Contact arc extinguishing system of switch

Abstract

A contact arc extinguishing system of a switch belongs to the technical field of low-voltage apparatuses. Comprising an arc extinguish chamber and a contact system, the arc extinguish chamber comprises side walls, gas generating pieces, a movable arc striking piece and grid pieces, the grid pieces are arrayed between a pair of side walls, a pair of gas generating pieces are arranged at intervals to form an arc channel, the contact system comprises a movable contact, the movable contact comprises a long contact piece, the long contact piece extends into the arc channel, the movable arc striking piece is arranged corresponding to one side of the movable contact, and the long contact piece extends into the arc channel. A gas containing cavity is arranged between the pair of gas generating pieces and corresponds to the lower portion of the movable arc striking piece, one side, facing the long contact piece, of the gas containing cavity is provided with an opening, and the other three side faces of the gas containing cavity are in a surrounding state. The arc extinguish chamber has the advantages that as the gas accommodating cavity is arranged at the position corresponding to the lower part of the movable arc striking sheet, arc gas can be prevented from overflowing downwards from the rear part of the long contact sheet and being contacted with the short contact sheet by the gas accommodating cavity, so that the short contact sheet is prevented from being broken down by the arc, and the air pressure in the arc extinguish chamber is ensured.

Description

Technical Field

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

[0002] Switches, especially disconnecting switches, are important low-voltage electrical devices that enable the control of the opening and closing of the carrying current to meet the requirements of power supply network on / off management.

[0003] Based on their specific functions of carrying current and initiating arcs, existing disconnecting switches typically employ long and short moving contact pieces. When the disconnecting switch is closed, the shorter contact piece, with its larger length and contact area compared to the longer one, provides a better current conduction path, ensuring a uniform and stable current distribution between the contacts and preventing localized overheating and erosion. Simultaneously, the shorter contact piece can withstand greater mechanical and thermal stresses, ensuring the stability and reliability of the switch during long-term operation. The longer contact piece, due to its greater length, allows the arc to be generated closer to the grid plates in the arc-extinguishing chamber, facilitating arc extinguishing.

[0004] In summary, while the aforementioned long and short contact design of the moving contact allows different contacts to perform the functions of current carrying and arc initiation, and helps to shorten the distance between the arc initiation position and the arc-extinguishing chamber, thus accelerating arc extinction, a significant drawback exists. When an arc is generated, ionized gas containing metal vapor diffuses downwards into the contact cavity under the influence of airflow or magnetic fields. At this point, the insulation strength is reduced, making breakdown highly likely. Furthermore, with the long and short contact design, if the short moving contact breaks down, it can cause the arc to retreat, resulting in breaking failure. This has long been a technical problem that the industry has been struggling to solve. Utility Model Content

[0005] The objective of this invention is to provide a contact arc extinguishing system for a switch that helps to prevent electric arc from overflowing downwards from the long contact and making contact with the short contact, thereby preventing breakdown at the short contact and improving airtightness.

[0006] The present invention achieves its objective as follows: a contact arc-extinguishing system for a switch, comprising an arc-extinguishing chamber and a contact system. The arc-extinguishing chamber includes side walls, gas-generating elements, a moving arc-inducing plate, and grid plates. Multiple grid plates are arranged in an array between a pair of side walls. A pair of gas-generating elements are spaced apart to form an arc channel. The contact system includes a moving contact, which includes a long contact plate that extends into the arc channel. The moving arc-inducing plate is disposed on one side corresponding to the moving contact. A gas-containing cavity is disposed between the pair of gas-generating elements and below the moving arc-inducing plate. The gas-containing cavity is open on one side facing the long contact plate, while the other three sides form an enclosed state.

[0007] In one embodiment of the present invention, the moving contact structure of the contact system further includes a short contact piece, which is located outside the arc channel and also outside the arc extinguishing chamber.

[0008] In another specific embodiment of this utility model, the arc-extinguishing chamber further includes a magnetizing block mounting boss, which is disposed between the pair of gas generating elements, and the magnetizing block mounting boss is located on the side of the moving arc-initiating plate away from the arc inlet of the arc-extinguishing chamber; the gas containing cavity is located below the magnetizing block mounting boss.

[0009] In another embodiment of the present invention, the shape of the magnetizing block mounting boss is a weir forming a magnetizing block receiving cavity, and a magnetizing block with a shape and size matching the magnetizing block receiving cavity is provided in the magnetizing block receiving cavity.

[0010] In another embodiment of the present invention, at least one magnetizing block defining flange is formed on the bottom wall of the magnetizing block receiving cavity and on the side facing the magnetizing block, and a magnetizing block defining flange fitting hole is formed on the magnetizing block and at the position corresponding to the magnetizing block defining flange. The magnetizing block is positioned in the magnetizing block receiving cavity by the tenon and tenon engagement between the magnetizing block defining flange fitting hole and the magnetizing block defining flange.

[0011] In another embodiment of this utility model, the magnetizing block is made of magnet steel.

[0012] In a further embodiment of the present invention, the gas containing cavity is formed by a first cavity wall, a second cavity wall and a third cavity wall, wherein the second cavity wall is a longitudinal cavity wall and is connected to the horizontal first cavity wall and the third cavity wall.

[0013] In a further embodiment of the present invention, the moving arc-inducing plate includes a lower end plate, an upper end plate, and a connecting plate. The lower end plate is located at the lower end of the connecting plate extending downward, while the upper end plate is located at the upper end of the connecting plate extending in the direction toward the arc-extinguishing chamber.

[0014] In yet another embodiment of the present invention, the pair of gas generating components includes a left gas generating component and a right gas generating component. A first insertion groove is formed on the left gas generating component and located between the gas receiving cavity and the magnetizing block mounting boss, while a second insertion groove is provided on the right gas generating component. An extension edge extends from each side of the lower end plate, and the extension edge is respectively fitted into the first insertion groove and the second insertion groove.

[0015] In yet another embodiment of the present invention, an extended region is formed in the area between the pair of gas generating elements and below the moving arc plate, thereby increasing the spacing width between the extended region and the gas generating elements, and the gas receiving cavity is located within the extended region.

[0016] The technical solution provided by this utility model has a gas-containing cavity set below the moving arc-initiating piece, and the gas-containing cavity is open on one side facing the long contact piece of the moving contact, while the other three sides are enclosed. Therefore, the gas-containing cavity can prevent the arc gas from overflowing from the back of the long contact piece and coming into contact with the short contact piece, thereby avoiding the short contact piece from being broken down by the arc and ensuring the gas pressure inside the arc-extinguishing chamber. Attached Figure Description

[0017] Figure 1 This is a partial schematic diagram of the switch involved in this utility model;

[0018] Figure 2 This is a partial schematic diagram of the arc-extinguishing chamber of the contact arc-extinguishing system of the switch of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal side of the arc-extinguishing chamber involved in this utility model;

[0020] Figure 4 This is a three-dimensional exploded view of the arc-extinguishing chamber involved in this utility model;

[0021] Figure 5 for Figure 4 A schematic diagram showing the view from another side of the state;

[0022] Figure 6 for Figure 1 The diagram shows the moving contact. Detailed Implementation

[0023] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0024] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are, unless otherwise specified, based on the current position. Figure 1 The location and state are taken as a reference, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0025] Please see Figure 1The diagram shows an arc-extinguishing chamber 1 and a contact system, and also shows a housing 3, which includes a base and a bottom plate joined together to form the aforementioned housing 3. The housing cavity of the housing 3 has a contact receiving cavity for accommodating the aforementioned contact system, and the arc-extinguishing chamber 1 is installed on the side of the aforementioned contact receiving cavity from which the gas exits.

[0026] The aforementioned arc-extinguishing chamber 1 is located above the aforementioned contact system. The aforementioned contact system includes a moving contact 2 and a stationary contact, and the moving contact 2 is rotatably configured. After the moving contact 2 rotates, it closes or separates from the aforementioned stationary contact, thereby realizing the closing or opening of the switch.

[0027] In this embodiment, the aforementioned arc-extinguishing chamber 1 has a split structure, that is, the aforementioned arc-extinguishing chamber 1 includes an arc-extinguishing chamber body and an anti-free ionization component located above the arc-extinguishing chamber body, and the two are set separately.

[0028] Please see Figures 2 to 3 The aforementioned arc-extinguishing chamber 1 includes a side wall 11, a gas generating element 12, a moving arc-inducing plate 13, and a grid plate 14. There is a pair of the aforementioned side walls 11, and multiple of the aforementioned grid plates 14 are arranged in an array between the pair of side walls 11. There is a pair of the aforementioned gas generating elements 12 located inside the arc-extinguishing chamber 1, that is, the pair of gas generating elements 12 are respectively connected to the side wall 11 and wrap around the grid plate legs of the aforementioned grid plate 14. The pair of gas generating elements 12 are spaced apart to form an arc channel. The aforementioned contact system includes a moving contact 2, which includes a long contact piece 21 that extends into the aforementioned arc channel. The aforementioned moving arc-inducing plate 13 is arranged on one side corresponding to the moving contact 2.

[0029] The aforementioned gas-generating component 12 is typically made of insulating gas-generating materials such as polyvinyl alcohol, triethanolamine oleate, nylon, melamine, POM, or other equivalent materials.

[0030] See you later Figure 2 and Figure 3 And combined Figure 1 The key technical point of the technical solution provided by this utility model is as follows: a gas receiving cavity 100 is provided between the aforementioned pair of gas generating elements 12 and below the aforementioned moving arc-inducing plate 13. The gas receiving cavity 100 faces the side of the aforementioned long contact plate 21 (e.g., Figure 3 The left side of the position shown is open, while the other three sides form an enclosed state, that is, the longitudinal cross-section is roughly spoon-shaped (that is, a structure that is longitudinally divided into half a mouth shape).

[0031] The structure of the moving contact 2 in the aforementioned contact system also includes a short contact piece 22, which is located outside the aforementioned arc channel and also outside the aforementioned arc extinguishing chamber 1.

[0032] Please see Figures 4 to 5 And combined Figures 2 to 3 Since an arc channel is formed between a pair of gas-generating elements 12, the arc generated when the aforementioned moving contact 2 and the aforementioned stationary contact separates enters the cutting area of ​​the aforementioned grid plate 14 through the arc channel and is extinguished in the cutting area.

[0033] The aforementioned moving arc-drawing piece 13 is disposed on one side of the aforementioned moving contact 2, while the aforementioned stationary arc-drawing piece corresponding to the aforementioned stationary contact is usually mounted on the aforementioned stationary contact.

[0034] Depend on Figure 4 As shown, the aforementioned arc-extinguishing chamber 1 also includes a magnetizing block mounting boss 15, which is disposed between the aforementioned pair of gas generating elements 12, and the magnetizing block mounting boss 15 is located on the side of the aforementioned moving arc-inducing plate 13 away from the arc inlet of the aforementioned arc-extinguishing chamber 1; the aforementioned gas containing cavity 100 is located below the aforementioned magnetizing block mounting boss 15.

[0035] The aforementioned magnetizing block mounting boss 15 is shaped like a dam forming a magnetizing block receiving cavity 151, and a magnetizing block 1511, whose shape and size match the magnetizing block receiving cavity 151, is disposed within the magnetizing block receiving cavity 151. Since the magnetizing block mounting boss 15 is disposed between a pair of gas generating elements 12 and is located on the side of the aforementioned moving arc ignition plate 13 away from the arc inlet and forms a dam, the magnetizing block 1511 disposed therein can be protected from the erosion of the arc gas.

[0036] At least one magnetizing block defining flange 1512 is formed on the bottom wall of the aforementioned magnetizing block receiving cavity 151 and on the side facing the aforementioned magnetizing block 1511. A magnetizing block defining flange fitting hole 15111 is formed on the magnetizing block 1511 and at a position corresponding to the magnetizing block defining flange 1512. The magnetizing block defining flange fitting hole 15111 and the magnetizing block defining flange 1512 are inserted and engaged.

[0037] In this embodiment, the aforementioned magnetizing block 1511 is made of magnet steel, that is, the magnetizing block 1511 is magnet steel.

[0038] Please see Figure 4 and Figure 5 The aforementioned moving arc-inducing plate 13 includes a lower end plate 131, an upper end plate 132, and a connecting plate 133. The lower end plate 131 is located at the end of the connecting plate 133 that extends downward, while the upper end plate 132 is located at the end of the connecting plate 133 that extends toward the arc-extinguishing chamber 1.

[0039] As shown in the figure, the upper end plate 132 of the aforementioned moving arc plate 13 is located outside one end of the array grid plate 14, the aforementioned connecting plate 133 extends to one side around the aforementioned magnetizing block mounting boss 15, and the aforementioned lower end plate 131 is located below the aforementioned magnetizing block mounting boss 15.

[0040] The aforementioned pair of gas generating components 12 includes a left gas generating component 121 and a right gas generating component 122. A first insertion groove 1211 is formed on the left gas generating component 121 and between the aforementioned gas containing cavity 100 and the aforementioned magnetizing block mounting boss 15. A second insertion groove 1221 is provided on the right gas generating component 122. An extension edge 1311 extends from each side of the aforementioned lower end plate 131. The extension edge 1311 is respectively fitted into the aforementioned first insertion groove 1211 and second insertion groove 1221.

[0041] An extension area 200 is formed in the area between the aforementioned pair of gas generating elements 12 and below the aforementioned moving arc ignition plate 13, thereby increasing the spacing width of the area, and the aforementioned gas receiving cavity 100 is located within the aforementioned extension area 200.

[0042] Because the connecting plate 133 has multiple bends, it can cooperate with the static arc-drawing plate to form the arc-extinguishing chamber 1.

[0043] In this embodiment, the aforementioned magnetizing block mounting boss 15 is disposed on the aforementioned left gas generating member 121. Of course, the aforementioned magnetizing block mounting boss 15 can also be disposed on the right gas generating member 122. Alternatively, a portion (e.g., one-half) of the aforementioned magnetizing block mounting boss 15 can be disposed on the left gas generating member 121, and a portion (e.g., the other half) can be disposed on the right gas generating member 122, with the two portions joined together to form the completed magnetizing block mounting boss 15.

[0044] Depend on Figure 3 As shown, the gas-containing cavity 100 disposed between the aforementioned pair of gas-generating components 12 is formed by the first cavity wall 101, the second cavity wall 102 and the third cavity wall 103. The second cavity wall 102 is a longitudinal cavity wall and is connected to the horizontal first cavity wall 101 and the third cavity wall 103.

[0045] Since a gas-containing cavity 100 is provided between a pair of gas-generating elements 12, and the gas-containing cavity 100 is surrounded on three sides with one side of its opening facing the moving contact 2, the arc gas is contained by the gas-containing cavity 100 during the opening of the moving contact 2, preventing the arc gas below the aforementioned moving arc-initiating plate 13 from overflowing downwards, thereby preventing the occurrence of downward breakdown and improving the airtightness of the aforementioned arc-extinguishing chamber 1.

[0046] Please see Figure 6 , Figure 6 The structure of the aforementioned moving contact 2 includes a long contact 21 and a short contact 22. Since the long contact 21 has a longer extension length than the short contact 22, the long contact 21 extends into the aforementioned arc channel, while the short contact 22 is located outside the arc channel and outside the aforementioned arc-extinguishing chamber 1.

[0047] The above structure can effectively prevent the arc gas from moving downward from the space away from the stationary contact of the long contact 21 and contacting the short contact 22, thereby preventing the short contact 22 from being broken down.

[0048] In summary, the arc-extinguishing system of the switch provided by this utility model forms a gas-containing cavity 100 surrounded on three sides below the moving arc-initiating plate 13 and between a pair of gas-generating elements 12. The gas-containing cavity 100 can prevent the arc from overflowing from behind the moving contact plate first, reduce the overflow of arc gas from the arc-extinguishing chamber 1 and its contact with the short contact plate 22, thereby preventing breakdown at the short contact plate 22 and ensuring the airtightness of the arc-extinguishing chamber 1.

Claims

1. A contact arc extinguishing system of a switch, comprising an arc chamber (1) and a contact system, the arc chamber (1) comprising side walls (11), gas generating members (12), a moving arc striking piece (13) and a plurality of grid pieces (14), the plurality of grid pieces (14) being arranged in an array between a pair of side walls (11), a pair of gas generating members (12) being spaced to form an arc passage, the contact system comprising a moving contact (2) comprising a long contact piece (21) which projects into the arc passage, the moving arc striking piece (13) being arranged corresponding to one side of the moving contact (2), characterized in that: A gas containing cavity (100) is arranged between the pair of gas generating members (12) and below the arc leading piece (13), which is open to one side of the long contact piece (21) and is enclosed on the other three sides.

2. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The structure of the movable contact (2) of the contact system further comprises a short contact piece (22), which is located outside the arc passage and also outside the arc chamber (1).

3. An arc quenching system for contacts of a switch according to claim 1 or 2, characterized in that: The arc chamber (1) further comprises a magnetic block mounting boss (15), which is arranged between the pair of gas generating members (12) and is located on the side of the arc leading piece (13) away from the arc inlet of the arc chamber (1); the gas containing cavity (100) is located below the magnetic block mounting boss (15).

4. An arc quenching system for contacts of a switch according to claim 3, characterized in that: The magnetic block mounting boss (15) is in the shape of a cofferdam with a magnetic block containing cavity (151), and a magnetic block (1511) with a shape and size matching the magnetic block containing cavity (151) is arranged in the magnetic block containing cavity (151).

5. An arc quenching system for contacts of a switch according to claim 4, characterized in that: At least one magnetic block limiting flange (1512) is formed on the bottom wall of the magnetic block containing cavity (151) and towards the side of the magnetic block (1511), and a magnetic block limiting flange fitting hole (15111) is formed on the magnetic block (1511) and at a position corresponding to the magnetic block limiting flange (1512), which positions the magnetic block (1511) in the magnetic block containing cavity (151) through the mortise and tenon joint of the magnetic block limiting flange fitting hole (15111) and the magnetic block limiting flange.

6. An arc quenching system for contacts of a switch according to claim 4 or 5, characterized in that: The magnetic block (1511) is composed of a magnetic steel.

7. An arc quenching system for contacts of a switch according to claim 3, characterized in that: The gas containing cavity (100) is composed of a first cavity wall (101), a second cavity wall (102) and a third cavity wall (103), wherein the second cavity wall (102) is a longitudinal cavity wall and connects the horizontal first cavity wall (101) and the third cavity wall (103).

8. An arc quenching system for contacts of a switch according to claim 3, characterized in that: The arc leading piece (13) comprises a lower end plate (131), an upper end plate (132) and a connecting plate (133), the lower end plate (131) is located at the end of the downward extension of the connecting plate (133), and the upper end plate (132) is located at the upper end of the connecting plate (133) extending towards the arc chamber (1).

9. An arc quenching system for contacts of a switch according to claim 8, characterized in that: The pair of gas generating members (12) comprises a left gas generating member (121) and a right gas generating member (122), a first insertion slot (1211) is formed on the left gas generating member (121) between the gas containing cavity (100) and the magnetic block mounting boss (15), and a second insertion slot (1221) is provided on the right gas generating member (122), an expansion edge (1311) extends on both sides of the lower end plate (131), which respectively fits with the first insertion slot (1211) and the second insertion slot (1221).

10. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The region between the pair of gas generating members (12) and below the moving arc plate (13) is provided with an expansion region (200), which increases the spacing width between the expansion region (200) and the gas generating members (12). The gas containing chamber (100) is located in the expansion region (200).

Images