JP3146813B2 - Temperature detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detecting device used for detecting temperatures at various places.

[0002]

2. Description of the Related Art A conventional temperature detecting device comprises a cylindrical metal case having one end closed, a temperature detecting element housed in one end of the metal case, and one end connected to the temperature detecting element. And a second lead having one end electrically connected to the other end of the first lead in the metal case.

That is, in order to prevent the temperature detecting element from deteriorating at a high temperature, the temperature detecting element is housed in a metal case,
The detection signal is output to the outside of the other end of the metal case via the first and second lead wires.

[0004]

The problem with the above arrangement is that the temperature detecting element is damaged by mechanical shock.
That is, in order to prevent rattling in the metal case, the outer periphery of the temperature detecting element is filled with a filler. When transmitted to the detecting element, the temperature detecting element is damaged. Therefore, an object of the present invention is to prevent the temperature detecting element from being damaged.

[0005]

According to the present invention, a filler is provided on an outer peripheral portion of the temperature detecting element, and a space between the filler and the temperature detecting element is provided.
Alternatively, at least one between the filler and the inner surface of the metal case is provided with a coating material.

[0006]

With the above arrangement, the metal case, the filler and the temperature detecting element are provided by the coating material provided at least between the temperature detecting element and the filler or between the filler and the inner surface of the metal case. As a result, the expansion and contraction due to the heat of the metal case is not transmitted to the temperature detecting element via the filler as it is, so that the temperature detecting element is not damaged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a metal case made of stainless steel having a thickness of 0.55 mm, the front end of which is closed, and the rear end of which is open. A temperature detecting element 2 is housed inside the metal case 1 as shown in FIG. The temperature detecting element 2 is composed of a thermistor element 3 and an alkali glass 4 covering the outer periphery thereof. Fe-Ni is provided on both surfaces of the thermistor element 3.
The tip of a first lead wire 5 having a circular cross section obtained by applying an Ni plating to an alloy is welded.
Of the lead wire 5 at the same time. As shown in FIG. 2, the rear end of the first lead wire 5 penetrates a through hole 7 provided in an insulator tube 6 made of alumina and passes through a relay terminal 8 shown in FIG. Is electrically connected to one end of the As shown in FIGS. 3 and 4, the relay terminal 8 is integrated with the terminal fixing body 9 in a state where the tip side is bent at a right angle as shown in FIG. The terminal fixing body 9 is formed of an insulating resin, and a receiving port 10 into which a rear end portion of the insulator tube 6 is inserted is provided at a front end side thereof.
When the rear end of the porcelain tube 6 is inserted at 0, the four ribs 11 provided on the inner surface shown in FIG. 5 are deformed, and the rear end of the porcelain tube 6 is fixed by the reaction. In other words, this socket 1
The rear end of the porcelain tube 6 is press-fitted and fixed in the cylinder 0. Now, two through holes 12 are provided in the receiving port 10 of the terminal fixing body 9, and a gap 13 is provided between them.
The front end of the through hole 12 is expanded toward the partition 13. That is, after the rear ends of the first lead wires 5 are separated by the threshold portions 13, the rear ends of the first lead wires 5 pass through the respective through holes 12 and are pushed out onto the relay terminals 8 along the respective slopes. As shown in FIGS. 3 and 4, welding portions 14 and 15 having different lengths are provided in a portion of the relay terminal 8 from which the first lead wire 5 is pushed out. These welded portions 14 and 15 are formed by extruding the relay terminal 8 toward the front surface at a predetermined interval. Therefore, when the first lead wire 5 extruded here is resistance-welded, the weld 1
Individual welds 1 than when 4 and 15 are integrated
As a result, the welding resistances of the welded portions 14 and 15 become high, and as a result, the temperatures of the individual welded portions 14 and 15 become high, so that the welding can be reliably performed with the rear end of the first lead wire 5. Next, the connecting portion 16 at the rear end of the relay terminal 8 is
After welding, the tip of the lead wire 5A is further caulked and fixed. The end of the relay terminal 8 and the end of the second lead wire 5A are connected to the through hole 1 of a rubber waterproof tube 17 for waterproofing.
8. Next, the waterproof structure will be described. That is, as shown in FIG. 1, the distal end of the waterproof tube 17 is brought into contact with the rear end of the terminal fixing body 9, and the outer periphery of the portion is made of aluminum having a thickness of 0.3 mm, which is thinner than the metal case 1. A metal tube 19 is mounted. In this case, the metal case 1 located on the distal end side of the terminal fixing body 9
As shown in FIG. 1, drawing is performed such that the diameter of the distal end side is smaller than that, and as a result, the distal end of the terminal fixing body 9 is in contact with the step portion 20 of the metal case 1. Therefore,
As shown in FIG. 1, if the metal case 1 located at the rear end of the metal tube 19 is drawn so as to have a small diameter over the entire circumference, the narrowed portion 21 causes the terminal fixing member 9 to pass through the metal tube 19. Is pressed and fixed to the step portion 20. Then, in this state, the waterproof tube 17 on the inner side thereof is compressed by the throttle portion 21, whereby the throttle portion 21,
The waterproof tube 17 and the jacket 22 of the second lead wire 5A are crimped, thereby preventing the inner surface of the metal case 1 from being pressed. Further, according to this machine, even if a tensile force is applied to the second lead wire 5A, the force reaches only the relay terminal 8 integrated with the terminal fixing body 9, and thus the thin first wire 5A Is not cut off. In addition, metal tube 1
The rear end 9 is partially deformed inward by the constricted portion 21. Since the waterproof tube 17 is provided inside the rear end, a portion corresponding to the deformed portion is a second lead wire. The contact with the current-carrying part does not occur because it reaches the end of the jacket 22 of 5A. In FIG. 1, reference numeral 23 denotes a protective tube. Reference numeral 24 denotes a mounting screw, by which the temperature detecting element 2 is mounted, for example, on a high-temperature portion of the engine as desired. 25
Is the gasket at that time. In the above configuration, the metal case 1 located on the outer periphery of the temperature detecting element 2 is filled with a filler 26 made of alumina / silica as shown in FIG. As shown in FIGS. 1 and 2, the filler 26 is filled up to the outer periphery of the rear part of the insulator tube 6.
Next, a method of filling the filler 26 will be described. First, the liquid filler 26 is put into the metal case 1 using a syringe needle-like jig. Next, as shown in FIG. 2, the temperature detecting element 2 in which a coating film is formed on the outer periphery of the glass 4 by using a coating material 27 made of phosphate is formed together with the insulator 6, the terminal fixing body 9, the waterproof tube 17, and the metal tube 19. insert. Then, the solvent in the filler 26 is discharged from the rear end of the metal case 1 and solidified by heating at 200 ° C. for 1 hour in this state. However, the coating material 27 does not substantially integrate the filler 26 and the glass 4. That is, the glass 4 and the coating material 27 are firmly integrated by the high-temperature treatment, but the coating material 27 and the filler 26 are not integrated. Therefore, the expansion and contraction of the metal case 1 due to the temperature is not transmitted to the temperature detecting element 2 as it is, and as a result, the temperature detecting element 2 is not damaged. When the glass 4 is made of lead glass and a filler containing an alkaline solvent is used as the filler 26, the glass 4 can be used without using the coating material 27.
And the filler 26 are not integrated, and the same effect can be obtained. In FIG. 2, the coating material 27 may be provided between the filler 26 and the metal case 1. further,
In FIG. 2, the first lead wire 5 is inserted and the first lead wire 5
This is preferable because it can be easily distributed to the through holes 12.

[0008]

As described above, according to the present invention, the filler is provided on the outer periphery of the temperature detecting element, and at least the space between the filler and the temperature detecting element or between the filler and the inner surface of the metal case is provided. One is provided with a coating material. With the above configuration, the coating material provided on at least one of between the temperature detecting element and the filling material or between the filling material and the inner surface of the metal case allows the metal case, the filling material, and the temperature detecting element to be formed. As a result, the expansion and contraction due to the heat of the metal case are not transmitted to the temperature detecting element via the filler as it is, so that the temperature detecting element is not damaged.

[Brief description of the drawings]

FIG. 1 is a front view of a half section showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view thereof.

FIG. 3 is a plan view showing a half of the terminal fixing body as a cross section.

FIG. 4 is a front view thereof.

FIG. 5 is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal case 2 Temperature detection element 5 1st lead wire 5A 2nd lead wire 6 Insulator tube 8 Relay terminal 9 Terminal fixed body 26 Filler

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-233334 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01K 7/22

Claims (9)

(57) [Claims] 1. A cylindrical metal case having one end closed,
A temperature detecting element housed at one end in the metal case, a first lead wire having one end connected to the temperature detecting element, and one end connected to the other end of the first lead wire in the metal case. A second lead wire electrically connected on the side, a filler is provided on an outer peripheral portion of the temperature detecting element, and a space between the filler and the temperature detecting element or between the filler and the temperature detecting element is provided . At least one between the material and the inner surface of the metal case
And a coating material is provided on the first lead wire.
The other end and one end of the second lead wire are electrically connected via a relay terminal.
And the relay terminal is fixed to a terminal fixing body . To 2. A method according to claim 1 and the first lead wire is temperature detecting element of the porcelain bushing is electrically connected to the relay terminal through the through-hole of the hollow insulator fixing the end opposite to the terminal fixing member The temperature detecting device according to the above. 3. The temperature detecting device according to claim 2, wherein the diameter of the through hole of the insulator tube is larger at both ends than at the inside. 4. A metal tube is attached to an end of the terminal fixed body opposite to the temperature detecting element, and a metal case portion of the metal tube located at an end of the metal tube opposite to the terminal fixed body is directed inward. The temperature detection device according to claim 1, which is narrowed down. 5. A metal case which is located to the temperature detecting element side of the terminal fixing member has a smaller diameter than the terminal fixing moiety 請
The temperature detection device according to claim 4 . 6. The temperature detecting device according to claim 4, wherein the metal tube has a smaller thickness than a metal case. 7. The method according to claim 4, wherein the metal case is formed of stainless steel and the metal tube is formed of aluminum.
Onboard temperature detector. 8. A terminal fixing member has two through holes, in the temperature detecting element side end portion of the through holes, the temperature detection device according to claim 1 which has been expanded, respectively through holes. 9. A cylindrical metal case having one end closed,
A temperature detecting element housed at one end in the metal case, a first lead wire having one end connected to the temperature detecting element, and one end connected to the other end of the first lead wire in the metal case. An electrically connected second lead wire, wherein the temperature detecting element is configured by coating the outer periphery of the element with lead glass, and the outer periphery of the lead glass is provided with a filler having an alkali component. Temperature detector.