opening and closing device

Abstract

The present invention relates to an opening and closing device. The opening and closing device of the embodiment has first to third movable contacts, first to third transmission mechanisms, first to third containers, a crank shaft, an operating mechanism, and a buffer mechanism. The first to third movable contacts are housed in the first to third containers. The first to third transmission mechanisms are connected to the first to third movable contacts. The first to third containers house at least the first movable contact. The crank shaft operates the first to third transmission mechanisms to change the first to third movable contacts from a closed state to an open state. The operating mechanism is disposed on the first transmission mechanism side to rotate the crank shaft. The buffer mechanism is disposed on the third transmission mechanism side to buffer the rotation of the crank shaft.

Description

Technical Field

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

[0002] Conventional opening and closing devices are known in which movable contacts in each of the three phases are actuated via a drive mechanism and a shaft. For example, the shaft is composed of multiple parts and has joints. In particular, an insulator is used at the joints to prevent current flow. Furthermore, a structure has been disclosed in which the shafts are splined together to improve power transmission and reduce the number of parts, thus tightly transmitting torque accompanying rotational motion.

[0003] When the switching device performs an open-circuit operation, the shaft rotates to actuate the movable contacts of each phase. This shaft twisting causes different delays between the movable contacts of each phase, sometimes resulting in deviations in contact actuation. Furthermore, when the shaft is braked to stop the movement of the movable contacts of each phase, the movable contact of the first phase, which is closest to the operating mechanism, decelerates rapidly with the braking of the operating mechanism. However, the movable contacts of the second and third phases, which are farther from the operating mechanism, continue to move due to inertia, sometimes with delayed deceleration. As a result, the following problem exists: although the movable contact of the first phase reaches the open-circuit position and stops, the movable contacts of the second and third phases spring back beyond the open-circuit position.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 60-5462

[0007] Patent Document 2: Japanese Patent Application Publication No. 11-53998 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The problem to be solved by the present invention is to provide an opening and closing device that can stop multiple movable contacts at the open position with high precision during the opening operation.

[0010] Methods for solving problems

[0011] The opening and closing device of this embodiment includes a first movable contact, a first transmission mechanism, a first container, a second movable contact, a second transmission mechanism, a second container, a third movable contact, a third transmission mechanism, a third container, a crankshaft, an operating mechanism, and a buffer mechanism. The first movable contact is housed in the first container. The first transmission mechanism is connected to the first movable contact. The first container houses at least the first movable contact. The second movable contact is housed in the second container. The second transmission mechanism is connected to the second movable contact. The second container houses at least the second movable contact and is located side-by-side with the first container. The third movable contact is housed in the third container. The third transmission mechanism is connected to the third movable contact. The third container houses at least the third movable contact and is located side-by-side with the second container. The crankshaft actuates the first, second, and third transmission mechanisms, thereby changing the first, second, and third movable contacts from a closed-circuit state to an open-circuit state. An operating mechanism is located on the first transmission mechanism side to rotate the crankshaft. A buffer mechanism is located on the third transmission mechanism side to buffer the rotational motion of the crankshaft. Attached Figure Description

[0012] Figure 1 This is a diagram showing an outline of the opening and closing device 1 according to the first embodiment.

[0013] Figure 2 This is a diagram showing the outline of the auxiliary buffer mechanism 60.

[0014] Figure 3 It is a graph showing the travel curves of each movable contact as it moves from the closed position to the open position.

[0015] Figure 4 It is a graph showing the travel curves of each movable contact in the comparator as it moves from the closed position to the open position.

[0016] Figure 5 This is a diagram showing the outline of the opening and closing device 2 of the second embodiment.

[0017] Figure 6 This is a diagram showing the outline of the auxiliary buffer mechanism 60 of the opening and closing device in the third embodiment.

[0018] Figure 7 This is a diagram showing the outline of the auxiliary buffer mechanism 60 of the opening and closing device in the fourth embodiment. Detailed Implementation

[0019] The opening and closing device of the embodiment will be described below with reference to the accompanying drawings. In this application, the Z-direction, X-direction, and Y-direction of the orthogonal coordinate system are defined as follows: The Z-direction is the vertical direction, and the +Z-direction is upward. The X-direction is the horizontal direction, which is defined as the left-right direction of the opening and closing device. The +X-direction is the right side of the opening and closing device. The Y-direction is the horizontal direction and is orthogonal to the X-direction, which is the front-back direction of the opening and closing device. The +Y-direction is forward. In addition, for ease of explanation, the terms "forward" and other similar terms used in this specification are expressed from a viewpoint based on a direction observed from the opening and closing device.

[0020] (First Embodiment)

[0021] First, the opening and closing device of the first embodiment will be described. Figure 1 This is a diagram showing an outline of the opening and closing device 1 according to the first embodiment. Figure 2 This is a diagram showing the outline of the auxiliary buffer mechanism 60. Figure 1 The diagram shows the state of the opening and closing device 1 as viewed from above. The opening and closing device 1 includes, for example, a first phase 10, a second phase 20, a third phase 30, a crankshaft 40, an operating mechanism 50, and an auxiliary buffer mechanism 60.

[0022] The first phase 10, for example, includes a first container 11, a first opposing contact 12, a first movable contact 13, a first operating lever 14, a first insulating operating lever 15, a first crank 16, and a first sealing member 17. An insulating medium G is sealed inside the first container 11, isolating it from the external atmosphere and making it airtight. The first container 11 is a hollow container that is longer in the Y direction. The first opposing contact 12, the first movable contact 13, the first operating lever 14, the first insulating operating lever 15, and the first crank 16 are housed in the first container 11. A through hole is formed near one end of the first container 11 in the long side direction, and the first sealing member 17 is installed in this through hole. The first operating lever 14, the first insulating operating lever 15, and the first crank 16 constitute a first transmission mechanism 18.

[0023] The first opposing contact 12 is fixedly disposed inside the first container 11 and at the other end of the long side of the first container 11. The first opposing contact 12 protrudes toward one end of the long side of the first container 11 (-Y direction).

[0024] The first movable contact 13 has a concave shape that opens in the direction of the other end (+Y direction) of the first container 11, and its opening cross-section is O-shaped. The opening width (opening width in the X direction) of the concave portion of the first movable contact 13 is approximately the same as the width (width in the X direction) of the first opposing contact 12. For example, by moving the first movable contact 13 towards the other end of the first container 11, the first opposing contact 12 comes into contact with the first movable contact 13, and the first movable contact becomes closed. By moving the first movable contact 13 towards one end of the first container 11, the first opposing contact 12 separates from the first movable contact 13, and the first movable contact 13 becomes open.

[0025] The first movable contact 13 is integrally disposed at the other end of the first operating lever 14 and connected to the first operating lever 14. The first operating lever 14 is an elongated component along the long side of the first container 11. The first operating lever 14 is supported at both ends, for example by bearings (not shown), and moves linearly along the long side of the first container 11.

[0026] One end of the first operating lever 14 is connected to the other end of the first insulating operating lever 15 via a pin engagement. The first operating lever 14 is rotatable relative to the first insulating operating lever 15. One end of the first insulating operating lever 15 is connected to the first crank 16 via a pin engagement. The end of the first insulating operating lever 15 rotates about the pin connecting the first insulating operating lever 15 and the first crank 16 as the first crank 16 rotates. The first insulating operating lever 15 converts the rotational motion of the first crank 16 into the motion (linear motion) of the first operating lever 14.

[0027] The first crank 16 is fitted into the crankshaft 40 and rotates as the crankshaft 40 rotates. The crankshaft 40 is disposed through a through hole in the first container 11. A first sealing member 17 disposed in the through hole seals the through hole through which the crankshaft 40 passes, maintaining the airtightness of the first container 11. The crankshaft 40 is supported by bearings such as ball bearings (not shown) and rotates freely.

[0028] Phase 20 includes, for example, a second container 21, a second opposing contact 22, a second movable contact 23, a second operating lever 24, a second insulating operating lever 25, a second crank 26, and a second sealing member 27. Phase 30 includes, for example, a third container 31, a third opposing contact 32, a third movable contact 33, a third operating lever 34, a third insulating operating lever 35, a third crank 36, and a third sealing member 37. Both Phase 20 and Phase 30 have the same configuration as Phase 10. The second container 21 is arranged side by side with the first container 11, and the third container 31 is arranged side by side with the second container 21. The second transmission mechanism 28 is formed by the second operating lever 24, the second insulating operating lever 25, and the second crank 26, and the third transmission mechanism 38 is formed by the third operating lever 34, the third insulating operating lever 35, and the third crank 36.

[0029] The crankshaft 40 includes, for example, a first crankshaft 41, a second crankshaft 42, a third crankshaft 43, an operating mechanism side coupling 44, a first coupling 45, a second coupling 46, and a buffer mechanism side coupling 47. The crankshaft 40 actuates the first transmission mechanism 18, the second transmission mechanism 28, and the third transmission mechanism 38, causing the first movable contact 13, the second movable contact 23, and the third movable contact 33 to change between a closed-circuit state and an open-circuit state. The first crankshaft 41, the second crankshaft 42, and the third crankshaft 43 are correspondingly arranged with the first movable contact 13, the second movable contact 23, and the third movable contact 33. The first crankshaft 41, the second crankshaft 42, and the third crankshaft 43 are all elongated components with approximately the same diameter.

[0030] The first crank 41 passes through the first container 11, the second crank 42 passes through the second container 21, and the third crank 43 passes through the third container 31. A first crank 16 is fitted into the center of the long side of the first crank 41, a second crank 26 is fitted into the center of the long side of the second crank 42, and a third crank 36 is fitted into the center of the long side of the third crank 43.

[0031] An operating mechanism side coupling 44 is installed on one end of the first crankshaft 41 in the direction of its rotation axis. The second crankshaft 42 is located near the other end of the first crankshaft 41. The other end of the first crankshaft 41 and one end of the second crankshaft 42 are connected to each other via a first coupling 45. The third crankshaft 43 is located near the other end of the second crankshaft 42 in the direction of its rotation axis. The other end of the second crankshaft 42 and one end of the third crankshaft 43 are connected to each other via a second coupling 46. A buffer mechanism side coupling 47 is installed on the other end of the third crankshaft 43.

[0032] An operating mechanism 50 is disposed close to one end of the crankshaft 40. The operating mechanism 50 includes, for example, a rotating shaft 51, an operating mechanism crank 52, an intermediate rod 53, an intermediate handle 54, a connecting rod 55, a built-in spring 56, and a buffer 57. The operating mechanism 50 is disposed on the side of the first transmission mechanism 18 to cause the crankshaft 40 to rotate.

[0033] The rotating shaft 51 is coaxial with the crankshaft 40 and is connected to one end of the first crankshaft 41 via the operating mechanism side coupling 44. The rotating shaft 51 is mounted on the operating mechanism crank 52. The operating mechanism crank 52 rotates about the same axis as the rotating shaft 51. The operating mechanism crank 52 is pin-connected to the intermediate rod 53. The intermediate rod 53 is an elongated component with a range of motion capable of reciprocating along its long side. The reciprocating motion of the intermediate rod 53 relative to its long side causes the operating mechanism crank 52 and the rotating shaft 51 to rotate.

[0034] A central handle 54 is connected to the central rod 53. The central handle 54 corresponds to the movable range of the reciprocating motion of the central rod 53 and has a range of rotation about an axis parallel to the rotation axis 51.

[0035] The connecting rod 55 has two plate-shaped components. The connecting rod 55 is connected to the intermediate handle 54 by clamping the intermediate handle 54 through these plate-shaped components. The connecting rod 55 is connected to the intermediate handle 54 by having a range of motion for reciprocating motion in the vertical direction (Z direction) relative to the rotational movement of the intermediate handle 54.

[0036] An internal spring 56 applies a force to the connecting rod 55, supplying power to the crankshaft 40 via the connecting rod 55, intermediate lever 54, intermediate rod 53, operating mechanism crank 52, and rotating shaft 51. The force of the internal spring 56 is always suppressed. When an operation command for the opening / closing device 1 is output via a control device (not shown), the force of the internal spring 56 is released and applied to the connecting rod 55. The force applied to the connecting rod 55 is transmitted to the operating mechanism crank 52 via the intermediate lever 54 and intermediate rod 53, causing the operating mechanism crank 52 and rotating shaft 51 to rotate. As the rotating shaft 51 rotates, the crankshaft 40 rotates. The force applied by the internal spring 56 becomes the power to rotate the crankshaft 40 and is transmitted to the crankshaft 40. The internal spring 56 is an example of a power source.

[0037] The buffer 57 is configured to brake the rotational movement of the crankshaft 40 via the rotating shaft 51 when, for example, any one of the first movable contact 13, the second movable contact 23, or the third movable contact 33 reaches a position where braking begins via the buffer 57 (hereinafter referred to as the "brake start position"). The brake start position will be explained later.

[0038] An auxiliary damping mechanism 60 is disposed close to the other end of the crankshaft 40. The auxiliary damping mechanism 60 includes, for example, a damping mechanism crank 61, a damping roller 62, and a damper 63. The damper 63 includes a damping head 64, a damping cylinder 65, and a damping piston 66. The auxiliary damping mechanism 60 is positioned on the side of the third transmission mechanism 38 to dampen the rotational motion of the crankshaft. The auxiliary damping mechanism 60 is an example of a damping mechanism.

[0039] The buffer mechanism crank 61 is connected to the other end of the third crank rod 43 via the buffer mechanism side coupling 47. The rotation axis of the buffer mechanism crank 61 is coaxial with the crankshaft 40, and the rotation direction of the buffer mechanism crank 61 is the same as the rotation direction of the crankshaft 40.

[0040] A damping roller 62 is mounted on the front end of the other side of the damping mechanism crank 61. When the crankshaft 40 rotates, the damping mechanism crank 61 transmits the rotation of the crankshaft 40 to the damping roller 62. As the crankshaft 40 rotates, the damping roller 62 rotates and moves in the direction of rotation W around the crankshaft 40. The damping roller 62 is an example of a roller assembly.

[0041] A damper 63 is disposed to the side of the third phase 30. The damper 63 is a so-called oil damper, with oil sealed inside the damping cylinder 65 and equipped with a damping piston 66. A damping head 64 is disposed within the movable range of the crank 61 of the buffer mechanism. The damping head 64 is integrated with the damping piston 66, and the reciprocating motion of the damping head 64 is transmitted as the motion of the internal damping piston 66. The damping head 64 of the damper 63 engages (contacts) with the damping roller 62, and the energy of the rotational motion of the crankshaft 40 is absorbed by the damping cylinder 65. The damper 63 is an example of a buffer component.

[0042] Next, the opening operation of the opening and closing device 1 according to the first embodiment will be described. By performing the opening operation, the opening and closing device 1 ultimately separates the first movable contact 13 from the first opposing contact 12 inside the first container 11. Similarly, inside the second container 21 and the third container 31, the second movable contact 23 and the third movable contact 33 are separated from the second opposing contact 22 and the third opposing contact 32, respectively.

[0043] In the operating mechanism 50, the connecting rod 55 is actuated by the force of the built-in spring 56. The connecting rod 55 moves in the vertical direction (Z direction). The movement of the connecting rod 55 causes the intermediate handle 54 to rotate, which in turn moves the intermediate rod 53 connected to the intermediate handle 54 in the direction that pulls the operating mechanism crank 52. The movement of the intermediate rod 53 causes the operating mechanism crank 52 to rotate around the crankshaft 40. The rotational motion of the operating mechanism crank 52 is transmitted to the operating mechanism side coupling 44 via the rotating shaft 51, causing the first crank rod 41 to rotate in the same manner.

[0044] The rotation of the first crank 16, caused by the rotation of the first crank 41, causes the first insulating operating rod 15 to move. One end of the first insulating operating rod 15 rotates about a pin engaged with the first crank 16, and the other end rotates about a pin engaged with the first operating rod 14, so as to move the first operating rod 14 toward one end of the first container 11.

[0045] Movement of the first insulating operating lever 15 causes movement of the first operating lever 14, which moves linearly along the long side of the first container 11 from one end to the other. Movement of the first operating lever 14 causes the first movable contact 13 to move linearly toward one end of the first container 11. Movement of the first movable contact 13 causes it to separate from the first opposing contact 12.

[0046] The rotational motion of the first crank 41 is transmitted to the second crank 42 via the first coupling 45, causing the second crank 42 to rotate. The second crank 42 begins to rotate with a delay relative to the torsion of the first crank 41, the slight engagement of the fine teeth of the first crank 41 with the first coupling 45, the torsion of the first coupling 45, and the torsion of the second crank 42. Rotation of the second crank 42 moves the second crank 26, the second insulating operating lever 25, the second operating lever 24, and the second movable contact 23, causing the second movable contact 23 to disengage from the second opposing contact 22.

[0047] The rotational motion of the second crank 42 is transmitted to the third crank 43 via the second coupling 46, causing the third crank 43 to rotate. The third crank 43 begins to rotate with a delay relative to the torsion of the second crank 42, the slight engagement of the fine teeth of the second crank 42 with the second coupling 46, the torsion of the second coupling 46, and the torsion of the third crank 43. Rotation of the third crank 43 moves the third crank 36, the third insulating operating lever 35, the third operating lever 34, and the third movable contact 33, causing the third movable contact 33 to disengage from the third opposing contact 32.

[0048] The rotational motion of the third crankshaft 43 is transmitted to the buffer mechanism crank 61 of the auxiliary buffer mechanism 60 via the buffer mechanism side coupling 47 coupled to the third crankshaft 43. Corresponding to the transmitted rotational motion, such as... Figure 2 As shown, the crank 61 of the buffer mechanism rotates in the counterclockwise direction W about the crankshaft 40. When the crank 61 of the buffer mechanism rotates in the direction W, the damping roller 62 moves toward the damping head 64 and approaches the damping head 64. In the final stage of the operation, the damping roller 62 engages (contacts) with the damping head 64, causing the damping head 64 to move toward the damping cylinder 65 and be pressed into the damping cylinder 65.

[0049] The damping head 64 is integrated with the damping piston 66 disposed in the damping cylinder 65. Therefore, when the damping roller 62 presses the damping head 64 into the damping cylinder 65, the damping piston 66 moves in the oil in the damping cylinder 65, thereby generating braking force in the damper 63.

[0050] The damper 63 generates braking force, thereby decelerating the rotating third crank 43. Next, the second crank 42 decelerates later than the third crank 43, and then the first crank 41 decelerates later than the second crank 42. Finally, the braking force of the buffer 57 provided in the operating mechanism 50 is applied via the connecting rod 55 to brake the crankshaft 40, causing the first movable contact 13, the second movable contact 23, and the third movable contact 33 to reach the open-circuit position and become open-circuit.

[0051] Next, the results of the stroke curves of the first movable contact 13, the second movable contact 23, and the third movable contact 33 as they move from the closed position to the open position, obtained through mechanism analysis, will be explained. In this mechanism analysis, the positions of the first movable contact 13, the second movable contact 23, and the third movable contact 33 (hereinafter referred to as "movable contact positions") are defined as positions expressed as percentages, with the open position set to 0% and the closed position set to 100%.

[0052] Figure 3 This is a graph showing the travel curves of each movable contact as it moves from the closed position to the open position. The first travel curve S1 represents the travel curve of the first movable contact 13, the second travel curve S2 represents the travel curve of the second movable contact 23, and the third travel curve S3 represents the travel curve of the third movable contact 33. The command reception time t0 is the time it takes to receive the action command output by the control device.

[0053] Furthermore, a braking start position is set for the movable contact position. The braking start position is set, for example, to any movable contact position between 15% and 25%, and in this mechanism analysis, it is set to the 20% position. For example, the braking start position is determined based on the stroke length of the damping piston 66 in the auxiliary buffer mechanism 60, the buffer 57, and the braking force of the auxiliary buffer mechanism 60.

[0054] In this analysis, it is assumed that the crankshaft 40 is braked via the buffer 57 and the auxiliary buffer mechanism 60. Figure 3 The diagram also shows the time variation of the braking force applied to the crankshaft 40 by the buffer 57 and the auxiliary buffer mechanism 60, respectively. The first braking force curve B1 represents the time variation of the braking force applied to the crankshaft 40 by the buffer 57, and the second braking force curve B2 represents the time variation of the braking force applied to the crankshaft 40 by the auxiliary buffer mechanism 60.

[0055] Based on the results of the mechanism analysis, between the first movable contact 13 and the third movable contact 33, the first movable contact 13 reaches the braking start position first. Therefore, the buffer 57, which is positioned close to the first movable contact 13, begins to dampen the rotational motion of the crankshaft 40 before the auxiliary buffer 60, which is positioned further away from the first movable contact 13. Therefore, the braking start timing (hereinafter referred to as "first braking start timing") t1, where the buffer 57 begins to brake the crankshaft 40, is set earlier than the braking start timing (hereinafter referred to as "second braking start timing") t2, where the auxiliary buffer 60 begins to brake the crankshaft 40.

[0056] The first braking start timing t1 can be set to a timing later than the second braking start timing t2, or it can be set to the same timing as the second braking start timing t2. In particular, if the third movable contact 33 reaches the braking start position first between the first movable contact 13 and the third movable contact 33, it is preferable to set the first braking start timing t1 to a timing later than the second braking start timing t2.

[0057] In the analysis of this mechanism, the braking force of the buffer 57 and the auxiliary buffer mechanism 60 is as follows: Figure 3 The first braking force curve B1 and the second braking force curve B2 shown in the figure change as indicated. The braking end time (hereinafter referred to as "first braking end time") t3 when the buffer 57 ends braking the crankshaft 40 is set to a time later than the braking end time (hereinafter referred to as "second braking end time") t4 when the auxiliary buffer mechanism 60 ends braking the crankshaft 40.

[0058] The braking force applied by the buffer 57 is greater than the braking force applied by the auxiliary buffer mechanism 60, and the braking force applied by the buffer 57 is the main force for braking the crankshaft 40. The first braking end time t3 can be set to a time earlier than the second braking end time t4, or the first braking end time t3 and the second braking end time t4 can be set to the same time.

[0059] According to the analysis of this mechanism, by setting the proportion of the braking force applied by the buffer 57 to the crankshaft 40 by the buffer 57 and the auxiliary buffer mechanism 60 to about 67% of the maximum value of 100%, rebound can be effectively suppressed. Taking into account the assembly deviations and elastic deformation of the crankshaft 40, buffer 57, and auxiliary buffer mechanism 60 in the opening and closing device 1, it is preferable to set the proportion of the braking force applied by the buffer 57 in the range of 50% to 70%.

[0060] Next, in the opening and closing device 1 of the first embodiment, the effect of providing the auxiliary buffer mechanism 60 will be explained while considering the differences from the opening and closing device (hereinafter referred to as the "comparison device") that is being compared. The comparison device is an opening and closing mechanism of the opening and closing device 1 in which the auxiliary buffer mechanism 60 has been removed.

[0061] Figure 4 It is a graph showing the travel curves of each movable contact as the comparator moves from the closed position to the open position. Figure 4 The travel curves of each movable contact of the comparator are shown. Figure 4 The diagram also shows the time variation of the braking force applied to the crankshaft 40 by the buffer 57.

[0062] The first stroke curve S11 represents the stroke curve of the first movable contact 13, the second stroke curve S12 represents the stroke curve of the second movable contact 23, and the third stroke curve S13 represents the stroke curve of the third movable contact 33. The braking force curve B11 represents the time variation of the braking force applied to the crankshaft 40 by the buffer 57.

[0063] In the comparison device, when the crankshaft 40 is rotated by the operating mechanism 50, a deviation occurs in the stroke between the first movable contact 13, the second movable contact 23, and the third movable contact 33 of the crankshaft 40 due to the torsional rigidity generated by the crankshaft 40. In contrast, in the opening and closing device 1, since an auxiliary buffer mechanism 60 is provided, a deviation reduction effect can be obtained, especially in the time after the first braking start timing t1, where it is desired to suppress the deviation.

[0064] In the comparison device, because the auxiliary buffer mechanism 60 is not provided, the braking force applied to the crankshaft 40, especially to the second crankshaft 42 and the third crankshaft 43 which are located away from the buffer 57, is reduced. In this case, as according to Figure 4 As can be seen from the second stroke curve S12 and the third stroke curve S13 shown, an overtravel occurs when the second movable contact 23 and the third movable contact 33, which are respectively connected to the second crank 42 and the third crank 43, move beyond the open circuit position.

[0065] like Figure 4As shown, a large deviation between the first stroke curve S11, the second stroke curve S12, and the third stroke curve S13 indicates a large deviation between the first movable contact 13, the second movable contact 23, and the third movable contact 33 during open-circuit operation. When the deviation between the first movable contact 13, the second movable contact 23, and the third movable contact 33 increases, a pressure difference is generated in the compression chambers (not shown), which are respectively located in the first container 11, the second container 21, and the third container 31 and whose volumes are compressed in conjunction with the actions of the first movable contact 13, the second movable contact 23, and the third movable contact 33. This creates a pressure difference in the compression chambers. When a pressure difference occurs in the compression chambers, the gas flow rate to the electrodes (contacts) becomes unstable, and the cut-off performance during open-circuit operation sometimes decreases.

[0066] In contrast, in the opening and closing device 1, such as Figure 3 As shown, the first stroke curve S11, the second stroke curve S12, and the third stroke curve S13 will not exceed the open circuit position. Therefore, by setting the auxiliary buffer mechanism 60, overtravel can be suppressed in any of the first movable contact 13, the second movable contact 23, and the third movable contact 33.

[0067] The insulating medium G sealed in the first container 11, the second container 21, and the third container 31 is, for example, sulfur hexafluoride gas (SF6 gas). In contrast, in recent years, alternative gases such as air and carbon dioxide have been considered as replacements for SF6. In the opening and closing device 1, when air or carbon dioxide gas is used as the insulating medium G, the pressure difference in the compression chamber is relatively large. This situation can be explained using the general formula for adiabatic compression.

[0068] In equation (1) below, with the initial pressure P0 and initial volume V0 set as the initial pressure, the current pressure is set as P and the current volume is set as V. When the internal volume is changed from the initial pressure P0 to the current pressure P using a piston, the specific heat ratio γ, which takes different values ​​depending on the gas, can be expressed by equation (1).

[0069] P=P0×(V / V0)^γ……(1)

[0070] As representative physical parameters for insulating medium G, the specific heat ratio γ of SF6 is taken as 1.1, that of carbon dioxide is taken as 1.3, and that of air is taken as 1.4. Therefore, in gases such as carbon dioxide and air, the volume difference is greatly amplified by the multiplier of the specific heat ratio γ, and the volume difference of the compression chamber is largely manifested as a pressure difference.

[0071] Regarding this, in the opening and closing device 1 of the first embodiment, the stroke curves of the first movable contact 13, the second movable contact 23, and the third movable contact 33 can be made consistent. Therefore, during the opening operation, the first movable contact 13, the second movable contact 23, and the third movable contact 33 can be stopped with high precision at the open position. Furthermore, the pressure difference (gas blowing pressure) between the compression chambers of the first phase 10, the second phase 20, and the third phase 30 can be reduced, thus making the gas blowing flow to the electrodes (contacts) consistent and stabilizing the circuit breaking performance.

[0072] Furthermore, in the opening and closing device 1 of the first embodiment, it is possible to suppress [the following]. Figure 4 The overtravel and bounce of the first movable contact 13, the second movable contact 23, and the third movable contact can be observed in the comparison device shown in the stroke curve. Therefore, it is possible to maintain the withstand voltage against transient recovery voltage and suppress re-arc ignition.

[0073] Furthermore, in the opening and closing device 1 of the first embodiment, a buffer 57 is provided on the side of the first transmission mechanism 18, and an auxiliary buffer mechanism 60 is provided on the side of the third transmission mechanism 38, thereby suppressing the torsion when braking the crankshaft 40. As a result, the mechanical endurance of the crankshaft 40 can be increased.

[0074] Furthermore, in the opening and closing device 1 of the first embodiment, the energy buffered in the crankshaft 40 is dispersed by both the buffer 57 included in the operating mechanism 50 and the auxiliary buffer mechanism 60. Therefore, the mechanical endurance of the first crankshaft 41, the second crankshaft, and the third crankshaft 43 in the crankshaft 40 can be improved.

[0075] (Second Implementation)

[0076] Next, the opening and closing device of the second embodiment will be described. In the embodiments after the second embodiment, the same symbols are used for parts that are common to the first embodiment, and the description is sometimes omitted. The main difference between the opening and closing device 2 of the second embodiment and the opening and closing device 1 of the first embodiment is the configuration of the crankshaft 70, so the description will focus on this difference.

[0077] Figure 5 This is a diagram showing the outline of the opening and closing device 2 of the second embodiment. Figure 5 The diagram shows a top view of the opening and closing device 2. In the opening and closing device 2 of the second embodiment, the crankshaft 70 includes, for example, a first crank 71, a second crank 72, a third crank 73, an operating mechanism side coupling 74, a first coupling 75, a second coupling 76, and a buffer mechanism side coupling 77.

[0078] The crankshaft 70 actuates the first transmission mechanism 18, the second transmission mechanism 28, and the third transmission mechanism 38, causing the first movable contact 13, the second movable contact 23, and the third movable contact 33 to change from a closed-circuit state to an open-circuit state. The first crank lever 71, the second crank lever 72, and the third crank lever 73 are correspondingly arranged with the first movable contact 13, the second movable contact 23, and the third movable contact 33. The first crank lever 71, the second crank lever 72, and the third crank lever 73 are all long strip components with a certain thickness and approximately the same length.

[0079] The first crank 71 passes through the first container 11, the second crank 72 passes through the second container 21, and the third crank 73 passes through the third container 31. A first crank 16 is fitted into the center of the long side of the first crank 71, a second crank 26 is fitted into the center of the long side of the second crank 72, and a third crank 36 is fitted into the center of the long side of the third crank 73.

[0080] An operating mechanism side coupling 74 is installed on one end of the first crankshaft 71. The other end of the first crankshaft 71 is connected to one end of the second crankshaft 72 via a first coupling 75, and the other end of the second crankshaft 72 is connected to one end of the third crankshaft 73 via a second coupling 76. A buffer mechanism side coupling 77 is installed on the other end of the third crankshaft 73.

[0081] The second moment of the section of the third crank 73 about the axis of rotation is less than the second moment of the section of the second crank 72 about the axis of rotation. The second moment of the section of the second crank 72 about the axis of rotation is less than the second moment of the section of the first crank 71 about the axis of rotation.

[0082] A more specific description of the crankshaft 70 is provided. When calculating the section modulus of the first crankshaft 71 along the rotation axis in the X direction, its minimum value is set as the minimum section modulus of the first crankshaft 71 (hereinafter referred to as the "first minimum section modulus") Ia. Similarly, the minimum value when calculating the section modulus of the second crankshaft 72 along the rotation axis in the X direction is set as the minimum section modulus of the second crankshaft 72 (hereinafter referred to as the "second minimum section modulus") Ib, and the minimum value when calculating the section modulus of the third crankshaft 73 along the rotation axis in the X direction is set as the minimum section modulus of the third crankshaft 73 (hereinafter referred to as the "third minimum section modulus") Ic.

[0083] In the opening and closing device 2, the first minimum section coefficient Ia, the second minimum section coefficient Ib, and the third minimum section coefficient Ic are in the relationship shown in equation (2) below. The first minimum section coefficient Ia, the second minimum section coefficient Ib, and the third minimum section coefficient Ic may also be in the relationship shown in equation (3) below or equation (4) below.

[0084] Ia>Ib>Ic……(2)

[0085] Ia≥Ib>Ic……(3)

[0086] Ia>Ib≥Ic……(4)

[0087] The outer diameters of the operating mechanism side couplings 74, 75, and 76 are all one size larger than the thicker of the two connected rods, and they have different outer diameters relative to each other. In this case, the outer diameters of the operating mechanism side couplings 74, 75, and 76 decrease sequentially. Alternatively, the outer diameters of the operating mechanism side couplings 74, 75, and 76 can also be the same.

[0088] In the opening and closing device 2 of the second embodiment, as the first crank 71 rotates, the first crank 16 rotates with a moment of inertia based on the section coefficient of the first crank 71. Similarly, as the second crank 72 rotates, the second crank 26 rotates with a moment of inertia based on the section coefficient of the second crank 72, and as the third crank 73 rotates, the third crank 36 rotates with a moment of inertia based on the section coefficient of the third crank 73.

[0089] Here, the following relationship exists: the second moment of section about the axis of rotation of the third crank 73 is less than the second moment of section about the axis of rotation of the second crank 72, and the second moment of section about the axis of rotation of the second crank 72 is less than the second moment of section about the axis of rotation of the first crank 71. Therefore, the moment of inertia applied to the third crank 36 is less than the moment of inertia applied to the second crank 26, and the moment of inertia applied to the second crank 26 is less than the moment of inertia applied to the first crank 16. Consequently, the delay relative to the first crank 41 and the second crank 42 when the second crank 42 and the third crank 43 begin to rotate can be reduced. Furthermore, a three-phase rotational torque is applied to the first crank 41 on the side close to the operating mechanism 50, but the moment of inertia applied to the third crank 36 connected to the third crank 43 on the side close to the auxiliary buffer mechanism 60 is smaller, thus reducing the rotational torque applied to the third crank 43.

[0090] (Third Implementation)

[0091] Next, the opening and closing device of the third embodiment will be described. The main difference between the opening and closing device 1 of the first embodiment and the third embodiment is the configuration of the auxiliary buffer mechanism 60, so the description will focus on this difference.

[0092] Figure 6This is a schematic diagram showing the auxiliary buffer mechanism 60 of the opening and closing device according to the third embodiment. The auxiliary buffer mechanism 60 of the opening and closing device in the third embodiment, like that in the first embodiment, includes a buffer mechanism crank 61, a damping roller 62, and a damper 63. The damper 63 includes a damping head 64, a damping cylinder 65, and a damping piston 66. These features are the same as in the first embodiment.

[0093] The auxiliary damping mechanism 60 also includes a frame 81, an auxiliary damping mechanism support 82, a gasket 83, a fixing bolt 84, a first nut 85, and a second nut 86. The frame 81 is fixedly mounted above the damping cylinder 65. The frame 81 is maintained in a relative position to the crankshaft 40.

[0094] An auxiliary buffer mechanism support 82 is suspended on a platform 81. A shim 83 is sandwiched between the platform 81 and the auxiliary buffer mechanism support 82. The auxiliary buffer mechanism support 82, holding the shim 83, is fixed to the platform 81 using fixing bolts 84. The width between the auxiliary buffer mechanism support 82 and the platform 81 can be adjusted by the thickness and number of the shims 83. The shims 83 are provided, for example, to adjust the relative height position of the damper 63 relative to the damping roller 62. The shim 83 is an example of a position adjustment mechanism.

[0095] A through hole for the damping cylinder 65 is formed in the lower part of the auxiliary buffer mechanism support member 82. A first nut 85 and a second nut 86 are fixed at the front and rear positions of the through hole, respectively. The openings of the first nut 85 and the second nut 86 are arranged concentrically with the through hole of the auxiliary buffer mechanism support member 82.

[0096] A threaded portion 67 is provided on the side of the damping cylinder 65, which engages with the first nut 85 and the second nut 86. The damping cylinder 65 passes through a through hole formed in the auxiliary buffer mechanism support member 82 and is screwed into the first nut 85 and the second nut 86, thereby the damper 63 is supported and fixed by the auxiliary buffer mechanism support member 82. The auxiliary buffer mechanism support member 82, the first nut 85, and the second nut 86 are examples of support components that support the damper 63.

[0097] When the damping cylinder 65, which is screwed into the first nut 85 and the second nut 86, is rotated, the threaded portion 67 moves along the first nut 85 and the second nut 86, causing the damping cylinder 65 to move forward or backward. The threaded portion 67 is provided to engage with the teeth provided in the first nut 85 and the second nut 86 to adjust the relative position of the damper 63 with respect to the damping roller 62. The teeth engaged by the threaded portion 67 may also be provided in the first nut 85 and the second nut 86. For example, the teeth engaged by the threaded portion 67 may also be provided in the through hole of the auxiliary buffer mechanism support member 82. The threaded portion 67 is an example of a position adjustment mechanism.

[0098] In the opening and closing device of the third embodiment, during the opening operation, the damping roller 62 approaches the damping head 64 of the damper 63 as the crank 61 of the buffer mechanism rotates, eventually contacting the damping roller 62 with the damping head 64. When the damping roller 62 contacts the damping head 64, the damping piston 66, which is located in the damping cylinder 65 and connected to the damping head 64, moves in the oil, thereby dissipating energy. The damping cylinder 65 is securely fastened by the threaded portion 67, the first nut 85, and the second nut 86, thereby receiving the reaction force of the braking force via the auxiliary buffer mechanism support member 82 supported by the frame 81.

[0099] In the opening and closing device of the third embodiment, the auxiliary buffer mechanism 60 includes a first nut 85 and a second nut 86, and a threaded portion 67 is provided on the side of the damping cylinder 65. Therefore, by rotating the damping cylinder 65 relative to the first nut 85 and the second nut 86, the position of the damper 63 relative to the damping roller 62 can be easily adjusted. In this case, the first nut 85 and the second nut 86 may also be omitted.

[0100] Furthermore, in the opening and closing device of the third embodiment, the auxiliary buffer mechanism 60 includes shims 83 sandwiched between the frame 81 and the auxiliary buffer mechanism support 82. By changing the thickness and number of shims 83, the width between the frame 81 and the auxiliary buffer mechanism support 82 can be adjusted, thereby changing the height position of the damper 63 supported by the auxiliary buffer mechanism support 82. Therefore, by adjusting the thickness of the shims 83, the position of the damping cylinder 65 (damper 63) relative to the damping roller 62 can be adjusted. By adjusting the position of the damper 63 relative to the damping roller 62, the timing of the contact between the damping roller 62 and the damping head 64 can be adjusted.

[0101] Furthermore, the position adjustment of the damper 63 relative to the damping roller 62 can be performed simply by setting shims 83 of different thicknesses or adjusting the number of shims 83. Therefore, errors caused by manufacturing and assembly can be easily adjusted, and appropriate braking position and braking force can be generated.

[0102] Furthermore, the auxiliary buffer mechanism support 82, which is inserted into the damping cylinder 65 in the damper 63 from the front and rear, is connected by the first nut 85 and the second nut 86. Therefore, the entire damping cylinder 65 can be securely fixed. Thus, the position of the damper 63 supported by the auxiliary buffer mechanism support 82 can be stabilized, and the energy transmitted to the damper 63 via the damping roller 62 during braking of the crankshaft 40 can be reliably absorbed.

[0103] (Fourth implementation)

[0104] Next, the opening and closing device of the third embodiment will be described. The main difference between the opening and closing device 1 of the first embodiment and the opening and closing device of the fourth embodiment is the configuration of the auxiliary buffer mechanism 60, so the description will focus on this difference.

[0105] Figure 7 This is a schematic diagram showing the auxiliary buffer mechanism 60 of the opening and closing device according to the fourth embodiment. The auxiliary buffer mechanism 60 of the opening and closing device in the fourth embodiment, like that in the first embodiment, includes a buffer mechanism crank 61, a damping roller 62, and a damper 63. The damper 63 includes a damping head 64, a damping cylinder 65, a damping piston 66, a frame 81, an auxiliary buffer mechanism support 82, a washer 83, and a fixing bolt 84. These features are the same as in the third embodiment.

[0106] The auxiliary buffer mechanism 60 also includes a lower stud 90a, an upper stud 90b, a first lower nut 91a, a second lower nut 91b, a third lower nut 91c, a first upper nut 91d, a second upper nut 91e, a third upper nut 91f, a fixing plate 92, a lower washer 93, a lower fixing bolt 94a, and an upper fixing bolt 94b.

[0107] A fixing plate 92 is disposed below the auxiliary buffer mechanism support 82 and in front of the damping cylinder 65. The fixing plate 92 is connected to the auxiliary buffer mechanism support 82 below the damping cylinder 65 via a lower stud 90a and above the damping cylinder 65 via an upper stud 90b.

[0108] The lower stud 90a is fixed by being clamped between the first lower nut 91a and the second lower nut 91b. The lower stud 90a is further inserted into the fixing plate 92 and fixed by the third lower nut 91c. The upper stud 90b is fixed by being clamped between the first upper nut 91d and the second upper nut 91e. The upper stud 90b is further inserted into the fixing plate 92 and fixed by the third upper nut 91f. The lower stud 90a and the upper stud 90b are fixed by nuts 91a to 91f, thereby allowing adjustment of the position of the fixing plate 92 in the Y direction relative to the auxiliary buffer mechanism support 82, and further allowing adjustment of the position of the fixing plate 92 in the Y direction relative to the damping cylinder 65.

[0109] A lower shim 93 is sandwiched between the damping cylinder 65 and the fixing plate 92. The width between the damping cylinder 65 and the fixing plate 92 can be adjusted by the thickness and number of the lower shims 93. The lower shims 93 are provided, for example, to adjust the relative front-to-back position of the damper 63 with respect to the damping roller 62. The lower shim 93 is an example of a position adjustment mechanism.

[0110] In the opening and closing device of the fourth embodiment, the auxiliary buffer mechanism 60 includes a fixing plate 92 disposed in front of the damping cylinder 65. When braking force is applied to the crankshaft 40, a reaction force of the braking force is generated in the damping cylinder 65. The generated reaction force acts on the fixing plate 92 disposed in front of the damping cylinder 65. The fixing plate 92 is connected to the auxiliary buffer mechanism support member 82 via a lower stud 90a and an upper stud 90b. Therefore, the reaction force generated in the damping cylinder 65 is transmitted to the auxiliary buffer mechanism support member 82 via the fixing plate 92. Thus, the reaction force generated in the damping cylinder 65 can be reliably absorbed.

[0111] In the opening and closing device of the fourth embodiment, the auxiliary buffer mechanism 60 includes a lower shim 93 sandwiched between the damping cylinder 65 and the fixing plate 92. By changing the thickness or number of the lower shims 93, the width between the damping cylinder 65 and the fixing plate 92 can be adjusted, thereby changing the front-rear position of the damper 63 supported by the auxiliary buffer mechanism support member 82. Therefore, by adjusting the thickness of the lower shims 93, the position of the damper 63 relative to the damping roller 62 can be adjusted. By adjusting the position of the damper 63 relative to the damping roller 62, the timing of the contact between the damping roller 62 and the damping head 64 can be adjusted.

[0112] Furthermore, the position adjustment of the damper 63 relative to the damping roller 62 can be performed simply by setting lower shims 93 of different thicknesses or adjusting the number of lower shims 93. Therefore, errors caused by manufacturing and assembly can be easily adjusted, and appropriate braking position and braking force can be generated.

[0113] In the opening and closing device of the fourth embodiment, a lower washer 93 is used instead of the threaded portion 67 provided on the side of the first nut 85, the second nut 86, and the damping cylinder 65 shown in the third embodiment to adjust the position of the damper 63 relative to the damping roller 62. Therefore, the assemblability when assembling the auxiliary buffer mechanism 60 can be improved.

[0114] In the above embodiments, a return spring that applies force to the crankshaft 40 when the crankshaft 40 performs a closed-loop operation may also be provided in the auxiliary buffer mechanism 60. By providing a return spring in the auxiliary buffer mechanism 60 and, for example, making the force of the return spring sufficiently strong, it can assist in the start of the closed-loop operation and reduce the deviation of the first movable contact 13, the second movable contact 23, and the third movable contact 33 during the closed-loop stroke.

[0115] Furthermore, in the above embodiments, the built-in spring 56 in the operating mechanism 50 serves as a power source to apply power to the crankshaft 40, but other drive sources besides the built-in spring 56 may also serve as power sources to apply power to the crankshaft 40. For example, the drive source of the operating mechanism 50 may also utilize hydraulic force, including linear drive and electromagnetic force driven by a motor.

[0116] Furthermore, in the above embodiments, an oil damper is used as the damper 63, which serves as a buffer component. However, the buffer component may not be an oil damper; for example, it may be a gas damper, an electromagnetic mechanism, or a rotary damper. Moreover, the operating levers, insulating operating levers, and other components in the transmission mechanism are not limited to being composed of a single component; they may be composed of multiple components through appropriate integration. For example, the transmission mechanism may have four sections instead of three.

[0117] Furthermore, in the above embodiments, the first movable contact 13, the second movable contact 23, and the third movable contact 33 are concave in shape, and the first opposing contact 12, the second opposing contact 22, and the third opposing contact 33 are convex in shape. Besides the shapes described above, the shapes of the movable contacts and opposing contacts can also be shapes that allow each contact to make contact when the circuit is closed. For example, the movable contact can be convex in shape and the opposing contact can be concave in shape, or both the movable contact and the opposing contact can be planar in shape.

[0118] Furthermore, in the above embodiments, the crankshaft 40 connects the first crankshaft 41, the second crankshaft 42, and the third crankshaft 43 via the first coupling 45 and the second coupling 46. However, the crankshaft may also consist of one, two, or four or more cranks. When the crankshaft is a single crank, for example, by changing the magnitude of the second moment of the cross-section of the cranks corresponding to the first phase 10, the second phase 20, and the third phase 30, as in the second embodiment, a stepped crank connected to a column with a different diameter may be used. Alternatively, the crankshaft may use a crank whose second moment of the cross-section about the axis of rotation tends to be smaller the further away from the operating mechanism 50 it is, for example, a tapered crank with a smaller diameter the further away from the operating mechanism 50 it is.

[0119] "Tendent to be smaller" includes, for example, a tendency to decrease uniformly, as well as a tendency to decrease, but with a portion increasing in the middle, resulting in an overall decrease. "Tendent to be smaller" includes, for example, a crankshaft whose moment of second cross-section about the axis of rotation gradually decreases the further away from the operating mechanism 50 it is located. In a part of the crankshaft, especially in a position far from where the crank is mounted, there are points where the moment of second cross-section increases locally, but overall the crankshaft decreases the further away from the operating mechanism 50 it is.

[0120] Furthermore, in the above embodiments, an operating mechanism-side coupling 44 is used to connect the operating mechanism 50 to the crankshaft 40. However, it is also possible to directly connect the crankshaft 40 to the operating mechanism 50, for example, the rotating shaft 51, without using the operating mechanism-side coupling 44. Similarly, although a buffer mechanism-side coupling 47 is used to connect the auxiliary buffer mechanism 60 to the crankshaft 40, it is also possible to directly connect the crankshaft 40 to the auxiliary buffer mechanism 60, for example, the buffer mechanism crank 61, without using the buffer mechanism-side coupling 47.

[0121] Furthermore, in the above embodiments, the auxiliary buffer mechanism 60 is disposed outside the third transmission mechanism 38 (to the right in the X direction), but it can be disposed at any position as long as it is disposed on the side of the third transmission mechanism 38 closer to the operating mechanism 50. For example, the auxiliary buffer mechanism 60 can also be disposed between the second transmission mechanism 28 and the third transmission mechanism 38. In addition, the elements in each embodiment can also be appropriately combined.

[0122] According to at least one embodiment described above, a first movable contact housed in a first container, a first transfer mechanism connected to the first movable contact, a first container housing at least the first movable contact, a second movable contact housed in a second container, a second transfer mechanism connected to the second movable contact, a second container housing at least the second movable contact and arranged side-by-side with the first container, a third movable contact housed in a third container, a third transfer mechanism connected to the third movable contact, and a second container housing at least the third movable contact and arranged side-by-side with the first container, are used in this configuration. The third container, which is arranged side by side with the second container, the crankshaft that causes the first, second, and third movable contacts to change from a closed state to an open state by operating the first, second, and third transmission mechanisms, the operating mechanism that rotates the crankshaft, and the buffer mechanism that buffers the rotation of the crankshaft are arranged on the third transmission mechanism side, are capable of stopping the multiple movable contacts at the open position with high precision during the open-circuit operation.

[0123] Several embodiments of the present invention have been described, but these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other ways, 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, and are included in the scope of the invention as described in the claims and its equivalents.

[0124] Explanation of symbols

[0125] 2: Opening and closing device; 10: Phase 1; 11: Container 1; 12: Opposite contact 1; 13: Movable contact 1; 14: Operating lever 1; 15: Insulated operating lever 16: Crank 1; 17: Sealing component 1; 18: Transmission mechanism 1; 20: Phase 2; 21: Container 2; 22: Opposite contact 2; 23: Movable contact 2; 24: Operating lever 2; 25: Insulated operating lever 2; 26: Crank 2; 27: Sealing component 2; 28: Transmission mechanism 2; 30: Phase 3; 31: Container 3; 32: Opposite contact 3; 33: Movable contact 3; 34: Operating lever 3; 35: Insulated operating lever 3; 36: Crank 3; 37: Sealing component 3; 38: Transmission mechanism 3; 40, 7 0: Crankshaft; 41, 71: First crankshaft; 42, 72: Second crankshaft; 43, 73: Third crankshaft; 44, 74: Operating mechanism side coupling; 45, 75: First coupling; 46, 76: Second coupling; 47, 77: Buffer mechanism side coupling; 50: Operating mechanism; 56: Built-in spring; 57: Buffer; 60: Auxiliary buffer mechanism; 61: Buffer mechanism crank; 62: Damping roller; 63: Damper; 64: Damping head; 65: Damping cylinder; 66: Damping piston; 67: Threaded part; 81: Stand; 82: Auxiliary buffer mechanism support; 83: Shim; 84: Fixing bolt; 85: First nut; 86: Second nut; 92: Fixing plate; 93: Lower shim; G: Insulating medium; W: Rotation direction.

Claims

1. An opening and closing device comprising: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; the first container housing at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; the second container housing at least the second movable contact and being arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; the third container housing at least the third movable contact and being arranged side by side with the second container; a crankshaft that causes the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism to act, thereby changing the first movable contact, the second movable contact, and the third movable contact between a closed state and an open state; an operation mechanism arranged on the first transmission mechanism side that rotates the crankshaft; and a buffer mechanism arranged on the third transmission mechanism side that buffers the rotation of the crankshaft by stopping the movement of a buffer mechanism crank that rotates in the same direction as the rotation direction of the crankshaft in the rotation direction of the crankshaft.

2. The opening and closing device according to claim 1, wherein the first transmission mechanism includes: a first operation lever connected to the first movable contact; a first crank lever connected to the crankshaft and rotating in accordance with the rotation of the crankshaft; and a first insulation operation lever that converts the rotation of the first crank lever into the movement of the first operation lever, the second transmission mechanism includes: a second operation lever connected to the second movable contact; a second crank lever connected to the crankshaft and rotating in accordance with the rotation of the crankshaft; and a second insulation operation lever that converts the rotation of the second crank lever into the movement of the second operation lever, and the third transmission mechanism includes: a third operation lever connected to the third movable contact; a third crank lever connected to the crankshaft and rotating in accordance with the rotation of the crankshaft; and a third insulation operation lever that converts the rotation of the third crank lever into the movement of the third operation lever.

3. An opening and closing device comprising: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; the first container housing at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; the second container housing at least the second movable contact and being arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; the third container housing at least the third movable contact and being arranged side by side with the second container; a crankshaft that causes the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism to act, thereby changing the first movable contact, the second movable contact, and the third movable contact between a closed state and an open state; an operation mechanism arranged on the first transmission mechanism side that rotates the crankshaft; and a buffer mechanism arranged on the third transmission mechanism side that buffers the rotation of the crankshaft by stopping the movement of a buffer mechanism crank that rotates in the same direction as the rotation direction of the crankshaft in the rotation direction of the crankshaft. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ a buffering mechanism configured on the side of the third transmission mechanism, which buffers the rotational movement of the crankshaft, the crankshaft has a first crank rod, a second crank rod, and a third crank rod, which are respectively provided corresponding to the first movable contact, the second movable contact, and the third movable contact, and each of the first crank rod, the second crank rod, and the third crank rod has a certain thickness, the first crank rod and the second crank rod are connected via a first coupling, and the second crank rod and the third crank rod are connected via a second coupling, the second moment of area of the third crank rod around the rotation axis is smaller than the second moment of area of the second crank rod around the rotation axis, and the second moment of area of the second crank rod around the rotation axis is smaller than the second moment of area of the first crank rod around the rotation axis.

4. An opening and closing device comprising: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; the first container housing at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; the second container housing at least the second movable contact and being arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; the third container housing at least the third movable contact and being arranged side by side with the second container; a crankshaft that causes the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism to act, thereby changing the first movable contact, the second movable contact, and the third movable contact between a closed state and an open state; an operation mechanism configured on the side of the first transmission mechanism, which causes the crankshaft to rotate; and a buffering mechanism configured on the side of the third transmission mechanism, which buffers the rotational movement of the crankshaft, the second moment of area of the crankshaft around the rotation axis tends to be smaller the farther away from the operation mechanism.

5. The opening and closing device according to any one of claims 1 to 4, wherein a position adjustment mechanism that adjusts the position of the buffering mechanism is further provided.

6. An opening and closing device comprising: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; the first container housing at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; the second container housing at least the second movable contact and being arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; the third container housing at least the third movable contact and being arranged side by side with the second container; a crankshaft that causes the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism to act, thereby changing the first movable contact, the second movable contact, and the third movable contact between a closed state and an open state; an operation mechanism configured on the side of the first transmission mechanism, which causes the crankshaft to rotate; and a damping mechanism configured on the side of the third transmission mechanism, which damps the rotational movement of the crankshaft, the opening and closing device further includes a position adjustment mechanism that adjusts the position of the damping mechanism, the damping mechanism further includes: a roller member provided to the crankshaft and rotating with the rotation of the crankshaft; a damping member that absorbs the energy of the rotational movement of the crankshaft by contacting the roller member; and a support member that supports the damping member, the position adjustment mechanism includes a threaded portion that engages with a tooth provided to the support member, and adjusts the relative positional relationship of the damping member with respect to the roller member.

7. An opening and closing device including: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; the first container housing at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; the second container housing at least the second movable contact and being arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; the third container housing at least the third movable contact and being arranged side by side with the second container; a crankshaft that causes the first, second, and third transmission mechanisms to act, thereby changing the first, second, and third movable contacts between the closed state and the open state; an operation mechanism configured on the side of the first transmission mechanism, which causes the rotational movement of the crankshaft; and a damping mechanism configured on the side of the third transmission mechanism, which damps the rotational movement of the crankshaft, the opening and closing device further includes a position adjustment mechanism that adjusts the position of the damping mechanism, the damping mechanism further includes: a roller member provided to the crankshaft and rotating with the rotation of the crankshaft; a damping member that absorbs the energy of the rotational movement of the crankshaft by contacting the roller member; a support member that supports the damping member; and a stand that maintains the relative positional relationship with respect to the crankshaft, and has the support member fixed thereto, the position adjustment mechanism includes a gasket sandwiched between at least either the support member and the stand or the support member and the damping member, which adjusts the relative positional relationship of the damping member with respect to the roller member.

8. An opening and closing device including: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; the first container housing at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; the second container housing at least the second movable contact and being arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; the third container housing at least the third movable contact and being arranged side by side with the second container; a crankshaft that causes the first movable contact, the second movable contact, and the third movable contact to change between the closed state and the open state by causing the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism to operate; an operation mechanism that is disposed on the first transmission mechanism side and causes the crankshaft to rotate; and a buffer mechanism that is disposed on the third transmission mechanism side and buffers the rotation of the crankshaft, the operation mechanism includes: a power source that supplies power to the crankshaft; and a buffer that buffers the rotation of the crankshaft, in a case where the open position of the first movable contact, the second movable contact, and the third movable contact in the open operation in which the first movable contact, the second movable contact, and the third movable contact change from the closed state to the open state is set to 0% and the closed position is set to 100%, and the movable contact position of the first movable contact, the second movable contact, and the third movable contact is defined by percentage, an arbitrary movable contact position of 15% or more and 25% or less is set as the brake start position of the buffer with respect to the crankshaft.

9. The opening and closing device according to claim 8, wherein the buffer and the buffer mechanism start buffering the rotation of the crankshaft closer to the movable contact that reaches the brake start position first between the first movable contact and the third movable contact than farther away.

10. An opening and closing device including: a first movable contact housed in a first container; a first transmission mechanism connected to the first movable contact; a first container that houses at least the first movable contact; a second movable contact housed in a second container; a second transmission mechanism connected to the second movable contact; a second container that houses at least the second movable contact and is arranged side by side with the first container; a third movable contact housed in a third container; a third transmission mechanism connected to the third movable contact; a third container that houses at least the third movable contact and is arranged side by side with the second container; a crankshaft that causes the first movable contact, the second movable contact, and the third movable contact to change between the closed state and the open state by causing the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism to operate; an operation mechanism that is disposed on the first transmission mechanism side and causes the crankshaft to rotate; and a buffer mechanism that is disposed on the third transmission mechanism side and buffers the rotation of the crankshaft, the operation mechanism includes: a power source that supplies power to the crankshaft; and a buffer that buffers the rotation of the crankshaft, the maximum value of the brake force of the buffer is 50% or more and 70% or less of the maximum value of the brake force of the buffer mechanism.

Images