An arc-extinguishing chamber for a switch

Abstract

An arc-extinguishing chamber for a switch belongs to the field of low-voltage electrical technology. The arc-extinguishing chamber has an outlet and includes a pair of side plates. Multiple grid plates are arranged in an array between the side plates. An air passage is formed on the outlet side of the grid plates. A separator is provided within the air passage, corresponding to the inner region of the outlet, dividing the air passage into a first air passage and a second air passage with opposing airflow. Advantages: The separator prevents the airflow in the first and second air passages from interfering with each other, ensuring smooth airflow discharge, facilitating rapid arc entry into the grid plates, and improving the arc-extinguishing effect.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical appliance technology, specifically relating to an arc-extinguishing chamber for a switch. Background Technology

[0002] Switches are crucial electrical appliances in power supply and distribution lines. They interrupt current flow to break the circuit, protecting lines and equipment. A switch typically includes a contact system, which consists of moving and stationary contacts. When the moving contact actuates, it contacts or separates from the stationary contact, thus enabling the switch to conduct or disconnect. As is known in the industry, when a switch breaks, an electric arc is generated between the moving and stationary contacts. This arc has relatively large energy, posing a significant challenge to the switch's breaking action. The circuit can only be broken when the arc is extinguished. Therefore, switches usually contain an arc-extinguishing chamber. Under the combined action of magnetic and air force, the arc enters the arc-extinguishing chamber and is cut into multiple short arcs connected in series by grid plates, thereby increasing the arc voltage and extinguishing the arc. The role of the arc-extinguishing chamber in ensuring the safe operation of electrical equipment is undeniable.

[0003] To ensure the arc can smoothly enter the grid assembly within the arc-extinguishing chamber, the chamber typically has an insulating plate (or insulating support) with vent holes on the outlet side of the grid. Arc gas passes through the insulating plate and enters the gas passage, then exits to the outside of the switch. With an increasing number of grids, the inconsistent outlet velocities at different locations within the arc-extinguishing chamber cause airflow in areas with faster outlet velocities to impact airflow in areas with slower outlet velocities. This hinders the smooth flow of airflow in the slower outlet velocities, making it difficult for the arc to enter the corresponding grids and thus affecting arc extinguishing. This has been a persistent problem for those skilled in the art. Therefore, the applicant has developed a beneficial design, and the technical solution described below arises from this context. Utility Model Content

[0004] The purpose of this invention is to provide an arc-extinguishing chamber for a switch, which, by setting a separator, divides the air passage into at least a first air passage and a second air passage with airflows moving in opposite directions. This ensures that the airflows in areas with different airflow velocities within the air passages do not interfere with each other, thus guaranteeing the smooth discharge of airflow from the grid plate and facilitating the rapid entry of the electric arc into the grid plate.

[0005] The purpose of this utility model is achieved as follows: an arc-extinguishing chamber for a switch, the arc-extinguishing chamber having an air outlet, the arc-extinguishing chamber including a pair of side plates, a plurality of grid plates arranged in an array between the pair of side plates, an air passage formed on the air outlet side of the grid plates, and at least one partition member provided in the air passage and in the inner region corresponding to the air outlet, the partition member dividing the air passage into at least a first air passage and a second air passage with airflows moving in opposite directions.

[0006] In one specific embodiment of this utility model, the switch further includes a housing, the arc-extinguishing chamber is located inside the housing, and the air outlet is located on the housing.

[0007] In another specific embodiment of this utility model, a perforated plate is provided on the exhaust port side of the array of grid plates, and the air passage is located on the side of the perforated plate away from the grid plates.

[0008] In another specific embodiment of this utility model, the partition is disposed on the perforated plate, or disposed on the inner side of the housing, or the partition is composed of a part disposed on the perforated plate and another part disposed on the inner side of the housing.

[0009] In another specific embodiment of the present invention, the switch further includes a contact system, and the grid includes a first grid group and a second grid group. The first grid group is disposed away from the contact system, while the second grid group is disposed corresponding to the moving contact of the contact system. The first grid group and the second grid group form an L-shaped structure.

[0010] In another specific embodiment of this utility model, the perforated plate includes a first perforated plate and a second perforated plate. The first perforated plate is correspondingly disposed with respect to the first grid plate group, and the second perforated plate is correspondingly disposed with respect to the second grid plate group. The separator is located on the upper part of the first perforated plate, the first air passage is located below the separator and on the side of the first perforated plate away from the grid plate, and the second air passage is located above the separator and on both the side of the second perforated plate away from the grid plate and the side of the first perforated plate away from the grid plate.

[0011] In a further specific embodiment of this utility model, the separator is located at the junction of the first perforated plate and the second perforated plate, the housing has a corner corresponding to the junction, the air outlet is located at the corner of the housing, the first air passage is provided corresponding to the first perforated plate, and the second air passage is provided corresponding to the second perforated plate.

[0012] In a further specific embodiment of this utility model, a spacer is also included, which is located between the perforated plate and the inner wall of the housing, and the spacer is set at an angle to the partition.

[0013] In yet another specific embodiment of this utility model, the air passage is formed by the perforated plate and the inner wall of the housing, and a plurality of ribs are provided between the perforated plate and the housing to form the air passage wall.

[0014] In yet another specific embodiment of this utility model, the air outlet includes a first air outlet and a second air outlet, wherein the first air outlet is used for air outlet of the first air passage, and the second air outlet is used for air outlet of the second air passage.

[0015] In another specific embodiment of this utility model, the grid plate further includes a third grid plate group, which is arranged corresponding to the stationary contact of the contact system. One end of the first grid plate group is engaged with one end of the second grid plate group, and the other end of the first grid plate group is engaged with one end of the third grid plate group, so that the grid plate forms a C-shape. The air passage further includes a third air passage, which is located on at least one outer side of a pair of side plates of the arc-extinguishing chamber. The third air passage is used to connect the gas discharged from the third grid plate group to the air outlet.

[0016] In another specific embodiment of this utility model, the third air passage is a pair, respectively located on the two outer sides of the pair of side plates.

[0017] This invention, by setting a separator, divides the air passage into at least a first air passage and a second air passage with airflows moving in opposite directions. This ensures that the airflows in areas with different airflow velocities within the air passages do not interfere with each other, thus guaranteeing the smooth discharge of airflow from the grid plate and facilitating the rapid entry of the electric arc into the grid plate. Attached Figure Description

[0018] Figure 1 This is a side sectional view of the switch described in the first embodiment of this utility model; Figure 2 This is a schematic diagram of the overall structure of the arc-extinguishing chamber described in the first embodiment of this utility model; Figure 3 This is an explosion diagram of the arc-extinguishing chamber described in the first embodiment of this utility model; Figure 4 This is a partial structural diagram of the switch described in the first embodiment of the present invention; Figure 5 This is a side sectional view of the arc-extinguishing chamber installed inside the housing in the first embodiment of this utility model; Figure 6 This is a top sectional view of the arc-extinguishing chamber installed inside the housing in the first embodiment of this utility model; Figure 7 This is a schematic diagram of the overall structure of the arc-extinguishing chamber described in the second embodiment of this utility model; Figure 8 This is a schematic diagram of the overall structure of the arc-extinguishing chamber in the third embodiment of the present invention; Figure 9This is a side sectional view of the arc-extinguishing chamber installed inside the housing according to the third embodiment of this utility model.

[0019] In the diagram: 1. Arc-extinguishing chamber; 11. Grid plate; 111. First grid plate group; 112. Second grid plate group; 113. Third grid plate group; 114. Connecting element; 12. Side plate; 121. Baffle plate; 122. Vent hole; 13. Orifice plate; 131. First orifice plate; 132. Second orifice plate; 14. Moving arc-starting plate; 2. Contact system; 21. Moving contact; 22. Stationary contact; 221. Stationary arc-starting plate; 3. Housing. 31. First half shell; 32. Second half shell; 10. First shell; 20. Second shell; 30. Third shell; 40. Fourth shell; 100. Separator; 200. Isolation piece; 300. Protruding rib; 400. Air passage; 401. First air passage; 402. Second air passage; 403. Third air passage; 1000. Air outlet; 1001. First air outlet; 1002. Second air outlet. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0021] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0022] Example 1: As Figure 1 and Figure 2 As shown, the switch includes an arc-extinguishing chamber 1, a contact system 2, and a housing 3. The arc-extinguishing chamber 1 and the contact system 2 are both located inside the housing 3, and the arc-extinguishing chamber 1 is located on the side of the contact system 2 in the opening direction. Thus, when the contact system 2 is opened and an electric arc is generated, the electric arc will enter the arc-extinguishing chamber 1 and be extinguished in the arc-extinguishing chamber 1.

[0023] See Figure 1 The housing 3 includes a first half-shell 31 and a second half-shell 32, which are joined together to form a contact arc-extinguishing cavity. This cavity accommodates the contact system 2 and the arc-extinguishing chamber 1. In this embodiment, the first half-shell 31 is located below, while the second half-shell 32 is located above the first half-shell 31.

[0024] The contact system 2 includes a moving contact 21 and a stationary contact 22. The stationary contact 22 is fixedly disposed, while the moving contact 21 is rotatably disposed. After the moving contact 21 rotates, it contacts or separates from the stationary contact 22, thereby realizing the closing or opening of the contact system 2.

[0025] See you later Figure 1 In the figure, the first direction is the line connecting the open positions of the moving contact 21 and the stationary contact 22, and the second direction is the overall line connecting the contact system 2 and the arc-extinguishing chamber 1. The second direction is perpendicular to the first direction. The arc-extinguishing chamber 1 includes multiple grid plates 11, which further include a first grid plate group 111, a second grid plate group 112, and a third grid plate group 113. One end of the first grid plate group 111 engages with one end of the second grid plate group 112, and the other end of the first grid plate group 111 engages with one end of the third grid plate group 113, thereby forming a C-shape. Specifically, in the second direction, the first grid plate group 111 is arranged along the first direction on the side away from the contact system 2, and the second grid plate group 112, corresponding to the moving contact 21, is located above the first grid plate group 111 in the first direction and arranged along the second direction. The first grid plate group 111 and the second grid plate group 112 form an L-shaped structure. The third grid group 113 corresponds to the stationary contact 22, located below the first grid group 111 in the first direction and arrayed along the second direction. More specifically, the grids 11 of the second grid group 112 are inclined toward the contact system 2, and similarly, the grids 11 of the third grid group 113 are also inclined toward the contact system 2.

[0026] Still see Figure 1 The arc-extinguishing chamber 1 further includes side plates 12, perforated plates 13, and moving arc-inducing plates 14. The side plates 12 are a pair, spaced apart from each other. The grid plates 11 and the moving arc-inducing plates 14 are located between the pair of side plates 12, while the perforated plate 13 is located on the exhaust port side of the grid plates 11. The moving arc-inducing plate 14 is used to cooperate with the moving contact 21; similarly, a stationary arc-inducing plate 221 is also installed on the stationary contact 22. More specifically, the moving arc-inducing plate 14 also cooperates with the end of the second grid plate group 112 near the moving contact 21, while the stationary arc-inducing plate 221 cooperates with the side of the third grid plate group 113 near the stationary contact 22.

[0027] like Figure 3As shown, the arc-extinguishing chamber 1 includes a first housing 10, a second housing 20, a third housing 30, and a fourth housing 40. The first housing 10, second housing 20, third housing 30, and fourth housing 40 are joined together to form the arc-extinguishing chamber shell of the arc-extinguishing chamber 1. The arc-extinguishing chamber shell is the external insulating layer of the arc-extinguishing chamber 1, and the grid plate 11 and the moving arc-inducing plate 14 are both installed inside the arc-extinguishing chamber shell. The above distinction is only a distinction in the number of components. The side plate 12 is composed of a portion of the aforementioned arc-extinguishing chamber shell, while the perforated plate 13 can be composed of a portion of the arc-extinguishing chamber shell or can be composed independently.

[0028] Specifically, the first housing 10 is a pair, located on both sides of the arc-extinguishing chamber 1 along a third direction as shown in the figure. The third direction is the width direction of the arc-extinguishing chamber 1, which can also be referred to as the width direction of the grid plate 11. The third direction is perpendicular to the first direction and the second direction. The second housing 20 is also a pair, and the pair of second housing 20 can be integrally formed. The second housing 20 is installed in conjunction with the first housing 10; the first housing 10 is located on the air inlet side of the arc-extinguishing chamber 1 relative to the second housing 20, while the second housing 20 is located on the air outlet side of the arc-extinguishing chamber 1 relative to the first housing 10. The third housing 30 is used to be installed in conjunction with the second grid plate group 112, and the fourth housing 40 is used to be installed in conjunction with the third grid plate group 113. Specifically, in the first direction, the third housing 30 is located above and on the side corresponding to the moving contact 21, while the fourth housing 40 is located below and on the side corresponding to the stationary contact 22.

[0029] Furthermore, a pair of baffles 121 are provided on the side of the first housing 10 facing the contact system 2. The baffles 121 are located on both sides of the moving contact piece of the moving contact 21 and cooperate with the rotating shaft on which the moving contact 21 is mounted.

[0030] See you later Figure 3 The first grid plate group 111 and the second grid plate group 112 are electrically connected by a series connector 114. Specifically, the series connector 114 is made of a metal plate bent into a "<" shape; or, the series connector 114 is made of a metal block processed into a triangle. The two outer surfaces of the series connector 114 are respectively spaced apart from the closest end grid plate in the first grid plate group 111 and the closest end grid plate in the second grid plate group 112.

[0031] See Figure 4The arc-extinguishing chamber 1 has an outlet 1000, preferably located on the housing 3. In this embodiment, the outlet 1000 is located on the side wall of the housing 3 corresponding to the arc-extinguishing chamber 1 in the second direction. The outlet 1000 penetrates the outer side of the housing 3 and the contact arc-extinguishing cavity inside the housing 3, and the gas in the arc-extinguishing chamber 1 is discharged outward through the outlet 1000. Specifically, the outlet 1000 is located on the second half-shell 32, and more specifically, the outlet 1000 is provided corresponding to the first grid plate group 111 and the second grid plate group 112. In this embodiment, the switch is a three-pole housing. Preferably, the outlet 1000 is located on the two switch poles; the contact system 2 is also located on the two switch poles. The wiring portion of the stationary contact 22 is provided below the outlet 1000.

[0032] like Figure 5 An air passage 400 is provided on the side of the perforated plate 13 away from the grid plate 11, and the air passage 400 communicates with the air outlet 1000. A partition 100 is provided within the air passage 400, dividing it into a first air passage 401 and a second air passage 402. Since the partition 100 corresponds to the inner region of the air outlet 1000, both the first air passage 401 and the second air passage 402 communicate with the air outlet 1000. Alternatively, the perforated plate 13 can be omitted, and the air passage 400 can be formed directly on the air outlet side of the grid plate 11.

[0033] The gas within the gaps in the grid 11 passes through the perforated plate 13 and enters the first air passage 401 and the second air passage 402. The airflow in the first air passage 401 and the second air passage 402 travels in opposite directions and is then discharged outward from the outlet 1000. Due to the partition 100, the airflow in the first air passage 401 and the second air passage 402 does not interfere with each other, thus ensuring smooth airflow discharge, facilitating rapid arc entry into the grid 11, and improving the arc extinguishing effect.

[0034] Furthermore, the effect of the partition 100 is not related to the arrangement shape of the grid plates 11. For example, when the grid plates 11 consist of only a strip-shaped grid plate group, the air outlet 1000 is located between the two ends of the air passage 400. The partition 100 cooperates with the air outlet 1000 to generate the first air passage 401 and the second air passage 402. Also, due to the presence of the partition 100, the airflow in the two passages will not affect each other, ensuring the smoothness of airflow discharge and facilitating the entry of the electric arc into the grid plates 11.

[0035] The perforated plate 13 includes a first perforated plate 131 and a second perforated plate 132. The first perforated plate 131 corresponds to the first grid plate group 111, and the second perforated plate 132 corresponds to the second grid plate group 112. That is, the first perforated plate 131 is located on the exhaust port side of the first grid plate group 111, and the second perforated plate 132 is located on the exhaust port side of the second grid plate group 112.

[0036] The separator 100 is located on one side of the first perforated plate 131. Specifically, the separator 100 is located on the upper part of the first perforated plate 131, and the first air passage 401 includes an air passage located on the side of the first perforated plate 131 away from the grid plate 11 and below the separator 100; while the second air passage 402 includes an air passage located on the side of the second perforated plate 132 away from the grid plate 11 and an air passage located on the side of the first perforated plate 131 away from the grid plate 11 and above the separator 100.

[0037] Furthermore, the air passage 400 is formed by the perforated plate 13 and the inner wall of the housing 3, and multiple ribs are provided between the perforated plate 13 and the housing 3 to form the air passage wall of the air passage 400. Specifically, the air passage wall is located between the side plate 12 and the inner wall of the housing 3. The separator 100 can be disposed on the perforated plate 13 or on the inner side of the housing 3; the separator 100 can also be partially disposed on the perforated plate 13 and partially disposed on the inner side of the housing 3, with the two parts joined together to form a complete separator 100. Preferably, the separator 100 is strip-shaped.

[0038] See you later Figure 2 , Figure 3 and Figure 6The air passage 400 further includes a third air passage 403, which is located within the contact arc-extinguishing chamber and corresponds to and cooperates with the third grid plate group 113 for air outlet of the third grid plate group 113. The third air passage 403 is located on at least one outer side of a pair of side plates 12 of the arc-extinguishing chamber 1. The air outlet end of the grid plate 11 refers to the end away from the arc inlet in the extending direction of the grid plate 11, thereby facilitating the full entry of the arc into the grid plate 11. Preferably, there is a pair of third air passages 403, respectively located on the two outer sides of a pair of side plates 12, and passing through both sides of the third grid plate group 113 through air holes 122. Specifically, the air holes are located on the side plates 12, and more specifically, the air holes 122 are located on both sides of the fourth housing 40. The air holes 122 correspond to both sides of the air outlet end of the third grid plate group 113, thereby facilitating the entry of the arc into the third grid plate group 113. The air hole 122 may not be formed on the side plate 12, but located on the outside of the side plate 12. This can usually be achieved by shortening the side plate 12, thereby forming the air hole 122 on the outside of the side plate 12 near the grid plate 11; or it can be achieved by leaving an air passage for communicating with the third air passage 403 on the top outside of the grid plate 11. In this case, the side plate 12 is modified accordingly to realize the air passage.

[0039] In this embodiment, the third air passage 403 is formed by the side plate 12 and the inner wall of the housing 3, with multiple protruding ribs between them, forming the air passage wall between the side plate 12 and the inner wall of the housing 3. The third air passage 403 is also connected to the air outlet 1000, meaning that the third air passage 403 connects the gas discharged from the third grid plate group 113 to the air outlet 1000. The third air passage 403 can solve the gas discharge problem of the third grid plate group 113. Furthermore, since the third air passage 403 is separately configured, it can fully ensure the smooth gas discharge of the third grid plate group 113, ensuring that the electric arc can enter the third grid plate group 113.

[0040] Example 2: As Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that it also includes a spacer 200, which is also located between the perforated plate 13 and the inner wall of the housing 3, and is angled to the partition 100. Preferably, the partition 100 extends along a third direction; the spacer 200 extends along a first direction and intersects with the partition 100. Due to the presence of the spacer 200, the first air passage 401 is divided into multiple air passages, thereby effectively preventing frontal penetration.

[0041] In this embodiment, the isolator 200 is located only within the first airway 401, dividing the first airway 401 into at least two sub-airways. Similarly, the isolator 200 may also be located within the second airway 402 or the third airway 403, dividing the second airway 402 or the third airway 403 into at least two sub-airways.

[0042] See you later Figure 7 A raised rib 300 is also provided on the outer side of the side plate 12. On the one hand, the raised rib 300 is used for the installation of the arc-extinguishing chamber 1, and it cooperates with the inner side of the housing 3 to ensure the installation and positioning of the arc-extinguishing chamber 1 in the contact arc-extinguishing cavity; on the other hand, the raised rib 300 can also be used as a raised rib, that is, it is used to cooperate with the inner side of the housing 3 and the side plate 12 to form the air passage 400.

[0043] Example 3: As Figure 8 and Figure 9 As shown, the difference between this embodiment and Embodiment 1 is that the separator 100 is located at the junction of the first perforated plate 131 and the second perforated plate 132, and this junction corresponds to the corner of the housing 3. In this embodiment, the first air passage 401 also corresponds to the first perforated plate 131, while the second air passage 402 corresponds to the second perforated plate 132. The air outlet 1000 is located at the corner of the housing 3. Specifically, the air outlet 1000 includes a first air outlet 1001 and a second air outlet 1002, wherein the first air outlet 1001 is located on the housing 3 to the right of the arc-extinguishing chamber 1 in the second direction, and is used for the air outlet of the first air passage 401. Preferably, the first air outlet 1001 is also used for the air outlet of the third air passage 403; the second air outlet 1002 is located on the upper housing 3 in the first direction, and is used for the air outlet of the second air passage 402.

[0044] In the above embodiments, the air outlet 1000 is a single air outlet. However, the air outlet 1000 may be divided into two or more adjacent air outlets, which is also a variation that can be conceived by those skilled in the art and falls within the protection scope of this invention.

[0045] In the above embodiments, each of the partitions 100 is a single one. However, for the purposes of this invention, if two or more partitions 100 are provided in the air passage 400 and in the inner region corresponding to the air outlet 1000, with the partitions 100 spaced apart from each other, then at least on the outer side of the partitions 100 at both ends, two air passages 401 and 402 with airflows moving in opposite directions are formed, which also falls within the protection scope of this invention.

Claims

1. An arc-extinguishing chamber for a switch, the arc-extinguishing chamber (1) having an air outlet (1000), the arc-extinguishing chamber (1) comprising a pair of side plates (12), a plurality of grid plates (11) arranged in an array between the pair of side plates (12), and an air passage (400) formed on the air outlet side of the grid plates (11), characterized in that: At least one partition (100) is provided in the airway (400) and in the inner region corresponding to the air outlet (1000), the partition (100) dividing the airway (400) into at least a first airway (401) and a second airway (402) with airflows moving in opposite directions.

2. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The switch also includes a housing (3), the arc-extinguishing chamber (1) is located inside the housing (3), and the air outlet (1000) is located on the housing (3).

3. The arc-extinguishing chamber of a switch according to claim 2, characterized in that: A perforated plate (13) is provided on the exhaust port side of the array of grid plates (11), and the air passage (400) is located on the side of the perforated plate (13) away from the grid plates (11).

4. The arc-extinguishing chamber of a switch according to claim 3, characterized in that: The partition (100) is disposed on the perforated plate (13) or on the inner side of the housing (3), or the partition (100) is composed of a part disposed on the perforated plate (13) and another part disposed on the inner side of the housing (3).

5. The arc-extinguishing chamber of a switch according to claim 3, characterized in that: The switch also includes a contact system (2), and the grid (11) includes a first grid group (111) and a second grid group (112). The first grid group (111) is disposed away from the contact system (2), while the second grid group (112) is disposed corresponding to the moving contact (21) of the contact system (2). The first grid group (111) and the second grid group (112) form an L-shaped structure.

6. The arc-extinguishing chamber of a switch according to claim 5, characterized in that: The perforated plate (13) includes a first perforated plate (131) and a second perforated plate (132). The first perforated plate (131) is correspondingly disposed with respect to the first grid plate group (111), and the second perforated plate (132) is correspondingly disposed with respect to the second grid plate group (112). The separator (100) is located on the upper part of the first perforated plate (131). The first air passage (401) is located below the separator (100) and on the side of the first perforated plate (131) away from the grid plate (11). The second air passage (402) is located above the separator (100) and on the side of the second perforated plate (132) away from the grid plate (11) and the side of the first perforated plate (131) away from the grid plate (11).

7. The arc-extinguishing chamber of a switch according to claim 6, characterized in that: The separator (100) is located at the junction of the first perforated plate (131) and the second perforated plate (132). The housing (3) has a corner corresponding to the junction. The air outlet (1000) is located at the corner of the housing (3). The first air passage (401) is provided corresponding to the first perforated plate (131), and the second air passage (402) is provided corresponding to the second perforated plate (132).

8. The arc-extinguishing chamber of a switch according to claim 3, characterized in that: It also includes a spacer (200) located between the perforated plate (13) and the inner wall of the housing (3), and the spacer (200) is angled to the partition (100).

9. The arc-extinguishing chamber of a switch according to claim 3, characterized in that: The air passage (400) is formed by the perforated plate (13) and the inner wall of the housing (3). A plurality of ribs are provided between the perforated plate (13) and the housing (3) to form the air passage wall of the air passage (400).

10. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The air outlet (1000) includes a first air outlet (1001) and a second air outlet (1002). The first air outlet (1001) is used for air outlet of the first air passage (401), and the second air outlet (1002) is used for air outlet of the second air passage (402).

11. The arc-extinguishing chamber of a switch according to claim 5, characterized in that: The grid plate (11) further includes a third grid plate group (113), which is configured to correspond to the stationary contact (22) of the contact system (2). One end of the first grid plate group (111) is engaged with one end of the second grid plate group (112), and the other end of the first grid plate group (111) is engaged with one end of the third grid plate group (113), so that the grid plate (11) forms a C-shape. The air passage (400) further includes a third air passage (403), which is located on at least one outer side of a pair of side plates (12) of the arc-extinguishing chamber (1). The third air passage (403) is used to connect the gas discharged from the third grid plate group (113) to the air outlet (1000).

12. The arc-extinguishing chamber of a switch according to claim 11, characterized in that: The third airway (403) is a pair, located on the two outer sides of the pair of side plates (12).

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