Switch unit and isolating switch

Abstract

A switch unit and an isolation switch relate to the low-voltage electrical technology field. The switch unit comprises a shell, a moving contact support, a moving contact and a static contact, the moving contact and the static contact are matched with each other, the moving contact is arranged in the moving contact support, at least part of the moving contact extends out of the moving contact support from the side wall of the moving contact support, and the moving contact is rotationally arranged in the shell through the moving contact support; the static contact is fixedly arranged in the shell; the shell is internally provided with an arc extinguishing area and an annular arc channel, the annular arc channel is located on an opening and closing path of the moving contact and the static contact, an arc extinguishing inlet of the arc extinguishing area is communicated with the annular arc channel, and an arc extinguishing outlet of the arc extinguishing area is communicated with the outside of the shell. According to the switch unit, the dredging and extinguishing efficiency of the electric arc is improved, and the heat dissipation effect and the use safety of the switch unit are also improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically, to a switching unit and a disconnecting switch. Background Technology

[0002] In power systems, the switch unit is a key component of the control and protection circuits, and its performance directly affects the safe and stable operation of the power system. In existing switch units, the contact support of the contact assembly is usually fitted to the arc inlet channel of the arc-extinguishing chamber; a narrow slit is opened on the side edge of the contact support, through which the stationary contact can extend into the contact support, and the moving contact rotates along the narrow slit to open or close with the stationary contact.

[0003] Under normal operating conditions, this setup can meet certain usage requirements. However, when the equipment is in special conditions such as high altitude and high temperature, and needs to cut off high DC voltage, the heat dissipation of the existing setup is poor, and the contact support is in close contact with the arc inlet channel of the arc extinguishing chamber, which is not conducive to the conduction and extinguishing of the arc, and may easily lead to safety hazards of burning electrical equipment. Utility Model Content

[0004] The purpose of this invention is to provide a switching unit and a disconnecting switch, which can improve the efficiency of arc conduction and extinguishing, and improve the heat dissipation effect and safety of the switching unit.

[0005] The embodiments of this utility model are implemented as follows:

[0006] In one aspect, this utility model provides a switching unit, including a housing, a moving contact bracket, and a moving contact and a stationary contact that cooperate with each other. The moving contact is disposed within the moving contact bracket and extends at least partially from the side wall of the moving contact bracket to the outside of the moving contact bracket, and is rotatably disposed within the housing via the moving contact bracket. The stationary contact is fixedly disposed within the housing. The housing has an arc-extinguishing region and an annular arc channel. The annular arc channel is located on the opening and closing path of the moving contact and the stationary contact, and the arc-extinguishing inlet of the arc-extinguishing region is connected to the annular arc channel, and the arc-extinguishing outlet of the arc-extinguishing region is connected to the outside of the housing.

[0007] Optionally, the depth of the annular arc channel is greater than or equal to the thickness of the moving contact, and both the depth direction and the thickness direction are in the same direction as the thickness direction of the housing.

[0008] Optionally, the width of the annular arc channel is greater than or equal to the length of the moving contact located outside the moving contact support, and the width direction is perpendicular to the depth direction.

[0009] Optionally, the housing includes an upper shell and a lower shell that interlock with each other, the upper shell and the lower shell forming a receiving cavity, and the moving contact support, the moving contact and the stationary contact are disposed in the receiving cavity; the side of the upper shell facing the lower shell is provided with an upper rib, and the side of the lower shell facing the upper shell is provided with a corresponding lower rib, the upper rib and the lower rib forming an annular arc channel.

[0010] Optionally, the upper rib has an annular structure protruding from the upper shell, and the outer wall of the upper rib is provided with a snap-fit ​​groove; the lower rib has an annular structure protruding from the lower shell, and the periphery of the lower rib is provided with a snap-fit ​​rib, which is located between the arc-extinguishing area and the stationary contact; the snap-fit ​​rib can be snapped into the snap-fit ​​groove so that the upper rib and the lower rib are arranged opposite each other and have a preset interval, and the part of the moving contact extending to the outside of the moving contact support is located between the upper rib and the lower rib.

[0011] Optionally, the switching unit also includes an insulating component that protrudes from the side edge of the moving contact bracket; when the moving contact is in the open position, the insulating component is disposed between the moving contact and the stationary contact along the opening direction of the moving contact.

[0012] Optionally, the length of the insulating element protruding from the moving contact bracket is greater than or equal to the length of the moving contact disposed outside the moving contact bracket.

[0013] Optionally, an arc-extinguishing chamber is provided at the arc-extinguishing inlet of the arc-extinguishing area, and an arc-running track is provided on the side of the arc-extinguishing chamber near the arc-extinguishing outlet. The inlet of the arc-running track is connected to the arc-extinguishing chamber, and the outlet forms the arc-extinguishing outlet.

[0014] Optionally, the arc-running path includes a first arc-running path and a second arc-running path. The first arc-running path is located at one end of the arc-extinguishing chamber near the opening position of the moving contact. The second arc-running path is located at one end of the arc-extinguishing chamber near the arc-starting point of the moving contact and the stationary contact. The arc-starting point is the position where the moving contact begins to open with the stationary contact and generates relative displacement.

[0015] In another aspect, this utility model provides a disconnecting switch, including a handle, an operating mechanism, and multiple stacked switch units. The handle and the operating mechanism are driven to be connected, and the operating mechanism is driven to be connected to the moving contact bracket in each layer of switch units.

[0016] The beneficial effects of this utility model include:

[0017] This application provides a switching unit, including a housing, a moving contact bracket, and a moving contact and a stationary contact that cooperate with each other. The moving contact is disposed within the moving contact bracket and extends at least partially from the side wall of the moving contact bracket to the outside of the moving contact bracket, and is rotatably disposed within the housing via the moving contact bracket. The stationary contact is fixedly disposed within the housing. When the moving contact bracket rotates, the moving contact extending outside the moving contact bracket can be used to close or open with the stationary contact. The housing has an arc-extinguishing area and an annular arc channel. The annular arc channel is located on the opening and closing path of the moving contact and the stationary contact, and the arc-extinguishing inlet of the arc-extinguishing area is connected to the annular arc channel, and the arc-extinguishing outlet of the arc-extinguishing area is connected to the outside of the housing. Compared to existing technologies that use narrow slits on the side edges of the contact support to allow the stationary contact to extend into the support and the moving contact to rotate along the slit to open or close the circuit with the stationary contact, this application, through the design of an annular arc channel, ensures that both the moving and stationary contacts extending outside the moving contact support are always within this channel. This prevents the contact support from coming into contact with the arc-extinguishing inlet of the arc-extinguishing region, allowing the arc to quickly enter the arc-extinguishing region through the annular arc channel. The aforementioned switching unit improves the efficiency of arc conduction and extinguishing, while also enhancing the heat dissipation and operational safety of the switching unit. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of the switching unit provided in the embodiment of this utility model;

[0020] Figure 2 A second schematic diagram of the structure of the switching unit provided in this embodiment of the utility model;

[0021] Figure 3 A schematic diagram of the housing of the switching unit provided in this embodiment of the utility model;

[0022] Figure 4 One of the structural schematic diagrams of the moving contact bracket of the switch unit provided in this embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the arc-extinguishing chamber of the switching unit provided in this embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the stacked structure of multiple switch units provided in an embodiment of the present invention;

[0025] Figure 7 A second schematic diagram of the moving contact bracket of the switch unit provided in this embodiment of the utility model;

[0026] Figure 8 A cross-sectional view of the switching unit provided in an embodiment of this utility model;

[0027] Figure 9 A schematic diagram of the upper shell of the switching unit provided in an embodiment of this utility model;

[0028] Figure 10 This is a schematic diagram of the structure of the disconnecting switch provided in an embodiment of the present utility model.

[0029] Icons: 100-Switch unit; 110-Housing; 111-Upper housing; 1111-Upper rib; 1112-Snap-fit ​​groove; 112-Lower housing; 1121-Lower rib; 1122-Snap-fit ​​rib; 113-Arc extinguishing area; 114-Annular arc channel; 120-Moving contact bracket; 121-Support part; 1211-Opening; 122-Insulator; 130-Moving contact; 131-First clamping part; 132-Second clamping part; 1 40 - Stationary contact; 141 - First stationary contact; 142 - Second stationary contact; 143 - Contact end; 144 - Terminal; 150 - Arc extinguishing chamber; 151 - First fixed plate; 152 - Second fixed plate; 153 - Grid plate; 160 - First arc track; 170 - Second arc track; 200 - Disconnecting switch; 210 - Handle; 220 - Operating mechanism; a - Thickness direction of the housing; b - Length of the moving contact outside the moving contact bracket. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] Please refer to Figure 1 and Figure 3 This embodiment provides a switching unit 100, including a housing 110, a moving contact bracket 120, a moving contact 130 and a stationary contact 140 that cooperate with each other. The moving contact 130 is disposed within the moving contact bracket 120 and extends at least partially from the side wall of the moving contact bracket 120 to the outside of the moving contact bracket 120, and is rotatably disposed within the housing 110 via the moving contact bracket 120. The stationary contact 140 is fixedly disposed within the housing 110. The housing 110 has an arc-extinguishing region 113 and an annular arc channel 114. The annular arc channel 114 is located on the opening and closing path of the moving contact 130 and the stationary contact 140, and the arc-extinguishing inlet of the arc-extinguishing region 113 is connected to the annular arc channel 114, and the arc-extinguishing outlet of the arc-extinguishing region 113 is connected to the outside of the housing 110.

[0037] Specifically, such as Figure 1 and Figure 3As shown, the switching unit 100 includes a housing 110, which has an annular arc channel 114. The moving contact support 120 includes two stacked support portions 121, with an opening 1211 between them. The moving contact 130 is disposed between the two support portions 121, and at least a portion of the moving contact 130 can extend from this opening 1211 to the outside of the support portion 121. The moving contact support 120 is located at the center of the arc-extinguishing region 113 to ensure that the moving contact 130 extending to the outside of the moving contact support 120 is always located within the annular arc channel 114.

[0038] like Figure 1 As shown, the stationary contact 140 is disposed inside the housing 110. The stationary contact 140 has a wiring terminal 144 for wiring with external equipment and a contact terminal 143 for contacting the stationary contact 140 to close the circuit. The contact terminal 143 is located inside the annular arc channel 114, while the wiring terminal 144 is connected to the outside through a wiring port opened on the side wall of the housing 110.

[0039] like Figure 3 As shown, since the contact ends 143 of the moving contact 130 and the stationary contact 140 extending to the outside of the moving contact support 120 are both located within the annular arc channel 114, that is, the annular arc channel 114 is located on the opening and closing path of the moving contact 130 and the stationary contact 140. The housing 110 also has an arc-extinguishing region 113, which has an arc-extinguishing inlet and an arc-extinguishing outlet. The arc-extinguishing inlet is connected to the annular arc channel 114, and the arc-extinguishing outlet is connected to the outside through the side wall of the housing 110.

[0040] When the moving contact 130 and the stationary contact 140 generate an arc during the opening process, the arc first enters the annular arc channel 114. Because the annular arc channel 114 has an annular structure, it can guide the arc along a specific path. The arc guided by the annular arc channel 114 can then enter the arc extinguishing region 113 through the arc extinguishing inlet. Within the arc extinguishing region 113, the arc is extinguished using an arc extinguishing structure. The arc extinguishing outlet of the arc extinguishing region 113 is connected to the outside of the housing 110, allowing the gases and other substances generated after arc extinguishing to be discharged into the external environment, preventing their accumulation within the housing 110 and affecting the normal operation of the switching unit 100.

[0041] It should be noted that, in one possible implementation of this application, firstly, in order to ensure the reliability of arc ignition, the depth of the annular arc channel 114 is greater than or equal to the thickness of the moving contact 130, so as to ensure that the contact end 143 of the moving contact 130 extending to the outside of the moving contact support 120 and the stationary contact 140 can be completely disposed within the annular arc channel 114, wherein the depth direction and the thickness direction are in the same direction as the thickness direction a of the housing.

[0042] Second, to ensure the reliability of arc initiation, please refer to... Figure 1 and Figure 7 The width of the annular arc channel 114 is greater than or equal to the length b of the moving contact located outside the moving contact support, so as to ensure that the contact end 143 of the moving contact 130 extending outside the moving contact support 120 and the stationary contact 140 can be completely located within the annular arc channel 114, while allowing the moving contact 130 extending outside the moving contact support 120 to slide flexibly within the annular arc channel 114, wherein the width direction is perpendicular to the depth direction.

[0043] Third, such as Figure 2 As shown, the moving contact 130 includes two moving contact plates stacked within the moving contact bracket 120. The two moving contact plates are straight strips inserted through the moving contact bracket 120. The opposite ends of the two moving contact plates extend from the side wall of the moving contact bracket 120 to the outside of the moving contact bracket 120, respectively forming a first clamping part 131 and a second clamping part 132. The stationary contact 140 includes a first stationary contact 141 and a second stationary contact 142. When the moving contact 130 rotates to the closed position, the first clamping part 131 can clamp the contact end 143 of the first stationary contact 141, and the second clamping part 132 can clamp the contact end 143 of the second stationary contact 142, thereby forming an electrical path. Correspondingly, the arc extinguishing region 113 also includes two regions, which are respectively provided for the first clamping part 131 and the second clamping part 132.

[0044] Specifically, in this embodiment, the first clamping part 131 and the second clamping part 132 of the moving contact 130 simultaneously contact or separate from the two stationary contacts 140. The closing and opening paths of the first clamping part 131 and the first stationary contact 141 are located within the annular arc channel 114, and the closing and opening paths of the second clamping part 132 and the second stationary contact 142 are also located within the annular arc channel 114. An arc-extinguishing area 113 is provided on each of the opposite sides of the annular arc channel 114, and both arc-extinguishing areas 113 are used to extinguish the arc generated by the opening.

[0045] Fourth, such as Figure 6 As shown, in this embodiment, the housing 110 is formed by fastening an upper housing 111 and a lower housing 112 together. The upper housing 111 and the lower housing 112 fasten together to form a receiving cavity, in which the moving contact support 120, the moving contact 130, and the stationary contact 140 are all located. Figure 6 As shown, when the disconnector 200 includes multiple switch units 100, the multiple switch units 100 are stacked. One side of the housing 110 located in the middle can serve as the lower housing 112 of one of the switch units 100, and the other side can serve as the upper housing 111 of another switch unit 100, so as to reduce the size of the device.

[0046] The arc-extinguishing region 113 and the annular arc channel 114 located within the shell 110 are interval regions defined by the ribs within the shell 110. For example... Figure 8 As shown, in one specific embodiment of this application, the upper shell 111 has an upper rib 1111 on the side facing the lower shell 112, and the lower shell 112 has a corresponding lower rib 1121 on the side facing the upper shell 111. The upper rib 1111 and the lower rib 1121 enclose and form an annular arc channel 114. Specifically, as shown... Figure 9 As shown, the upper rib 1111 has an annular structure protruding from the upper shell 111, and the outer wall of the upper rib 1111 is provided with a snap-fit ​​groove 1112; as Figure 3 As shown, the lower rib 1121 has an annular structure protruding from the lower shell 112. The periphery of the lower rib 1121 is provided with a snap-fit ​​rib 1122, which is located between the arc-extinguishing area 113 and the stationary contact 140. The snap-fit ​​rib 1122 can be snapped into the snap-fit ​​groove 1112 so that the upper rib 1111 and the lower rib 1121 are arranged opposite each other and have a preset interval. The part of the moving contact 130 extending to the outside of the moving contact support 120 is located between the upper rib 1111 and the lower rib 1121.

[0047] In another specific embodiment of this application, the ribs may also be disposed on the side plate of the arc-extinguishing chamber 150 located within the arc-extinguishing area 113. This application does not impose any restrictions on the specific arrangement of the ribs, as long as they can achieve the isolation and division of different functional areas of the arc-extinguishing area 113 and the annular arc channel 114 within the housing 110.

[0048] Compared to existing technologies that use narrow slits on the side edges of the contact support to allow the stationary contact to extend into the support and the moving contact to rotate along the slit to open or close with the stationary contact, this application, through the annular arc channel 114, ensures that the moving contact 130 and the stationary contact 140 extending outside the moving contact bracket 120 are always located within the annular arc channel 114. This avoids contact between the support 121 and the arc-extinguishing inlet of the arc-extinguishing region 113, allowing the arc to quickly enter the arc-extinguishing region 113 through the annular arc channel 114. The aforementioned switching unit 100 improves the efficiency of arc conduction and extinguishing, while also enhancing the heat dissipation and operational safety of the switching unit 100.

[0049] For example, such as Figure 1 , Figure 2 and Figure 4 As shown, the switch unit 100 also includes an insulating member 122, which protrudes from the side edge of the moving contact bracket 120. When the moving contact 130 is in the open position, the insulating member 122 is disposed between the moving contact 130 and the stationary contact 140 along the opening direction of the moving contact 130.

[0050] Specifically, such as Figure 4As shown, in this embodiment, the switching unit 100 is further provided with an insulating member 122, which is disposed on at least one support portion 121 of the moving contact bracket 120 and protrudes from one side of the opening 1211 of the two support portions 121.

[0051] like Figure 1 and Figure 2 As shown, when the first clamping part 131 is in the open position, the circuit is disconnected. The insulating member 122 is precisely located between the first clamping part 131 and the second stationary contact 142, effectively preventing electrical breakdown and arc discharge that may occur between them. This ensures reliable insulation of the circuit in the open state and avoids safety accidents or equipment failures caused by accidental electrical conduction. Similarly, when the second clamping part 132 is in the open position, the insulating member 122 is precisely located between the second clamping part 132 and the first stationary contact 141, playing the same insulating and isolating role. This ensures the insulation performance and operational stability of the switching unit 100 under different open contact 130 conditions, providing a guarantee for the safe and reliable operation of the entire power system.

[0052] It should be noted that, in one possible embodiment of this application, firstly, the length of the insulating member 122 protruding from the moving contact bracket 120 is greater than or equal to the length of the moving contact 130 disposed outside the moving contact bracket 120. Due to the guarantee of the protruding length of the insulating member 122, it is ensured that the insulating member 122 can effectively perform its insulating function throughout the entire stroke range of the moving contact 130.

[0053] Secondly, this application does not impose any restrictions on the width of the insulating member 122. The width of the insulating member 122 can be exactly the relative distance between the first clamping part 131 and the contact end 143 of the second stationary contact 142 when the first clamping part 131 is in the open position, or the width of the insulating member 122 can be exactly the relative distance between the second clamping part 132 and the contact end 143 of the first stationary contact 141 when the second clamping part 132 is in the open position. Of course, the width of the insulating member 122 can be smaller than the relative distance between the first clamping part 131 and the contact end 143 of the second stationary contact 142 when the first clamping part 131 is in the open position, or the width of the insulating member 122 can be smaller than the relative distance between the second clamping part 132 and the contact end 143 of the first stationary contact 141 when the second clamping part 132 is in the open position. As long as the insulating member 122 is provided between the first stationary contact 141 and the second clamping part 132, and between the first clamping part 131 and the second stationary contact 142, it is acceptable.

[0054] For example, such as Figure 1 and Figure 2 As shown, an arc-extinguishing chamber 150 is provided at the arc-extinguishing inlet of the arc-extinguishing area 113. An arc-running track is provided on the side of the arc-extinguishing chamber 150 near the arc-extinguishing outlet. The inlet of the arc-running track is connected to the arc-extinguishing chamber 150, and the outlet forms the arc-extinguishing outlet.

[0055] Specifically, such as Figure 1 and Figure 2 As shown, the arc-extinguishing chamber 150 is located within the arc-extinguishing zone 113 near the arc-extinguishing inlet. The inlet of the arc-extinguishing chamber 150 faces the arc-extinguishing inlet, and the outlet faces the inlet of the arc-running channel. The electric arc entering the arc-extinguishing zone 113 first enters the arc-extinguishing chamber 150 for arc extinguishing. The remaining arc particles and high-temperature fluid exit from the outlet of the arc-extinguishing chamber 150 and enter the arc-running channel, and then exit the casing 110 through the arc-extinguishing outlet via the arc-running channel.

[0056] Among them, such as Figure 5 As shown, the arc-extinguishing chamber 150 includes a first fixing plate 151 and a second fixing plate 152 arranged opposite to each other, the first fixing plate 151 and the second fixing plate 152 being parallel to the bottom surface of the housing 110; there are a plurality of spaced grids 153 between the first fixing plate 151 and the second fixing plate 152, the plurality of grids 153 extending from the arc-extinguishing inlet to the arc-running track.

[0057] In one possible implementation of this application, such as Figure 1 and Figure 3 As shown, the arc-running channel includes a first arc-running channel 160, which is located at the end of the arc-extinguishing chamber 150 near the opening position of the moving contact 130.

[0058] Specifically, such as Figure 1 and Figure 3 As shown, the first arc path 160 is located at the end of the arc-extinguishing chamber 150 near the open position of the moving contact 130. This open position is the maximum angular position that the moving contact 130 can move to during the opening operation of the switch unit 100. When the switch performs the opening action, the moving contact 130 gradually separates from the closed state where it is in close contact with the stationary contact 140. As the opening operation continues, the moving contact 130 continuously moves towards the open position.

[0059] Since the first arc path 160 is close to the open position of the moving contact 130, the electric arc generated during the process of the moving contact 130 moving to the maximum open position can be quickly guided into the arc extinguishing chamber 150 through the annular arc channel 114 and then leave the housing 110 through the first arc path 160.

[0060] During the transmission of the electric arc along the first arc path 160, the first arc path 160 gradually attenuates the energy of the electric arc and continuously reduces the temperature by lengthening the electric arc and enhancing heat dissipation, effectively reducing the possibility of arc reignition and greatly improving the efficiency and reliability of arc extinguishing.

[0061] In one possible implementation of this application, such as Figure 1 and Figure 3As shown, the arc-running track includes a second arc-running track 170, which is located at one end of the arc-extinguishing chamber 150 near the arc-starting point of the moving contact 130 and the stationary contact 140. The arc-starting point is the position where the moving contact 130 begins to disconnect from the stationary contact 140 and generates relative displacement.

[0062] Specifically, the second arc-running track 170 is located at one end of the arc-extinguishing chamber 150 near the arc-initiating point of the moving contact 130 and the stationary contact 140. The second arc-running track 170 and the first arc-running track 160 are located on opposite sides of the arc-extinguishing chamber 150. The arc-initiating point is the starting position where the moving contact 130 begins to move relative to the stationary contact 140 when the switch is opened. When the switch performs the opening operation, the moving contact 130 gradually separates from the closed state where it is in close contact with the stationary contact 140. As the opening operation continues, the moving contact 130 continuously moves towards the open position.

[0063] Since the second arc-running channel 170 is close to the arc-starting point of the moving contact 130 and the stationary contact 140, the high voltage between the contacts will quickly form an electric arc at the moment the moving and stationary contacts 140 separate. The electric arc can be quickly guided into the arc-extinguishing chamber 150 through the annular arc channel 114 and then leave the housing 110 through the second arc-running channel 170.

[0064] As the electric arc travels along the second arc path 170, the second arc path 170 gradually attenuates the energy of the arc and continuously lowers the temperature by lengthening the arc and enhancing heat dissipation, effectively reducing the possibility of arc reignition and greatly improving the efficiency and reliability of arc extinguishing.

[0065] Another aspect of this utility model, such as Figure 10 As shown, a disconnecting switch 200 is provided, including a handle 210, an operating mechanism 220, and multiple stacked switch units 100. The handle 210 and the operating mechanism 220 are drivenly connected, and the operating mechanism 220 is drivenly connected to the moving contact support 120 in each layer of switch unit 100 to control the on / off state of the moving contact 130 and the stationary contact 140 in each layer of switch unit 100. The specific structure and beneficial effects of the switch unit 100 have been described in detail above and will not be repeated here. The disconnecting switch 200, through the arrangement of the switch units 100, improves the efficiency of arc conduction and extinguishing, and also enhances the safety of the disconnecting switch 200 in use.

[0066] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A switching unit, characterized in that, The device includes a housing (110), a moving contact support (120), a moving contact (130), and a stationary contact (140) that cooperate with each other. The moving contact (130) is disposed within the moving contact support (120) and extends at least partially from the side wall of the moving contact support (120) to the outside of the moving contact support (120), and is rotatably disposed within the housing (110) via the moving contact support (120). The stationary contact (140) is fixedly disposed. The housing (110) contains an arc-extinguishing area (113) and an annular arc channel (114). The annular arc channel (114) is located on the opening and closing path of the moving contact (130) and the stationary contact (140). The arc-extinguishing inlet of the arc-extinguishing area (113) is connected to the annular arc channel (114), and the arc-extinguishing outlet of the arc-extinguishing area (113) is connected to the outside of the housing (110).

2. The switching unit according to claim 1, characterized in that, The depth of the annular arc channel (114) is greater than or equal to the thickness of the moving contact (130), and both the depth direction and the thickness direction are in the same direction as the thickness direction of the housing (110).

3. The switching unit according to claim 2, characterized in that, The width of the annular arc channel (114) is greater than or equal to the length of the moving contact (130) disposed outside the moving contact support (120), and the width direction is perpendicular to the depth direction.

4. The switching unit according to claim 1, characterized in that, The housing (110) includes an upper shell (111) and a lower shell (112) that are interlocked. The upper shell (111) and the lower shell (112) enclose a cavity. The moving contact support (120), the moving contact (130), and the stationary contact (140) are disposed in the cavity. The upper shell (111) has an upper rib (1111) facing the lower shell (112), and the lower shell (112) has a corresponding lower rib (1121) facing the upper shell (111). The upper rib (1111) and the lower rib (1121) enclose a ring-shaped arc channel (114).

5. The switching unit according to claim 4, characterized in that, The upper rib (1111) has an annular structure protruding from the upper shell (111), and the outer wall of the upper rib (1111) is provided with a snap-fit ​​groove (1112); the lower rib (1121) has an annular structure protruding from the lower shell (112), and the periphery of the lower rib (1121) is provided with a snap-fit ​​rib (1122), which is located between the arc-extinguishing area (113) and the stationary contact (140); the snap-fit ​​rib (1122) can be snapped into the snap-fit ​​groove (1112) so that the upper rib (1111) and the lower rib (1121) are arranged opposite each other and have a preset interval, and the part of the moving contact (130) extending to the outside of the moving contact support (120) is located between the upper rib (1111) and the lower rib (1121).

6. The switching unit according to claim 4, characterized in that, The switching unit (100) further includes an insulating member (122), which protrudes from the side edge of the moving contact bracket (120); when the moving contact (130) is in the open position, the insulating member (122) is disposed between the moving contact (130) and the stationary contact (140) along the opening direction of the moving contact (130).

7. The switching unit according to claim 6, characterized in that, The length of the insulating element (122) protruding from the moving contact bracket (120) is greater than or equal to the length of the moving contact (130) disposed outside the moving contact bracket (120).

8. The switching unit according to claim 1, characterized in that, An arc-extinguishing chamber (150) is provided at the arc-extinguishing inlet of the arc-extinguishing area (113). An arc-running track is provided on the side of the arc-extinguishing chamber (150) near the arc-extinguishing outlet. The inlet of the arc-running track is connected to the arc-extinguishing chamber (150), and the outlet forms the arc-extinguishing outlet.

9. The switching unit according to claim 8, characterized in that, The arc path includes a first arc path (160) and a second arc path (170). The first arc path (160) is located at the end of the arc-extinguishing chamber (150) near the opening position of the moving contact (130). The second arc path (170) is located at the end of the arc-extinguishing chamber (150) near the arc-starting point of the moving contact (130) and the stationary contact (140). The arc-starting point is the position where the moving contact (130) begins to open with the stationary contact (140) and generate relative displacement.

10. A disconnecting switch, characterized in that, The switch includes a handle (210), an operating mechanism (220), and a plurality of stacked switch units (100) as described in any one of claims 1-9, wherein the handle (210) and the operating mechanism (220) are drivenly connected, and the operating mechanism (220) is drivenly connected to a moving contact support (120) in each layer of the switch unit (100).

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