JPH07159248A - Contact type temperature detector - Google Patents

Abstract

PURPOSE:To provide a contact type temperature detector which can lightly touch the contact face of various shape of an object to be measured. CONSTITUTION:The contact type temperature detector comprises a protruding contact part 2 provided with a temperature detecting element 1 on the top thereof, a coil spring 4 having one end bonded to the contact part 2, and a cylindrical casing 3 for receiving the coil spring 4 while securing at the other end thereof and guiding the coil spring 4 slidingly in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type temperature detector for contacting an object whose temperature is to be measured and measuring the temperature.

[0002]

2. Description of the Related Art When measuring the temperature of an object, a method of bringing a temperature measuring device into contact with the object to be measured is often used. In order to measure correctly, it is necessary to make sufficient contact, but when measuring the surface temperature of a moving object, pressing it too hard may cause damage to the contacted object, so contact the contact part with a spring or A support plate or the like is used to press it with a constant force. In case of contact, the shape of the object to be measured and the shape of the contact part of the temperature measuring device must match, and the sensor part must also have a shape corresponding to this, depending on the shape of the measurement surface, such as the plane or spherical surface. Becomes

FIG. 3 is a diagram showing an example of a conventional contact type temperature measuring device. In (a), the temperature detecting element 11 is attached to a polyimide support plate 12, and the support plate 12 is supported by a leaf spring 13 fixed to a casing 14. In (b), the temperature detecting element 11 is attached to an Ω-shaped leaf spring 13, and both ends of the leaf spring 13 are fixed to the casing 14.

[0004]

In the case of the temperature measuring instrument shown in FIG. 3 (a), the contact surface of the object to be measured may be a projection such as a spherical surface, but in the case of a flat surface, the temperature detecting element 11 The contact with the measurement surface becomes insufficient, and the reaction force of the supporting plate is large, which may cause strong contact with the object to be measured, resulting in damage. Further, in the case of (b), since the leaf spring 13 is used, it is difficult to make a light contact with the object to be measured, and further, since the leaf spring 13 is a metal, the object to be measured is easily scratched when measuring the running object. Further, when the object to be measured is linearly or rotationally moved, it is difficult to make continuous contact.

The present invention has been made in view of the above-mentioned problems, and it is possible to make a light contact with an object to be measured, particularly an object to be measured during traveling, and a contact that can correspond to various shapes of contact surfaces. An object is to provide a contact-type temperature sensor having a surface.

[0006]

In order to achieve the above-mentioned object, a convex contact portion having a temperature detecting element on the top, a coil spring fixed to the contact portion at one end, and another coil spring And a casing which fixes the ends and includes the coil spring and guides the coil spring slidably in the axial direction.

Further, a convex contact portion having a temperature detecting element on the top, a bellows fixed to the contact portion at one end, and the other end of the bellows fixed and including the bellows in the axial direction thereof. And a casing for slidably guiding it.

Further, a thin film is deposited by a hard material on the outer surface of the contact portion.

[0009]

[Function] Since the contact portion is convex and the temperature detecting element is provided on the top of the contact portion, the temperature detecting element can surely contact and measure the temperature accurately even if the surface to be measured is a flat surface or a curved surface such as a spherical surface. can do. Further, the contact portion is supported by the coil spring, and the coil spring is slidably guided in the axial direction, so that the contact portion is pressed against the surface to be measured with a constant force. Since the coil spring can easily set the spring constant to a predetermined value, the pressing force is reduced. For example, the spring constant can be set to 1 to 5 gf / mm so that the temperature can be measured without scratching the surface to be measured. it can.

When the coil spring is a bellows, the spring constant of the bellows itself is set to a predetermined small value so that the pressing force is reduced as in the case of the coil spring and the surface to be measured is not damaged. Can measure temperature. Further, in the case of the bellows, since the inside of the casing can be shielded from the outside, it is possible to prevent dust and water from adhering to the lead wires and the connector inside.

Also, by depositing a thin film of a hard material on the outer surface of the contact portion, the wear resistance is improved and the life is extended.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the configuration of the first embodiment of the present invention. (A) shows the whole cross section, (b) shows the top details of the contact portion. Reference numeral 1 is a temperature detecting element, for which a thermistor or a thermocouple is used. The thermistor can be made small and highly sensitive by forming and sintering metal oxide powder using vapor deposition technology, and can also measure small objects. Therefore, the response speed is fast. The contact portion 2 is composed of a partial spherical shell 2a and a flange portion 2b provided around the peripheral spherical shell 2a, and the temperature detecting element 1 is attached to the inner surface of the top of the partial spherical shell 2a. The contact portion 2 is made of polyimide, and a thin film 2c is vapor-deposited on the outer surface, which is a contact surface for the object to be measured, with a hard material such as diamond-like carbon (DLC) or titanium nitride (TIN) to improve wear resistance. Is measuring.

A coil spring 4 having a diameter slightly smaller than the outer circumference is attached to the lower surface of the outer circumference of the collar portion 2b. The spring constant of the coil spring 4 is 1 to 5 gf / mm.
The degree is good, and is 2 gf / mm in this embodiment. The casing 3 is a hollow cylinder, and the coil spring 4 is provided in a portion having an inner diameter slightly larger than the outer diameter of the coil spring 4.
And the end opposite to the collar portion 2b of the coil spring 4 is fixed. As a result, the contact portion 2 becomes the coil spring 4
Guided by the casing 3 so as to be slidable in the axial direction. The upper end of the casing 3 is flush with the flange 2b, and a connector mounting plate 8 is provided at the lower end of the casing to fix a coaxial connector 7 arranged inside the casing 3. The lead wire 6 of the temperature detecting element 1 passes through the inside of the coil spring 4 and is connected to the coaxial connector 7.

FIG. 2 is a sectional view showing the structure of the second embodiment. This embodiment is the same as FIG. 1 except that the coil spring 4 of the first embodiment shown in FIG. 1 is replaced with a bellows 5. The spring constant of the bellows 5 is also the coil spring 4
1 to 5 gf / mm is the same as above, and 2 g in this embodiment.
f / mm. By mounting the upper end of the bellows 5 in close contact with the lower surface of the collar portion 2b and fixing the lower end to the mounting portion 3a in the casing 3 having an inner diameter smaller than the diameter of the bellows 4, the connector mounting from the bellows 5 and the mounting portion 3a is performed. The inside of the casing 3 up to the plate 8 can be sealed,
This prevents dust and water from adhering to the lead wire 6 and the coaxial connector 7 inside.

The temperature is measured by pressing the temperature detecting element 1 of the contact portion 2 against the surface to be measured. The pressing may be a light touch. It is possible to measure not only when the surface to be measured is stationary but also when it is moving. When the surface to be measured is linearly or rotationally moved at high speed, a thin air layer is formed between the surface to be measured and the temperature measuring element 1 because the pressing force of the contact portion 2 is small. Since it is an order, it does not interfere with temperature measurement. Further, since the temperature measuring element 1 is not in direct contact with the surface to be measured by this air layer, wear can be prevented. On the other hand, in the case of the conventional contact type temperature measuring device,
Since the pressing force is large, the contact part is pressed against the surface to be measured and the frictional force pulls it in the moving direction, so stable temperature measurement cannot be performed. In the case of the present invention, even at a low speed where an air layer is not generated, since the pressing force is small, the frictional force is small and the tensile force in the moving direction is small, so that stable temperature measurement can be performed.

[0016]

As is apparent from the above description, according to the present invention, the contact portion has a convex shape, and the pressing force against the object to be measured can be set to a small value by using a coil spring or a bellows. Therefore, the object to be measured having various shapes of the surface to be measured can be measured, and the object to be measured is scarcely damaged. In addition, it is possible to measure the moving surface to be measured, and especially when moving at a high speed, a thin air layer is formed between the surface to be measured and the temperature measuring element attached to the top of the contact part, which causes contact. Prevent wear.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a diagram showing an example of a conventional contact type temperature measuring device.

[Explanation of symbols]

 1 temperature detecting element 2 contact part 2a partial spherical shell 2b collar part 3 casing 3a mounting part 4 coil spring 5 bellows 6 lead wire 7 coaxial connector 8 connector mounting plate

Claims (3)

[Claims] 1. A convex contact portion having a temperature detecting element on the top, a coil spring fixed to the contact portion at one end, and the other end of the coil spring being fixed and including the coil spring. A contact-type temperature sensor, comprising: a casing that guides slidably in the axial direction. 2. A convex contact portion having a temperature detecting element on the top, and a bellows fixed to the contact portion at one end,
A contact-type temperature sensor, comprising: a casing to which the other end of the bellows is fixed and which includes the bellows and is slidably guided in the axial direction thereof. 3. The contact type temperature sensor according to claim 1, wherein a thin film is deposited on the outer surface of the contact portion by a hard material.