Double-break isolating switch

Abstract

The utility model belongs to the technical field of disconnecting switches, and discloses a double-break disconnecting switch, which comprises a static contact mechanism and a moving contact mechanism. The static contact mechanism comprises two static contact assemblies which are distributed at an interval, and each static contact assembly is provided with a first jack. The moving contact mechanism comprises a moving knife, a linkage assembly and two moving contacts, the moving knife is provided with a channel penetrating in the length direction of the moving knife, the moving knife can rotate so that the two ends of the moving knife can be in butt joint with or separated from the two static contact assemblies respectively, the linkage assembly is arranged on the moving knife, and the two moving contacts are arranged in the channel in a sliding mode and are in transmission connection with the linkage assembly respectively; in other words, the two moving contacts are arranged on the two sides in the channel in a sliding mode respectively, and the linkage assembly can drive the two moving contacts to move oppositely to be connected with the two first jacks in an inserted mode respectively and reversely drive the two moving contacts to move oppositely to be separated from the two first jacks respectively. The structure principle is simple, and the moving contact is not separated from the first jack when being plugged with the first jack.

Description

Technical Field

[0001] This utility model relates to the field of disconnecting switch technology, and in particular to a double-break disconnecting switch. Background Technology

[0002] The closing process of a traditional double-break high-voltage disconnector is as follows: First, the moving blade rotates to bring the moving contact to the closed position. Second, the moving blade rotates around its own axis, causing the moving contact to rotate along the axis of the moving blade, so that the moving contact changes from an inclined state to a vertical state, thus pressing against the two rows of horizontally placed plate-shaped contact fingers to achieve closing. The opening process is the reverse: First, the moving blade rotates in the opposite direction around its own axis, disengaging the moving contact from the plate-shaped contact fingers. Second, the moving blade rotates back to the opening position to achieve opening. In the above structure, after the moving blade rotates to the closed position, it still needs to rotate around its own axis to achieve closing. The structure and operating principle are relatively complex, and the manufacturing process is difficult. Moreover, in order to achieve the rotation of the moving contact to abut against the plate-shaped contact fingers, the plate-shaped contact fingers need to be designed as an open structure. During closing, the moving contact and the plate-shaped contact fingers are prone to disengagement, resulting in poor resistance to electrodynamic forces. Utility Model Content

[0003] The purpose of this utility model is to provide a double-break disconnect switch that can achieve closing without rotating the blade around its own axis. It has a simple structure, no risk of disconnection, and strong resistance to electrodynamic forces.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] Double-break disconnector, including:

[0006] A stationary contact mechanism includes two spaced-apart stationary contact assemblies, each stationary contact assembly having a first insertion hole;

[0007] The moving contact mechanism includes a moving blade, a linkage component, and two moving contacts. The moving blade is provided with a channel extending along its length, and the two moving contacts are slidably disposed in the channel and are respectively connected to the linkage component for transmission.

[0008] The moving blade can rotate so that its two ends respectively engage or disengage with the two stationary contact assemblies. The linkage assembly can drive the two moving contacts to move in opposite directions to engage with the two first sockets respectively, and drive the two moving contacts to move towards each other to disengage from the two first sockets respectively.

[0009] As an optional solution, the linkage assembly includes a crank arm, two hinge rods, and two linkage rods corresponding one-to-one with the two hinge rods. The crank arm is rotatably connected to the moving blade via a rotating shaft. The two linkage rods are disposed within the channel and located on both sides of the crank arm. The hinge rods are hinged between the crank arm and the linkage rods. The ends of the two linkage rods away from the crank arm are respectively connected to the two moving contacts. When the crank arm rotates, it can drive the two linkage rods to respectively extend the two moving contacts out of the moving blade and insert them into the two first insertion holes, or respectively drive the two moving contacts to retract into the moving blade and disengage from the two first insertion holes.

[0010] As an alternative, an elastic element is connected between the rotating shaft and the two linkage rods. When the moving contact is inserted into the first socket, the elastic element is stretched to store energy. When the moving contact is disengaged from the first socket, the elastic element contracts and returns to its original position.

[0011] As an alternative, the linkage rod is provided with an oblong hole extending along the moving direction of the linkage rod, and a guide rod is provided in the channel at a position corresponding to the oblong hole. The guide rod passes through the oblong hole to limit the radial sway of the linkage rod along the guide rod when it moves.

[0012] As an alternative, two limiting rollers are provided on the guide rod, and the linkage rod is clamped between the two corresponding limiting rollers to limit the axial sway of the linkage rod along the guide rod when it moves.

[0013] As an optional solution, the channel is provided with a first limiting rod and a second limiting rod. The first limiting rod is used to limit the crank arm when it is in the closed position, and the second limiting rod is used to limit the crank arm when it is in the open position.

[0014] As an optional solution, the stationary contact assembly includes a terminal block;

[0015] The moving contact mechanism also includes two arc contacts respectively disposed at both ends of the moving blade. When the moving blade rotates to dock with the stationary contact assembly, the arc contacts abut against the terminal block.

[0016] As an optional solution, the stationary contact assembly includes a first contact box, the first contact box being provided with the first socket;

[0017] Correspondingly, the two ends of the moving blade are provided with a second contact box, the second contact box is provided with a second insertion hole, and the moving contact is slidably inserted into the second insertion hole.

[0018] As an alternative, the inner walls of both the first and second sockets are provided with spring contacts. When the moving contact is inserted into the first socket, the moving contact simultaneously makes electrical contact with both the spring contacts in the second socket and the spring contacts in the first socket.

[0019] As an alternative, the moving blade is an aluminum tube.

[0020] The beneficial effects of this utility model are:

[0021] The double-break disconnect switch provided by this utility model slides the moving contact in the channel so that when the moving blade rotates to dock with the stationary contact assembly, there is no need for the moving blade to rotate around its own axis. The linkage component can drive the moving contact to move linearly along the channel to connect or disconnect with the first socket, thereby realizing the closing or opening of the circuit. The structure and principle are simple, there is no radial force on the first socket, there is no risk of disengagement when the moving contact is connected to the first socket, and the resistance to electrodynamic forces is strong. Attached Figure Description

[0022] Figure 1 This is a top view of the double-break disconnector provided in this embodiment of the present invention when it is in the open state;

[0023] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0024] Figure 3 This is a top view of the double-break disconnect switch provided in this embodiment of the present invention when it is in the closed state;

[0025] Figure 4 yes Figure 3 Enlarged view of the structure at point B;

[0026] Figure 5 yes Figure 3 Enlarged view of the structure at point C;

[0027] Figure 6 This is a front view of the double-break disconnect switch provided in this embodiment of the present invention when it is in the closed state;

[0028] Figure 7 yes Figure 6 Enlarged view of the structure at point D.

[0029] In the picture:

[0030] 1. Stationary contact mechanism; 11. Stationary contact assembly; 111. Terminal block; 112. First contact box; 1121. First socket;

[0031] 2. Moving contact mechanism; 21. Moving blade; 211. Guide rod; 212. Limiting roller; 213. First limiting rod; 214. Second limiting rod; 215. Arc contact; 216. Second contact box; 22. Linkage assembly; 221. Crank arm; 222. Hinge rod; 2221. Waist-shaped hole; 223. Linkage rod; 224. Elastic element; 23. Moving contact;

[0032] 3. Spring-loaded contact finger;

[0033] 4. First insulator;

[0034] 5. Second insulator. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figures 1-7 As shown, this embodiment of the utility model provides a double-break disconnect switch, which includes a stationary contact mechanism 1 and a moving contact mechanism 2.

[0040] The stationary contact mechanism 1 includes two spaced-apart stationary contact assemblies 11, each with a first insertion hole 1121. The moving contact mechanism 2 includes a moving blade 21, a linkage assembly 22, and two moving contacts 23. The moving blade 21 has a channel extending along its length. The moving blade 21 can rotate so that its two ends are respectively engaged with or disengaged from the two stationary contact assemblies 11. The linkage assembly 22 is disposed on the moving blade 21. The two moving contacts 23 are slidably disposed within the channel and are respectively connected to the linkage assembly 22. That is, the two moving contacts 23 are respectively slidably disposed on both sides of the channel. The linkage assembly 22 can drive the two moving contacts 23 to move in opposite directions to engage with the two first insertion holes 1121, and can also drive the two moving contacts 23 to move in opposite directions to disengage from the two first insertion holes 1121.

[0041] When the double-break disconnector switches from the open state to the closed state, the moving blade 21 first rotates 70° so that both ends of the moving blade 21 are respectively connected to the two stationary contact assemblies 11. Then the linkage assembly 22 drives the two moving contacts 23 to move in opposite directions and connect to the two first sockets 1121 respectively to achieve closing. When the double-break disconnector switches from the closed state to the open state, the linkage assembly 22 first drives the two moving contacts 23 to move in opposite directions and disengage from the two first sockets 1121 respectively. Then the moving blade 21 rotates 70° in the opposite direction to separate from the stationary contact assembly 11 to achieve opening.

[0042] This double-break disconnector switches slides the moving contact 23 within the channel so that when the moving blade 21 rotates to mate with the stationary contact assembly 11, the moving blade 21 does not need to rotate around its own axis. The linkage assembly 22 can drive the moving contact 23 to move linearly along the channel to connect or disconnect with the first socket 1121, thus achieving closing or opening. The structure and principle are simple, there is no radial force on the first socket 1121, there is no risk of disengagement when the moving contact 23 is connected to the first socket 1121, and it has strong resistance to electrodynamic forces.

[0043] Specifically, such as Figure 2 and Figure 4As shown, the linkage assembly 22 includes a crank arm 221, two hinge rods 222, and two linkage rods 223 (made of insulating material). The crank arm 221 is rotatably connected to the moving blade 21 via a rotating shaft. The two linkage rods 223 are located in the channel on both sides of the crank arm 221. The two linkage rods 223 are connected to the two ends of the crank arm 221 via the two hinge rods 222, that is, each hinge rod 222 is hinged between one end of the crank arm 221 and the corresponding linkage rod 223. The ends of the two linkage rods 223 away from the crank arm 221 are connected to two moving contacts 23 respectively. When the double-break disconnector switches to the closed state, the moving blade 21 first rotates to mate with the stationary contact assembly 11, and then the crank arm 221 rotates to the closed position. During the rotation of the crank arm 221 to the closed position, it can drive the two linkage rods 223 to move in opposite directions. The two linkage rods 223 then drive the two moving contacts 23 to move in opposite directions, extend out of the moving blade 21, and insert into the two first sockets 1121 respectively. When the double-break disconnector switches to the open state, the crank arm 221 first rotates in the opposite direction to the open position. During the rotation of the crank arm 221 to the open position, the crank arm 221 drives the two linkage rods 223 to move in opposite directions. The two linkage rods 223 then drive the two moving contacts 23 to move in opposite directions and retract into the moving blade 21, disengaging from the two first sockets 1121 respectively. This structure converts the rotational motion of the crank arm 221 into the linear motion of the linkage rod 223 by setting the crank arm 221 to be rotatably connected to the moving blade 21 and hinged to the two ends of the crank arm 221 respectively. The structure is simple and easy to operate. Furthermore, by retracting the moving contact 23 into the moving blade 21, interference between the moving contact 23 and the stationary contact assembly 11 can be avoided when the moving blade 21 rotates.

[0044] In this embodiment, when the crank arm 221 is in the closed position, it rotates completely into the channel and is parallel to the channel. When the crank arm 221 is in the open position, both ends of the crank arm 221 rotate out of the channel, and the crank arm 221 is angled to the channel. Along a direction perpendicular to the channel, the rotating shaft is rotatably connected to the moving blade 21, with one end extending into the channel and fixedly connected to the crank arm 221, and the other end located outside the channel and connected to the first insulator 4. Rotation of the first insulator 4 enables the crank arm 221 to rotate.

[0045] Furthermore, elastic elements 224 are connected between the rotating shaft and the two linkage rods 223. When the crank arm 221 rotates to the closed position, the elastic element 224 is in a stretched state to store energy. When the crank arm 221 rotates to the open position, the elastic element 224 retracts and resets. That is, when the crank arm 221 rotates to the closed position, it needs to overcome the elastic force of the elastic element 224 to stretch the elastic element 224 to store energy. When the crank arm 221 rotates to the open position, the elastic element 224 releases its elastic potential energy, enabling the crank arm 221 to quickly rotate to the open position. When the double-break disconnector switches to the closed state, rotating the first insulator 4 drives the crank arm 221 to rotate. Due to the elastic force of the elastic element 224, the moving blade 21 first rotates to engage with the stationary contact assembly 11. Then, after the moving blade 21 reaches its position, further rotation of the first insulator 4 causes the crank arm 221 to overcome the elastic force of the elastic element 224 and rotate to the closed position, thus achieving closing. When the double-break disconnector switches to the open state, rotating the first insulator 4 in the opposite direction drives the crank arm 221 to rotate in the opposite direction. Because the elastic element 224 is under tension, the crank arm 221 first rotates to the open position when the elastic element 224 releases its elastic potential energy. Then, further rotation of the first insulator 4 causes the moving blade 21 to rotate to separate from the stationary contact assembly 11, thus achieving opening. This structure completes the rotation of the moving blade 21 and the crank arm 221 in a single step, making it simple in structure and reliable in operation.

[0046] Optionally, the elastic element 224 can be selected as a tension spring or an elastic band.

[0047] Optionally, the linkage rod 223 is provided with an oblong hole 2221 extending along the moving direction of the linkage rod 223. A guide rod 211 is provided in the channel at a position corresponding to the oblong hole 2221. The guide rod 211 passes through the oblong hole 2221 to limit the linkage rod 223 from swaying radially along the guide rod 211 when it moves. This structure guides the linkage rod 223 by setting the guide rod 211, so that the linkage rod 223 does not sway when it is subjected to the force of the crank arm 221.

[0048] Furthermore, two limiting rollers 212 are threaded through each guide rod 211 (in conjunction with...) Figures 6-7 Each guide rod 211 has two limiting rollers 212 on opposite ends that abut against the inner wall of the channel. The linkage rod 223 is clamped between the corresponding two limiting rollers 212 to limit the axial swing of the linkage rod 223 along the guide rod 211 when it moves.

[0049] Optionally, a first limiting rod 213 and a second limiting rod 214 are provided in the channel. When the crank arm 221 rotates to the closed position, the first limiting rod 213 can abut against the crank arm 221 to limit the excessive rotation of the crank arm 221 and restrict the crank arm 221 to the closed position. When the crank arm 221 rotates to the open position, the second limiting rod 214 can abut against the crank arm 221 to limit the excessive rotation of the crank arm 221 and restrict the crank arm 221 to the open position.

[0050] In this embodiment, the stationary contact assembly 11 is disposed on the second insulator 5, the two second insulators 5 are spaced apart, and the first insulator 4 is located between the two second insulators 5.

[0051] Specifically, such as Figure 5 As shown, the stationary contact assembly 11 includes a terminal block 111, which is disposed on the second insulator 5. The moving contact mechanism 2 also includes arc contacts 215 respectively disposed at both ends of the moving blade 21. When the moving blade 21 rotates to mate with the stationary contact assembly 11, the arc contacts 215 can abut against the terminal block 111. In this structure, when the moving blade 21 rotates to mate with the stationary contact mechanism 1, the arc contacts 215 and the terminal block 111 simultaneously complete the arc ignition and extinguishing process, and the abutment between the arc contacts 215 and the terminal block 111 can limit the rotation of the moving blade 21. It can be understood that when the moving blade 21 rotates in the opposite direction to open the circuit, the arc contacts 215 and the terminal block 111 simultaneously complete the arc ignition and extinguishing process.

[0052] Optionally, the terminal block 111 is made of conductive aluminum plate, and its corners are provided with arc-extinguishing material for extinguishing arcs.

[0053] Furthermore, the stationary contact assembly 11 also includes a first contact box 112, which is disposed on the terminal block 111 and has a first socket 1121. The two ends of the moving blade 21 are provided with second contact boxes 216, each with a second socket located within a channel. The moving contact 23 slides through the second socket. This structure enables precise guidance of the moving contact 23 via the second socket, ensuring accurate insertion of the moving contact 23 into the first socket 1121.

[0054] Optionally, both the first contact box 112 and the second contact box 216 are made of conductive aluminum or copper, and the surfaces of the first contact box 112 and the second contact box 216 can be plated with silver or tin to prevent oxidation.

[0055] Furthermore, the inner walls of the first socket 1121 and the second socket are both provided with spring contact fingers 3. When the moving contact 23 is inserted into the first socket 1121, the moving contact 23 can simultaneously make electrical contact with the spring contact in the second socket and the spring contact fingers 3 in the first socket 1121 to achieve current flow and thus complete the closing.

[0056] The spring contact 3 is a ring structure made of special self-strength conductive copper wire. Its conductive cross-section is a spring. When the moving contact 23 is inserted into the first socket 1121, the cross-sectional spring is compressed, and all cross-sectional springs within the entire annular circumference of the spring contact 3 undergo uniform deformation. This causes the spring contact 3 to saturate and expand, enveloping the moving contact 23, thus achieving multi-loop linear current conduction. The self-strength material properties and cross-sectional spring structure of the spring contact 3 increase the uniformity and stability of the 360° clamping force of the overall annular structure. The conductive surface of the spring contact 3 is coated with graphene silver or conventionally silver-plated to enhance conductivity.

[0057] Optionally, the number of spring contacts 3 in the first socket 1121 and the number of spring contacts 3 in the second socket can be set according to the current flow.

[0058] Understandably, when the double-break disconnector is in the closed state, the moving contact 23 and the spring contact 3 are in a closed state, so that even if the spring contact 3 is subjected to external force, it cannot be disengaged from the moving contact 23, thus ensuring the reliability of current flow and enhancing the ability to withstand electrodynamic forces.

[0059] Optionally, the moving blade 21 can be manufactured using conductive aluminum tubes or other aluminum profiles. The moving blade 21 can be square or round. The two ends of the moving blade 21 can be plated with silver or tin to prevent oxidation.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A double-break disconnect switch, characterized in that, include: The stationary contact mechanism (1) includes two stationary contact assemblies (11) spaced apart, wherein the stationary contact assembly (11) is provided with a first socket (1121); The moving contact mechanism (2) includes a moving blade (21), a linkage component (22) and two moving contacts (23). The moving blade (21) is provided with a channel that runs through it along its length. The two moving contacts (23) are slidably disposed in the channel and are respectively connected to the linkage component (22) in a transmission manner. The moving blade (21) can rotate so that its two ends are respectively connected to or separated from the two stationary contact assemblies (11). The linkage assembly (22) can drive the two moving contacts (23) to move in opposite directions to be connected to the two first sockets (1121) respectively, and drive the two moving contacts (23) to move towards each other to disengage from the two first sockets (1121) respectively.

2. The double-break disconnector according to claim 1, characterized in that, The linkage assembly (22) includes a crank arm (221), two hinge rods (222), and two linkage rods (223) corresponding one-to-one with the two hinge rods (222). The crank arm (221) is rotatably connected to the moving blade (21) via a pivot. The two linkage rods (223) are disposed within the channel and located on both sides of the crank arm (221). The hinge rods (222) are hinged to the crank arm (221) and the linkage rods (222). Between 3), the ends of the two linkage rods (223) away from the crank arm (221) are respectively connected to the two moving contacts (23). When the crank arm (221) rotates, it can drive the two linkage rods (223) to drive the two moving contacts (23) to extend out of the moving blade (21) and insert into the two first sockets (1121) or drive the two moving contacts (23) to retract into the moving blade (21) and disengage from the two first sockets (1121).

3. The double-break disconnect switch according to claim 2, characterized in that, An elastic element (224) is connected between the rotating shaft and the two linkage rods (223). When the moving contact (23) is inserted into the first socket (1121), the elastic element (224) is stretched and stores energy. When the moving contact (23) is disengaged from the first socket (1121), the elastic element (224) contracts and resets.

4. The double-break disconnect switch according to claim 2, characterized in that, The linkage rod (223) is provided with an oblong hole (2221) extending along the moving direction of the linkage rod (223). A guide rod (211) is provided in the channel at a position corresponding to the oblong hole (2221). The guide rod (211) passes through the oblong hole (2221) to limit the radial sway of the linkage rod (223) along the guide rod (211) when it moves.

5. The double-break disconnect switch according to claim 4, characterized in that, Two limiting rollers (212) are threaded through the guide rod (211), and the linkage rod (223) is clamped between the two corresponding limiting rollers (212) to limit the axial swing of the linkage rod (223) along the guide rod (211) when it moves.

6. The double-break disconnect switch according to claim 2, characterized in that, The channel is provided with a first limiting rod (213) and a second limiting rod (214). The first limiting rod (213) is used to limit the crank arm (221) in the closed position, and the second limiting rod (214) is used to limit the crank arm (221) in the open position.

7. The double-break disconnector according to any one of claims 1-6, characterized in that, The stationary contact assembly (11) includes a terminal block (111); The moving contact mechanism (2) also includes two arc contacts (215) respectively disposed at both ends of the moving blade (21). When the moving blade (21) rotates to dock with the stationary contact assembly (11), the arc contacts (215) abut against the terminal block (111).

8. The double-break disconnector according to any one of claims 1-6, characterized in that, The stationary contact assembly (11) includes a first contact box (112), and the first contact box (112) is provided with the first socket (1121); Correspondingly, the two ends of the moving blade (21) are provided with a second contact box (216), the second contact box (216) is provided with a second insertion hole, and the moving contact (23) slides through the second insertion hole.

9. The double-break disconnector according to claim 8, characterized in that, The inner wall of the first socket (1121) and the inner wall of the second socket are both provided with spring contact fingers (3). When the moving contact (23) is inserted into the first socket (1121), the moving contact (23) simultaneously makes electrical contact with the spring contact fingers (3) in the second socket and the spring contact fingers (3) in the first socket (1121).

10. The double-break disconnector according to any one of claims 1-6, characterized in that, The moving blade (21) is an aluminum tube.

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