribs that are continuous in the height direction of the arc-extinguishing device. The stop device is formed by the ribs. The top of the ribs is flush with the top surface of the arc-isolating shield, and the bottom of the ribs is flush with the bottom surface of the arc-isolating shield.

[0016] The technical effect of the technical solution provided by this utility model is that a stop device is provided between the arc-isolating cover and the cavity, which prevents the high-temperature ionized gas from flowing between the arc-isolating cover and the cavity, and facilitates the concentrated discharge of the high-temperature ionized gas. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the housing of this utility model;

[0018] Figure 2 for Figure 1 AA section view;

[0019] Figure 3 To remove Figure 1 A schematic diagram of the cover of the shell shown;

[0020] Figure 4 A schematic diagram showing the connection between the cover and the arc-extinguishing device;

[0021] Figure 5 A schematic diagram of the moving contact;

[0022] Figure 6 A schematic diagram showing the interaction between the stationary contact and the arc-extinguishing device;

[0023] Figure 7 for Figure 6 Exploded view;

[0024] Figure 8 This is an exploded view of the arc-extinguishing device;

[0025] Figure 9 for Figure 8 A schematic diagram observed from another perspective;

[0026] Figure 10A schematic diagram showing the coordination between the moving contact and the arc-extinguishing device;

[0027] Figure 11 for Figure 10 BB cross-sectional view. Detailed Implementation

[0028] In order to better understand the technical essence and beneficial effects of this utility model, a detailed description will be given below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0029] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the position of the figure being described and should not be construed as a specific limitation on the technical solution provided by this utility model.

[0030] Please see Figure 1 and Figure 2 , Figure 1 The present invention illustrates the housing 1, which is assembled from the base 11 and the cover 12 into one unit, representing the switch structure system of this utility model. Figure 2 for Figure 1 The AA cross-sectional view shows the base 11 constituting the aforementioned housing 1 and the cover 12, as well as the cavity 10, the stationary contact 4, and the stop device 3, which is a key technical feature of this utility model.

[0031] Please see Figures 2 to 9 And combined Figures 1 to 2 The above-mentioned housing 1 and arc-extinguishing device 2 are shown. The housing 1 has a top cover not shown in the figure. The housing 1 has a cavity 10 for accommodating the aforementioned arc-extinguishing device 2. The arc-extinguishing device 2 includes grid plates 21 stacked along the height direction and an arc-blocking cover 22 for accommodating the grid plates 21. Figures 1-5 The given embodiment is a three-pole switch, therefore, three cavities 10 are formed inside the housing 1, and each cavity 10 contains an arc-extinguishing device 2. Of course, it is not limited to the three-pole switch given in the embodiment, but can also be a single-pole, two-pole, or four-pole switch, and correspondingly, the number of cavities 10 is one, two, or four.

[0032] The key technical point of the technical solution provided by this utility model is that a stop device 3 is provided between the arc shield 22 and the cavity 10 to prevent high-temperature ionized gas from flowing between the arc shield 22 and the cavity 10. The stop device 3 is the anti-flow stack edge (the same below).

[0033] In this embodiment, the stop device 3 is composed of an anti-flow stack edge protruding on the wall of the arc-blocking cover 22 on the side opposite to the grid plate 21, and the side of the anti-flow stack edge opposite to the wall of the arc-blocking cover 22 cooperates with the inner wall of the cavity 10.

[0034] The arc extinguishing device 2 mentioned above includes several grid plates 21 stacked along the height direction of the arc extinguishing device 2 and an arc-blocking cover 22 for housing the grid plates 21. In this embodiment, the stacking direction of the several grid plates 21 is actually set along the height direction of the switch.

[0035] Depend on Figures 6 to 9 As shown, and with Figures 6 to 7 Based on the position shown, the aforementioned arc-blocking shield 22 includes a pair of front arc-blocking shields 221 arranged facing each other and a rear arc-blocking shield 222 connected to the pair of front arc-blocking shields 221. The aforementioned grid plate 21 includes an arc-cutting body 211 and a pair of grid plate legs 212. The pair of grid plate legs 212 extend from the end of the arc-cutting body 211 away from the rear arc-blocking shield 222 in a state that is both parallel to each other and spaced apart from each other. The pair of grid plate legs 212 and the aforementioned arc-cutting body 211 together form the shape of the aforementioned grid plate 21 as U-shaped. Figures 8 to 9 As shown), the aforementioned pair of front arc-isolating shields 221 respectively correspond to and enclose the aforementioned pair of grid legs 212. After the pair of front arc-isolating shields 221 are engaged face-to-face, the space between the sides away from the aforementioned rear arc-isolating shield 222 is formed as an opening slot 20. On the side of the pair of front arc-isolating shields 2211 facing away from each other (back to back), a front arc-isolating shield outer wall stack edge 22111 protruding from the surface of the front arc-isolating shield outer wall 2211 is formed. The aforementioned rear arc-isolating shield 222 corresponds to the aforementioned arc-cutting body 211 and The arc cutting body 211 is enclosed, and on the corresponding sides of the outer wall 2221 of the rear arc shield 222, and at positions corresponding to the aforementioned outer wall stack edge 2211 of the front arc shield 222, a rear arc shield outer wall stack edge 22211 is formed, which protrudes from the surface of the rear arc shield outer wall 2221. The aforementioned stop device 3 (i.e. the aforementioned anti-flow stack edge) is formed by the front and rear arc shield outer wall stack edges 22111 and 22211 joining together. A rear arc shield skirt edge 2222 is formed at the bottom of the aforementioned rear arc shield 222.

[0036] The overall shape of the aforementioned stop device 3 formed after the outer wall edge 22111 of the front partition arc cover and the outer wall edge 22211 of the rear partition arc cover are joined to each other is in the shape of a Chinese character "kou", and an upper mediastinal edge 22112 extends upward with the outer wall 2211 of the front partition arc cover as a carrier at the upper part of this "kou" shape, and a lower mediastinal edge 22212 extends downward with the outer wall 2221 of the rear partition arc cover as a carrier at the lower part of this "kou" shape; the top surface of the aforementioned upper mediastinal edge 22112 is flush with the top surface of the aforementioned pair of front partition arc covers 221, and the bottom of the aforementioned lower mediastinal edge 22212 is joined to the rear partition arc cover skirt 2222 formed at the bottom of the aforementioned rear partition arc cover 222.

[0037] As shown in detail, Figure 9 at the upper and lower ends on the opposite sides of the aforementioned pair of front partition arc covers 221, a front partition arc cover buckle 2213 is respectively formed, and on the front and rear wall bodies of the outer wall 2221 of the rear partition arc cover 222 of the aforementioned rear partition arc cover 222 and at positions corresponding to the front partition arc cover buckle 2213, buckle mating parts 22213 are respectively formed. The pair of front partition arc covers 221 and a rear partition arc cover 222 are spliced or assembled together by the mutual clamping of the front partition arc cover buckle 2213 and the buckle mating part 22213.

[0038] The aforementioned housing 1 mentioned above includes a base 11 and a cover 12 that cooperate with each other. On the base 11 and at positions corresponding to between each two adjacent aforementioned arc extinguishing devices 2, base partitions 111 are formed, and on the aforementioned cover 12 and at positions corresponding to the base partitions 111, cover partitions 121 are arranged at intervals. Figure 2 、 3 In the embodiment of the three-pole switch given, the number of cover partitions 121 is two, and the number of base partitions 111 is also two. Three cover partition cavities are respectively formed between the left side wall of the cover 12 and a cover partition 121 close to the left side wall, between a pair of cover partitions 121, and between the right side wall of the cover 12 and a cover partition 121 close to the right side wall. Three base partition cavities are respectively formed between the left side wall of the base 11 and a base partition 111 close to the left side wall, between a pair of base partitions 111, and between the right side wall of the base 11 and a base partition 111 close to the right side wall. After the aforementioned cover 12 and the base 11 are配合, the aforementioned cover partitions 121 and the base partitions 111 are spliced, and the cover partition cavities and the base partition cavities are joined to form the aforementioned cavity 10. The distance between adjacent base partitions 111 is less than the distance between adjacent cover partitions 121, so that a step 101 is formed on the inner wall of the aforementioned cavity 10 at the splicing position ( Figure 3As shown in the diagram, the upper longitudinal partition stack edge 22112, the front partition arc cover outer wall stack edge 22111, and the rear partition arc cover outer wall stack edge 22211 cooperate with the inner sidewall of the cover partition cavity, and the bottom of the front partition arc cover outer wall stack edge 22111 and the bottom of the rear partition arc cover outer wall stack edge 22211 contact the step 101, and the lower longitudinal partition stack edge 22212 cooperates with the inner sidewall of the base partition cavity.

[0039] The aforementioned contact system is provided on the base 11. This contact system includes a stationary contact 4 and a moving contact 5. The stationary contact 4 is fixed to the base 11, and the moving contact 5 rotatably separates from or closes with the stationary contact 4. The stationary contact 4 includes a stationary contact guide rod 41. One end of the stationary contact guide rod 41 is configured as a stationary contact fixing end 411, and the other end is configured as a wiring terminal 412. A middle fixing end 413 extending towards the wiring terminal 412 is formed in the middle of the stationary contact fixing end 411. A stationary contact is fixed on the upper surface of the middle fixing end 413. 42, and also fixed with a pair of stationary contacts 43 mirror-distributed with stationary contact 42; the aforementioned moving contact 5 includes a central long guide rod 50, moving guide rods 51 disposed on both sides thereon, moving contact 52 fixed on the central long guide rod 50 and cooperating with stationary contact 42, moving contact 53 fixed on the moving guide rod 51 and cooperating with stationary contact 43, and an insulating protective cover 54 fixed on the central long guide rod 50 and corresponding to moving contact 53. The aforementioned central long guide rod 50 extends into the aforementioned opening groove 20, while the moving guide rod 51 extends out of the opening groove 20.

[0040] The aforementioned stationary contact 4 is provided with a stationary contact arc-blocking cover 6. The stationary contact arc-blocking cover 6 includes a front panel 61 for covering the front surface of the aforementioned stationary contact fixing end 411, a side panel 62 for covering the two sides of the stationary contact fixing end 411, a rear panel 63 for covering the rear surface of the stationary contact fixing end 411 facing the terminal 412, a top plate 64 connecting the front panel 61 and the rear panel 63, a pair of openings 65 respectively provided on both sides of the top plate 64, and a notch 66 opened in the middle of the rear panel 63. The aforementioned top plate 64 covers the upper surface of the stationary contact fixing end 411, and the pair of stationary contacts 43 are exposed through the openings 65. The middle fixing end 413 is accommodated in the notch 66, and a connecting rib 67 connected to the top plate 64 is provided at the top of the notch 66.

[0041] Installing a stationary contact arc-damping cover 6 on the stationary contact 4 can provide good protection for the stationary contact 4. Specifically, it can enhance the electrical isolation between the side of the stationary contact 4 and the middle long guide rod 50 of the moving contact 5, and improve the insulation reliability between the moving and stationary contacts 5 and 4 during the breaking process.

[0042] A closed wing plate 2212 extends from the aforementioned pair of front arc-blocking covers 221 respectively. The closed wing plate 2212 is located on both sides of the aforementioned moving contact 52 on the aforementioned middle long guide rod 50, and extends from the aforementioned arc-extinguishing device 2 to the aforementioned moving contact 5 and passes through the aforementioned moving contact 53. The inner walls of the two facing each other at the bottom of the aforementioned pair of closed wing plates 2212 are engaged with the two end faces of the top plate 64. The bottom edge of the aforementioned pair of closed wing plates 2212 is engaged with the upper surface of the aforementioned stationary contact fixing end 411. A groove 22121 is also provided at the bottom of the pair of closed wing plates 2212. The groove 22121 is engaged with the aforementioned connecting rib 67 at the top of the aforementioned notch 66.

[0043] The function of the aforementioned sealing wing plate 2212, which serves as a sealing part, is to form electrical isolation between the main contacts (moving contact 2 53 and stationary contact 2 43) and the arc contacts (moving contact 1 52 and stationary contact 1 42), preventing the arc from transferring to the main contacts during the breaking process. The sealing wing plate 2212 can be made of a gas-generating material to enhance the gas-generating performance during the arc-extinguishing process, increase the gas pressure, increase the arc voltage, and accelerate the arc extinguishing.

[0044] Please see Figures 10 to 11 And combined Figures 1 to 9 The aforementioned closed wing plate 2212 is formed by the side walls of the two facing each other of the aforementioned pair of front arc diaphragm covers 221 extending towards the aforementioned moving contact 5. The side walls of the aforementioned opening slot 20 are formed by the two facing each other of the pair of closed wing plates 2212 and the pair of front arc diaphragm covers 221. The projection of the moving contact 5, the moving contact point 52, on the pair of side walls 201 in the open position forms the first recessed side wall 2011. The projection of the aforementioned insulating protective cover 54 on the pair of side walls 201 forms the second recessed side wall 2012. The distance between the pair of second recessed side walls 2012 is greater than the distance between the pair of first recessed side walls 2011.

[0045] The projection of the moving contact 52 of the moving contact 5 in the open position onto a pair of side walls 201 forms a first recessed side wall 2011, which is used to increase the electrical insulation distance d1 between the moving contact 52 and the two sides of the arc extinguishing device; the projection of the insulating protective cover 54 onto a pair of side walls 201 forms a second recessed side wall 2012, which is used to increase the electrical insulation distance d2 between the insulating protective cover 54 and the two sides of the arc extinguishing device (ensuring it is above 2mm).

[0046] The bottom of the aforementioned pair of arc-isolating shields 221 and the rear arc-isolating shield skirt 2222 are in contact with the upper surface of the stationary contact guide rod 41, thereby enhancing the electrical isolation of the arc-extinguishing device 2 from the stationary contact guide rod 41 and preventing the arc from breaking down the stationary contact guide rod 41 during the breaking process.

[0047] The rear arc-isolating cover skirt 2222 at the bottom of the aforementioned rear arc-isolating cover 222 contacts the upper surface of the aforementioned stationary contact guide rod 41, covering the upper surface of the stationary contact.

[0048] As described above, after the cover 12 (which can also be called the "intermediate cover" because there is a top cover not shown in the figure on the top of the cover 12) and the base 11 are spliced and fixed up and down, the aforementioned cavity 10 is formed inside. The moving contact 5, the static contact 4 of the contact system and the arc extinguishing device 2 are installed inside the cavity 10. When the operating mechanism is installed above the main shaft ( Figure 5 shown but not given an attached drawing reference number) of the structural system of the contact system, the aforementioned top cover is sleeved above the cover 12 serving as the intermediate cover, so as to enclose components such as the contact system, the arc extinguishing device 2 and the operating mechanism inside the housing 1.

[0049] When the moving contact 52 and the static contact 52 extending into the arc extinguishing device 2 are separated, an arc will be generated. The cooperation between the aforementioned stop device 3 and the pair of inner side walls of the cavity 10 forms a blocking effect, which can prevent the high-temperature ionized gas in the arc extinguishing device 2 from diffusing to the periphery of the arc extinguishing device, so that the high-temperature ionized gas is concentrated and discharged through the air outlet 2223 formed in a dense state on the rear arc shield 222.

[0050] Of course, the form of the anti-flow stack edge is not limited to the overall shape of the Chinese character "kou" in the above-mentioned embodiment or the upper and lower longitudinal stack edges 22112 and 22212 are extended on the basis of the "kou" shape to form. It can also be a continuous convex structure formed on both sides of the arc shield 22 in the height direction of the arc extinguishing device. Specifically, on the outer wall of the arc shield on the opposite sides of the arc shield 22, there are convex ribs protruding from the outer wall of the arc shield and continuous in the height direction of the arc extinguishing device. The stop device 3 is formed by the convex ribs. The top of the convex rib is flush with the top surface of the arc shield 22, and the bottom of the convex rib is flush with the bottom surface of the arc shield 22. At this time, the convex rib can be a straight line vertical in the height direction of the arc extinguishing device, or an oblique line or a curve at an angle to this height direction, as long as it is continuous and can block the flow of the high-temperature ionized gas between the arc shield 22 and the cavity 10, that is, it can block the path of the high-temperature ionized gas on both sides outside the arc extinguishing device 2 ( Figure 9 , the front and back sides outside the arc extinguishing device). Of course, the anti-flow stack edge can also be formed by protruding on the inner wall of the cavity 10 facing the arc shield 22. The side of the anti-flow stack edge facing away from the inner wall of the cavity 10 cooperates with the wall of the arc shield 22 facing away from the grid 21.

[0051] To sum up, due to the blocking effect of the above-mentioned stop device 3, the high-temperature ionized gas in the arc extinguishing device 2 can be blocked from flowing between the two sides of the arc shield 22 and the inner wall of the cavity 10, so that the high-temperature ionized gas is concentrated and discharged through the air holes 2223, ensuring the reliability of the breaking process.

Claims

1. A switch comprising a housing (1) and an arc-extinguishing device (2), wherein the housing (1) has a cavity (10) for accommodating the arc-extinguishing device (2), and the arc-extinguishing device (2) comprises grid plates (21) stacked along the height direction and an arc-blocking cover (22) for accommodating the grid plates (21), characterized in that: A stop device (3) is provided between the arc shield (22) and the cavity (10) to prevent high-temperature ionized gas from flowing between the arc shield (22) and the cavity (10).

2. A switch according to claim 1, characterized in that: The stop device (3) is formed by an anti-flow stacking edge protruding from the wall of the arc-blocking cover (22) on the side opposite to the grid plate (21), and the side of the anti-flow stacking edge opposite to the wall of the arc-blocking cover (22) cooperates with the inner wall of the cavity (10); or, the stop device (3) is formed by an anti-flow stacking edge protruding from the inner wall of the cavity (10), and the side of the anti-flow stacking edge opposite to the inner wall of the cavity (10) cooperates with the wall of the arc-blocking cover (22) on the side opposite to the grid plate (21).

3. A switch according to claim 2, characterized in that: The arc-blocking shield (22) includes a pair of front arc-blocking shields (221) arranged facing each other and a rear arc-blocking shield (222) connected to the pair of front arc-blocking shields (221). The grid plate (21) includes an arc-cutting body (211) and a pair of grid plate legs (212). The pair of grid plate legs (212) extend from the end of the arc-cutting body (211) away from the rear arc-blocking shield (222) in a state that is both parallel to each other and spaced apart from each other. The pair of grid plate legs (212) and the arc-cutting body (211) together make the shape of the grid plate (21) U-shaped. The pair of front arc-blocking shields (221) respectively correspond to and enclose the pair of grid plate legs (212). The space between the sides of the pair of front arc-blocking shields (221) facing each other and away from the rear arc-blocking shield (222) is formed as an opening slot (20). On the opposite sides of the front arc diaphragm (2211), there are front arc diaphragm outer wall stack edges (22111) that protrude from the surface of the front arc diaphragm outer wall (2211). The rear arc diaphragm (222) corresponds to the arc cutting body (211) and encloses the arc cutting body (211). On the corresponding sides of the rear arc diaphragm (2221), there are rear arc diaphragm outer walls (2221). The stop device (3) is formed by the front and rear arc-blocking outer wall stack edges (22111) respectively, which are protruding from the surface of the rear arc-blocking outer wall (2221). The stop device (3) is formed by the front and rear arc-blocking outer wall stack edges (22111, 22211) joining together. A rear arc-blocking skirt edge (2222) is formed at the bottom of the rear arc-blocking (222).

4. A switch according to claim 3, characterized in that: The overall shape of the stop device (3) formed after the outer wall stack edge (22111) of the front partition arc cover and the outer wall stack edge (22211) of the rear partition arc cover are joined together is in the shape of the Chinese character 'kou' (square). And at the upper part of this square shape, an upper mediastinal stack edge (22112) extends upward with the outer wall (2211) of the front partition arc cover as the carrier. While at the lower part of this square shape, a lower mediastinal stack edge (22212) extends downward with the outer wall (2221) of the rear partition arc cover as the carrier; the top surface of the upper mediastinal stack edge (22112) is flush with the top surface of the pair of front partition arc covers (221), and the bottom of the lower mediastinal stack edge (22212) is joined to the rear partition arc cover skirt (2222) formed at the bottom of the rear partition arc cover (222).

5. A switch according to claim 4, characterized in that: The described housing (1) includes a base (11) and a cover (12). On the base (11) and at positions corresponding to between each two adjacent arc extinguishing devices (2), a base partition wall (111) is formed. And on the cover (12) and at positions corresponding to the base partition wall (111), cover partition walls (121) are arranged at intervals. The cavity (10) is jointly formed by the cover partition wall cavity and the base partition wall cavity. When the cover (12) and the base (11) are fitted together, the cover partition wall (121) and the base partition wall (111) are spliced. The interval distance between adjacent base partition walls (111) is less than the interval distance between adjacent cover partition walls (121), so that a step (101) is formed at the joint of the inner wall of the cavity (10). The upper mediastinal stack edge (22112), the outer wall stack edge (22111) of the front partition arc cover, and the outer wall stack edge (22211) of the rear partition arc cover cooperate with the inner side wall of the cover partition wall cavity, and the bottom of the outer wall stack edge (22111) of the front partition arc cover and the bottom of the outer wall stack edge (22211) of the rear partition arc cover contact the step (101), and the lower mediastinal stack edge (22212) cooperates with the inner side wall of the base partition wall cavity.

6. A switch according to claim 5, characterized in that: A contact system is provided on the base (11). The contact system includes a stationary contact (4) and a moving contact (5). The stationary contact (4) is fixed on the base (11), and the moving contact (5) rotates to separate from or close to the stationary contact (4). The stationary contact (4) includes a stationary contact guide rod (41). One end of the stationary contact guide rod (41) is configured as a stationary contact fixing end (411), and the other end is configured as a wiring terminal (412). An intermediate fixing end (413) is configured in the middle of the stationary contact fixing end (411) and extends in the direction of the wiring terminal (412). A stationary contact one (42) is fixed on the upper surface of the intermediate fixing end (413), and a pair of stationary contacts are also fixed in a mirror image of the stationary contact one (42). Point 2 (43); The moving contact (5) includes a middle long guide rod (50), moving guide rods (51) on both sides thereon, a moving contact one (52) fixed on the middle long guide rod (50) and cooperating with the stationary contact one (42), a moving contact two (53) fixed on the moving guide rod (51) and cooperating with the stationary contact two (43), and an insulating protective cover (54) fixed on the middle long guide rod (50) and corresponding to the moving contact two (53). The middle long guide rod (50) extends into the opening groove (20), while the moving guide rod (51) extends out of the opening groove (20). The rear arc-isolating cover skirt (2222) at the bottom of the rear arc-isolating cover (222) contacts the upper surface of the stationary contact guide rod (41).

7. A switch according to claim 6, characterized in that: The stationary contact (4) is provided with a stationary contact arc-blocking cover (6). The stationary contact arc-blocking cover (6) includes a front panel (61) for covering the front surface of the stationary contact fixing end (411), a side panel (62) for covering the two sides of the stationary contact fixing end (411), a rear panel (63) for covering the rear surface of the stationary contact fixing end (411) facing the terminal (412), a top plate (64) connecting the front panel (61) and the rear panel (63), a pair of openings (65) respectively provided on both sides of the top plate (64) and a notch (66) opened in the middle of the rear panel (63). The top plate (64) covers the upper surface of the stationary contact fixing end (411), and a pair of stationary contacts (43) are exposed through the openings (65). The middle fixing end (413) is accommodated in the notch (66). A connecting rib (67) connected to the top plate (64) is provided at the top of the notch (66).

8. A switch according to claim 7, characterized in that: A closed wing plate (2212) extends from each of the pair of front arc-blocking covers (221). The closed wing plate (2212) is located on both sides of the moving contact one (52) on the middle long guide rod (50), and extends from the arc-extinguishing device (2) to the moving contact (5) and passes through the moving contact two (53). The inner walls of the two facing each other at the bottom of the pair of closed wing plates (2212) are engaged with the two end faces of the top plate (64). The bottom edge of the pair of closed wing plates (2212) is engaged with the upper surface of the stationary contact fixed end (411). A groove (22121) is also provided at the bottom of each pair of closed wing plates (2212). The groove (22121) is engaged with the connecting rib (67) at the top of the notch (66).

9. A switch according to claim 8, characterized in that: The closed wing plate (2212) is formed by the side walls of the two facing each other of the pair of front arc diaphragms (221) extending toward the moving contact (5). The side walls (201) of the opening slot (20) are formed by the side walls of the pair of closed wing plates (2212) and the pair of front arc diaphragms (221). The moving contact (5) in the open position has a first recessed side wall (2011) formed by the projection of the moving contact point 1 (52) on the pair of side walls (201). The projection of the insulating protective cover (54) on the pair of side walls (201) forms a second recessed side wall (2012). The distance between the pair of second recessed side walls (2012) is greater than the distance between the pair of first recessed side walls (2011).

10. A switch according to claim 9, characterized in that: On the outer wall of the arc-blocking cover (22) on the opposite side, there are raised ribs that protrude from the outer wall of the arc-blocking cover and are continuous in the height direction of the arc-extinguishing device. The stop device (3) is formed by the raised ribs. The top of the raised ribs is flush with the top surface of the arc-blocking cover (22), and the bottom of the raised ribs is flush with the bottom surface of the arc-blocking cover (22).

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