JP3192204B2 - Connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for connecting, for example, a sheath-type thermocouple to a compensating conductor.

[0002]

2. Description of the Related Art A sheath-type thermocouple can be miniaturized and is widely used for temperature measurement. The sheath-type thermocouple is used by being connected to a measuring circuit via a compensating wire, and transmits measured temperature information to the measuring circuit via a compensating lead.

[0003] A sheath-type thermocouple and a compensating lead are connected in the following configuration.

[0004] A sheath-type thermocouple is a thermocouple in which a pair of thermocouple elements is inserted into a sheath made of metal and filled with heat-resistant insulating powder. The end of the thermocouple element is led out of the sheath. The compensating lead wire has a pair of core wires inserted into the outer sheath, and the ends of the core wires are led out of the outer sheath.

[0005] The terminal of the thermocouple element and the core wire of the compensating conductor are connected by brazing. A metal sleeve is disposed around the connection between the thermocouple element and the core wire, and both ends of the sleeve are fixed to the outer tube of the sheath-type thermocouple and the outer tube of the conductor, respectively. The inside of the sleeve is filled with an insulating resin, and the connection between the thermocouple element and the core wire is buried inside the resin.

[0006]

In this conventional connection device, the outer tube of the sheath-type thermocouple and the outer tube of the compensating wire are not sufficiently fixed, and each of them may rotate around the axis.
When the outer tube of the sheath-type thermocouple and the outer tube of the compensating wire rotate around the axis, the thermocouple element of the sheath-type thermocouple and the core wire of the compensating wire are twisted, and the thermocouple element and the core wire come into contact and short-circuit. An accident may occur.

The present invention has been made in view of the above circumstances, and prevents the occurrence of a short circuit accident by preventing kinking of each connected object at a connection portion between a first connected object and a second connected object. It is an object of the present invention to provide a connection device that has been developed.

[0008]

In order to achieve the above object, a connecting device according to the present invention comprises a first connected member having a pair of core wires inserted through the inside of an outer cylinder. In a connection device for connecting a core wire and a core wire exposed from the outer cylinder in a second connected body formed by inserting a pair of core wires into an outer cylinder, the outer cylinder of the first connected body includes: A fixed body fixed to the outer cylinder of the second connected body, the fixed body having a receiving portion that suppresses rotation about the axis of each of the outer cylinders and has an open upper part; and the first connected body. And a sleeve arranged so as to surround a connecting portion between the core wire of the second connected body and the core wire of the second connected body and the fixed body, and an insulator filled in the sleeve.

In particular, the connection device of the present invention is optimally used for connecting a sheath-type thermocouple to a compensating lead.

[0010]

The rotation of the outer cylinder of the first connected body and the outer cylinder of the second connected body around the axis is suppressed by the fixed body, so that the core wires of the connected bodies are twisted and come into contact with each other. Without
Therefore, occurrence of a short circuit accident can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

This embodiment is applied to a structure in which a sheath-type thermocouple and a compensating lead are connected. FIG. 1 shows the whole of the connecting device.

In the figure, 1 is a sheath type thermocouple, and 2 is a compensating lead wire.

The sheath-type thermocouple 1 is formed by inserting a pair of thermocouple elements 4a and 4b into a sheath 3, which is an outer cylinder made of metal, and filling with a heat-resistant insulating powder 5. The ends of the pair elements 4a and 4b are led out from the open end of the sheath 3. The compensating lead wire 2 has an intermediate sheath 7 provided inside an outer sheath 6 which is an outer cylinder, and a pair of core wires 8a and 8b are inserted therein, so that a pair of core wires 8a and 8b are extended from the outer sheath 6 to the outside. Is exposed.

The sheath-type thermocouple 1 and the compensating conductor 2 are arranged on the same axis, and the ends of the pair of thermocouple elements 4a and 4b and the ends of the pair of core wires 8a and 8b face each other, so that the brazing material 9 is formed. Brazed using. In this case, the terminals of the pair of thermocouple elements 4a, 4b and the adjacent terminals of the pair of core wires 8a, 8b are spaced apart in the diameter direction so as not to contact each other.

Numeral 10 denotes a fixed body, as shown in FIG. 3, which has a T-shape having a portion 10a and a portion 10b which is combined with one end of the portion 10a at right angles thereto. The portion 10a has a length necessary for connecting the sheath-type thermocouple 1 and the compensating conductor 2, and both ends are bent and erected along a folding line (imaginary line) shown in FIG. The portion 10a is disposed between the sheath 3 of the sheath-type thermocouple 1 and the outer sheath 6 of the compensating lead wire 2, and the other end is fixed to the sheath 3 of the sheath-type thermocouple 1 by brazing with a brazing material 11. Have been. Therefore, the sheath 3 of the sheath-type thermocouple 1 is fixed to the fixed body 10 so as not to rotate around the axis.

The portion 10b has a length necessary to surround and fix the outer sheath 6 of the compensating conductor 2, and is formed in a circular shape so as to surround the outer sheath 6 of the compensating conductor 2, and both ends are protruded. The outer cover 6 is held together and fixed to this. For this reason, the outer covering 6 of the compensating conductor 2 is
It is fixed so as not to rotate around the axis with respect to 0.

Further, side walls 10c are formed on both sides of the portion 10a of the fixed body 10, respectively. The pair of side wall portions 10c are bent and erected along a bending line (virtual line) when both ends of the portion 10a are bent and erected. For this reason, a box-shaped resin receiving portion having an open top is formed by the portion 10a and the side wall portion 10c.

When connecting the sheath-type thermocouple 1 and the compensating conductor 2, the thermocouple elements 4a, 4b and the core wires 8a, 8
Before placing the sleeve 12 around the connection of FIG.
As shown in the figure, the connection between the thermocouple elements 4a and 4b and the core wires 8a and 8b is embedded in a thermosetting resin 16 having an insulating property. That is, the resin 16 is put into the resin receiving portion of the fixed body 10 in a softened state, and is raised to be cured while surrounding the connection portion between the thermocouple elements 4a, 4b and the core wires 8a, 8b. In this case, since the resin 16 surrounding the connecting portion is received by the box-shaped resin receiving portion having an open upper portion formed by the portion 10a of the fixed body 10 and the side wall portion 10c,
The softened resin does not flow downward from the connection portion, and the state where the entire connection portion is embedded in the resin 16 is ensured.

Thus, the thermocouple elements 4a and 4b and the core wire 8
After molding the connection portion between the thermocouple elements 4a and 4b and the core wires 8a and 8b as shown in FIG.
The sleeve 12 is arranged around the connection portion of
Is filled with a resin 15. The resin 15 is filled in portions other than the resin 16.

The sleeve 12 made of metal has a cylindrical shape having an inner diameter larger than that of the sheath 3 of the sheath-type thermocouple 1 and the outer coating 6 of the compensating lead wire 2. One end is opened and the other end is provided with a sheath insertion hole 13. It is formed along the central axis.
The sleeve 12 is arranged so as to concentrically surround the connection between the sheath-type thermocouple 1 and the compensating conductor 2 around the central axis of these members, and the sheath-type thermocouple 1 is inserted into the sheath insertion hole 13.
Of the sheath 3 is inserted. The sleeve 12 is brazed to the sheath 3 of the sheath-type thermocouple 1 with a brazing material 14.

The sleeve 12 is filled with a thermosetting resin 15 having an insulating property. That is, the resin 15 is hardened after being filled in the sleeve 12 in a softened state. The resin 15 fills the space inside the sleeve 12 except for the resin 16, and is fixed to the sheath 3 of the sheath-type thermocouple 1 and the outer coating 6 of the compensating conductor 2, and is fixed to the fixed body 10. Thereby, the sheath 3, the outer coating 6, the thermocouple elements 4a, 4b, the core wires 8a,
8b, the fixed body 10 and the sleeve 12 are integrally fixed.

In this manner, the sheath-type thermocouple 1 and the compensating lead 2 are fixed to the fixed body 10 in common so as not to rotate about the axis, and the sheath-type thermocouple 1 and the compensating lead 2 are respectively fixed to the other. Rotation about the axis can be prevented. For this reason, the sheath-type thermocouple 1 and the compensating lead wire 2 rotate about the axis, and the connection between one thermocouple element 4a and the core 8a and the connection between the other thermocouple element 4b and the core 8b. Can be prevented from being twisted and coming into contact with each other, and a short circuit between them can be prevented.

In this manner, the resin 15 filled in the sleeve 12 does not reach the connection between the thermocouple elements 4a, 4b and the core wires 8a, 8b, so that a so-called poor filling does not occur. Can be In the case where the filling failure occurs, a space surrounding the connecting portion is generated, and the connecting portions of the thermocouple elements 4a, 4b and the core wires 8a, 8b are not insulated from each other, and the connecting portions come into contact with each other to cause a short circuit accident. In some cases, moisture may enter the space from the outside, and the insulating property to the connection may be reduced. Therefore, as described above, the thermocouple elements 4a, 4b and the core wires 8a, 8b
Is connected to the resin 16 so that the connection does not come into contact with moisture.

The present invention is not limited to the configuration of the above embodiment, but can be implemented in various modifications.

[0026]

As described above, according to the connecting device of the present invention, the kinking of each connected body at the connecting portion between the first connected body and the second connected body is prevented, and the short circuit accident is prevented. Generation can be prevented, and it is particularly effective for connecting the sheath-type thermocouple to the compensating conductor.

This is particularly effective when an insulating material such as a resin having high viscosity and poor fluidity is used as the filler, and moisture absorption and short circuit due to poor filling can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state before a sleeve is arranged in a connection device according to an embodiment of the present invention.

FIG. 2 is an exemplary sectional view showing a state where a sleeve is arranged in the connection device of the embodiment;

FIG. 3 is an expanded view showing a fixed body used in the connection device of the embodiment.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1: sheath type thermocouple, 2: compensation lead wire, 3: sheath, 4:
Thermocouple element, 6: outer coating, 8: core wire, 10: fixed body,
15 ... resin, 16 ... resin.

Claims (2)

(57) [Claims] 1. A first connected body having a pair of core wires inserted through an outer cylinder, and a second core having a pair of core wires inserted through an outer cylinder in the first connected body. In the connection device for connecting the core wire exposed from the outer cylinder in the connected body, the outer cylinder of the first connected body and the outer cylinder of the second connected body are respectively fixed to the outer cylinder. A fixed body having a receiving portion that suppresses rotation about the axis of the cylinder and has an open top, a connecting portion between a core wire of the first connected body and a core wire of the second connected body, and A connection device, comprising: a sleeve disposed to surround a fixed body; and an insulator filled inside the sleeve. 2. The connection device according to claim 1, wherein one of the connected members is a sheath-type thermocouple, and the other connected member is a compensating lead.