JPH0869904A - Formation of conjugation of thermistor and electric conductor of temperature sensor - Google Patents

Abstract

PURPOSE: To provide a simple and reliable method for forming a junction body which does not allow humidity to pass through between an electric conductive wire and a thermistor of a temperature sensor. CONSTITUTION: A conductive wire end part and a thermistor 4 in an end part thereof are coated by injection with a plastic material 5, which firmly adheres to a conductive wire coating material for electrically and mechanically jointing core lines 2 and 3 of a conductive line 1 and the thermistor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a moisture impermeable junction between a temperature sensor thermistor and an electrical conductor.

[0002]

BACKGROUND OF THE INVENTION In the field of temperature regulation and refrigeration and cooling systems, temperature sensors in evaporators and / or temperature regulated rooms require moisture-tight wired temperature sensors. Today, this kind of temperature sensor is embedded in a plastic sleeve. There is the problem that moisture must not penetrate into the area between the electrical conductor and the sensor case or implant in the plastic sleeve. Therefore, this type of bonded body generally does not have an airtight structure.

This difficulty cannot be satisfactorily solved without considerable expense, such as auxiliary application of shrink tubing or packing members or additional bonding of the joints.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple and reliable method for forming a moisture impermeable joint of the type described above.

[0005]

This object is achieved according to the invention by injection coating the end of the wire and the thermistor at this end with a plastic material which adheres tightly to the wire covering.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments and drawings.

As shown in FIG. 1, a thermistor 4 is electrically and mechanically attached to the core wires 2 and 3 protruding from the electric conductor wire 1. This mounting can be performed, for example, by brazing, welding, or shrinking the core wires 2 and 3 of the conductor wire and a connection terminal of the electrode or thermistor 4 not shown in the figure, which is stable against temperature changes.

The conductor 1 and the thermistor 4 thus formed
A unit consisting of the present invention is placed in an injection mold according to the invention and the area of the wire end and the thermistor 4 in this end area is injection coated with a plastic material 5, for example a thermoplastic material, which adheres tightly to the wire covering as shown. To do. In this way, a moisture-impermeable joined body of the sensor head formed of the plastic material 5 is formed at the end of the conductor in the range of the thermistor 4.

For example, the following materials have been found to be advantageous as a bonded body of the conductor coating material and the sensor head material. When the wire coating material is polyvinyl chloride,
Polybutylene terephthalic acid (P
BT) is suitable. If the conductor coating is made of polypropylene, polypropylene or high-pressure polyethylene is suitable as the sensor head material.

If relatively high requirements are set for the positioning of the thermistor 4 within the sensor head, a multi-step injection process is performed according to another embodiment of the invention. An embodiment of this type of temperature sensor formed by a two-step injection process is shown in FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals. In this embodiment, a second injection coating 7 is provided on the first injection coating 5. A positioning member 6 that can be formed by directly injecting the injection coating material 5 in the injection mold is formed in the injection coating material 5 so that the joined body composed of the conductive wire 1 and the thermistor 4 can be positioned better in the injection mold. You may prepare.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of a joined body manufactured according to the present invention.

FIG. 2 is a cross-sectional view of a second embodiment of a joined body manufactured according to the present invention.

[Explanation of symbols]

 1 electric conductor wire 2, 3 core wire 4 thermistor 5, 7 plastic injection coating material 6 positioning member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 390041508 Siemens, Matsushita, Components, Gezelshyaft, Mitt, Besilyenktel, Haftung, und, Companion, Comandate, Geselsyaft Siefelt Science Sights, Things, Things, and Things, Things, Things Federal Republic of Germany Miyunchen (No street number) (72) Inventor Geralt Kreiber Austria 8073 Graz Fuertkirchen Wagner Tschyutraße 16

Claims (3)

[Claims] 1. First, the connection terminal of the thermistor is electrically and mechanically joined to the core wires (2, 3) of the electric conductor (1) to form moisture between the electric conductor (1) and the thermistor (4) of the temperature sensor. A method for forming a non-permeable joint, characterized in that the wire end and the thermistor (4) at this end are injection-coated with a plastic material (5, 6, 7) that tightly adheres to the wire covering. And method for forming a bonded body of a thermistor of a temperature sensor and an electric wire. 2. Method according to claim 1, characterized in that a thermoplastic material is used as the plastic material (5, 6, 7). 3. Method according to claim 1, characterized in that the injection coating of the plastic material (5, 6, 7) is carried out in a multi-step injection process.