Arc extinguish chamber structure of switch

Abstract

An arc extinguish chamber structure of a switch belongs to the technical field of low-voltage apparatuses. The arc extinguish chamber comprises a pair of side plates, a plurality of grid pieces arranged between the pair of side plates and a pair of gas generating pieces, the grid pieces are arranged at intervals, and the pair of gas generating pieces are respectively located at the lower edges of the grid pieces. The arc extinguish chamber is characterized in that a partition plate piece is further arranged on the inner side of each side plate and comprises a plate part and a gas generating part extending from the plate part to the grid pieces; and the gas generating part is embedded into a gap between the adjacent grid sheets. The device has the advantages that the gas generating part extending towards the grid plate is arranged on the partition plate piece, so that on one hand, insulating gas is generated to accelerate arc extinguishing; and on the other hand, airflow in the arc extinguish chamber can be ensured to push the arc to be in the middle position, and the arc is prevented from transversely moving to the edge of the grid plate.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical appliance technology, specifically relating to an arc-extinguishing chamber structure for a switch. 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] In the prior art, during the movement of the electric arc within the grid, the arc often moves laterally to the edge of the grid. This situation is not conducive to the arc being centered and moving to the outlet side of the grid cutting area, which is not beneficial for extinguishing the arc. Utility Model Content

[0004] The purpose of this invention is to provide an arc-extinguishing chamber structure for a switch, which has a gas-generating component and a partition. By providing a gas-generating part extending towards the grid plate on the partition plate, it generates insulating gas to accelerate the extinction of the electric arc. On the other hand, it ensures that the airflow inside the arc-extinguishing chamber pushes the electric arc to a central position and prevents the electric arc from shifting laterally to the edge of the grid plate.

[0005] The purpose of this utility model is achieved as follows: an arc-extinguishing chamber structure for a switch, wherein the arc-extinguishing chamber includes a pair of side plates, multiple grid plates disposed between the pair of side plates, and a pair of gas-generating elements. The multiple grid plates are spaced apart from each other, and the pair of gas-generating elements are respectively located at the lower edge of the grid plates. A partition is also provided on the inner side of each side plate. The partition includes a plate portion and a gas-generating portion extending from the plate portion toward the grid plate. The gas-generating portion is embedded in the gap between adjacent grid plates.

[0006] In a specific embodiment of this utility model, the gas generating part includes a protrusion and an extension rib. The protrusion protrudes into the interior of the arc-extinguishing chamber, while one end of the extension rib is connected to the protrusion and the other end extends toward the gas outlet side of the grid plate.

[0007] In another specific embodiment of this utility model, the plate portion is further provided with a receiving hole, which is used to cooperate with the mounting protrusions on both sides of the grid plate.

[0008] In another specific embodiment of this utility model, the gas generating portion is distributed in the area of ​​the arc-extinguishing chamber near the stationary contact.

[0009] In another specific embodiment of this utility model, the extending rib is in the shape of a straight strip.

[0010] In a further specific embodiment of this utility model, the edge of the protrusion near the air outlet of the grid plate is a straight bevel.

[0011] In a further specific embodiment of this utility model, the lower part of the plate has a clearance notch, which is used to allow the gas generating component to pass; a clearance groove is also provided on the clearance notch, which is also used to allow the gas generating component to pass.

[0012] In yet another specific embodiment of this utility model, corresponding to the outer area of ​​the gas generating section, a fixing hole is provided on the side plate, and the mounting protrusions on both sides of the grid plate extend through the receiving hole and are fixed to the side plate.

[0013] In yet another specific embodiment of this utility model, the gas generating component includes a covering surface and a back plate. The covering surface is an inwardly inclined flat surface located inside the grid leg of the grid plate. The back plate and the covering surface form a funnel, and the grid leg of the grid plate is located inside the funnel. The back plate is attached to the side plate.

[0014] In a further specific embodiment of this utility model, the gas generating component further includes a partition rib and an internal partition rib, both of which cooperate with the protrusion. The lower edge of the protrusion cooperating with the internal partition rib extends further into the gas generating component than the lower edge of the protrusion cooperating with the partition rib.

[0015] The present invention has the following advantages due to the above-mentioned structure: by providing a gas generating part on the partition extending towards the grid plate, on the one hand, it generates insulating gas to accelerate the extinction of the electric arc; on the other hand, it can ensure that the airflow inside the arc extinguishing chamber pushes the electric arc to a central position and prevents the electric arc from shifting to the edge of the grid plate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the switch in this utility model;

[0017] Figure 2 This is a three-dimensional schematic diagram of the moving contact and one side of the arc-extinguishing chamber in this utility model;

[0018] Figure 3 This is a three-dimensional schematic diagram of the moving contact and the other side of the arc-extinguishing chamber in this utility model;

[0019] Figure 4 This is a frontal schematic diagram of the cooperation between the moving contact and the arc-extinguishing chamber in this utility model;

[0020] Figure 5 This is a partial explosion diagram of the arc-extinguishing chamber in this utility model;

[0021] Figure 6 This is a three-dimensional schematic diagram of one side of the partition plate component of this utility model;

[0022] Figure 7 This is a three-dimensional schematic diagram of the other side of the partition plate component of this utility model;

[0023] Figure 8 This is a three-dimensional schematic diagram of one side of the gas-generating component in this utility model;

[0024] Figure 9 This is a three-dimensional schematic diagram of the other side of the gas-producing component in this utility model;

[0025] Figure 10 This is a frontal sectional view of the arc-extinguishing chamber in this utility model.

[0026] In the diagram: 1. Arc-extinguishing chamber; 11. Side plate; 12. Grid plate; 13. Moving arc-starting plate; 14. Gas-generating component; 141. Extension; 1411. Groove; 142. Covering part; 143. Rib; 1431. Hanging hole; 144. Fin; 145. Internal rib; 146. Back plate; 15. Arc-extinguishing cover; 16. Anti-freezing bracket; 2. Moving contact; 21. Contact piece; 211. Short contact piece; 2111. First arc contact point; 2112. First arc contact point. 212. Long contact piece, 2121. Second arc contact, 2122. Second main contact; 3. Housing, 31. Base, 32. Base plate; 100. Partition, 101. Plate part, 1011. Bending part, 1012. Receiving hole, 1013. Mating edge, 1014. Relief notch, 10141. Relief groove; 102. Gas generating part, 1021. Protrusion, 1022. Extension rib; 200. Arc-starting head, 300. Trumpet mouth. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] like Figure 1 , Figure 2 The switch includes a disconnector and a circuit breaker. The switch comprises an arc-extinguishing chamber 1, a contact system, 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.

[0030] The contact system includes a moving contact 2 and a stationary contact (not shown). The moving contact 2 is mounted on the base 31, while the stationary contact is mounted on the base plate 32. Specifically, the moving contact 2 is rotatably mounted, while the stationary contact is fixedly mounted. After the moving contact 2 actuates, it makes contact with or separates from the stationary contact. The arc-extinguishing chamber 1 is located on one side of the contact system in the opening direction.

[0031] like Figure 2 , Figure 3 , Figure 4 The arc-extinguishing chamber 1 includes a pair of side plates 11 and multiple grid plates 12 disposed between the pair of side plates 11. The multiple grid plates 12 are spaced apart from each other. The arc-extinguishing chamber 1 also includes a moving arc-initiating plate 13, a deionization component, and an arc-extinguishing cover 15. One end of the moving arc-initiating plate 13 is placed outside the array of grid plates 12 and spaced apart from a nearby grid plate 12. The other end is bent and extends into the interior of the arc-extinguishing chamber 1, forming the extension end of the moving arc-initiating plate 13. The moving arc-initiating plate 13 is located on the side corresponding to the moving contact 2. The deionization component is used to deionize the gas at the outlet side of the grid plate 12. Typically, the deionization component should include a perforated plate (not shown). The perforated plate is located at the outlet side of the grid plate 12 and is adjacent to the grid plate 12.

[0032] The deionization component includes a deionization bracket 16, which is frame-shaped and houses the filter unit of the deionization component. A pair of side plates 11 are fixed to both sides of the deionization bracket 16.

[0033] The arc-extinguishing cover 15 is located at the top of the arc-extinguishing chamber 1, and has an exhaust hole thereon. The gas inside the arc-extinguishing chamber 1 is discharged to the outside of the arc-extinguishing chamber 1 through the exhaust hole on the arc-extinguishing cover 15.

[0034] The arc-extinguishing chamber 1 further includes a pair of gas-generating elements 14, which are located at the lower edge of the grid plate 12. Preferably, the gas-generating elements 14 enclose a pair of grid plate legs of the grid plate 12. The pair of gas-generating elements 14 are arranged opposite to each other and form a flared opening 300 with a reduced diameter in the upward direction, i.e., the flared opening 300 is wider at the bottom and narrower at the top. The flared opening 300 refers to the portion that tapers inward in the upward direction, excluding a straight portion with a constant width or an enlarged portion with a gradually increasing width in the upward direction.

[0035] The above-described configuration allows the electric arc to be focused and enters the grid plate 12 through the flared opening 300. Furthermore, the flared opening 300 accelerates the airflow, facilitating the rapid entry of the electric arc into the grid plate 12.

[0036] See you later Figure 3 , Figure 4 The moving contact 2 includes multiple contact pieces 21 arranged side-by-side. Each contact piece 21 includes short contact pieces 211 and long contact pieces 212. Specifically, the long contact pieces 212 have a greater extension length than the short contact pieces 211. Preferably, the long contact pieces 212 are centered, while the short contact pieces 211 are located on either side of the long contact pieces 212. In this embodiment, more specifically, four long contact pieces 212 form a group, and two groups of four short contact pieces 211 are arranged on either side of one group of long contact pieces 212.

[0037] The short contact piece 211 has a first arc contact 2111 and a first main contact 2112. Similarly, the long contact piece 212 has a second arc contact 2121 and a second main contact 2122. After the short contact piece 211 and the long contact piece 212 are installed, the first arc contact 2111 and the second arc contact 2121 are flush in the extension direction of the contact piece 21. Similarly, preferably, the first main contact 2112 and the second main contact 2122 are flush in the extension direction of the contact piece 21. In this utility model, both the long contact piece 212 and the short contact piece 211 are defined as arc contacts, and both have the function of arc generation. The stationary contact is provided with a stationary main contact (not shown) that cooperates with the first main contact 2112 and the second main contact 2122. Meanwhile, the stationary contact also has a stationary arc contact (not shown) that engages with the second arc contact 2121, and the stationary arc contact also engages with at least one of the first arc contacts 2111.

[0038] This invention ensures the short-term withstand capability and operational reliability of the switch by having a first arc contact 2111 and a first main contact 2112 on the short contact piece 211, and a second arc contact 2121 and a second main contact 2122 on the long contact piece 212. At the same time, in the extension direction of the contact piece 21, the long contact piece 212 also has an arc-inducing head 200 that is higher than the short contact piece 211, thereby improving the ability of the moving contact 2 to quickly introduce the arc into the arc-extinguishing chamber.

[0039] Compared with the prior art, the above-mentioned setting reduces the lever arm of the long contact 212 when it collides with the stationary contact when the moving contact 2 closes, by moving the second arc contact 2121 on the long contact 212 to a position flush with the first arc contact 2111 on the short contact 211. This prevents the long contact 212 from breaking or deforming.

[0040] Secondly, the short contact 211 is provided with the first arc contact 2111. When a large current is interrupted, if the short contact 212 is broken down, the presence of the first arc contact 2111 can greatly improve the burn-resistant performance of the short contact 211, thereby improving the life of the contact system.

[0041] Preferably, the overtravel of the long contact 212 is less than that of the short contact 211, meaning the long contact 212 separates from the stationary contact later than the short contact 211. Therefore, when interrupting a small current, the arc is generated only on the long contact 212. However, when interrupting a large current, the arc is generated on both the long contact 212 and the short contact 211. In other words, the long contact 212 has the function of closing first and then opening later compared to the short contact 211.

[0042] The long contact piece 212 also has an arc-inducing head 200, which refers to the portion of the long contact piece 212 that is higher than the short contact piece 211. Preferably, for the long contact piece 212, the arc-inducing head 200 is located on one side of the second arc contact point 2121 toward the swing end of the long contact piece 212.

[0043] See Figure 4 Preferably, the arc-drawing head 200 is sickle-shaped and extends curved toward the back of the long contact piece 212.

[0044] Specifically, the height H of the arc-starting head 200 is 7 to 20 mm. More preferably, the height of the arc-starting head 200 is 12 to 20 mm. The above range is the preferred range obtained through multiple experimental verifications.

[0045] More specifically, the surface of the arc-initiating head 200 facing the stationary contact is an arc surface, which facilitates the upward movement of the electric arc along the arc surface.

[0046] The arc-initiating head 200 extends into the flared opening 300, or passes through the flared opening 300 and then extends out of it. Therefore, the arc-initiating head 200 can guide the arc to quickly enter the flared opening 300, or guide the arc to quickly pass through the flared opening 300. Simultaneously, the first arc contact 2111 and the second arc contact 2121 are located outside the flared opening 300.

[0047] like Figure 5 , Figure 6 , Figure 7 A partition 100 is also provided on the inner side of each side plate 11. Preferably, the partition 100 is held between the side plate 11 and the grid plate 12, so that the two outer sides of the grid plate 12 are the partition 100, and the two outer sides of the partition 100 are the side plate 11. The fixing boss on the grid plate 12 passes through the partition 100 and is fixed to the side plate 11. The partition 100 also cooperates with the gas generating component 14. Specifically, the lower side of the partition 100 and the upper side of the gas generating component 14 have a contacting relationship. Of course, it is also possible that the partition 100 and the gas generating component 14 are separately arranged, with a certain gap between them. The partition 100 and the gas generating component 14 are separately arranged, that is, they are two parts.

[0048] like Figure 6 , Figure 7 The partition member 100 includes a plate portion 101 and a gas-generating portion 102 extending from the plate portion 101 toward the grid plate 12. Specifically, the gas-generating portion 102 is embedded in the gap between adjacent grid plates 12.

[0049] Combination Figure 10 The top of the plate portion 101 has a curved portion 1011, which engages with the shoulder of the grid plate 12, that is, the curved portion 1011 rests on the shoulder of the grid plate 12 on the side of the air outlet, thereby covering the shoulder of the grid plate 12.

[0050] See you later Figure 6 , Figure 7The plate portion 101 is further provided with receiving holes 1012, which are used to cooperate with the mounting protrusions on both sides of the grid plate 12 and the mounting protrusions on both sides of the moving arc-guiding plate 13, that is, the mounting protrusions on both sides of the grid plate 12 are embedded in the receiving holes 1012. Preferably, corresponding to the outer area of ​​the gas generating portion 102, a fixing hole is provided on the side plate 11, and the mounting protrusions on both sides of the grid plate 12 extend through the receiving holes 1012 and are fixed to the side plate 11.

[0051] On one side edge of the plate portion 101 corresponding to the stationary contact, there is also a mating edge 1013. The mating edge 1013 mates with the stationary contact.

[0052] Preferably, the gas-generating sections 102 are distributed in the region of the arc-extinguishing chamber 1 near the stationary contact, that is, the gas-generating sections 102 cooperate with the grid plates 12 corresponding to the stationary contact side. In other words, the grid plates 12 corresponding to the stationary contact side are inserted between adjacent gas-generating sections 102. Multiple gas-generating sections 102 are spaced apart.

[0053] See you later Figure 6 and combined Figure 10 The gas-generating section 102 includes a protrusion 1021 and an extension rib 1022. Specifically, the protrusion 1021 is mountain-shaped and protrudes into the interior of the arc-extinguishing chamber 1, while one end of the extension rib 1022 is connected to the protrusion 1021, and the other end extends towards the gas outlet side of the grid plate 12. Preferably, the extension rib 1022 is straight.

[0054] The protrusion 1021 has a cast groove on its outer edge. The protrusion 1021 cooperates with the gas-generating component 14 and, together with the flared nozzle 300, forms a complete Laval nozzle. This improves the gas field inside the arc-extinguishing chamber 1, facilitating arc extinguishing. Preferably, the upper edge of the protrusion 1021, i.e., the edge of the protrusion 1021 near the gas outlet of the grid plate 12, is a straight bevel.

[0055] By providing a gas-generating section 102 extending towards the grid plate 12 on the partition plate 100, the gas-generating section 102 generates insulating gas to accelerate the extinction of the electric arc; on the other hand, the gas-generating section 102 can ensure that the airflow inside the arc-extinguishing chamber pushes the electric arc to a central position and prevents the electric arc from shifting laterally to the edge of the grid plate.

[0056] See Figure 7The partition member 100 has a clearance notch 1014 at the bottom of its plate portion 101. This clearance notch 1014 is used to allow space for the gas-generating component 14, specifically, the portion of the gas-generating component 14 near the side plate 11. A clearance groove 10141 is also provided on the clearance notch 1014. Similarly, the clearance groove 10141 is also used to allow space for the gas-generating component 14.

[0057] like Figure 8 , Figure 9 This is a schematic diagram of the gas-generating component 14, and in conjunction with... Figure 10 The gas generating component 14 includes an extension 141, a covering surface 142, a rib 143, fins 144, internal ribs 145, and a back plate 146. The extension 141 is located at the lower edge of the entire gas generating component 14 and extends toward the contact system.

[0058] Preferably, the extension 141 has a closed groove 1411 on its inner side.

[0059] Preferably, the covering surface 142 is an inwardly inclined flat surface located inside the grid legs of the grid plate 12. The covering surfaces 142 of a pair of gas generating elements 14 form the flared opening 300. The partition rib 143 extends upward from the inside of the covering surface 142 and extends beyond the covering surface 142. The inner partition rib 145 also extends upward from the inside of the covering surface 142, but does not exceed the upper edge of the covering surface 142. The partition rib 143 and the inner partition rib 145 are both embedded between adjacent grid plates 12, thereby isolating the feet of the grid legs of the grid plate 12. The partition rib 143 also has a mounting hole 1431 for mounting the gas generating element 14 to the grid plate 12.

[0060] The fin 144 is located on the side of the covering surface 142 near the notch of the grid 12. That is, the grid 144 is located inside the flared opening 300, and preferably, the fin 144 is triangular. The fin 144 can increase the contact area between the electric arc and the gas generating element 14, which is beneficial to the extinguishing of the electric arc.

[0061] The back plate 146 is located on the side of the gas generating component 14 closest to the side plate 11. Specifically, the back plate 146 is fitted to the side plate 11, and a mounting boss for connecting the gas generating component 14 to the side plate 11 is also provided on the back plate 146. The back plate 146 and the covering surface 142 form a funnel, and the grid legs of the grid plate 12 are located inside the funnel, with the back plate 146 fitted to the side plate 11.

[0062] Both the partition 143 and the inner partition 145 mate with the protrusion 1021. Specifically, the lower edge of the protrusion 1021 that mates with the inner partition 145 extends further into the gas generating component 14 than the lower edge of the protrusion 1021 that mates with the partition 143.

[0063] The gas-generating section 102 has a mounting groove that opens toward the side plate 11. A fixing rod passes through the mounting groove and through the mounting hole on the grid plate 12, thereby achieving the mounting and positioning of the grid plate 12 and the gas-generating component 14.

Claims

1. An arc-extinguishing chamber structure for a switch, wherein the arc-extinguishing chamber (1) comprises a pair of side plates (11), a plurality of grid plates (12) disposed between the pair of side plates (11), and a pair of gas-generating elements (14), wherein the plurality of grid plates (12) are spaced apart from each other, and the pair of gas-generating elements (14) are respectively located at the lower edge of the grid plates (12), characterized in that: A partition (100) is also provided on the inner side of each side plate (11). The partition (100) includes a plate portion (101) and a gas-generating portion (102) extending from the plate portion (101) toward the grid plate (12). The gas-generating portion (102) is embedded in the gap between adjacent grid plates (12).

2. The arc-extinguishing chamber structure of a switch according to claim 1, characterized in that: The gas generating section (102) includes a protrusion (1021) and an extension rib (1022). The protrusion (1021) protrudes into the interior of the arc-extinguishing chamber (1), and one end of the extension rib (1022) is connected to the protrusion (1021), while the other end extends toward the gas outlet side of the grid plate (12).

3. The arc-extinguishing chamber structure of a switch according to claim 1, characterized in that: The plate (101) is also provided with a receiving hole (1012), which is used to cooperate with the mounting protrusions on both sides of the grid plate (12).

4. The arc-extinguishing chamber structure of a switch according to claim 3, characterized in that: The gas generating section (102) is located in the area of ​​the arc extinguishing chamber (1) near the stationary contact.

5. The arc-extinguishing chamber structure of a switch according to claim 2, characterized in that: The extension rib (1022) is a straight strip.

6. The arc-extinguishing chamber structure of a switch according to claim 2, characterized in that: The edge of the protrusion (1021) near the air outlet of the grid plate (12) is a straight slope.

7. The arc-extinguishing chamber structure of a switch according to claim 1, characterized in that: The plate portion (101) has a clearance notch (1014) at its lower part, which is used to allow the gas generating component (14) to pass; a clearance groove (10141) is also provided on the clearance notch (1014), which is also used to allow the gas generating component (14) to pass.

8. The arc-extinguishing chamber structure of a switch according to claim 4, characterized in that: Corresponding to the outer area of ​​the gas generating section (102), a fixing hole is provided on the side plate (11), and the mounting protrusions on both sides of the grid plate (12) extend through the receiving hole (1012) and are fixed to the side plate (11).

9. The arc-extinguishing chamber structure of a switch according to claim 2, characterized in that: The gas generating component (14) includes a covering surface (142) and a back plate (146). The covering surface (142) is a flat surface that is inclined inward and is located inside the grid leg of the grid plate (12). The back plate (146) and the covering surface (142) form a funnel. The grid leg of the grid plate (12) is located inside the funnel. The back plate (146) is attached to the side plate (11).

10. The arc-extinguishing chamber structure of a switch according to claim 9, characterized in that: The gas generating component (14) further includes a partition rib (143) and an inner partition rib (145), both of which cooperate with the protrusion (1021). The lower edge of the protrusion (1021) that cooperates with the inner partition rib (145) extends further into the gas generating component (14) than the lower edge of the protrusion (1021) that cooperates with the partition rib (143).

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