JPH07201525A - Manufacture of high-temperature thermistor temperature sensor - Google Patents

Abstract

PURPOSE:To save material and to save processing time by a method wherein the connection of the stainless steel single wire for signal lead out of a thermistor element and the stainless steel twisted wire conductor of a sensor lead wire is conducted by plasma spot welding. CONSTITUTION:One end of the stainless steel single wire 3, to be used for signal lead out and housed in a sheath tube 4, is connected to the element electrode of a thermistor element, the other end of the single wire 3 is bent, and the welded side of the stainless steel twisted wire conductor 7 of a sensor lead wire 6 is provided on the welding metal jig 20 which is connected to a plasma spot welding electrode 19. Then, the bent part of the single wire 3 is provided on the edge part of the welded part of the conductor 7, and a welding electrode torch 22 for electric discharge is provided in the upper space of the bent part. The single wire 3 and the end part of the conductor 7 are melted and connected by plasma spot discharge in the state wherein microscopic loads 21a and 21b are added in the direction where the single wire 3 and the conductor 7 are butted with each other in a reducing gas atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature for detecting a high temperature of 500.degree. C. to 1000.degree. The present invention relates to a method for manufacturing a thermistor temperature sensor.

[0002]

2. Description of the Related Art Conventionally, a high temperature thermistor temperature sensor of this type has been manufactured by a manufacturing method as shown in FIGS. 5 and 6A and 6B.

In FIGS. 5 and 6A and 6B, one ends of stainless single wires 3a and 3b for signal extraction of the thermistor element 1 housed in the sheath tube 4 are attached to the element electrodes 2a and 2b of the thermistor element 1. Are welded 5a and 5b, respectively, and the sensor lead wires 6a and 6a are attached to the other ends of the stainless single wires 3a and 3b.
In order to connect 6b, the connectors 8a and 8b are superposed and resistance spot weldings 9a and 9b are respectively performed.
The stainless steel stranded conductors 7a and 7b of the sensor lead wires 6a and 6b are superposed on the upper part of b and are respectively resistance spot welded 9
It was a manufacturing method of electrically and mechanically connecting and fixing by performing c and 9d.

[0004]

In such a conventional structure, for connecting the stainless single wires 3a, 3b for extracting the signal of the thermistor element 1 and the stainless stranded wire conductors 7a, 7b of the sensor lead wires 6a, 6b. Requires the connectors 8a and 8b, and the stainless single wires 3a and 3b and the connector 8
The resistance spot welding of a and 8b and the resistance spot welding of the connectors 8a and 8b and the stainless stranded wire conductors 7a and 7b are required to be welded twice, resulting in a large loss in terms of member saving and processing time. Further, there is a problem in reliability due to the large number of welding connections.

Further, in the case of resistance spot welding connection of a wire rod, since the welded portion is spot welded, the peel strength is weak relative to the tensile strength of the welded portion, and welding is used for applications where the environment of vibration and impact such as automobiles is severe. There was a problem in reliability of disconnection.

The present invention solves such a problem. By omitting the connector and adopting a manufacturing method in which the number of welding connections is once, the member and processing time can be reduced and the welding connection can be achieved. The purpose is to improve the reliability of connection by reducing the number of times.

[0007]

In order to solve this problem, the present invention relates to connecting a stainless single wire for signal extraction of a thermistor element and a stainless stranded wire conductor of a sensor lead wire to a stainless single wire by plasma spot welding. This is a method of electrically and mechanically connecting and fixing by melting and connecting the welded end of the stainless stranded conductor.

[0008]

With this manufacturing method, the connector can be omitted, and the number of welding connections can be reduced to one, which can save members and processing time.

Further, the number of welding connections can be reduced to once, the reliability of the connection portion is improved by reducing the number of welding connections, and the welding side end portions of the stainless single wire and the stainless stranded wire conductor are melt-connected. It becomes possible to provide a high temperature thermistor temperature sensor in which the tensile strength / peeling strength of the welded part is increased and the reliability of the connection part is improved.

[0010]

1 and 2 are manufacturing process drawings of a high temperature thermistor temperature sensor according to an embodiment of the present invention, and FIG. 3 is a front view of a high temperature thermistor temperature sensor body according to an embodiment of the present invention. FIG. 4 is a half sectional view of a high temperature thermistor temperature sensor according to an embodiment of the present invention.

1 and 2, the thermistor element 1
5 is welded to the element electrode 2 of the stainless steel single wire 3 for signal extraction of the thermistor element 1 housed in the sheath tube 4.
And connect it to the other end of the stainless single wire 3 by bending 17
Then, the welding side of the stainless stranded wire conductor 7 of the sensor lead wire 6 is installed on the welding metal jig 20 connected to the plasma spot welding + electrode 19, and the end of the stainless stranded wire conductor 7 on the welding side is installed. The bent portion 17 of the stainless single wire 3 is installed in the above, the discharge welding-electrode torch 22 is installed in the space above the bent portion 17, and the reducing gas 2 such as nitrogen or argon is installed.
In the atmosphere of 3, the stainless single wire 3 and the stainless stranded wire conductor 7 are provided with an angle θ of 90 to 170 °, and the stainless single wire 3 and the stainless stranded wire conductor 7 are applied with minute loads 21a and 21b in the abutting direction. Is a manufacturing method of electrically and mechanically connecting and fixing the ends of the stainless single wire 3 and the stainless stranded wire conductor 7 by plasma spot discharge.

In FIG. 3, the element electrodes 2a and 2b of the thermistor element 1 are welded 5a and 5b to the stainless steel single wires 3a and 3b for signal extraction of the thermistor element 1 housed in the sheath tube 4, respectively. To connect the sensor lead wires 6a and 6b to the other ends of the 3a and 3b, the stainless stranded wire conductors 7a and 7 of the sensor lead wires 6a and 6b are connected.
b is melted and connected by plasma spot welding 10a and 10b, respectively, to electrically and mechanically connect and fix.

Further, in FIG. 4, in order to protect the thermistor element 1, a flange 12 and a nut 13 for fixing the sensor to the temperature-measuring object are provided to protect and insulate the plasma spot welding portion 10. A high temperature resistant rubber tube for protecting the heat resistant rubber bush 15 and the sensor lead wire 6 is provided, and the high temperature thermistor temperature sensor is configured by caulking and fixing the heat resistant metal collar 14.

[0014]

As described above, according to the present invention, the connector can be omitted, and the number of welding connections can be made once, so that it is possible to save members and processing time. It will be possible. In addition, it is possible to reduce the number of welding connections to once, improving the reliability of the connection part by reducing the number of welding connections, and by melting and connecting the welding side ends of the stainless single wire and the stainless stranded wire conductor It is intended to provide a high temperature thermistor temperature sensor having an increased tensile / peeling strength and improved reliability of a connection portion.

[Brief description of drawings]

FIG. 1 is a front view of one step showing an embodiment of a method for manufacturing a high temperature thermistor temperature sensor of the present invention.

FIG. 2 is an explanatory view of the welding connection process.

FIG. 3 is a front view of a high temperature thermistor temperature sensor body manufactured by the same method.

FIG. 4 is a half sectional front view of a high temperature thermistor temperature sensor manufactured by the same method.

FIG. 5 is a front view of a conventional high temperature thermistor temperature sensor during assembly.

FIG. 6 (a) is a front view after the assembling, and (b) is a plan view of the same.

[Explanation of symbols]

 1 Thermistor element 2a, 2b Element electrode 3a, 3b Stainless steel single wire 4 Sheath tube 5a, 5b Welded portion 6 Sensor lead wire 7a, 7b Stainless steel stranded wire conductor 10a, 10b Plasma spot welded portion 17 Stainless steel single wire bent 18 Plasma spot welding -Electrode 19 Plasma spot welding + Electrode 20 Welding metal jigs 21a, 21b Micro load 22 Welding-Electrode torch 23 Reducing gas

Claims (1)

[Claims] 1. When connecting a stainless single wire for signal extraction from a thermistor element electrode and a stainless stranded wire conductor of a sensor lead wire by welding, the welded end of the stainless single wire is bent to form a stainless stranded wire conductor. Welding + electrode is connected to the end of the welding side of, and the bent part of the end of the welding side of the stainless single wire is installed on the end of the stainless stranded wire conductor on the welding side in an electrically connected state. An electric discharge welding-electrode torch is installed in the upper space of the bent portion at the end of the welding side of the single wire, and 90 to 1 is applied to the stainless single wire and the stainless stranded wire conductor in a reducing gas atmosphere such as nitrogen or argon.
A high temperature thermistor temperature for welding a stainless single wire and a stainless stranded wire conductor by plasma spot discharge in a state where an angle of 70 ° is provided and a slight load is applied to the stainless single wire and the stainless stranded wire conductor in the direction of butting against each other. Sensor manufacturing method.