JPS5843170Y2 - Protective cover mounting structure for live parts in cut-out switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for attaching a protective cover to a live part of a cut-in/out switch.

Conventionally, in open type cut-out switches in which the lower part of the fuse cylinder is rotatably attached to the lower part of the main body insulator, the fuse is installed to insulate and shield the live parts exposed to the outside, such as the electrodes on the upper and lower parts of the fuse cylinder. After the cylinder is assembled, it is common to attach a highly insulating protective cover made of rubber or resin to the live part.

However, the above-mentioned conventional installation work is not only time-consuming because it is done after the fuse tube has been assembled, but also the fuse tube cannot rotate once the cover is attached, so the protective cover must be removed one by one when opening and closing operations. There was a flaw.

The purpose of this invention is to eliminate the above-mentioned conventional defects and to use a current-limiting fuse instead of a discharge type fuse, and to make it possible to easily attach the protective cover for the live parts, so that the current-limiting fuse can be used even with the protective cover attached. It is an object of the present invention to provide a protective cover mounting structure that allows replacement of fuses and opening/closing operations.

An embodiment of the present invention in a cutout switch equipped with a load switching device will be described below with reference to the drawings.
In the drawing, reference numeral 1 denotes a mounting plate with a slightly bent central portion, on the back of which a arm mounting bracket 2 is fixed, and on the front, a pair of flanges 3 in the shape of a short cylinder with a bottom are provided at two locations, upper and lower. It is fixed with bolts.

Reference numeral 4 denotes a horizontally extending cylindrical upper support insulator whose base end is fixed to the upper flange 3 by cementing, and an insulating fold 4a is formed on the outer periphery.

Reference numeral 5 designates a cylindrical lower support insulator extending diagonally downward, the base end of which is fixed to the lower flange 3 by cementing, and an insulating fold 5a is formed on the outer periphery.

Here, to briefly explain the opening/closing mechanism attached to the upper and lower support insulators 4.5 which are arranged in an approximately horizontal V-shape as a whole and form the main body insulator. A load switching device M described below is installed, and the base end of a current limiting fuse F, which will be described later, is rotatably supported at the tip of the lower support insulator 5, and the current limiting fuse F is indicated by the solid line in Figure 1. When it is in the position shown, it is in the closed state, and when it is in the position shown by the two-dot chain line in the figure, it is in the open state.

First, the load switchgear M installed in the upper support insulator 4 will be explained with reference to FIGS. 2 to 5.
The flange part 6a is fixed to the stepped part 4b between the hollow part A formed at the tip of the hollow part A and the hollow part B with a smaller diameter than the hollow part A, and extends into the hollow part B with a bottom. A cylindrical mounting tube 7 is a fixed electrode screwed into the center of the bottom surface of the mounting tube 6, and there are several slots on the outer circumference of the fixed electrode (7).
a is formed.

8 is a terminal terminal tightened and fixed to the outer surface of the base end of the fixed electrode 7 with a bolt 9; 10 is an upper lead wire that is protected and fixed to the upper outer periphery of the hollow part A of the upper support insulator 4 with a molded cone 11; A lead wire 12 coated with insulation is connected between the terminal terminal 8 and the terminal terminal 8 .

Reference numeral 13 denotes an arc extinguishing cylinder made of synthetic resin screwed and fixed to the base end male threaded portion 7b of the fixed electrode 7, and 14 an insulating material loosely fitted around the outer periphery of the arc extinguishing cylinder 13 so as to be movable in the axial direction. A guide tube for attaching a movable electrode rod 17, which will be described later, has a short cylindrical lid 15 screwed onto its outer end, and has an inner end that regulates the distance from the inner circumferential surface of the mounting tube 6. A slide ring 16 for this purpose is also screwed together.

Protrusions 16 a are formed at 13 locations on the outer circumference of the slide ring 16 , and the protrusions 16 a slide into guide grooves 6 b that are integrally formed on the inner peripheral surface of the mounting tube 6 in parallel with the axial direction. The guide cylinder 14 is movably engaged so that rotation of the guide cylinder 14 is restricted.

Reference numeral 17 denotes a movable electrode rod 18 that is attached to the center of the inner surface of the lid 15 of the guide cylinder 14 so as to be able to come into contact with and separate from the fixed electrode 7, and has an arc-resistant metal 1 attached to its tip.
An arc extinguishing rod 20 is fixed via 9.

Reference numeral 21 denotes a coil spring interposed between a locking flange 13a integrally formed on the outer periphery of the distal end of the arc extinguishing cylinder 13 and a locking flange 16b integrally formed on the inner periphery of the slide ring 16, which is connected to the fixed electrode. The movable electrode rod 17 is always energized in the direction in which the movable electrode rod 17 is inserted into contact with the electrode 7.

As shown in FIG. 5, 22 is a pair of contact plates fixed to the outer surface of the lid 15 of the guide cylinder 14 by bolts 18 for fixing the movable electrode rod 17, and 23 is a bolt 18 fixed to the lid 15 on the outside surface of the guide tube 14.
This is a hook for opening and closing the movable electrode rod 17 which is fixed to the movable electrode rod 17.

Next, the mounting structure of the base end of the current limiting fuse F, which is supported rotatably in the vertical direction at the tip of the lower support insulator 5, will be explained with reference to FIGS. A mounting plate 25 is installed horizontally with bolts (not shown) to the stepped portion 5b of the formed hollow part A' and hollow part B' with a smaller diameter than the hollow part A'. These are a pair of fixed supporting metal fittings, and upward supporting recesses 25a are formed at the upper ends of these fittings.

26 is an insulating tube of a current limiting fuse F having a large number of insulation pleats as shown in FIG. 8; 27 is a lower electrode exposed at the lower end of the fuse F;
8 is suspended, and a groove 27 is formed on the outer circumferential side parallel to the axial direction.
A is provided.

Reference numeral 29 denotes a lower adapter electrode which is removably attached to the lower electrode 27 of the current limiting fuse F and is formed into a substantially rectangular cylinder shape by connecting a pair of electrode fittings 30 and 31 having a U-shape in plan with bolts. A tightening bolt 32 is threaded through one of the electrode fittings 30, and its tip is pressed against the groove 27a of the lower electrode 27 and is unrotatably tightened. It will be worn.

33 is a contact blade protruding from the outer surface of the electrode fitting 31;
4 is the support metal fitting 25 on both sides of another electrode metal fitting 30.
Notch surface 3 protruding to correspond to support recess 25a of
4a, and serves as a common support shaft for the lower electrode 27 and the contact blade 33.

Reference numeral 35 denotes a protective cover made of an insulating material for insulating the lower adapter electrode 29 (live part), which is removably but unrotatably hung on the connecting pin 34 of the lower adapter electrode 29; A cylindrical connecting pin 36 having a recess 36a that covers the entire connecting pin 34 is fixed to the tips of both sides of the connecting pin 55, and the connecting pin 36 is rotatable by the support recess 25a of the support fitting 25. Supported.

Furthermore, the relative rotation between the adapter electrode 29 and the protective cover 35 is prevented by the engagement between the connecting pin 34 having the cutout surface 34 a of the adapter electrode 29 and the connecting pin 36 on the protective cover 35 side having the semi-cylindrical recess 36 a. I try not to move.

Furthermore, after engaging the connecting pin 36 of the protective cover 35 with the support recesses 25a of the pair of support fittings 25, the lower adapter electrode 29 is attached to the lower electrode 27 of the current limiting fuse F, and the connecting pin of the electrode 29 is attached. 34 to the connecting pin 36
The fuse F is attached to the lower support insulator 5 by fitting it into the recess 36a (as shown in FIG. 7, the cover 35 is rotated toward the contact piece 37 and the recess 36a is facing upward). However, in this example, the connecting pin 3
6 is slightly larger than the interval L between the supporting recesses 25a (the diameter of the radial arc-shaped support portion 25b is the same as or slightly larger than the outer diameter of the connecting pin 36), so the above-mentioned assembly At the time of attachment, the connecting pin 36 is forcibly driven into the support recess 25a.

37 is a hollow part A' of the lower support insulator 5 as shown in FIG.
A pair of fixed contact pieces are vertically fixed to the lower part of the inner circumferential surface so as to correspond to the contact blades 33 of the adapter electrode 29, and a mold cone 38 is provided at the base end thereof to the lower outer circumferential surface of the hollow part A'. A lower lead wire 39 protected and fixed is connected.

Next, a second opening/closing mechanism is attached to the upper end of the current limiting fuse F, which is rotatably supported with respect to the lower support insulator 5, and is configured to open and close the load switching device M described above.
5 will be explained. As shown in FIG. 5, 40 is an upper electrode fixed to the upper end of the current limiting fuse F,
A bolt 41 is provided protruding from the top surface.

Reference numeral 42 denotes an upper adapter electrode which is removably fitted onto the upper electrode 40 and fixed by screwing a nut 41a onto the bolt 41, and is provided on one side of the upper adapter electrode on the load switchgear M side. A contactor 43 that is inserted into and comes into contact with the pair of contact plates 22 is integrally formed.

Reference numeral 44 denotes a locking protrusion protruding from the upper surface of the contactor 43 of the adapter electrode 42, and is capable of engaging and disengaging from the hook 23 provided on the load switching device M side.

That is, as shown in FIG.
is inserted between the contact plates 22, the locking protrusion 44 is locked to the hook 23, and the current limiting fuse F is further rotated clockwise in the same figure, so that the locking protrusion 44
When the upper end of the hook 23 is lower than the lower end of the hook 23, the locking protrusion 44 is disengaged from the hook 23.

This state is shown in FIG. 3. This position is also the position where the movable electrode rod 17 of the load switching device M has been separated from the fixed electrode 7 and both electrodes 7 and 17 have already been disconnected from the load.

Next, as shown in FIG. 2, in the closed state where the contact 43 on the side of the current limiting fuse F, which has been closed, is inserted between the contact plates 22 of the load switching device M, The locking mechanism for holding the fuse F in a predetermined position will be explained with reference to FIGS.
6 is fitted onto the outer periphery of the adapter electrode 42 and is attached to the mounting rib 4.
The mounting tube 48 is a locking pin formed by projecting the lower bolt 47 to the side.

Reference numeral 49 indicates two mounting bosses fixed to the upper and lower sides of the outer surface of the flange portion 6a of the mounting tube 6 fixed to the stepped portion 4b of the upper support insulator 4; a pair of support arms, each support arm 5
An inverted U-shaped support portion 50a is integrally bent at the tip of the 0.

Reference numeral 51 denotes a hook plate whose base end is rotatably attached to a shaft 52 in the support portion 50 a of the support arm 50 , and a hook plate 51 is provided on the lower side of each hook plate 51 and protrudes to the side of the adapter electrode 42 . A locking recess 51a that engages with the locking pin 40 is formed.

53 has an intermediate portion wound around the shaft 52 of the hook plate 51, one end of which is secured to the upper edge of the hook plate 51, and the other end of which is attached to the support portion 50a.
The hook plate 51 is constantly biased to rotate downward.

The position where the locking pin 48 fixed to the adapter electrode 42 side is locked in the locking recess 51a of the pair of hook plates 51 is as shown in FIG. 2 and FIGS. 4
3 is in a closed circuit state in which the locking protrusion 44 is locked in the hook 23 and the hook plate 51 is in the closed circuit state.
The interval L1 between the locking recesses 51a is made larger than the diameter of the locking pin 48, so that when the current limiting fuse F is closed, the locking protrusion 44 moves the hook 23 to the side as shown by the arrow P in FIG. It is designed to be pushed away and locked inside the hook 23.

Reference numeral 54 denotes a support protrusion 4 integrally formed on the back side of the mounting tube 46.
6a, a pair of actuating arms for unlocking the hook plate 51 rotatably attached to the shaft 55, which are positioned directly below the hook plate 51 in the closed circuit state shown in FIGS. 2 and 4. ing.

56 has an intermediate portion wound around the shaft 55 of the actuating arm 54;
It is a spring whose one end is locked to the lower edge of the support protrusion 46a and the other end is locked to the lower edge of the proximal end of the actuating arm 54, and the actuating arm 54 is rotated counterclockwise in FIG. It is energizing.

Note that a hole 57 for operation is provided at the base end of the operating arm 54.
is the provision.

Next, the operation of the cutout switch constructed as described above will be explained with reference to FIGS. 1 to 3 and FIGS. 6 and 7.

Now, the solid lines in Figures 1 and 2 and Figure 6 show the closed circuit state in which the load switching device M in the upper support insulator 4 is closed and the upper adapter electrode 42 of the current limiting fuse F is inserted into the upper support insulator 4. It shows.

The energization path in this closed state is the upper lead wire 10→
Lead wire 12 → terminal terminal 8 → fixed electrode 7 → movable electrode rod 17 → lid 15 → contact plate 22 → contactor 43 → upper adapter electrode 42 → upper electrode 40 → fuse element (not shown) → lower electrode 27 → lower part Adapter electrode 29 → contact blade 33 → fixed contact piece 37 → lower lead wire 39.

Now, when releasing from the closing state shown by the solid line in FIGS. 1 and 2, when the operating rod is hooked into the hole 57 at the base end of the operating arm 54 and pulled downward, the operating arm 54 is rotated around the shaft 55 by the spring 5.
6 in the clockwise direction in FIG. The locking recess 51a of the hook plate 51 is separated from the locking pin 48 fixed to the upper adapter electrode 42, and the locked state by the hook plate 51 is released. Ru.

(See the dotted chain line in Figure 2) After releasing the locked state between the hook plate 51 and the locking pin 48, further pull the operation rod to move the current limiting fuse F to the first position around the lower end connecting pin 34. , 2, the locking protrusion 44 on the top surface of the contact 43 of the upper adapter electrode 42 engages the hook 23.
Since the movable electrode rod 17 and the guide cylinder 14 are moved in the same direction while being locked to the fixed electrode 7, the movable electrode rod 17 and the guide tube 14 are moved in a direction away from the fixed electrode 7 (to the right in FIG. 2) while compressing the coil spring 21.

Then, when the movable electrode rod 17 separates from the fixed electrode 7,
The arc generated between the arc-resistant metal 19 and the arc-extinguishing frame 20 and the arc-extinguishing cylinder 13 are extinguished by a narrow gap.

Note that the residual gas is released from a peripheral gas vent hole (not shown) of the arc extinguisher cylinder 13.

As shown in FIG. 3, when the current limiting fuse F is rotated until the load switching device M is opened, the current limiting fuse F moves in an arc and the hook 23 moves linearly, so that the upper adapter electrode 42 When the locking protrusion 44 is below the lower end of the hook 23, it is released from the hook 23, and the contact 43
is spaced apart from the contact plate 22.

Then, the movable electrode rod 17, guide tube 14, lid 15, contact plate 22, hook 23, etc. are returned to the insertion position shown in FIG. 2 all at once by the compressed spring 21.

On the other hand, the lower adapter electrode 29 (charged part) of the current limiting fuse F is also rotated clockwise in FIG. The protective cover 35 of the current charging part is also rotated in the same direction.

Further, the fuse F is rotated, and the contact blade 33 of the lower adapter electrode 29 is separated from the fixed contact piece 37 (this time is after the load switching device M is opened), and the fuse F is moved to the seventh position.
As shown in the figure, the protective cover 3 is in a drooping state.
5 is rotated approximately 180° around the connecting pins 34 and 36 and moved into the hollow portion A' of the support insulator 5.

On the other hand, in order to change from the open state shown by the two-dot chain line in FIG. 1 to the closed state, the current limiting fuse F is rotated counterclockwise in the same figure.

Then, the contact 43 of the upper adapter electrode 42 is attached to the contact plate 2.
At the same time, the locking protrusion 44 of the contact 43 is brought into contact with the outer peripheral surface of the distal end of the hook 23, and the locking protrusion 44 holds the hook 23 laterally around the proximal end (Fig. 5P). When the locking protrusion 44 passes over the tip of the folded portion of the hook 23, the locking protrusion 44 is locked to the hook 23.

At the same time, the locking pin 48 of the upper adapter electrode 42 forms an arcuate oblique portion 5 below the tip of the hook plate 51.
1b, the hook plate 51 is rotated counterclockwise in FIG. It is locked in the locking recess 51a, and the current limiting fuse F is locked in the closed state.

On the other hand, the protective cover 35 of the lower adapter electrode 29 is also slightly protruded out of the lower support insulator 5, as shown in FIG. 6, to protect the two lower adapter electrodes (live parts).

By the way, when an excessive current flows in the electrical circuit due to an overload or short circuit, the current limiting fuse F is blown and the electrical circuit is opened. After releasing the connecting pin 34, insert the connecting pin 34 into the support recess 25a of the support fitting 25 (the recess 3 of the connecting pin 36).
6a), then remove both the upper and lower adapter electrodes 42.29 from the current limiting fuse, replace the current limiting fuse, attach the adapter electrode 42.29 again, and then fit it into the support recess 25a of the support fitting 25. The connecting pin 34 may be engaged with the recess 36a of the connecting pin 36.

Now, according to the above-mentioned cutout switch, it is possible to switch on and off the load, and even if an abnormal current flows due to an accident, it is possible to cut off the electric circuit and prevent damage to the equipment. , a pair of support fittings 25 are arranged diagonally downward in the hollow portion A' at the tip of the lower support insulator 5, and a support recess 25 is provided at the top of the tip of both fittings 25.
A is formed with a notch, and the lower electrode 27 of the current-limiting fuse F is
A lower adapter electrode 29 is removably fixed to the lower adapter electrode 29, and a semi-cylindrical connecting pin 34 corresponding to the support recess 25a is provided protruding from both sides of the adapter electrode 29. A cover 35 that protects the adapter electrode 29 is removably attached and unrotatably attached by a connecting pin 35 fitted to the pin 34, and the protective cover 35 is assembled to the cut-out switch of the current-limiting fuse F. Since it is constructed so that they can be installed at the same time, unlike the conventional method, the troublesome work of installing the fuse after installation is eliminated, and installation can be made very easily.

In addition, in the embodiment of the present invention, the support recess 2 of the support fitting 25
Since the protective cover 35 is removably engaged with the protective cover 5a, even if the protective cover is damaged and needs to be repaired or replaced, it can be easily removed with a single touch.

In particular, in the present invention, the protective cover 35 is attached to allow rotation of the current limiting fuse F, so unlike the conventional case, there is no need to remove the protective cover 35 each time the load switching device M is opened and closed. It's easy to do.

In the above embodiment, the lower adapter electrode 29 was removably fixed to the lower electrode 27 of the current-limiting fuse F. 34 is not structured to be directly attached, there is no need to discard it when replacing the fuse, and the fuse F can be manufactured at low cost.

As detailed above, the present invention has a protective cover covering the outside of the lower adapter electrode that can be removed from the notch surface of the connecting pin of the lower adapter electrode so as to follow the opening and closing operations of the insulating tube. By providing a notched cylindrical shape with a recess that is non-rotatably engaged and a connecting pin, which is hung on the lower adapter electrode, the protective cover can be attached and detached from the current limiting fuse live part extremely easily. This also has the effect of eliminating the troublesome work of removing the current limiting fuses one by one when opening and closing them.

[Brief explanation of the drawing]

Fig. 1 is a front view of a cut-out switch embodying an embodiment of the present invention, Fig. 2 is a vertical cross-sectional view showing the closed circuit state of the load switching device installed in the upper support insulator, and Fig. 3 is also an open circuit diagram. Fig. 4 is an enlarged plan view of the vicinity of the upper adapter electrode, Fig. 5 is an enlarged exploded perspective view, and Fig. 6 is an enlarged cross-section of the closed circuit state showing the mounting structure of the lower end live part of the current limiting fuse. FIG. 7 is an enlarged cross-sectional view in the open state, and FIG. 8 is an enlarged exploded perspective view of the vicinity of the lower adapter electrode.

Claims (1)

[Claims for Utility Model Registration] 1. An insulating tube provided with upper and lower adapter electrodes each having a current-limiting fuse built into the main body insulator via a support member and contact blades protruding from both ends, is connected to the lower adapter. In a cut-out switch that is rotatably attached to an electrode with a connecting pin having a notched surface, the protective cover covering the outside of the lower adapter electrode is configured to follow the opening and closing operation of the insulating tube. The protective cover is provided with a notched cylindrical connecting pin having a recess that engages removably and non-rotatably with the notched surface of the connecting pin of the lower adapter electrode, and is hung on the lower adapter electrode. A protective cover mounting structure for the live part of a cut-out switch. 2. The protective cover is formed by a pair of side plates and an arcuate plate integrally formed between the outer arcuate edges of the side plates. Protective cover mounting structure.