Switch

Abstract

A problem to be solved by the present invention is to provide a switch that can be replaced at low cost and has high earthquake resistance.SOLUTION: An opening and closing mechanism which is a link mechanism rotatable in forward and reverse directions by a driving force of an operating portion; a supporting portion which includes an insulating rod connected to the opening and closing mechanism and extending in an axial direction; a stationary side conductor which is electrically connected to a stationary side metal plate; a movable side conductor which is electrically connected to a movable side metal plate; a connecting portion which is provided inside the movable side conductor and connected to the insulating rod; and a connecting portion which is connected to the connecting portion and electrically connected to the movable side conductor, and a switching portion including a movable element provided at a position facing the fixed-side conductor, wherein the switching mechanism is housed in the support portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a switchgear installed in an electric power station such as a substation. [Background technology]

[0002] As demand for electricity continues to grow, power transmission systems are becoming larger in capacity and at ultra-high voltages. As a result, air switchgears used in power transmission systems are becoming larger, and air switchgears with larger overall heights are being used.

[0003] A pantograph type air switch is used as an air switch with a large overall height. A conventional pantograph type air switch 700 will be described using Fig. 10. Fig. 10 is a schematic configuration diagram of the pantograph type air switch 700. The pantograph type air switch 700 in Fig. 10 includes a base 710, an operating unit 720, a support unit 730, and an opening / closing unit 740.

[0004] The base 710 is provided on the ground and is the base of the pantograph type air switch 700. The base 710 is provided with studs 711 for attaching the support part 730.

[0005] The operating unit 720 is provided on the side of the stand 710. The operating unit 720 is a device that generates the driving force required to operate the opening / closing unit 740. The operating unit 720 includes a connecting link 721 for transmitting the driving force to the support unit 730.

[0006] The support part 730 is provided on the upper side of the base 710 via a stud 711. The support part 730 includes a plurality of support insulators 731 that support the opening / closing part 740, and one operation insulator 732 that receives a driving force from the operation part 720 via a connecting link 721 and transmits the driving force of the operation part 720 to the opening / closing part 740.

[0007] The opening / closing unit 740 is provided above the support unit 730. The opening / closing unit 740 includes an opening / closing mechanism 741 that rotates forward and reverse by the driving force of the operating unit 720 transmitted from the operation insulator 732, and a plurality of arms 742 whose link mechanism operates when the opening / closing mechanism 741 rotates forward and reverse. Each arm 742 is provided with a connecting pin 743 at its lower end to serve as a joint of the arm 742. Also, one connecting pin 744 is provided at the upper end of the arm 742 to serve as an intersection of the arms 742. An upper end 745 of the arm 742 moves up and down as the arm 742 moves about the connecting pins 743 and 744 when the opening / closing mechanism 741 rotates forward and reverse, and moves toward and away from a fixed contact portion 760 of the bus bar 750.

[0008] According to the above configuration, when the driving force of the operating unit 720 is transmitted to the opening / closing mechanism 741 via the connecting link 721 and the operation insulator 732, the opening / closing mechanism 741 rotates forward and backward. When the opening / closing mechanism 741 rotates forward and backward, the upper end 745 of the arm 742 moves up and down due to the operation of the link mechanism of the arm 742. When the upper end 745 of the arm 742 is in the uppermost position (when the arm 742 is extended), the upper end 745 of the arm 742 comes into contact with the fixed contact portion 760 of the bus bar 750, and the air contactor 700 is in a conductive state. On the other hand, when the upper end 745 of the arm 742 is not in the uppermost position (when the arm 742 is folded), the upper end 745 of the arm 742 moves away from the fixed contact portion 760 of the bus bar 750, and the air contactor 700 is in a non-conductive state.

[0009] In such a pantograph-type air contactor 700, if a large earthquake motion exceeding the design standard occurs when the arm 742 is extended (when the air contactor 700 is in a conducting state), a large moment will be generated in the air contactor 700, which may damage the support part 730 and the opening / closing part 740.

[0010] On the other hand, as a measure to enhance the earthquake resistance of the pantograph type air switchgear 700, it is known to replace it with a composite insulated switchgear having contacts inside the insulator. This has the advantage of having higher earthquake resistance than the pantograph type air switchgear 700. A conventional composite insulated switchgear 800 having contacts inside the insulator will be described with reference to FIG. 11. FIG. 11 is a partial elevational cross-sectional view showing the schematic configuration of the composite insulated switchgear 800 having contacts inside the insulator. The composite insulated switchgear 800 in FIG. 11 includes a frame 810, an opening / closing mechanism case 820, a support section 830, and an opening / closing section 840.

[0011] The base 810 is provided on the ground and is the base of the composite insulated switchgear 800. Inside the base 810, an operating unit 811 is housed, which generates the driving force required to operate the opening / closing unit 840 and transmits the driving force to the internal structure of the opening / closing mechanism case 820 via a connecting link 812.

[0012] The opening / closing mechanism case 820 is provided on the upper side of the stand 810. Inside the opening / closing mechanism case 820, an opening / closing mechanism 821 is housed, which receives a driving force from an operating unit 811 via a connecting link 812 and rotates forward and backward by the driving force of the operating unit 811.

[0013] The support part 830 is provided on the upper side of the opening and closing mechanism case 820. The support part 830 includes a support part porcelain tube 831. An insulating rod 832 connected to the upper end of the opening and closing mechanism 821 extends inside the support part porcelain tube 831.

[0014] The opening / closing unit 840 is provided above the support unit 830. The opening / closing unit 840 includes an opening / closing unit porcelain tube 841, a fixed-side metal cover 842 provided at the upper end of the opening / closing unit porcelain tube 841, and a movable-side metal plate 843 provided at the lower end of the opening / closing unit porcelain tube 841. The opening / closing unit 840 also includes, inside the opening / closing unit porcelain tube 841, a fixed-side conductor 844 electrically connected to the fixed-side metal plate 842, a fixed-side contact portion 845 provided at the lower end of the fixed-side conductor 844, and a movable-side conductor 846 electrically connected to the movable-side metal plate 843. The opening / closing unit 840 also includes, inside the movable-side conductor 846, a mover 847 facing the fixed-side contact portion 845 and electrically connected to the movable-side conductor 846, and a connecting portion 848 connecting the upper end of the insulating rod 832 and the lower end of the mover 847.

[0015] According to the above configuration, when the driving force of the operating unit 811 is transmitted to the opening / closing mechanism 821 via the connecting link 812, the opening / closing mechanism 821 rotates forward and backward. When the opening / closing mechanism 821 rotates forward and backward, the movable element 847 slides in the axial direction in conjunction with the insulating rod 832 and the connecting element 848. When the movable element 847 contacts the fixed-side contact element 845 (when the movable element 847 is in the uppermost position), the compound insulated switch 800 is in a conductive state. On the other hand, when the movable element 847 is separated from the fixed-side contact element 845 (when the movable element 847 is not in the uppermost position), the compound insulated switch 800 is in a non-conductive state.

[0016] However, when installing a composite insulated switch 800 as shown in Fig. 11, it is necessary to remove the frame 710 used for the pantograph type air switch 700 of Fig. 10 and then install a new frame 810 to be used for the composite insulated switch 800. Therefore, there has been a problem in that replacing the pantograph type air switch 700 with the composite insulated switch 800 requires a large amount of money.

[0017] Another known measure to improve earthquake resistance is to replace the pantograph-type air contactor 700 with a gas insulated switchgear (GIS). The gas insulated switchgear (GIS) has the advantage of being more earthquake-resistant than the pantograph-type air contactor 700, as well as being space-saving. However, installing the gas insulated switchgear (GIS) requires replacing the air contactor group and the transmission line group all at once. Therefore, replacing the air contactor group with a gas insulated switchgear (GIS) is problematic in that it requires a large amount of money.

[0018] Furthermore, as another measure for strengthening earthquake resistance, it is known to provide a vibration suppression device to the pantograph type air contactor 700. The vibration suppression device is advantageous in that it improves the earthquake resistance performance of the pantograph type air contactor 700 and can reduce damage caused by earthquake motion. However, while it can provide high earthquake resistance performance, the cost of introducing the vibration suppression device is high. Therefore, providing the pantograph type air contactor 700 with a vibration suppression device has the problem of requiring a large amount of money. [Prior art documents] [Patent documents]

[0019] [Patent Document 1] Patent No. 6916717 [Patent Document 2] Patent No. 4995143 Summary of the Invention [Problem to be solved by the invention]

[0020] Due to the above circumstances, there was a customer need to inexpensively implement earthquake resistance enhancement measures for the pantograph type air switchgear 700.

[0021] The present invention addresses these circumstances, and the problem that the present invention aims to solve is to provide a switchgear that is inexpensively replaceable and has high earthquake resistance. [Means for solving the problem]

[0022] In order to achieve the above object, the switch of this embodiment is a switch comprising: an opening / closing mechanism which is a link mechanism that can rotate forward and backward by the driving force of an operating unit; a support part connected to the opening / closing mechanism and including an insulating rod extending in the axial direction; a fixed-side conductor electrically connected to a fixed-side metal plate; a movable-side conductor electrically connected to a movable-side metal plate; a connection part provided inside the movable-side conductor and connected to the insulating rod; and a movable element connected to the connection part and electrically connected to the movable-side conductor and positioned opposite the fixed-side conductor, wherein the opening / closing mechanism is accommodated in the support part.

[0023] In addition, in order to achieve the above-mentioned object, the switch of this embodiment is characterized by comprising: a gear portion which is a rotating mechanism that can rotate forward and backward by the driving force of an operating portion; a support portion which is connected to the gear portion and includes an insulating rod extending in the axial direction; a fixed side conductor electrically connected to a fixed side metal plate; a movable side conductor electrically connected to a movable side metal plate; a feed screw mechanism which is provided inside the movable side conductor and connected to the insulating rod; and an opening / closing portion which includes a movable element which is connected to the feed screw mechanism and electrically connected to the movable side conductor and is provided in a position opposite the fixed side conductor. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a switch according to a first embodiment; [Figure 2] 2A and 2B are enlarged views of region P in FIG. 1, where (a) is a partial cross-sectional elevation view in a conductive state, (b) is a view taken along arrow BB in (a), (c) is a partial cross-sectional elevation view in a non-conductive state, and (d) is a view taken along arrow CC in (c). [Figure 3] 2A and 2B are enlarged views of an area Q in FIG. 1, where (a) is a partial cross-sectional elevation view in a conductive state, and (b) is a partial cross-sectional elevation view in a non-conductive state. [Figure 4]FIG. 10 is a cross-sectional view showing a schematic configuration of a switch according to a second embodiment. [Figure 5] FIG. 10 is a cross-sectional view showing a schematic configuration of a switch according to a third embodiment. [Figure 6] 6A and 6B are enlarged views of an area S in FIG. 5, in which (a) is a partial cross-sectional elevation view showing an example of a gear portion, (b) is a view taken along the arrow DD, (c) is a partial cross-sectional elevation view showing an example of a gear portion, and (d) is a view taken along the arrow EE. [Figure 7] 6A and 6B are examples of enlarged views of region T in FIG. 5, where (a) is a partial cross-sectional elevation view seen from the front in a conductive state, (b) is a partial cross-sectional elevation view seen from the side in a conductive state, (c) is a partial cross-sectional elevation view seen from the front in a non-conductive state, and (d) is a partial cross-sectional elevation view seen from the side in a non-conductive state. [Figure 8] 6A and 6B are examples of enlarged views of region T in FIG. 5, where (a) is a partial cross-sectional elevation view seen from the front in a conductive state, (b) is a partial cross-sectional elevation view seen from the side in a conductive state, (c) is a partial cross-sectional elevation view seen from the front in a non-conductive state, and (d) is a partial cross-sectional elevation view seen from the side in a non-conductive state. [Figure 9] 9A and 9B are enlarged views of an area U in FIGS. 7 and 8, where (a) is a partial cross-sectional elevation view of a bearing, (b) is a partial cross-sectional elevation view of a bearing showing a case where the insulating rod is short, and (c) is a partial cross-sectional elevation view of a bearing showing a case where the insulating rod is long. [Figure 10] FIG. 1 is a schematic diagram of a conventional pantograph-type air switch. [Figure 11] FIG. 10 is a partial cross-sectional elevation view showing a schematic configuration of a conventional composite insulated switch having contacts inside an insulator. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, a switch according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the following embodiment is an example of an embodiment of the present invention and is not intended to limit the scope of the invention. Furthermore, in the drawings referred to in the embodiments, identical parts or parts having similar functions are denoted by the same or similar reference numerals, and their description may be omitted. Furthermore, the dimensional ratios of the drawings may differ from the actual ratios, and some components may be omitted from the drawings.

[0026] (First embodiment) A switch 1 according to a first embodiment will be described with reference to Figs. 1 to 3. Fig. 1 is a cross-sectional view showing a schematic configuration of the switch 1 according to the first embodiment. Fig. 2 is an enlarged view of a region P in Fig. 1, where (a) is a partial cross-sectional elevation view in a conductive state, (b) is a view taken along arrow BB in (a), (c) is a partial cross-sectional elevation view in a non-conductive state, and (d) is a view taken along arrow CC in (c). Fig. 3 is an enlarged view of a region Q in Fig. 1, where (a) is a partial cross-sectional elevation view in a conductive state, and (b) is a partial cross-sectional elevation view in a non-conductive state.

[0027] 1, the switch 1 according to the first embodiment is provided on a base 710 of a conventional pantograph-type air switch 700, and includes an operating unit 10, a support unit 20, and a switching unit 30. That is, the switch 1 according to the first embodiment is a device that can be installed by utilizing the base 710 of the conventional pantograph-type air switch 700. The switch 1 according to the first embodiment is also different from a conventional composite insulated switch 800 in that it does not include a switching mechanism case 820. In the following description, the axial direction A of the switch 1 will be simply referred to as the axial direction, and the radial direction centered on the axial direction A of the switch 1 will be simply referred to as the radial direction.

[0028] The operating unit 10 is provided so as to be located radially outward from the axial direction of the base 710. Specifically, the operating unit 10 is suspended from the lower end of the support unit 20 by connecting the operating unit 10 and the lower end of the support unit 20 with the connecting unit 11 avoiding the studs 711. The operating unit 10 is a device that generates the driving force required to operate the opening / closing unit 30. The operating unit 10 includes a connecting link 12 that extends from the top surface of the operating unit 10 with the axial direction as the longitudinal direction and transmits the driving force to the support unit 20. The connecting link 12 rotates around the axial direction due to the driving force of the operating unit 10.

[0029] The support part 20 is configured so as to be installable on the upper side of a stand 710 via a stud 711. The support part 20 includes a support part porcelain pipe 21, a connecting link relay box 22, an opening / closing mechanism 23, and an insulating rod 24.

[0030] The support portion porcelain bushing 21 is a cylindrical member for structural support and electrical insulation, and may be a polymer porcelain bushing made of an organic material.

[0031] The connecting link relay box 22 is a member that extends from the lower end of the support portion porcelain tube 21 toward the upper end of the connecting link 12 so as to avoid the stud 711. That is, the connecting link relay box 22 is a member that extends radially outward from the lower end of the support portion porcelain tube 21 so as to avoid the stud 711. As shown in FIG. 2 , the connecting link relay box 22 includes a first relay link 22a whose longitudinal direction is the radial direction and a second relay link 22b whose longitudinal direction is the axial direction. One end of the first relay link 22a is connected to the upper end of the connecting link 12 by a gear mechanism, and the other end is connected to one end of the second relay link 22b by a gear mechanism. Furthermore, one end of the second relay link 22b is connected to the other end of the first relay link 22a by a gear mechanism, and the other end is connected to one end of the opening / closing mechanism 23 by a gear mechanism. That is, the first relay link 22a receives the rotational force of the connecting link 12 due to the driving force of the operation unit 10 and rotates around the horizontal direction, which is a direction perpendicular to the axial direction. The second relay link 22b receives the rotational force of the first relay link 22a and rotates around the axial direction. While the first embodiment has been described with reference to an example in which the connecting link 12, the first relay link 22a, the second relay link 22b, and the opening / closing mechanism 23 are connected by a gear mechanism, the present invention is not limited to this. For example, the connecting link 12, the first relay link 22a, the second relay link 22b, and the opening / closing mechanism 23 may be connected by a link mechanism.

[0032] The opening / closing mechanism 23 is a link mechanism that is composed of multiple links and joints and rotates forward and backward by the driving force of the operation unit 10. As shown in FIG. 2, one end of the opening / closing mechanism 23 is connected to the other end of the second relay link 22b, and the other end is connected to the lower end of the insulating rod 24. The opening / closing mechanism 23 is configured so that the end connected to the second relay link 22b is the fixed end 23a, and the end connected to the insulating rod 24 is the movable end 23b. The opening / closing mechanism 23 converts the rotational force received from the second relay link 22b into up and down movement of the movable end 23b around the fixed end 23a.

[0033] By devising the structures of the connecting link relay box 22 and the opening / closing mechanism 23 in this way, the opening / closing mechanism 23 is configured to be housed in the support portion porcelain tube 21. In other words, the opening / closing mechanism 23 is configured so that the conventional opening / closing mechanism case 820 is not required.

[0034] The insulating rod 24 is connected to the movable end 23b of the opening / closing mechanism 23 and extends axially inside the support portion porcelain tube 21. The insulating rod 24 is configured to be slidable in the axial direction in conjunction with the forward and reverse rotation of the opening / closing mechanism 23. That is, as shown in FIGS. 2(a) and 2(b), when the movable end 23b of the opening / closing mechanism 23 moves upward, the insulating rod 24 slides axially upward. Also, as shown in FIGS. 2(c) and 2(d), when the movable end 23b of the opening / closing mechanism 23 moves downward, the insulating rod 24 slides axially downward.

[0035] The opening / closing unit 30 is provided above the support unit 20. The opening / closing unit 30 includes a cylindrical opening / closing unit porcelain tube 31 for structural support and electrical insulation, a fixed-side metal cover 32 provided at the upper end of the opening / closing unit porcelain tube 31, and a movable-side metal plate 33 provided at the lower end of the opening / closing unit porcelain tube 31. The opening / closing unit 30 also includes a fixed-side conductor 34, a fixed-side contact portion 35, a movable-side conductor 36, a connecting portion 37, and a mover 38 inside the opening / closing unit porcelain tube 31. The opening / closing unit porcelain tube 31 may be a polymer porcelain tube made of an organic material.

[0036] The fixed-side conductor 34 is provided below the fixed-side metal plate 32 and is electrically connected to the fixed-side metal plate 32 .

[0037] The fixed-side contact portion 35 is provided at the lower end of the fixed-side conductor 34 and is electrically connected to the fixed-side conductor 34 .

[0038] The movable-side conductor 36 is provided on the upper side of the movable-side metal plate 33 and is electrically connected to the movable-side metal plate 33 .

[0039] The connecting portion 37 is provided inside the movable-side conductor 36 and is connected to the upper end of the insulating rod 24. The connecting portion 37 is configured to be slidable in the axial direction in conjunction with the insulating rod 24.

[0040] The mover 38 is provided inside the movable-side conductor 36 and is connected to the upper end of the connection portion 37. The mover 38 is electrically connected to the movable-side conductor 36. The mover 38 is also provided at a position facing the lower end of the fixed-side contact portion 35 and is configured to be slidable in the axial direction in conjunction with the connection portion 37. As a result, the mover 38 is configured to be able to come into contact with and separate from the lower end of the fixed-side contact portion 35 and to be electrically connectable to the fixed-side contact portion 35.

[0041] With the above configuration, when the driving force of the operating unit 10 is transmitted to the connecting link relay box 22 as a rotational force of the connecting link 12, the first relay link 22a and the second relay link 22b transmit the rotational force to the opening / closing mechanism 23. The opening / closing mechanism 23 converts the rotational force received from the connecting link relay box 22 into an up-and-down movement of the movable end 23b around the fixed end 23a. The insulating rod 24, the connecting portion 37, and the movable element 38 then slide axially in conjunction with the movement of the movable end 23b of the opening / closing mechanism 23. As a result, when the movable element 38 comes into contact with the fixed-side contact portion 35 (as shown in FIG. 3(a)), the switch 1 is brought into a conductive state. That is, an electrical path in the opening / closing unit 30 is formed in the following order: the fixed-side metal cover 32, the fixed-side conductor 34, the fixed contact portion 35, the movable element 38, the movable-side conductor 36, and the movable-side metal plate 33. On the other hand, when the movable element 38 is separated from the fixed contact portion 35 (as shown in FIG. 3(b)), the switch 1 is in a non-conductive state. That is, the electrical path in the switching unit 30 is interrupted between the fixed contact portion 35 and the movable element 38.

[0042] As described above, in the switch 1 of the first embodiment, earthquake resistance can be improved by improving the structures of the connecting link relay box 22 and the switch mechanism 23 to provide a lightweight configuration that does not require the switch mechanism case 820 of the conventional composite insulated switch 800. Furthermore, since the base 710 of the conventional pantograph type air switch 700 can be used to install the switch 1, the conventional pantograph type air switch 700 can be replaced with the switch 1 having high earthquake resistance at low cost.

[0043] Furthermore, the switchgear 1 of the first embodiment has a lightweight configuration that does not require the switching mechanism case 820 of the conventional composite insulated switchgear 800, and therefore can be transported in an assembled state with all components except for the frame 710 and studs 711 in Fig. 1. As a result, the assembly process at an electrical facility such as a substation can be reduced to just installing the switchgear 1 on the frame 710. In other words, the acceptance test at an electrical facility such as a substation can be minimized.

[0044] (Second embodiment) A switch 100 according to a second embodiment will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view showing a schematic configuration of the switch 100 according to the second embodiment. Hereinafter, differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals, and descriptions thereof will be omitted.

[0045] 4, the switch 100 according to the second embodiment is provided on a base 710 of a conventional pantograph-type air switch 700, and includes an operating unit 110, a support unit 20, and a switching unit 30. That is, the switch 100 according to the second embodiment differs from the switch 1 according to the first embodiment in the configuration of the operating unit 110.

[0046] The operation unit 110 is provided on the side surface of the pedestal 710. That is, in the first embodiment, the operation unit 110 is suspended from the lower end of the support unit 20 via the connecting unit 11, whereas in the second embodiment, the operation unit 110 is provided on the side surface of the pedestal 710 without using the connecting unit 11, which is a difference.

[0047] As described above, the switchgear 100 of the second embodiment has the same functions and effects as the first embodiment, and further reduces the weight of the switchgear 100 by eliminating the need for the connecting portion 11 in the operating portion 110. As a result, the earthquake resistance of the switchgear 100 can be further improved.

[0048] 2, the switchgear 100 can be transported in an assembled state, except for the frame 710, the studs 711, the operating unit 110, and the connecting link 12. As a result, the assembly process at an electric power station such as a substation can be limited to installing the switchgear 100 on the frame 710, attaching the operating unit 110 to the frame 710, and connecting the operating unit 110 and the switching mechanism 23 with the connecting link 12.

[0049] (Third embodiment) A switch 200 according to a third embodiment will be described with reference to FIGS. 5 to 7. FIG. 5 is a cross-sectional view showing a schematic configuration of the switch 200 according to the third embodiment. FIG. 6 is an example of an enlarged view of an area S in FIG. 5, where (a) is a partial cross-sectional elevation view showing an example of a gear portion, (b) is a view taken along the arrow DD, (c) is a partial cross-sectional elevation view showing an example of a gear portion, and (d) is a view taken along the arrow EE. FIG. 7 is an example of an enlarged view of an area T in FIG. 5, where (a) is a partial cross-sectional elevation view seen from the front in a conductive state, (b) is a partial cross-sectional elevation view seen from the side in a conductive state, (c) is a partial cross-sectional elevation view seen from the front in a non-conductive state, and (d) is a partial cross-sectional elevation view seen from the side in a non-conductive state. Hereinafter, differences from the first and second embodiments will be described, and portions similar to those in the first and second embodiments will be denoted with the same reference numerals, and descriptions thereof will be omitted.

[0050] 5, the switch 200 according to the third embodiment is provided on a base 710 of a conventional pantograph-type air switch 700, and includes an operation unit 10, a support unit 220, and an opening / closing unit 230. That is, the switch 200 according to the third embodiment is different from the switch 1 according to the first embodiment in the configurations of the support unit 220 and the opening / closing unit 230.

[0051] The support part 220 is configured so as to be installable on the upper side of the stand 710 via a stud 711. The support part 220 includes a support part porcelain tube 21, a connecting link relay box 22, a gear part 221, and an insulating rod 222.

[0052] Similar to the opening / closing mechanism 23 according to the first embodiment, the gear unit 221 is configured so as to eliminate the need for an opening / closing mechanism case 820. That is, the gear unit 221 is configured so as to be housed in the support unit porcelain tube 21. The gear unit 221 is a rotation mechanism formed of one or more gears and rotates forward and reverse by the driving force of the operation unit 10. Specifically, the gear unit 221 is connected to the operation unit 10 via the connecting link 12 and the connecting link relay box 22, and rotates forward and reverse in the rotation direction R as the link mechanism formed of the connecting link 12 and the links housed in the connecting link relay box 22 rotates forward and reverse by the driving force of the operation unit 10. The gear unit 221 is configured so that its rotation axis in the rotation direction R is aligned with the axial direction A of the switch 200.

[0053] 6(a) and 6(b), the gear portion 221 may be configured such that a small gear 221a-1 is disposed at a position overlapping with the axial direction A, and a large gear 221a-2 is disposed radially outward of the small gear 221a-1. In other words, the gear portion 221a may be configured to accelerate the forward and reverse rotation caused by the driving force of the operating unit 10.

[0054] 6(c) and 6(d), the gear portion 221 may be configured such that a large gear 221b-1 is disposed at a position overlapping with the axial direction A and a small gear 221b-2 is disposed radially outward of the large gear 221b-1. In other words, the gear portion 221b may be configured to decelerate the forward and reverse rotation caused by the driving force of the operating unit 10.

[0055] The insulating rod 222 is connected to the gear portion 221 along the rotation axis of the gear portion 221, and extends axially inside the support portion porcelain tube 21. The insulating rod 222 is configured to be rotatable in the rotation direction R in conjunction with the forward and reverse rotation of the gear portion 221.

[0056] The opening / closing part 230 is provided above the support part 220. The opening / closing part 230 includes a cylindrical opening / closing part porcelain tube 31 for structural support and electrical insulation, a fixed-side metal cover 32 provided at the upper end of the opening / closing part porcelain tube 31, and a movable-side metal plate 33 provided at the lower end of the opening / closing part porcelain tube 31. The opening / closing part 230 also includes a fixed-side conductor 34, a fixed-side contact part 35, and a movable-side conductor 231 inside the opening / closing part porcelain tube 31.

[0057] 7, the internal configuration of movable-side conductor 231 will be described. Opening / closing unit 230 includes, inside movable-side conductor 231, ball screw 232 (feed screw mechanism), connecting unit 233 (feed screw mechanism), and movable element 234.

[0058] The ball screw 232 is provided inside the movable-side conductor 231 and is connected to the upper end of the insulating rod 222. The ball screw 232 is configured to be rotatable in a rotation direction R in conjunction with the insulating rod 222. The ball screw 232 includes a ball screw shaft 235 and a ball screw nut 236.

[0059] The lower end of ball screw shaft 235 is connected to the upper end of insulating rod 222 via bearing 237, and the upper end is connected to bearing 238 protruding from the inner wall of movable-side conductor 231. Ball screw shaft 235 is configured to be rotatable in rotation direction R in conjunction with insulating rod 222.

[0060] Ball screw nut 236 is provided on ball screw shaft 235. Ball screw nut 236 is coupled to table 240, which is movable in the axial direction on rails 239 provided on the inner wall of movable-side conductor 231 with the axial direction as the longitudinal direction. That is, by being coupled to rails 239 and table 240, ball screw nut 236 is configured not to rotate in rotation direction R but to move axially on ball screw shaft 235. As a result, when ball screw shaft 235 rotates, ball screw nut 236 is configured to be movable axially on ball screw shaft 235 in accordance with the direction of rotation.

[0061] Connection portion 233 is provided inside movable-side conductor 231, and its lower end is coupled to ball screw 232. Specifically, the lower end of connection portion 233 is coupled to the upper end of ball screw nut 236. Connection portion 233 is configured to be slidable in the axial direction in conjunction with the axial movement of ball screw nut 236 on ball screw shaft 235.

[0062] The mover 234 is provided inside the moveable-side conductor 231 and is coupled to the upper end of the connection portion 233. The mover 234 is electrically connected to the moveable-side conductor 231. The mover 234 is also provided at a position facing the lower end of the fixed-side contact portion 35 and is configured to be slidable in the axial direction in conjunction with the connection portion 233. As a result, the mover 234 is configured to be able to come into contact with and separate from the lower end of the fixed-side contact portion 35 and to be electrically connectable to the fixed-side contact portion 35.

[0063] According to the above configuration, when the driving force of the operating unit 10 is transmitted to the gear unit 221 via the connecting link 12 and the connecting link relay box 22, the gear unit 221 rotates forward and backward. When the insulating rod 222 and the ball screw shaft 235 rotate in conjunction with the forward and backward rotation of the gear unit 221, the ball screw nut 236 moves axially on the ball screw shaft 235, and the connecting unit 233 and the movable element 234 slide axially. As a result, when the movable element 234 contacts the fixed-side contact element 35 (as in FIGS. 7(a) and 7(b)), the switch 200 is in a conductive state. That is, an electric circuit in the switch unit 230 is formed in the following order: the fixed-side metal cover 32, the fixed-side conductor 34, the fixed contact element 35, the movable element 234, the movable-side conductor 231, and the movable-side metal plate 33. On the other hand, when the movable element 234 separates from the fixed contact portion 35 (as in FIGS. 7(c) and 7(d)), the switch 200 is brought into a non-conductive state. That is, the electrical path in the switching portion 230 is interrupted between the fixed contact portion 35 and the movable element 234.

[0064] As described above, the switch 200 of the third embodiment has the same effects as the first embodiment, and in addition, by using the gear unit 221 instead of the switching mechanism 23 and rotating the insulating rod 222 and the like instead of sliding, it is possible to reduce the driving force required to slide the insulating rod 222 and the like, which are heavy objects, in the axial direction. As a result, by making the operating unit 10 smaller and reducing the number of parts, it is possible to further reduce the weight and replacement cost of the switch 200 and improve the reliability of the switch 200.

[0065] (Fourth embodiment) A switch 300 according to a fourth embodiment will be described with reference to Fig. 8. Fig. 8 is an example of an enlarged view of region T in Fig. 5, where (a) is a partial cross-sectional elevation view seen from the front in a conductive state, (b) is a partial cross-sectional elevation view seen from the side in a conductive state, (c) is a partial cross-sectional elevation view seen from the front in a non-conductive state, and (d) is a partial cross-sectional elevation view seen from the side in a non-conductive state. Hereinafter, differences from the first to third embodiments will be described, and portions similar to those of the first to third embodiments will be assigned the same drawing numbers and their description will be omitted.

[0066] As shown in FIG. 8, the switch 300 according to the fourth embodiment differs from the switch 200 according to the third embodiment in the configuration of the switching unit 330.

[0067] The opening / closing unit 330 includes a fixed-side conductor 34, a fixed-side contact portion 35, and a movable-side conductor 331 inside the opening / closing unit insulator tube 31. The opening / closing unit 330 includes a ball screw 332 (feed screw mechanism) and a mover 333 inside the movable-side conductor 331.

[0068] The ball screw 332 is provided inside the movable conductor 331 and is connected to the upper end of the insulating rod 222. The ball screw 332 is configured to be rotatable in a rotation direction R in conjunction with the insulating rod 222. The ball screw 332 includes a ball screw shaft 334 and a ball screw nut 335.

[0069] The lower end of the ball screw shaft 334 is connected to the upper end of the insulating rod 222 via a bearing 237. The ball screw shaft 334 is configured to be rotatable in a rotation direction R in conjunction with the insulating rod 222.

[0070] The ball screw nut 335 is provided on the ball screw shaft 334 and is coupled to the lower end of the mover 333. Because the ball screw nut 335 is coupled to the lower end of the mover 333, it is configured so that it does not rotate in the rotational direction R but moves axially on the ball screw shaft 334. As a result, when the ball screw shaft 334 rotates, the ball screw nut 335 is configured so that it can move axially on the ball screw shaft 334 in accordance with the direction of rotation. The reasons why the ball screw nut 335 does not rotate in the rotational direction R and why it is able to move axially on the ball screw shaft 334 will be described later.

[0071] The mover 333 is provided inside the movable-side conductor 331 and is coupled to the ball screw 332. The mover 333 is electrically connected to the movable-side conductor 331. The mover 333 is also provided at a position facing the lower end of the fixed-side contact portion 35 and is configured to be slidable in the axial direction in conjunction with the ball screw 332. As a result, the mover 333 is configured to be able to come into contact with and separate from the lower end of the fixed-side contact portion 35 and to be electrically connectable to the fixed-side contact portion 35.

[0072] Specifically, the mover 333 has a space 336 (fitting portion) in the middle thereof and a recess 337 (insertion portion) at the bottom end thereof.

[0073] Space 336 is formed in mover 333 at a position inside mover-side conductor 331, with its longitudinal direction in the axial direction. For example, one or more slits 338 are formed in the side surface of mover 333 corresponding to space 336, with its longitudinal direction in the axial direction. One or more fitting members 339 protruding from the inner wall of mover-side conductor 331 are fitted into these slits 338. With fitting members 339 fitted into slits 338, mover 333 is configured not to rotate in rotational direction R. In other words, ball screw nut 335 connected to the lower end of mover 333 also does not rotate in rotational direction R. Mover 333 is configured to be slidable in the axial direction within the range of space 336 and slits 338. In the fourth embodiment, the space 336 is formed in the mover 333 at a position inside the movable-side conductor 331, and the slit 338 that fits with the fitting member 339 is formed on the side surface of the mover 333 corresponding to the space 336. However, the present invention is not limited to this. For example, the mover 333 may be formed with a space having its longitudinal direction in the axial direction at a position inside the movable-side conductor 331, and the fitting member 339 may be fitted into the space. Alternatively, the mover 333 may be formed with one or more recesses (spaces) having their longitudinal direction in the axial direction at a position inside the movable-side conductor 331, and the fitting member 339 may be fitted into the recesses (spaces).

[0074] The recess 337 is formed as a recess extending from the lower end of the mover 333 toward the axially upward direction. The recess 337 is formed so that the upper end portion of the ball screw shaft 334 can be inserted therethrough. A ball screw nut 335 is coupled to the lower end of the mover 333, including the inlet surface of the recess 337. That is, the ball screw nut 335 is axially movable on the ball screw shaft 334 within the range of the recess 337, and the mover 333 is axially slidable within the range of the recess 337. Note that, in the fourth embodiment, the recess 337 is formed as a recess extending from the lower end of the mover 333 toward the axially upward direction, but this is not limiting. For example, a recess extending from the lower end of the mover 333 toward the axially upward direction may be connected to the space 336.

[0075] As a result, the movable member 333 is configured to be able to slide axially within the range of the space portion 336 and the slit 338, and within the range of the recess 337, in conjunction with the axial movement of the ball screw nut 335 on the ball screw shaft 334.

[0076] According to the above configuration, when the driving force of the operating unit 10 is transmitted to the gear unit 221 via the connecting link 12 and the connecting link relay box 22, the gear unit 221 rotates forward and backward. When the insulating rod 222 and the ball screw shaft 334 rotate in conjunction with the forward and backward rotation of the gear unit 221, the ball screw nut 335 moves axially on the ball screw shaft 334, and the mover 333 slides axially. As a result, when the mover 333 contacts the fixed-side contact unit 35 (as in FIGS. 8(a) and 8(b)), the switch 300 is in a conductive state. That is, an electric circuit in the switch unit 330 is formed in the following order: the fixed-side metal cover 32, the fixed-side conductor 34, the fixed contact unit 35, the mover 333, the mover 331, and the mover metal plate 33. On the other hand, when the mover 333 separates from the fixed-side contact unit 35 (as in FIGS. 8(c) and 8(d)), the switch 300 is in a non-conductive state. That is, the electrical path in the opening / closing unit 330 is interrupted between the fixed contact unit 35 and the movable element 333 .

[0077] As described above, the switch 300 of the fourth embodiment has the same effects as the first and third embodiments, and also simplifies the structures of the ball screw 332 and the mover 333, thereby reducing the number of parts constituting the switch unit 330. As a result, by reducing the number of parts of the switch unit 330, the weight and replacement cost of the switch 300 can be further reduced, and the reliability of the switch 300 can be improved.

[0078] (Fifth embodiment) A switch 400 according to a fifth embodiment will be described with reference to Fig. 9. Fig. 9 is an example of an enlarged view of region U in Figs. 7 and 8, where (a) is a partial cross-sectional elevation view of a bearing 410, (b) is a partial cross-sectional elevation view of the bearing 410 showing a case where the insulating rod 222 is short, and (c) is a partial cross-sectional elevation view of the bearing 410 showing a case where the insulating rod 222 is long. Hereinafter, differences from the first to fourth embodiments will be described, and portions similar to those in the first to fourth embodiments will be denoted with the same drawing numbers, and descriptions thereof will be omitted.

[0079] As shown in FIG. 9, a switch 400 according to the fifth embodiment differs from the switches 200 and 300 according to the third and fourth embodiments in the configuration of a bearing 410.

[0080] The bearing 410 is a bearing that connects the insulating rod 222 and the ball screw shafts 235 and 334 , and includes a shaft 411 and a case 412 .

[0081] The shaft 411 is a member that connects the upper end of the insulating rod 222 and the lower ends of the ball screw shafts 235 and 334. The shaft 411 includes a first portion 413, a second portion 414, and a third portion 415.

[0082] The first portion 413 is a lower end portion of the shaft 411, and is a portion that connects to the upper end of the insulating rod 222. A connecting hole 416 is formed in the side surface of the first portion 413 to connect the first portion 413 and the insulating rod 222. A recess 417 is formed in the upper end of the insulating rod 222 to fit the first portion 413, and a connecting hole 418 is formed in the side surface of the insulating rod 222 to connect the first portion 413 and the insulating rod 222. As a result, the first portion 413 and the insulating rod 222 can be fixed by fitting the first portion 413 into the recess 417 of the insulating rod 222 and then attaching a connecting pin 419 to the connecting holes 416 and 418.

[0083] The second portion 414 is an intermediate portion of the shaft 411, and its side surface is radially outward of the side surfaces of the first portion 413 and the third portion 415. The second portion 414 is formed with a recess 421 for receiving rotational support by the bearing 420.

[0084] The third portion 415 is an upper end portion of the shaft 411, and is a portion that connects to the lower ends of the ball screw shafts 235, 334. A recess 422 for fitting the third portion 415 is formed in the lower ends of the ball screw shafts 235, 334, and a key 423 for connecting the third portion 415 to the ball screw shafts 235, 334 is provided on the inner wall of this recess 422. As a result, the third portion 415 and the ball screw shafts 235, 334 can be fixed by fitting the third portion 415 into the recess 422 of the ball screw shafts 235, 334 and then key-coupling them with the key 423.

[0085] The case 412 is a component for supporting the rotation of the insulating rod 222, the ball screw shafts 235, 334, and the shaft 411, and includes a first case 424 and a second case 425.

[0086] The first case 424 is provided above the movable metal plate 33 via a stud 426, and its inner surface faces the outer surface of the second portion 414 of the shaft 411. A recess 427 is formed on the inner surface of the first case 424, in which a bearing 420 for rotatably supporting the shaft 411 and the like can be installed. The recess 427 is formed so that the height of the inner surface of the recess 427 is greater than the height of the bearing 420 on the outer surface. That is, the recess 427 is formed so that the length tolerance of the insulating rod 222 can be adjusted by changing the position of the bearing 420 relative to the recess 427. Specifically, assuming that an insulating rod 222 with an average length is used as shown in FIG. 9(a), if the insulating rod 222 is relatively long, the bearing 420 is installed above the recess 427 as shown in FIG. 9(b). On the other hand, if the insulating rod 222 is relatively short, the bearing 420 is installed below the recess 427 as shown in FIG. 9(c). As a result, even if there is a design variation in the length of the insulating rod 222, the shaft 411 and the like can be rotationally supported by the bearing 420 installed in the first case 424.

[0087] Second case 425 is provided above first case 424, and is provided so that its inner surface faces the outer surfaces of ball screw shafts 235, 335. Recesses 429 are formed on the inner surface of second case 425, in which bearings 428 for rotatably supporting ball screw shafts 235, 334, etc. can be installed. Furthermore, recesses 430 are formed on the outer surfaces of ball screw shafts 235, 334, in which the bearings 428 support the rotation. A presser plate 431 for fixing bearings 428 is provided on the upper surface of second case 425. As a result, the bearings 428 installed in second case 425 can rotatably support ball screw shafts 235, 334, etc.

[0088] As described above, the switch 400 of the fifth embodiment has the same functions and effects as the first, third, and fourth embodiments, and can be assembled even when there is design variation in the length of the insulating rod 222.

[0089] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0090] 1...switch, 10...operating portion, 11...connecting portion, 12...connecting link, 20...supporting portion, 21...supporting portion porcelain tube, 22...connecting link relay box, 22a...first relay link, 22b...second relay link, 23...opening / closing mechanism, 23a...fixed end, 23b...movable end, 24...insulating rod, 30...opening / closing portion, 31...opening / closing portion porcelain tube, 32...fixed side metal plate, 33...movable side metal plate, 34...fixed side Conductor, 35... fixed side contact portion, 36... movable side conductor, 37... connection portion, 38... movable element, 100... switch, 110... operation portion, 200... switch, 220... support portion, 221... gear portion, 222... insulating rod, 230... switch portion, 231... movable side conductor, 232... ball screw, 233... connection portion, 234... movable element, 235... ball screw shaft, 236... ball screw nut, 237... shaft receiver, 238... bearing, 239... rail, 240... table, 300... switch, 330... switch portion, 331... moving side conductor, 332... ball screw, 333... mover, 334... ball screw shaft, 335... ball screw nut, 336... space portion, 337... recess, 338... slit, 339... fitting member, 400... switch, 410... bearing, 411... shaft, 412... case , 413...first part, 414...second part, 415...third part, 416...connecting hole, 417...recess, 418...connecting hole, 419...connecting pin, 420...bearing, 421...recess, 422...recess, 423...key, 424...first case, 425...second case, 426...stud, 427...recess, 428...bearing, 429...recess, 430...recess, 431...pressure plate.

Claims

1. an opening / closing mechanism that is a link mechanism that can rotate forward and backward by a driving force of an operating unit, and a support unit that is connected to the opening / closing mechanism and includes an insulating rod that extends in the axial direction; an opening / closing unit including a fixed-side conductor electrically connected to a fixed-side metal plate, a movable-side conductor electrically connected to a movable-side metal plate, a connection part provided inside the movable-side conductor and connected to the insulating rod, and a mover connected to the connection part and electrically connected to the movable-side conductor, and provided at a position facing the fixed-side conductor; In a switch having A switch characterized in that the opening and closing mechanism is housed in the support part.

2. 2. The switch according to claim 1, wherein the support portion further includes a connecting link relay box that is a mechanism for transmitting a rotational force of the connecting link caused by a driving force of the operating portion to the opening / closing mechanism.

3. 2. The switch according to claim 1, wherein when the switching mechanism rotates forward or backward, the movable element is slidable in the axial direction in conjunction with the insulating rod and the connection portion, and is capable of contacting and separating from the fixed-side conductor.

4. a gear unit that is a rotation mechanism that can rotate forward and backward by a driving force of an operating unit, and a support unit that includes an insulating rod that is connected to the gear unit and extends in the axial direction; an opening / closing unit including a fixed-side conductor electrically connected to a fixed-side metal plate, a movable-side conductor electrically connected to a movable-side metal plate, a feed screw mechanism provided inside the movable-side conductor and connected to the insulating rod, and a mover connected to the feed screw mechanism and electrically connected to the movable-side conductor, and provided at a position facing the fixed-side conductor; In a switch having A switch characterized in that the gear portion is housed in the support portion.

5. 5. The switch according to claim 4, wherein when the gear portion rotates forward or backward, the movable element is slidable in the axial direction by the feed screw mechanism and is capable of contacting and separating from the fixed-side conductor.

6. The feed screw mechanism includes: a ball screw shaft connected to the insulating rod; a ball screw nut provided on the ball screw shaft and connected to a table movable in the axial direction on a rail provided on an inner wall of the movable conductor with the axial direction as a longitudinal direction; a connection portion having one end connected to the ball screw nut and the other end connected to the mover; 5. The switch according to claim 4, further comprising:

7. 7. The switch according to claim 6, wherein when the gear portion rotates forward or backward, the movable element is slidable in the axial direction as the ball screw nut moves axially on the ball screw shaft, and is capable of coming into contact with and separating from the fixed-side conductor.

8. The mover is one or more fitting portions formed in the movable element at a position inside the movable-side conductor, with the axial direction as a longitudinal direction, the fitting portions fitting with one or more fitting members protruding from an inner wall of the movable-side conductor; an insertion portion formed from a lower end of the mover toward an axially upward direction; Including, The feed screw mechanism includes: a ball screw shaft having one end connected to the insulating rod and the other end inserted into the insertion portion; a ball screw nut provided on the ball screw shaft and connected to the lower end of the mover; 5. The switch according to claim 4, further comprising:

9. 9. The switch according to claim 8, wherein, when the gear portion rotates forward or backward, the movable element is slidable in the axial direction as the ball screw nut moves axially on the ball screw shaft, and is capable of coming into contact with and separating from the fixed-side conductor.

10. a bearing that connects the insulating rod and the feed screw mechanism; The bearing is a shaft having one end fixed to a recess formed in the upper end of the insulating rod and the other end fixed to a recess formed in the lower end of the feed screw mechanism; a case facing an outer surface of the shaft, the case having a recess formed on its inner surface in which a bearing for supporting the shaft to rotate can be installed; 5. The switch according to claim 4, further comprising:

11. 11. The switch according to claim 1, which can be installed on a frame for a pantograph type air switch.

12. 11. The switch according to claim 1, wherein the support portion and the opening / closing portion have porcelain insulators made of polymer.

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