JPH039577B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a vacuum fuse device in which a vacuum fuse and a display fuse for displaying the blow-off operation state of the fuse are arranged in parallel.

Purpose In recent years, with the increase in power demand, the capacity of power distribution lines has been increasing, and the equipment that protects them is also required to have even higher performance.

Currently, current-limiting fuses are widely known as fuses for protecting high-voltage circuits and equipment, especially from short-circuit currents, but in order to achieve high reliability with increased capacity, the size of the fuse itself has to be increased. There is.

Therefore, the present invention uses a vacuum fuse with high insulation recovery characteristics to provide a highly reliable vacuum fuse that has little aging deterioration of the fuse element and can always be disconnected after the element has blown out. In addition to miniaturizing the vacuum fuse itself, due to the structure of the vacuum fuse, it is difficult to incorporate the fuse and the operation display section when the fuse is blown, so the display fuse is integrated into the vacuum fuse via the electrode support section of the vacuum fuse. It is an object of the present invention to provide a vacuum fuse device that can accurately indicate whether the vacuum fuse is broken or broken by arranging the vacuum fuses in parallel.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 11.

Reference numeral 1 denotes a base, on the top of which a mountain-shaped mounting slope 1a is formed, and a pair of supporting insulators 2 are mounted and fixed to the mounting slope 1a by bolts 3 so as to form a V-shape with each other. There is. Reference numeral 4 denotes a terminal block that is symmetrically provided at the upper end of each support insulator 2, facing each other, and is connected to the support insulator 2 by a mounting portion 4b having an inverted T-shaped cross section and integrally provided at the lower part of the terminal block. Five bolts are attached, the upper surface of which is horizontal, and one end of which extends outward. Note that 4a is a through hole provided in the terminal block 4. 6
1 shows a pair of vacuum fuse attachment devices provided on the upper surface of each terminal block 4 so as to correspond to each other.

Reference numeral 7 denotes a support member as an electrode support portion of the mounting device 6, which integrally protrudes upward from the upper surface of each terminal block 4, and has a insertion groove 8 on its upper end surface extending in the left-right direction in FIG. A notch is formed from above so that an electrode Aa of a vacuum fuse A, which will be described later, can be inserted therein (see FIG. 4). 9 is the support member 7
A pressing member rotatably mounted on a shaft 10 so as to be able to open and close the upper part of the insertion groove 8 on one side upper part,
The electrode of the vacuum fuse A is such that its tip can be locked to the upper part of the corresponding other side via the insertion groove 8, and is inserted into the insertion groove 8 until it is locked to the upper part of the other side. It is now possible to press Aa. and,
The pressing member 9 and the insertion groove 8 constitute the vacuum fuse mounting device 6 described above. Further, the pressing member 9 has a locking portion 11 bent obliquely upward at its distal end, and a cutout groove 12 extending toward the proximal end at the center of the distal end.

Reference numeral 13 denotes a notch groove formed in the center of the upper part of the other side of the support member 7, and corresponds to the notch groove 12 of the pressing member 9. Reference numeral 14 denotes a rotation shaft rotatably supported on the other side of the support member so as to pass through the notch groove 13.

15 is a rotation shaft 14 corresponding to the notch groove 13;
It is a press bolt screwed into the center part of the press member 9 so as to be reciprocally movable, and can be inserted into the notch groove 12 of the press member 9 that covers the upper part of the insertion groove 8, as shown in FIG. , when it is screwed into the rotation shaft 14 while being engaged in the notch groove 12, its head will be pressed against the pressing member 9.
It has become possible to press the Note that the pressing bolt 15 is configured to be prevented from moving in the direction of the arrow Q in FIG. 3 by the locking portion 11 of the pressing member 9 when the pressing member 9 is pressed and held as described above.

Regarding the vacuum fuse A attached to the attachment device 6, electrodes Aa are hermetically inserted through both ends of an insulator tube 16 formed of ceramic or the like into a cylindrical shape, and are opposed to each other. 7th
As shown in the figure, 17 is a slit cut in the inner end of the electrode Aa in the radial direction, 18 is a conductive plate connected to the electrode Aa, and the central arm 19 is inserted into the slit 17. It is fixed by being worn. The conductive plate 18 has spiral portions 20 extending concentrically from both ends of the arm portion 19 to form a double spiral configuration, with corresponding spiral portions 20 extending concentrically from both ends of the arm portion 19.
A spacer 21 made of a high resistance material such as stainless steel is tightly inserted between the two.

Reference numeral 22 denotes a cylindrical arc runner with a bottom that covers the conductor plate 18, and is fitted and inserted into the outer circumferential portion of the conductor plate and brazed thereto. A fuse element 23 has both ends loosely inserted into the center of each arc runner 22 and inserted into the end face of the electrode Aa and the center of the arm 19 of the conductor plate 18.

Therefore, when assembling this vacuum fuse, conductor plate 1
8 and electrode Aa are prevented from rotating, and
Stable brazing is possible, and the spiral portion 20 of the conductor plate 18 moves toward the outer circumferential side of the arc runner 22, so that when the fuse element 23 is fused and an arc is generated, the arc is transferred to the arc runner 22.
The arc runner 22 is spread uniformly over the entire surface of the arc runner 22 without being confined in the center of the arc runner 22, so that the arc runner 22 can be used effectively.

Reference numeral 24 designates a display fuse mounting holder as a bifurcated conductive mounting portion fixed to the lower surface of one side of each support member 7 by rivets or the like. The display fuse 25 detachably attached to the mounting holder 24 is electrically connected to the vacuum fuse A in parallel while being spaced apart from each other.

To explain the display fuse 25, 26
27 is a cap-shaped electrode that is fitted and fixed to one end of the insulating tube 26; 28 is a resistance wire whose one end is connected to the electrode 27; It is formed in the shape of

A cap-shaped electrode 29 is fitted onto the other end of the insulating tube 26 and fixed with adhesive, and a display tube insertion hole 30 is provided in the center thereof. Same insertion hole 3
A conductive metal display tube 31 whose inner end is housed in the insulating tube 26 is inserted into the insertion hole 30.
The peripheral outer surface of the display tube 31 is electrically connected by soldering or the like while being locked at the locking flange portion 31a at the outer end of the display tube 31.

Reference numeral 32 denotes a coil spring housed in the display tube 31, and its inner end includes a protrusion 33 formed on the inner periphery of the inner end of the display tube 31 and a protrusion formed by caulking from the protrusion 33 toward the outer end. It is fixed immovably between the parts 34. Reference numeral 35 denotes a display piece installed inside the display tube 31, which is a disc-shaped display plate 35a.
and a locking piece 35b formed integrally with the display plate 35a and bent inward into an L-shape. The locking piece 35b is a coil spring 3.
It has a width that is the same as the inner diameter of No. 2, and locking protrusions 35c are formed on both side edges of the proximal end thereof. Then, when the display piece 35 rotates and inserts the locking piece 35b into the outer end of the coil spring 32, the locking protrusion 35c is engaged between the pitches of the spring 32 (see FIG. 10), and the coil spring 35 is inserted. 3
It is attached to prevent it from coming off from 2.

Reference numeral 36 denotes an insulating cover fitted to the inner end of the display tube 31, which has a through hole 37 in its center and a recess 36a cut into its outer periphery. Reference numeral 38 is a cylindrical copper caulking member through which the other end of the resistance wire 28 and one end of the display wire 39 are inserted and caulked together, and is locked to the inner end surface of the insulating lid 36. ing. The display line 39 extends through the through hole 37 of the insulating cover 36, and further extends through the coil spring 32.
The display piece 35 is inserted through the locking piece 35b so that the display piece 35 is sunk into the display tube 31 while resisting the urging force of the display cylinder 31. After insertion, the other end of the display line 39 is reversed and extended to the outside of the display tube 31 via the recess 36a of the insulating lid 36 and the inner circumference of the display tube 31, and a notch is formed at the inner end of the display tube 31. It is wound around the notched portion 31b. Note that after the display line 39 is wound, the notch 31b is caulked in the direction of the arrow in FIG.
The outer end surface and the recess 36a are filled with a sealant 41 such as epoxy resin to seal the inner end of the display tube 31 in a watertight manner.

Therefore, this display fuse 25 is electrically connected in the order of electrode 27→resistance wire 28→display line 39→display tube 38→electrode 29. Note that 40 is arc-extinguishing sand filled in the insulating cylinder 26. That is, the display fuse 25 itself has a current limiting effect.

To attach the vacuum fuse A constructed as described above to a vacuum fuse attachment device, the vacuum fuse A must be mounted with the pressing member 9 and the pressing bolt 15 separated from each other as shown by the chain lines in FIG. The electrode Aa is inserted into the insertion groove 8 of the support member 7.
Thereafter, the pressing member 9 is rotated in the direction of arrow P in FIG. 3, and the pressing bolt 15 is rotated in the direction of arrow Q opposite to that of FIG.

Next, by screwing the pressing bolt 15 into the rotating shaft 14, the tip of the pressing member 9 is pressed through the head of the pressing bolt 15, thereby creating a vacuum in the pressing member 9 and the insertion groove 8. Fix the vacuum fuse A to the mounting device 6 while making close contact between the electrode Aa of the fuse A and the electrode Aa and the support member 7 (third
(see figure).

Now, in the vacuum fuse device configured as described above, when an overcurrent flows through the attached vacuum fuse and the internal fuse element 23 is blown, the display fuse 25 connected in parallel with the vacuum fuse A A current flows through, and the internal resistance wire 28 and display wire 39 are fused. When the indicator wire 39 is fused, the stored coil spring 32 is released and the indicator piece 35 is moved to project outward, indicating that the vacuum fuse A is shutting off.

Therefore, vacuum fuse A and display fuse 2
5, since each fuse element is reliably blown when separated from each other, there is no risk of adversely affecting the breaking performance of the vacuum fuse, and the breaking of the vacuum fuse can be accurately indicated. Therefore, it can be easily recognized from the outside. Since the display fuse 25 itself also has a current limiting effect, it is advantageous as a fuse device.

The terminal block 4 also includes a mounting portion 4b for mounting to the support insulator, and a support member 7 for supporting the vacuum fuse A.
Since it is integrated, assembly can be simplified and the number of parts used can be reduced.

Furthermore, since the display fuse 25 is configured to have both end electrode parts supported by the mounting holder 24 at a position below the vacuum fuse A which supports the electrode Aa by the mounting device 6, the display fuse 25 is larger than the large diameter part of the vacuum fuse A. It does not protrude outward and can be installed to make effective use of space.

Effects As described above, the present invention provides a terminal block in which an electrode support portion is integrally provided at each upper end of a pair of support insulators that protrude from the base in a V-shape. A vacuum fuse is removably supported between attachment devices arranged opposite to each other and provided on the upper part of the electrode support part, and is spaced apart from the installation position of the attachment device on the side of the electrode support part. By providing a mounting part that supports the electrodes at both ends of the display fuse in electrical parallel with the vacuum fuse, all fusing and crinkling occur in a vacuum, resulting in a compact size, long life, and long-lasting coverage. Vacuum fuses with excellent breaking and safety features provide high reliability for increasing the capacity of power distribution lines, and display fuses that are integrally placed in parallel with the vacuum fuses can be used to quickly break the vacuum fuses. The status can be displayed accurately, and since the electrode support section, which has a mounting device for supporting the vacuum fuse and a mounting section for supporting the display fuse, is integrated into the terminal block, equipment assembly can be simplified. The number of parts used can be reduced, and a mounting device for supporting the vacuum fuse is provided with a fitting groove for supporting the electrode of the vacuum fuse and a pressing member for pressing the electrode of the vacuum fuse into the fitting groove. By adopting a configuration including the above, the vacuum fuse can be easily and reliably attached to and detached from the device. In addition, since the display fuse is installed at a location that is separate from the vacuum fuse with respect to the electrode support, there is no risk of adversely affecting the vacuum fuse's breaking performance, and the disconnection status of the vacuum fuse can be easily monitored. The display fuse, which can be easily checked and whose electrodes at both ends are supported by the mounting part, is not likely to be placed outside the large diameter part of the vacuum fuse, making the overall space of the device more efficient. can be used,
Furthermore, it is smaller than a power fuse and has the effect of having high reliability, making it an excellent invention for industrial use.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4 is a perspective view of the mounting device, and Fig. 5 is a fuse of the vacuum fuse. 6 is a sectional view taken along the line A-A in FIG. 5, and FIG. 7 is a perspective view of the inner end surface of the electrode of the vacuum fuse.
Fig. 8 is a half-sectional view of the display fuse, Fig. 9 is a sectional view of the indicator cylinder, Fig. 10 is a sectional view of the main part showing how the indicator piece is attached, and Fig. 11 is the insulating cover and the inner end of the indicator cylinder. FIG. 1...Base, 2...Support insulator, 4...Terminal block,
6...Mounting device, 7...Support member as an electrode support section, 8...Putting groove, 9...Press member, 24...
Mounting holder as a mounting part, 25...display fuse, A...vacuum fuse, Aa...electrode.

Claims (1)

[Scope of Claims] 1. A terminal block 4 having an electrode support part 7 integrally provided at each upper end of a pair of support insulators 2 projecting from the base 1 in a V-shape is supported by both electrodes. The upper part of the electrode support part 7 has a insertion groove 8 for supporting the electrode Aa of the vacuum fuse A, and the electrode Aa of the vacuum fuse A is placed in the insertion groove 8. A mounting device 6 is provided with a pressing member 9 that presses both mounting devices 6.
A vacuum fuse A is removably supported therebetween, and a display fuse is provided in electrical parallel with the vacuum fuse A at a position apart from the installation position of the mounting device 6 on the side of the electrode support part 7. 1. A vacuum fuse device characterized in that a mounting portion 24 is provided to support electrode portions at both ends of the electrode portion 25.