JP4131529B2 - Tube heat detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus capable of detecting abnormal heat generation during energization in a wire crimping tube that holds or connects an inserted wire by crimping.
[0002]
[Prior art]
It is known from Japanese Patent No. 270876 to use a shape memory alloy to detect abnormal heat generation due to energization of the crimping part. However, since all of the known ones are different in application object and completely different in shape from the present invention, they are not applicable to the object of the present invention.
[0003]
[Problems to be solved by the invention]
With regard to the compression tube for holding the insertion wire, a new structure using a shape memory alloy sensor must be created, but the following three points need to be taken into consideration.
First, even if the inside of the tube is hot, the surface layer is not necessarily so. Further, the branch line drawing direction end becomes particularly high temperature. Correspond to the above public facts.
Secondly, it is possible to prevent electric corrosion caused by foreign metal between the sensor and the electric wire.
Thirdly, it should be possible to attach to existing pipes as well as new pipes.
[0004]
[Means for Solving the Problems]
A strip-shaped body (sensor) made of a shape memory alloy is previously exposed on the inner surface of a short sleeve having a C-shaped cross section and attached in the axial direction with an appropriate length exposed. After inserting the electric wire into the tube, a C-shaped short sleeve is put on the end of the tube, and the three members of the electric wire, the tube, and the sleeve are crimped together. Since the sensor is sandwiched between the tube body and the short sleeve and is pressed near the open end of the tube body, the condition described in the first of the above problem is satisfied, and the sensor responds accurately to the internal temperature of the sleeve. To do.
Similarly, when attaching to an existing pipe body, a C-shaped short sleeve is put on the end, and it is compressed and attached with a crimping tool. A resin-based urethane paint is applied to the front of the sensor to facilitate remote viewing, and a tar epoxy paint is applied to the opposite surface between the sensor mounting base and the electric wire to prevent electrolytic corrosion.
[0005]
【Example】
An example of a jumper wire holding clamp will be described with reference to the drawings. As shown in FIG. 1, this clamp is integrally provided with a straight sleeve S and a jumper sleeve J, and electric wires E1 and E2 are inserted and crimped respectively. S and J in the same figure are those equipped with the apparatus of the present invention.
In the present invention, as shown in FIGS. 2 and 3, a sleeve having a shape memory alloy strip (hereinafter abbreviated as a sensor) 2 attached in the axial direction to a sleeve 1 having a C-shaped cross section is prepared in advance.
The case where this sleeve with a sensor is attached to the existing pipe is shown in the order of steps in FIGS. Since it is an existing tube, it is already hexagonal by crimping to the electric wire. Cover this with a sensor-equipped sleeve, press lightly to temporarily fix it, and finally press-fit in a shape that fits the previous hexagon to form a hexagon.
When crimping a new wire, the three members of the wire, the tube, and the sensor-attached sleeve are overlapped, and the sleeve 1 is positioned at the end of the tube (C or J) and crimped at once. .
FIG. 5 is a front view of a tension clamp in which a sensor coated with a resin-based paint is incorporated. When rainwater or the like accumulates in the gap between the sensor 2 and the electric wire E1 (E2) and is energized, the aluminum electric wire E and the Ni-Ti material sensor 2 are short-circuited, and the electric wire E corrodes due to a potential difference between different metals. To do. In particular, from the short sleeve 1 of the sensor mounting base 3 to each sleeve S (J), the surface of the electric wire facing the sensor 2 is easily eroded. In order to prevent this, a colored urethane paint 5 is applied to the front surface of the sensor, and a tar epoxy paint 6 having excellent weather resistance is applied to the mounting base 3 and the surface 4 facing the electric wire from above. As a result, the colored urethane paint surface faces outward, making it easy to detect from a distance, and facing the sensor cable from the short sleeve 1 to the sleeve of the sensor mounting base that is particularly susceptible to electroerosion. Since the tar epoxy paint 6 is applied to the surface, it is protected from electric corrosion and does not peel off.
[0006]
【The invention's effect】
Since the key points of the subject are accurately controlled, reliable detection can be performed. By using the two types of paint separately, it prevents electric corrosion and at the same time facilitates remote viewing.
[Brief description of the drawings]
FIG. 1 is an external view of a holding clamp to which a detection device of the present invention is attached.
FIG. 2 is a front view of the detection device of the present invention.
FIG. 3 is a side view of the detection device of the present invention.
FIG. 4 is an explanatory view of a mounting operation according to the present invention.
FIG. 5 is a front view of a detection device to which a resin-based paint is applied.
[Explanation of symbols]
S straight sleeve J jumper sleeve E1 main line E2 jumper line 1 C-type short sleeve 1a groove 2 shape memory alloy strip (sensor)
3 Mounting base 4 Sensor facing surface 5 Urethane paint 6 Tar epoxy paint

Claims (1)

An insertion hole of the wire at one end, in the tube which is energized wires after inserting crimp, the cross-section C-type short sleeves one end of the shape memory alloy strip-like body to the inner surface is affixed in the axial direction said tube made by compressing connected to one end of the body, the other end of the strip-shaped body said exposed from short sleeve, extending into the tube end the upper wire axially from the exposed portion of the strip-like body Is deformed so that it can be detected at a predetermined high temperature when energized, and tar epoxy paint is applied to the mounting base and the wire facing surface of this shape memory alloy strip, and urethane colored paint is applied to the opposite surface of the wire facing surface. heat generation detection device of the tubular body, characterized in that the.

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