Arc extinguish chamber of switch and switch comprising arc extinguish chamber

Abstract

The utility model discloses an arc extinguish chamber of a switch and the switch comprising the arc extinguish chamber, and belongs to the technical field of low-voltage electric appliances. The switch comprises an arc extinguish chamber and a contact system, the arc extinguish chamber is located on one side of the opening direction of the contact system, the arc extinguish chamber comprises a pair of side plates and a plurality of grid pieces arranged between the pair of side plates, and a pore plate is arranged on one side of an air outlet of each grid piece. One first vent hole column corresponds to one gap between the adjacent grid pieces, each first vent hole column comprises a round hole and a strip-shaped hole, and the strip-shaped holes in the two adjacent first vent hole columns are located at the two ends of the grid pieces in the width direction respectively. The advantages are that the ventilation efficiency is improved, and the arc can enter the grid sheet corresponding to one side of the moving contact.

Description

Technical Field

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

[0002] Switches are crucial electrical appliances in power supply and distribution lines. They interrupt the current carrying the circuit, protecting the lines and electrical 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. Due to the relatively large energy of the arc, breaking the switch becomes extremely difficult. Therefore, switches usually include an arc-extinguishing chamber to extinguish the arc generated when the moving and stationary contacts separate. The circuit is only broken when the arc is extinguished. The role of the arc-extinguishing chamber in ensuring the safe operation of electrical equipment is undeniable.

[0003] The arc-extinguishing chamber comprises an array of multiple grid plates, with adjacent grid plates spaced apart to form gaps for ventilation. A perforated plate with ventilation holes is provided on one side of the vent end of the array of grid plates. Typically, for interrupting various currents, especially currents less than or equal to the rated current level, it is difficult for the electric arc to enter the stacked grid plates due to the lack of lateral airflow. This has been a technical problem that has long plagued those skilled in the art. Utility Model Content

[0004] The primary objective of this invention is to provide an arc-extinguishing chamber for a switch. The perforated plate of the arc-extinguishing chamber has round holes and strip holes on the air hole row on the side corresponding to the moving contact. The strip holes in the two adjacent first air hole rows are located at both ends of the grid width direction, thereby improving the ventilation efficiency at that point and forming a transverse airflow. This can push the electric arc in the gap between adjacent grid plates to both sides, facilitating the entry of the electric arc into the stacked grid plates.

[0005] Another objective of this invention is to provide a switch including the arc-extinguishing chamber, which can ensure the full realization of the technical effects of the arc-extinguishing chamber.

[0006] To accomplish the primary task, the technical solution provided by this utility model is: an arc-extinguishing chamber for a switch, the switch including an arc-extinguishing chamber and a contact system, the arc-extinguishing chamber being located on one side of the contact system in the opening direction, the arc-extinguishing chamber including a pair of side plates and multiple grid plates disposed between the pair of side plates, a perforated plate being provided on one side of the air outlet of the multiple grid plates, the perforated plate forming at least one first vent hole row on the side corresponding to the moving contact of the contact system, one first vent hole row corresponding to a gap between adjacent grid plates, the first vent hole row including circular holes and strip holes, the strip holes in two adjacent first vent hole rows being located at both ends of the width direction of the grid plates respectively.

[0007] In a specific embodiment of this utility model, the perforated plate has a plurality of second vent rows on the side corresponding to the stationary contact, each of the second vent rows corresponding to a gap between adjacent grid plates, and the second vent rows only include circular holes.

[0008] In another specific embodiment of this utility model, the grid plate includes a notch and grid plate legs. The notch is located between a pair of grid plate legs and the notches are staggered. The offset direction of the strip holes in the first vent hole row is consistent with the offset direction of the notch on the grid plate near the moving contact side corresponding to the first vent hole row.

[0009] In another specific embodiment of this utility model, the length of the strip hole is greater than the distribution length of the three circular holes in the width direction of the grid sheet.

[0010] In a further specific embodiment of this utility model, there are multiple first vent arrays, and the number of first vent arrays is greater than the number of second vent arrays.

[0011] In a further specific embodiment of this utility model, a movable arc-inducing plate is provided on the side of the array of grid plates corresponding to the movable contact. The upper end of the movable arc-inducing plate is located outside the array of grid plates along the direction of the grid plate array, and its lower end extends into the arc-extinguishing chamber. The movable arc-inducing plate is located on the periphery of the array of grid plates. In the height direction of the arc-extinguishing chamber, the projection of the lower end of the movable arc-inducing plate near the movable contact on the perforated plate is located within the distribution area of ​​the first vent hole row.

[0012] In yet another specific embodiment of this utility model, a first vent array has a strip-shaped hole and a plurality of circular holes.

[0013] In yet another specific embodiment of this utility model, the number of the first vent array is twice the number of the second vent array.

[0014] In a further specific embodiment of this utility model, in the width direction of the grid plate, the length of the strip hole is less than half the length of the first vent hole row.

[0015] To accomplish another task, the technical solution provided by this utility model is: a switch, including a contact system, a housing, and the arc-extinguishing chamber mentioned above; the housing includes a base and a bottom plate, which are spliced ​​together to form the housing; the contact system includes a moving contact and a stationary contact, the moving contact being mounted on the base, and the stationary contact being mounted on the bottom plate.

[0016] Due to the above-mentioned structure, this utility model has the following beneficial effects: the perforated plate of the arc-extinguishing chamber has round holes and strip holes on the air hole row on the side corresponding to the moving contact, and the strip holes in the two adjacent first air hole rows are respectively located at both ends of the grid width direction, thereby improving the ventilation efficiency at that point, forming a transverse airflow, and pushing the electric arc in the gap between adjacent grid plates to both sides, which is conducive to the electric arc entering the stacked grid plates. Attached Figure Description

[0017] Figure 1 This is an exploded view of the switch described in this utility model;

[0018] Figure 2 This is an exploded view of the arc-extinguishing chamber described in this utility model;

[0019] Figure 3 This is a schematic diagram showing the lateral fit between the arc-extinguishing chamber and the contact system described in this utility model;

[0020] Figure 4 This is a three-dimensional schematic diagram of the grid plate and the perforated plate described in this utility model;

[0021] Figure 5 This is a schematic diagram showing the cooperation between the grid plate and the perforated plate of this utility model;

[0022] Figure 6 This is a schematic diagram of the electric arc after the grid plate and the perforated plate of this utility model are engaged;

[0023] Figure 7 This is a schematic diagram of the partition described in this utility model.

[0024] In the diagram: 1. Arc-extinguishing chamber; 11. Side plate; 12. Grid plate; 121. Notch; 122. Grid plate leg; 123. Riveting boss; 124. Stepped surface; 13. Gas generating component; 14. Deionization assembly; 141. Bracket; 142. Flame extinguishing plate bracket; 143. Filter assembly; 144. Sealing gasket; 15. Arc-extinguishing cover; 16. Pin assembly; 2. Contact system; 21. Moving contact; 22. Static contact. 3. Contact; 3. Housing; 31. Base; 32. Bottom plate; 100. Partition; 101. Elbow; 102. First mating hole; 103. Second mating hole; 104. Third mating hole; 105. Relief recess; 200. Moving arc eliminator; 201. Gas generating plate; 300. Orifice plate; 301. First vent hole row; 3011. Circular hole; 3012. Strip hole; 302. Second vent hole row. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] like Figure 1 The switch includes a disconnector and a circuit breaker. The switch comprises an arc-extinguishing chamber 1, a contact system 2, and a housing 3. The housing 3 includes a base 31 and a bottom plate 32, which are joined together to form the housing 3. Typically, the base 31 and the bottom plate 32 are secured using threaded fastening.

[0028] The contact system 2 includes a moving contact 21 and a stationary contact 22. The moving contact 21 is mounted on the base 31, while the stationary contact 22 is mounted on the base plate 32. Specifically, the moving contact 21 is rotatably mounted, while the stationary contact 22 is fixedly mounted. After the moving contact 21 actuates, it makes contact with or separates from the stationary contact 22. The arc-extinguishing chamber 1 is located on one side of the contact system 2 in the opening direction.

[0029] like Figure 2 , Figure 3The arc-extinguishing chamber 1 includes a pair of side plates 11 and multiple grid plates 12 disposed between the pair of side plates 11. It also includes a pair of partitions 100, each partition 100 being attached to the inner side of one side plate 11. A moving arc-inducing plate 200 is also provided on the side of the arrayed grid plates 12 corresponding to the moving contact 21. The array can also be referred to as a stack. A gas-generating element 13 is provided on the air inlet side of the arrayed grid plates 12. The gas-generating element 13 is a pair, each wrapping around one of the two grid plate legs 122 of the grid plate 12. A perforated plate 300 and an anti-ionization component 14 are provided on the air outlet side of the grid plate 12, and an arc-extinguishing cover 15 is installed above the anti-ionization component 14. Specifically, the perforated plate 300 is adjacent to the grid plate 12. Similarly, the anti-ionization component 14 is located on the air outlet side of the grid plate 12, and the arc-extinguishing cover 15 is located above the anti-ionization component 14. The gas generating component 13 is fixed to the grid leg 122 of the grid plate 12 by a pin assembly 16, and the gas generating component 13 is simultaneously riveted to the corresponding side plate 11.

[0030] like Figure 2 The flame extinguishing component 14 includes a support 141, which is hollow to form a receiving cavity. Inside the receiving cavity are a perforated plate 300, a flame extinguishing disc support 142, a filter assembly 143, and a sealing gasket 144. The perforated plate 300 is located at the bottom and adjacent to the grid plate 12, while the flame extinguishing disc support 142 is located above the perforated plate 300, and the filter assembly 143 is located above the flame extinguishing disc support 142. Specifically, the perforated plate 300, the flame extinguishing disc support 142, and the filter assembly 143 are all located inside the support 141 and are stacked on top of each other. The sealing gasket 144 covers the opening of the support 141, and the arc-extinguishing cap 15 covers the sealing gasket 144, that is, the arc-extinguishing cap 15 and the support 141 clamp the sealing gasket 144. The sealing gasket 144 can seal the installation gap around the bracket 141 and the arc-extinguishing cover 15, thereby improving the airtightness of the assembly between the arc-extinguishing cover 15 and the bracket 141.

[0031] The bracket 141 is fixed to a pair of side plates 11, for example by snap-fit ​​or riveting. The bracket 141 is fixed to the arc-extinguishing cover 15 by screws, thereby integrating the orifice plate 300, the flame extinguishing plate bracket 142, the filter assembly 143, and the sealing gasket 144 into a single unit.

[0032] like Figure 3 , Figure 4This is a side view of the arc-extinguishing chamber 1 and the contact system 2. The figure includes three directions: a first direction, a second direction, and a third direction, all perpendicular to each other. The first direction is the array direction of the grid plates 12, the second direction is the width direction of the grid plates 12, and the third direction is the height direction of the arc-extinguishing chamber, which can also be considered as the extension direction of the grid plates 12. See [link / reference] Figure 3 In this configuration, the upper end of the grid plate 12 in the third direction is the air outlet, and the lower end is the air inlet. Multiple grid plates 12 are arranged in an array spaced apart from each other in the first direction. A movable arc-inducing plate 200 is located on the side of the array of grid plates 12 corresponding to the moving contact 21. The upper end of the movable arc-inducing plate 200 is located on the outer side of the array of grid plates 12 along the first direction, and its lower end extends into the arc-extinguishing chamber 1. The movable arc-inducing plate 200 is located on the periphery of the array of grid plates 12. An air passage, or arc passage, is formed on the side of the movable arc-inducing plate 200 near the grid plate 12. The arc near the movable arc-inducing plate 200 moves along the air passage by the traction of the movable arc-inducing plate 200 and enters the grid plates 12 on the side of the array of grid plates 12 near the movable arc-inducing plate 200. A gas-generating plate 201 is also installed on the lower end of the movable arc-inducing plate 200 near the moving contact 21. The perforated plate 300 is located at the air outlet end of the grid plate 12 and is adjacent to the grid plate 12.

[0033] like Figure 4 The grid plate 12 includes a notch 121, grid plate legs 122, and mounting bosses 123. The notch 121 is located between a pair of grid plate legs 122, while the mounting bosses 123 are located on both sides of the width direction of the grid plate 12, that is, on both sides of the second direction. The mounting bosses 123 are used for riveting with the side plate 11.

[0034] The perforated plate 300 is arrayed with vent holes, which form at least one first vent hole row 301 and multiple second vent hole rows 302 in the width direction of the grid plate 12. Preferably, there are multiple first vent hole rows 301. Each first vent hole row 301 and each second vent hole row 302 corresponds to a gap between adjacent grid plates 12. In the array direction of the grid plates 12, i.e., the first direction, the first vent hole row 301 corresponds to the side of the moving contact 21, and includes circular holes 3011 and strip holes 3012; while the second vent hole row 302 corresponds to the side of the stationary contact 22, and includes only circular holes 3011. Due to the presence of strip holes 3012, which have better ventilation efficiency than circular holes 3011, it is beneficial for the electric arc to enter the grid plate 12 corresponding to the side of the moving contact 21.

[0035] Preferably, in the width direction of the grid 12, i.e., the second direction, the length of the strip hole 3012 is greater than the distribution length of the three circular holes 3011. Although in this embodiment, the diameters of the circular holes 3011 are not the same, the length occupied by the three circular holes 3011 in the second direction is the distribution length of the three circular holes 3011.

[0036] Preferably, in the array direction of the grid 12, the number of the first vent array 301 is greater than the number of the second vent array 302. More preferably, the number of the first vent array 301 is twice the number of the second vent array 302.

[0037] Preferably, in the height direction of the arc-extinguishing chamber 1, i.e., upward, the projection of the lower end of the moving arc-inducing plate 200 near the moving contact 21 on the orifice plate 300 is located within the distribution area of ​​the first vent row 301.

[0038] like Figure 5 In the first direction, the notches 121 on adjacent grid plates 12 are staggered. Specifically, in the second direction, one notch 121 on an adjacent grid plate 12 is located on the left and the other on the right. More specifically, with respect to the center line L of the grid plate 12 in the second direction, the notches 121 on adjacent grid plates 12 are located on both sides of the center line L, thus forming a staggered arrangement. Typically, after the grid plates 12 are manufactured, the aforementioned staggered notch 121 arrangement is achieved by flipping the adjacent grid plates 12.

[0039] In the width direction, i.e., the second direction, of the grid plate 12, the strip holes 3012 of the first vent array 301 are located at one end of the second direction, while the strip holes 3012 of another first vent array 301 adjacent to the first vent array 301 are located at the other end of the second direction. For example, if the strip hole 3012 of one first vent array 301 is located at the left end, then the strip hole 3012 of the first vent array 301 adjacent to that first vent array 301 is located at the right end. That is, the strip holes 3012 of two adjacent first vent arrays 301 are located at both ends of the width direction of the grid plate 12, i.e., both ends of the second direction. This creates a transverse airflow, which facilitates the entry of the electric arc into the stacked grid plates 12.

[0040] Preferably, there is only one strip hole 3012 in a first vent row 301.

[0041] Preferably, in the width direction of the grid plate 12, i.e., in the second direction, the length of the strip hole 3012 is less than half the length of the first vent hole row 301.

[0042] See you later Figure 5 Regarding the array of grid plates 12, in the array direction of the grid plates 12, i.e., the first direction, the lower end of the array of grid plates 12 corresponds to one end of the moving contact 21, while the upper end of the array of grid plates 12 corresponds to one end of the stationary contact 22. The offset direction of the strip-shaped holes 3012 in the first vent array 301 is consistent with the offset direction of the notches 121 on the grid plates 12 near the moving contact 21 corresponding to the first vent array 301. For example, in Figure 5 If the strip hole 3012 in the first vent hole row 301 is located at the left end in the second direction, then the notch 121 of the grid plate 12 below it is also offset to the left; if the strip hole 3012 in the first vent hole row 301 is located at the right end in the second direction, then the notch 121 of the grid plate 12 below it is also offset to the right.

[0043] like Figure 6 During the arc opening process, the upper end of the array of grid plates 21 in the first direction corresponds to the stationary contact 22, and the lower end in the first direction corresponds to the moving contact 21. When the moving contact 21 separates from the stationary contact 22, an arc is generated between them. The arc extends from point A to point B as the moving contact 21 opens. During the above process, since the strip holes 3012 in the adjacent first vent array 301 are located at both ends of the width direction of the grid plate 12, i.e., at both ends of the second direction, the resulting airflow field stretches the arc into a Z-shape. At the same time, since the offset direction of the strip holes 3012 in the first vent array 301 is consistent with the offset direction of the notch 121 on the grid plate 12 near the moving contact 21 corresponding to the first vent array 301, the arc is stretched into a Z-shape. Thus, the Z-shaped arrangement of the array of grid plates 12, with its multiple notches 12 arranged in a matching shape, facilitates the rapid entry of the electric arc into the notches 12 of the grid plates 12, and promotes the rapid entry of the electric arc into the stacked grid plates 12.

[0044] like Figure 7 This is a schematic diagram of the partition 100. The partition 100 is made of insulating material. There is a pair of partitions 100, which are respectively attached to the inner surfaces of a pair of side plates 11. The inner surfaces refer to the two sides of the pair of side plates 11 that face each other.

[0045] The partition 100 is made of an insulating material that does not contain fiberglass. The side plate 11 is made of an insulating material that contains fiberglass. The two are bonded together, and the partition 100 is located inside the side plate 11. This arrangement prevents the side plate 11 from being burned by the electric arc and prevents particles from adhering to the grid plate 12 after being burned, thus affecting the normal operation of the grid plate 12. Furthermore, the retention of the side plate 11, which has high strength, ensures the structural stability of the arc-extinguishing chamber 1. The partition 100, which does not contain fiberglass, is located inside the side plate 11, preventing the side plate 11 from being burned by the electric arc and protecting it; therefore, the material composition of the side plate 11 is not a concern. Moreover, the partition 100 does not produce particles after being burned, and this will not affect the normal operation of the grid plate 12.

[0046] Combination Figure 2 , Figure 4 Specifically, the partition 100 has an elbow 101 at the air outlet end corresponding to the grid plate 12, thus forming an "L" shape. The elbow 101 is flat and rests on the steps 124 on both sides of the air outlet end of the grid plate 12. The steps 124 are located on both sides of the end of the grid plate 12 closest to the perforated plate 300, that is, on both sides of the upper end of the grid plate 12 in the third direction.

[0047] A flange 125 is formed at the air outlet end of the grid plate 12. Specifically, the flange 125 is located between a pair of steps 124, and the front end of the flange 125 extends into the interior of the bracket 141 and abuts against the perforated plate 300. The elbow 101 abuts against the lower edge of the bracket 141.

[0048] Preferably, the shape of the partition 100 matches the shape of the side plate 11, so that, in the width direction of the grille 12, i.e., the second direction, the projection of the portion of the step 124 of the grille 12 facing the air inlet side of the grille 12 onto the side plate 11 is located inside the projection of the partition 100 onto the side plate 11. That is, the projection of the portion of the grille 12 located at the lower part of the step 124 in the third direction onto the side plate 11 is located inside the projection of the partition 100 onto the side plate 11. More preferably, in the width direction of the grille 12, i.e., the second direction, the projection of the movable arc-guiding plate 200 onto the side plate 11 is located inside the projection of the partition 100 onto the side plate 11.

[0049] The partition 100 has a first mating hole 102, a second mating hole 103, and a third mating hole 104. Specifically, the first mating hole 102 is used for the mounting boss 123 to pass through. Preferably, the shape of the first mating hole 102 matches that of the mounting boss 123, and both are square.

[0050] The second mating hole 103 is used for the installation end of the gas generating component 13 to pass through, that is, after the installation end of the gas generating component 13 passes through the second mating hole 103, it is riveted to the side plate 11.

[0051] The third mating hole 104 is used for the mounting end of the moving arc-guiding piece 200 to pass through, that is, after the mounting end of the moving arc-guiding piece 200 passes through the third mating hole 104, it is riveted to the side plate 11.

[0052] The partition 100 has a clearance recess 105 on the side near the gas generating component 13. That is, the partition 100 has a clearance recess 105 at its lower end in the third direction. The clearance recess 105 clears the contact surface between the gas generating component 13 and the side plate 11.

[0053] Preferably, after the partition 100 is installed, the partition 100 is clamped by the grid plate 12 and the side plate 11 to improve the installation and positioning effect of the partition 100.

Claims

1. An arc-extinguishing chamber for a switch, the switch comprising an arc-extinguishing chamber (1) and a contact system (2), wherein the arc-extinguishing chamber (1) is located on one side of the contact system (2) in the opening direction, the arc-extinguishing chamber (1) comprising a pair of side plates (11) and a plurality of grid plates (12) disposed between the pair of side plates (11), and a perforated plate (300) is provided on one side of the outlet of the plurality of grid plates (12), characterized in that: The perforated plate (300) has at least one first vent array (301) formed on one side of the moving contact (21) of the contact system (2). Each first vent array (301) corresponds to a gap between adjacent grid plates (12). The first vent array (301) includes a circular hole (3011) and a strip hole (3012). The strip holes (3012) in two adjacent first vent arrays (301) are located at both ends of the width direction of the grid plate (12).

2. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The perforated plate (300) has a plurality of second vent rows (302) formed on one side of the corresponding stationary contact (22). Each second vent row (302) corresponds to a gap between adjacent grid plates (12). The second vent row (302) includes only circular holes (3011).

3. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: The grid plate (12) includes a notch (121) and grid plate legs (122). The notch (121) is located between a pair of grid plate legs (122) and the notches (121) are staggered. The offset direction of the strip hole (3012) in the first vent hole row (301) is consistent with the offset direction of the notch (121) on the grid plate (12) on the side of the first vent hole row (301) closer to the moving contact (21).

4. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: In the width direction of the grid plate (12), the length of the strip hole (3012) is greater than the distribution length of the three circular holes (3011).

5. The arc-extinguishing chamber of a switch according to claim 2, characterized in that: There are multiple first vent arrays (301), and the number of first vent arrays (301) is greater than the number of second vent arrays (302).

6. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: A movable arc-inducing plate (200) is provided on one side of the grid plate (12) corresponding to the movable contact (21). The upper end of the movable arc-inducing plate (200) is located outside the grid plate (12) along the array direction of the grid plate (12), and its lower end extends into the arc-extinguishing chamber (1). The movable arc-inducing plate (200) is located on the periphery of the grid plate (12). In the height direction of the arc-extinguishing chamber (1), the projection of the lower end of the movable arc-inducing plate (200) near the movable contact (21) on the orifice plate (300) is located within the distribution area of ​​the first vent row (301).

7. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: One of the first vent arrays (301) has a strip-shaped hole (3012) and a plurality of circular holes (3011).

8. The arc-extinguishing chamber of a switch according to claim 5, characterized in that: The number of the first vent array (301) is twice the number of the second vent array (302).

9. The arc-extinguishing chamber of a switch according to claim 1, characterized in that: In the width direction of the grid plate (12), the length of the strip hole (3012) is less than half the length of the first vent hole row (301).

10. A switch, characterized in that: The device includes a contact system (2), a housing (3), and an arc-extinguishing chamber (1) as described in any one of claims 1 to 9; the housing (3) includes a base (31) and a bottom plate (32), which are joined together to form the housing (3); the contact system (2) includes a moving contact (21) and a stationary contact (22), the moving contact (21) being mounted on the base (31) and the stationary contact (22) being mounted on the bottom plate (32).

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