JP7321821B2 - fuse element protector - Google Patents

Description

The present invention relates to a protective component for a fuse element installed in a heating device, a circuit board, or the like, and more particularly to a component that can be easily and reliably attached.

2. Description of the Related Art Conventionally, in order to prevent excessive temperature rise in heating devices, deicing devices, or devices that generate heat such as circuit boards and secondary batteries, a fuse element has been used to cut off current when a predetermined temperature is reached. is installed (see Patent Document 1, for example). A protector is sometimes installed to the fuse element for the purpose of improving positioning accuracy and protecting it from external forces during assembly (see, for example, Patent Document 2).

JP 2017-185896: Toyota Motor Japanese Unexamined Patent Publication No. 2001-35333: Uchihashi Estech

However, the protector as disclosed in Patent Document 2 simply forms a fitting hole having the same shape as the fuse element and inserts a fuse block into the fitting hole. In order to fix the fuse element, separately prepared adhesive, adhesive tape, and shrink tube are used.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuse element protector which can be mounted easily and reliably.

In order to achieve the above object, the present invention provides a fuse element protector for a fuse element, comprising a hole into which the element body of the fuse element is inserted and two lead wires of the fuse element into which are inserted respectively. The groove is formed so as to communicate the hole with the peripheral edge of the fuse element protector, and the inner wall of the hole is formed to hold the element main body. It is characterized in that three or more protrusions are formed.
Further, it is conceivable that the fuse element is of an axial type and the two grooves are formed on a straight line.
Further, when a line connecting the two grooves formed on the same straight line is used as a reference line, it is conceivable that the protrusions do not overlap at positions facing the reference line.
Further, when it is assumed that the number of the convex portions is an odd number and the convex portions are moved parallel to the reference line, the convex portions are arranged at approximately equal intervals, and the convex portions facing each other on the reference line are arranged in a staggered manner.
In addition, when a line connecting the two grooves formed on the same straight line in the hole is defined as a reference line, and the hole is partitioned by the reference line, It is conceivable that the thickness of the wall near the protrusion is thicker than the thickness of the wall near the protrusion in the section on the side with fewer protrusions.

According to the present invention, it is possible to mount the protector by a simple process of only fitting the element body into the hole and the lead wire into the groove. Moreover, since three or more protrusions are formed, the element body of the fuse element can be securely held.

1 is a perspective view of a fuse element protector according to the present invention; FIG. FIG. 4 is a perspective view of another side of a fuse element protector in accordance with the present invention; 1 is a perspective view showing a state in which a fuse element protector according to the present invention is attached to a fuse element; FIG. 1 is a plan view of a fuse element protector according to the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, Embodiment 1 will be described with reference to FIGS. 1 and 2. FIG. The fuse element protector 10 is made of polycarbonate resin and has a substantially plate shape of 5 mm long, 18 mm wide and 1.9 mm thick. The fuse element protector 10 is formed with a hole 11 having a major diameter of 10 mm and a minor diameter of 2.6 mm so as to penetrate both main surfaces. Three projections 13a, 13b, and 13c are formed on the inner wall of the hole 11 so as to protrude by 0.6 mm. As shown in FIG. 1, two grooves 12a and 12b each having a width of 1 mm and a depth of 1.5 mm are provided on one main surface of the fuse element protector 10 so that the hole 11 and the peripheral edge of the fuse element protector 10 communicate with each other. is formed. The two grooves 12a and 12b are formed on a straight line.

Such a fuse element protector 10 is attached to the fuse element 20 as shown in FIG. The fuse element 20 is of an axial type, and has a structure in which a pair of electrodes 22a and 22b with a diameter of 0.6 mm are led out in a straight line from both ends of a substantially cylindrical element body 21 with a length of 8 mm and a diameter of 1.65 mm. It's becoming The fuse element protector 10 according to the present embodiment has a configuration corresponding to the shape of such an axial type fuse element 20 . An element body 21 of the fuse element 20 is placed in the hole 11 of the fuse element protector 10 and held by the three projections 13a, 13b and 13c. Lead wires 22 a and 22 b of fuse element 20 are fitted into grooves 12 a and 12 b of fuse element protector 10 .

As shown in FIG. 4, when a line connecting the two grooves 12a and 12b formed on the same straight line is defined as a reference line L (indicated by a chain line in FIG. 4), None of the three protrusions 13a, 13b, and 13c overlap in position. Also, assuming that the three convex portions 13a, 13b, and 13c are moved parallel to the reference line L as indicated by the arrows in FIG. The convex portions 13a, 13c and the convex portion 13b, which face each other on the reference line L, are arranged in a staggered manner. As a result, excessive pressure is not applied to the element body 21 when the element body 21 is gripped by the protrusions 13a, 13b, and 13c, and the element body 21 can be stably held without being damaged.

Further, when the hole portion 11 is partitioned by the reference line L, the thickness of the wall 14a near the convex portion in the partition on the side with the larger number of convex portions is the same as the thickness of the wall 14a near the convex portion in the partition on the side with the smaller number of convex portions. It is thicker than the thickness of 14b. More specifically, the thickness of the wall 14a near the protrusion in the section 11a in which the two protrusions 13a and 13c are formed is 1.2 mm. The thickness of the wall 14b is 0.6 mm. In this way, by reducing the thickness of the walls near the protrusions in the section on the side with fewer protrusions, the walls on the side with fewer protrusions are more likely to flex, facilitating the arrangement of the element body. At the same time, excessive pressure on the element body can be relieved.

The fuse element protector 10 is attached to the fuse element 20 as described above. Even in this state alone, the fuse element 20 is sufficiently held and fixed, but for more secure fixation, the fuse element protector 10 may fill and fix the gaps between the fuse elements 20 with an adhesive or the like. It is also conceivable to attach the fuse element protector 10 to the place where the fuse element 20 is arranged with an adhesive tape or an adhesive.

The present invention is not limited to the above embodiments. For example, the lead wires 22a and 22b of the fuse element 20 may be of a radial type instead of an axial type. In that case, the fuse element protector is formed with two parallel grooves. Also, the fuse element may be a power fuse instead of a thermal fuse. Furthermore, it can be applied to circuit elements such as resistors, inductors, capacitors, diodes, and transistors, instead of fuse elements.

The material of the fuse element protector 10 may be appropriately designed according to the environment in which it is used. Examples thereof include resin materials such as polycarbonate resins, polyester resins, polyethylene resins, polyurethane resins, acrylic resins, epoxy resins, polyamide resins, fluorine resins, thermoplastic elastomers, various rubber materials, and ceramics. Also, the outer diameter of the fuse element protector 10, the size and shape of the hole 11, the dimensions of the groove 12a and the like, and the dimensions and shape of the projection 13a may be appropriately designed according to the shape and size of the fuse element. Also, a rib or the like for reinforcement may be formed.

The hole 11 may not only penetrate through both main surfaces, but may also be open on one main surface and sealed on one main surface. The point is that the dimensions and shape should be such that the element main body 21 can be sufficiently accommodated therein.

The number of protrusions is not limited to three as in the embodiment. Three or more may be sufficient, but in the case where convex portions facing each other along the reference line L are arranged in a staggered manner as in the embodiment, an odd number is preferable for uniform pressure.

As described in detail above, according to the present invention, it is possible to obtain a fuse element protector that can be mounted easily and reliably. Such a fuse element protector can be used for fuse elements such as thermal fuses and power fuses, and circuit elements such as resistors, inductors, capacitors, diodes and transistors. In addition, fuse elements equipped with such fuse element protectors can be used, for example, in domestic heating appliances, automobile interior heating devices, industrial heating devices, various snow and ice removal devices, anti-fogging devices, heating cookers, and heat treatment machines. or a heat generating device such as a circuit board or a secondary battery.

10 fuse element protector 11 holes 12a, 12b grooves 13a, 13b, 13c projections 14a, 14b wall 20 fuse element 21 element body 22 lead wire

Claims (2)

A fuse element protector for an axial type fuse element,
a hole into which the element body of the fuse element is inserted;
having two grooves into which the two lead wires of the fuse element are respectively fitted;
The groove is formed so as to communicate the hole with the peripheral portion of the fuse element protector, and the two grooves are formed on a straight line,
three or more protrusions for holding the element body are formed on the inner wall of the hole,
The number of the protrusions is an odd number, and a line connecting the two grooves formed on the same straight line is set as a reference line. A fuse element protector, wherein the projections are arranged at substantially equal intervals, and the projections facing each other on the reference line are arranged in a staggered manner. A fuse element protector for an axial type fuse element,
a hole into which the element body of the fuse element is inserted;
having two grooves into which the two lead wires of the fuse element are respectively fitted;
The groove is formed so as to communicate the hole with the peripheral portion of the fuse element protector, and the two grooves are formed on a straight line,
three or more protrusions for holding the element body are formed on the inner wall of the hole,
A line connecting the two grooves formed on the same straight line in the hole is defined as a reference line, and when the hole is partitioned by the reference line, the protrusions in the partition on the side where the number of protrusions is large A fuse element protector as claimed in claim 1, wherein the thickness of the wall in the vicinity thereof is thicker than the thickness of the wall in the vicinity of the protrusions in the section on the side having fewer protrusions.

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