JP7013018B2 - Contact thermometer - Google Patents

Description

The present invention relates to a contact thermometer, and more particularly to a contact thermometer capable of measuring the temperature of a temperature subject with high accuracy.

A contact thermometer equipped with a contact plate that comes into contact with the resistance thermometer, a thermocouple that measures the temperature of the contact plate, and multiple pressing rods that press the contact plate toward the resistance thermometer has been proposed. (See, for example, Patent Document 1). In the contact type thermometer described in Patent Document 1, the pressure rod presses the contact plate toward the temperature-measured object to bring the contact plate and the temperature-measured object into surface contact, thereby improving the measurement accuracy. There is.

Japanese Unexamined Patent Publication No. 2010-91310

By the way, in the contact type thermometer described in Patent Document 1, the contact plate that comes into direct contact with the temperature to be measured is made of a metal material having excellent heat soaking property. However, the metal contact plate has a property of extending in the extending direction due to thermal expansion in a high temperature environment. Therefore, in the contact type thermometer described in Patent Document 1, when the contact plate extends in the extending direction due to thermal expansion in a high temperature environment, the contact plate bends due to the extension. Further, when the surface of the temperature to be measured has irregularities, when the contact plate that has been annealed in a high temperature environment comes into contact with the irregularities, the contact surface of the contact plate with the temperature to be measured has irregularities. Local deformation such as dents, warpage, and swells occurs. Such local deformation remains unresolved after the contact with the resistance thermometer is released.

In this way, the bending due to the thermal expansion of the contact plate and the local deformation due to the unevenness of the temperature to be measured, which occur in a high temperature environment, cause a decrease in the contact area between the contact plate and the temperature to be measured, and the temperature is measured. It caused a problem that the response speed became slower and the accuracy became worse.

An object of the present invention is a contact-type temperature for measuring the temperature of a temperature-measured object with high accuracy while suppressing a decrease in the contact area between the contact plate and the temperature-measured object and suppressing a decrease in the response speed of the temperature measurement. To provide a meter.

The contact thermometer for achieving the above object includes a housing, a metal contact plate having a contact portion that protrudes from the housing toward the resistance thermometer and is in direct contact with the resistance temperaturemeter. A thermocouple joined to a surface that does not come into contact with the resistance thermometer at the center of the extending direction of the contact portion, and a pressing mechanism that constantly presses the non-contact surface in one direction from the housing toward the resistance thermometer. In a contact thermometer comprising the It is characterized by a mechanism that keeps it in a taut state at all times.

In the present invention, even if the contact portion expands in the extending direction due to thermal expansion during temperature measurement in a high temperature environment, the contact portion is always maintained in a stretched state by the tension maintaining mechanism. Therefore, according to the present invention, even if the contact plate is stretched due to thermal expansion in a high temperature environment, it is possible to avoid the occurrence of bending due to thermal expansion by keeping the contact plate in a stretched state. Further, according to the present invention, even if the contact plate that has been annealed in a high temperature environment comes into contact with the unevenness of the surface of the temperature to be measured and the contact plate is locally deformed, the contact plate is in contact. By keeping the board taut, the local deformation that occurs can be restored to its original state.

This is advantageous in suppressing the decrease in the contact area between the contact plate and the resistance thermometer according to the present invention, and the contact portion is sufficiently heat-isolated by surface contact with the resistance temperature detector to obtain a temperature. It is possible to measure the temperature of the resistance thermometer with high accuracy while suppressing the decrease in the response speed of the measurement.

It is a perspective view which illustrates the 1st Embodiment of the contact type thermometer of this invention. It is a vertical sectional view illustrating the state of the contact type thermometer of FIG. 1 under no load. It is a vertical cross-sectional view which illustrates the state at the time of temperature measurement of the contact type thermometer of FIG. It is a vertical cross-sectional view which illustrates the state at the time of high temperature temperature measurement of the contact type thermometer of FIG. It is a perspective view which illustrates the 2nd Embodiment of the contact type thermometer of this invention. FIG. 5 is a vertical cross-sectional view illustrating a state of the contact thermometer of FIG. 5 when no load is applied. It is a vertical cross-sectional view which illustrates the state at the time of high temperature temperature measurement of the contact type thermometer of FIG.

Hereinafter, embodiments of the contact thermometer will be described. In the present specification, the X direction in the drawing is the extending direction of the contact portion 31, the Y direction is the width direction of the contact portion 31 orthogonal to the X direction, and the Z direction is the thickness direction of the contact portion 31. do. Regarding the drawings, the dimensions are changed so that the configuration is easy to understand, and the ratio of the thickness, width, length, etc. of each member does not necessarily match the ratio of what is actually manufactured.

As illustrated in FIG. 1, the contact type thermometer 1 of the first embodiment is a device that applies a scientific principle by a thermocouple 10 to convert the temperature of a detected object into an electric signal and measure it. The contact thermometer 1 includes a thermocouple 10, a housing 20, a contact plate 30, a tension maintaining mechanism 40, and a pressing mechanism 50.

As illustrated in FIGS. 2 to 4, the thermocouple 10 is formed in a thin band shape, and has a temperature measuring unit 11 formed by joining dissimilar metals and a signal line 12 derived from the temperature measuring unit 11. Have. The thermocouple 10 is joined to a surface (hereinafter referred to as a non-contact surface) 31a at the center of the contact portion 31 of the contact plate 30 in the X direction where the temperature measuring portion 11 does not contact the temperature-sensitive object, and the signal line 12 is a housing. Derived from the end of 20. The shape of the thermocouple 10 is not particularly limited, and it may be a round wire or the signal wire 12 may be covered with a covering material.

In the thermocouple 10, each of the signal lines 12 led out from the temperature measuring unit 11 toward the outside in the X direction is preferably aligned with the non-contact surface 31a of the contact unit 31 in opposite directions, and the non-contact surface thereof. The total length along 31a is preferably 20 times or more the thickness of the thermocouple 10 in the Z direction. That is, it is preferable that the length of the contact portion 31 in the X direction is also longer than 20 times the thickness of the thermocouple 10 in the Z direction.

The two signal lines 12 pass along the non-contact surface 31a and then pass through the outside of the X-direction end of the retaining portion 27, which will be described later, and are inserted into the signal line through hole 45 formed in the fulcrum member 43. Will be done. Next, after the two signal lines 12 have passed through the signal line through hole 45, an intersection 13 that intersects with each other at least once is formed. Next, the two signal lines 12 are led out from the end of the handle portion 22 to the outside. A play can be provided in the signal line 12 by the intersection 13 formed in the two signal lines 12. This is advantageous for maintaining the signal line 12 in a constantly loosened state even if the contact plate 30 moves in the Z direction, and it is possible to prevent disconnection that occurs when the signal line 12 is in a stretched state. .. In this embodiment, the signal lines 12 derived from the temperature measuring unit 11 are derived along the non-contact surface 31a in the opposite directions in the X direction, but are not directed in the same direction. It may be derived along the contact surface 31a.

The housing 20 is made of a metal such as stainless steel. The housing 20 has a head 21 and a handle portion 22, and the head 21 is composed of an exterior body 23 and an interior body 24. The exterior body 23 has a cylindrical shape with the cylinder axis direction facing in the Z direction, and is cut to face the tip side (the side of the temperature to be measured 2 at the time of measurement) in the cylinder diameter direction (for example, the X direction in the figure). The notch 25 is formed. The interior body 24 is installed inside the exterior body 23 and has a T-shape when viewed in the Y direction, and a thermocouple 10, a contact plate 30, a tension maintaining mechanism 40, and a pressing mechanism 50 are installed inside the interior body 24. Will be done.

The interior body 24 fits into the notches 25 formed in the exterior body 23 at both ends of the upper side portion (the portion extending in the X direction) of the T-shape, and is housed inside the exterior body 23. In the interior body 24, an opening is formed at the upper end of the upper side portion of the T-shape, and the contact portion 31 of the contact plate 30 projects from the opening toward the temperature-measured body 2.

In the interior body 24, heat storage portions 26 are formed at both ends of the upper side portion of the T-shape in the X direction. It is preferable that the heat storage capacity of the heat storage unit 26 is a capacity capable of suppressing the influence of the environmental temperature on at least the tension maintaining mechanism 40 and the pressing mechanism 50 among the various devices installed inside the interior body 24. Further, it is more preferable that the total volume of the heat storage unit 26 is larger than the total volume of the elastic body 41 of the tension maintaining mechanism 40 which is close to each other in the X direction. By providing such a heat storage unit 26, it is advantageous to store heat received from the outside by the heat storage unit 26 at the time of temperature measurement and to make it difficult for the external heat to be transmitted to various devices installed inside the interior body 24. Therefore, the influence caused by external heat can be suppressed. In particular, by arranging the heat storage portion 26 in the vicinity of the elastic body 41, it is advantageous to prevent the elastic force of the elastic body 41 from changing due to external heat. It should be noted that heat storage portions may be provided at both ends of the upper side portion of the T-shape in the Y direction.

In the interior body 24, a retaining portion 27 is formed in the central portion in the X direction inside the upper side portion of the T-shape. The retaining portion 27 functions to indirectly support the contact plate 30 so that the contact plate 30 does not fall off from the housing 20 toward the resistance thermometer. Specifically, the retaining portion 27 functions to come into contact with the tension maintaining mechanism 40 joined to and integrated with the contact plate 30 to support the contact plate 30 via the tension maintaining mechanism 40. A pressing through hole 28 is formed in the center of the retaining portion 27 in the X direction. The pressing through hole 28 is configured so that the support portion 52 of the pressing mechanism 50, which will be described later, can be inserted therethrough. It is preferable that a gap is formed in the retaining portion 27 between both ends in the X direction and the elastic body 41 of the tension maintaining mechanism 40, and the signal line 12 of the thermocouple 10 is derived through the gap formed. ..

The contact plate 30 is a metal strip-shaped plate that protrudes from the housing 20 toward the temperature to be measured and comes into direct contact with the temperature to be measured. Examples of the metal constituting the contact plate 30 include stainless steel and nickel-based alloys. The contact plate 30 has one contact portion 31 and two non-contact portions 32 adjacent to each of both ends of the contact portion 31, and forms a U-shape when viewed in the Y direction. The non-contact portion 32 is erected substantially vertically from the contact portion 31. The length of the non-contact portion 32 in the Z direction may be such that it can be joined to the elastic body 41 of the tension maintaining mechanism 40 described later. The end portion of the contact plate 30 in this embodiment is a non-contact portion 32.

The tension maintaining mechanism 40 is a mechanism that is connected to each of the non-contact portions 32 that are both ends of the contact plate 30 to spread the contact plate 30 in the X direction and keep the contact portion 31 in a constantly stretched state. .. The tension maintaining mechanism 40 has an elastic body 41 composed of a pair of leaf springs, and the elastic body 41 is joined to the non-contact portion 32, and both ends of the contact portion 31 are joined via the non-contact portion 32. It is a mechanism that constantly urges the springs to spread in the direction away from each other (X direction). The tension maintaining mechanism 40 has a force point member 42 and a fulcrum member 43 in addition to the elastic body 41, and when the contact portion 31 of the contact plate 30 tends to extend in the X direction due to thermal expansion, each of the non-contact portions 32. Is a mechanism that puts the contact portion 31 in a stretched state by pushing the contact portion 31 outward from the central portion in the X direction.

The elastic body 41 is composed of a pair of metal leaf springs facing each other in the X direction, and one end portion 41a in the Z direction is directly joined to the non-contact portion 32 which is the end portion of the contact plate 30 and is directly joined in the Z direction. The other end 41b is indirectly fixed to the fulcrum member 43 by the force point member 42. The elastic body 41 is arranged and joined inward in the X direction with respect to the non-contact portion 32. The elastic body 41 may be arranged on the outer side in the X direction with respect to the non-contact portion 32, and in that case, the tension maintaining mechanism 40 is a mechanism for pulling the contact portion 31 to maintain the contact portion 31 at all times.

Further, the elastic body 41 is arranged so that the position of the other end portion 41b in the X direction is closer to the center portion of the contact portion 31 in the X direction than the position of the one end portion 41a in the X direction when viewed in the Y direction. In addition, the elastic body 41 is fixed in a state where the intermediate portion between the one end portion 41a and the other end portion 41b is in contact with the end portion of the fulcrum member 43 in the X direction.

That is, the elastic body 41 is bent and elastically deformed so as to form a convex arc shape outward in the X direction when viewed in the Y direction, and one end portion 41a is joined to the end portion of the contact plate 30. With this configuration, the elastic body 41 faces outward from the central portion in the X direction toward the non-contact portion 32 with the other end portion 41b as the force point, the end portion of the fulcrum member 43 as the fulcrum, and the one end portion 41a as the action point. The fulcrum is always applied.

As the metal constituting the elastic body 41, a nickel-based alloy is exemplified, and as a leaf spring, a laminated leaf spring formed by laminating a plurality of thin plate materials each having elasticity in the X direction is exemplified. To. A thin leaf spring is also exemplified as the leaf spring, but a laminated leaf spring is desirable as the leaf spring because it is easy to increase or decrease the number of leaf springs to obtain a desired elastic force.

The emphasis point member 42 is composed of a pair of metal members having a substantially L-shape. The force point member 42 may have a configuration in which the elastic body 41 can be elastically deformed by applying a force to the other end portion 41b, which is the force point of the elastic body 41. In this embodiment, the force point member 42 is a member that applies a force to the other end portion 41b of the elastic body 41 by indirectly fixing the other end portion 41b of the elastic body 41 to the fulcrum member 43. As the metal constituting the emphasis point member 42, a nickel-based alloy is exemplified as in the elastic body 41.

The fulcrum member 43 is arranged parallel to the contact portion 31 and is composed of a metal plate material extending in the X direction. The fulcrum member 43 has both ends in the X direction in contact with the intermediate portion of the elastic body 41 as fulcrums. The fulcrum member 43 has a pressing through hole 44 formed in the central portion in the X direction and a signal line through hole 45 formed outside in the X direction. The pressing through hole 44 is formed so that the pressing rod of the pressing mechanism 50 described later can be inserted into the pressing through hole 44, and the signal line through term 45 for the signal line is formed so that the signal line 12 of the thermocouple 10 can be inserted through. Both ends of the fulcrum member 43 are in contact with the elastic body 41 in a non-bonded state. As the metal constituting the fulcrum member 43, a nickel-based alloy is exemplified.

In the tension maintaining mechanism 40, one end 41a of an elastic body 41 composed of a leaf spring is joined to each of the non-contact portions 32 which are both ends of the contact plate 30, and the other end 41b is a fulcrum via a force point member 42. By being indirectly joined to the member 43, it is integrated with the contact plate 30. That is, the tension maintaining mechanism 40 is configured to be movable in the Z direction integrally with the contact plate 30, and is moved in the Z direction toward the temperature-controlled body 2 by the retaining portion 27 formed on the interior body 24. Is regulated.

The pressing mechanism 50 is a mechanism that constantly presses the non-contact surface 31a of the contact portion 31 in one direction (downward in the Z direction in the drawing) from the housing 20 in the Z direction toward the resistance thermometer 2. The pressing mechanism 50 has a pressing portion 51, a support portion 52, and an urging portion 53.

The pressing portion 51 is a portion that directly presses the contact portion 31, and has a plurality of metal projecting pieces 54 that project toward the non-contact surface 31a. The plurality of projecting pieces 54 are arranged at both end edges of the non-contact surface 31a in the Y direction so as to be non-contact with the thermocouple 10 arranged at the center of the non-contact surface 31a in the Y direction. Is preferable. Further, it is preferable that the plurality of projecting pieces 54 are arranged at intervals from each other, and it is more preferable that each of the protruding pieces 54 is evenly arranged so as to be able to press the non-contact surface 31a. In the embodiment, a total of six projecting pieces 54 are arranged, three on each of both end edges of the non-contact surface 31a.

The pressing portion 51 comes into contact with the contact plate 30 by a plurality of protruding pieces 54. In this way, by making the total contact area of the plurality of projecting pieces 54 smaller than the pressable region of the non-contact surface 31a surrounded by the plurality of projecting pieces 54, the pressing portion from the non-contact surface 31a. It is advantageous to suppress heat conduction to 51. This makes it possible to measure the temperature of the resistance thermometer 2 with high accuracy by avoiding the temperature drop due to heat conduction that occurs when the temperature of the resistance temperature detector 2 is measured in a high temperature environment.

The support portion 52 is a columnar portion extending in the Z direction inside the interior body 24, and the pressing portion 51 is joined to the end portion on the temperature-measured body side, and the opposite end portion is always connected to the urging portion 53. ,Contact. As described above, the support portion 52 is in a state of being inserted into both the pressing through hole 28 formed in the retaining portion 27 and the pressing through hole 44 formed in the fulcrum member 43.

The urging portion 53 is installed at the lower side portion (a portion extending in the Z direction) of the interior body 24, and the end portion of the support portion 52 can always be urged in the direction toward the temperature-controlled body in the Z direction. It is composed of multiple leaf springs. The urging portion 53 may have a configuration in which the support portion 52 can always be urged in the direction toward the temperature to be measured, and leaf springs, disc springs, and conical springs are exemplified in addition to the laminated leaf springs. ..

The urging portion 53 of the pressing mechanism 50 is preferably separated from the contact portion 31 as much as possible, and the T-shape of the interior body 24 is preferably separated from the contact portion 31 arranged on the upper side portion of the T-shape of the interior body 24. It is more preferable to be arranged in the middle position of the lower side portion. By separating the urging portion 53 from the contact portion 31, it is advantageous to suppress deterioration of the urging portion 53 in a high temperature environment, and it is possible to constantly secure a pressing force for pressing the contact portion 31.

As illustrated in FIG. 2, the contact portion 31 is covered from the head 21 in a state where the measurer grips the handle portion 22 and does not press the contact portion 31 against the resistance temperature detector 2 (when no load is applied). It is pushed out and protrudes toward the temperature measuring body 2 by the pressing of the pressing mechanism 50. At this time, the fulcrum member 43 of the tension maintaining mechanism 40 and the retaining portion 27 formed on the interior body 24 are in contact with each other, and the movement of the fulcrum member 43 is restricted, so that the amount of protrusion of the contact portion 31 from the head 21 is increased. (Height in the Z direction) is limited to a predetermined protrusion amount.

As illustrated in FIG. 3, in an environment where the extension of thermal expansion in the contact plate 30 is relatively short as the operating temperature range, the measurer grips the handle portion 22 and makes the contact portion 31 with respect to the temperature to be measured 2. In the pressed state (during temperature measurement), the contact portion 31 comes into contact with the temperature-measured object 2, and when the pressing force from the measurer becomes larger than the pressing force of the pressing mechanism 50, the contact portion 31 retracts into the head 21. .. At this time, the fulcrum member 43 of the tension maintaining mechanism 40 and the retaining portion 27 formed on the interior body 24 are separated from each other. Further, the contact portion 31 comes into surface contact with the resistance temperature detector 2. When the head 21 comes into contact with the resistance thermometer 2 during temperature measurement, the contact portion 31 also stops retracting into the head 21. That is, the amount of protrusion of the contact portion 31 when there is no load may be a value that allows the head 21 to come into contact with the temperature-measured object 2 at the time of temperature measurement. An environment in which the extension of thermal expansion is relatively short is also an environment in which the contact portion 31 can be maintained in a stretched state.

As illustrated in FIG. 4, in a high temperature environment where the extension of thermal expansion in the contact plate 30 is relatively long as the operating temperature range, the measurer grips the handle portion 22 and the contact portion 31 is the resistance temperature detector 2. In a state of being pressed against the object (during high temperature measurement), the contact portion 31 abuts on the object to be measured 2 and retracts into the head 21, and extends in the X direction (extending direction of the contact portion 31) due to thermal expansion. .. At this time, in the tension maintaining mechanism 40, the elastic body 41 is attached to the non-contact portion 32 which is the end portion of the contact plate 30 with the other end portion 41b as the power point, the end portion of the fulcrum member 43 as the fulcrum, and the one end portion 41a as the action point. An urging force is applied from the central part in the X direction toward the outside. In other words, the tension maintaining mechanism 40 pushes both ends of the contact portion 31 in a direction away from each other via the non-contact portion 32 by the elastic body 41. At this time, the contact portion 31 is extended in the X direction by the amount of thermal expansion, but the tension maintaining mechanism 40 maintains a tense state without bending or loosening.

In the present specification, the state in which the contact portion 31 is stretched means that the tension acts on the contact portion 31 by the tension maintaining mechanism 40, so that the upper end surface or the lower end surface of the contact portion 31 is flat when viewed from the Y direction. It is in a state of becoming. That is, the state in which the contact portion 31 is stretched means a state in which the contact portion 31 is not bent or loosened even if it is extended due to thermal expansion. Further, even if there are irregularities on the surface of the temperature to be measured 2 and local deformations such as bending, warping, and swelling occur temporarily in the contact portion 31 due to the irregularities, the local deformations are eliminated. Indicates the state of returning to the original state. The state of returning to the original state includes not only the state in which the local deformation is completely eliminated but also the state of approaching the original state.

As described above, according to the contact thermometer 1, even if the contact portion 31 expands in the extending direction due to thermal expansion during temperature measurement in a high temperature environment, the tension maintaining mechanism 40 is at the end of the contact plate 30. By constantly applying the urging force of the elastic body 41 to the non-contact portion 32, which is a portion, the contact portion 31 is always maintained in a stretched state. Therefore, according to the contact thermometer 1, even if the contact portion 31 is stretched due to thermal expansion in a high temperature environment, the contact portion 31 is maintained in a stretched state to cause bending due to thermal expansion. It can be avoided. Further, according to the contact thermometer 1, the contact portion 31 which has been annealed in a high temperature environment comes into contact with the unevenness of the surface of the temperature to be measured 2, and the contact portion 31 is locally deformed. Even if it occurs, by keeping the contact portion 31 in a stretched state, the generated local deformation can be restored to the original state.

As a result, according to the contact thermometer 1, it is advantageous to suppress the decrease in the contact area between the contact portion 31 and the temperature-measured object 2, and the contact portion 31 is sufficiently brought into contact with the temperature-measured object by surface contact. The temperature of the resistance thermometer 2 can be measured with high accuracy while soaking the heat and suppressing a decrease in the response speed of the temperature measurement.

In the contact type thermometer 1, the tension maintaining mechanism 40 constantly urges the contact portion 31 by the elastic body 41, so that each time the expansion of thermal expansion progresses in response to a change in the environmental temperature, the contact type thermometer 1 contacts in accordance with the progress. The portion 31 can be pushed open. This is advantageous for always maintaining a stretched state without causing any bending or loosening of the contact portion 31, and avoids the occurrence of bending of the contact plate 30 due to thermal expansion due to a change in the environmental temperature. be able to. In addition, as a side effect, it becomes possible to cope with the elongation of the contact portion 31 due to aged deterioration, which is advantageous for improving the durability.

The contact type thermometer 1 can reduce the amount of heat transfer from the non-contact surface 31a to the pressing mechanism 50 by reducing the contact area between the pressing portion 51 and the non-contact surface 31a. This is advantageous for suppressing the temperature change of the resistance thermometer 2 at the time of temperature measurement.

Further, in the contact type thermometer 1, by arranging the urging portion 53 of the pressing mechanism 50 at a position away from the contact portion 31, it is possible to avoid a decrease in pressing pressure due to deterioration of the urging portion 53 due to the influence of a high temperature environment. Will be advantageous.

In addition, the contact thermometer 1 stores heat received from the outside by the heat storage unit 26 at the time of temperature measurement by arranging the heat storage unit 26 of the interior body 24 in the vicinity of the elastic body 41 of the tension maintenance mechanism 40. It is advantageous to make it difficult for external heat to be transmitted to various devices installed inside the interior body 24, and it is possible to suppress the influence caused by the external heat. In particular, by arranging the heat storage portion 26 in the vicinity of the elastic body 41, it is advantageous to prevent the elastic force of the elastic body 41 from changing due to external heat.

In general, the contact thermometer 1 can measure the temperature of the temperature to be measured 2 with high accuracy by suppressing the occurrence of a factor of deterioration of measurement accuracy in a high temperature environment.

As illustrated in FIG. 5, the contact thermometer 1 of the second embodiment is a thermometer that measures the temperature of the resistance temperature detector 3 that moves from the left side to the right side in the X direction with respect to the first embodiment. be. Examples of the resistance temperature detector 3 whose surface moves in the present specification include an iron plate in the manufacturing process.

As illustrated in FIGS. 6 and 7, in the thermocouple 10, the temperature measuring unit 11 is joined to the non-contact surface 31a at the center of the contact portion 31 of the contact plate 30 in the X direction, and the signal lines 12 are connected to each other in the X direction. It is derived along the non-contact surface 31a in the same direction. As in the first embodiment, it is preferable that the total length of the thermocouple 10 along the non-contact surface 31a of the signal line 12 is 20 times or more the thickness of the thermocouple 10 in the Z direction.

The housing 20 is made of a metal such as stainless steel as in the first embodiment, and has a head 21 and a handle portion (not shown). The head 21 has a T-shape when viewed in the Y direction, a pair of heat storage portions 26 are arranged apart from each other in the Y direction, and a contact plate 30 is arranged between the heat storage portions 26. It is formed in a U-shape that opens upward when viewed in the X direction. The head 21 may be provided with a guard member made of a fluororesin having a low frictional resistance on the surface of the heat storage unit 26 on the side of the resistance thermometer 3. Further, in order to facilitate the sliding of the resistance temperature detector 3 in the X direction, the head 21 has a part of the resistance temperature meter 3 projected on the outer surface of the four corners of the head 21. Rollers may be attached.

The head 21 of this embodiment has a fixing member 61, a first pulley 62, a second pulley 63, and a third pulley 64. The fixing member 61 and the first pulley 62 are arranged on the upstream side with respect to the moving direction of the resistance thermometer 3, and the second pulley 63 and the third pulley 64 are arranged on the downstream side. Further, the first pulley 62 and the second pulley 63 are arranged on the tip end side of the T-shaped upper side portion of the head 21, and the fixing member 61 is located on the terminal side of the T-shaped upper side portion of the first pulley 62. The pulley 64 is arranged on the terminal side of the upper side portion of the T-shape with respect to the second pulley 63, respectively.

The fixing member 61 is a member suspended from the inner wall surfaces of the heat storage portions 26 facing each other to fix one end 30a of the contact plate 30 to the head 21. The fixing member 61 may be integrally formed with the head 21.

The first pulley 62 and the second pulley 63 are pulleys that are spaced apart from each other in the X direction and the connecting portions of the contact portion 31 and the non-contact portion 32 of the contact plate 30 are hung around. The first pulley 62 and the second pulley 63 come into contact with the inner surface of the contact plate 30 including the non-contact surface 31a. In the first pulley 62 and the second pulley 63, the rotation shaft is pivotally supported by the elongated hole 65 formed in the inner wall surface of the heat storage portion 26. The elongated hole 65 extends in the longitudinal direction in the Z direction. The first pulley 62 and the second pulley 63 are configured to be movable in the Z direction by the rotation shaft being pivotally supported by the elongated hole 65. The first pulley 62 is arranged at the end of the X-direction end of the head 21 on the side where the signal line 12 of the thermocouple 10 exists, and the second pulley 63 is at the opposite end. Be placed.

The third pulley 64 is a pulley whose position is fixed and the non-contact portion 32 having the other end 30b of the contact plate 30 is hung around, and comes into contact with the outer surface of the contact plate 30. The third pulley 64 has a function as an idler that changes the direction of the portion of the non-contact portion 32 that is hung up to the other end 30b and extends the portion in the Z direction. By extending the non-contact portion 32 including the other end 30b in the Z direction by the third pulley 64, the tension maintaining mechanism 40 connected to the other end 30b can be accommodated in the lower side portion of the T-shape of the head 21. become.

Each of the first pulley 62, the second pulley 63, and the third pulley 64 is made of a material other than metal and whose cord ring in contact with at least the contact plate 30 among the members constituting the pulley is not melted in a high temperature environment. Is preferable. Examples of such a material include ceramics such as silicon nitride. Since each of the first pulley 62, the second pulley 63, and the third pulley 64 is made of ceramics, it is advantageous to prevent each pulley from melting even when used in a high temperature environment. This makes it possible to prevent each pulley and the contact plate 30 from being fixed to each other by melting joint. The rotating shaft of the members constituting the pulley may be made of a metal such as stainless steel because it does not come into contact with the contact plate 30.

In the first pulley 62, a groove 66 in which the signal line 12 is arranged is formed in the central portion in the Y direction. The groove 66 is formed by recessing the central portion of the rope ring in the Y direction from the outside in the radial direction to the inside over the entire circumference of the rope ring of the first pulley 62. The groove 66 may have a structure in which the signal line 12 of the thermocouple 10 is hung around.

In the contact plate 30, one end 30a is fixed to the head 21 via a fixing member 61, and the connecting portion of the contact portion 31 and the non-contact portion 32 is hung around the first pulley 62 and the second pulley 63, and the third pulley The other end 30b via the 64 is connected to the tension maintaining mechanism 40. In other words, in the contact plate 30, one end 30a on the upstream side is fixed to the head 21 and the other end 30b on the downstream side is connected to the tension maintaining mechanism 40 in the moving direction of the resistance thermometer 3.

The tension maintaining mechanism 40 is a mechanism that is arranged at the lower side portion of the T-shape of the head 21, is connected to the other end 30b of the contact plate 30, and pulls the contact portion 31 to maintain the tension at all times. The tension maintaining mechanism 40 has an elastic body 41 composed of a conical spring (also referred to as a volute spring), and the elastic body 41 is joined to a non-contact portion 32 having the other end 30b via a connecting member 46. This is a mechanism that constantly urges the non-contact portion 32 so as to pull it in the Z direction. The tension maintaining mechanism 40 pulls the non-contact portion 32 having the other end 30b from the lower side to the upper side in the Z direction when the contact portion 31 of the contact plate 30 tries to extend in the X direction due to thermal expansion. , A mechanism that keeps the contact portion 31 in a stretched state.

The elastic body 41 is composed of a conical spring formed by winding a metal plate material in a conical shape from the lower bottom in the Z direction toward the upper top, the bottom is fixed to the head 21, and the top is a connecting member. It is joined to one end of 46. The connecting member 46 may be any as long as it can connect the elastic body 41 and the contact plate 30, and its shape and structure are not particularly limited. In this embodiment, since the elastic body 41 is composed of a conical spring, the connecting member 46 is formed in a columnar shape that can be joined to the apex while being inserted from the bottom of the conical spring toward the apex. The elastic body 41 may be a spring that expands and contracts in the Z direction, and may be a tension coil spring. Further, as the metal constituting the elastic body 41, a nickel-based alloy is exemplified.

Similar to the first embodiment, the pressing mechanism 50 always makes the non-contact surface 31a of the contact portion 31 in one direction (downward in the Z direction in the figure) from the housing 20 in the Z direction toward the resistance thermometer 3. It is a pressing mechanism. In the pressing mechanism 50 of this embodiment, it is preferable that at least the pressing portion 51 is made of a material other than metal and which does not melt in a high temperature environment (for example, ceramics such as silicon nitride). Since the pressing portion 51 is made of ceramics, it is advantageous to prevent the pressing portion 51 from melting even when used in a high temperature environment. This makes it possible to prevent the pressing portion 51 and the contact plate 30 from being fixed to each other by melting joining.

As illustrated in FIG. 6, in a state where the measurer grips a handle portion (not shown) and does not press the contact portion 31 against the resistance temperature detector 2 (when no load is applied), the contact portion 31 is from the head 21. It is pushed out and protrudes toward the resistance thermometer 3 by the pressing of the pressing mechanism 50. At this time, each rotation axis of the first pulley 62 and the second pulley 63 moves to one end (lower end in FIG. 6) of the elongated hole 65.

As illustrated in FIG. 7, in a high temperature environment as an operating temperature range, a state in which the measurer grips a handle portion (not shown) and presses the contact portion 31 against the resistance temperature 3 (during high temperature measurement). In the contact portion 31, the contact portion 31 comes into contact with the resistance thermometer 3, and when the pressing force from the measurer becomes larger than the pressing force of the pressing mechanism 50, the contact portion 31 retracts into the head 21 and is thermally expanded in the X direction (contact). It extends in the extending direction of the portion 31). As the resistance temperature detector 3 moves from the left side in the X direction to the right side in the drawing, the contact portion 31 extends in the direction from the left side to the right side in the X direction due to thermal expansion. At this time, the other end 30b of the contact plate 30 is pulled up from the lower side in the Z direction to the upper side via the connecting member 46 by the urging force acting by the tension maintaining mechanism 40. In other words, the tension maintaining mechanism 40 pulls the downstream end of the contact portion 31 with respect to the moving direction of the resistance thermometer 3 via the non-contact portion 32. The contact portion 31 tends to be stretched longer in the Z direction due to thermal expansion, but the tension maintaining mechanism 40 pulls up the other end 30b of the stretched contact plate 30, so that a stretched state without bending or loosening is maintained. To. For example, assuming that the position of an arbitrary portion of the contact portion 31 in a situation where thermal expansion does not occur is P1 and the position of that portion in a situation where thermal expansion occurs is P2, the position P2 is compared with the position P1. It is moving to the right in the X direction in the figure. This amount of movement is the amount of extension of the contact portion 31 due to thermal expansion.

As described above, according to the contact thermometer 1, it is advantageous for the contact portion 31 to be in surface contact with the temperature to be measured 2 even in a high temperature environment as in the first embodiment, and the contact portion 31 is used. It is possible to measure the temperature of the temperature-measured object 2 with high accuracy while sufficiently soaking the heat so as to suppress a decrease in the response speed of the temperature measurement.

The contact type thermometer 1 measures high temperature by forming a member in contact with the contact plate 30 other than the tension maintaining mechanism 40 connected to the end of the contact plate 30 with a material other than metal and which does not melt in a high temperature environment. It is advantageous to prevent the contact plate 30 and the member in contact with the contact plate 30 from melting and joining when the temperature is high.

Further, in the contact thermometer 1, the end portion of the contact plate 30 located on the upstream side with respect to the moving direction of the temperature to be measured body 3 is fixed to the head 21, and the tension maintaining mechanism 40 is provided only on the end portion located on the downstream side. It is a configuration that exerts the urging force of. Therefore, when the expansion of the thermal expansion of the contact portion 31 is limited to one direction due to the movement of the resistance thermometer 3, the expansion of the thermal expansion of the contact portion 31 can be increased by configuring the contact portion 31 without going against the expansion direction. The contact portion 31 can be maintained in a stretched state without being hindered.

When the tension maintaining mechanism 40 is configured by a mechanism for pulling the contact plate 30 as in the contact type thermometer 1 of the second embodiment, a plurality of pulleys are used to determine the direction in which each part of the contact plate 30 extends. Adjusting it is advantageous for increasing the degree of freedom in design. In particular, it is suitable when it is difficult to secure an installation space for each device in a direction other than the Z direction, such as the contact type thermometer 1.

The contact type thermometer 1 of the above-described embodiment has a configuration in which the contact portion 31 is maintained in a stretched state even if the contact portion 31 extends in the extending direction due to thermal expansion. Specifically, the contact type thermometer 1 of the first embodiment illustrated in FIGS. 1 to 4 has a configuration in which the tension maintaining mechanism 40 expands the contact portion 31, and the second embodiment illustrated in FIGS. 5 to 7 is performed. The contact type thermometer 1 of the form has a structure in which the tension maintaining mechanism 40 pulls the contact portion 31. In the present specification, the configuration for expanding the contact portion 31 is such that the tension maintaining mechanism 40 exerts an urging force on the contact plate 30 so as to expand the contact portion 31. Further, the structure for pulling the contact portion 31 is such that the tension maintaining mechanism 40 exerts an urging force on the contact plate 30 so as to pull it. That is, in either configuration of the first embodiment or the second embodiment, tension acts on the contact portion 31 in the direction from the central portion in the X direction toward the outside, and the contact portion 31 is always in a stretched state. Become sustainable.

The tension maintaining mechanism 40 is limited to the configuration of the described embodiment as long as the contact portion 31 can be kept in a tensioned state at all times. For example, the elastic body 41 of the first embodiment may be composed of a compression coil spring interposed between one non-contact portion 32 and the other non-contact portion 32, and the interior body 24 and the non-contact portion 32 may be configured. It may be composed of a tension coil spring intervening between them. Further, one end 30a of the contact plate 30 of the second embodiment may be pulled by the same tension maintaining mechanism 40.

In the above-described embodiment, the shape of the housing 20 is not particularly limited, and for example, the handle portion 22 may be formed linearly or may be bent at an intermediate position of the handle portion 22. .. Further, in the first embodiment, the exterior body 23 of the head 21 may not be provided.

1 Contact type thermometer 10 Thermocouple 20 Housing 30 Contact plate 40 Tension maintenance mechanism 50 Pressing mechanism

Claims (5)

A housing, a metal contact plate having a contact portion that protrudes from the housing toward the thermometer and comes into direct contact with the thermometer, and a measurement at the center of the contact portion in the extending direction. In a contact thermometer provided with a thermocouple joined to a surface that does not come into contact with a warm body, and a pressing mechanism that constantly presses the non-contact surface in one direction from the housing toward the resistance thermometer.
A tension maintaining mechanism connected to at least one end of the contact plate is provided, and the tension maintaining mechanism is a mechanism for pulling or expanding the contact plate to keep the contact portion in a constantly stretched state. A contact type thermometer characterized by that. The contact according to claim 1, wherein the tension maintaining mechanism has an elastic body, and the elastic body is joined to an end portion of the contact plate and constantly urged to pull or expand the end portion. Formula thermometer. The tension maintaining mechanism has a pair of leaf springs facing each other in the extending direction as the elastic body, and the pair of leaf springs constantly pulls the contact plate in a direction in which both ends of the contact portion are separated from each other. The contact type thermometer according to claim 2, which is configured to be expanded. The contact plate has a non-contact portion that is in contact with the contact portion and is not in contact with the resistance thermometer, and the contact portion and the joint portion of the non-contact portion are wound around a pulley.
The tension maintaining mechanism is configured such that the elastic body pulls the end portion of the non-contact portion, which is the end portion of the contact plate, and maintains the contact portion in a constantly stretched state via the non-contact portion. Item 2. The contact type thermometer according to Item 2. One of claims 1 to 4, wherein the pressing mechanism has a plurality of metal projecting pieces that project toward the non-contact surface, and each of the projecting pieces is arranged in a non-contact manner with respect to the thermocouple. The contact type thermometer according to item 1.

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