Contact arc extinguishing device of switch
By setting a sealing structure inside the contact cover of the switch, the problem of breakdown caused by arc gas leakage is solved, the arc gas is effectively sealed, and the safety and reliability of the switch are improved.
Patent Information
- Application Number
- CN202423322730.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the existing moving contact structure of switches, arc gas can leak out from the gaps around the moving contact piece, contacting the conductor below and causing breakdown. Existing technology is not able to effectively prevent this problem.
The contact cover employs a sealing structure inside, including first and second mating parts that seal with the pivoting part of the moving contact piece, to prevent arc gas from flowing out of the contact cover and contacting the conductor below.
It effectively prevents arc gas from flowing out of the contact cover, avoiding breakdown and improving the safety and reliability of the switch.
Smart Images
Figure CN223679951U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to low voltage electrical apparatus technical field, more particularly in a kind of contact arc extinguishing device of switch. BACKGROUND
[0002] Switch as important low voltage electrical apparatus, its realization is to the current control of bearing, to meet the management to power supply network.Especially in the development of new energy today, the characteristics of switch are particularly important, to adapt to the characteristics of new energy needs frequently switching circuit on-off.
[0003] The existing movable contact structure adopts the form of long and short movable contact pieces, wherein the second movable contact piece is used to bear the current passing through when the switch is closed, and the first movable contact piece is used to bear the current and arc, so that the arc is completed by the first movable contact piece. This setting, the arc position is located inside the arc extinguishing chamber, which is beneficial to the extinction of the arc. However, due to the ionized gas containing metal vapor generated when the arc occurs, the ionized gas will overflow from the gap around the movable contact piece to the conductor below the movable contact piece, such as the conductive flexible connection, and contact the conductor, thereby causing breakdown. This problem is also a technical problem that needs to be solved by ordinary skilled in the art. SUMMARY
[0004] The task of the present application is to provide a contact arc extinguishing device of switch, which prevents the arc gas from flowing from the inside of the contact cover and contacting the conductor below to prevent breakdown by the sealing structure inside the contact cover.
[0005] The task of the present application is accomplished in this way, a contact arc extinguishing device of switch, comprising a movable contact, a static contact and an arc extinguishing chamber, the movable contact comprises a movable contact piece, a contact cover and a contact support, the movable contact piece is rotatably arranged on the contact support, the contact cover is fixedly installed on the contact support, the movable contact piece comprises a first movable contact piece, the first movable contact piece penetrates the inside of the contact cover and extends upward, the first movable contact piece has a pivot hole and a pivot portion around the pivot hole, the inside of the contact cover has a sealing structure cooperating with the outer edge of the pivot portion.
[0006] In one specific embodiment of the present application, the sealing structure comprises a first cooperating portion, which sealingly cooperates with the front side outer edge of the pivot portion.
[0007] In another specific embodiment of the present application, the sealing structure further comprises a second cooperating portion, which sealingly cooperates with the rear side outer edge of the pivot portion.
[0008] In still another specific embodiment of the present application, the arc extinguishing chamber comprises a pair of gas generating members, and an arc passage is formed between the pair of gas generating members, the movable contact further comprises a second movable contact, the first movable contact extends into the arc passage, and the second movable contact is located outside the contact cover and outside the arc passage.
[0009] In yet another specific embodiment of the present application, the contact cover has a protrusion extending towards the arc extinguishing chamber, and the pair of gas generating members extend downwards and separate the first movable contact located inside the protrusion from the second movable contact located outside the protrusion.
[0010] In still another specific embodiment of the present application, the contact cover further comprises a base body, the protrusion extends from the base body towards the arc extinguishing chamber, the base body is a hollow shell structure, the sealing structure comprises a first fitting part in sealing fit with the front side outer edge of the pivot part, and the first fitting part is located between a pair of side walls of the base body.
[0011] In yet another specific embodiment of the present application, the sealing structure further comprises a second fitting part in sealing fit with the rear side outer edge of the pivot part, and the second fitting part is located on the contact support.
[0012] In still another specific embodiment of the present application, the sealing structure further comprises a second fitting part in sealing fit with the rear side outer edge of the pivot part, the second fitting part is arranged on the contact cover, and the second fitting part is located between a pair of side walls of the base body.
[0013] In yet another specific embodiment of the present application, the contact support further comprises a fitting cavity for matching the shape of the contact cover on the side close to the contact support, and a fixed mounting part is arranged on the side of the contact cover close to the contact support; a fixing hole and a boss are further arranged on the fitting cavity, the fixing hole corresponds to the mounting hole on the fixed mounting part, and the boss is embedded into the contact cover.
[0014] In still another specific embodiment of the present application, the contact cover has a pair of hook groove parts on both sides of the protrusion, the pair of hook groove parts are located below both sides of the protrusion, and the extending side of the gas generating member falls into the hook groove parts on both sides of the protrusion.
[0015] In still another specific embodiment of the present application, a stepped surface is arranged on the inner side of the gas generating member and in contact with both sides of the protrusion.
[0016] The present invention has the following advantages due to the above-mentioned structure: it prevents arc gas from flowing through the inside of the contact cover and contacting the conductor below by using a sealing structure inside the contact cover, thereby preventing breakdown. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the arc-extinguishing chamber described in this invention;
[0018] Figure 2 This is a schematic diagram of the structure of the moving contact described in this invention;
[0019] Figure 3 This is a schematic diagram of the structure of the stationary contact described in this invention;
[0020] Figure 4 This is a three-dimensional schematic diagram of the contact cover described in this invention;
[0021] Figure 5 This is a front view of the contact cover described in this invention;
[0022] Figure 6 This is a side sectional view of the contact cover described in this invention;
[0023] Figure 7 This is a schematic diagram of the structure of the contact cover and the first moving contact piece according to the present invention.
[0024] Figure 8 This is a schematic diagram of the contact support structure described in this invention;
[0025] Figure 9 This is a schematic diagram of the structure of the contact cover and the arc-extinguishing chamber according to the present invention.
[0026] In the diagram: 1. Moving contact, 11. Moving contact piece, 111. First moving contact piece, 1111. Moving arc contact, 1112. Pivot part, 1113. Pivot hole, 112. Second moving contact piece, 1121. Moving main contact, 12. Contact cover, 121. Base, 122. Raised part, 1221. Opening, 1222. Baffle part, 123. Groove part, 124. Fixed mounting part, 1241. Mounting hole, 125. First mating part, 13. Contact support. 131. Second mating part; 132. Partition wall; 133. Mating cavity; 1331. Fixing hole; 1332. Boss; 134. Slot; 14. Side plate; 15. Outgoing busbar; 16. Contact spring; 2. Stationary contact; 21. Conductive block; 211. Opening slot; 212. Notch; 213. Abutting slot; 22. Stationary main contact; 23. Stationary arc contact; 24. Arc ignition plate; 3. Arc extinguishing chamber; 31. Gas generating component; 311. Stepped surface; 100. Relief slot. Detailed Implementation
[0027] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings, but the description of the embodiments is not a limitation of the technical solutions, and any formal but not substantial changes according to the concept of the present application should be considered as the protection scope of the present application.
[0028] In the following description, the directional or positional concepts of up, down, left, right, front and back are based on the positions shown in the corresponding drawings, which are only provided for the convenience of describing the technical solutions and simplifying the description of the present application, and therefore should not be understood as a special limitation of the technical solutions provided by the present application.
[0029] As Figure 1 , the contact arc extinguishing device of the switch comprises a moving contact 1, a stationary contact 2 and an arc extinguishing chamber 3, wherein the moving contact 1 and the stationary contact 2 form a contact system, and the arc extinguishing chamber 3 is located above the contact system. When the switch is broken, the moving contact 1 and the stationary contact 2 will generate an arc when they are separated, and the arc will enter the arc extinguishing chamber 3 and be extinguished in the arc extinguishing chamber 3.
[0030] As the name implies, the moving contact 1 is rotatably arranged, and the stationary contact 2 is fixedly arranged. The moving contact 1 is rotated to realize the closing or separation with the stationary contact 2, thereby realizing the closing or opening action of the switch.
[0031] Specifically, the switch further comprises a housing, an inner cavity is formed in the housing, the moving contact 1 and the stationary contact 2 are located in the inner cavity, and the inner cavity is open upward, and the arc extinguishing chamber 3 is installed at the upward opening.
[0032] As Figure 2 In combination Figure 8 , a schematic view of the moving contact 1 is shown. The moving contact 1 comprises a moving contact piece 11, a contact cover 12, a contact support 13, a side plate 14 and an outgoing busbar 15. The moving contact piece 11 is rotatably arranged between a pair of side plates 14 through a rotating shaft, the rotating shaft passes through the moving contact piece 11 and the contact cover 12 at the same time, and the pair of side plates 14 are fixedly installed on both sides of the contact support 13. The above installation relationship makes the moving contact piece 11 and the contact support 13 in a rotatable installation relationship. The outgoing busbar 15 is located on one side of the rotating center of the moving contact 1, and the contact support 13 is also located on the other side of the rotating center. The outgoing busbar 15 is fixed on the housing of the switch. The moving contact piece 11 rotates with the contact support 13, but the moving contact piece 11 can also rotate relative to the contact support 13. The moving contact piece 11 and the outgoing busbar 15 are electrically connected through a soft connection (not shown).
[0033] The moving contact 11 comprises a first moving contact 111 and a second moving contact 112. The first moving contact 111 has a greater extension length relative to the second moving contact 112. When the moving contact 1 and the arc extinguishing chamber 3 are both installed in place, the head of the first moving contact 111 penetrates into the interior of the arc extinguishing chamber 3, and the second moving contact 112 is located outside the arc extinguishing chamber 3.
[0034] The first moving contact 111 is provided with a moving arc contact 1111, and the second moving contact 112 is provided with a moving main contact 1121. The moving arc contact 1111 follows the head of the first moving contact 111 and is located in the interior of the arc extinguishing chamber 3, and the moving main contact 1121 follows the second moving contact 112 and is located outside the arc extinguishing chamber 3. The head of the first moving contact 111 is arranged to penetrate the grid in the arc extinguishing chamber 3.
[0035] The contact cover 12 is fixed on the contact support 13, and the contact cover 12 is sleeved on the first moving contact 111, and it can also be understood that the contact cover 12 only corresponds to the first moving contact 111. The first moving contact 111 penetrates the interior of the contact cover 12 and extends upward. In this embodiment, the first moving contact 111 is composed of two groups in the middle, and the second moving contact 112 is divided into two sides, respectively located on the left and right sides of a group of first moving contacts 111. The two side walls of the contact cover 12 separate the first moving contact 111 and the second moving contact 112 within the range of the side wall.
[0036] As Figure 3 , the static contact 2 comprises a conductive block 21, a static main contact 22 and a static arc contact 23 are installed on the side of the conductive block 21 close to the moving contact 1, the static arc contact 23 is located between a pair of static main contacts 22, and the three contacts are arranged in a "pin" shape. The static main contact 22 is used for corresponding cooperation with the moving main contact 1121, and the static arc contact 23 is used for corresponding cooperation with the moving arc contact 1111. The conductive block 21 is provided with an arc leading piece 24 close to the arc extinguishing chamber 3, and the arc leading piece 24 extends towards the arc extinguishing chamber 3.
[0037] A pair of open grooves 211 are provided on the conductive block 21, which open from above the conductive block 21 and extend downward, and the lower ends of the open grooves 211 are closed. The open grooves 211 separate the static arc contact 23 from the portions of the conductive blocks 21 on both sides. When the moving contact 1 separates from the static contact 2 to generate an arc, the current on the side of the static contact 2 needs to bypass the open grooves 211 to reach the static arc contact 23 from below. The electric repulsion force generated by the current path is more conducive to the upward movement of the arc.
[0038] A gap 212 is provided on the lower side of the conductive block 21, which allows the contact cover 12 to pass through. Since the contact cover 12 is installed on the contact support 13 and extends in the direction of the static contact 2, the gap 212 and the corresponding passing groove 100 on the housing jointly allow the position space of the contact cover 12 during the movement of the moving contact 1, without affecting the rotation or swing of the contact cover 12.
[0039] A pair of abutting grooves 213 are provided on the conductive block 21 inside the pair of open grooves 211, which are located on the outer sides of the static arc contact 23 and are used for abutting cooperation with the arc extinguishing chamber 3.
[0040] As Figure 4 , Figure 5 , Figure 6 is a schematic view of the contact cover 12. The contact cover 12 is made of insulating material, preferably thermosetting material, such as DMC or BMC.
[0041] The contact cover 12 includes a base body 121, which has a raised portion 122 above the base body 121, i.e. in the direction of the arc extinguishing chamber 3, and has hook groove portions 123 on both sides of the raised portion 122. The hook groove portions 123 are a pair, respectively located on both sides of the raised portion 122. Preferably, the hook groove portions 123 are located below the raised portion 122 on both sides.
[0042] The contact cover 12 also has a fixed mounting portion 124 on the side close to the contact support 13. The contact cover 12 is mounted on the contact support 13 through the fixed mounting portion 124, specifically on the side surface of the contact support 13 close to the static contact 2. More preferably, the fixed mounting portion 124 is provided with a mounting hole 1241, a screw presses the fixed mounting portion 124, the head of the screw protrudes through the mounting hole 1241 and is inserted into the contact support 13, thereby achieving the fixed mounting of the contact cover 12 and the contact support 13.
[0043] The protruding part 122 has an opening 1221 on one side of the first movable contact 111, and a baffle part 1222 on both sides of the opening 1221, the opening 1221 is used to accommodate the first movable contact 111, and the baffle part 1222 is on both sides of the first movable contact 111. In this embodiment, the first movable contact 111 is two, at this time, the two first movable contacts 111 form a group, and are located in the opening 1221, and a pair of baffle parts 1222 are located on both sides of the group of first movable contacts 111.
[0044] Since the contact cover 12 is made of an insulating material, preferably a thermosetting material or a thermoplastic material, and is hollow inside, it is convenient to manufacture. On this basis, the base 121 is a hollow shell structure. Between the pair of side walls of the base 121 is a first matching part 125, which is in the form of a rib between the pair of side walls of the base 121, and the first matching part 125 matches the first movable contact 111. The base 121 has a rotating hole for the rotating shaft of the movable contact 11 to pass through.
[0045] As Figure 7 is a side view of the movable contact 1. The first movable contact 111 includes a movable arc contact 1111 mounted on the rotating end. The first movable contact 111 also includes a pivot part 1112 and a pivot hole 1113, the pivot part 1112 is located around the pivot hole 1113 and surrounds the pivot hole 1113 in the form of a coffer. In combination with the structure of the long plate body of the first movable contact 111, the pivot part 1112 has a circular arc-shaped outer edge on the side close to the stationary contact 2 and the side away from the stationary contact 2, i.e. the front and back of the first movable contact 111.
[0046] As can be seen from the figure, the movable contact 1 also includes a contact spring 16, which is inserted into the spring cavity in the contact support 13, one end of the contact spring 16 abuts against the contact support 13, and the other end abuts against the first movable contact 111. Of course, since the second movable contact 112 is not shown in the figure, it also has the contact spring 16 matched therewith, which is used to provide contact pressure for the second movable contact 112.
[0047] In combination with Figure 8The contact support 13 comprises a second matching part 131 which is in sealing matching with the rear side outer edge of the pivot part 1112, while the first matching part 125 on the contact cover 12 is in sealing matching with the front side outer edge of the pivot part 1112. In the direction, the front side refers to the side close to the static contact 2, while the rear side refers to the side far away from the static contact 2. In the present application, the sealing matching refers to that the shapes of the first matching part 125 and the second matching part 131 are matched with the outer edge of the pivot part 1112, and the sealing matching ensures that the two parts are in contact or have small gap. In this way, the gas is blocked from moving downward through the sealing matching of the two parts, and the arc gas is prevented from contacting the lower conductor, such as the conductive flexible connection, through the sealing matching of the two parts. The second matching part 131 can also be arranged on the contact cover 12, and preferably, the second matching part 131 is located between the pair of side walls of the base 121, so that better matching effect can be achieved. The first matching part 125 and the second matching part 131 are both located inside the contact cover 12.
[0048] The contact support 13 further comprises a partition wall 132, a matching cavity 133 and a slot 134. When the movable contact 1 is installed, the partition wall 132 is inserted between the movable contact pieces 11. In the present embodiment, the first movable contact piece 111 is composed of two pieces, and similarly, the second movable contact piece 112 is also separated by the partition wall 132 every two pieces. The matching cavity 133 is used to match the shape of the contact cover 12 close to the side of the contact support 13, so as to ensure the positioning effect of the two parts during installation. The matching cavity 133 is further provided with a fixing hole 1331 and a boss 1332. The fixing hole 1331 corresponds to the mounting hole 1241 on the fixed mounting part 124, so as to facilitate the screw fixing installation. The boss 1332 is embedded in the contact cover 12, so as to facilitate the installation and positioning of the contact cover 12 and the contact support 13.
[0049] The slot 134 is a pair of slots and is arranged in a spaced manner. The slot 134 extends downward from the rotating end of the contact support 13. When the movable contact 1 is installed, the first movable contact piece 111 is located between the pair of slots 134, and the second movable contact piece 112 is located on the left and right outer sides of the pair of slots 134.
[0050] As Figure 9The arc extinguishing chamber 3 comprises a grid (not shown) installed inside, and the grid has a pair of grid legs extending downward on both sides. The gas generating members 31 are also a pair, and a pair of gas generating members 31 are arranged between a pair of grid legs, and a pair of gas generating members 31 are arranged at intervals to form an arc passage or a narrow gap therebetween. The head of the first moving contact 111 extends over the grid legs in the height direction. A pair of gas generating members 31 extend downward, that is, extend toward the contact system, and the gas generating members 31 are inserted into the insertion slot 134 on the side close to the moving contact 1, and during the entire movement of the moving contact 1, the insertion cooperation between the gas generating members 31 and the insertion slot 134 is established, and there is no disengagement. On the side of the gas generating members 31 close to the stationary contact 2, the gas generating members 31 abut against the abutment groove 213 on the conductive block 21. The gas generating members 31 correspond to the part of the contact cover 12, extend downward from both sides of the raised portion 122, so that the cooperation of the gas generating members 31 and the raised portion 122 can better block the downward movement of the arc gas. The extended side of the gas generating members 31 falls into the hook groove portion 123 on both sides of the raised portion 122. More preferably, in order to further improve the gas sealing effect between the gas generating members 13 and the raised portion 122, a stepped surface 311 is arranged on the inner side of the gas generating members 31 and in contact with the two sides of the raised portion 122. This matching structure has better gas blocking effect.
Claims
1. A contact arc-extinguishing device for a switch, comprising a moving contact (1), a stationary contact (2), and an arc-extinguishing chamber (3), wherein the moving contact (1) comprises a moving contact piece (11), a contact cover (12), and a contact support (13), the moving contact piece (11) being rotatably mounted on the contact support (13), the contact cover (12) being fixedly mounted on the contact support (13), and the moving contact piece (11) comprising a first moving contact piece (111); characterized in that: The first movable contact (111) extends into the inside of the contact cover (12) and upwardly, the first movable contact (111) has a pivot hole (1113) and a pivot part (1112) around the pivot hole (1113), the inside of the contact cover (12) has a sealing structure matched with the outer edge of the pivot part (1112).
2. An arc extinguishing device for contacts of a switch according to claim 1, characterized in that: The sealing structure includes a first matched part (125) matched with the front side outer edge of the pivot part (1112).
3. An arc extinguishing device for contacts of a switch according to claim 2, characterized in that: The sealing structure also includes a second matched part (131) matched with the rear side outer edge of the pivot part (1112).
4. An arc extinguishing device for contacts of a switch according to claim 1, characterized in that: The arc extinguishing chamber (3) includes a pair of gas generating parts (31) forming an arc channel therebetween, the movable contact (11) also includes a second movable contact (112), the first movable contact (111) extends into the arc channel, and the second movable contact (112) is located outside the contact cover (12) and outside the arc channel.
5. An arc extinguishing device for contacts of a switch according to claim 4, characterized in that: The contact cover (12) has a raised part (122) extending toward the arc extinguishing chamber (3), the pair of gas generating parts (31) extend downwardly and isolate the first movable contact (111) inside the raised part (122) from the second movable contact (112) outside the raised part (122).
6. An arc extinguishing device for contacts of a switch according to claim 5, characterized in that: The contact cover (12) also includes a base body (121), the raised part (122) extends from the base body (121) toward the arc extinguishing chamber (3), the base body (121) is a hollow shell structure, the sealing structure includes a first matched part (125) matched with the front side outer edge of the pivot part (1112), and the first matched part (125) is located between a pair of side walls of the base body (121).
7. An arc extinguishing device for contacts of a switch according to claim 6, characterized in that: The sealing structure also includes a second matched part (131) matched with the rear side outer edge of the pivot part (1112), and the second matched part (131) is located on the contact support (13).
8. An arc extinguishing device for contacts of a switch according to claim 6, characterized in that: The sealing structure also includes a second matched part (131) matched with the rear side outer edge of the pivot part (1112), and the second matched part (131) is arranged on the contact cover (12), and the second matched part (131) is located between a pair of side walls of the base body (121). The sealing structure also includes a second matched part (131) matched with the rear side outer edge of the pivot part (1112), and the second matched part (131) is arranged on the contact cover (12), and the second matched part (131) is located between a pair of side walls of the base body (121).
9. An arc extinguishing device for contacts of a switch according to claim 1, characterized in that: The contact support (13) further comprises a matching cavity (133) for matching the outer shape of the contact cover (12) on the side close to the contact support (13), and a fixed mounting portion (124) is further arranged on the side of the contact cover (12) close to the contact support (13); a fixing hole (1331) and a boss (1332) are further arranged on the matching cavity (133), the fixing hole (1331) corresponds to a mounting hole (1241) on the fixed mounting portion (124), and the boss (1332) is embedded into the contact cover (12).
10. An arc extinguishing device for contacts of a switch according to claim 5, characterized in that: The contact cover (12) has a pair of hook groove portions (123) on both sides of the raised portion (122), the pair of hook groove portions (123) are arranged below both sides of the raised portion (122), and the extended side of the gas generating member (31) falls into the hook groove portions (123) on both sides of the raised portion (122).
11. An arc extinguishing device for contacts of a switch according to claim 10, characterized in that: A stepped surface (311) is arranged on the inner side of the gas generating member (31) and in contact with the both sides of the raised portion (122).