JPH0648218B2 - Contact temperature sensor - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a contact type temperature sensor, and more specifically, when a contact piece constituting a detection end is brought into contact with the surface of a temperature-measuring object, The present invention relates to a temperature sensor capable of accommodating the attitude of a contact piece, particularly the attitude of a contact portion, along the surface of a temperature-measuring object and capable of accurately measuring temperature.

[Conventional technology]

As a detection end, a thermoelectric thermometer is known in which a thermal contact of a thermocouple is fixed behind the contact portion of a contact piece made of a metal plate having a ribbon-like elasticity, and the contact portion is brought into contact with the temperature-measuring object. It is being done.

In this thermoelectric thermometer, for example, as disclosed in Japanese Utility Model Publication No. 46-17197, a contact piece is arranged in a U-shape or a U-shape in front of the protective stopper. The surface is contacted, and at the same time, the contact piece is contacted.

On the other hand, in the temperature measuring section disclosed in Japanese Utility Model Publication No. 45-15988, two ends of the contact piece support both ends of the contact piece in a groove formed at the tip of the thin rod.

[Problems to be Solved by the Invention] As shown in FIG. 8, a contact piece 30 of a commonly used contact type thermometer uses a thin stainless plate or a thermocouple thin plate having a width of about 1 to 5 mm. In a side view, the elastic deformation portions 32 and 33 on both sides of the contact portion 31 are symmetrically extended to form a U-shape or U-shape, and both ends thereof are fixed to a fixing portion or a main body 34 in a side view. A temperature sensitive portion 35 such as a heat contact of a thermocouple is provided at the center of the contact portion 31.

When the temperature is measured, the contact portion 31 is brought into contact with the surface of the temperature-measured body 36, and the main body 34 is pressed to elastically deform the contact piece 30 by a distance l. This contact piece 30 is indicated by a dotted line. As described above, there is a phenomenon in which the contact portion 31 is deformed in a raised state and the central portion of the contact portion 31 rises above the surface of the non-temperature measuring body 36 by a distance δ, and as a result, accurate temperature measurement becomes difficult.

Considering the rising phenomenon of the contact part 31, the elastic deformation part
When a compressive force acts on 32 and 33, both bulge outward and deform. It is considered that a compressive force acts on the contact portion 31 supported by the elastically deformable portions 32 and 33, and as a result, the portion where the temperature sensitive portion 35 is provided floats.

The swelling deformation of the contact portion 31 becomes more remarkable as the size of the contact portion 31 becomes smaller than that of a normal size, and a large error occurs when measuring the temperature in a short time using the downsized one. There is.

On the other hand, the following points can be pointed out regarding the attitude of the thermometer during temperature measurement.

When measuring temperature, when the measurer holds the handle and presses the contact part of the contact piece with the protective tube or the main body (that is, the handle) orthogonal to the surface of the object to be measured, the contact part of the object to be measured is Normal temperature measurement is possible by touching the surface parallel to the surface.

In this case, the surface area of the object to be measured is relatively large, and it is possible to intuitively check whether the posture of the protective tube with respect to the surface of the object to be measured is orthogonal or inclined to this surface. Is. However, if the surface of the temperature-measuring object is as small as a semiconductor device, it is best to apply the contact portion to this surface, and the posture of the contact portion is parallel to this surface. It becomes extremely difficult to intuitively confirm whether or not there is or is inclined. This problem is more likely to occur as the number of measured objects increases.

As described above, since the contact piece is formed in a U shape as a whole and is fixed to the protective tube or the main body, the contact portion has to follow the posture of the protective tube. Depending on the posture of the person, it becomes difficult to measure the temperature accurately.

On the other hand, when the contact part and the deformed parts extending to both sides are reduced in order to reduce the size of the U-shaped contact piece, the contact piece gradually becomes less flexible and makes contact with the surface of the temperature-measuring object. It becomes difficult to bring the parts into contact accurately. Therefore, the error of the measured temperature tends to be large, and in reality, there is a limit to downsizing the contact piece.

According to the present invention, in the conventional temperature sensor, the flexibility is lost when the contact piece is downsized, and in essence, the attitude of the contact portion is automatically adjusted according to the surface of the temperature-measured body. (EN) A contact-type temperature sensor that eliminates the problem that a temperature error is likely to occur because it has no function.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the contact-type temperature sensor of the present invention comprises an elastic body, a ring-shaped contact piece comprising a contact portion and elastic deformation portions extended from both ends of this contact portion, and the contact portion. A temperature sensor provided with a temperature sensitive part, wherein the elastically deformable parts extend over each other beyond a center line of the contact piece, overlap each other at least in the vicinity of the center line, and the end parts are not fixed to the support body. It is characterized by being supported by.

Preferably, the elastically deformable portion has a first deformable portion and a second deformable portion, and the second deformable portion extends in opposite directions beyond the center line of the ring-shaped contact piece, and the second deformable portion is It is characterized in that they are overlapped with each other in a front view, and the ends of the second deformable portions are supported by a structure such as a pin or the like that does not generate a bending moment by a method other than fixing.

[Action]

According to the present invention, since the temperature sensor supports both ends of the contact piece formed in a ring so that a part thereof is overlapped by a method such that a pin or other bending moment is not generated, the contact portion is contacted with the surface of the temperature-measuring object. Deforms as a whole while following.

Therefore, unlike the conventional temperature sensor, the contact portion does not float up due to the compressive force, and a tensile force which is the opposite of that of the conventional temperature sensor acts. Further, it is possible to prevent the contact portion from floating, and it is possible to accurately follow the surface of the non-temperature measuring body, and as a result, it is possible to measure the accurate temperature.

〔Example〕

FIG. 1 is an exploded perspective view of a contact type temperature sensor according to the present invention, and FIG. 2 is an assembly view thereof.

The temperature sensor 1 has a detection end 3 attached to the tip of a connecting pipe 2 fixed to a handle.
The connecting piece support pin 5 of the book is set up, and the engaging portion of the contact piece 6 is fitted into this pin 5.

Then, the heat contact of the thermocouple 7 is fixed to the heat sensitive portion 6b provided at the center of the contact portion 6a of the contact piece 6, and the lead wire 7b of the thermocouple 7 is fixed.
Is fixed to the fixing portion 8 having heat resistance. The fixed portion 8 is separately or integrally connected to the head supporting portion 9, and the tip end of the connecting pipe 2 is fitted to the cylindrical portion 10 extending from the head supporting portion 9. Although not shown, a handle portion is fixed to the connecting pipe 2.

In this embodiment, the mounting portion 4 is formed by bending a metal plate into an L-shaped cross section, and the above-mentioned components are assembled based on this. The opening surface of the mounting portion 4 is closed by a lid body 11 having an L-shaped cross section.

The contact piece 6 is formed by pressing a stainless plate having a thickness of 0.03 to 0.3 mm, a phosphor bronze plate, etc. in the developed shape shown in FIG. 3, and the contact piece 6 contacts the central portion. Part 6a
The first deformed portions 6c and 6c 'on both sides thereof, and the second deformed portions 6d and 6d' are further extended from the first deformed portions 6c and 6c ', respectively. At the end of ′, the mounting parts 6e, 6
e'is formed.

In the present invention, the elastically deformable portion is a portion excluding the contact portion 6a, which means a portion that is deformed when the contact portion 6a comes into contact with the surface of the temperature-measuring body during temperature measurement. For convenience, the first part 6c, 6c 'and the second deformable part 6d, 6d' are shown. However, when the contact piece 6 is formed to have a round shape as a whole, distinguish the deformed part. Will not be possible. Even in such a case, a part of the elastically deformable portion extends in the opposite directions beyond the center line of the contact piece,
It is necessary that they partially overlap.

In this way, the meaning of extending a part of the contact piece beyond the center line is to allow tension to act on the contact portion when the contact piece is deformed during temperature measurement.

Now, the attachment portions 6e, 6e 'are cut off by cutting off a part of the first deformed portions 6c, 6c' and a part of the second deformed portions 6d, 6d '.
f'and formed, and these mounting portions 6e, 6e '
The cutouts 6f and 6f 'are formed opposite to each other with the center line of the contact piece 6 as a boundary.

In the contact piece 6 formed as described above, the second deformable portions 6d and 6d 'are overlapped in parallel as shown in FIG.
The mounting portions 6e, 6e 'formed at the tips of d, 6d' are arranged so as to be adjacent to each other. Then, the contact piece support pins 5a and 5b that are set up in the mounting portion 4 have holes 6g and 6g 'in the mounting portions 6e and 6e'.
Are fitted to each other so that no bending moment is generated at this mounting part.

In this embodiment, the contact piece 6 is formed in a substantially square ring shape, the second deformable portions 6d and 6d 'are extended so as to overlap each other in parallel, and the attachment portions 6e and 6e' are bent in a square shape. It is located inside the piece 6, and the mounting portions 6e, 6e 'are arranged beyond the center line C (see FIG. 5).

Next, the operation of the contact-type temperature sensor according to the present invention will be described with reference to FIGS.

5 (a) and 5 (b) show the case where the temperature-measured body 20 is horizontal, or the connection tube 2 fixed to the handle part with respect to the surface of the temperature-measured body 20.
Is held at a right angle, which is the so-called normal temperature measurement state. The temperature measurement in this state is the same as that of a normal contact type temperature sensor.

FIG. 6 shows a state in which the connecting pipe 2 is held vertically with respect to the temperature-measured body 20 inclined in the front and rear [(b)] and the left and right [(a)], or the connection pipe 2 is measured. It shows a state in which it is held inclined to the left and right and front and back with respect to the surface of 20. In this state, the central axes of the two pins 5a and 5b (lines 5a-5b) are inclined left and right and front and back with respect to the surface of the temperature-measured body 20, and the first deformable portion 6c
The other first deformable portion 6c ′ is located above, and the second deformable portion 6d ′ is located above the second deformable portion 6d.

In the deformed (deflected) portion in this case, the joint point P between the first deformed portion 6c and the second deformed portion 6d is bent most, and then the second deformed portion
6d bends, and the first deformable portion 6c also bends, but the amount is small.

FIG. 7 is a diagram showing a force relationship when the contact piece 6 is pressed into contact with the surface of the temperature-measuring body 20, and when the pressing forces G ₁ and G ₂ act on the pins 5a and 5b, This pressing force G ₁ is decomposed into H ₁ and J _1, and the other pressing force G ₂ is decomposed into H ₂ and J ₂ .

The component forces J ₁ and J ₂ are horizontal forces acting on the contact portion 6a, and their directions are opposite to each other, and have a considerably large value. Therefore, tension acts on the contact portion 6a by the action of the component forces J ₁ and J ₂ .

As shown in FIG. 8, in the conventional sensor, a compressive force is applied to the contact portion 30 from the elastically deformable portions 32, 33 toward the contact portion 31, so that the central portion of the contact portion 30 is raised as indicated by the dotted line. Therefore, the temperature sensing unit 35 is separated from the temperature-measured body 36.

However, in the sensor according to the present invention, as shown in FIG. 7 (a), since the tension composed of the component forces J ₁ and J ₂ acts on the contact portion 6a, the contact portion 6a is kept flat, It can be brought into close contact with the temperature-measured body 36.

〔The invention's effect〕

The contact-type temperature sensor according to the present invention is made of an elastic body,
In a temperature sensor having a ring-shaped contact piece including a contact portion and elastic deformation portions extending from both ends of the contact portion, and a temperature sensor provided in the contact portion, the elastic deformation portion is a center line of the contact piece. Extend over each other, overlap at least in the vicinity of the center line, and the ends are supported unfixed to the support. Therefore, the contact-type temperature sensor according to the present invention can exert the following effects.

(1) At the contact portion, the component force generated along with the deformation of the elastically deformable portion is not the compressive force as in the conventional sensor, but the tensile force. In addition, the mounting part of the contact piece is not fixed, and the bending moment is prevented from occurring in this part, so that the contact part is prevented from rising and, as a result, the temperature sensing part is placed on the surface of the temperature-measuring object. It is possible to bring them into close contact with each other and to measure an accurate temperature.

(2) The elastically deformable portion is composed of the first deformable portion and the second deformable portion as shown in the embodiment and is remarkably long as compared with the conventional sensor. Even in this case, a large elastic deformation amount can be obtained. Therefore,
A sensor suitable for miniaturization can be obtained.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is an exploded perspective view in which a detection end of a contact type temperature sensor is disassembled for easy understanding of components, and FIG. 2 is a perspective view of the detection end. . FIG. 3 is a plan view of the contact piece, and FIG. 4 is a view showing the relationship between the contact piece and the pin formed in an annular shape. 5 (a), (b), 6 (a), (b) and 7 (a), (b) are operation explanatory views showing the relationship between the temperature-measuring body and the annular contact piece. Is. FIG. 8 is an explanatory view showing a main part of a conventional contact type temperature sensor. 1 ... Temperature sensor, 2 ... Connection pipe, 3 ... Detection end, 4 ...
… Mounting part, 5 …… Contact piece support pin, 6 …… Contact piece, 6a…
… Contact part, 6b …… Heat sensitive part, 6c …… First deformation part, 6d …… Second deformation part, 6e …… Mounting part, 6g …… Hole. 30 ... contact piece, 31
…… Contact part, 32,33 …… Elastic deformation part, 34 …… Main body, 35…
… Temperature sensing part, 36… Temperature measurement object.

Claims (1)

[Claims] 1. A temperature sensor comprising a ring-shaped contact piece made of an elastic body and comprising a contact portion and elastically deformable portions extending from both ends of the contact portion, and a temperature sensing portion provided on the contact portion. A contact-type temperature sensor, wherein the elastically deformable portions extend beyond the center line of the contact piece, are overlapped with each other at least in the vicinity of the center line, and end portions are supported in a non-fixed state with respect to a support body.