JP3177715U - Fast-acting fuse - Google Patents

Abstract

An object of the present invention is to provide a long life even in an environment in which mechanical stress occurs by using a fusible element body in which a thin plate soluble body provided with fixing grooves is directly connected to a support plate of a heat-resistant insulating material by machining. A fast-acting fuse capable of holding
A formable soluble body of a good conductor metal comprising a rectangular thin plate having a total length of Lmm and a width of 1/2 Lmm, and having an extremely small narrow portion with an R at the center and U-shaped cutouts at both ends in the direction of the total length of Lmm. 3 is sandwiched from the front and back sides with a support plate 7 made of a heat-resistant insulating material having a total length of L ₀ mm and a width of 1/2 Lmm and having small holes at both ends. Furthermore, a fusible element body directly joined to the fusible body is formed by inserting and crushing and fixing the eyelets 8 in the small holes at both ends of the support plate 7, and this fusible element body is soldered between the double-edged terminals. After joining, the cylindrical container 2 was covered, these were fixed with the rivet 5, and after the arc extinguishing material 4 was filled inside, this was sealed with the screw plug 6, and the fast-acting fuse was comprised.
[Selection] Figure 6

Description

The present invention relates to an improvement in a fast-acting fuse used in an electric circuit under an environment such as vibration or impact.

Conventionally, fast-acting fuses have been used in limited environments due to the use of relatively weak fuse elements in environments where mechanical stresses such as vibration and shock are generated. It was used in a stationary state in a place that does not
However, due to technological innovation, the range of use has been expanded, and it has become an era background that must be dealt with in consideration of the departure from using it only in a stationary state, and there is a demand for a fast-acting fuse that satisfies the performance even in a dynamic state. It is getting more.

A fast-acting fuse is generally a very thin plate made of silver, copper, etc. between conductive metal fittings with relatively large capacities at both ends due to its structure, and a ribbon shape having a narrow part at the center is pressed with a precision mold. These fuse elements are arranged in a single unit or in parallel, and are covered with a cylindrical container, fixed with rivets, filled with an arc-extinguishing agent, and sealed with screws.

Such fast-acting fuses have no electrical or mechanical problems as long as they are used in a stationary state, but they can hardly cope with the mechanical stress that occurs under dynamic conditions. There wasn't.

For this reason, this type of fast-acting fuse is known as the fast-acting fuse of FIG. 3 using a reinforcing fuse element as shown in FIGS. 1 and 2 so that it can withstand mechanical stress even in a dynamic state. .

This will be described in detail with reference to the drawings as follows. 1 and 2 show a fuse element (a) formed by pressing a thin metal plate of silver or copper with a ribbon-shaped precision mold having a narrow portion (b) in the center, and this is composed of two heat resistant sheets. The narrow part (b) is squeezed from the front and back through the insulating resin plate (c), and the eyes (d) are inserted through the small holes (e) at the top and bottom of the heat-resistant insulating resin plate (c). A fast-acting fuse as shown in FIG. 3 was formed by using the reinforcing fuse element fixed in this manner.

However, although it was confirmed that the use of this reinforcing fuse element had a certain degree of life extension compared to the non-reinforcing one, it was found that it had the following problems over a longer period of use. did.
(1) The vertically and cross-shaped heat-resistant insulating resin plates are fixed by crushing the top and bottom of the fuse element, but this fixed part is contacted by friction with the arc extinguishing agent inside. In addition, the superposed heat-resistant insulating resin plates are loosened.
(2) This fixing method is repeated over time or over time because the heat-resistant insulating plate and the fuse element are indirectly integrated, that is, the fuse element is fixed without being provided with a connection portion. In use under dynamic environment such as vibration and impact, misalignment is likely to occur in the heat-resistant insulating resin that is superposed even by movement of the arc extinguishing agent inside, etc., bent to the central narrow part of the fuse element, Give deformation etc.
(3) The central narrow part of the fuse element is pressed with a very high precision mold in terms of dimensions, but since this part is not rounded, it is durable against mechanical stress (bending, deformation, etc.). Absent.
The present invention makes it possible to maintain a long life even in an environment where mechanical stress occurs by improving these drawbacks.

The present invention is a fast-acting fuse in which a thin plate fusible body is arranged between double-edged terminals in a cylindrical container and is filled with an arc-extinguishing agent. It consists of a rectangular thin plate with a total length of Lmm and a width of 1/2 Lmm. , With a very narrow narrow part with R at the center and a U-shaped cutout at both ends in the total length Lmm direction, a good conductor metal shaped fusible body with a total length of L ₀ mm and a width of 1/2 Lmm with small holes at both ends A support plate made of a heat-resistant insulating material is sandwiched between the front and back, and a small element at both ends of this support plate is inserted into the eyelets and crushed and fixed to form a soluble element body that is directly joined to the soluble body. This fusible element body is soldered between the double-edged terminals, covered with a cylindrical container, fixed with rivets and filled with an arc extinguishing material, and then sealed with a screw cap. The problem was solved by configuring the fuse. There.

Since the fusible element body in the cylindrical container does not have a protrusion in the vertical direction of the support plate, there is no displacement caused by the movement of the arc extinguishing material inside.

A perspective view of a fusible element structure used in a conventional fast-acting fuse. Another fusible body configuration perspective view used for a conventional fast-acting fuse Cross section of a conventional fast-acting fuse Configuration perspective view of fusible element body of fast-acting fuse of the present invention The perspective view of the fusible element body of the fast-acting fuse of the present invention Fast-acting fuse of the present invention

The fast-acting fuse in the present invention is mechanically robust because the fusible body and the support plate are directly integrated and joined by machining, and the width of the fusible body and the support plate is the same size, so vibration and impact Even when the arc-extinguishing agent moves inside due to the above, the moving state can be suppressed.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4, 5, and 6. FIG.
FIG. 4 is a perspective view showing the construction of a fusible body used in the fast-acting fuse of the present invention. In this figure, the fusible body 3 is a thin plate (thickness of 0.2 mm) of a good conductor metal such as silver or copper having a total length of Lmm and a width of 1/2 Lmm. 08-0.3mm) is manufactured by pressing with a precision mold. This die has a notched portion at the center narrow portion 3a and the U-shaped grooves 3b at both ends, and is manufactured in a state where the finish is not sharp after press working.
By bending these notches, bending, cracks, cracks, etc. that occur when some mechanical stress is applied to these portions can be reduced.

The support plate 7 made of a heat-resistant insulating material is rectangular with a total length of L ₀ mm and a width of 1/2 Lmm, and has a thickness of 2 mm or less, and is provided with small holes 7a through which the eyes 8 are inserted at both ends.

FIG. 5 is a perspective view of a fusible element body in which the fusible body 3 and the support plate 7 are mechanically integrated and joined. The fusible body 3 is supported by the support plate 7 coming into contact with the support plate 7 from the front and back. The small holes 7a at both ends of the plate 7 are overlapped and crushed and fixed. In this case, since the U-shaped grooves 3b and 3b at both ends of the fusible body 3 are the same size as or slightly larger than the diameter of the eyelet 8, the effect equivalent to the construction method in which the fusible body 3 is directly drilled and connected is effective. can get.

FIG. 6 shows a blade shape in which a surplus length L ₁ mm at both ends of the fusible element body configured in FIG. 5 is inserted into a groove (not shown) of the blade-shaped terminal 1 to which this is attached and joined by solder 9. The terminal is covered with a cylindrical container, and the rivets 5 are driven in a radial manner and fixed. Next, the arc-extinguishing agent is filled from the screw hole 1a of the blade-shaped terminal and sealed with the screw plug 6 to complete.

DESCRIPTION OF SYMBOLS 1 Edge terminal 2 Cylindrical container 3 Soluble element body 4 Arc-extinguishing agent 5 Rivet 6 Screw plug 7 Support plate 8 Heart 9 Solder

Claims (1)

A fast-acting fuse in which a thin plate fusible body is arranged between double-edged terminals in a cylindrical container and is filled with an arc extinguishing agent. The center portion consists of a rectangular thin plate having a total length of Lmm and a width of 1/2 Lmm. A heat-resistant insulating material having a small conductor with R and a good conductor with a U-shaped cutout at both ends in the total length Lmm direction, a total length L ₀ mm, a width 1/2 Lmm, and small holes at both ends Sandwiched from the front and back with a support plate made of, and inserted into the small holes at both ends of this support plate and crushed and fixed to form a soluble element body directly joined to the soluble body. A fast-acting fuse in which a fusion element is soldered between double-edged terminals, covered with a cylindrical container, fixed with rivets, filled with an arc extinguishing material, and sealed with a screw cap.

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