Vacuum type load switch

Abstract

The invention relates to the technical field of switching devices, and aims to solve the problems that an existing vacuum load switch is not smooth in operation and complex in current transfer path and possibly has potential safety hazards. In order to achieve the purpose, the invention provides the vacuum type load switch which comprises a vacuum arc-extinguishing chamber, and a static contact and a moving contact are arranged in the vacuum arc-extinguishing chamber; and the conductive structure can be operated to control the disconnection / connection of the moving contact and the static contact, thereby realizing the opening / closing of the vacuum type load switch. According to the vacuum type load switch, through the design of the vacuum arc extinguishing chamber and the conductive structure, it is ensured that an electric arc can be rapidly extinguished when a circuit is disconnected, the safety performance of the switch and the short-circuit closing capacity of the switch are improved, the fault probability of the switch is reduced, the overall robustness of the switch is improved, and the operation reliability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of switch electrical appliances, in particular to a vacuum type load switch. Background Art

[0002] The load switch can cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current.

[0003] Vacuum load switches use vacuum as an arc extinguishing medium for breaking. SF6 gas is a strong greenhouse gas that is harmful to the environment. In terms of environmental protection, vacuum load switches have significant advantages over load switches using SF6 gas. In addition, vacuum load switches extinguish arcs through vacuum interrupters, are not affected by the external environment, have high reliability, and have no risk of explosion. The contact opening distance is small. Vacuum load switches are faster and more efficient in operation. At the same time, combined with air at a certain pressure to improve insulation, it is a completely environmentally friendly load switch solution.

[0004] The existing vacuum load switches still have the following problems:

[0005] The vacuum interrupter of the existing load switch has complex transmission structure, high failure probability, poor robustness, insufficient short-circuit closing capacity and other problems, which are prone to safety hazards. Summary of the invention

[0006] (I) Purpose of the invention

[0007] The purpose of the present invention is to provide a vacuum load switch with a simple transmission structure and functions of opening and closing, so as to solve the problems of complex structure, high failure probability, poor robustness, insufficient short-circuit closing capacity, etc. of the existing vacuum load switch.

[0008] (II) Technical solution

[0009] In order to solve the above problems, the present invention provides a vacuum load switch, comprising:

[0010] A vacuum interrupter chamber, wherein a static contact and a moving contact are arranged in the vacuum interrupter chamber;

[0011] The conductive structure can be operated to control the disconnection / connection of the moving contact and the static contact, thereby realizing the opening / closing of the vacuum type load switch.

[0012] Preferably, the conductive structure comprises: a movable conductive blade, a static conductive blade, a conductive seat, a first conductive connecting rod, a second conductive connecting rod and a conductive busbar;

[0013] The static contact is electrically connected to the conductive busbar, the dynamic contact is rotationally and electrically connected to one end of the second conductive link, the other end of the second conductive link is movably connected to the first conductive link to allow the other end of the second conductive link to be able to slide relative to the first conductive link and to be able to rotate and electrically connected relative to the first conductive link, the dynamic conductive blade is rotationally connected to the conductive seat, the dynamic conductive blade rotates around the conductive seat and contacts the first conductive link, and the static conductive blade is fixedly connected to the conductive busbar;

[0014] Preferably, the conductive structure further comprises a conductive connection mechanism;

[0015] The upper part of the conductive connection mechanism is connected to the shell of the vacuum arc extinguishing chamber, one end of the lower part of the conductive connection mechanism is rotatably connected to the first conductive connecting rod, and the other end of the lower part of the conductive connection mechanism is rotatably connected to the second conductive connecting rod.

[0016] Preferably, a spring is provided between the first conductive connecting rod and the second conductive connecting rod.

[0017] Preferably, the vacuum type load switch further comprises a static connecting rod and a dynamic connecting rod;

[0018] The static connecting rod electrically connects the static contact with the conductive busbar;

[0019] The moving link electrically connects the moving contact and the second conductive link.

[0020] Preferably, one of the first conductive link and the second conductive link is provided with a conductive column, and the other is provided with a long slot hole, and the conductive column is arranged in the long slot hole, so that the other end of the second conductive link can both slide and rotate relative to the first conductive link.

[0021] Preferably, the portion of the movable conductive blade for contacting the first conductive connecting rod is configured as an arc-shaped contact surface; and / or

[0022] The portion of the first conductive link used for contacting the movable conductive blade is configured as an arc-shaped contact surface.

[0023] Preferably, the vacuum type load switch further comprises a base;

[0024] The base is used to limit the limit position of the dynamic conductive blade.

[0025] Preferably, the movable connecting rod and the second conductive connecting rod are rotatably connected by bolts.

[0026] Preferably, the conductive connection mechanism is connected to the middle position of the first conductive connecting rod and the middle position of the second conductive connecting rod by bolts.

[0027] (III) Beneficial effects

[0028] The above technical solution of the present invention has the following beneficial technical effects:

[0029] The vacuum load switch of the present invention ensures that the arc can be quickly extinguished when the circuit is disconnected by arranging a vacuum arc extinguishing chamber and a conductive structure, thereby improving the safety performance of the switch.

[0030] The vacuum load switch of the present invention improves the short-circuit closing capacity of the switch, reduces the failure probability of the switch, and improves the overall robustness of the switch by arranging a conductive structure including: a moving conductive blade, a static conductive blade, a conductive seat, a first conductive connecting rod, a second conductive connecting rod, a conductive busbar and a spring.

[0031] The vacuum load switch of the present invention provides smoother and more accurate contact by arranging the arc-shaped contact surface between the movable conductive blade and the first conductive connecting rod, reduces friction and wear during operation, and improves the reliability of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is an overall schematic diagram of the vacuum load switch of the present invention in a closed state;

[0034] Figure 2 It is a schematic diagram of the vacuum load switch of the present invention at the initial stage of opening action;

[0035] Figure 3 It is a schematic diagram of the vacuum load switch of the present invention in the middle stage of the opening action;

[0036] Figure 4 It is a schematic diagram of the vacuum load switch of the present invention at the stage of completing the opening action;

[0037] Figure 5 It is a schematic diagram of the vacuum load switch of the present invention in the middle stage of closing action;

[0038] Figure 6 It is a schematic diagram of the vacuum load switch of the present invention at the stage of completing the closing action;

[0039] Reference numerals:

[0040] 1-vacuum arc extinguishing chamber; 11-static contact; 12-moving contact; 13-static connecting rod; 14-moving connecting rod; 2-moving conductive blade; 3-static conductive blade; 4-conductive seat; 5-first conductive connecting rod; 51-conductive column; 6-second conductive connecting rod; 61-long slot hole; 7-conductive busbar; 8-conductive connecting mechanism; 9-base. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0042] The drawings provided in the present invention are intended to present the features and implementation methods of the embodiments of the present invention. The drawings do not have to be drawn according to the dimensions of a specific implementation scheme. The positions of some components in the drawings may be adjusted according to actual conditions without affecting the technical effects.

[0043] The directions or positional relationships indicated by the terms "up", "down", "left", "right", "clockwise", "counterclockwise", etc. that appear in the embodiments of the present invention are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate that the device referred to must have a specific orientation.

[0044] Descriptions such as “first” and “second” in the embodiments of the present invention do not indicate any order or importance in the present invention, but are used to distinguish one component from other components.

[0045] Based on the technical problems proposed in the background technology, during the operation of the existing vacuum load switch, during the closing and opening operations, the rotation and connection mode of the conductive parts affect the smoothness of the operation, thereby affecting the overall performance of the switch; the connection mode between the conductive blade and the conductive connecting rod may cause the arc to be unable to be effectively extinguished during the operation, affecting the safety of the switch; during the opening and closing operations, the current transfer path is complex, which may lead to uneven current distribution, affecting the stability and reliability of the switch. The present invention provides a vacuum load switch to solve the problems of the existing vacuum load switch, such as the unsmooth operation, complex current transfer path and possible safety hazards, and improve the overall performance of the switch.

[0046] like Figure 1-Figure 6 As shown, the vacuum load switch of the present invention comprises a vacuum interrupter 1, in which a static contact 11 and a moving contact 12 are arranged;

[0047] It also includes a conductive structure, which can be operated to control the disconnection / connection of the moving contact 12 and the static contact 11, thereby realizing the opening / closing of the vacuum load switch, which can ensure that the arc can be extinguished quickly when the circuit is disconnected, thereby improving the safety performance of the switch.

[0048] Combination Figure 1 The conductive structure includes: a dynamic conductive blade 2, a static conductive blade 3, a conductive seat 4, a first conductive connecting rod 5, a second conductive connecting rod 6 and a conductive busbar 7, which can optimize the current transmission path, reduce the generation of resistance and arc, and improve the efficiency of current transmission, thereby improving the stability and reliability of the switch.

[0049] The stationary contact 11 is electrically connected to the conductive busbar 7, and the moving contact 12 is rotationally and electrically connected to one end of the second conductive connecting rod 6;

[0050] One end of the moving conductive blade 2 is rotatably connected to the conductive seat 4 and can rotate around the axis of the connection between the moving conductive blade 2 and the conductive seat 4 . One end of the static conductive blade 3 is fixedly connected to the conductive busbar 7 .

[0051] Preferably, if Figure 1 As shown, when the vacuum load switch of the present invention is in a closed state, the other end of the moving conductive blade 2 is in contact with the other end of the static conductive blade 3;

[0052] like Figure 2 As shown, when the vacuum load switch of the present invention is in opening action, the other end of the movable conductive blade 2 contacts one end of the first conductive connecting rod 5 .

[0053] The other end of the second conductive connecting rod 6 is movably connected to the other end of the first conductive connecting rod 5;

[0054] Furthermore, the other end of the second conductive link 6 can both slide relative to the other end of the first conductive link 5 and rotate relative to the other end of the first conductive link 5 and be electrically connected;

[0055] In one embodiment, in combination Figure 1-Figure 6 A conductive column 51 is provided on the first conductive link 5, and a long slot hole 61 is provided on the second conductive link 6. The conductive column 51 is arranged in the long slot hole 61, so that the other end of the second conductive link 6 can both slide and rotate relative to the other end of the first conductive link 5.

[0056] In another embodiment, in combination Figure 1-Figure 6 A long slot hole 61 is provided on the first conductive link 5, and a conductive column 51 is provided on the second conductive link 6. The conductive column 51 is arranged in the long slot hole 61, so that the other end of the second conductive link 6 can both slide and rotate relative to the other end of the first conductive link 5.

[0057] Preferably, the diameter of the conductive column 51 is slightly smaller than the width of the long slot hole 61 and the conductive column 51 passes through the long slot hole 61. When the first conductive link 5 is rotated around the axis by the movable conductive blade 2, the conductive column 51 slides in the long slot hole 61 and collides with the hole wall, and at the same time drives the second conductive link 6 to rotate around the axis under the action of force.

[0058] The portion of the movable conductive blade 2 for contacting the first conductive connecting rod 5 is configured as an arc-shaped contact surface; and / or

[0059] The part of the first conductive link 5 for contacting the movable conductive blade 2 is set as an arc-shaped contact surface. When the movable conductive blade 2 rotates around the axis of the connection between it and the conductive seat 4, it can just contact the first conductive link 5 and drive the first conductive link 5 to rotate around the axis, and the movable conductive blade 2 can be disconnected from the first conductive link 5 under the action of inertia. This arrangement provides smoother and more precise contact, reduces friction and wear during operation, and further improves the reliability of operation.

[0060] Preferably, the portion of the moving conductive blade 2 used to contact the first conductive connecting rod 5 can also be replaced by a bevel or other non-planar structure so as to achieve a smooth and reliable transition connection between the moving conductive blade 2 and the first conductive connecting rod 5, thereby reducing friction and wear during the contact process, while ensuring smooth movement during closing and opening operations.

[0061] In one embodiment;

[0062] Combination Figure 1-Figure 6 , the conductive structure of the vacuum load switch of the present invention further includes a conductive connecting mechanism 8;

[0063] The upper part of the conductive connection mechanism 8 is connected to the shell of the vacuum interrupter 1 , one end of the lower part of the conductive connection mechanism 8 is rotatably connected to the first conductive connecting rod 5 , and the other end of the lower part of the conductive connection mechanism 8 is rotatably connected to the second conductive connecting rod 6 .

[0064] Preferably, the conductive connection mechanism 8 is connected to the middle position of the first conductive connecting rod 5 and the middle position of the second conductive connecting rod 6 by bolts.

[0065] Preferably, the middle positions of the first conductive connecting rod 5 and the second conductive connecting rod 6 are on the same horizontal line.

[0066] In one embodiment, in combination Figure 1-Figure 6 A spring is arranged between the first conductive link 5 and the second conductive link 6. When the vacuum load switch of the present invention is in an opening or closing state, the spring can keep the positions of the first conductive link 5 and the second conductive link 6 unchanged.

[0067] Furthermore, when the vacuum load switch of the present invention is in the open state, the spring can also overcome the influence of the self-closing force of the vacuum interrupter 1.

[0068] The setting of the spring can effectively improve the short-circuit closing ability of the switch.

[0069] In one embodiment;

[0070] Combination Figure 1-Figure 6 The vacuum load switch of the present invention further comprises a static connecting rod 13 and a dynamic connecting rod 14;

[0071] The static connecting rod 13 electrically connects the static contact 11 with the conductive busbar 7, and the moving connecting rod 14 electrically connects the moving contact 12 with the second conductive connecting rod 6, which can ensure the stability of current transmission, reduce resistance and arc generation caused by poor connection, and withstand the mechanical stress and thermal stress generated during current transmission, thereby ensuring the stability and durability of the switch in long-term use.

[0072] Preferably, the movable connecting rod 14 and the second conductive connecting rod 6 are rotatably connected by bolts.

[0073] In one embodiment, in combination Figure 4 The vacuum load switch of the present invention further comprises a base 9 for limiting the limit position of the moving conductive blade 2 .

[0074] In summary, the vacuum load switch of the present invention has a simple transmission structure and has functions such as opening and closing retention. It can not only ensure the stability of current transmission and reduce the resistance and arc generation caused by poor connection, but also solve the problems of complex structure, high failure probability, poor robustness, insufficient short-circuit closing capacity, etc. of existing vacuum load switches, and further optimize the current transmission path, reduce the generation of resistance and arc, thereby improving the efficiency of current transmission and the stability and reliability of the switch.

[0075] In one embodiment;

[0076] like Figure 1 FIG. 1 is an overall schematic diagram of the vacuum load switch of the present invention in a closed state. Figure 2 This is a schematic diagram of the vacuum load switch of the present invention at the initial stage of the opening action. Figure 3 It is a schematic diagram of the vacuum load switch of the present invention in the middle stage of the opening action. Figure 4 It is a schematic diagram of the vacuum load switch of the present invention at the stage of completing the opening action.

[0077] The opening process of the vacuum load switch of the present invention and the flow direction of the current are as follows:

[0078] When the vacuum load switch of the present invention is in Figure 1In the closed state, the current flows through the conductive busbar 7, the static conductive blade 3, the dynamic conductive blade 2 in sequence, and finally flows to the conductive seat 4. At this time, no current flows in the vacuum interrupter 1.

[0079] like Figure 2 As shown, the vacuum load switch of the present invention starts to perform the opening operation, and the moving conductive blade 2 rotates counterclockwise around the axis of the connection between it and the conductive seat 4. When the moving conductive blade 2 just contacts the first conductive connecting rod 5, and the moving conductive blade 2 also contacts the static conductive blade 3 at the same time, the current has two flow paths:

[0080] First, the current flows through the conductive busbar 7, the static conductive blade 3, the dynamic conductive blade 2 in sequence, and finally flows to the conductive seat 4;

[0081] The second one is that the current flows through the conductive busbar 7, the vacuum interrupter 1, the second conductive connecting rod 6 and the conductive connecting mechanism 8, the first conductive connecting rod 5, the movable conductive blade 2 in sequence, and finally flows to the conductive seat 4.

[0082] At this time, part of the current flows through the vacuum interrupter 1, and the stationary contact 11 and the moving contact 12 are not separated yet.

[0083] Then, if Figure 3 As shown, the movable conductive blade 2 continues to rotate counterclockwise, driving the first conductive link 5 to rotate clockwise around the axis, thereby driving the second conductive link 6 to rotate counterclockwise around the axis under the force, thereby driving the movable contact 12 to move downward through the movable link 14. When the movable conductive blade 2 is completely disconnected from the static conductive blade 3 and is only connected to the first conductive link 5, the current flows through the conductive busbar 7, the vacuum interrupter 1, the second conductive link 6 and the conductive connection mechanism 8, the first conductive link 5, the movable conductive blade 2 in sequence, and finally flows to the conductive seat 4.

[0084] At this time, the static contact 11 and the moving contact 12 in the vacuum interrupter 1 begin to separate, and the current completely flows through the vacuum interrupter 1, and the current is transferred.

[0085] Then, the movable conductive blade 2 continues to rotate counterclockwise, and when the movable conductive blade 2 is completely disconnected from the first conductive link 5 (that is, the movable conductive blade 2 is separated from the first conductive link 5 to a safe distance), the first conductive link 5 continues to rotate under the action of inertia, driving the second conductive link 6 to rotate, and then driving the movable link 14 to further increase the distance between the movable contact 12 and the static contact 11, and move to Figure 4 In the position shown, the movable conductive blade 2 contacts the base 9 and stops moving.

[0086] At this time, the moving contact 12 and the static contact 11 are separated by a certain distance, the arc is extinguished in the vacuum interrupter 1, and the spring between the first conductive link 5 and the second conductive link 6 overcomes the self-closing force in the vacuum interrupter 1, so that the positions of the first conductive link 5 and the second conductive link 6 remain unchanged, and the vacuum load switch of the present invention completes the opening operation.

[0087] like Figure 5 The figure shows a schematic diagram of the vacuum load switch of the present invention in the middle stage of the closing action. Figure 6 It is a schematic diagram of the vacuum load switch of the present invention at the stage of completing the closing action.

[0088] The closing process of the vacuum load switch of the present invention and the flow direction of the current are as follows:

[0089] When the vacuum load switch of the present invention is closed, the movable conductive blade 2 rotates clockwise to move to the position as shown in FIG. Figure 5 In the position shown, the movable conductive blade 2 contacts the first conductive link 5, and the movable conductive blade 2 will hit the first conductive link 5, causing it to start rotating counterclockwise around its axis, driving the second conductive link 6 to rotate clockwise around its axis, thereby driving the movable contact 12 to start moving upward through the movable link 14.

[0090] The moving conductive blade 2 continues to rotate clockwise, driving the first conductive link 5 to continue to rotate counterclockwise, and then the moving contact 12 is driven by the moving link 14 to move upward for a certain distance, and current begins to flow in the vacuum interrupter 1. Figure 6 In the position shown, the dynamic conductive blade 2 is in contact with the static conductive blade 3 and the first conductive connecting rod 5 at the same time, and there are two current flow paths:

[0091] First, the current flows through the conductive busbar 7, the static conductive blade 3, the dynamic conductive blade 2 in sequence, and finally flows to the conductive seat 4;

[0092] Second, the current flows through the conductive busbar 7, the vacuum interrupter 1, the second conductive connecting rod 6 and the conductive connecting mechanism 8, the first conductive connecting rod 5, the conductive blade 2 in sequence, and finally flows to the conductive seat 4.

[0093] When the movable conductive blade 2 continues to rotate, it moves to Figure 1 In the position shown, the moving conductive blade 2 is completely disconnected from the first conductive connecting rod 5, and the static contact 11 and the moving contact 12 in the vacuum interrupter 1 are in contact. At this time, the current has only the first flow path, and the current flows through the conductive busbar 7, the static conductive blade 3, the moving conductive blade 2 in sequence, and finally flows to the conductive seat 4.

[0094] At this time, no current flows through the vacuum interrupter 1, and the first conductive connecting rod 5 and the second conductive connecting rod 6 keep their positions unchanged under the action of the spring, and the vacuum load switch of the present invention completes the closing.

[0095] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A vacuum load switch, characterized in that: include: A vacuum interrupter chamber, wherein a static contact and a moving contact are arranged in the vacuum interrupter chamber; The conductive structure can be operated to control the disconnection / connection of the moving contact and the static contact, thereby realizing the opening / closing of the vacuum type load switch.

2. The vacuum load switch according to claim 1, characterized in that: The conductive structure comprises: a movable conductive blade, a static conductive blade, a conductive seat, a first conductive connecting rod, a second conductive connecting rod and a conductive busbar; The static contact is electrically connected to the conductive busbar, the movable contact is rotatably and electrically connected to one end of the second conductive link, the other end of the second conductive link is movably connected to the first conductive link to allow the other end of the second conductive link to be able to slide relative to the first conductive link and to be able to rotate and be electrically connected relative to the first conductive link, the movable conductive blade is rotatably connected to the conductive seat, the movable conductive blade rotates around the conductive seat and contacts the first conductive link, and the static conductive blade is fixedly connected to the conductive busbar.

3. The vacuum type load switch according to claim 2, characterized in that: The conductive structure further comprises a conductive connection mechanism; The upper part of the conductive connection mechanism is connected to the shell of the vacuum arc extinguishing chamber, one end of the lower part of the conductive connection mechanism is rotatably connected to the first conductive connecting rod, and the other end of the lower part of the conductive connection mechanism is rotatably connected to the second conductive connecting rod.

4. The vacuum type load switch according to claim 3, characterized in that: A spring is arranged between the first conductive connecting rod and the second conductive connecting rod.

5. The vacuum type load switch according to claim 2, characterized in that: The vacuum type load switch also includes a static connecting rod and a dynamic connecting rod; The static connecting rod electrically connects the static contact with the conductive busbar; The moving link electrically connects the moving contact and the second conductive link.

6. The vacuum load switch according to claim 2, characterized in that: A conductive column is provided on one of the first conductive link and the second conductive link, and a long slot is provided on the other, wherein the conductive column is arranged in the long slot, so that the other end of the second conductive link can both slide and rotate relative to the first conductive link.

7. The vacuum type load switch according to claim 2, characterized in that: The portion of the movable conductive blade used for contacting the first conductive connecting rod is configured as an arc-shaped contact surface; and / or The portion of the first conductive link used for contacting the movable conductive blade is configured as an arc-shaped contact surface.

8. The vacuum load switch according to claim 2, characterized in that: The vacuum type load switch also includes a base; The base is used to limit the limit position of the dynamic conductive blade.

9. The vacuum type load switch according to claim 5, characterized in that: The movable connecting rod and the second conductive connecting rod are rotatably connected by bolts.

10. The vacuum type load switch according to claim 3, characterized in that: The conductive connection mechanism is connected to the middle position of the first conductive connecting rod and the middle position of the second conductive connecting rod by bolts.

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