Switchgear

Abstract

To improve switch assembly workability.SOLUTION: A switch 100 includes a case 50 that houses an opening / closing mechanism, a porcelain tube 40 having a terminal insertion hole 45, a terminal member 11, a porcelain tube side engaging portion 48 formed on the inner peripheral surface of the terminal insertion hole 45, a terminal member side engaging portion 16 formed on the outer peripheral surface of the terminal member 11, and a packing 70 that is elastically deformable, seals between the porcelain tube 40 and the terminal member 11, intervenes at least between the porcelain tube side engaging portion 48 and the terminal member side engaging portion 16, and restrains the rotation of the terminal member 11 in the terminal insertion hole 45.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a switch. [Background technology]

[0002] A switchgear is installed in a power system to open and close the load current of the power system or power equipment such as transformers and disconnectors in the system under normal conditions, and protects equipment on the load side by interrupting the fault current in the event of an accident, and prevents the accident from spreading upstream. Switchgears are installed on electric circuits in the power system from power plants and substations, or on power receiving and distribution equipment of general consumers (see, for example, Patent Document 1). Switchgears are equipped with terminal members that can be electrically connected to external electric circuits. The terminal members are inserted into terminal insertion holes of a porcelain tube held in a switchgear case. Resin is filled between the terminal members and the terminal insertion holes of the porcelain tube to restrain the terminal members from rotating in the terminal insertion hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-204055 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned configuration, when assembling a switch, after inserting the terminal member into the terminal insertion hole of the porcelain tube, it is necessary to fill the space between the terminal member and the terminal insertion hole with resin and wait for the resin to harden. In addition, when the resin to be filled is a two-component resin, it is necessary to mix the main material and the hardener in a predetermined compounding ratio. For this reason, filling the resin is time-consuming and places a heavy burden on the worker, so it has been desired to improve the workability of assembling a switch.

[0005] In view of the above circumstances, an object of the present invention is to provide a switch capable of improving assembly workability. [Means for solving the problem]

[0006] The present invention one Aspects of The switch has a switching mechanism having a fixed electrode and a movable electrode that can come into contact with or be separated from the fixed electrode. The switch is , a case for accommodating an opening / closing mechanism The switch is The terminal is held in the case and has a terminal insertion hole extending in the axial direction that communicates between the inside and outside of the case. do insulator The switch is A terminal member that is inserted into a terminal insertion hole of a porcelain bushing, has a base end disposed inside the case and connected to a fixed electrode or a movable electrode, and has a tip end disposed outside the case and electrically connectable to an external electric circuit. The switch is A porcelain tube side engagement portion formed on the inner peripheral surface of the terminal insertion hole The switch is A terminal member side engagement portion formed on the outer peripheral surface of the terminal member The switch is The packing is elastically deformable, seals the gap between the porcelain tube and the terminal member, and is interposed at least between the porcelain tube side engaging portion and the terminal member side engaging portion to restrict rotation of the terminal member in the terminal insertion hole. N Prepare. The porcelain tube side engaging portion is recessed radially outward of the terminal insertion hole and has a groove extending in the axial direction. The terminal member side engaging portion has a protrusion protruding radially outward from the outer circumferential surface. The packing has a base portion that fits along the outer circumferential surface of the terminal member. The packing has a convex portion that protrudes radially outward from the base portion and is inserted into the groove. The packing has a recess formed on the inner circumferential surface of the base portion corresponding to the protrusion, and into which the protrusion is inserted.

[0008] A switch according to one aspect of the present invention comprises an opening / closing mechanism having a fixed electrode and a movable electrode capable of coming into contact with or being separated from the fixed electrode. The switch comprises a case that houses the opening / closing mechanism. The switch comprises a porcelain tube that is held in the case and has a terminal insertion hole that extends in an axial direction and communicates between the inside and outside of the case. The switch comprises a terminal member that is inserted into the terminal insertion hole of the porcelain tube, has a base end that is disposed inside the case and connected to the fixed electrode or the movable electrode, and has a tip end that is disposed outside the case and is electrically connectable to an external electric circuit. The switch comprises a porcelain tube side engaging portion formed on an inner circumferential surface of the terminal insertion hole. The switch comprises a terminal member side engaging portion formed on an outer circumferential surface of the terminal member. The switch comprises a packing that is elastically deformable, seals between the porcelain tube and the terminal member, and is interposed at least between the porcelain tube side engaging portion and the terminal member side engaging portion to restrict rotation of the terminal member in the terminal insertion hole. The porcelain bushing has an outward surface that faces the outside of the case in the axial direction. do. The terminal member has an inward surface facing the inside of the case in the axial direction and opposed to an outward surface. do. The packing has an airtight portion sandwiched between the outer surface of the porcelain tube and the inner surface of the terminal member. do. Effect of the Invention

[0009] According to the switch according to the above aspect, a packing is provided between the porcelain tube side engaging portion and the terminal member side engaging portion for restricting rotation of the terminal member in the terminal insertion hole, so that the rotation of the terminal member in the terminal insertion hole can be restricted. Since the packing is a molded body molded into a predetermined shape in advance, when assembling the switch, it is sufficient to sandwich the packing between the porcelain tube and the terminal member. As a result, the workability of assembling the switch can be improved.

[0010] In addition, in a configuration in which the packing has a convex portion to be inserted into the groove of the porcelain tube side engaging portion and a concave portion to be inserted into the protrusion of the terminal member side engaging portion, the rotation of the terminal member can be more firmly restrained by inserting the convex portion of the packing into the groove and the protrusion into the concave portion. In a configuration in which the convex portion has a curved surface and the dimension from the center of the terminal insertion hole increases from the first side to the second side in the axial direction, the convex portion of the packing can be easily inserted into the groove.

[0011] In a configuration in which the packing includes an airtight portion sandwiched between the outward surface of the porcelain tube and the inward surface of the terminal member, the sealing performance between the terminal member and the porcelain tube can be further improved. In a configuration in which a nut member is provided that engages with the male thread of the terminal member inserted into the terminal insertion hole to sandwich the inner peripheral wall portion between the inward surface, the terminal member can be firmly fixed in a state in which it is positioned on the porcelain tube. In a configuration in which the terminal member is integrally formed with the connection terminal portion, the intermediate conductor portion, and the contact mounting conductor portion, there is no need to assemble the terminal member itself, and the workability of assembling the switch can be improved. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view illustrating an example of a switch according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of a switch. [Diagram 3] 2 is a cross-sectional view showing a porcelain tube, a terminal member, and a packing of a switchgear. FIG. [Figure 4] FIG. [Diagram 5] 4 is a perspective view showing an enlarged diameter portion of a terminal member and a packing. FIG. [Figure 6] FIG. 4 is a cross-sectional view taken along the line II in FIG. [Figure 7] FIG. 4 is a cross-sectional view showing the relationship in diameter between a protrusion of a packing and a groove of a porcelain tube. [Figure 8] 4 is a cross-sectional view showing a state in which a convex portion of a packing attached to a terminal member is being inserted into a groove of a porcelain tube. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the contents described below. In addition, in order to explain the embodiment in the drawings, some parts are enlarged or emphasized, and the scale is appropriately changed to express it, and the dimensions and shape may differ from those of the actual product. FIG. 1 is a perspective view showing an example of a switch 100 according to the embodiment. FIG. 2 is a cross-sectional view showing an example of the switch 100. As shown in FIGS. 1 and 2, the switch 100 mainly includes a case 50 and a cover 60, a plurality of connection terminals 10, a porcelain tube 40, an opening and closing mechanism 20, and a packing 70.

[0014] As shown in FIG. 2, the case 50 accommodates the opening / closing mechanism 20. The case 50 is integrally provided with a bottom plate 51, side plates 52, and an upper plate 53. The bottom plate 51 forms the bottom surface of the case 50. The bottom plate 51 is formed in a rectangular shape when viewed from below. The side plates 52 form the outer peripheral side surfaces of the case 50. The side plates 52 extend upward from each of the four sides of the bottom plate 51. The upper plate 53 forms the upper surface of the case 50. The upper plate 53 of the case 50 extends from the upper ends of the four side plates 52 toward the inside of the case 50. The upper plate 53 is formed with an opening 55 that opens upward. The shape of the case 50 is arbitrary, and may be, for example, a circular shape when viewed from below, as long as it can accommodate the opening / closing mechanism 20. The material of the case 50 is not particularly limited, but metal materials, resin materials, etc. are used.

[0015] The cover 60 is disposed on the upper side of the case 50. The cover 60 is provided so as to close the opening 55 of the case 50. The inside of the case 50 to which the cover 60 is attached becomes a sealed space. A predetermined gas (e.g., an insulating gas, air, etc.) may be sealed in this sealed space, or a predetermined liquid (e.g., insulating oil, etc.) may be poured into the sealed space. As shown in FIG. 1 and FIG. 2, the cover 60 integrally includes a top plate portion 61, an inclined portion 62, and an outer peripheral plate portion 63. The top plate portion 61 is formed in the center of the cover 60. The top plate portion 61 forms the top of the cover 60. The top plate portion 61 is formed in a rectangular shape when viewed from above. The inclined portion 62 is inclined obliquely downward from each side of the rectangular top plate portion 61 toward the outer peripheral side. The outer peripheral plate portion 63 extends horizontally from the lower end of the inclined portion 62 toward the outer peripheral side. An outer peripheral plate portion 63 that forms the outer periphery of the cover 60 protrudes outward beyond the case 50 when viewed in the up-down direction.

[0016] As shown in FIG. 2, a cover packing 66 is sandwiched between the case 50 and the cover 60. The cover packing 66 extends along the outer periphery of the opening 55. The cover packing 66 is made of an elastic material such as resin or a rubber-based material. The cover 60 is fixed by a fixing member 80. The fixing member 80 fixes the cover 60 to the case 50. A plurality of fixing members 80 are arranged at intervals on the outer periphery of the cover 60. As shown in FIG. 1, in this embodiment, a total of six fixing members 80 are provided, two along each long side of the rectangular cover 60 when viewed from above, and one along each short side. The six fixing members 80 are arranged at equal or nearly equal intervals. The number and arrangement of the fixing members 80 to be used can be set arbitrarily.

[0017] As shown in FIG. 1 and FIG. 2, each fixing member 80 is formed of a plate-shaped metal material and is formed in an L-shape when viewed from the side. The fixing member 80 is not limited to being L-shaped when viewed from the side, and may be U-shaped or V-shaped when viewed from the side. The fixing member 80 may be arbitrarily shaped as long as it can lock the cover 60. One end 81 of the fixing member 80 is fastened to the side plate 52 of the case 50 by a bolt 88. The other end 83 of the fixing member 80 is aligned with the upper surface of the outer peripheral plate portion 63 of the cover 60 in a state where the one end 81 is fastened to the screw seat member 58 by the bolt 88. The other end 83 locks a part of the outer peripheral plate portion 63 of the cover 60 that compresses the cover packing 66 in a state where the one end 81 is fastened to the side plate 52 by the bolt 88.

[0018] A hanging bracket 90 is attached to the switch 100. The hanging bracket 90 hangs the switch 100 from a utility pole or an electric circuit (not shown). The hanging bracket 90 includes a pair of support plates 91, a connecting member 92, and a locking portion 93. The pair of support plates 91 are disposed on both sides in the long side direction of the case 50. The lower end portion of each support plate 91 is fastened to the side plate 52 of the case 50 by a fixing bolt 98.

[0019] Each support plate 91 extends above the top plate portion 61 of the cover 60. The connecting member 92 extends horizontally to connect a pair of support plates 91 together. The connecting members 92 are arranged at a distance in the up-down direction from the top plate portion 61 of the cover 60. The locking portion 93 extends upward from the connecting member 92. A hanging fitting for hanging the switchgear 100 from a utility pole or an electric circuit (not shown) is locked to the locking portion 93. The shape of the hanging bracket 90 is not limited to the above-mentioned configuration. The hanging bracket 90 may have any shape as long as it is capable of hanging the case 50.

[0020] As shown in Fig. 2, the multiple connection terminals 10 include supply side terminals 10A electrically connected to an electric circuit on the supply side of the power system, and demand side terminals 10B electrically connected to an electric circuit on the demand side of the power system. In this embodiment, the supply side terminals 10A and the demand side terminals 10B are arranged in a direction perpendicular to the paper surface of Fig. 2 for three phases. The shape (form) of the supply side terminals 10A and the demand side terminals 10B is arbitrary. Each connection terminal 10 (supply side terminals 10A and demand side terminals 10B) includes a terminal member 11 and a porcelain tube 40.

[0021] 3 is a cross-sectional view showing the porcelain tube 40, the terminal member 11, and the packing 70 of the switch 100. As shown in FIG. 3, the porcelain tube 40 is held in the case 50. The porcelain tube 40 is made of an insulating material such as ceramics. The porcelain tube 40 is formed into a cylindrical shape extending in the axial direction Da that communicates the inside and outside of the case 50 as a whole. The porcelain tube 40 integrally has an inner cylindrical portion 41, an outer cylindrical portion 42, and an intermediate cylindrical portion 43. In the following description, in the axial direction Da, the direction facing the inside of the case 50 is referred to as a first side Da1, and the direction facing the outside of the case 50 is referred to as a second side Da2.

[0022] The inner cylindrical portion 41 is formed at the end of the first side Da1 in the axial direction Da of the porcelain tube 40. The inner cylindrical portion 41 is formed in a cylindrical shape extending in the axial direction Da. The inner diameter of the inner cylindrical portion 41 is larger than the outer diameter dimensions of the intermediate conductor portion 13 and the contact mounting conductor portion 14 of the terminal member 11. An inner recess 41S that opens toward the inside of the case 50 in the axial direction Da is formed on the radially inner side of the inner cylindrical portion 41. A flange 44 that protrudes radially outward is integrally formed on the boundary of the inner cylindrical portion 41 with the intermediate cylindrical portion 43. The flange 44 extends continuously in the circumferential direction.

[0023] The outer cylindrical portion 42 is formed at the end of the second side Da2 in the axial direction Da in the porcelain tube 40. The outer cylindrical portion 42 is formed in a cylindrical shape extending in the axial direction Da. The inner diameter of the outer cylindrical portion 42 is larger than the outer diameter dimension of the connection terminal portion 12 of the connection terminal 10. In this embodiment, the outer diameter of the outer cylindrical portion 42 is larger than the outer diameter of the inner cylindrical portion 41. The outer diameter of the outer cylindrical portion 42 may be smaller than the outer diameter of the inner cylindrical portion 41. An outer recess 42S that opens toward the outside of the case 50 in the axial direction Da is formed on the radial inside of the outer cylindrical portion 42. An attachment groove 42m for attaching a terminal cover 110 described later is formed on the inner peripheral surface of the outer cylindrical portion 42. The attachment groove 42m is recessed radially outward from the inner peripheral surface of the outer cylindrical portion 42 and is continuous in the circumferential direction.

[0024] The intermediate cylindrical portion 43 is formed between the inner cylindrical portion 41 and the outer cylindrical portion 42 in the axial direction Da. The intermediate cylindrical portion 43 is cylindrical extending in the axial direction Da, and has a terminal insertion hole 45 formed therein. The terminal insertion hole 45 communicates with an inner recess 41S on the radially inner side of the inner cylindrical portion 41 and an outer recess 42S on the radially inner side of the outer cylindrical portion 42. The terminal insertion hole 45 communicates with the inside and the outside of the case 50. The inner diameter of the terminal insertion hole 45 is slightly larger than the outer diameter of the intermediate conductor portion 13 of the connection terminal 10, and is smaller than the inner diameter of the inner cylindrical portion 41 and the inner diameter of the outer cylindrical portion 42. A rib 46 that protrudes radially outward and is continuous in the circumferential direction is integrally formed on the outer periphery of the intermediate cylindrical portion 43. A plurality of ribs 46 are provided at intervals in the axial direction Da.

[0025] FIG. 4 is a perspective view showing the porcelain tube 40. As shown in FIGS. 3 and 4, a packing accommodating recess 47 is formed at the end of the terminal insertion hole 45 on the second side Da2 in the axial direction Da. The packing accommodating recess 47 is formed by expanding the diameter of the terminal insertion hole 45 radially outward in a portion facing the outer recess 42S of the outer cylindrical portion 42. The packing accommodating recess 47 is recessed from the recess bottom surface 42b facing the second side Da2 in the axial direction Da to the first side Da1 in the axial direction Da in the outer recess 42S on the radial inside of the outer cylindrical portion 42. The packing accommodating recess 47 opens toward the second side Da2 in the axial direction Da (the outer recess 42S). The inner diameter of the packing accommodating recess 47 is larger than the inner diameter of the terminal insertion hole 45 and smaller than the inner diameter of the outer cylindrical portion 42. The inner diameter of the packing accommodating recess 47 is constant in the axial direction Da. The packing accommodating recess 47 has an outward surface 47f that extends radially outward from the terminal insertion hole 45 and faces the second side Da2 in the axial direction Da. The outward surface 47f is formed along a plane perpendicular to the axial direction Da.

[0026] A porcelain tube side engaging portion 48 is formed in the packing accommodating recess 47 provided at the end of the terminal insertion hole 45. The porcelain tube side engaging portion 48 engages with a terminal member side engaging portion 16 of the terminal member 11 described later via a packing 70. The porcelain tube side engaging portion 48 has a groove 48m recessed radially outward from the inner peripheral surface of the packing accommodating recess 47 and extending in the axial direction Da. One or more grooves 48m are provided on the inner peripheral surface of the packing accommodating recess 47. In this embodiment, two grooves 48m are provided at equal intervals in the circumferential direction of the packing accommodating recess 47. The grooves 48m are provided above and below the inner peripheral surface of the packing accommodating recess 47. The grooves 48m may be configured such that the diameter dimension from the center of the terminal insertion hole 45 decreases from the outside of the case 50 toward the inside of the case 50 in the axial direction Da.

[0027] 3, the porcelain tube 40 is provided so as to penetrate a side plate 52 of the case 50. A part of the axial direction Da of the inner cylindrical portion 41 of the porcelain tube 40 protrudes from the side plate 52 to the inside of the case 50. The outer cylindrical portion 42 and the intermediate cylindrical portion 43 of the porcelain tube 40 protrude from the side plate 52 to the outside of the case 50.

[0028] The inner cylindrical portion 41 of the porcelain tube 40 is inserted into a through hole 52h formed in the side plate 52 via a retaining sleeve 57. The retaining sleeve 57 is formed of, for example, metal or resin. The retaining sleeve 57 integrally has a cylindrical wall portion 57a, an end wall portion 57b, and a flange wall portion 57c. The retaining sleeve 57 may have no end wall portion 57b. The cylindrical wall portion 57a ​​is formed in a cylindrical shape extending in the axial direction Da. The cylindrical wall portion 57a ​​is inserted into the through hole 52h of the side plate 52. The cylindrical wall portion 57a ​​is inserted and disposed in the through hole 52h. The end wall portion 57b extends radially inward from an end portion of the first side Da1 in the axial direction Da of the cylindrical wall portion 57a. A through hole 57h through which the terminal member 11 is inserted is formed in the center of the end wall portion 57b. The flange wall portion 57c extends radially outward from an end portion of the cylindrical wall portion 57a ​​on the second side Da2 in the axial direction Da. The flange wall portion 57c is disposed on the outer side of the case 50 with respect to the side plate 52.

[0029] The inner cylindrical portion 41 of the porcelain tube 40 is inserted from the outside of the case 50 into the radially inside of the retaining sleeve 57. The flange 44 provided on the inner cylindrical portion 41 abuts against a flange wall portion 57c of the retaining sleeve 57. Furthermore, the flange wall portion 57c abuts against the side plate 52 of the case 50. This flange wall portion 57c maintains airtightness between the case 50 and the porcelain tube 40.

[0030] The terminal member 11 has a base end 11a disposed within the case 50 and a tip end 11b protruding from the case 50 and disposed outside the case 50. The terminal member 11 integrally comprises a connection terminal portion 12, an intermediate conductor portion 13, and a contact mounting conductor portion 14. Note that the terminal member 11 is configured to integrally comprise the connection terminal portion 12, the intermediate conductor portion 13, and the contact mounting conductor portion 14, but for example, the connection terminal portion 12 and the intermediate conductor portion 13 may be separate from the contact mounting conductor portion 14 and connected to each other by an appropriate connection structure.

[0031] The connection terminal portion 12 is connected to an electric circuit on the supply side or the demand side of the power system. The connection terminal portion 12 is shaped like a shuttlecock extending in the axial direction Da. The electric circuit to be connected is fixed to the connection terminal portion 12 by a bolt or the like. The intermediate conductor portion 13 extends from the connection terminal portion 12 through the terminal insertion hole 45 of the porcelain tube 40 toward the inside of the case 50. The contact mounting conductor portion 14 extends continuously from the intermediate conductor portion 13 toward the inside of the case 50. As shown in FIG. 2, the contact mounting conductor portion 14 has a fixed electrode 21 or a movable electrode 22 attached thereto.

[0032] FIG. 5 is a perspective view showing the expanded diameter portion 15 of the terminal member 11 and the packing 70. As shown in FIGS. 3 and 5, the terminal member 11 has the expanded diameter portion 15 between the connection terminal portion 12 and the intermediate conductor portion 13. The expanded diameter portion 15 is expanded radially outward from the outer circumferential surface of the intermediate conductor portion 13. The expanded diameter portion 15 has a cylindrical shape extending in the axial direction Da. The expanded diameter portion 15 has an inward surface 15s facing the first side Da1 in the axial direction Da. The inward surface 15s is formed along a plane perpendicular to the axial direction Da. The inward surface 15s faces the outward surface 47f of the porcelain tube 40 in the axial direction Da.

[0033] The terminal member side engaging portion 16 is formed in the expanded diameter portion 15 forming a part of the terminal member 11. The terminal member side engaging portion 16 has a protrusion 16t protruding radially outward from the outer circumferential surface of the expanded diameter portion 15. One or more protrusions 16t are provided on the outer circumferential surface of the expanded diameter portion 15. In this embodiment, two protrusions 16t are provided at equal intervals in the circumferential direction. The protrusions 16t are provided above and below the expanded diameter portion 15. Note that, in this embodiment, the embodiment is described by taking as an example a form in which two protrusions 16t are provided on the outer circumferential surface of the expanded diameter portion 15, but is not limited to this form. For example, one protrusion 16t may be provided on the outer circumferential surface of the expanded diameter portion 15, or four protrusions 16t may be provided at equal intervals in the circumferential direction of the outer circumferential surface of the expanded diameter portion 15. Furthermore, three or five or more protrusions 16t may be provided at equal intervals in the circumferential direction of the outer circumferential surface of the expanded diameter portion 15. Furthermore, when multiple protrusions 16t are provided on the outer circumferential surface of the expanded diameter portion 15, they do not need to be spaced at equal intervals in the circumferential direction.

[0034] As shown in FIG. 3, the outer circumferential surface of the intermediate conductor portion 13 is provided with a male thread portion 17 having a screw groove. The male thread portion 17 is exposed inside the inner cylindrical portion 41 when the terminal member 11 is inserted into the terminal insertion hole 45 and the expanded diameter portion 15 is abutted against the outward surface 47f. The intermediate cylindrical portion 43 of the porcelain tube 40 is formed with an inner peripheral wall portion 43w extending radially inward. A nut member 49 is fastened to the male thread portion 17 of the terminal member 11. The nut member 49 abuts against the inner peripheral wall portion 43w. The terminal member 11 is fixed to the porcelain tube 40 by sandwiching the inner peripheral wall portion 43w between the inward surface 15s of the expanded diameter portion 15 and the nut member 49.

[0035] 2, the connection portion between the connection terminal portion 12 of the terminal member 11 and an external electric circuit (not shown) is covered by a terminal cover 110. The terminal cover 110 is attached to the outer cylindrical portion 42 of the porcelain tube 40. The terminal cover 110 is cylindrical and extends in the axial direction Da, and the diameter dimension gradually decreases from the first side Da1 toward the second side Da2 in the axial direction Da. The terminal cover 110 is made of an insulating rubber material, resin material, or the like.

[0036] One end 110a of the terminal cover 110 is directly attached to the outer cylindrical portion 42 of the porcelain tube 40. In this embodiment, the one end 110a is inserted, for example, into the radially inner side of the outer cylindrical portion 42. A protrusion (not shown) that protrudes radially outward and continues in the circumferential direction is integrally formed on the outer peripheral surface of the one end 110a. The protrusion (not shown) fits into a mounting groove 42m formed on the inner peripheral surface of the outer cylindrical portion 42. Note that the outer cylindrical portion 42 may be inserted into the radially inner side of the one end 110a of the terminal cover 110. In this case, a mounting groove may be provided on the outer peripheral surface of the outer cylindrical portion 42, and a protrusion that fits into the mounting groove may be provided on the inner peripheral surface of the one end 110a.

[0037] The opening / closing mechanism 20 is accommodated in a case 50. The opening / closing mechanism 20 includes a fixed electrode 21 and a movable electrode 22. The fixed electrode 21 is electrically connected to, for example, the demand side terminal 10B. In this embodiment, the fixed electrode 21 includes a pair of fixed contacts 24. The pair of fixed contacts 24 are provided on both sides of the contact mounting conductor portion 14 of the demand side terminal 10B. The lower ends of the pair of fixed contacts 24 are electrically connected to the contact mounting conductor portion 14.

[0038] The movable electrode 22 is electrically connected to, for example, the supply terminal 10A. The movable electrode 22 is configured to be able to come into contact with or separate from the fixed electrode 21. The movable electrode 22 integrally includes a pivotal support portion 25, an arm portion 26, and a movable contactor 27. The pivotal support portion 25 is rotatably supported by, for example, a bracket 28 attached to the contact attachment conductor portion 14 of the supply terminal 10A. The arm portion 26 extends obliquely upward from the pivotal support portion 25. The movable contactor 27 is bent from the tip of the arm portion 26 and extends downward toward the fixed electrode 21.

[0039] The movable electrode 22 rotates around the pivot portion 25 (counterclockwise in FIG. 2) and the movable contactor 27 is inserted between the pair of fixed contactors 24, thereby bringing the movable electrode 22 into a closed state in which it abuts against (electrically connected to) the fixed electrode 21. The movable electrode 22 also rotates around the pivot portion 25 (clockwise in FIG. 2) and the movable contactor 27 retreats upward from between the pair of fixed contactors 24, thereby bringing the movable electrode 22 into an open state in which it is separated from (electrically not connected to) the fixed electrode 21. Note that, in this embodiment, a form in which the movable contactor 27 is inserted between the pair of fixed contactors 24 is shown, but instead of this form, a form in which the fixed contactor 24 is inserted between the pair of movable contactors 27 may be used.

[0040] A drive link mechanism 23 that rotates the movable electrode 22 around the pivot support 25 is connected to the middle of the arm 26 of the movable electrode 22. The movable electrode 22 can be switched between the open and closed states by operating a manual operation arm (not shown) provided outside the case 50, which moves an operation mechanism (not shown) and drives the drive link mechanism 23 with the generated driving force. The operation mechanism (not shown) includes an elastic member, and at least the open state is maintained by the elastic force of this elastic member.

[0041] FIG. 6 is a cross-sectional view taken along the line II in FIG. 3. As shown in FIG. 3 and FIG. 6, the packing 70 seals the gap between the porcelain tube 40 and the terminal member 11. The packing 70 is made of an elastically deformable material such as a rubber-based material. The packing 70 is molded in advance into a predetermined shape as shown below. The packing 70 is interposed at least between the porcelain tube side engaging portion 48 and the terminal member side engaging portion 16, and restricts the rotation of the terminal member 11 in the terminal insertion hole 45. As shown in FIG. 3, FIG. 5, and FIG. 6, the packing 70 integrally includes a base portion 71, a protruding portion 72, a recessed portion 73, and an airtight portion 74. The packing 70 may be configured such that the base portion 71, the protruding portions 72 and 73, and the airtight portion 74 are separate components.

[0042] The base portion 71 is along the outer peripheral surface of the expanded diameter portion 15 of the terminal member 11. In this embodiment, the base portion 71 may be provided only in a portion of the circumferential direction along the outer peripheral surface of the expanded diameter portion 15. In this embodiment, the base portion 71 is provided in the terminal member 11 only around the base of the protrusion 16t so as to be along the outer peripheral surface of the expanded diameter portion 15. The base portion 71 may be formed in a cylindrical shape extending in the axial direction Da so as to cover the entire circumferential direction along the outer peripheral surface of the expanded diameter portion 15.

[0043] The protrusion 72 protrudes radially outward from the base portion 71. The protrusion 72 is inserted into the groove 48m of the porcelain tube 40. The outer peripheral surface of the protrusion 72 has a curved surface 72r that bulges outward in the radial direction. The recess 73 is formed on the inner peripheral surface 71f of the base portion 71 that faces the outer peripheral surface of the expanded diameter portion 15 in correspondence with the protrusion 72. The recess 73 is recessed radially outward from the inner peripheral surface 71f of the base portion 71. The protrusion 16t provided on the expanded diameter portion 15 is inserted into the recess 73. One or more protrusions 72 and recesses 73 are provided. In this embodiment, two protrusions 72 and recesses 73 are provided at equal intervals in the circumferential direction. The protrusions 72 and recesses 73 are provided so as to cover each protrusion 16t from both circumferential sides and from the radial outside.

[0044] FIG. 7 is a cross-sectional view showing the relationship between the diameter of the protrusion 72 of the packing 70 and the groove 48m of the porcelain tube 40. As shown in FIG. 7, the dimension of the protrusion 72 from the center of the terminal insertion hole 45 increases from the first side facing the first side Da1 to the second side facing the second side Da2 in the axial direction Da. That is, the radial thickness of the protrusion 72 gradually increases from the first side to the second side in the axial direction Da. The diameter dimension T1 of the first side Da1 in the axial direction Da of the packing 70 at the portion where the protrusion 72 is provided is smaller than the groove opening diameter dimension P, which is the inner diameter of the porcelain tube 40 at the portion where the groove 48m is provided. The diameter dimension T2 of the second side Da2 in the axial direction Da of the packing 70 at the portion where the protrusion 72 is provided is larger than the groove opening diameter dimension P.

[0045] As shown in FIG. 3 and FIG. 5, the airtight portion 74 is provided at the end of the first side Da1 in the axial direction Da of the packing 70. The airtight portion 74 is disk-shaped and formed along a surface perpendicular to the axial direction Da. The airtight portion 74 is provided along the inward surface 15s of the expanded diameter portion 15. As shown in FIG. 3, the airtight portion 74 is sandwiched between the outward surface 47f of the porcelain tube 40 and the inward surface 15s of the terminal member 11. The multiple base portions 71 are integrally provided on the outer periphery of the airtight portion 74. An insertion hole 74h into which the intermediate conductor portion 13 is inserted is formed in the center of the airtight portion 74. A cylindrical lip portion 76 rising toward the first side Da1 in the axial direction Da is integrally formed on the periphery of the insertion hole 74h. The cylindrical lip portion 76 is inserted in a compressed state into the gap between the terminal insertion hole 45 of the porcelain tube 40 and the outer circumferential surface of the intermediate conductor portion 13 of the terminal member 11 .

[0046] 5 and 7, when assembling the switch 100, such a packing 70 is attached in advance to, for example, the expanded diameter portion 15 of the terminal member 11. The packing 70 is in a state where the airtight portion 74 is abutted against the inward surface 15s of the expanded diameter portion 15 and the projections 16t are fitted into the recesses 73.

[0047] FIG. 8 is a cross-sectional view showing a state in which the convex portion 72 of the packing 70 attached to the terminal member 11 is being inserted into the groove 48m of the porcelain tube 40. As shown in FIG. 8, the terminal member 11 is inserted into the terminal insertion hole 45 of the porcelain tube 40 from the contact attachment conductor portion 14 side, and each convex portion 72 of the packing 70 is inserted into the groove 48m formed on the inner peripheral surface of the outer cylindrical portion 42 of the porcelain tube 40. At this time, as shown in FIG. 7, the diameter dimension T1 of the first side Da1 in the axial direction Da of the packing 70 at the portion where the convex portion 72 is provided is smaller than the groove opening diameter dimension P. Therefore, as shown in FIG. 8, the convex portion 72 of the packing 70 is easily inserted into the groove 48m. In addition, since the convex portion 72 has a curved surface 72r, the convex portion 72 is easily inserted into the groove 48m.

[0048] When the terminal member 11 is further pushed into the first side Da1 in the axial direction Da, the airtight portion 74 abuts against the outward surface 47f of the porcelain tube 40, as shown in FIG. 3. This allows the terminal member 11 to be easily and reliably positioned in the axial direction Da relative to the porcelain tube 40. In this state, the entire axial direction Da of the protrusion 72 is inserted into the groove 48m, as shown in FIG. 6. This prevents the terminal member 11 from rotating in the circumferential direction around the center of the terminal insertion hole 45 in the porcelain tube 40. The rotation restraining force of the terminal member 11 is increased by providing multiple sets of the groove 48m, the protrusion 16t, the protrusion 72, and the recess 73 that restrain the rotation. In addition, the force required to restrain the rotation is small in each set of the groove 48m, the protrusion 16t, the protrusion 72, and the recess 73.

[0049] In this state, as shown in FIG. 3, the diameter T2 of the second side Da2 in the axial direction Da of the packing 70 at the portion where the protrusion 72 is provided is larger than the groove opening diameter P, so that the protrusion 72 is in close contact with the inner peripheral surface of the groove 48m, and a stable anti-rotation performance can be exhibited within the dimensional tolerance of the porcelain tube 40. In addition, the airtight portion 74 is sandwiched between the inner surface 15s of the expanded diameter portion 15 and the outer surface 47f of the porcelain tube 40. This makes it possible to maintain airtightness between the terminal member 11 and the porcelain tube 40. In addition, after the airtight portion 74 abuts against the outer surface 47f of the porcelain tube 40, the nut member 49 is screwed into the male thread portion 17 of the terminal member 11 on the radially inner side of the inner cylindrical portion 41. As a result, the inner peripheral wall portion 43w of the terminal member 11 is sandwiched between the inward surface 15s of the terminal member 11 and the nut member 49, and the terminal member 11 is firmly fixed in a state in which it is positioned on the porcelain tube 40. Furthermore, by screwing the nut member 49 into the male thread portion 17 of the terminal member 11, as described above, the cylindrical lip portion 76 of the packing 70 is inserted in a compressed state into the gap between the terminal insertion hole 45 of the porcelain tube 40 and the outer peripheral surface of the intermediate conductor portion 13 of the terminal member 11.

[0050] Thus, according to the switch 100 and packing 70 of this embodiment, by providing the packing 70 between the porcelain tube side engaging portion 48 and the terminal member side engaging portion 16, it is possible to restrain the rotation of the terminal member 11 in the terminal insertion hole 45. Since the packing 70 is a molded body molded into a predetermined shape in advance, when assembling the switch 100, it is sufficient to sandwich the packing 70 between the porcelain tube 40 and the terminal member 11. Therefore, the workability of assembling the switch 100 can be improved.

[0051] In the above embodiment, the convex portion 72 of the packing 70 covers the radial outside and both circumferential sides of the protrusion 16t, but this is not limited to the above. For example, the packing 70 may be provided only on both circumferential sides of the protrusion 16t without covering the radial outside of the protrusion 16t, and may be sandwiched between the packing 70 and the groove 48m.

[0052] Although the embodiment has been described above, the present invention is not limited to the above description, and various modifications are possible within the scope of the present invention. One or more of the requirements described in the above embodiment may be omitted. The requirements described in the above embodiment may be combined as appropriate. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiment. Such modifications or improvements are also included in the technical scope of the present invention. In the above embodiment, the configuration of the opening / closing mechanism 20 housed in the case 50 is illustrated and described, but the present invention is not limited to this configuration, and a similar description is possible even if another opening / closing mechanism is used. [Explanation of symbols]

[0053] 11 Terminal member 11a...Proximal end 11b...Tip 12 Connection terminal 13. Intermediate conductor section 14...Contact mounting conductor section 15s...Inward facing 16 Terminal member side engagement portion 16t...protrusion 17... Male thread 20. Opening and closing mechanism 21...Fixed electrode 22... Movable electrode 40...Insulator tube 43w...Inner peripheral wall 45 Terminal insertion hole 47f...Outward facing surface 48....Porcelain tube side engagement part 48m...Groove 49 Nut member 50··Case 70...Packing 71 Base section 71f...Inner peripheral surface 72... Convex part 72r... Curved surface 73 Recess 74 Airtight part 100···Switch Da Axial direction Da1: First side Da2...Second side P...Groove opening diameter dimension T1, T2: Diameter dimensions

Claims

1. an opening / closing mechanism having a fixed electrode and a movable electrode that can come into contact with or be separated from the fixed electrode; A case that houses the opening and closing mechanism; a porcelain bushing held in the case and having a terminal insertion hole extending in an axial direction communicating between the inside and outside of the case; a terminal member that is inserted into the terminal insertion hole of the porcelain tube, has a base end that is disposed within the case and connected to the fixed electrode or the movable electrode, and has a tip end that is disposed outside the case and can be electrically connected to an external electric circuit; a porcelain tube side engagement portion formed on an inner peripheral surface of the terminal insertion hole; a terminal member side engaging portion formed on an outer peripheral surface of the terminal member; a packing that is elastically deformable, seals between the porcelain tube and the terminal member, and is interposed at least between the porcelain tube side engaging portion and the terminal member side engaging portion to restrict rotation of the terminal member in the terminal insertion hole, the porcelain bushing side engagement portion has a groove recessed radially outward of the terminal insertion hole and extending in the axial direction, the terminal member side engaging portion has a projection that projects radially outward from the outer circumferential surface, The packing is a base portion along the outer circumferential surface of the terminal member; a protrusion protruding radially outward from the base and inserted into the groove; a recess formed on the inner circumferential surface of the base portion corresponding to the protrusion, the recess into which the protrusion is inserted.

2. the protrusion has a curved surface that bulges outward in a radial direction, and a dimension from a center of the terminal insertion hole increases from a first side facing the inside of the case to a second side facing the outside of the case in the axial direction, a diameter dimension of the packing on the first side in the axial direction at a portion where the protrusion is provided is smaller than a groove opening diameter dimension of the groove, The switch according to claim 1 , wherein a diameter dimension of the packing on the second side in the axial direction at a portion where the protrusion is provided is larger than a diameter dimension of the groove opening.

3. an opening / closing mechanism having a fixed electrode and a movable electrode that can come into contact with or be separated from the fixed electrode; A case that houses the opening and closing mechanism; a porcelain bushing held in the case and having a terminal insertion hole extending in an axial direction communicating between the inside and outside of the case; a terminal member that is inserted into the terminal insertion hole of the porcelain tube, has a base end that is disposed within the case and connected to the fixed electrode or the movable electrode, and has a tip end that is disposed outside the case and can be electrically connected to an external electric circuit; a porcelain tube side engagement portion formed on an inner peripheral surface of the terminal insertion hole; a terminal member side engaging portion formed on an outer peripheral surface of the terminal member; a packing that is elastically deformable, seals between the porcelain tube and the terminal member, and is interposed at least between the porcelain tube side engaging portion and the terminal member side engaging portion to restrict rotation of the terminal member in the terminal insertion hole, the porcelain bushing has an outward surface facing outward from the case in the axial direction, the terminal member has an inward surface facing inward of the case in the axial direction and opposed to the outward surface, The packing has an airtight portion sandwiched between the outward surface of the porcelain tube and the inward surface of the terminal member.

4. The porcelain tube has an inner peripheral wall portion extending radially inward and the terminal insertion hole penetrating the inner peripheral wall portion in the axial direction, The terminal member has a male screw portion having a screw groove formed on an outer circumferential surface thereof, The switch according to claim 3 , further comprising a nut member that engages with the male thread portion of the terminal member inserted into the terminal insertion hole to sandwich the inner peripheral wall portion between the inward surface and the nut member.

5. The terminal member is A connection terminal portion connected to the external electric circuit; an intermediate conductor portion extending from the connection terminal portion through a terminal insertion hole of the porcelain tube to an inside of the case; 5. The switch according to claim 1, wherein the fixed electrode or the movable electrode is attached to a contact mounting conductor portion, and the contact mounting conductor portion is integrally formed with the fixed electrode or the movable electrode.

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