Mechanical interlocking device of opening and closing device

Abstract

In order to provide a mechanical interlocking device for an opening and closing device, which can reliably prevent simultaneous closing of a circuit breaker and a ground switch without affecting the switching functions of the circuit breaker and the ground switch even if the mechanical interlocking device is provided between the circuit breaker and the ground switch, this mechanical interlocking device for an opening and closing device is provided with: a ball screw that is provided with a ball screw; the rotating shaft is connected with an operation shaft of the circuit breaker and rotates along with opening and closing of the circuit breaker; a ball screw nut that is screwed to the ball screw and moves in the axial direction of the ball screw in accordance with the rotation of the ball screw; a nut member fixed to the ball screw nut, having a sleeve, and moving together with the ball screw nut; a rack which is connected to a first cable connected to the ground switch and has a concave-convex portion formed in a portion thereof; the gear is meshed with the concave-convex part of the rack; a fork, one end of which is connected to the gear and the other end of which is formed with a groove into which the sleeve is inserted, the fork rotating the gear by moving the sleeve inside the groove in accordance with the movement when the ball screw nut moves in the axial direction in accordance with the opening / closing operation of the circuit breaker, and moving the first cable up and down via the rack; a lever which is supported so as to be rotatable about the center thereof, and which has one end engaged with or not engaged with the nut member and the other end connected to a second cable connected to the ground switch in accordance with the opening / closing operation of the ground switch; and a spring provided between the lever and a support plate that supports the second cable.

Description

Technical Field

[0001] The present invention relates to a mechanical interlocking device for a switchgear, and in particular to a mechanical interlocking device for a switchgear suitable for the following scenario: the device is configured to be arranged between a circuit breaker and a grounding switchgear for a gas-insulated switchgear, wherein the grounding switchgear cannot be operated when the circuit breaker is in a closed position, and the circuit breaker cannot be operated when the grounding switchgear is in a closed position. Background Art

[0002] A gas-insulated switchgear uses a circuit breaker that is filled with gas and surrounded by at least one metal. The circuit breaker is used to disconnect electrical equipment from a high-voltage line to ensure safe operation and maintenance of the electrical equipment in a no-load state.

[0003] Furthermore, from the viewpoint of safety, in order to provide safer operation and maintenance, at least one grounding switch can be used together with the circuit breaker, and as a result, capacitive current or inductive current is isolated.

[0004] Furthermore, in order to avoid phases that cause ground faults, the circuit breaker and the grounding switch are not allowed to be closed simultaneously.

[0005] Usually, an electric interlock device is provided between the circuit breaker and the grounding switch, and the electric interlock device cuts off the current supply to the motors driving the circuit breaker operator and the grounding switch operator to interlock the circuit breaker operator and the grounding switch operator.

[0006] However, since the electrical interlock device loses its function when an electrical component fails, a mechanical interlock device is provided between the circuit breaker and the grounding switch in order to improve reliability.

[0007] For example, Patent Document 1 discloses the following interlocking device for a switch: in order to reliably perform mechanical interlocking between operators separated by an arbitrary distance, in the operator that rotates the operating shaft of the switch to operate, mechanical interlocking is performed so that when one switch is closed or opened, the other switch cannot be closed or opened. In the interlocking device for the switch, the operators of the two switches are connected by a flexible tube containing a flexible wire, so that as the switch of one is operated, a lock pin is driven to prevent the gate of the other switch from being opened, thereby mechanically interlocking the two operators.

[0008] In addition, the following interlocking device of a switch provided with a locking structure is recorded in Patent Document 2: in order to obtain an interlocking device between multiple switches required by using power supply and distribution circuits of multiple systems, among a first switch, a second switch and a third switch, the opening and closing actions of the switches are transmitted to each other with the other switches via an interlocking line, and through the closing action of the second switch, the driving member of the first switch moves to the first position, and through the closing action of both the second switch and the third switch, the driving member of the first switch moves to the second position, and when the driving member of the first switch moves to the second position, the closing action of the first switch is constrained.

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 60-167220

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 7-193923 Summary of the invention

[0011] Problems to be solved by the invention

[0012] In addition, the mechanical interlocking device is designed so that the operating part blocks the shaft or rod in the main operating part of the opening and closing device, so the blocking force becomes very large, and is designed so that the blocking part blocks the part moving together with the movable contact of the opening and closing device.

[0013] Therefore, if there is always a gap between the blocking parts, then in the blocking state, if the opening and closing device is to be closed by a motor or manual operation, the movement of the movable contact of the opening and closing device will become smaller and the sensing distance may be reduced, which may affect the sensing performance of the opening and closing device.

[0014] In addition, due to the layout of the gas-insulated switchgear substation, when the circuit breaker and the grounding switch are far away from each other and are set at different positions, it becomes very difficult to connect the mechanical interlocking device set between the circuit breaker and the grounding switch. For example, even if the connection can be made, the connection structure becomes complicated, which may increase the cost and reduce the reliability.

[0015] However, neither of the above-mentioned Patent Documents 1 and 2 describes a solution to such a problem.

[0016] The present invention is made in view of the above-mentioned problems, and its object is to provide a mechanical interlocking device for a switching device, which can reliably prevent the circuit breaker and the grounding switch from being closed at the same time without affecting the switching functions of the circuit breaker and the grounding switch even if a mechanical interlocking device is provided between the circuit breaker and the grounding switch.

[0017] Means used to solve problems

[0018] In order to achieve the above-mentioned purpose, the mechanical interlocking device of the switching device of the present invention is arranged between the circuit breaker and the grounding switch, and the switching operation of the circuit breaker and the grounding switch are mechanically interlocked. The mechanical interlocking device of the switching device is characterized in that it comprises: a ball screw connected to the operating shaft of the circuit breaker and rotating with the opening and closing of the circuit breaker; a ball screw nut screwed with the ball screw and moving in the axial direction of the ball screw with the rotation of the ball screw; a nut part fixed to the ball screw nut and having a sleeve, and the nut part moves together with the ball screw nut; a rack connected to the first cable connected to the grounding switch, and A portion of the rack is formed with a concave-convex portion; a gear meshing with the above-mentioned concave-convex portion of the rack; a fork, one end of which is connected to the gear and the other end of which is formed with a groove for inserting the above-mentioned sleeve, when the above-mentioned ball screw nut moves in the axial direction with the opening and closing operation of the above-mentioned circuit breaker, the above-mentioned sleeve moves in the above-mentioned groove with the movement, thereby rotating the above-mentioned gear and causing the above-mentioned first cable to move up and down via the above-mentioned rack; a rod is supported to be rotatable at a substantially central portion, one end of the rod is engaged or unengaged with the above-mentioned nut part with the opening and closing operation of the above-mentioned grounding switch, and the other end of the rod is connected to a second cable connected to the above-mentioned grounding switch; and a spring is arranged between the rod and a support plate supporting the above-mentioned second cable.

[0019] Effects of the Invention

[0020] According to the present invention, even if a mechanical interlock device is provided between the circuit breaker and the earthing switch, it is possible to reliably prevent the circuit breaker and the earthing switch from being closed simultaneously without affecting the switching functions of the circuit breaker and the earthing switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view showing the first embodiment of the mechanical interlocking device of the opening and closing device of the present invention.

[0022] Figure 2 It is along Figure 1 Cross-sectional view of line A-A'.

[0023] Figure 3 is from Figure 1 A diagram of the periphery of the gear box in which the cover is removed from the gear box and the vicinity of the first cable is shown as a cross section.

[0024] Figure 4 It is along Figure 1 Cross-sectional view of line BB'.

[0025] FIG. 5( a ) is a front view showing a state where the circuit breaker is opened in the first embodiment of the mechanical interlock device of the switchgear of the present invention.

[0026] FIG. 5( b ) is a front view showing a state where the circuit breaker is closed in the first embodiment of the mechanical interlock device of the switchgear of the present invention.

[0027] FIG. 6( a ) is a front view showing a state where the grounding switch is opened in the first embodiment of the mechanical interlock device of the switch device of the present invention.

[0028] FIG6(b) is a front view showing a state where the grounding switch is closed in the first embodiment of the mechanical interlock device of the switchgear of the present invention.

[0029] Description of symbols

[0030] 1…operating shaft of circuit breaker; 2…ball screw; 3…ball screw nut; 4…nut part; 5…guide rod; 6…cover plate; 7…bolt; 8…rod; 8a…end of rod; 9…compression spring; 10…support plate; 11…housing; 11a…wall of housing; 12a…first cable; 12a1…core wire of first cable; 12b…second cable; 13a…sleeve for first cable; 13b…sleeve for second cable; 14…cover; 15…fork; 15… a…groove with a U-shaped cross section; 16, 25…sleeve; 17…gear box; 18…gear; 18a…the concave and convex part of the gear; 19…plate; 20a, 20b, 27a, 27b…nut; 21…rack; 21a…the concave and convex part of the rack; 21b…the end of the rack; 21c…the long groove formed in the rack; 22, 28…screws; 23…guide screw; 26…washer; 30…stepped part; 31…stepped part; 100…mechanical interlocking device. DETAILED DESCRIPTION

[0031] Hereinafter, the mechanical interlocking device of the opening and closing device of the present invention will be described based on the illustrated embodiment. In addition, in each figure, the same reference numerals are used for the same components.

[0032] [Example 1]

[0033] exist Figure 1 , Figure 2 , Figure 3 and Figure 4 Detailed Description of the Preferred Embodiment 1 of the Mechanical Interlocking Device 100 for an Opening and Closing Device of the Present Invention is Shown in FIG.

[0034] Figure 1 1 is a front view showing a first embodiment of a mechanical interlocking device 100 of an opening and closing device of the present invention, Figure 2 It is along Figure 1 A-A' line cross-sectional view, Figure 3 is from Figure 1 The cover 14 is removed from the gear box 17 from the state, and the vicinity of the first cable 12a is shown as a cross-section of the gear box 17 and its surroundings. Figure 4 Indicates along Figure 1 Cross-sectional view of line BB'.

[0035] In the mechanical interlocking device 100 of the switch device of this embodiment shown in the figure, the circuit breaker (not shown) has its operating shaft 1 connected to the ball screw 2 constituting the mechanical interlocking device 100, and the grounding switch (not shown) is connected to the first cable 12a and the second cable 12b.

[0036] Furthermore, the mechanical interlock device 100 is provided between the circuit breaker and the grounding switch, and mechanically interlocks the opening and closing operations of the circuit breaker and the grounding switch.

[0037] The following is a specific description.

[0038] Figure 1 , Figure 2 , Figure 3 and Figure 4 The mechanical interlocking device 100 of the present embodiment shown is roughly configured to include: a ball screw 2, which is connected to the operating shaft 1 of the circuit breaker and rotates as the circuit breaker is opened and closed (the two ends of the ball screw 2 are supported by ball bearings so as to be rotatable); a ball screw nut 3, which is screwed (threadedly fixed) with the ball screw 2 and moves in the axial direction of the ball screw 2 as the ball screw 2 rotates; a nut part 4, which is fixed to the ball screw nut 3 and has a sleeve 16, and moves together with the ball screw nut 3 (the sleeve 16 is loaded in the nut part 4); a rack 21, which is connected to the first cable 12a connected to the grounding switch, and a concave-convex portion 21a is formed on a part of the rack 21; a gear 18, which is formed with a concave-convex portion 18a that meshes with the concave-convex portion 21a of the rack 21, and is rotatably supported by a ball bearing; a fork 15, one end of which is A groove 15a having a U-shaped cross section is formed at the other end thereof for inserting a sleeve 16. When the ball screw nut 3 moves in the axial direction with the opening and closing operation of the circuit breaker, the sleeve 16 moves in the groove 15a having a U-shaped cross section with the axial movement, thereby rotating the gear 18, and the first cable 12a moves up and down through the engagement of the concave-convex portion 18a of the gear 18 with the concave-convex portion 21a of the rack 21; a rod 8 is rotatably supported by the housing 11 at a substantially central portion by a bolt 7, one end of which is engaged or unengaged with the nut part 4 and the ball screw nut 3 (details will be described later) with the opening and closing operation of the grounding switch, and the other end is connected to the second cable 12b connected to the grounding switch; and a compression spring 9 is provided along the second cable 12b between the rod 8 and the support plate 10 supporting the second cable 12b.

[0039] In addition, the connection between the first cable 12a and the rack 21 is as follows: Figure 3As shown, the core wire 12a1 of the first cable 12a is screwed into the end 21b of the rack 21, and the second cable 12b is connected to the rod 8 by inserting the core wire of the second cable 12b into a through hole (not shown) provided at the end 8a of the rod 8.

[0040] Furthermore, a long groove 21 c is formed in the longitudinal direction of the rack 21 on the side opposite to the side where the concavo-convex portion 21 a is formed, and a guide screw 23 for preventing the rack 21 from rotating is mounted in the long groove 21 c.

[0041] Furthermore, a guide rod 5 is provided in parallel with the ball screw 2 , and the nut part 4 is guided by the guide rod 5 so as to be movable in the axial direction together with the ball screw nut 3 , and the stability of the movement can be maintained.

[0042] In addition, at one end of the ball screw 2 and the guide rod 5 ( Figure 1 A cover plate 6 fixed to the housing 11 is provided, and the cover plate 6 supports the ball screw 2 and one end of the guide rod 5 ( Figure 1 In addition, both ends of the ball screw 2 are rotatably supported by ball bearings (not shown).

[0043] Furthermore, a plastic sleeve 25 is interposed between the rod 8 and the bolt 7 , and a plastic washer 26 is interposed between the rod 8 and the housing 11 near the bolt 7 , thereby reducing friction or wear between the rod 8 and the bolt 7 and between the rod 8 and the housing 11 .

[0044] Furthermore, the fork 15 is fixed to the housing 11 via a plate 19 .

[0045] Furthermore, the first cable 12 a and the second cable 12 b are respectively fixed to the wall 11 a of the housing 11 .

[0046] Specifically, the first cable 12a and the second cable 12b are covered by a first cable sleeve 13a and a second cable sleeve 13b, and the first cable sleeve 13a and the second cable sleeve 13b are fixed to the wall 11a of the housing 11 by screws 22 and 28, and the first cable sleeve 13a is fixed to the first cable 12a by two nuts 20a and 20b, and the second cable sleeve 13b is fixed to the first cable 12a by two nuts 27a (not shown in the figure) and 27b (see Figure 1 ) and is fixed to the second cable 12b.

[0047] Furthermore, the above-mentioned components constituting the mechanical interlock device 100 of the opening and closing device of the present embodiment are disposed in the housing 11 .

[0048] Next, the interlocking in the mechanical interlocking device 100 of the opening and closing device of the present embodiment will be described using FIG. 5( a ), FIG. 5( b ), FIG. 6( a ), and FIG. 6( b ).

[0049] As shown in Figures 5(a) and 5(b), the ball screw 2 rotates by operating the operating shaft 1 of the circuit breaker from the open state, and the ball screw nut 3 and the nut part 4 move in the axial direction. Subsequently, the sleeve 16 of the nut part 4 moves in the groove 15a with a U-shaped cross section, so that the circuit breaker becomes a closed state (the state of Figure 5(b)). In this state, the gear 18 connected to the fork 15 on the opposite side of the side where the groove 15a with a U-shaped cross section is formed rotates, and the concave-convex portion 18a of the gear 18 meshes with the concave-convex portion 21a of the rack 21, so that the rack 21 moves downward in Figures 5(a) and 5(b), and subsequently, the first cable 12a connected to the rack 21 moves downward, and the grounding switch becomes an open state (the state of Figure 6(a)).

[0050] Furthermore, when the grounding switch switches from an open state (the state of Figure 6(a)) to a closed state (the state of Figure 6(b)), the end of the second cable 12b moves downward, causing the rod 8 to rotate in a clockwise direction, whereupon the compression spring 9 is compressed between the rod 8 and the support plate 10 (the state of Figure 6(b)), and the end of the rod 8 on the opposite side of the side connected to the second cable 12b engages with the ball screw nut 3 and the nut part 4, thereby blocking the operation of the circuit breaker (the state of Figure 6(b)).

[0051] The operation of the circuit breaker is blocked in that a step portion 31 is formed when the ball screw nut 3 and the nut part 4 are screwed together, and an end portion 8a of the rod 8 on the opposite side of the side connected to the second cable 12b is formed with a step portion 31 to engage with the step portion 30 of the ball screw nut 3 and the nut part 4. The step portion 30 engages with the step portion 31, so that the operation of the circuit breaker is blocked.

[0052] On the other hand, when the grounding switch is switched from the closed state (the state of FIG. 6(b)) to the open state (the state of FIG. 6(a)), the end of the second cable 12b moves upward, and when the compression of the compression spring 9 is released (the state of FIG. 6(a)), the rod 8 rotates counterclockwise, whereby the engagement between the step portion 30 and the step portion 31 is released, thereby removing the obstruction to the operation of the circuit breaker (the state of FIG. 6(a)).

[0053] According to this embodiment, even if a mechanical interlock device is provided between the circuit breaker and the earthing switch, it is possible to reliably prevent the circuit breaker and the earthing switch from being closed simultaneously without affecting the switching functions of the circuit breaker and the earthing switch.

[0054] In addition, the present invention is not limited to the above-mentioned embodiments, but includes various modified examples. For example, the above-mentioned embodiments are described in detail in order to easily explain the present invention, and are not limited to all the structures described. In addition, a part of the structure of a certain embodiment can be added to the structure of other embodiments or the structure of other embodiments can be added. In addition, with respect to a part of the structure of each embodiment, other structures can be added / deleted / replaced.

Claims

1. A mechanical interlocking device for a switchgear, arranged between a circuit breaker and a grounding switchgear, for mechanically interlocking the switching operations of the circuit breaker and the grounding switchgear, The mechanical interlocking device of the above-mentioned opening and closing device is characterized in that: have: A ball screw connected to the operating shaft of the circuit breaker and rotating as the circuit breaker is opened or closed; A ball screw nut is threadedly engaged with the ball screw and moves in the axial direction of the ball screw as the ball screw rotates; A nut part, fixed to the ball screw nut, having a sleeve, and the nut part moves together with the ball screw nut; A rack connected to the first cable connected to the grounding switch, wherein a concave-convex portion is formed on a portion of the rack; a gear meshing with the concave-convex portion of the rack; a fork, one end of which is connected to the gear and the other end of which is formed with a groove for inserting the sleeve, so that when the ball screw nut moves in the axial direction in accordance with the opening and closing operation of the circuit breaker, the sleeve moves in the groove in accordance with the movement, thereby rotating the gear and causing the first cable to move up and down via the rack; A rod, the center of which is rotatably supported, one end of which is engaged or disengaged with the nut part as the grounding switch is opened or closed, and the other end of which is connected to a second cable connected to the grounding switch; and a spring disposed between the rod and a support plate supporting the second cable.

2. The mechanical interlocking device of the opening and closing device according to claim 1, characterized in that: The operating shaft is operated from a state in which the circuit breaker is open, so that the ball screw rotates, the ball screw nut and the nut part move in the axial direction, and accordingly, the sleeve moves in the groove, so that the circuit breaker becomes a closed state. In this state, the gear connected to the side opposite to the side of the fork where the groove is formed rotates, moves the rack downward, moves the first cable connected to the rack downward, and the grounding switch becomes an open state.

3. The mechanical interlocking device of the opening and closing device according to claim 2, characterized in that: When the grounding switch is switched from an open state to a closed state, the end of the second cable moves downward, causing the rod to rotate in a clockwise direction. Subsequently, the spring is compressed between the rod and the support plate, and the end of the rod on the opposite side to the side connected to the second cable engages with the ball screw nut and the nut part, thereby blocking the operation of the circuit breaker.

4. The mechanical interlocking device of the opening and closing device according to claim 3, characterized in that: The ball screw nut and the nut part form a step portion when they are screwed together, and the end of the rod on the opposite side of the side connected to the second cable is formed with a step portion to engage with the step portions of the ball screw nut and the nut part. The step portions engage with each other, and the operation of the circuit breaker is blocked.

5. The mechanical interlocking device of the opening and closing device according to claim 4, characterized in that: When the grounding switch is switched from a closed state to an open state, the end of the second cable moves upward and the compression of the spring is released, so that the rod rotates counterclockwise, whereby the engagement between the step portions is released, thereby removing the obstruction to the operation of the circuit breaker.

6. The mechanical interlocking device of the opening and closing device according to claim 5, characterized in that: The groove is formed in a U shape.

7. The mechanical interlocking device of the opening and closing device according to claim 6, characterized in that: The first cable is connected to the rack by screwing the core wire of the first cable into the end of the rack, and the second cable is connected to the rod by inserting the core wire of the second cable into a through hole provided at the end of the rod.

8. The mechanical interlocking device of the opening and closing device according to claim 7, characterized in that: A long groove is formed in the longitudinal direction of the rack on the side opposite to the side where the concavo-convex portion is formed, and a guide screw for preventing the rack from rotating is mounted in the long groove.

9. The mechanical interlocking device of the opening and closing device according to claim 8, characterized in that: A guide rod is provided in parallel with the ball screw, and the nut part is guided by the guide rod to move in the axial direction.

10. The mechanical interlocking device of the opening and closing device according to claim 9, characterized in that: The components constituting the mechanical interlocking device of the opening and closing device are arranged in the housing.

11. The mechanical interlocking device of the opening and closing device according to claim 10, characterized in that: A cover plate fixed to the housing is provided at one end of the ball screw and the guide rod, and the ball screw and the guide rod are supported by the cover plate.

12. The mechanical interlocking device of the opening and closing device according to claim 11, characterized in that: A plastic sleeve is provided between the rod and a bolt fixing the rod to the housing, and a plastic washer is provided between the rod and the housing near the bolt.

13. The mechanical interlocking device of the opening and closing device according to claim 12, characterized in that: The fork is fixed to the housing via a plate.

14. The mechanical interlocking device of the opening and closing device according to claim 13, characterized in that: The first cable and the second cable are respectively fixed to the housing.

15. The mechanical interlocking device of the opening and closing device according to claim 14, characterized in that: The first cable and the second cable are covered by a first cable sleeve and a second cable sleeve fixed to the housing. The first cable sleeve is fixed to the first cable, and the second cable sleeve is fixed to the second cable.

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