Switching device

Abstract

To provide a switch that can easily achieve high-speed operation. [Solution] In the opening and closing device of the embodiment, the transmission mechanism transmits the driving force of the operating mechanism to the second contact part via the first contact part such that when a closing operation is performed, the second contact part approaches the first contact part, and when an opening operation is performed, the second contact part moves away from the first contact part. The transmission mechanism has a reversing lever, a connecting link, and a pivot lever. One end of the reversing lever is rotatably connected to the second contact part. The other end of the reversing lever and one end of the connecting link are rotatably connected. The other end of the connecting link is rotatably connected to the first contact part. One end of the pivot lever is rotatably connected to the sealed container. The other end of the pivot lever is rotatably connected to the pivot part of the reversing lever.

Description

Technical Field

[0001] Embodiments of the present invention relate to an opening and closing device.

Background Art

[0002] An opening and closing device is installed in an electric power system and is used to interrupt a delayed load current such as an accident current, an advancing small current, a reactor interruption, etc. in the electric power system.

[0003] The opening and closing device is, for example, a puffer-type gas circuit breaker, in which a movable-side contact portion and a counter-side contact portion are arranged to face each other inside a sealed container filled with arc-extinguishing gas. When the movable-side contact portion is driven, a closing operation (closing operation) and an opening operation (interrupting operation) are executed. The movable-side contact portion includes a movable-side arc contact and a movable-side energizing contact, and the counter-side contact portion includes a counter-side arc contact and a counter-side energizing contact.

[0004] In a gas circuit breaker, when a closing operation is executed, the movable-side arc contact and the counter-side arc contact come into contact with each other, and at the same time, the movable-side energizing contact and the counter-side energizing contact come into contact with each other, and the circuit becomes energized (closed state). Then, in the gas circuit breaker, when an opening operation is executed, the counter-side arc contact and the movable-side arc contact are separated from each other, and at the same time, the counter-side energizing contact and the movable-side energizing contact are separated from each other, and the circuit becomes in an interrupted state. In a puffer-type gas circuit breaker, in the interrupting process of changing the circuit from an energized state to an interrupted state during an opening operation, arc-extinguishing gas is blown onto the arc discharge generated between the counter-side arc contact and the movable-side arc contact, and the arc discharge is extinguished. As a result, interruption occurs at the current zero point.

[0005] The operating mechanism for driving the movable-side contact portion is, for example, a spring operating mechanism that uses the biasing force of a spring. The spring operating mechanism is superior in maintainability and reliability compared to a hydraulic operating mechanism, but has a low driving energy. Therefore, when using a spring operating mechanism, in order to execute operations such as interrupting operations and closing operations at high speed, it is necessary to reduce the size and weight of the movable-side contact portion. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Special Publication No. 7-109744 [Patent Document 2] Japanese Patent Publication No. 2004-119315 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] To enable high-speed operation with low driving energy, a technology has been proposed in which a transmission mechanism connects the movable contact and the opposing contact, transmitting the driving energy required for operation to both the movable and opposing contacts. In this case, the transmission mechanism causes the opposing contact to move in the opposite direction to the movement of the movable contact, thus increasing the speed of the switchgear's operation.

[0008] However, the driving force used to propel the opposing contact is used to move the opposing contact, but it may act in a direction perpendicular to the direction of movement of the opposing contact. As a result, the component perpendicular to the direction of movement of the opposing contact may increase the frictional force on the sliding parts of the movable contact and the opposing contact, making smooth operation difficult. Consequently, it may become difficult to increase the speed of the opening and closing device.

[0009] Therefore, the problem that the present invention aims to solve is to provide an opening / closing device that can easily achieve high-speed operation. [Means for solving the problem]

[0010] The opening and closing device of the embodiment comprises a sealed container, a first contact part, a second contact part, an operating mechanism, and a transmission mechanism, and performs a closing operation to close the electrical circuit from an open state to a closed state, and an opening operation to open the electrical circuit from a closed state to an open state. The first contact part is housed inside the sealed container. The second contact part is installed inside the sealed container so as to be opposite the first contact part. The operating mechanism drives the first contact part so that it approaches the second contact part when performing a closing operation, and moves away from the second contact part when performing an opening operation. The transmission mechanism transmits the driving force of the operating mechanism to the second contact part via the first contact part so that it approaches the first contact part when performing a closing operation, and moves away from the first contact part when performing an opening operation. The transmission mechanism has a reversing lever, a connecting link, and a pivot lever. The reversing lever includes one end of the reversing lever, the other end of the reversing lever located opposite to the one end of the reversing lever, and a pivot point of the reversing lever located between the one end and the other end of the reversing lever. The connecting link includes one end of the connecting link and the other end of the connecting link located opposite to the one end of the connecting link. The pivot lever includes one end of the pivot lever and the other end of the pivot lever located opposite to the one end of the pivot lever. The one end of the reversing lever is rotatably connected to the second contact point. The other end of the reversing lever and one end of the connecting link are rotatably connected. The other end of the connecting link is rotatably connected to the first contact part. One end of the pivot lever is rotatably connected to the sealed container. The other end of the pivot lever is rotatably connected to the pivot part of the reversing lever. [Brief explanation of the drawing]

[0011] [Figure 1A] Figure 1A is a schematic cross-sectional view showing the configuration of the switchgear in the first embodiment (closed state (energized state)). [Figure 1B] Figure 1B is a schematic cross-sectional view showing the state of the opening (closing) operation in the opening / closing device of the first embodiment (closing process). [Figure 1C]Figure 1C is a schematic cross-sectional view showing the state of the opening / closing device in the first embodiment when an opening operation (closing operation) is performed (open state (closed state)). [Figure 2A] Figure 2A is a schematic cross-sectional view showing the configuration of the switchgear in the second embodiment (closed state (energized state)). [Figure 2B] Figure 2B is a schematic cross-sectional view showing the state of the opening (closing) operation in the opening / closing device of the second embodiment (closing process). [Figure 2C] Figure 2C is a schematic cross-sectional view showing the state of the opening / closing device in the second embodiment when an opening operation (closing operation) is performed (open state (closed state)). [Modes for carrying out the invention]

[0012] <First Embodiment> [A] Configuration of the switchgear Figure 1A is a schematic cross-sectional view showing the configuration of the switchgear in the first embodiment. In Figure 1A, the vertical direction is direction z, the horizontal direction is direction x, and the direction perpendicular to the plane of the paper is direction y, which is perpendicular to directions z and x. Figure 1A shows the switchgear in the closed state (energized state).

[0013] As shown in Figure 1A, the switchgear of this embodiment is a puffer-type gas circuit breaker and comprises a sealed container 1, a movable side unit 10, an opposing side unit 20, an operating mechanism 30, and a transmission mechanism 40. The switchgear of this embodiment is configured to perform a closing operation to change the electrical circuit from an open state (interrupted state) to a closed state (energized state), and an opening operation to change the electrical circuit from a closed state to an open state. Each part constituting the switchgear will be described in turn.

[0014] [A-1] Sealed container 1 The sealed container 1 is made of a metallic material and is grounded. Although not shown in the drawings, each of a pair of electric wires forming an electric circuit is connected to each of the movable-side unit 10 and the opposing-side unit 20. Each of the pair of electric wires is supported by each of a pair of spacers, and the space between each electric wire and the sealed container 1 is electrically insulated by the spacers.

[0015] The inside of the sealed container 1 is filled with an arc-extinguishing gas. Here, the arc-extinguishing gas is a gas having excellent arc-extinguishing performance and insulation performance, and for example, sulfur hexafluoride gas (SF6 gas), air, carbon dioxide, oxygen, nitrogen, or a mixed gas thereof. The arc-extinguishing gas preferably has a lower global warming potential and a smaller molecular weight than sulfur hexafluoride gas, and is a gas that is in the gas phase at at least 1 atmospheric pressure or more and 20 degrees Celsius or less.

[0016] [A-2] Movable-side unit 10 The movable-side unit 10 is housed inside the sealed container 1. The movable-side unit 10 includes an operating rod 101, a cylinder 102, a piston 103, a movable-side contact portion 105, and an insulating nozzle 109. In the movable-side unit 10, each of the operating rod 101, the cylinder 102, the piston 103, and the movable-side contact portion 105 is formed of, for example, a metallic material and is electrically connected to an electric wire (not shown) supported by one of a pair of insulators.

[0017] [A-2-1] Operating rod 101 The operating rod 101 is, for example, a cylindrical tubular body. The operating rod 101 is connected to the operating mechanism 30 via an insulating rod 301. The axial direction of the operating rod 101 is along, for example, the direction x, and is configured to move along the axial direction by the operating mechanism 30.

[0018] [A-2-2] Cylinder 102 The cylinder 102 includes a cylinder cylindrical portion 121 and a cylinder bottom plate portion 122.

[0019] The cylinder portion 121 is, for example, a cylindrical tubular body. The inner diameter of the cylinder portion 121 is larger than the outer diameter of the operating rod 101, and the operating rod 101 is housed inside the cylinder portion 121. The cylinder portion 121 is arranged coaxially with the operating rod 101.

[0020] The cylinder bottom plate portion 122 is, for example, a disc-shaped plate, and is provided at the end of the cylinder cylindrical portion 121 on the side where the opposing unit 20 is located. The operating rod 101 passes through the center of the cylinder bottom plate portion 122. A discharge port H102 is also formed in the cylinder bottom plate portion 122. The discharge port H102 passes through the operating rod 101 in the axial direction.

[0021] The cylinder 102 and the operating rod 101 are fixed together, and they are electrically connected. The cylinder 102 is configured to slide together with the operating rod 101 in the axial direction of the operating rod 101 by the operating mechanism 30.

[0022] [A-2-3] Piston 103 The piston 103 is housed inside the cylinder 102.

[0023] The piston 103 is, for example, an annular body and is arranged coaxially with the operating rod 101. The outer diameter of the piston 103 is the same as the inner diameter of the cylinder 102, the operating rod 101 passes through the piston 103, and the operating rod 101 is axially slidable relative to the piston 103.

[0024] The piston 103 partitions the interior of the cylinder 102 in the axial direction. The space located inside the cylinder 102 on the side of the opposing unit 20 relative to the piston 103 is the mechanical puffer chamber PR.

[0025] The mechanical puffer chamber PR is configured such that its volume changes as the cylinder 102 moves axially together with the operating rod 101. As will be described in detail later, during the shutoff process, the volume of the mechanical puffer chamber PR decreases, causing the pressure of the arc-extinguishing gas introduced into the mechanical puffer chamber PR to increase. The arc-extinguishing gas, whose pressure has increased in the mechanical puffer chamber PR, is then released from the mechanical puffer chamber PR through the outlet H102 of the cylinder 102.

[0026] The piston 103 is supported by a piston support 107. Although not shown in the illustration, it is fixed to the sealed container 1 via the piston support 107. The piston support 107 is, for example, a cylindrical tubular body and is arranged coaxially with the operating rod 101. The inner diameter of the piston support 107 is larger than the outer diameter of the operating rod 101, and the outer diameter of the piston support 107 is smaller than the inner diameter of the piston 103. The piston support 107 is, for example, integrally formed with the piston 103.

[0027] [A-2-4] Movable contact part 105 The movable contact portion 105 (first contact portion) has a movable arc contact 11 and a movable energized contact 12, and is configured to slide axially together with the operating rod 101 by the operating mechanism 30.

[0028] [A-2-4-1] Movable side arc contact 11 The movable arc contact 11 is, for example, a cylindrical tubular body and is arranged coaxially with the operating rod 101. Here, the movable arc contact 11 is connected to the end of the operating rod 101 that is located on the side of the opposing unit 20, and is electrically connected to the operating rod 101. The movable arc contact 11 has, for example, the same diameter as the operating rod 101.

[0029] In the movable arc contact 11, the tip portion located on the opposing unit 20 side is configured to bulge inward. The tip portion of the movable arc contact 11 may be divided into multiple circumferential sections and configured as a flexible finger-shaped electrode.

[0030] [A-2-4-2] Movable side energized contact 12 The movable energizing contact 12 is, for example, a cylindrical tubular body and is arranged coaxially with the operating rod 101.

[0031] The movable energized contact 12 includes a portion that houses the insulating nozzle 109 and the movable arc contact 11. The movable energized contact 12 is fixed to the cylinder bottom plate 122 of the cylinder 102 so as to surround the insulating nozzle 109 and the movable arc contact 11, and is electrically connected to the cylinder 102.

[0032] Here, the movable-side energized contact 12 is configured such that its inner diameter is the same as the outer diameter of the portion of the insulating nozzle 109 located on the side of the operating mechanism 30.

[0033] [A-2-5] Insulated nozzle 109 The insulating nozzle 109 is formed of an insulating material. The insulating nozzle 109 is, for example, a cylindrical tubular body and is arranged coaxially with the operating rod 101 inside the sealed container 1.

[0034] The insulating nozzle 109 is fixed to the cylinder 102 and moves together with the cylinder 102 by the operating mechanism 30. The insulating nozzle 109 is configured such that, during the shutoff process, the arc-extinguishing gas whose pressure has risen in the mechanical puffer chamber PR is released from the mechanical puffer chamber PR, thereby extinguishing the arc discharge generated during the shutoff process. In other words, the insulating nozzle 109 and the mechanical puffer chamber PR function as gas flow generating means.

[0035] The nozzle internal space R109 of the insulating nozzle 109 includes a first nozzle internal space R109a, a second nozzle internal space R109b, and a third nozzle internal space R109c. The first nozzle internal space R109a, the second nozzle internal space R109b, and the third nozzle internal space R109c are arranged sequentially in the axial direction from the side of the movable unit 10 to the side of the opposing unit 20, and are in communication with each other.

[0036] The first nozzle internal space R109a houses the movable arc contact 11. A gap exists between the insulating nozzle 109 and the movable arc contact 11 in the first nozzle internal space R109a. The second nozzle internal space R109b is configured to have a smaller inner diameter than the first nozzle internal space R109a. The third nozzle internal space R109c is configured to have a larger inner diameter than the second nozzle internal space R109b.

[0037] [A-3] Opposite side unit 20 The opposing unit 20 is housed inside the sealed container 1. The opposing unit 20 is installed inside the sealed container 1 so as to be aligned opposite the movable unit 10.

[0038] The opposing unit 20 comprises a support cylinder 201, a support 202, and an opposing contact portion 205. In the opposing unit 20, the support cylinder 201, the support 202, and the opposing contact portion 205 are each formed of, for example, a metal material and are electrically connected to an electric wire (not shown) supported by the other insulator of a pair of insulators.

[0039] [A-3-1] Support tube 201 The support cylinder 201 is, for example, a cylindrical tubular body, and is arranged coaxially with the operating rod 101 inside the sealed container 1. Although not shown in the illustration, the support cylinder 201 is supported by the sealed container 1 inside the sealed container 1.

[0040] [A-3-2] Support 202 The support 202 includes a support plate portion 221 and a support rod portion 222, and is housed inside the support cylinder 201. The support 202 is constructed, for example, by stacking multiple conductive plates.

[0041] The support plate portion 221 is, for example, a disc-shaped plate, and is arranged coaxially with the support cylinder 201.

[0042] The support rod portion 222 is, for example, a cylindrical rod-shaped body that extends in the axial direction. The support rod portion 222 is arranged coaxially with the support cylinder 201. The support rod portion 222 is provided on the support plate portion 221 on the side opposite to the movable unit 10.

[0043] [A-3-3] Opposing contact part 205 The opposing contact portion 205 (second contact portion) comprises an opposing arc contact 21 and an opposing energized contact 22.

[0044] [A-3-3-1] Opposing arc contact 21 The opposing arc contact 21 is, for example, a cylindrical rod-shaped body and is coaxial with the support cylinder 201.

[0045] The opposing arc contact 21 extends axially and is supported by the support 202 inside the support cylinder 201. Specifically, the opposing arc contact 21 is fixed to the surface of the support plate portion 221 that constitutes the support 202 that is located on the side of the movable unit 10. The opposing arc contact 21 may be formed integrally with the support 202.

[0046] The tip of the opposing arc contact 21, located on the side of the movable unit 10, is curved and rounded.

[0047] As shown in Figure 1A, when the switchgear is in the closed state (energized state), the opposing arc contact 21 is inserted into the nozzle internal space R109 of the insulating nozzle 109. The outer diameter of the opposing arc contact 21 is, for example, the same as the second nozzle internal space R109b, and smaller than the inner diameters of the first nozzle internal space R109a and the third nozzle internal space R109c.

[0048] Furthermore, the outer diameter of the opposing arc contact 21 is the same as, for example, the inner diameter of the tip portion of the movable arc contact 11. As shown in Figure 1A, when the switching device is in the closed state (energized state), the inner circumferential surface of the movable arc contact 11 and the outer circumferential surface of the opposing arc contact 21 are in contact, and the two are electrically connected.

[0049] [A-3-3-2] Opposite side energized contact 22 The opposing energized contact 22 is, for example, a cylindrical tubular body and is arranged coaxially with the support cylinder 201.

[0050] The opposing energized contact 22 is supported by the support 202. The opposing energized contact 22 houses the support plate portion 221 that constitutes the support 202 and is fixed to the outer circumferential surface of the support plate portion 221.

[0051] Of the opposing energized contact 22, the portion located on the side of the movable unit 10 protrudes outward from the support cylinder 201. The tip of the portion of the opposing energized contact 22 located on the side of the movable unit 10 is configured to bulge inward.

[0052] The portion of the opposing energized contact 22 that is located on the side opposite to the movable unit 10 is housed inside the support cylinder 201. Here, the outer diameter of the opposing energized contact 22 is approximately the same as the inner diameter of the support cylinder 201, and the opposing energized contact 22 is configured to slide axially together with the support 202 inside the support cylinder 201.

[0053] In this embodiment, a sliding lubrication portion 211 is embedded in the portion of the inner circumferential surface of the support cylinder 201 that abuts against the outer circumferential surface of the opposing energized contact 22. The sliding lubrication portion 211 has a surface friction coefficient lower than that of the support cylinder 201, for example, so that the opposing energized contact 22 slides smoothly on the inner circumferential surface of the support cylinder 201. The sliding lubrication portion 211 is made of a conductor and electrically connects the support cylinder 201 and the opposing energized contact 22. Furthermore, the sliding lubrication portion 211 may be configured to be elastically deformable in response to the sliding of the opposing energized contact 22.

[0054] The inner diameter of the tip portion of the opposing energized contact 22 is, for example, the same as the outer diameter of the movable energized contact 12. As shown in Figure 1A, when the switching device is in the closed state (energetic state), the outer circumferential surface of the movable energized contact 12 and the inner circumferential surface of the opposing energized contact 22 are in contact, and the two are electrically connected.

[0055] [A-4] Operating mechanism 30 The operating mechanism 30 is installed outside the sealed container 1. The operating mechanism 30 is, for example, a spring operating mechanism that utilizes a biasing force from a spring and is configured to drive the movable contact part 105.

[0056] In this embodiment, the operating mechanism 30 moves the piston 103 and the insulating nozzle 109 in the axial direction together with the movable contact part 105 by operating the operating rod 101 in the axial direction.

[0057] Specifically, when the operating mechanism 30 performs a closing operation, it operates so that the movable contact portion 105 approaches the opposing contact portion 205. As a result, the movable arc contact 11 and the opposing arc contact 21 come into contact, and the movable energized contact 12 and the opposing energized contact 22 come into contact, resulting in a closed state (energetic state) where the movable contact portion 105 and the opposing contact portion 205 are electrically connected.

[0058] In response to this, when the operating mechanism 30 performs an opening operation, it operates so that the movable contact portion 105 separates from the opposing contact portion 205. As a result, the movable arc contact 11 and the opposing arc contact 21 are separated, and the movable energized contact 12 and the opposing energized contact 22 are separated, resulting in an electrically insulated open state (disconnected state) between the movable contact portion 105 and the opposing contact portion 205.

[0059] [A-5] Transmission mechanism 40 The transmission mechanism 40 includes a coupling member 401, a reversing lever 41, a connecting link 42, and a pivot lever 43, and is configured to transmit the driving force of the operating mechanism 30 to the opposing contact part 205 via the movable contact part 105.

[0060] [A-5-1] Coupling member 401 In the transmission mechanism 40, the coupling member 401 is, for example, a cylindrical rod. The coupling member 401 passes through the support plate portion 221 that constitutes the support 202 so as to be along the axial direction. One end of the coupling member 401 that is located on the side of the operating mechanism 30 is fixed to, for example, the insulating nozzle 109. The coupling member 401 is configured to slide in the axial direction as the insulating nozzle 109, etc., moves in the axial direction by the operating mechanism 30.

[0061] [A-5-2] Reversal lever 41 In the transmission mechanism 40, the reversing lever 41 is, for example, a plate-shaped body and includes one end 41A of the reversing lever and the other end 41B of the reversing lever located on the opposite side of the one end 41A. In addition, the reversing lever 41 includes a pivot point 41C of the reversing lever. The pivot point 41C of the reversing lever is located between the one end 41A of the reversing lever and the other end 41B of the reversing lever. The reversing lever 41 penetrates a support cylinder opening K201 formed on the circumferential surface of the support cylinder 201, with the one end 41A of the reversing lever located inside the support cylinder 201 and the other end 41B of the reversing lever located outside the support cylinder 201.

[0062] [A-5-3] Linking link 42 In the transmission mechanism 40, the connecting link 42 is, for example, a plate-shaped body and includes one end 42A of the connecting link and the other end 42B of the connecting link located on the opposite side of the one end 42A of the connecting link. The connecting link 42 penetrates a support cylinder opening K201 formed on the circumferential surface of the support cylinder 201, with the other end 42B of the connecting link located inside the support cylinder 201 and the one end 42A of the connecting link located outside the support cylinder 201.

[0063] [A-5-4] Pivot lever 43 In the transmission mechanism 40, the pivot lever 43 includes one end 43A of the pivot lever and the other end 43B of the pivot lever located on the opposite side of the one end 43A of the pivot lever. The pivot lever 43 is located inside the portion of the support cylinder 201 in which the support cylinder opening K201 is formed.

[0064] [A-5-5] Connection of each end One end 41A of the reversal lever is rotatably connected to the opposing contact portion 205 via the support 202. Here, the one end 41A of the reversal lever is rotatably connected to the end of the support rod portion 222 that constitutes the support 202, which is located on the side opposite to the operating mechanism 30.

[0065] Furthermore, the other end 41B of the reversal lever and the one end 42A of the connecting link are rotatably connected.

[0066] Furthermore, the other end 42B of the connecting link is rotatably connected to the movable contact portion 105 via the coupling member 401. Here, the other end 42B of the connecting link is rotatably connected to the end of the coupling member 401 that is located on the side opposite to the operating mechanism 30.

[0067] One end 43A of the pivot lever is rotatably connected to the support cylinder 201. The other end 43B of the pivot lever is rotatably connected to the pivot portion 41C of the reversing lever.

[0068] Each of the reversing lever end 41A, the other end 41B, the connecting link end 42A, the other end 42B, the pivot lever end 43A, and the other end 43B is designed to rotate about a rotation axis perpendicular to the axial direction (direction y in the figure).

[0069] [B] Operation of the switchgear The operation of the opening / closing device in this embodiment will be described in detail.

[0070] [B-1] Closing operation (closing operation) First, let's explain the closing operation (closing operation). The closing operation is performed when the control device (not shown) controls the operation of the operating mechanism 30 based on the closing command.

[0071] After the closing operation is performed in the switchgear, the switchgear enters a closed state (energized state), as already shown in Figure 1A.

[0072] When the switchgear is in the closed state, the movable arc contact 11 and the opposing arc contact 21 are in contact, as are the movable energized contact 12 and the opposing energized contact 22. When the switchgear is in the closed state, the support cylinder 201, the opposing energized contact 22, the movable energized contact 12, and the cylinder 102 are electrically connected, and current flows.

[0073] [B-2] Opening operation (shutting off operation) Next, the opening operation (shutting-off operation) will be explained. The opening operation is performed by the control device (not shown) controlling the operation of the operating mechanism 30 based on the shut-off command. The opening operation is performed, for example, to interrupt fault currents.

[0074] Figures 1B and 1C are schematic cross-sectional views illustrating the state of the opening (closing) operation in the opening / closing device of the first embodiment. Figure 1B shows the closing process as the opening (closing) operation is performed and the device is in the open (closed) state. Figure 1C shows the state after the opening (closing) operation is completed and the device is in the open (closed) state.

[0075] As shown in Figures 1B and 1C, when the opening operation is performed in the switchgear to change it from a closed state (energized state) to an open state (disconnected state), the movable energized contact 12 and the opposing energized contact 22 move from a contact state to a separated state. Subsequently, the movable arc contact 11 and the opposing arc contact 21 move from a contact state to a separated state.

[0076] When the movable arc contact 11 and the opposing arc contact 21 separate in the nozzle internal space R109 of the insulating nozzle 109, an arc discharge (not shown) occurs between the movable arc contact 11 and the opposing arc contact 21. In the switchgear, as the opening operation progresses, the cylinder 102 moves around the piston 103. As a result, the volume of the mechanical buffer chamber PR located inside the cylinder 102 decreases, and the pressure of the arc-extinguishing gas introduced into the mechanical buffer chamber PR increases. The arc-extinguishing gas is then injected from the mechanical buffer chamber PR through the outlet H102 into the nozzle internal space R109 of the insulating nozzle 109. Consequently, the arc discharge (not shown) generated between the movable arc contact 11 and the opposing arc contact 21 in the nozzle internal space R109 is extinguished by the arc-extinguishing gas injected from the outlet H102. The arc discharge extinguishes when the current reaches zero, and the opening operation is completed.

[0077] In the opening and closing device of this embodiment, the transmission mechanism 40 transmits the driving force of the operating mechanism 30 to the opposing contact part 205 via the movable contact part 105, as described above. As a result, in this embodiment, when the opening operation is performed, the movable contact part 105 moves axially toward the side of the operating mechanism 30 (right side in the figure), while the opposing contact part 205 moves axially toward the opposite side from the side of the operating mechanism 30 (left side in the figure).

[0078] [B-2-1] Operation of coupling member 401 In the transmission mechanism 40, as the movable contact portion 105 moves, the coupling member 401 moves axially toward the operating mechanism 30, and the other end 42B of the connecting link 42 connected to the coupling member 401 also moves axially toward the operating mechanism 30.

[0079] [B-2-2] Operation of the reversal lever 41 In the transmission mechanism 40, the reversing lever 41 rotates counterclockwise (first rotation direction) around the point where the other end 43B of the pivot lever and the pivot portion 41C of the reversing lever are rotatably connected, as the other end 42B of the connecting link moves. As a result, the other end 41B of the reversing lever moves toward the operating mechanism 30, and the one end 41A of the reversing lever moves toward the opposite side from the operating mechanism 30.

[0080] As one end 41A of the reversing lever moves, the support 202 moves axially away from the side of the operating mechanism 30. As a result, the opposing contact portion 205 supported by the support 202 also moves axially away from the side of the operating mechanism 30. In other words, axially, the opposing contact portion 205 moves away from the movable contact portion 105.

[0081] [B-2-3] Operation of the connecting link 42 In the transmission mechanism 40, the connecting link 42 rotates as the coupling member 401 moves, with the other end of the connecting link 42B rotatably connected to the support 202 as the axis of rotation.

[0082] Here, the connecting link 42 first rotates counterclockwise around the point where the other end 42B of the connecting link is rotatably connected to the support 202. As a result, one end 42A of the connecting link 42 moves axially toward the operating mechanism 30 and radially from the inside to the outside (see Figures 1A and 1B).

[0083] Subsequently, the connecting link 42 rotates and moves in a clockwise direction (second rotation direction), opposite to the counterclockwise direction, with the portion where the other end 42B of the connecting link is rotatably connected to the support 202 as the axis of rotation. As a result, in the connecting link 42, one end 42A of the connecting link moves toward the operating mechanism 30 in the axial direction and moves radially from the outside to the inside (see Figures 1B and 1C).

[0084] [B-2-4] Operation of the pivot lever 43 In the transmission mechanism 40, the pivot lever 43 rotates around the pivot point axis as the coupling member 401 moves, with the part of the pivot lever 43A that is rotatably connected to the support cylinder 201 being the pivot point axis.

[0085] Here, the pivot lever 43 first rotates counterclockwise around the point where one end 43A of the pivot lever is rotatably connected to the support cylinder 201. As a result, the other end 43B of the pivot lever 43 moves radially from the inside to the outside (see Figures 1A and 1B).

[0086] Subsequently, the pivot lever 43 rotates and moves in a clockwise direction, opposite to the counterclockwise direction, with the portion where one end 43A of the pivot lever is rotatably connected to the support cylinder 201 as the axis of rotation. As a result, the other end 43B of the pivot lever 43 moves radially from the outside to the inside (see Figures 1B and 1C).

[0087] [C] Summary As described above, the opening and closing device of this embodiment is provided with a transmission mechanism 40 that transmits the driving force of the operating mechanism 30 to the opposing contact part 205 via the movable contact part 105. The transmission mechanism 40 transmits the driving force of the operating mechanism 30 to the opposing contact part 205 such that the direction of movement of the opposing contact part 205 is opposite to the direction of movement of the movable contact part 105. Therefore, in this embodiment, even when the driving force of the operating mechanism 30 is relatively low, the relative movement speed of the movable contact part 105 relative to the opposing contact part 205 can be increased.

[0088] In the opening and closing device of this embodiment, the transmission mechanism 40 includes a reversing lever 41, a connecting link 42, and a pivot lever 43, as described above. The reversing lever 41 includes one end 41A of the reversing lever, another end 41B of the reversing lever located on the opposite side of the one end 41A of the reversing lever, and a pivot portion 41C of the reversing lever located between the one end 41A and the other end 41B of the reversing lever. The connecting link 42 includes one end 42A of the connecting link and another end 42B of the connecting link located on the opposite side of the one end 42A of the connecting link. The pivot lever 43 includes one end 43A of the pivot lever and another end 43B of the pivot lever located on the opposite side of the one end 43A of the pivot lever. Here, one end 41A of the reversing lever is rotatably connected to the opposing contact part 205 via a support 202, the other end 41B of the reversing lever is rotatably connected to one end 42A of the connecting link, and the other end 42B of the connecting link is rotatably connected to the movable contact part 105. Furthermore, one end 43A of the pivot lever is rotatably connected to the sealed container 1 via a support cylinder 201, and the other end 43B of the pivot lever is rotatably connected to the pivot part 41C of the reversing lever.

[0089] In this embodiment, when an opening operation (or closing operation) is performed, the reversing lever 41 in the transmission mechanism 40 rotates with one end 41A of the reversing lever as the center of rotation, so that the other end 41B of the reversing lever moves closer to the movable unit 10. At this time, a force acts on the opposing contact portion 205 via the support 202 in a direction perpendicular to the direction of movement of the opposing contact portion 205 (in this case, the vertical direction). As a result, due to the component in the direction perpendicular to the direction of movement of the opposing contact portion 205, the frictional force on the sliding parts of the movable contact portion 105 and the opposing contact portion 205 increases, which may make smooth operation difficult.

[0090] However, the transmission mechanism 40 of this embodiment includes a pivot lever 43, one end 43A of the pivot lever rotatably connected to the sealed container 1 via a support cylinder 201, and the other end 43B of the pivot lever rotatably connected to the pivot portion 41C of the reversing lever 41. Therefore, in this embodiment, in accordance with the rotation of the reversing lever 41, the pivot lever 43 rotates with the one end 43A of the pivot lever as its pivot center, and the other end 43B of the pivot lever rotates. In other words, the rotation of the pivot lever 43 is caused by the action of a component in a direction perpendicular to the direction of movement of the opposing contact portion 205. As a result, the component in a direction perpendicular to the direction of movement of the opposing contact portion 205 reduces the force acting on the sliding portion of the movable contact portion 105 and the opposing contact portion 205.

[0091] Therefore, in the opening and closing device of this embodiment, it is possible to prevent an increase in frictional force in the sliding part, making it easy to achieve high-speed operation.

[0092] <Second Embodiment> [A] Configuration of the switchgear Figure 2A is a schematic cross-sectional view showing the configuration of the switchgear in the second embodiment. As with Figure 1A, Figure 2A shows the switchgear in the closed state (energized state).

[0093] In the switching device of this embodiment, as shown in Figure 2A, the configuration of the transmission mechanism 40 differs from that of the first embodiment (see Figure 1A). Except for this point and related matters, this embodiment is the same as that of the first embodiment. Therefore, explanations of overlapping matters will be omitted as appropriate.

[0094] In the opening and closing device of this embodiment, the transmission mechanism 40, as shown in Figure 2A, includes a coupling member 401, a reversing lever 41, a connecting link 42 (first connecting link), a pivot lever 43, a connecting link 45 (second connecting link), and a conversion lever 46, and is configured to transmit the driving force of the operating mechanism 30 to the opposing contact part 205 via the movable contact part 105.

[0095] [A-1] Coupling member 401 In the transmission mechanism 40, the coupling member 401 is configured in the same way as in the first embodiment.

[0096] [A-2] Reversal lever 41 In the transmission mechanism 40, the reversing lever 41 is, for example, a plate-shaped body and includes one end 41A of the reversing lever and the other end 41B of the reversing lever located on the opposite side of the one end 41A. In addition, the reversing lever 41 includes a pivot point 41C of the reversing lever. The pivot point 41C of the reversing lever is located between the one end 41A of the reversing lever and the other end 41B of the reversing lever. The reversing lever 41 penetrates a support cylinder opening K201a formed on the circumferential surface of the support cylinder 201, with the one end 41A of the reversing lever located inside the support cylinder 201 and the other end 41B of the reversing lever located outside the support cylinder 201.

[0097] [A-3] Linking link 42 (first linking link) In the transmission mechanism 40, the connecting link 42 (first connecting link) is, for example, a plate-shaped body and includes one end 42A of the connecting link and the other end 42B of the connecting link located on the opposite side of the one end 42A of the connecting link. The connecting link 42 is housed inside the support cylinder 201.

[0098] [A-4] Pivot lever 43 In the transmission mechanism 40, the pivot lever 43 includes one end 43A of the pivot lever and the other end 43B of the pivot lever located on the opposite side of the one end 43A of the pivot lever. The pivot lever 43 is located inside the portion of the support cylinder 201 in which the support cylinder opening K201a is formed.

[0099] [A-5] Linking link 45 (second linking link) In the transmission mechanism 40, the connecting link 45 (second connecting link) includes one end 45A (one end of the second connecting link) and the other end 45B (other end of the second connecting link) located on the opposite side of the one end 45A. The connecting link 45 penetrates the support cylinder opening K201a formed on the circumferential surface of the support cylinder 201, with the one end 45A of the connecting link located inside the support cylinder 201 and the other end 45B of the connecting link located outside the support cylinder 201.

[0100] [A-6] Conversion lever 46 In the transmission mechanism 40, the conversion lever 46 includes one end 46A of the conversion lever and the other end 46B of the conversion lever located on the opposite side of the one end 46A of the conversion lever. The conversion lever 46 also includes a pivot point 46C of the conversion lever located between the one end 46A of the conversion lever and the other end 46B of the conversion lever. In the conversion lever 46, the other end 46B of the conversion lever is housed inside the support cylinder 201.

[0101] [A-7] Connection of each end One end 41A of the reversal lever is rotatably connected to the opposing contact portion 205 via the support 202. Here, the one end 41A of the reversal lever is rotatably connected to the end of the support rod portion 222 that constitutes the support 202, which is located on the side opposite to the operating mechanism 30.

[0102] Furthermore, the other end 41B of the reversing lever and the one end 45A of the connecting link are rotatably connected, and the other end 45B of the connecting link and the pivot point 46C of the conversion lever are also rotatably connected. In addition, the other end 46B of the conversion lever and the other end 42B of the connecting link are rotatably connected.

[0103] Furthermore, the other end 42B of the connecting link is rotatably connected to the movable contact portion 105 via the coupling member 401. Here, the other end 42B of the connecting link is rotatably connected to the end of the coupling member 401 that is located on the side opposite to the operating mechanism 30.

[0104] One end 46A of the conversion lever is rotatably connected to the sealed container 1 in a space located outside the support cylinder 201 within the interior of the sealed container 1.

[0105] One end 43A of the pivot lever is rotatably connected to the support cylinder 201. The other end 43B of the pivot lever is rotatably connected to the pivot portion 41C of the reversing lever.

[0106] Each of the following components is configured to rotate about a rotation axis perpendicular to the axial direction (direction y in the figure): one end 41A of the reversing lever, the other end 41B of the reversing lever, one end 42A of the connecting link, the other end 42B of the connecting link, one end 43A of the pivot lever, the other end 43B of the pivot lever, one end 45A of the connecting link, the other end 45B of the connecting link, one end 46A of the conversion lever, and the other end 46B of the conversion lever.

[0107] [B] Operation of the switchgear The operation of the opening / closing device in this embodiment will be described in detail.

[0108] [B-1] Closing operation (closing operation) First, let's explain the closing operation (closing operation).

[0109] In the switching device of this embodiment, after the closing operation is performed, the switching device enters a closed state (energized state), as already shown in Figure 2A, similar to the case of the first embodiment (see Figure 1A). That is, contact is made between the movable side arc contact 11 and the opposing side arc contact 21, and contact is made between the movable side energized contact 12 and the opposing side energized contact 22. As a result, in the switching device, the support cylinder 201, the opposing side energized contact 22, the movable side energized contact 12, and the cylinder 102 are electrically connected, and current flows.

[0110] [B-2] Opening operation (shutting off operation) Next, we will explain the opening operation (blocking operation).

[0111] Figures 2B and 2C are schematic cross-sectional views illustrating the state of the opening (closing) operation in the opening / closing device of the second embodiment. Figure 2B shows the opening (closing) operation in progress, as in Figure 1B, as the device is in the process of becoming open (closed). Figure 2C shows the state after the opening (closing) operation has been completed and the device is in the open (closed) state, as in Figure 1C.

[0112] As shown in Figures 2B and 2C, when the opening operation is performed in the switching device of this embodiment to change the switching device from a closed state (energized state) to an open state (disconnected state), the movable energized contact 12 and the opposing energized contact 22 move from a contact state to a separated state, similar to the first embodiment. Subsequently, the movable arc contact 11 and the opposing arc contact 21 move from a contact state to a separated state.

[0113] In the opening and closing device of this embodiment, the transmission mechanism 40 transmits the driving force of the operating mechanism 30 to the opposing contact part 205 via the movable contact part 105, similar to the first embodiment. As a result, in this embodiment, when the opening operation is performed, the movable contact part 105 moves axially toward the side of the operating mechanism 30 (right side in the figure), while the opposing contact part 205 moves axially toward the opposite side from the side of the operating mechanism 30 (left side in the figure).

[0114] [B-2-1] Operation of coupling member 401 In the transmission mechanism 40, as the movable contact portion 105 moves, the coupling member 401 moves axially toward the operating mechanism 30, and the other end 42B of the connecting link 42 connected to the coupling member 401 also moves axially toward the operating mechanism 30.

[0115] [B-2-2] Operation of the reversal lever 41 In the transmission mechanism 40 of this embodiment, the reversing lever 41 is driven in conjunction with the connecting link 42, as well as the connecting link 45 and the conversion lever 46. Here, as the other end 42B of the connecting link moves, the reversing lever 41 rotates clockwise around the point where the other end 43B of the pivot lever and the pivot portion 41C of the reversing lever are rotatably connected. As a result, the other end 41B of the reversing lever moves toward the operating mechanism 30, and the one end 41A of the reversing lever moves toward the opposite side from the operating mechanism 30.

[0116] As one end 41A of the reversing lever moves, the support 202 moves axially away from the side of the operating mechanism 30. As a result, the opposing contact portion 205 supported by the support 202 also moves axially away from the side of the operating mechanism 30. In other words, axially, the opposing contact portion 205 moves away from the movable contact portion 105.

[0117] [B-2-3] Operation of the connecting link 42 In the transmission mechanism 40, the connecting link 42 rotates as the coupling member 401 moves, with the other end of the connecting link 42B rotatably connected to the support 202 as the axis of rotation.

[0118] Here, the connecting link 42 first rotates counterclockwise around the point where the other end 42B of the connecting link is rotatably connected to the support 202. As a result, one end 42A of the connecting link 42 moves axially toward the operating mechanism 30 and radially from the inside to the outside (see Figures 2A and 2B).

[0119] Subsequently, the connecting link 42 rotates clockwise around the point where the other end 42B of the connecting link is rotatably connected to the support 202. As a result, one end 42A of the connecting link 42 moves axially toward the operating mechanism 30 and radially from the outside to the inside (see Figures 2B and 2C).

[0120] [B-2-4] Operation of the pivot lever 43 In the transmission mechanism 40, the pivot lever 43 rotates around the pivot point axis as the coupling member 401 moves, with the part of the pivot lever 43A that is rotatably connected to the support cylinder 201 being the pivot point axis.

[0121] Here, the pivot lever 43 first rotates counterclockwise around the point where one end 43A of the pivot lever is rotatably connected to the support cylinder 201. As a result, the other end 43B of the pivot lever 43 moves radially from the inside to the outside (see Figures 2A and 2B).

[0122] Subsequently, the pivot lever 43 rotates clockwise around the point where one end 43A of the pivot lever is rotatably connected to the support cylinder 201, and moves in a clockwise direction. As a result, the other end 43B of the pivot lever 43 moves radially from the outside to the inside (see Figures 2B and 2C).

[0123] [B-2-5] Operation of linking link 45 (second linking link) In the transmission mechanism 40, the connecting link 45 (second connecting link) rotates as the coupling member 401 moves, with the portion of the connecting link end 45A that is rotatably connected to the reversing lever 41 as the axis of rotation.

[0124] Here, the connecting link 45 first rotates counterclockwise around the point where one end 45A of the connecting link is rotatably connected to the reversing lever 41. As a result, the other end 45B of the connecting link 45 moves axially toward the operating mechanism 30 and radially from the outside to the inside (see Figures 2A and 2B).

[0125] Subsequently, the connecting link 45 rotates clockwise around the point where one end 45A of the connecting link is rotatably connected to the reversing lever 41. As a result, the other end 45B of the connecting link 45 moves axially toward the operating mechanism 30 and radially from the inside to the outside (see Figures 2B and 2C).

[0126] [B-2-6] Operation of the conversion lever 46 In the transmission mechanism 40, the conversion lever 46 rotates as the coupling member 401 moves, with the part of the conversion lever 46A that is rotatably connected to the sealed container 1 as the axis of rotation.

[0127] Here, the conversion lever 46 rotates counterclockwise around the point where one end 46A of the conversion lever is rotatably connected to the sealed container 1. As a result, the other end 46B and the pivot point 46C of the conversion lever 46 move toward the operating mechanism 30 in the axial direction, as well as moving radially (see Figures 2A to 2C).

[0128] [C] Summary As described above, the opening and closing device of this embodiment is provided with a transmission mechanism 40 that transmits the driving force of the operating mechanism 30 to the opposing contact part 205 via the movable contact part 105, similar to the first embodiment. The transmission mechanism 40 transmits the driving force of the operating mechanism 30 to the opposing contact part 205 such that the direction of movement of the opposing contact part 205 is opposite to the direction of movement of the movable contact part 105. Therefore, in this embodiment, even when the driving force of the operating mechanism 30 is relatively low, the relative movement speed of the movable contact part 105 relative to the opposing contact part 205 can be increased.

[0129] In the opening and closing device of this embodiment, the transmission mechanism 40 includes, as described above, a reversing lever 41, a connecting link 42, a pivot lever 43, a connecting link 45, and a conversion lever 46. The reversing lever 41 includes one end 41A of the reversing lever, another end 41B of the reversing lever located on the opposite side of the one end 41A of the reversing lever, and a pivot portion 41C of the reversing lever located between the one end 41A and the other end 41B of the reversing lever. The connecting link 42 includes one end 42A of the connecting link and another end 42B of the connecting link located on the opposite side of the one end 42A of the connecting link. The pivot lever 43 includes one end 43A of the pivot lever and another end 43B of the pivot lever located on the opposite side of the one end 43A of the pivot lever. The connecting link 45 includes one end 45A of the connecting link and another end 45B of the connecting link located on the opposite side of the one end 45A of the connecting link. The conversion lever 46 includes one end 46A of the conversion lever, another end 46B of the conversion lever located on the opposite side of the one end 46A of the conversion lever, and a pivot point 46C of the conversion lever located between the one end 46A and the other end 46B of the conversion lever. One end 41A of the reversing lever is rotatably connected to the opposing contact part 205 via a support 202, and the other end 41B of the reversing lever is rotatably connected to one end 45A of the connecting link. The other end 45B of the connecting link is rotatably connected to the pivot point 46C of the conversion lever, and the other end 46B of the conversion lever is rotatably connected to the other end 42B of the connecting link. The other end 42B of the connecting link is rotatably connected to the movable contact part 105 via a coupling member 401. One end 46A of the conversion lever is rotatably connected to the sealed container 1. One end 43A of the pivot lever is rotatably connected to the sealed container 1 via a support cylinder 201. The other end 43B of the pivot lever is rotatably connected to the pivot portion 41C of the reversal lever.

[0130] The transmission mechanism 40 of this embodiment includes a pivot lever 43, similar to the first embodiment. One end 43A of the pivot lever is rotatably connected to the sealed container 1 via a support cylinder 201, and the other end 43B of the pivot lever is rotatably connected to the pivot portion 41C of the reversing lever 41. Therefore, in this embodiment as well, the component of the force acting on the sliding portion of the movable contact portion 105 and the opposing contact portion 205 is reduced by the component of the force acting on the sliding portion of the movable contact portion 105 and the opposing contact portion 205, which is perpendicular to the direction of movement of the opposing contact portion 205.

[0131] Therefore, in the opening and closing device of this embodiment, it is possible to prevent an increase in frictional force in the sliding part, making it easy to achieve high-speed operation.

[0132] In addition, in the opening and closing device of this embodiment, since each part of the transmission mechanism 40 is configured as described above, it is possible to shorten the length (diameter) of the sealed container 1 in the radial direction compared to the first embodiment. As a result, the opening and closing device of this embodiment can be made smaller than that of the first embodiment, and the volume of arc-extinguishing gas sealed in the sealed container 1 can be reduced.

[0133] <Other> While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents.

[0134] For example, the above embodiment illustrates the case where the switchgear is a puffer-type gas circuit breaker, but it is not limited to this. The above transmission mechanism may also be applied to switchgear other than a puffer-type gas circuit breaker. [Explanation of Symbols]

[0135] 1: Sealed container, 10: Movable side unit, 11: Movable side arc contact, 12: Movable side energized contact, 20: Opposing side unit, 21: Opposing side arc contact, 22: Opposing side energized contact, 30: Operating mechanism, 40: Transmission mechanism, 41: Reversing lever, 41A: One end of reversing lever, 41B: Other end of reversing lever, 41C: Reversing lever pivot point, 42: Connecting link, 42A: One end of connecting link, 42B: Other end of connecting link, 43: Pivot lever, 43A: One end of pivot lever, 43B: Other end of pivot lever, 45: Connecting link, 45 A: One end of connecting link, 45B: Other end of connecting link, 46: Conversion lever, 46A: One end of conversion lever, 46B: Other end of conversion lever, 46C: Pivot point of conversion lever, 101: Operating rod, 102: Cylinder, 103: Piston, 105: Movable side contact part, 107: Piston support, 109: Insulating nozzle, 121: Cylinder cylindrical part, 122: Cylinder bottom plate part, 201: Support cylinder, 202: Support, 205: Opposing side contact part, 211: Sliding smooth part, 221: Support plate part, 222: Support rod part, 301: Insulating rod, 401: Coupling member, H102: Discharge port, K201: Support cylinder opening, K201a: Support cylinder opening, PR: Mechanical puffer chamber, R109: Nozzle internal space, R109a: First nozzle internal space, R109b: Second nozzle internal space, R109c: Third nozzle internal space

Claims

1. A switching device that performs a closing operation to change an electrical circuit from an open state to a closed state, and an opening operation to change the electrical circuit from a closed state to an open state, A sealed container, The first contact element is housed inside the sealed container, A second contact portion is installed inside the sealed container so as to be opposite to the first contact portion, An operating mechanism drives the first contact portion such that when the closing operation is performed, the first contact portion approaches the second contact portion, and when the opening operation is performed, the first contact portion moves away from the second contact portion. A transmission mechanism transmits the driving force of the operating mechanism to the second contact portion via the first contact portion, such that when the closing operation is performed, the second contact portion approaches the first contact portion, and when the opening operation is performed, the second contact portion moves away from the first contact portion. Equipped with, The aforementioned transmission mechanism is A reversing lever including one end of the reversing lever, another end of the reversing lever located on the opposite side of the one end of the reversing lever, and a pivot point of the reversing lever located between the one end of the reversing lever and the other end of the reversing lever. A connecting link including one end of the connecting link and the other end of the connecting link located on the opposite side of the one end of the connecting link, and A pivot lever including one end of the pivot lever and the other end of the pivot lever located on the opposite side of the one end of the pivot lever. It has, One end of the reversal lever is rotatably connected to the second contact element, The other end of the reversing lever and the one end of the connecting link are rotatably connected. The other end of the connecting link is rotatably connected to the first contact element, One end of the pivot lever is rotatably connected to the sealed container. The other end of the pivot lever is rotatably connected to the pivot point of the reversing lever. Switching device.

2. A switching device that performs a closing operation to change an electrical circuit from an open state to a closed state, and an opening operation to change the electrical circuit from a closed state to an open state, A sealed container, The first contact element is housed inside the sealed container, A second contact portion is installed inside the sealed container so as to be opposite to the first contact portion, An operating mechanism drives the first contact portion such that when the closing operation is performed, the first contact portion approaches the second contact portion, and when the opening operation is performed, the first contact portion moves away from the second contact portion. A transmission mechanism transmits the driving force of the operating mechanism to the second contact portion via the first contact portion, such that when the closing operation is performed, the second contact portion approaches the first contact portion, and when the opening operation is performed, the second contact portion moves away from the first contact portion. Equipped with, The aforementioned transmission mechanism is A reversing lever including one end of the reversing lever, another end of the reversing lever located on the opposite side of the one end of the reversing lever, and a pivot point of the reversing lever located between the one end of the reversing lever and the other end of the reversing lever, A first connecting link comprising one end of a first connecting link and the other end of a first connecting link located on the opposite side of the first end of the first connecting link, A pivot lever including one end of the pivot lever and the other end of the pivot lever located on the opposite side of the one end of the pivot lever, A second connecting link comprising one end of the second connecting link and the other end of the second connecting link located opposite to the one end of the second connecting link, A conversion lever including one end of the conversion lever, the other end of the conversion lever located on the opposite side of the one end of the conversion lever, and the pivot point of the conversion lever located between the one end of the conversion lever and the other end of the conversion lever. It has, One end of the reversal lever is rotatably connected to the second contact element, The other end of the reversing lever and one end of the second connecting link are rotatably connected. The other end of the second connecting link and the pivot point of the conversion lever are rotatably connected. The other end of the conversion lever and the other end of the first connecting link are rotatably connected. The other end of the first connecting link is rotatably connected to the first contactor portion. One end of the conversion lever is rotatably connected to the sealed container. One end of the pivot lever is rotatably connected to the sealed container. The other end of the pivot lever is rotatably connected to the pivot point of the reversing lever. Switching device.

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