JPH07134155A - Heat generation detecting device - Google Patents

Abstract

PURPOSE:To improve detecting performance and structural strength by bonding a thermal sensor body consisting of a shape memory alloy with a tie lap to be installed to a subject with an adhesive. CONSTITUTION:A thermal sensor body 6 is formed of a Ni-Ti shape memory alloy, and has shape memory parts 7 whose transformation temperatures are preset in two positions with a prescribed distance from a connecting part 11. A stainless tie lap 5 is installed to a subject by hooking a required one of a number of locking holes 12 provided on a tie metal at prescribed intervals to the hook of its buckle 4. A proper quantity of a two-liquid mixing type acrylic adhesive is first dropped onto the connecting part 11 by mixing and stirring the main agent with a hardener. The tie lap 5 is put on it orthogonally, and the sensor body 6 is firmly adhered to the tie lap 5. Thus, the shape memory parts 7 can be closely adhered to the subject, and detecting performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects abnormal heat generation in electric conductor connection portions, such as a straight line connection portion, a branch connection portion, a compression terminal portion, a connector portion, or a disconnecting switch, and the electric conductor itself in a train line. The present invention relates to a heat generation detection device installed in a connection portion of an electric conductor, an electric conductor, or the like.

[0002]

2. Description of the Related Art Recently, a heat generation detecting device 1 as shown in FIGS. 3 to 7 is sometimes attached to a connecting portion of an electric conductor or the like in order to detect heat generation abnormality. In this heat generation detecting device 1, for example, the ends of two feeders 2 are connected to a straight connecting pipe 3
It is used by attaching it to the connection part connected with. As shown in FIG. 4, the heat generation detecting device 1 is formed by mounting a heat sensor body 6 so as to be orthogonal to a generally used stainless tie wrap 5 with a buckle 4.

The heat sensor body 6 is made of a shape memory alloy formed in the shape of a long plate and has a stainless tie wrap 5 at the center thereof.
Shape memory alloy parts 7 are set on both sides of the joint part with. When the thermal sensor body 6 is heated to a predetermined temperature or more, it is bent from each shape memory portion 7 and deformed into an inverted U shape as shown by a broken line in FIG. Keep it.

Conventionally, the first means for connecting the heat sensor body 6 and the stainless tie wrap 5 is as follows:
There is one described in Japanese Patent No. 9210. This is a stainless steel thin plate sensor fixture 8 formed in a cruciform shape as illustrated in FIGS. 4 and 5. Two pairs of opposing projecting pieces of the sensor fixture 8 are provided for one of the thermal sensor body 6 and the other for the stainless tie wrap. There is a means to bend them so as to hold them, and to crimp them together.

Secondly, there is a coupling means described in Japanese Patent Application No. 1590/1990. As shown in FIG. 6, this is divided into two small projecting pieces by forming a slit in each projecting piece part of one side which is to be engaged with the stainless tie wrap 5 in the sensor fixing tool 9 formed in the shape of a cross. The two small protrusions are bent and fastened to the stainless tie wrap 5 so that the tips thereof overlap each other. Also, the other pair of projecting pieces of the sensor fixture 9 facing each other are bent and engaged so as to be wound around the thermal sensor body 6, and the thermal sensor body 6 and the stainless tie wrap 5 are attached.
Is a means of combining and.

Thirdly, the joining means described in Japanese Patent Application No. 1259/1989 is a means for joining by welding or brazing the joining portion with the stainless tie wrap.

Fourthly, there is a coupling means described in Japanese Patent Application No. Hei 1-2588. This is as shown in the seventh example.
It is a means for connecting the heat sensor body 6 and the stainless tie wrap 5 by winding and adhering the joint portion with the fixing body 10 made of copper tape. That is, the fixed body 10 is obtained by applying an adhesive to one side of a copper foil tape as an electromagnetic shield product, and further cutting a band-shaped shield tape formed by covering with a paper tape into a square having the tape width as one side.
Then, as shown in FIG. 7, the fixed body 10 is separately attached to the connecting portion from the front side and the back side. That is, a cut is made in each fixed body 10, the fixed body 10 attached to the thermal sensor body 6 winds the tie wrap 5, and the fixed body 10 attached to the tie wrap 5 forms the thermal sensor body. It is a means of connecting by winding.

Fifthly, a copper rivet is fitted into the hole formed in the central portion of the thermal sensor body 6 at the joint between the thermal sensor body 6 and the stainless tie wrap 5, and the thermal sensor body 6 is riveted to the stainless tie wrap 5. There is a means to fix with.

[0009]

In the conventional heat generation detecting device as described above, the heat sensor body and the tie wrap are connected by various means, but each means has the following problems. . First, in the first and second coupling means, the work of bending and attaching the sensor fixing tool, which is a stainless steel thin plate, requires skill and skill and a long processing time, which significantly increases the manufacturing cost of the device. There was a problem.

In the third joining means, the thermal sensor body 6 is made of a Ni-Ti type shape memory alloy in the joining process for joining the joint portion of the thermal sensor body 6 and the tie wrap 5 by spot welding or brazing. Therefore, bonding is considerably difficult in normal air, and the bonding strength becomes low. In addition, heat is transferred to the shape memory portion 7 of the thermal sensor body 6 during the joining process, and the thermal sensor body 6 starts to operate and deforms. Therefore, after the thermal sensor body 6 is cooled, the shape is returned to the original shape at room temperature. However, there is a problem in that it requires time and labor for processing, and the manufacturing cost of the device is significantly increased.

Next, in the fourth connecting means, in order to maintain the strength of the connecting portion, a fixing method is applied from the front and back sides of the fixing means, and a notch is formed in each of the fixing means, and the winding method is performed. . Therefore, according to this means, there is a problem that the manufacturing time is extended and the manufacturing price is increased.

Next, in the fifth joining means, since the head of the copper rivet fastened to the joining portion projects from the surface of the thermal sensor body 6, when the thermal sensor body 6 is attached to the object to be detected, the thermal sensor body is mounted. The shape memory part 7 of 6 is lifted from the object to be detected, and the contact of the thermal sensor body 6 with the object to be detected is hindered to deteriorate the performance of the heat generation detecting device. Further, the process of forming a hole for penetrating the copper rivet in the center of the thermal sensor body made of Ni-Ti-based shape memory alloy has a problem that the drilling cost is significantly increased because the material has extremely high hardness. there were.

The present invention has been made in view of the above points, and an object of the present invention is to newly provide a heat generation detecting device which is excellent in detection performance, has high structural strength, is easy to process and manufacture, and is inexpensive.

[0014]

SUMMARY OF THE INVENTION A heat generation detecting device of the present invention is a heat sensor body made of a shape memory alloy that recovers its shape by heat generation of a connecting portion of an electric conductor or an electric conductor, and an object to detect the heat generation. It is characterized in that the joint portion with the tie wrap to be mounted is joined by an adhesive.

[0015]

With the above-described structure, when abnormal heat is generated at the connection part of the electric conductor or the electric conductor in which this heat generation detecting device is installed, heat is generated by the shape recovery accompanying the transformation to the mother phase. The both ends of the sensor body return to their original shapes so as to be separated from the surface of the object whose heat is to be detected, and the sensor body rises, and it is possible to easily visually confirm the rising state and detect the heat generation state.

Further, the mechanical strength of the joint is remarkably high, and no protrusion is formed on the joint surface of the joint, so that the performance of the device is significantly improved as compared with the conventional one. Further, since the thermal sensor body and the tie wrap can be easily and quickly joined together, it is suitable for mass production and the manufacturing cost can be remarkably reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat generation detecting device of the present invention will be described below with reference to FIGS. 1 and 2
In FIG. 3, the parts corresponding to those of the conventional example shown in FIGS. 3 to 7 are designated by the same reference numerals, and detailed description thereof will be omitted. In the front view of FIG. 1 showing the apparatus of this example in an expanded manner,
1 is the main body of the heat detection device, 4 is a buckle, 5 is a stainless tie wrap, 6 is a thermal sensor body, 7 is a shape memory part, 1
1 is a connecting part.

The thermal sensor body 6 is a Ni--Ti type shape memory alloy, and has two shape memory portions 7 whose transformation temperatures are set in advance according to the purpose, at two locations spaced apart from the joint portion 11 by a predetermined distance.

The stainless tie wrap 5 is the same as the one generally used. The clasp of the buckle 4 is configured so that it can be easily attached to an object by hooking a required one of a plurality of fastening holes 12 formed in a band at a predetermined interval.

As shown in FIG. 2, a stainless tie wrap 5 is made to cross at the center of the thermal sensor body 6 in a cross shape, and these overlapping portions are bonded with an acrylic adhesive to form a joint portion 11.
And In this example, the bonding portion 11 is attached using a two-liquid mixing type acrylic adhesive composed of a main agent and a curing agent in the following procedure. First, an appropriate amount of acrylic adhesive obtained by mixing and stirring equal amounts of the main agent and the curing agent in advance is dropped at the position of the joint portion in the center of the back surface of the thermal sensor body 6. In this way, the portion of the stainless steel tie wrap 5 to be joined is gently placed so as to be orthogonal to the portion of the thermal sensor body 6 on which the adhesive is filled. Thus, as shown in FIG. 2, the joint portion 11 between the thermal sensor body 6 and the stainless tie wrap 5 is adhered by a thin film of adhesive, and excess adhesive wraps around the surface side of the stainless tie wrap 5 through the engaging holes 12. , To form a strong bridge and combine. The curing reaction of the acrylic adhesive composed of the main agent and the curing agent used here is completed within a few minutes. Therefore, this joining operation is extremely easy, and a large number of joining operations can be performed quickly. In this example, as the acrylic adhesive, a commercially available adhesive manufactured by ThreeBond Co. (trade name: ThreeBond 3920B / 3925B, ThreeBond 3921 /
3926, ThreeBond 3923/3928).

Next, the strength of the connecting portion 11 having the above-mentioned structure is
The experimental results compared with those of the conventional coupling means will be described. As a conventional coupling means, a copper tape fixing body which is mainly used in conventional products is used. As the strength of the bonded portion, the shear peel strength is taken into consideration. The measurement method was such that the stainless tie wrap 5 was fixed and a shear force was applied to both arms of the thermal sensor body 6 by using a spring balance (weighing 10 kg). At this time, the area of the joint is 54 m
It was set to m ² .

The experimental results are shown in Table 1. As a result, the adhesive peeling strength of the acrylic adhesive was 10 kgf / 54 mm ² or more in all cases, and the conventional product had 4.
It was found that the adhesive strength was remarkably high compared with the fact that the copper foil was broken at 5 kg / 54 mm ² .

[0023]

[Table 1]

Further, when the heat generation detecting device of this embodiment is mounted on the connecting portion of the electric conductor, as shown in FIG. It is assumed that different heat generation detecting devices 1 are attached and used, and are provided for the convenience of detection.

Further, looking at the performance of the apparatus of this example, since there is no protrusion due to the structure of the joint portion 11 on the surface of the thermal sensor body 6 that should contact the object with respect to the object whose heat is to be detected. In addition, the shape memory portion 7 does not rise, and the performance can be remarkably improved as compared with the conventional heat detecting device using the fixing means. It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the scope of the present invention.

[0026]

As described above in detail, in the heat generation detecting device of the present invention, since the joint portion where the heat sensor body and the tie wrap are orthogonal to each other is connected by using an adhesive, the following effects are obtained.

First, since the adhesive used for the joining portion is used in a small amount and the curing time is a short time which is commensurate with the manufacturing time, the total work is extremely easy as compared with the conventional manufacturing means. In addition, since it can be carried out quickly, it is possible to mass-produce the heat generation detecting device and significantly reduce the manufacturing cost.

Second, since the shear peel strength of the joint is high,
There is an effect that it is possible to eliminate the fear that the joint portion will be broken during normal handling of the heat generation detection device or during handling until the heat generation detection device is attached to the object to detect heat generation. In particular, in the case where the adhesive has an adhesive structure in which the adhesive wraps around from the adhesive surface side to the outside of the outer surface through the fastening holes of the tie wrap to form a bridge of the adhesive, the thermal sensor body and the tie wrap are Since the bonding force of the bridge portion is added to the adhesive force between the joint surfaces of 1), there is an effect that the strength of the coupling portion can be further increased.

Thirdly, when the heat detecting device is attached to the object to detect heat generation, no protrusion can be formed on the surface of the heat sensor body to contact with the object due to the structure of the joint portion. Makes good contact with the object. In particular, since the shape memory portion of the thermal sensor can be brought into close contact with the object, there is an effect that the performance can be remarkably improved as compared with the heat generation detecting device having the conventional configuration.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a heat generation detecting device of the present invention in a developed state.

FIG. 2 is a vertical cross-sectional view of a joint portion of the above embodiment.

FIG. 3 is a side view showing a state in which the heat generation detection device is attached to a connection portion of an electric conductor.

FIG. 4 is a front view illustrating a conventional heat generation detection device.

FIG. 5 is a perspective view of a main part illustrating a sensor fixture of a conventional heat generation detection device.

FIG. 6 is a perspective view of a main part illustrating another conventional sensor fixture.

FIG. 7 is a perspective view illustrating a fixed body of a conventional heat generation detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heat detection device 5 ... Stainless steel tie wrap 6 ... Thermal sensor body 7 ... Shape memory part 11 ... Coupling part 12 ... Locking hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Ito 2-1, 17 Osaki, Shinagawa-ku, Tokyo Inside the Meidensha Co., Ltd. (72) Inventor Kenyuki Nishizaki 2-1-1 17, Osaki, Shinagawa-ku, Tokyo Stock company Shameidensha

Claims (2)

[Claims] 1. A heat generation detecting device in which a heat sensor body made of a shape memory alloy that returns to a bent upright shape by a generated heat load is attached to a connection portion of an electric conductor or an electric conductor with a tie wrap, A heat generation detecting device, characterized in that a joint portion with the tie wrap is joined and fixed by an adhesive. 2. The heat generation device according to claim 1, wherein
When bonding and fixing the bonding portion with an acrylic adhesive, the heat sensor body and the tie wrap are bonded together, and the excess adhesive is passed through the fastening holes of the tie wrap to the surface side to form the surface. A heat detecting device, characterized in that a connecting portion is formed so as to form a strong bridge of the adhesive on the side.