JPS5935782Y2 - Temperature sensor for air conditioning equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature sensor for an air conditioner.

In general, air conditioners for vehicles detect outside air temperature, inside air temperature, freezing temperature of the evaporator, etc., and use these to adjust the mixing ratio of warm air and cold air, and also control the on/off of the compressor. Detecting accurately is extremely important for air conditioning control.

Conventionally, a thermistor element has been used as a means for detecting the temperature, and an example of its structure is shown in FIG.

The button 1 in the figure is a thermistor element obtained by mixing and annealing oxides such as cobalt, manganese, nickel, chromium, etc. and barium titanate, etc. Lead wires 2 such as platinum wires are soldered to both ends of this element 10. Further, the entire element 1 is sequentially covered with surface layers such as Acmec 3, Eviform 4, and Cerakote 5, which are mainly made of epoxy-based synthetic resin.

However, according to the configuration on the ground, since the element 1 is covered with a surface layer mainly made of synthetic resin, moisture from the outside may penetrate through the surface layer and reach the element 1. However, since solder powder adheres to the surface of the element, the electrical characteristics of the sensor itself tend to deteriorate.

Such a tendency is noticeable when the sensor itself is downsized to improve sensitivity, or when the temperature sensor is placed close to the evaporator and placed in an external environment with 100% humidity.

The purpose of the present invention is to eliminate the above-mentioned drawbacks by eliminating soldering and directly surrounding the outer periphery of the element with glass, and will be explained in detail using an underground embodiment.

FIG. 2 is a simplified configuration diagram showing an embodiment of a temperature sensor for an air conditioner according to the present invention. A low resistance film γ of silver or the like is deposited on the surface by plating, vacuum evaporation, or sputtering.

The end face of an electrode 9 formed by enlarging the diameter of the end of the lead wire 8 is pressed onto this flat surface, and the end face of the electrode 9 is also coated with a low resistance coating 10 of silver or the like in advance in the same manner as described above. It will be worn.

Thereby, the element 6 and the electrode 9 are electrically connected via the low resistance coatings T and 10.

With the electrode 9 in pressure contact with the element 6, the entire element including the electrode 9 is directly covered with a glass 11, and this glass 11, including the lead wire 8, is covered with a surface layer 12 made of epoxy synthetic resin. It is covered with

The button and lead wire 8 may be led out directly from the surface layer 12, but as shown in FIG. Covering layer 12
It may be covered with

According to the above configuration, since the entire element 6 is covered with the glass 11, even if the element 6 is placed close to the evaporator, the moisture is blocked by the glass 11, so deterioration of characteristics due to moisture can be suppressed. .

In addition, the low resistance coatings I and 10 are applied to the contact surfaces of the element 6 and the electrode 9 by plating or sputtering, without using soldering, and are then pressure-bonded to each other. For adoption, a mask can be used to apply a low-resistance coating only to the necessary parts, which prevents contamination of unnecessary parts of the element 6, prevents deterioration of electrical characteristics, and protects the element 6 from being contaminated. The connection work with the electrode 9 can be simplified, and miniaturization is also possible.

Here, in accordance with the present invention, the contact surface between the element 6 and the electrode 9 may be roughened in advance to increase the contact area.

Alternatively, the low resistance coating 10 formed on the electrode 9 may be omitted, and the electrode 9 may be brought into direct contact with the end surface of the element 6.

As explained above, according to the present invention, the end surfaces of the lead wires are pressed into contact with both end surfaces of the thermistor element, and the entire area including the thermistor element and the end surfaces of the lead wires is directly covered by glass, so that it is free from moisture. Characteristic deterioration can be suppressed.

[Brief explanation of drawings]

FIG. 1 is an exploded view showing an example of a conventional temperature sensor for an air conditioner, and FIG. 2 is a sectional view showing an embodiment of the temperature sensor for an air conditioner according to the present invention. 6.--Thermistor element, γ, 10.--Low resistance coating,
8... Lead wire, 9... Electrode, 11... Glass.

Claims (1)

[Scope of utility model registration request] (1) The end surfaces of the lead wires are pressed against both end surfaces of the thermistor element, and in the press-contact state, the entire area including the thermistor element and the end surfaces of the lead wires is directly covered with glass, and the above lead wires and the external lead wires are 1. A temperature sensor for an air conditioner, characterized in that the entirety including the connecting portion and the glass is covered with a synthetic resin layer. (Odor) A temperature sensor for an air conditioner according to claim 1 of the utility model registration claim, in which a low-resistance conductive film is coated on one or both of the contact surfaces of the thermistor and the lead wire.