JP7434253B2 - Bottom electrode with cylindrical cutout - Google Patents

Description

This specification discloses techniques for lower electrodes used with cylindrical cutouts.

Patent Document 1 discloses a technique related to cylindrical cutouts. The cylindrical cutout is attached to an attached part (for example, a utility pole) using a mounting bracket such as a cross arm. In a cylindrical cutout, gas is generated from the fuse inside the power fuse (fuse tube) by interrupting the large current in the event of an accident. Gas generated from the fuse is discharged from inside the cylindrical cutout to the outside of the cylindrical cutout. That is, by cutting off the large current at the time of an accident, released gas is generated. When the gas is released, an upward thrust is applied to the cylindrical cutout (a force that moves the cylindrical cutout upward). The upward thrust exerted on the cylindrical cutout is lost once the high current has been interrupted (when the emission gases have ceased to be generated). In Patent Document 1, by fixing the cylindrical cutout to the attached part using a mounting bracket, the mounting bracket deforms when the cylindrical cutout moves upward, reducing the energy of the thrust force applied to the cylindrical cutout. ing. As a result, the speed at which the cylindrical cutout moves from above to below (the speed at which the cylindrical cutout swings down) is reduced.

Publication No. 57-029491

As mentioned above, the cylindrical cutout of Patent Document 1 reduces the thrust energy applied to the cylindrical cutout by fixing the cylindrical cutout to the attached part using a mounting bracket, and Reduces downward movement speed. However, once the downward movement of the cylindrical cutout is completed, the cylindrical cutout is then moved upward due to the elastic force of the fitting. That is, the cylindrical cutout performs an oscillating movement (positional variation) up and down due to the generation and stop of emitted gas.

From the time when the cylindrical cutout's upward to downward movement speed begins to decrease until the time when the cylindrical cutout stops moving downward and begins to move upward, and the upward movement speed increases. , a large force is applied to the power fuse (fuse tube). Specifically, a force is applied to the power fuse that causes the power fuse (lower electrode portion of the power fuse) to separate from the lower electrode of the cylindrical cutout. When a detachment force is applied to the power fuse, and a force that moves the insulating tube downward due to the biasing force of the spring attached to the power fuse (fuse tube) exceeds the clamping force of the lower electrode against the power fuse, It may happen that the power fuse becomes dislodged from the bottom electrode. Therefore, there is a need for a technique that prevents the power fuse (fuse tube) from coming off the lower electrode of the cylindrical cutout when the cylindrical cutout performs vertical oscillating motion. An object of the present specification is to provide a technique for preventing a power fuse from coming off a lower electrode of a cylindrical cutout as the cylindrical cutout is operated.

The lower electrode disclosed herein is connected to both the high-voltage equipment wiring and the power fuse in a cylindrical cutout that is connected to the power distribution line and the high-voltage equipment wiring. The lower electrode may include a pedestal portion fixed to the cylindrical cutout body, a contact portion affixed to the pedestal portion, and a locking mechanism attached to the pedestal portion. The contact portion may contact the outer peripheral surface of the lower electrode portion of the power fuse. The locking mechanism also holds the lower electrode portion of the power fuse when a disengagement force is applied to the power fuse due to positional change of the cylindrical cutout body, causing the power fuse to move outside the cylindrical cutout body. good.

Figure 3 shows a cross-sectional view of a cylindrical cutout. The perspective view of the lower electrode of 1st Example is shown. A partial sectional view of the lower electrode of the first example is shown. The perspective view of the component (annular member) of the locking mechanism used in the lower electrode of 1st Example is shown. 5 is a cross-sectional view of a state in which a spring member is attached to the annular member shown in FIG. 4. FIG. 5 is a cross-sectional view of a state in which a regulating member is attached to the annular member shown in FIG. 4. FIG. A cross-sectional view for explaining the operation of the locking mechanism (annular member) when the cylindrical cutout moves up and down in the first embodiment is shown. A sectional view for explaining the relationship between the contact portion and the locking mechanism when the cylindrical cutout moves up and down in the first embodiment. A cross-sectional view for explaining the positional relationship between the annular member and the pedestal part is shown. The perspective view of the lower electrode of 2nd Example is shown. The top view of the component (annular member) of the locking mechanism used in the lower electrode of 2nd Example is shown. A partial sectional view of a locking mechanism used in the lower electrode of the second example is shown. A sectional view for explaining the relationship between the contact portion and the locking mechanism when the cylindrical cutout moves up and down in the second embodiment. The top view of the component (annular member) of the locking mechanism used in the lower electrode of 3rd Example is shown. A sectional view for explaining the relationship between the contact portion and the locking mechanism when the cylindrical cutout moves up and down in the third embodiment.

The lower electrode disclosed herein connects to both the high voltage equipment side wiring and the power fuse at a cylindrical cutout that connects to the power distribution line and the high voltage equipment side wiring. The lower electrode may be fixed to the cylindrical cutout body within the cylindrical cutout body. The lower electrode may include a pedestal portion fixed to the cylindrical cutout body, a contact portion affixed to the pedestal portion, and a locking mechanism attached to the pedestal portion. The lower electrode may be placed inside the cylindrical cutout body by securing the pedestal to the cylindrical cutout body, with the contact portion and locking mechanism attached to the pedestal. The contact portion is made of metal and may contact the outer peripheral surface of the lower electrode portion of the power fuse. Further, the contact portion may sandwich the outer circumferential surface of the power fuse (the outer circumferential surface of the lower electrode portion). The locking mechanism may hold the lower electrode portion of the power fuse when a disengagement force is applied to the power fuse that moves the power fuse to the outside of the cylindrical cutout body due to a positional change of the cylindrical cutout body. In other words, the locking mechanism prevents the power fuse from coming off from the lower electrode due to the inertial force of the power fuse when gas is generated in the cylindrical cutout body and the cylindrical cutout body performs vibrational movement in the vertical direction. It's fine. This lower electrode can prevent the power fuse from being discharged outside the cylindrical cutout body by preventing the power fuse from coming off the lower electrode.

The contact portion provided on the lower electrode may have a structure that deforms in the radial direction when the power fuse is inserted into and removed from the cylindrical cutout body. This makes it possible to easily attach and detach the power fuse when inserting and extracting the power fuse into and out of the cylindrical cutout body. Further, the locking mechanism may restrict radial deformation of the contact portion when a detachment force is applied to the power fuse. By restricting radial deformation of the contact portion, the power fuse continues to be held between the contact portions, and the power fuse can be prevented from coming off from the lower electrode.

The locking mechanism does not make contact with the contact part when no detachment force is applied to the power fuse, and makes contact with the contact part when a detachment force is applied to the power fuse to prevent deformation of the contact part. Components may be provided. By providing such a regulating member, the power fuse can be reliably and easily installed and removed, and also prevents the power fuse from coming off from the lower electrode when a detachment force is applied to the power fuse. can do.

In the lower electrode disclosed in this specification, a plurality of contact portions may be provided in the circumferential direction of the lower electrode. In this case, the contact portions may be provided at equal intervals in the circumferential direction of the lower electrode (equal angle positions with respect to the center of the lower electrode). This allows the power fuse to be held more securely. Further, the locking mechanism includes a ring-shaped annular member, and regulating members may be provided at a plurality of locations in the circumferential direction of the annular member. The regulating member may be provided at a position corresponding to each contact portion (for each contact portion), or may be provided at a position corresponding to some of the plurality of contact portions. That is, among the plurality of contact parts, there may be a contact part that does not come into contact with the regulating member when a detachment force is applied to the power fuse. However, preferably, a regulating member is provided at a position corresponding to each contact part (for each contact part), so that deformation of all the contact parts is regulated when a detachment force is applied to the power fuse.

The annular member may be attached to the base via a spring member. When the cylindrical cutout is stationary and when the cylindrical cutout is moving up and down (especially when changing from a downwardly moving state to an upwardly moving state), the annular member in the axial direction of the pedestal part The position of the (regulating member) can be changed. It is possible to reliably prevent the contact part from contacting the regulating member when the cylindrical cutout is stationary, and also to ensure that the contact part contacts the regulating member when the cylindrical cutout is moving up and down. be able to.

The regulating member may be provided on the annular member so as to protrude from the surface of the annular member at a position corresponding to the contact portion. Thereby, the contact portion can be reliably brought into contact with the regulating member. For example, even if the axial position of the annular member deviates from the designed position due to deterioration of the spring member, contact may occur when the cylindrical cutout changes from moving downward to moving upward. The contact portion contacts the regulating member, and deformation of the contact portion can be restricted.

The annular member may be provided with a positioning member that positions the annular member with respect to the pedestal portion against the biasing force of the spring member. Thereby, when the cylindrical cutout is stationary, the axial position of the annular member is determined, and the contact portion can be reliably prevented from coming into contact with the regulating member.

A regulating member separate from the annular member may be attached to the annular member. Since the materials, sizes, etc. of the annular member and the regulating member can be selected individually, the degree of freedom in designing the locking mechanism increases.

A notch may be provided on the outer peripheral surface of the pedestal. Furthermore, a protrusion may be provided in a part of the circumferential direction of the annular member, protruding outward in the radial direction and capable of contacting the notch. It is possible to prevent the annular member from rotating with respect to the pedestal. Further, by using the notch and the protrusion, when the annular member moves up and down, the annular member can be moved smoothly.

(cylindrical cutout)
Referring to FIG. 1, a cylindrical cutout 100 will be schematically explained. Cylindrical cutouts 100 are provided on power distribution lines and are used to protect high voltage equipment such as transformers. The cylindrical cutout 100 includes a main insulator (cylindrical cutout main body) 8 made of porcelain, an upper electrode 4 connected to the power distribution line side, a lower electrode 10 connected to the equipment side, and the upper electrode 4 and the lower electrode 10. The fuse tube 6 is provided with a high-pressure blowout fuse connected thereto. The fuse tube 6 is an example of a power fuse. The upper electrode 4 is connected to the lead wire 2 inside the upper mold cone 3. The leader line 2 is connected to a power distribution line. The lower electrode 10 is connected to the lead wire 12 of the lower mold cone 13.

The cylindrical cutout 100 is attached to, for example, the upper side of a utility pole (not shown) using a mounting bracket 14. The fuse cylinder 6 is inserted into or removed from the main insulator 8 from below. In the cylindrical cutout 100, when a large current flows through the electrical circuit, the high-pressure fuse 9 provided in the fuse tube 6 blows, and gas is generated from the high-pressure fuse 9. The gas generated by the high-pressure blowing fuse 9 moves from the lower part of the main insulator 8 to the outside of the main insulator 8 as released gas, as shown by an arrow 15 . When the released gas moves outside the main insulator 8, a force (thrust) is applied to the cylindrical cutout 100 to move it in the direction of the arrow 17 (upward), and the cylindrical cutout 100 moves upward while the mounting bracket 14 is deformed. . In the cylindrical cutout 100, by allowing the cylindrical cutout 100 to move upward due to the generation of released gas, the impact applied from the main body insulator 8 to the fuse tube 6 (or from the fuse tube 6 to the main body insulator 8) is reduced. force can be reduced.

When the upward movement of the cylindrical cutout 100 is completed, the reaction of the upward movement (more precisely, the gravity applied to the cylindrical cutout 100 and the elastic force of the mounting bracket 14) causes the cylindrical cutout 100 to move in the direction of the arrow 18 ( A force is applied to move the object (downward). As a result, the cylindrical cutout 100 moves downward from the state shown in FIG. 1 (the state in which no released gas is generated). Further, when the downward movement of the cylindrical cutout 100 is completed, the cylindrical cutout 100 moves upward again (in the direction of the arrow 17) due to the reaction of the downward movement (the elastic force of the mounting bracket 14). Thus, in the cylindrical cutout 100, when the released gas is generated, the cylindrical cutout 100 performs an oscillating movement up and down.

When the cylindrical cutout 100 moves downward (in the direction of arrow 18), the fuse tube 6 disposed within the cylindrical cutout 100 also moves downward at the same time, and an inertial force is generated in the fuse tube 6 that causes it to continue moving downward. Therefore, even if the cylindrical cutout 100 stops moving downward, the fuse tube 6 tends to continue moving downward. Alternatively, even if the speed of downward movement of the cylindrical cutout 100 is reduced due to the elastic force of the fitting 14, the fuse barrel 6 attempts to maintain the speed of downward movement. The inertial force of the fuse tube 6 generates a force (separation force) that causes the fuse tube 6 to disengage from the lower electrode 10 . In particular, from the point at which the upward to downward movement speed of the cylindrical cutout 100 begins to decrease, the downward movement of the cylindrical cutout 100 ends and changes to upward movement, and the upward movement speed increases. Up to this point, the fuse tube 6 is subjected to a detachment force (an engagement with the lower electrode 10) that causes the fuse tube 6 (the lower electrode portion 11 of the fuse tube 6 separation force) is applied to remove the In particular, when the cylindrical cutout 100 is at its lowest position (the position where downward movement ends and changes to upward movement), the detachment force is maximum.

In the conventional cylindrical cutout, even when the above-mentioned detachment force becomes maximum, it does not exceed the force (clamping force) with which the lower electrode 10 clamps the lower electrode portion 11 of the fuse cylinder 9. Therefore, even if the cylindrical cutout vibrates up and down, the fuse tube 9 will not come off the lower electrode 10. However, in the conventional cylindrical cutout, if a force (descending force) that moves the insulating tube 19 downward due to the biasing force of the spring 16 is accidentally applied at the timing when the above-mentioned maximum detachment force occurs, the fuse tube 6 There is a possibility that the force of separation from the lower electrode 10 (separation force + descending force) exceeds the clamping force of the lower electrode 10 with respect to the fuse tube 9 . As a result, the fuse cylinder 6 comes off from the lower electrode 10. Although details will be described later, the cylindrical cutout 100 is provided with a locking mechanism that prevents the fuse cylinder 6 from coming off the lower electrode 10 when the vibrational movement of the cylindrical cutout 100 changes from downward movement to upward movement. . Therefore, even if the lowering force of the insulating tube 19 is accidentally applied at the timing when the maximum detachment force is generated in the fuse tube 9, the fuse tube 6 can be prevented from coming off from the lower electrode 10. Note that the locking mechanism is provided on the lower electrode 10.

(Lower electrode: 1st example)
The lower electrode 10 will be explained with reference to FIGS. 2 to 9. As shown in FIG. 2, the lower electrode 10 includes a cylindrical pedestal part 60, an electrode part 20 fixed to the pedestal part 60, and a locking mechanism 40 attached to the pedestal part 60 within the pedestal part 60. We are prepared. The pedestal portion 60 is fixed within the main body insulator 8 (see also FIG. 1). The electrode section 20 is fixed to one end surface (hereinafter referred to as the top surface) of the pedestal section 60. The electrode section 20 is fitted into the upper surface of the pedestal section 60. A notch 62 is provided on the outer peripheral surface of the pedestal 60. In the lower electrode 10, two notches 62 are provided at symmetrical positions with respect to the axis (center axis) of the pedestal 60. Each notch 62 extends along the axis of the pedestal 60 from the other end surface (hereinafter referred to as a lower surface) of the pedestal 60 to an axially intermediate portion of the pedestal 60 . A truncated conical guide portion 64 is provided on the inner surface of the pedestal portion 60 (see FIG. 7). The guide portion 64 is provided on a part of the inner surface (lower side) of the pedestal portion 60. The guide portion 64 guides the tip of the upper electrode portion of the fuse tube 6 to the center of the lower electrode 10 when the fuse tube 6 is inserted from below the cylindrical cutout 100 . By providing the guide portion 64, a stepped portion 63 is formed on the inner surface of the pedestal portion 60.

The electrode section 20 includes a fixing section 22 fixed to the pedestal section 60 and a contact section 24 fixed to the fixing section 22 with a rivet 23. The contact portion 24 can be considered to be fixed to the pedestal portion 60 via the fixing portion 22. In the lower electrode 10, two contact parts 24 are fixed to a fixed part 22. Each contact portion 24 is provided at a symmetrical position with respect to the axis of the pedestal portion 60. Further, each contact portion 24 is located in a portion in the circumferential direction of the pedestal portion 60 where the above-mentioned notch portion 62 is not provided. The contact portion 24 comes into contact with the outer circumferential surface of the fuse tube 6 (the outer circumferential surface of the lower electrode portion 11 provided in the fuse tube 6) when the fuse tube 6 is inserted into the main insulator 8. More specifically, the contact portion 24 elastically deforms outward in the radial direction when the fuse tube 6 is inserted into the main insulator 8, and clamps the fuse tube 6 by its elastic force. The fixing portion 22 is provided with a threaded portion 22a. The threaded portion 22a is located above the notch 62 described above. A terminal portion 12b provided at the tip of the lead wire 12a of the leader wire 12 is screwed to the threaded portion 22a (see also FIG. 1).

Referring to FIG. 3, the form of the electrode section 20 will be described in detail. The fixing part 22 is ring-shaped and has a through hole 28 in the center. One end of the contact portion 24 is fixed to the back surface of the fixed portion 22 with a rivet 23. The intermediate portion of the contact portion 24 protrudes from the surface of the fixing portion 22 through the through hole 28, is bent approximately 180 degrees, and extends again to the back side of the fixing portion 22 (see also FIG. 2). A locking portion 25 is provided at the other end of each contact portion 24 . The locking portion 25 is formed by bending the fixing portion 22 inward in the radial direction in an arc shape. The locking portion 25 contacts the lower electrode portion 11 of the fuse tube 6 and holds the fuse tube 6 (lower electrode portion 11) on the lower electrode 10. An inclined portion 27 and a tip portion 26 are formed on the other end side of the locking portion 25 . The inclined portion 27 is formed by being bent so as to move upward in the lower electrode 10 and toward the inside in the radial direction of the fixing portion 22 . Since the inclined portion 27 is inclined inwardly and upwardly, the lower electrode portion 11 of the fuse cylinder 6 can be guided to the center of the lower electrode 10. The tip portion 26 is formed by being bent toward the outside in the radial direction of the fixing portion 22 . When the electrode part 20 is fixed (fitted) to the pedestal part 60, the tip part 26, the locking part 25, and the inclined part 27 are located inside the pedestal part 60 (see also FIG. 2).

The lock mechanism 40 will be explained with reference to FIGS. 4 to 6. The locking mechanism 40 includes a ring-shaped annular member 42, a spring member 54, and a regulating member 50. First, the annular member 42 will be explained with reference to FIG. The annular member 42 is a ring-shaped plate, and a plurality of through holes (first through hole 48a, second through hole 48b) passing through the front and back surfaces are formed in the circumferential direction. Although details will be described later, the first through hole 48a is for attaching the regulating member 50, and the second through hole 48b is for attaching the spring member 54. The inner circumferential surface 45 of the annular member 42 is provided with an enlarged diameter portion 46 whose inner diameter is larger than other portions. In the annular member 42, two enlarged diameter portions 46 are provided at symmetrical positions with respect to the axis of the annular member 42. In the circumferential direction of the annular member 42, two first through holes 48a are provided in each portion where the enlarged diameter portion 46 is formed. That is, the annular member 42 includes four first through holes 48a. Further, in the circumferential direction of the annular member 42, two second through holes 48b are provided in each portion where the enlarged diameter portion 46 is not provided (the portion between the two enlarged diameter portions 46). The annular member 42 includes four second through holes 48b.

Furthermore, a positioning portion 44 that projects radially outward is provided on the outer peripheral surface of the annular member 42 . In the annular member 42, four positioning portions 44 are provided, two each at two locations in the circumferential direction of the annular member 42. The position where the alignment part 44 is provided is symmetrical with respect to the axis of the annular member 42. At each location in the circumferential direction of the annular member 42, the two positioning portions 44 are provided with a gap between them, and a recess 49 is formed between the two positioning portions 49 facing inward in the radial direction. The lead wire 12a and the terminal portion 12b of the leader wire 12 pass through the recess 49 (see also FIG. 1). Note that the alignment portion 44 is provided in a portion where the enlarged diameter portion 46 is not provided.

As shown in FIG. 5, a cylindrical spring fixing member 52 is fitted into the second through hole 48b. The spring fixing member 52 is a rivet. A spring member (coil spring) 54 is fitted into the outer peripheral surface of the body portion 52 a of the spring fixing member (rivet) 52 . A spring member 54 is attached to the annular member 42 by a spring fixing member 52 . As shown in FIG. 6, a cylindrical regulating member 50 is fitted into the first through hole 48a. The regulating member 50 is a rivet, and is the same component as the spring fixing member 52. In the lock mechanism 40, the regulating member 50 and the spring fixing member 52 are the same part, but the regulating member 50 and the spring fixing member 52 may be different parts having different sizes, for example.

The operation of the locking mechanism 40 will be explained with reference to FIGS. 7 and 8. FIG. 7 shows a state in which the locking mechanism 40 is attached to the pedestal portion 60, and shows a cross section in which the spring member 54 appears. Note that in FIG. 7, the electrode portion 20 is shown in a simplified manner for clarity of the drawing (only the fixing portion 22 in FIG. 2 is shown). An end of the spring member 54 (an end opposite to the side attached to the spring fixing member 52) is in contact with a stepped portion 63 of a guide portion 64 formed within the pedestal portion 60.
As described above, the guide portion 64 has a truncated conical shape. By bringing the end of the spring member 54 into contact with the stepped portion 63 of the guide portion 64, the position of the spring member 54 with respect to the pedestal portion 60 is defined, and the position of the locking mechanism 40 with respect to the pedestal portion 60 is always maintained at a desired position. be able to. When the cylindrical cutout 100 is stationary, the locking mechanism 40 exists in the axial direction of the pedestal portion 60 at a position where its own weight and the tension force of the spring member 54 are balanced (the position indicated by the solid line). When the cylindrical cutout 100 moves up and down (vibrates up and down), the position of the locking mechanism 40 in the axial direction changes with respect to the base part 60 due to inertia force. For example, from the point in time when the upward to downward movement speed of the cylindrical cutout 100 begins to decrease, to the point in time when the downward movement of the cylindrical cutout ends and begins to move upward, and the upward movement speed increases. Until then, the spring member 54 is compressed, and the locking mechanism 40 is located below the rest position (the position indicated by the broken line).

FIG. 8 shows a cross section in which the regulating member 50 appears when the locking mechanism 40 is attached to the pedestal 60. When the locking mechanism 40 is in the rest position, a large gap is provided between the tip 26 of the contact portion 24 and the locking mechanism 40 (regulating member 50). More specifically, within the pedestal portion 60, the axial positions of the tip portion 26 and the regulating member 50 are different. Therefore, when the locking mechanism 40 is in a stationary position (the cylindrical cutout 100 is not moving up and down), the intermediate portion of the contact portion 24 (the portion protruding from the surface of the fixed portion 22) is deformed radially outward. This is possible, and the fuse tube 6 can be easily attached to and detached from the main insulator 8.

On the other hand, when the locking mechanism 40 moves to the position indicated by the broken line (the position where the spring member 54 is compressed) due to the vibration movement of the cylindrical cutout 100, the tip 26 of the contact portion 24 contacts the regulating member 50 (or the tip 26 and the regulating member 50 is substantially eliminated), deformation of the contact portion 24 is regulated. More specifically, the intermediate portion of the contact portion 24 is prevented from deforming radially outward. As a result, the contact portion 24 continues to sandwich the outer circumferential surface of the fuse cylinder 6, and the fuse cylinder 6 can be prevented from coming off from the lower electrode 10. By preventing the fuse tube 6 from coming off the lower electrode 10, the fuse tube 6 can be prevented from being ejected to the outside of the main insulator 8.

Other features of the locking mechanism 40 will be described with reference to FIG. 9. In addition, in FIG. 9, the electrode part 20 is shown in a simplified manner for clarity of the drawing (only the fixing part 22 in FIG. 2 is shown). As described above, the outer circumferential surface of the annular member 42 is provided with a positioning portion 44 that protrudes radially outward (see FIG. 4). The locking mechanism 40 is attached within the pedestal section 60 such that the alignment section 44 is located within the notch 62 of the pedestal section 60. More specifically, the locking mechanism 40 is attached within the pedestal section 60 such that the alignment section 44 and the side wall of the notch section 62 come into contact when the locking mechanism 40 rotates. The alignment portion 44 and the cutout portion 62 can prevent the locking mechanism 40 from rotating relative to the base portion 60. By preventing rotation of the locking mechanism 40, it is possible to prevent displacement of the tip end 26 of the contact portion 24 and the regulating member 50 in the circumferential direction.

Further, as described above, the cutout portion 62 extends along the axis of the pedestal portion 60. Therefore, when the lock mechanism 40 moves up and down (the position in the axial direction with respect to the pedestal section 60 changes), the movement of the lock mechanism 40 can be smoothly guided by the positioning section 44 and the notch section 62. The positioning portion 44 and the notch portion 62 can also be considered as a guide portion for smoothly moving the locking mechanism 40 up and down.

(Lower electrode: 2nd example)
The lower electrode 110 will be explained with reference to FIGS. 10 to 13. The lower electrode 110 is a modification of the lower electrode 10, and the shapes of the electrode part 120 and lock mechanism 140 are different from the electrode part 20 and lock mechanism 40 of the lower electrode 10. A bottom electrode 110 can be used in place of the bottom electrode 10 in the cylindrical cutout 100. Regarding the lower electrode 110, a configuration that is substantially the same as the lower electrode 10 may be designated by a reference number that is the same as the reference number assigned to the lower electrode 10 or has the same last two digits, and a description thereof may be omitted. .

As shown in FIG. 10, in the lower electrode 110, three contact parts 24 are fixed to the fixed part 22. The form of the contact part 24 and the form of fixation of the contact part 24 to the fixing part 22 are the same as those of the lower electrode 10 (see FIG. 3).

The lock mechanism 140 will be described with reference to FIGS. 11 to 13. The locking mechanism 140 includes a ring-shaped annular member 142, a spring member 154, and a positioning member 151. As shown in FIG. 11, the annular member 142 is a ring-shaped plate, and through holes 148 passing through the front and back surfaces are formed at three locations in the circumferential direction. The through holes 148 are provided at equal intervals in the circumferential direction of the annular member 142 (at an angle of 120 degrees with respect to the axis of the annular member 142). A positioning member 151 is attached to each through hole 148 . A positioning portion 144 is provided on the outer peripheral surface of the annular member 142 and projects radially outward. Further, a protrusion 147 that protrudes toward the center of the annular member 142 is provided in a portion of the annular member 142 in the circumferential direction. In the protrusion 147, the inner diameter and outer diameter of the annular member 142 are smaller than in other parts. The through hole 148 is formed in a portion of the annular member 142 in the circumferential direction where the alignment portion 144 and the protrusion portion 147 are not provided. Although details will be described later, in the locking mechanism 140, the tip end 26 of the contact portion 24 contacts the inner circumferential surface 145 of the annular member 142, and deformation of the contact portion 24 is restricted. That is, in the lock mechanism 140, the annular member 142 functions as a regulating member that regulates the deformation of the contact portion 24.

As shown in FIG. 12, the positioning member 151 is attached to the annular member 142 using the through hole 148. The positioning member 151 is a bolt, and is fastened to the annular member 142 by a nut 152 provided on the back side of the annular member 142. The positioning member 151 is provided with a protrusion 151a that protrudes upward. Further, a spring member (coil spring) 154 is attached to the nut 152.

The operation of the locking mechanism 140 will be described with reference to FIG. 13. FIG. 13 shows a cross section taken along line AOB in FIG. 11. In FIG. 13, both the positioning member 151 and the contact portion 24 are visible. An end portion of the spring member 154 is fixed to a spring support portion 64 formed within the base portion 60. When cylindrical cutout 100 is stationary, the tension of spring member 154 applies an upwardly moving force to annular member 142 (locking mechanism 140). As shown by the solid line in FIG. 13, when an upward force is applied to the locking mechanism 140, the protrusion 151a provided on the positioning member 151 comes into contact with the back surface 22a of the fixed part 22 (electrode part 120). . When the positioning member 151 (protrusion 151a) is in contact with the fixed part 22, a large gap is provided between the tip 26 of the contact part 24 and the annular member 142 (lock mechanism 140), and the contact part 24 is in contact with the fixed part 22. Deformable.

From the point in time when the upward to downward movement speed of the cylindrical cutout 100 begins to decrease to the point in time when the downward movement of the cylindrical cutout ends and begins to move upward, and the upward movement speed increases. During this time, the spring member 154 is compressed and the annular member 142 (locking mechanism 140) moves to the position shown by the broken line. As a result, the tip portion 26 of the contact portion 24 contacts the inner peripheral surface 145 of the annular member 142, deformation of the contact portion 24 is restricted, and the contact portion 24 continues to clamp the outer peripheral surface of the fuse tube 6. That is, the annular member 142 functions as a regulating member that regulates the deformation of the contact portion 24. Note that the alignment portion 144 is located within the cutout portion 62 of the pedestal portion 60, and serves as a guide for preventing the locking mechanism 140 from rotating relative to the pedestal portion 60 and for smoothly moving the locking mechanism 140 up and down. function as a department.

In the lower electrode 110, by attaching the positioning member 151 to the annular member 142, the annular member 142 is biased against the fixed part 22 by the spring member 154 when the cylindrical cutout 100 is stationary. As a result, the position of the locking mechanism 140 within the pedestal section 60 can be maintained at an appropriate position (a position where it does not come into contact with the contact section 24). Further, even when the vibration movement of the cylindrical cutout 100 is relatively small, the biasing force of the spring member 154 allows the locking mechanism 140 to continue to be held in a position where it does not come into contact with the contact portion 24. The cylindrical cutout 100 undergoes an oscillatory movement due to the emitted gas inside the cylindrical cutout 100, and the downward movement of the cylindrical cutout starts from the point at which the upward to downward movement speed of the cylindrical cutout 100 starts to decrease. The spring member 154 is compressed to move the annular member 142 to the downward position until the end of the upward movement begins and the speed of upward movement increases. The tip portion 26 of the contact portion 24 contacts the inner circumferential surface 145 of the annular member 142, and deformation of the contact portion 24 is restricted. A component (for example, the regulating member 50 in the lower electrode 10) that is only for regulating the deformation of the contact portion 24 in the annular member 142 can be omitted. Therefore, the number of components of the lower electrode 110 can be reduced, and the cost of the lower electrode 110 can be reduced.

(Lower electrode: 3rd example)
The lower electrode 210 will be described with reference to FIGS. 14 and 15. The lower electrode 210 is a modification of the lower electrode 110, and the form of the lock mechanism 240 is different from the lock mechanism 140 of the lower electrode 110. The bottom electrode 210 can be used in the cylindrical cutout 100 in place of the bottom electrode 10. Regarding the lower electrode 210, configurations that are substantially the same as the lower electrode 110 may be designated by reference numbers that are the same as the reference numbers assigned to the lower electrode 110 or have the same last two digits, and the description thereof may be omitted. . Note that the lower electrode 210 has three contact portions 24.

In the lower electrode 210, the locking mechanism 240 includes a ring-shaped annular member 242 and a spring member 254. As shown in FIG. 14, the annular member 242 is a ring-shaped plate, and a positioning portion 244 that protrudes radially outward is provided on the outer circumferential surface, and the center of the annular member 242 is partially located in the circumferential direction. A protrusion 247 is provided that protrudes toward. The annular member 242 is not provided with a through hole. That is, the annular member 242 is obtained by removing the through hole 148 from the annular member 142 (see comparison in FIG. 11).

As shown in FIG. 15, a spring member 254 is disposed between the annular member 242 and the spring support portion 64 formed on the pedestal portion 60. As shown in FIG. The diameter of the spring member 254 is larger than the inner diameter of the annular member 242 and smaller than the outer diameter of the annular member 242. One end of the spring member 254 is fixed to the annular member 242, and the other end is fixed to the spring support portion 64. In the lower electrode 210, when the cylindrical cutout 100 is stationary, the locking mechanism 240 is located at a position where its own weight and the tension force of the spring member 254 are balanced (the position indicated by the solid line). At this time, since a large gap is provided between the tip 26 of the contact portion 24 and the annular member 242 (lock mechanism 240), the contact portion 24 can be deformed.

The cylindrical cutout 100 performs an oscillatory movement, and from the point at which the upward to downward movement speed of the cylindrical cutout 100 begins to decrease, the downward movement of the cylindrical cutout ends and begins to move upward, and Until the speed of movement increases, the spring member 254 is compressed and the annular member 242 (locking mechanism 240) moves to the position shown by the dashed line. As a result, the tip portion 26 of the contact portion 24 contacts the inner peripheral surface 245 of the annular member 242, deformation of the contact portion 24 is restricted, and the contact portion 24 continues to clamp the outer peripheral surface of the fuse cylinder 6. That is, in the lower electrode 210, similarly to the lower electrode 110, the annular member 242 functions as a regulating member that regulates the deformation of the contact portion 24. Note that the positioning portion 244 is located within the cutout portion 62 of the pedestal portion 60, and serves as a guide for preventing the locking mechanism 240 from rotating relative to the pedestal portion 60 and for smoothly moving the locking mechanism 240 up and down. function as a department.

(Other variations)
In the above embodiment, a lower electrode (lower electrode 10) having two contact portions and a lower electrode (lower electrode 110, 210) having three contact portions have been described. However, in the lower electrode disclosed herein, the number of contact parts is arbitrary. For example, the number of contact parts in the lower electrode 10 may be three or more, and the number of contact parts in the lower electrodes 110 and 210 may be two or more.

In the embodiment described above, a recess (recess 49, 149, 249) is provided on the outer peripheral surface of the annular member, and the lead wire 12a of the leader wire 12 and the terminal portion 12b pass through the recess. However, it is also possible to connect the lower electrode and the lead wire 12 with a conductive plate or the like and omit the lead wire 12a. In that case, it is also possible to omit providing a recess on the outer peripheral surface of the annular member.

In the first embodiment, a locking mechanism has a regulating member fixed to an annular member, in the second embodiment, a locking mechanism has a positioning member fixed to an annular member, and in the third embodiment, a regulating member and a positioning member are fixed to an annular member. A lower electrode including a locking mechanism in which parts are not fixed has been described. In the lower electrode of each embodiment, whether or not to fix the regulating member (the regulating member separate from the annular member) and the positioning member to the annular member can be arbitrarily selected depending on the purpose and application. For example, a positioning member may be further fixed to the annular member of the first embodiment, or a regulating member separate from the annular member may be fixed to the annular member of the second embodiment. Alternatively, the positioning member may be omitted in the second embodiment. In the second embodiment, the spring member is fixed to the annular member using a positioning member (using a nut that fixes the positioning member). However, in the locking mechanism of the second embodiment, similarly to the locking mechanism of the first embodiment, the spring member is fixed to the annular member using a member (spring fixing member) only for fixing the spring member to the annular member. You can.

In the first embodiment, the regulating member and the spring fixing member are fastened to the annular member with rivets, and in the second embodiment, the positioning member is fastened to the annular member with bolts. The means for fixing parts (regulating member, spring fixing member, and positioning member) separate from the annular member to the annular member are arbitrary, and instead of the above-mentioned rivet or bolt fastening, welding or fixing the annular member A thread groove may be formed in the through hole, a thread may be formed in a component separate from the annular member, and that component may be screwed to the annular member. In addition, in the first embodiment, a mode in which a cylindrical regulating member is fixed to an annular member has been described, but the shape of the regulating member is arbitrary, and may be polygonal (flat plate shape, prismatic shape, etc.), for example. . Further, instead of fixing a regulating member separate from the annular member to the annular member, a part of the annular member in the circumferential direction may be bent and a regulating portion may be provided in the annular member (the annular member and the regulating member may be (It may be a single piece)

In the first embodiment, the positioning portions were provided at two positions in the circumferential direction of the annular member, and in the second and third examples, the positioning portions were provided at one position in the circumferential direction of the annular member. However, the number of alignment parts is arbitrary, and the alignment parts may be provided at three locations in the circumferential direction of the annular member, or the alignment parts may be omitted from the annular member.

In the above embodiment, an example was described in which the annular member is held at a predetermined position (a position where it does not contact the contact portion) using the tension of the spring member when the cylindrical cutout is stationary. That is, in the above embodiment, the spring member pushes the annular member upward and maintains the position of the annular member. However, the compressive force of the spring member may be used to hold the annular member in place. That is, the spring member may be arranged above the annular member, and the annular member may be suspended from the upper surface of the pedestal.

In the embodiments described above, an example in which the fuse tube is disposed within the cylindrical cutout body has been described. However, instead of a fuse tube, a current limiting fuse may be arranged within the cylindrical cutout body. A current limiting fuse is also an example of a power fuse. Typically, a cylindrical cutout with a current limiting fuse placed inside will not outgas by interrupting the high current. Therefore, in the cylindrical cutout in which the current limiting fuse is arranged, the cylindrical cutout does not perform vertical oscillating motion (positional fluctuation) due to generation of released gas. However, current limiting fuses contain an insulating core and arc-extinguishing sand and are typically heavier than the fuse tube. Therefore, for example, depending on vibrations that occur due to a large earthquake or an accident involving a large automobile, there is a possibility that vertical vibrational motion may occur in the cylindrical cutout. Even in a cylindrical cutout in which a current limiting fuse is disposed inside, if the locking mechanism disclosed in the above embodiment is provided, the lower electrode of the current limiting fuse can be prevented from coming off from the lower electrode of the cylindrical cutout. The current limiting fuse can prevent the cylindrical cutout body from detaching to the outside. Therefore, the technique disclosed in this specification (the technique in which the lower electrode is provided with a locking mechanism) can be usefully applied even to a cylindrical cutout in which a current limiting fuse is disposed.

In the above embodiment, when the vibration motion of the cylindrical cutout changes from downward movement to upward movement, the tip of the contact part is brought into contact with the regulating member (a regulating member separate from the annular member, or the annular member itself). explained. However, in the lower electrode disclosed herein, the locking mechanism is such that when the vibrational motion of the cylindrical cutout changes from downward movement to upward movement, the intermediate portion of the contact portion (the portion that contacts the fuse barrel) deforms. It may be a structure that regulates What is important in the technology disclosed in this specification is that when a detachment force is applied to the lower electrode to move it to the outside of the cylindrical cutout body relative to the fuse tube due to positional change of the cylindrical cutout body ( This means that a locking mechanism is provided to hold the lower electrode portion of the fuse cylinder when the vibration movement changes from downward movement to upward movement.

Although specific examples of the present invention have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The techniques described in the claims include various modifications and changes to the specific examples illustrated above. Further, the technical elements described in this specification or the drawings exhibit technical usefulness singly or in various combinations, and are not limited to the combinations described in the claims as filed. Furthermore, the techniques illustrated in this specification or the drawings can achieve multiple objectives simultaneously, and achieving one of the objectives has technical utility in itself.

6: Fuse cylinder 10: Lower electrode 20: Lock mechanism 24: Contact part 60: Pedestal part 100: Cylindrical cutout

Claims (7)

A lower electrode connected to both the high voltage equipment side wiring and the power fuse in the cylindrical cutout connected to the power distribution line and the high voltage equipment side wiring,
The lower electrode is
A pedestal part fixed to the cylindrical cutout body,
a contact part that is fixed to the pedestal part and contacts the outer peripheral surface of the lower electrode part of the power fuse;
It is attached to the pedestal and holds the lower electrode part of the power fuse when a detachment force is applied to the power fuse that moves the power fuse to the outside of the cylindrical cutout body due to positional change of the cylindrical cutout body. It is equipped with a locking mechanism to
The locking mechanism includes a regulating member that comes into contact with the contact portion and restricts deformation of the contact portion,
The regulating member is a lower electrode of the cylindrical cutout whose position relative to the pedestal changes due to the inertia force generated in the regulating member itself when the regulating member changes its position as the position of the cylindrical cutout body changes. The contact portion has a structure that deforms in the radial direction when the power fuse is inserted into and removed from the cylindrical cutout body,
The lower electrode according to claim 1, wherein the locking mechanism restricts radial deformation of the contact portion when the detachment force is applied to the power fuse. A plurality of the contact portions are provided in the circumferential direction of the lower electrode,
The locking mechanism includes a ring-shaped annular member,
The lower electrode according to claim 1 or 2, wherein regulating members are provided at a plurality of locations in the circumferential direction of the annular member. 4. The lower electrode according to claim 3, wherein the regulating member is provided on the annular member so as to protrude from the surface of the annular member at a position corresponding to the contact portion. The lower electrode according to claim 1 or 2, wherein the regulating member is a ring-shaped annular member. The lower electrode according to any one of claims 3 to 5, wherein the annular member is attached to the pedestal via a spring member. The lower electrode according to claim 6, which refers to claim 3 or 4, wherein the annular member is provided with a positioning member that positions the annular member with respect to the pedestal portion against the biasing force of the spring member.

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