JP2815555B2 - Method for forming a joined body between a thermistor and an electric conductor of a temperature sensor - Google Patents

Abstract

The method manufactures a moisture tight connection between a cable (1) and a thermistor (4) of a temperature sensor. First of all thermistor contacts are electrically and mechanically connected to the cores (2, 3) of the cable. The cable end and the thermistor arranged at the cable end are injection moulded around by synthetic material which adheres tightly to the cable sleeve. In one embodiment the synthetic material is a thermoplast. The injection moulding is carried out in a multi-stage injection process. <IMAGE>

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-tight joint between a thermistor and an electric wire of a temperature sensor.

[0002]

BACKGROUND OF THE INVENTION In the field of temperature control and refrigeration and cooling systems, temperature measurement of evaporators and / or temperature-controlled rooms requires a temperature sensor that is wired without moisture. Today such temperature sensors are embedded in a plastic sleeve. There is the problem that moisture must be prevented from penetrating into the area between the electrical conductor and the sensor case or the implant in the plastic sleeve. Therefore, this type of conjugate generally does not have an airtight structure.

[0003] This difficulty cannot be solved satisfactorily without considerable expense, such as the additional application of shrink tubing or packing members or the additional bonding of 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-tight joint of the type described above.

[0005]

According to the present invention, first, the connection terminal of the thermistor is electrically and mechanically electrically connected.
Joined to the core of the air conductor, then the end of the conductor and this end of the conductor
That firmly adheres the thermistor in the section to the conductor coating material
Injection coating by multi-stage injection process using tic material
Impermeable to moisture between the electrical conductor and the thermistor of the temperature sensor
In a method for forming a joined body, a first injection step
Injection coating with a coating material having a positioning member in
In the injection step 2, the first coating material and the positioning member
The second coating is injection coated on top .

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
I will tell .

As shown in FIG. 1, a thermistor 4 is electrically and mechanically attached to core wires 2 and 3 protruding from an electric conductor 1. This attachment can be performed by, for example, brazing, welding, or shrinking, which is stable against temperature changes, between the conductors 2 and 3 and the electrodes or connection terminals of the thermistor 4 ( not shown).

The conductive wire 1 and the thermistor 4 thus formed
A unit consisting of
In the injection process, injection coated with a coating material 5 made of plastic Zairei Ebanetsu plastic material to firmly contact the thermistor 4 at the range and the end region of the lead end to lead dressing. This coating material 5 is positioned by direct injection in the injection mold.
The member 6 is formed. The positioning member 6 allows the
More good lines 1 and thermistor 4 or we made conjugate in an injection mold
Thermistor in the sensor head
When altitude requirement for star 4 positioning is set
Can also be accommodated.

In the second injection step, the position of the coating material 5
Injection coating of the second coating material 7 on the determining member 6
Thereby, the sensor head is completed.

The following materials have been found to be advantageous, for example, as the joined body of the conductor covering material and the sensor head material. When the conductor coating material is polyvinyl chloride,
The sensor head member polybutylene Les phthalate (P
BT) is suitable. When the conductor covering material is formed based on polypropylene, polypropylene or high-pressure polyethylene is suitable as the sensor head material.

[Brief description of the drawings]

FIG. 1 is a cross section of an embodiment of a joined body manufactured according to the present invention .
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric lead wire 2, 3 core wire 4 Thermistor 5, 7 Plastic injection coating material 6 Positioning member

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Geralt Kreiber 8073 Graz-Fertkirchen Wagnetschütlersee 16 (56) References JP-A-6-132335 (JP, A) JP-A-1-97822 (JP) , A) (58) Field surveyed (Int.Cl. ⁶ , DB name) H01C 7/02-7/22

Claims (2)

(57) [Claims] 1. A first bonded to the core wire (2,3) of electrically and mechanically an electric conductor (1) the connection terminals of the thermistor, the following
A wire end and a thermistor at the wire end (4)
A plastic material (5, 6,
7) Injection coating by multi-step injection process using electricity
Moisture between the conducting wire (1) and the thermistor (4) of the temperature sensor
A method for forming an impermeable conjugate, comprising:
Coating material having positioning member (6) in injection process
(5) is injection-coated, and the first coating is performed in the second injection step.
Second covering material on covering material (5) and positioning member (6)
(7) A method for forming a joined body of a thermistor of a temperature sensor and an electric conductor, wherein the joined body is injection-coated . 2. The method as claimed in claim 1, wherein a thermoplastic is used as the plastic material (5, 6, 7).