JP2979264B2 - Contact temperature sensor - Google Patents

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 sensor, and more particularly to a contact type temperature sensor for accurately measuring the temperature of the surface of a moving object to be measured by a contact type.

[0002]

2. Description of the Related Art Examples of surface temperature sensors for directly measuring the temperature of an object to be measured, which are brought into contact with the surface, include Japanese Utility Model Application Laid-Open No. 57-201940, Japanese Patent Application Laid-Open No. 54-62877, and Japanese Utility Model Application No. 58-1983.
-28195 has been proposed. However, these are all for measuring the temperature of the surface of the object to be measured at rest, and when contacting with a moving object, the temperature-sensitive part does not abut exactly on the surface, and it corresponds to the measurement of the surface temperature. You cannot do it.

On the other hand, as a direct contact type surface temperature sensor for measuring the surface temperature of a moving object, for example, Japanese Patent Publication No. 54-185
No. 80 has been proposed. According to the present invention, a contact plate in which a thin metal plate is formed in a substantially U-shape is attached to a fixture so as to be vertically movable, and furthermore, the top of a semi-circular thermocouple is fixed to a central portion inside the contact plate, and the contact plate is fixed. A spiral spring having a support rod inserted therein is provided on the side of the inner thermocouple.

[0004]

The surface temperature sensor has a structure in which the contact plate is supported so as to be movable up and down, and the back surface is supported by a spiral spring, so that the sensor easily contacts the object to be measured. However, when the object to be measured moves, the U-shaped contact plate is deformed into a rhombus as if the match box were crushed. When the contact plate is deformed in this way, the contact surface at the center of the contact plate rises from the surface of the moving body, and accurate temperature is not transmitted to the temperature measuring unit provided at the center of the contact surface, and the contact is measured. This causes an error in the temperature.

In addition, the surface temperature sensor having this structure has a problem in manufacturing cost due to a large number of parts, and is liable to cause an adjustment error, and it is difficult to manufacture a smaller device.

As another method of measuring the surface temperature of a moving object, there is a method of bringing a temperature sensor close to the surface of the moving object and performing non-contact measurement using infrared radiation of the moving object. However, this measurement method cannot determine the emissivity of the object to be measured, so that it is difficult to accurately measure the temperature. That is, there is a problem that the measured value greatly changes depending on the smoke generated from the measured object and the atmosphere, the degree of surface treatment of the temperature measuring body, the reflectance, the state of the light source illuminating the measured object, and the like. When the object is a moving object, there is a problem that these disadvantages become more remarkable. However, in the case of measuring the temperature of a high-temperature moving object that has a large amount of infrared radiation, this method should be used while knowing that the measurement error is large because there is no other excellent temperature measurement method. It is used as unavoidable to adopt. Under such circumstances, the emergence of a temperature sensor that directly contacts a moving body and measures the surface temperature has been desired.

The present invention has been made to solve the problem of the conventional contact-type temperature sensor for measuring the temperature of a moving surface, and an object of the present invention is to provide a moving object which is an object to be measured. The temperature of the surface can be measured while making contact with the surface of the moving body, so that the contact plate does not rise above the moving body. An object of the present invention is to provide a temperature sensor capable of accurately contacting a contact piece without rising from the surface of the sensor.

It is still another object of the present invention to provide a surface temperature sensor which is hardly broken even when an object to be measured strongly contacts the temperature sensor and has excellent durability.

[0009]

The contact type temperature sensor according to the present invention comprises a temperature measuring element 1 and a supporting member 8 for supporting the temperature measuring element. The temperature measuring element 1 includes a contact plate 2 and a contact plate 2. The contact plate 2 includes a flat contact portion 2a and an engaging portion 2b formed by bending both ends of the contact portion 2a. The auxiliary plate 3 has a contact portion
An elastically deforming portion 3b convexly curved with respect to 2a and a lever portion 3a which is extended by bending the end of this elastically deforming portion 3b, and the end of the elastically deforming portion 3b is connected to the contact surface 2a of the contact plate 2. The sensor body 4 is fixed to the back near the end of the
Are fixed, and the two levers 3a approach each other in a state where the temperature measuring element 1 is incorporated in the support member 8 to deform the elastically deformable portion 3b in the direction in which it extends. It is formed by generating a bending moment.

[0010]

[Operation] When the flat contact portion 2a is assembled into the support member 8 with the lever portions 3a of the two auxiliary plates 3 together, the auxiliary plate 3
The laterally extending force is applied by the elastic deformation portion 3b of the
A bending moment acts to pull up both ends of the contact portion 2a by the leverage generated when raising 3a, thereby applying a tension in its length direction, and as a result,
The central part of the contact part 2a has a shape protruding in a convex shape.

Therefore, even when the contact portion 2a comes into contact with the surface of the device under test 12 and is pushed, the portion provided with the sensor body 4 at the center of the contact portion 2a does not float, and the measurement is accurately performed. Stuff
Temperature can be measured in contact with 12 surfaces.

[0012]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 11 to FIG. 11 show an assembling sequence of the temperature sensor according to the embodiment of the present invention. [Structure of Thermometer] As shown in FIG. 1, a thermometer 1 has a contact plate 2 that forms a friction plate that comes into contact with a temperature measuring object, and a contact plate 2 having one end fixed near both ends of the contact plate 2. It is composed of three auxiliary plates 3. The temperature measuring element 1 is assembled by applying elastic deformation to a support member such as a main body, and is completed.

As shown in FIGS. 1 and 2, the contact plate 2 before being assembled is composed of a flat contact portion 2a and an engagement portion 2b formed by bending both ends of the contact portion 2a into a key shape. And 2
The auxiliary plate 3 is composed of a linear lever portion 3a and an elastically deformable portion 3b formed by bending the end of the auxiliary plate 3 into a J-shape. The tip 3c of the elastically deformable portion 3b is the end of the contact portion 2a. Is fixed by spot welding or the like. A sensor body 4 such as a thermistor is fixed to the center of the back surface of the contact portion 2a.
5a and 5b are drawn out, routed to the vicinity of the tip 3c of the auxiliary plate 3, and extended along the lever 3a.

The "basic design concept" of the thermometer 1 is as follows.
In the assembled state, an arc-shaped or convex lens-shaped bending moment on the contact portion 2a is generated on the positive side. On the other hand, the elastic deformation portion 3b of the auxiliary plate 3 generates a minus side bending moment for flattening the original J shape. By combining the bending moment on the plus side and the bending moment on the minus side in this way, the contact portion 2a that comes into contact with the temperature measuring object always has a convex lens shape. When the contact portion 2a is formed into a convex lens shape by the bending moment, when the contact portion 2a comes into contact with the temperature measuring body and the protruding portion recedes, a force pressing the center portion of the contact portion 2a from both sides acts on the contact portion 2a. That is, it is possible to prevent the central portion from being lifted.

In order to further understand the present invention, the bending moment generated in the temperature measuring element 1 will be additionally described. When assembling the temperature-measuring element 1 in the original form, which has been extended as shown in FIGS. 1 and 2, into the support member 8 (guard), the lever 3 a of the auxiliary plate 3 is connected to the temperature-measuring element 1 as shown in FIG. Are raised in the direction of arrow AA so as to face each other at the center portion. Then, as shown in FIG. 4, the elastically deforming portion 3b bulges in an arc shape toward the contact portion 2a, and generates a force to raise the end of the contacting portion 2a to which the elastically deforming portion 3b is fixed. .

In this case, as shown in FIG. 2, the elastically deforming portion 3b formed in the J-shape is subjected to a bending moment acting to deform in the direction opposite to this deformation, and acts on this elastically deforming portion 3b. An inflection point 3d is formed, and S extends as shown in FIG.
Deforms to a shape close to a letter. As a result, a bending moment is exerted on both ends of the contact portion 2a by the distal end portion 3c of the elastically deforming portion 3b of the auxiliary plate 3 so as to bend the contact plate 2a in a positive side in an arc shape.

FIG. 5 shows a state in which the temperature measuring element 1 is incorporated in a support member (guard) 8, and FIG. 4 is an enlarged view of a main part of the temperature measuring element 1. Although each of these figures is shown, this figure uses a pin support for the sake of explaining the behavior of the temperature measuring element 1. An engagement portion extended to an end of the contact plate 2
2b can be moved upright by the pins 6 erected on the support member 8 while the temperature measuring element 1 is incorporated in the support member 8, but is locked so as not to move downward. Also,
The boundary between the elastically deforming portion 3b and the lever portion 3a is locked by a pin 7. Therefore, by generating a downward force F ₁ to the end portion of the elastic deformation portion 3b by the pin 7. The distance between the center of the contact portion 2a bulging in the shape of an arc and the center of the pin 6 is L _O and Nail. Pin 6,
Reference numeral 7 denotes a member for holding a boundary portion between the engaging portion 2b, the elastically deforming portion 3b, and the lever portion 3a. It is clear that there is good.

The above is the assembling state of the contact type temperature sensor. The actual assembling state will be described with reference to FIGS. 6 to 9. Although there are various types of support members 8 for supporting the temperature measuring element 1, the internal structure of FIG. 6 includes a set of three parts as shown in FIG. The support member 8 has a groove 8a for inserting an engaging portion 2b formed by bending the contact plate 2 at a side portion thereof, and an auxiliary plate 3
And a recess 8c for accommodating the contact portion 2a of the contact plate 2 while allowing the movement of the contact portion 2a. The corner M formed on the convex portion 8d is the pin 6 shown in FIG.
The corners N correspond to the pins 7, respectively.

When the temperature measuring element 1 is fitted to a predetermined position of the lower supporting member 8 as shown in FIG. 7, the pair of supporting members 8 'are combined with the supporting member 8 to obtain the state shown in FIG. Further, a support member 8 ″ is provided on the projection on the back surface of these support members 8, 8 ′.
Is fitted. Then, the holding portion 9 is fixed behind the support member 8 "having a flat back surface to complete the contact-type temperature sensor.

FIG. 10 shows a state in which the assembly is completed. The temperature measuring element 1 is accommodated in a space defined by the concave portions 8c on the front surfaces of the support members 8, 8 ', and the contact plate 2 is formed in an arc shape. And protrude from the tip surface. Since the front surfaces of the support members 8, 8 'are portions that come into contact with the object to be measured, for example, in order to reduce the frictional resistance of at least the portions that come into contact with the object to be measured, for example, heat-resistant materials such as ethylene tetrafluoride resin are used. A surface material made of a certain low friction material is coated or a film-like material is laminated. In particular, a sheet material made of ceramic or polyimide resin may be used as a surface material for use in measuring the surface temperature of an object to be measured at a high temperature.

[Behavior of Thermometer] Next, the deformation state of the thermometer 1 at the time of measuring the temperature configured as described above will be described. As shown in FIG. 10, when the contact portion 2a of the contact plate 2 is brought into contact with the surface of the temperature measuring object 12 as shown in FIG. 8,8 '
8m also contacts the surface of the temperature measuring body 12. Then, the contact portion 2a is pushed into the space portion, and the contact portion 2a is deformed into a state where the center portion is pushed back. When the temperature measuring element 1 is deformed, as shown in an enlarged view in FIG. 12, the arc shape of the contact portion 2a becomes slightly flat, and the curvature of the elastic deformation portion 3b is further increased.

The contact of the contact portion 2a of the contact plate 2 with the object to be measured 12 is achieved by lowering the pins 7 and 6 at the position shown in FIG.
A state of 12, the distance L ₁ between the center of the surface and the pin 6 of the object to be measured 12 would have considerably reduced than the distance L ₀ of the original. In this state, the pin 6 and the engaging portion 2b
Is released, and the pin 7 pushes down the end of the elastically deformable portion 3b of the auxiliary plate 3, that is, the bent portion. When the end of the elastically deformable portion 3b is pressed down by the pin 7, a bending moment acts on the root portion of the tip 3c of the elastically deformable portion 3b, and the elastically deformable portion 3b is deformed so as to pull the contact portion 2a from both sides and to tighten it. Will be.

The pressing force F ₂ in an oblique direction as shown in FIG. 12 generated by the deformation of such a temperature sensing element 1, the component force F
_{In 4} , the contact portion 2 a is pressed against the surface of the temperature measuring object 12. The component force F ₃ is a force pulling from both the contact portions 2a, has given the power to tension the contact portion 2a. By bringing the surface temperature sensor into contact with the temperature measuring object 12 in this manner, the contact portion 2a
It was pressed against the surface of the measured object 12 at a force of F _4, the contact portion 2a
The it is possible to tension the magnitude of F ₃ is generating. Accordingly, it is possible to completely prevent the contact portion 2a provided with the sensor body 4 from being lifted at the center.

FIG. 13 shows a state in which the temperature measuring element 1 is greatly deformed. When the pin 7 is pressed to the surface of the temperature measuring object 12, the elastically deforming portion 3b overlaps the contact portion 2a. Becomes In this case, the contact portion 2a which was originally flat as shown in FIG. 1 has returned to this state. On the other hand, since the auxiliary plate 3 is formed of a J-shaped elastic deformation portion 3b as shown in FIGS. 1 and 2 and a lever portion 3a extending from an end of the elastic deformation portion 3b, the elastic deformation portion 3b It will extend along the contact part 2a. When the pressing force is removed, FIG. 5 or FIG.
State will be restored.

When the temperature measuring element 1 is pressed and deformed by coming into contact with the surface of the object 12 to be measured, the elastically deforming portion 3b of the auxiliary plate 3 and the contacting portion 2a of the contacting plate 2 as shown in FIG. Between the curves a,
The contact points, i.e., the positions where the two plates are stacked, gradually move from the end toward the center, changing sequentially from b and c. As described above, when the elastic deformation portion 3b becomes flat, the rear surface of the contact portion 2a moves upward. When the elastically deforming portion 3b becomes flat as described above, the auxiliary plate 3 acts so as to warp the rear surface of the contact portion 2a upward. This means that the center of the contact portion 2a can accurately contact the surface of the temperature measuring object 12 even when the temperature measuring body 1 is extremely deformed as shown in FIG.

When the temperature measuring element 1 is constructed by combining the contact plate 2 with only the contact portion 2a and an auxiliary plate in which the lever portion 3a, the elastically deforming portion 3b and the engaging portion 2b are integrated. However, substantially the same operation as described above can be achieved.

[0027]

The contact type temperature sensor according to the present invention comprises a temperature measuring element 1 and a supporting member 8 for supporting the temperature measuring element 1. The temperature measuring element 1 is provided on a contact plate 2 and near both ends of the contact plate 2. The contact plate 2 includes a fixed contact portion 2a and engagement portions 2b formed by bending both ends of the contact portion 2a. Is composed of an elastic deformation portion 3b convexly curved with respect to the contact portion 2a and a lever portion 3a extended by bending the end of the elastic deformation portion 3b. The end of the elastic deformation portion 3b is Fix to the back near the end of the contact surface, and
The sensor body 4 is fixed to the back of the central part of 2a, and the two levers 3a are brought close to each other in a state where the temperature measuring body 1 is incorporated in the support member 8 and deformed in the direction in which the elastic deformation part 3b extends. Thereby, a bending moment is generated at both ends of the contact portion 3.

Therefore, the temperature measuring element 1 is significantly flattened, and the engaging members 2b formed at both ends of the contact plate 2 are engaged with the supporting member 8 to move the temperature measuring element 1 laterally. Can be prevented. The deformable portion of the temperature measuring element 1 has a convex lens shape as shown in FIGS. 3 and 5, and the contact portion 2a keeps the convex shape even if it is greatly deformed at the time of temperature measurement. 4 can be accurately applied to the temperature measuring object 12, and the surface temperature can be accurately measured.

Further, since the temperature measuring element 1 can be formed flat, the volume of the space for accommodating the temperature measuring element 1 in the support member 8 can be significantly reduced, and the heat capacity is accordingly reduced. As a result, a sensitive contact temperature sensor can be obtained. Since the temperature sensor is composed entirely of the spring-shaped temperature measuring element 1 and the supporting member 8 that supports the temperature measuring element 1, there is no danger of the temperature measuring element 12 being broken even if it comes into strong contact with the surface of the temperature measuring element 12. Never.

[Brief description of the drawings]

FIG. 1 is a front view of a temperature measuring element to which no external force is applied.

FIG. 2 is an enlarged view showing shapes of a contact plate and an auxiliary plate before elastic deformation.

FIG. 3 is a diagram illustrating a shape of a temperature measuring body when supported by a support member.

FIG. 4 is an enlarged view of a part of the temperature measuring element of FIG. 3;

FIG. 5 is a view showing the shape of a temperature measuring element housed in a support member.

FIG. 6 is a perspective view showing a first stage of an assembling sequence of the contact temperature sensor.

FIG. 7 is a perspective view showing a second stage of the assembling sequence of the contact temperature sensor.

FIG. 8 is a perspective view showing a third stage of the assembling sequence of the contact temperature sensor.

FIG. 9 is a perspective view showing a contact type temperature sensor.

FIG. 10 is a front view showing the internal structure of the contact temperature sensor.

FIG. 11 is a front sectional view showing the behavior of the temperature measuring element brought into contact with the surface of the temperature measuring object.

FIG. 12 is an enlarged view of a main part of FIG. 11;

FIG. 13 is a diagram showing the most deformed shape of the temperature measuring element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Temperature measuring body 2 Contact plate 2a Contact part 2b Engagement part 3 Auxiliary plate 3a Lever part 3b Elastic deformation part 3c
Tip 3d Inflection point 4 Sensor body 6, 7 Pin 8 Supporting member 8a Groove 8b Groove 8c Concave 8d Convex.

Continuation of the front page (56) References JP-A-49-131180 (JP, A) JP-A-54-62877 (JP, A) JP-A-58-28195 (JP, U) JP-A-57-201940 (JP, A) , U) Fully open 1988-39,645 (JP, U) Fully open, 50-2038 (JP, U) Fully open, 60-65650 (JP, U) Japanese Patent Publication 54-18580 (JP, B2) (58) Field surveyed (Int.Cl. ⁶ , DB name) G01K 1/14 G01K 7/02 G01K 13/04

Claims (1)

(57) [Claims] The temperature measuring element comprises a contact plate and two auxiliary plates fixed near both ends of the contact plate. The auxiliary plate has a flat contact portion and an engaging portion formed by bending both ends of the contact portion, and the auxiliary plate has an elastically deforming portion convexly curved with respect to the contact portion, and an elastically deforming portion of the elastically deforming portion. It consists of a lever part that is bent and extended, and the end of the elastically deformed part is fixed to the back near the end of the contact surface of the contact plate, and the sensor body is fixed to the back of the center part of the contact part. The contact-type temperature, in which the two levers approach each other in a state where the temperature measuring element is incorporated in the support member and deforms in the direction in which the elastically deformable portion extends, thereby generating a bending moment at both ends of the contact portion sensor.