Switchgear

Abstract

To facilitate connection work of a pull bar to a striker drive shaft.SOLUTION: A switch includes a current-limiting fuse having a blown indicator bar that protrudes when blown, a pull bar that moves in the axial direction as the blown indicator bar protrudes, and a striker drive shaft that has a connecting portion that is connected to the end of the pull bar and that rotates as the pull bar moves in the axial direction, and the end of the pull bar is connected to the connecting portion by being engaged with the connecting portion when the rotation angle with respect to the connecting portion is within a predetermined movable angle range, and the rotation angle with respect to the connecting portion is outside the movable angle range. At this time, the switch becomes detachable from the connecting portion by releasing the locking with the connecting portion.SELECTED DRAWING: Figure 8

Description

[Technical field]

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

[0002] The following Patent Document 1 discloses a switch configured so that the operating force of a handle is transmitted to a plurality of drive devices via an opening / closing shaft and a pull bar, thereby enabling a plurality of drive devices to be driven simultaneously. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-47424 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, switches equipped with a striker mechanism are known, which are configured such that when a current-limiting fuse is blown, a blown indicator bar protrudes from the current-limiting fuse, and a pull bar moves in the axial direction as the blown indicator bar protrudes, thereby rotating a striker drive shaft connected to the pull bar.

[0005] However, conventional switches equipped with a striker mechanism have a configuration in which a pin is used to connect the pull bar to the striker drive shaft, making it difficult to connect the pull bar to the striker drive shaft. [Means for solving the problem]

[0006] A switchgear according to one embodiment includes a current-limiting fuse having a fusion indicator bar that protrudes when the fuse is blown, a pull bar that moves axially as the fusion indicator bar protrudes, and a striker drive shaft that has a connecting part connected to the end of the pull bar and rotates as the pull bar moves in the axial direction. When the rotation angle of the end of the pull bar relative to the connecting part is within a predetermined movable angle range, the end of the pull bar is engaged with the connecting part to connect it to the connecting part, and when the rotation angle of the end of the pull bar relative to the connecting part is outside the movable angle range, the engagement with the connecting part is released, making it detachable from the connecting part. Effect of the Invention

[0007] According to one embodiment, the operation of connecting the pull bar to the striker drive shaft can be easily performed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a switch according to an embodiment; [Diagram 2] 1 is a side view of a switch according to an embodiment; [Diagram 3] FIG. 1 is a diagram for explaining the configuration and operation of a striker mechanism included in a switch according to an embodiment; [Figure 4] FIG. 1 is a diagram for explaining the configuration and operation of a striker mechanism included in a switch according to an embodiment; [Diagram 5] FIG. 1 is a partially enlarged side view showing a connecting structure of a striker mechanism according to an embodiment; [Figure 6] AA cross-sectional view of the connecting structure shown in FIG. [Figure 7] FIG. 6 is a view taken along the arrow B of the connecting structure shown in FIG. 5 (however, the pull bar is omitted from the drawing); [Figure 8] FIG. 1 is a diagram for explaining a procedure of an assembly method for a connecting structure part of a striker mechanism according to an embodiment; [Figure 9] FIG. 13 is a diagram illustrating an example of a movable angle range of a pull bar in a striker mechanism according to an embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment will be described with reference to the drawings.

[0010] (Configuration of switch 100) Fig. 1 is a plan view of a switch 100 according to an embodiment. Fig. 2 is a side view of the switch 100 according to an embodiment. In the following description, for convenience, the Z-axis direction is the up-down direction, the Y-axis direction is the left-right direction, and the X-axis direction is the front-rear direction.

[0011] 1 and 2 is a high-voltage AC load switch that is installed in a high-voltage AC power supply system. The switch 100 is installed between a power supply and a load in a three-phase AC current path, and is capable of opening and closing the three-phase AC current path.

[0012] The switch 100 has a left side plate 103 (Y-axis negative side), a right side plate 104 (Y-axis positive side), and a base frame 105. The side plates 103 and 104 are connected by a flat base frame 105 that is elongated in the left-right direction (Y-axis direction). A flat operating handle 102 that is elongated in the front-rear direction (X-axis direction) is rotatably provided on the right side plate 104 (Y-axis positive side).

[0013] The switch 100 has three load switching units 110 corresponding to the three phases arranged side by side between a left side plate 103 (Y-axis negative side) and a right side plate 104 (Y-axis positive side) and on the upper side (Z-axis positive side) of a base frame 105. The three load switching units 110 are connected to each other by a striker mechanism 120.

[0014] Each of the three load switching units 110 has a current-limiting fuse 111, a power supply side terminal 112, a load side terminal 113, a movable contact 114, an arc-extinguishing chamber 115, and a support base .

[0015] Current-limiting fuse 111 has a cylindrical shape extending in the front-rear direction (X-axis direction). Current-limiting fuse 111 is fixed at a predetermined height to support stand 116 erected on base frame 105 in an inclined state with its rear end (end on the negative side of the X-axis) facing downward. Current-limiting fuse 111 is configured to melt when an overload current or short-circuit current flows.

[0016] The load side terminal 113 is provided to protrude rearward (in the negative direction of the X-axis) from the rear end (the end on the negative side of the X-axis) of the current-limiting fuse 111. The load side terminal 113 is electrically connected to the rear end (the end on the negative side of the X-axis) of the current-limiting fuse 111.

[0017] The movable contactor 114 is rotatably provided below (on the Z-axis negative side) the front end portion (on the X-axis positive side) of the current-limiting fuse 111. The movable contactor 114 is electrically connected to the front end portion of the current-limiting fuse 111. The movable contactor 114 has a shape that is bent so as to be convex upward (in the Z-axis positive direction). The tip portion 114A of the movable contactor 114 is disposed above the power supply terminal 112 in a position approximately perpendicular to the power supply terminal 112. The movable contactor 114 is connected to the operating handle 102, and rotates in response to the operation of the operating handle 102, so that the tip portion 114A can be brought into contact with and separated from the power supply terminal 112.

[0018] When the operating handle 102 is operated, the tip 114A of the movable contact 114 of each of the three load switching units 110 comes into contact with the power supply side terminal 112, thereby establishing a state of conduction between the load side terminal 113 and the power supply side terminal 112 via the current-limiting fuse 111 and the movable contact 114, i.e., the load switching unit 110 is in a conducting state.

[0019] On the other hand, in each of the three load switching units 110, when the operating handle 102 is operated, the tip 114A of the movable contact 114 moves away from the power supply side terminal 112, thereby causing a non-conductive state between the load side terminal 113 and the power supply side terminal 112, i.e., the load switching unit 110 is in an open state.

[0020] The contact point between the tip 114A of the movable contactor 114 and the power supply side terminal 112 is provided in the arc-extinguishing chamber 115. As a result, an arc generated at the contact point between the tip 114A of the movable contactor 114 and the power supply side terminal 112 is extinguished in the arc-extinguishing chamber 115.

[0021] (Configuration and Operation of Striker Mechanism 120) 3 and 4 are diagrams for explaining the configuration and operation of the striker mechanism 120 included in the switch 100 according to one embodiment. Fig. 3 shows the state of the striker mechanism 120 when the load switch unit 110 is energized. Fig. 4 shows the state of the striker mechanism 120 when the load switch unit 110 is opened.

[0022] As shown in FIGS. 3 and 4, the striker mechanism 120 includes a blown indicator lever 121, a pull bar 122, a striker drive shaft 123, and a breaking latch 125.

[0023] The blown fuse display lever 121 is rotatably provided at a position facing the front end face (X-axis positive side) of the current-limiting fuse 111.

[0024] The pull bar 122 is a rod-shaped member that extends linearly in the vertical direction (Z-axis direction) and is connected at its upper end 122A (the end on the Z-axis positive side) to the blown indication lever 121. This allows the pull bar 122 to move in the vertical direction (Z-axis direction) as the blown indication lever 121 rotates.

[0025] The striker drive shaft 123 is a rod-shaped member that extends linearly in the left-right direction (Y-axis direction). The striker drive shaft 123 is rotatably supported by the base frame 105. The striker drive shaft 123 has a connecting portion 124, and a lower end portion 122B (an end portion on the Z-axis negative side) of the pull bar 122 is connected to the connecting portion 124. This allows the striker drive shaft 123 to rotate in accordance with the movement of the pull bar 122 in the up-down direction (Z-axis direction).

[0026] The cutoff latch 125 is rotatably provided on the right side (Y-axis positive side) of the side plate 104. The cutoff latch 125 engages with the operating handle 102 when the operating handle 102 is in the closed state, thereby maintaining the operating handle 102 in the closed state.

[0027] In the striker mechanism 120 configured as described above, when the current-limiting fuse 111 melts due to an overload current or a short-circuit current, as shown in FIG. 4, the melting indicator bar 111A protrudes forward (in the positive direction of the X-axis) from the front end face (positive side of the X-axis) of the current-limiting fuse 111 (arrow A in the figure).

[0028] As a result, the blown indication lever 121 is urged forward (X-axis positive direction) by the blown indication rod 111A, and the blown indication lever 121 rotates forward (X-axis positive direction) (arrow B in the figure). At the same time, the pull bar 122 connected to the blown indication lever 121 moves downward (Z-axis negative direction) (arrow C in the figure).

[0029] As the pull bar 122 moves downward (in the negative direction of the Z axis), the striker drive shaft 123 rotates (arrow D in the figure), and the striker drive shaft 123 presses down the breaking latch 125 (arrow E in the figure).

[0030] This releases the operating handle 102 from the breaking latch 125, and the operating handle 102 rotates in the opening direction due to the biasing force from the spring, and the movable contacts 114 of the three load opening / closing units 110 connected to the operating handle 102 move away from the power supply side terminals 112. As a result, each of the three load opening / closing units 110 is in the open state.

[0031] The striker drive shaft 123 is provided with three connecting portions 124, and the pull bars 122 of the three load opening and closing units 110 are connected to the three connecting portions 124, respectively. As a result, when the pull bars 122 of any of the three load opening and closing units 110 move downward (in the negative direction of the Z axis), the striker drive shaft 123 rotates to push down the breaking latch 125.

[0032] Therefore, in the switch 100 according to one embodiment, when the current-limiting fuse 111 of any of the three load switching units 110 melts due to an overload current or a short-circuit current, the operating handle 102 is opened via the striker mechanism 120, so that all of the three load switching units 110 can be immediately opened. This makes it possible for the switch 100 according to one embodiment to prevent an open-phase operation.

[0033] (Configuration of connecting structure of striker mechanism 120) Hereinafter, with reference to Figs. 5 to 7, a detailed description will be given of the connecting structure of the striker mechanism 120 according to one embodiment (the connecting structure between the lower end 122B of the pull bar 122 and the connecting portion 124 of the striker drive shaft 123).

[0034] Fig. 5 is a partially enlarged side view showing a connecting structure of the striker mechanism 120 according to one embodiment. Fig. 6 is a cross-sectional view taken along line AA of the connecting structure shown in Fig. 5. Fig. 7 is a view seen from the arrow B of the connecting structure shown in Fig. 5 (however, the pull bar 122 is not shown).

[0035] As shown in FIG. 5, a lower end portion 122B of the pull bar 122 is rotatably connected to a connection portion 124 of a striker drive shaft 123.

[0036] 5 to 7, the connecting portion 124 is formed in a box shape having a right side wall portion 124A, a left side wall portion 124B, an upper wall portion 124C, and a lower wall portion 124D. In the connecting portion 124, an axis portion 124E extending in the left-right direction (Y-axis direction) is provided between the right side wall portion 124A and the left side wall portion 124B. As shown in FIG. 5, the tip portion (the end portion on the X-axis positive side) of the upper wall portion 124C has a curved shape that follows the circumference of a circle centered on the connecting portion 124.

[0037] A semicircular rotating part 122C is provided at the lower end 122B of the pull bar 122. The rotating part 122C is rotatably disposed inside the connecting part 124. A bearing part 122D cut out in a semicircular shape is formed at the lower end surface 122Ca of the rotating part 122C. The rotating part 122C is rotatably disposed inside the connecting part 124 around the shaft part 124E as the center of rotation with the bearing part 122D pressed against the shaft part 124E. The rotating part 122C is prevented from falling off the connecting part 124 by abutting the upper wall part 124C at the outer circumferential surface 122Cb as long as the rotation angle of the pull bar 122 relative to the connecting part 124 is within a predetermined movable angle range. The tip of the upper wall portion 124C has a curved surface that conforms to the outer circumferential surface 122Cb of the rotating portion 122C, and the outer circumferential surface 122Cb of the rotating portion 122C slides along the tip as the rotating portion 122C rotates.

[0038] In addition, the connecting portion 124 has an opening 124F, which is a portion that does not have the upper wall portion 124C and the lower wall portion 124D, formed in the predetermined attachment / detachment direction D1 as viewed from the shaft portion 124E. That is, the opening 124F is provided between the tip end (the end on the X-axis positive side) of the upper wall portion 124C and the tip end (the end on the X-axis positive side) of the lower wall portion 124D. As a result, the connecting portion 124 is configured such that the semicircular rotating portion 122C provided at the lower end portion 122B of the pull bar 122 can be inserted into the connecting portion 124 through the opening 124F by setting the rotation angle of the pull bar 122 relative to the connecting portion 124 outside the predetermined movable angle range (that is, by making the axial direction of the pull bar 122 coincide with the predetermined attachment / detachment direction D1).

[0039] 6 and 7, a slit portion 124G having a certain width is formed in the center in the left-right direction (Y-axis direction) of the upper wall portion 124C of the connecting portion 124. By inserting the lower end portion 122B of the pull bar 122 into the slit portion 124G of the connecting portion 124 (see FIG. 6), the pull bar 122 can be rotated within a predetermined movable angle range without interfering with the upper wall portion 124C.

[0040] The striker mechanism 120 according to one embodiment has the above-mentioned configuration, so that when the rotation angle relative to the connecting part 124 is within a predetermined movable angle range, the lower end 122B of the pull bar 122 is engaged with the connecting part 124 and thereby connected to the connecting part 124. Moreover, when the rotation angle relative to the connecting part 124 is outside the predetermined movable angle range, the lower end 122B of the pull bar 122 is released from the engagement with the connecting part 124 and becomes detachable from the connecting part 124.

[0041] Specifically, the connecting part 124 has a shaft part 124E. Furthermore, the lower end part 122B of the pull bar 122 has a semicircular rotating part 122C. The rotating part 122C has a bearing part 122D having a shape cut out in a shape corresponding to the shaft part 124E, and is connected to the connecting part 124 so as to be rotatable about the shaft part 124E with the bearing part 122D pressed against the shaft part 124E.

[0042] The connecting portion 124 has an upper wall portion 124C formed along the outer circumferential surface of the rotating portion 122C except in a predetermined attachment / detachment direction D1, and when the rotation angle relative to the connecting portion 124 is within a predetermined movable angle range, the outer circumferential surface 122Cb of the rotating portion 122C engages with the upper wall portion 124C, thereby connecting the lower end portion 122B of the pull bar 122 to the connecting portion 124, and when the rotation angle relative to the connecting portion 124 is outside the predetermined movable angle range, the engagement between the outer circumferential surface 122Cb of the rotating portion 122C and the upper wall portion 124C is released, thereby making the lower end portion 122B attachable to and detachable from the connecting portion 124 in the predetermined attachment / detachment direction D1.

[0043] (Procedure for assembling the connecting structure of the striker mechanism 120) FIG. 8 is a diagram for explaining the procedure of a method for assembling the connecting structure of the striker mechanism 120 according to one embodiment.

[0044] First, as shown in FIG. 8(a), with the axial direction of the pull bar 122 aligned with a predetermined attachment / detachment direction D1, the rotating portion 122C provided at the lower end 122B of the pull bar 122 is inserted into the connecting portion 124 through the opening 124F of the connecting portion 124, and the bearing portion 122D provided on the rotating portion 122C is pressed against the shaft portion 124E provided in the connecting portion 124.

[0045] Next, as shown in Fig. 8(b), the pull bar 122 is rotated upward around the shaft portion 124E as the center of rotation. As a result, as shown in Fig. 8(c), the rotation angle of the pull bar 122 with respect to the connecting portion 124 comes within a predetermined movable angle range, and the outer circumferential surface 122Cb of the rotating portion 122C is locked to the upper wall portion 124C, preventing the rotating portion 122C from falling off the connecting portion 124. Thus, the operation of connecting the pull bar 122 to the connecting portion 124 is completed.

[0046] As described above, the switch 100 according to one embodiment can complete the operation of connecting the pull bar 122 to the connecting portion 124 simply by inserting the rotating portion 122C of the pull bar 122 into the connecting portion 124 and rotating the pull bar 122 without using a pin or the like. Therefore, the switch 100 according to one embodiment can easily perform the operation of connecting the pull bar 122 to the striker drive shaft 123.

[0047] (An example of the movable angle range of the pull bar 122) FIG. 9 is a diagram showing an example of a movable angle range of a pull bar 122 in a striker mechanism 120 according to an embodiment.

[0048] As shown in FIG. 9, the pull bar 122 is connected to the shaft portion 124E, and thereby becomes rotatable within a predetermined movable angle range around the shaft portion 124E as the center of rotation.

[0049] As shown in FIG. 9(b), the movable angle range of the pull bar 122 in the first direction (counterclockwise when viewed from the right) is the range up to when the lower end portion 122B of the pull bar 122 abuts against the inside of the slit portion 124G formed in the upper wall portion 124C.

[0050] Also, as shown in FIG. 9(a), the movable angle range of the pull bar 122 in the second direction (clockwise direction when viewed from the right) is not particularly limited, but is essentially the movable angle range until the engagement between the upper wall portion 124C and the rotating portion 122C is released (i.e., until the rotating portion 122C becomes detachable from the opening 124F of the connecting portion 124).

[0051] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0052] 100 Switch 102 Operating handle 103 Side Panel 104 Side Panel 105 Base Frame 110 Load Switching Unit 111 Current-limiting fuse 111A Fuse indicator 112 Power side terminal 113 Load side terminal 114 Movable Contact 114A Tip 115 Arc Extinguishing Room 116 Support stand 120 Striker mechanism 121 Fuse indicator lever 122 Pulver 122A Upper end 122B Lower end 122C Rotating section 122Ca bottom end surface 122Cb outer surface 122D bearing part 123 Striker drive shaft 124 Connection section 124A Right side wall 124B Left side wall 124C Upper wall 124D Lower wall section 124E Shaft 124F opening 124G Slit section 125 Breaking Latch D1 Attachment / detachment direction

Claims

1. a current-limiting fuse having a blown indicator that protrudes when the fuse is blown; A pull bar that moves in an axial direction in accordance with the projection of the fusion indicator rod; a striker drive shaft having a connecting portion connected to an end portion of the pull bar and rotating in association with the movement of the pull bar in the axial direction; Equipped with The end of the pull bar is When the rotation angle with respect to the connecting portion is within a predetermined movable angle range, the connecting portion is engaged with the connecting portion, and thereby the connecting portion is connected to the connecting portion; When the rotation angle relative to the connecting portion is outside the movable angle range, the lock with the connecting portion is released, thereby making the connecting portion detachable. A switch characterized by:

2. The connecting portion is A shaft portion is provided. The end of the pull bar is A semicircular rotating portion is provided. The rotating part is The bearing portion has a shape that is cut out in a shape that corresponds to the shaft portion, and is arranged to be rotatable with respect to the connecting portion with the shaft portion as a rotation center when the bearing portion is pressed against the shaft portion.

2. The switch according to claim 1 .

3. The connecting portion is a wall portion formed along an outer circumferential surface of the rotating portion except in a predetermined attachment / detachment direction; The end of the pull bar is When a rotation angle relative to the connecting portion is within the movable angle range, an outer circumferential surface of the rotating portion is engaged with the wall portion, thereby connecting the rotating portion to the connecting portion, When the rotation angle with respect to the connecting portion is outside the movable angle range, the engagement between the outer circumferential surface of the rotating portion and the wall portion is released, thereby making the rotating portion detachable from the connecting portion in the predetermined attachment / detachment direction.

3. The switch according to claim 2.

Images