JP3055727U - Thermistor temperature sensor for air conditioner discharge pipe with improved water resistance and thermal shock resistance - Google Patents

Abstract

(57) [Problem] To provide a thermistor temperature sensor for an air conditioner discharge pipe with improved water resistance and thermal shock resistance. SOLUTION: The configuration as a thermistor temperature sensor for an air-conditioner discharge pipe having improved water resistance and heat shock, which has a structure in which a filling resin having excellent waterproofness and heat shock resistance and a protective case considering heat transfer to a heat sensitive part is combined. Have.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a thermistor temperature sensor for an air-conditioner discharge pipe that has a wide range of operating temperatures, a large heat shock, and has improved water resistance and heat shock for use requiring waterproofness, such as an air-conditioner refrigerant pipe discharge pipe. Things.

[0002]

[Prior art]

 2 to 4 show schematic sectional structural views of first to third conventional thermistor temperature sensors. 2, reference numeral 1 denotes a glass-sealed thermistor element, 2a and 2b denote lead wire connecting portions, 3 denotes a coating resin, 4 denotes a protective case, 5 denotes a filling resin, and 6 denotes a lead wire. In the conventional example 2 of FIG. 3, reference numeral 7 denotes a chip type thermistor element. In Reference Example 3 of FIG. 4, reference numeral 8 denotes a diode-type glass-sealed thermistor element.

Conventionally, a thermistor sensor for an air conditioner refrigerant pipe generally has a structure shown in FIGS. 2, 3, and 4, and is used for a long time in a temperature range exceeding + 110 ° C. or an environment where a large heat shock is applied. Could not.

Conventional examples 1 to 3 shown in FIGS. 2 to 4 have the following disadvantages.

(I) When a hard epoxy resin is used as the filling resin 5, the filling resin 5 cannot reduce the mechanical stress at the time of expansion and contraction caused by thermal shock, and the filling resin 5 comes off from the protective case 4.

(Ii) When a soft epoxy resin is used as the filling resin 5, the hardness increases by heating (110 ° C. or higher) and the density increases, so that the filling resin 5 itself cracks.

(Iii) In order to solve the problems (i) and (ii), when a urethane resin or the like having a small change in hardness due to heating is selected as the filling resin 5, the thermal time constant becomes extremely slow because of low thermal conductivity. I will.

(Iv) In order to solve the problems (i) and (ii), when a urethane resin or the like having a small change in hardness due to heating is selected as the filling resin 5, the thermal conductivity is low and the thermistor element (1, 7, 8) Since the position in the protective case 4) varies, the thermal time constant varies.

(V) To solve (iii) and (iv), if the diameter of the protective case 4 itself is reduced, the coating of the lead wire can easily touch the inner wall of the protective case 4. When the coating of the lead wire 6 touches the inner wall of the protective case 4, the wraparound of the filling resin 5 at that portion becomes worse, and water penetrates into the inside of the protective case 4 through the poorly wrapping portion of the filling resin 5. was there.

[0010]

[Problems to be solved by the invention]

 The object of the present invention is to solve the above-mentioned drawbacks of the conventional technology, to shorten the thermal time constant in structure, to suppress variations, to improve the wraparound of the filling resin, to improve the waterproof performance, to reduce the hardness of the filling resin, and to reduce the heat shock. The temperature of the thermistor for the air-conditioner discharge pipe is improved with improved water resistance and heat-resistant shock with a wide operating temperature range, such as the air-conditioner refrigerant pipe discharge pipe section, where the resin is not released from the protective case and the burden on the thermistor element is extremely low. The purpose is to provide sensors.

[0011]

[Means for Solving the Problems]

 The present invention has the following configuration. That is, as a thermistor temperature sensor for an air-conditioner discharge pipe with improved water resistance and thermal shock, characterized by combining a filled resin 10 having excellent waterproofness and thermal shock resistance with a protective case 9 considering heat transfer to the heat-sensitive part. It has the following configuration.

[0012]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described.

(I) For example, a thermistor element such as the glass-sealed thermistor element 1, the chip-type thermistor element 7, or the diode-type glass-sealed thermistor element 8 is connected to the lead wire 6 at the lead wire connecting portions 2 a and 2 b. Connect by soldering or welding.

(Ii) The protective case 9 used has, for example, an inner diameter near the thermistor element such as the glass-sealed thermistor element 1 or the chip-type thermistor element 7 or the diode-type glass-sealed thermistor element 8. Use a thin (though enough space for the thermistor element and its connection area can be secured), thick wall, wide inside diameter from near the thermistor element to the entrance, and thin.

(Iii) The protective case 9 of (ii) is filled with a filling resin 10 such as urethane resin, which has a low hardness and a small increase in hardness even when exposed to a high temperature.

(Iv) The thermistor element (1, 7, 8) connected to the lead wire 6 in (i) is inserted into (iii), and the filling resin 10 is cured.

The present invention has the above configuration.

[0018]

【Example】

 Embodiment 1 FIG. 1 shows a schematic cross-sectional structure of a thermistor temperature sensor for an air conditioner discharge pipe with improved water resistance and thermal shock as a first embodiment of the present invention. In FIG. 1, 1 is a glass-sealed thermistor element, 2a and 2b are lead wire connecting portions, 6 is a lead wire, 9 is a protective case, and 10 is a filling resin. The manufacturing method will be described below.

(I) The glass-sealed thermistor element 1 is connected to the lead wire 6 at the lead wire connecting portions 2a and 2b.

(Ii) The protective case 9 used has a small inner diameter near the glass-sealed thermistor element 1 and a large thickness near the glass-sealed thermistor element 1, and an entrance from above the vicinity of the glass-sealed thermistor element 1. Use a material with a large inner diameter and a thin wall.

(Iii) The protective case 9 of (ii) is filled with a filling resin 10 such as urethane resin having a low hardness and a small increase in hardness even when exposed to a high temperature.

(Iv) The glass-sealed thermistor element 1 connected to the lead wire 6 in (i) is inserted into (iii), and the filling resin 10 is cured.

The first embodiment of the present invention is a thermistor temperature sensor for an air-con discharge pipe having the above-described structure and improved water resistance and thermal shock resistance.

In the above example, the glass-sealed thermistor element 1 has been described as an example of the thermistor element, but the chip-type thermistor element 7 similar to the conventional example 2 shown in FIG. 3 and the conventional example 3 shown in FIG. Of course, a similar diode-type glass-sealed thermistor element 8 may be used. Hereinafter, (Example 2) and (Example 3) will be similarly described.

(Example 2) (i) The chip type thermistor element 7 is connected to the lead wire 6 at the lead wire connecting portions 2a and 2b.

(Ii) The protective case 9 used has a small inner diameter near the chip-type thermistor element 7 and a large wall thickness, and has an inner diameter from above the vicinity of the chip-type thermistor element 7 to the entrance. Use a wide and thin one.

(Iii) The protective case 9 of (ii) is filled with a filling resin 10 such as urethane resin having a low hardness and a small increase in hardness even when exposed to a high temperature.

(Iv) The chip type thermistor element 7 connected to the lead wire 6 in (i) is inserted into (iii), and the filling resin 10 is cured.

The second embodiment of the present invention is a thermistor temperature sensor for an air-con discharge pipe having the above-described structure and having improved water resistance and thermal shock resistance.

Embodiment 3 (i) The diode-type glass-sealed thermistor element 8 is connected to the lead wire 6 at the lead wire connecting portions 2a and 2b.

(Ii) The protective case 9 used has a small inner diameter near the diode type glass-sealed thermistor element 8 and a large wall thickness near the diode type glass-sealed thermistor element 8. Use a material with a large inner diameter from the entrance to the entrance and a thin wall.

(Iii) The protective case 9 of (ii) is filled with a filling resin 10 such as urethane resin having a low hardness and a small increase in hardness even when exposed to a high temperature.

(Iv) The diode-type glass-sealed thermistor element 8 connected to the lead wire 6 in (i) is inserted into (iii), and the filling resin 10 is cured.

Embodiment 3 of the present invention is a thermistor temperature sensor for an air-con discharge pipe having the above-described structure and improved water resistance and thermal shock resistance.

[0035]

[Effects of the Invention] According to the thermistor temperature sensor for an air conditioner discharge pipe with improved water resistance and thermal shock of the present invention, the inner diameter of the protective case is made narrower in the vicinity where the thermistor element is accommodated, so that the thermal time constant is faster and Variation is suppressed.

Further, according to the thermistor temperature sensor for an air conditioner discharge pipe with improved water resistance and thermal shock of the present invention, since the inner diameter from the vicinity of the thermistor element to the entrance is wide, the resin filled around the lead wire coating. The wraparound waterproof performance is also improved.

Further, according to the thermistor temperature sensor for an air conditioner discharge pipe with improved water resistance and heat shock of the present invention, the heat shock is reduced due to the low hardness of the filling resin, and the filling resin does not come off from the protective case, and The burden on the thermistor element is extremely small.

[Brief description of the drawings]

FIG. 1 is a schematic sectional structural view of a thermistor temperature sensor for an air-conditioner discharge pipe with improved water resistance and thermal shock as a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional structure diagram of a thermistor temperature sensor as a first conventional example (conventional example 1).

FIG. 3 is a schematic cross-sectional structure diagram of a thermistor temperature sensor as a second conventional example (conventional example 2).

FIG. 4 is a schematic cross-sectional structural view of a thermistor temperature sensor as a third conventional example (conventional example 3).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass-sealed thermistor element 2a, 2b Lead wire connection part 3 Coated resin 4, 9 Protective case 5, 10 Filled resin 6 Lead wire 7 Chip-type thermistor element 8 Diode-type glass-sealed thermistor element

Claims (1)

[Utility model registration claims] 1. A thermistor temperature sensor for an air conditioner discharge pipe with improved water resistance and thermal shock, comprising a combination of a filling resin having excellent waterproofness and thermal shock resistance and a protective case considering heat transfer to a heat sensitive part.