JP2008190916A - Contact-type thermometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact-type thermometer capable of bringing a contact plate having a small area into surface contact with the surface of a temperature measuring object, and having superior responsiveness during measurement. <P>SOLUTION: This contact type thermometer 1 has a temperature-measuring part 11a for measuring the temperature of the temperature measuring object 50, the contact plate 12 for performing heat transfer between the temperature measuring object 50 and the temperature-measuring part 11a by being pressed against the surface of the temperature measuring object 50, and a pressing member 40 for generating an energizing force for pressing the contact plate 12 onto the temperature measuring object 50. The thermometer 1 has a constitution, wherein the temperature measuring part 11a is arranged on the contact plate 12, and a clearance is provided in between the contact plate 12 and a contact barrel 14; the contact plate 12 is bonded to the contact barrel 14 by a strut 13, provided on the contact plate 12; and the contact barrel 14 is pressed by the pressing member 40, to thereby press the contact plate 12 against the temperature measuring object 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a contact-type thermometer that directly contacts a temperature measurement object and measures the temperature.

  As a thermometer that measures the surface temperature of an object (temperature object) for temperature measurement, there is a contact thermometer that measures the temperature by directly contacting the surface of the temperature object. This contact-type thermometer is configured so that a temperature measuring unit (temperature sensing unit) such as a thermocouple is brought into contact with the surface of the temperature-measured body via the contact plate, but uses the elastic deformation force of the contact plate itself. An elastic contact plate type that presses the back of the contact plate in combination with an elastic contact plate type that presses the contact plate against the temperature-measured body and an elastic body (pressing member) that generates a pressing force There are things.

  In this elastic contact plate type, the contact plate is formed of a U-shaped elastic frame, and the central portion of the contact plate is brought into contact with the temperature-measured body, and the dish-shaped contact plate is attached to the tip of the hollow cylinder. The center part of this dish is brought into contact with the temperature measuring body (for example, refer to Patent Documents 1 and 2).

  In the elastic body pressing type, the auxiliary plate with the lever is fixed near both ends of the contact plate, and the bending force is generated at both ends of the contact plate by the elastic force of the auxiliary plate, and the sensor body is fixed to the back surface. The center part of the contact plate bulges in a convex shape, or the support bar is loosely fitted in the long guide hole so that both ends of the contact plate are movably held. (See, for example, Patent Documents 3, 4, and 5).

  In addition, it has a temperature sensing part on the back and is supported by the case body so that it can move in the direction perpendicular to the contact surface at both ends of the contact plate that contacts the temperature sensing object, and the temperature sensing part is surrounded by the pressing means. A contact-type temperature sensor that presses the contact surface at three or more points has also been proposed (see, for example, Patent Document 6).

  However, depending on the purpose of use, the measurement part is small, or there is a change in temperature, and quick responsiveness is required at the time of measurement, which limits the heat capacity of the contact plate, etc., and the area of the contact plate cannot be increased There is a case. In such a small contact temperature sensor, it is necessary to reduce the area of the contact plate, and accordingly, it is also necessary to reduce the pressing means for pressing the contact plate against the temperature measurement object. In this case, since the contact plate is small, an indentation is generated in the temperature-measuring body when the pressing force is large at the time of measurement. Therefore, it is necessary to accurately bring the contact plate into surface contact with the temperature-measuring body with a small pressing force.

Japanese Utility Model Publication No. 57-201940 Japanese Utility Model Publication No. 58-28195 Japanese Patent No. 2979264 Japanese Patent Laid-Open No. 10-318864 JP 2003-83817 A JP 2005-315591 A

  The present invention has been made in order to solve the above-described problems, and the purpose of the present invention is to allow a contact plate having a small area to be in surface contact with the surface of the temperature-measured body accurately and to respond to measurement. It is to provide an excellent contact thermometer.

  To achieve the above object, the contact-type thermometer of the present invention includes a temperature measuring unit for measuring the temperature of the temperature-measuring object, and the temperature-measuring object and the measurement object pressed against the surface of the temperature-measuring object. In a contact-type thermometer having a contact plate that transfers heat to and from the temperature unit, and a pressing member that generates a biasing force that presses the contact plate against the temperature-measured body, the temperature measurement unit is in contact with the temperature measurement unit The contact plate is disposed on the plate, a gap is provided between the contact plate and the contact piece, the contact plate is coupled to the contact piece by a support provided on the contact plate, and the contact piece is pressed by the pressing member. By this, it is comprised so that the said contact plate may be pressed to a to-be-measured body.

  According to this configuration, since a gap is provided between the contact plate and the contact piece and the contact plate and the contact piece are coupled by the support column, the cross-sectional area of the heat transfer from the contact plate to the contact piece can be reduced. And the amount of heat transfer can be reduced. Further, in order to reduce the thermal influence from the support column on the temperature measurement unit, it is preferable to provide the temperature measurement unit and the support column as far as possible. For example, the temperature measurement unit is provided in the center portion of the contact plate, and the support column is provided on the contact plate. Arrange at the periphery.

  In addition, since the contact plate is preferably pressed with a plurality of support columns indirectly through the contact piece without directly pressing the contact plate with the pressing member, the pressing force is equalized and the structure of the contact plate is simplified. Can be In addition, since the rigidity of the contact plate can be strengthened by providing the support plate at the periphery of the contact plate, the area of the contact plate can be reduced and the thickness can be reduced, and the portion directly in contact with the temperature measurement object It becomes possible to reduce the heat capacity of a certain contact plate.

  Furthermore, the struts are arranged point-symmetrically with respect to the center of the contact plate, are arranged symmetrically with respect to a straight line passing through the center of the contact plate, or pass through the center of the contact plate and are orthogonal to each other. By arranging them symmetrically with respect to the contact plate, the rigidity of the contact plate can be equalized, and the contact plate can be more evenly pressed by the support column to prevent torsional deformation of the contact plate. Thus, the surface of the contact plate can be more accurately brought into contact with the temperature measurement object.

  In the above contact-type thermometer, the head in which the temperature measuring unit, the contact plate, the support column, and the contact piece are integrated is configured to freely swing freely in a cylindrical guide member. Then, the heat transfer between the head and the outside, particularly radiant heat transfer, can be reduced by the guide member that covers the head. In addition, since there is a loose fit, that is, in a state where there is play, in other words, there is a gap between the fitted head and the fitted guide member, so the head and the guide The area in contact with the member becomes very small, and the heat transfer between the head and the guide member can be reduced.

  Moreover, since the head is inside the guide member, the head can be protected by the guide member. Moreover, the head can be swung freely so that the contact plate can be brought into surface contact with the temperature-measuring body accurately even if the relative angle between the temperature-measuring body and the guide member changes somewhat. The free swinging of the head means that the relative angular relationship between the head and the guide member can be changed within a predetermined range. For example, when the guide member is arranged in the vertical direction (vertical direction: Z direction), the head is vertically oriented within a range of all directions or a predetermined direction with respect to the horizontal direction (front and back, left and right: directions in the XY plane) from the downward direction. It can be tilted within a predetermined angle range. Thereby, a contact plate can incline with respect to a perpendicular direction within the range of a predetermined angle.

  In addition, if the head can swing freely and the pressing force exceeds a predetermined size, it can be moved in the pressing direction within a predetermined range, so that excessive pressing force is applied to the temperature measurement object. Can be prevented.

  Further, if the head is made an independent component and is detachably attached to the guide member, only the head needs to be replaced when dealing with repairs or special applications, so that a flexible response can be made.

  In the contact-type thermometer, when the pressing member is configured to press one point of the contact piece, the contact area between the pressing member and the contact piece is very small because the pressing is performed at one point. The heat transfer between the member and the contact piece can be reduced. Therefore, the pressing member is not necessarily required to have heat resistance, so that a wider range of materials and existing instruments can be used. Moreover, since the magnitude | size does not press a contact plate directly, it becomes comparatively free.

  In addition, since the influence that the swing of the contact piece is restricted by the pressing of the pressing member can be reduced, the contact plate can be accurately brought into surface contact with the temperature measurement object. In addition, what can be pressed at this one point includes a spring pin (spring probe, contact pin) used for electrical circuit continuity and function inspection. Furthermore, it is more preferable that the point at which the pressing member presses the contact piece is set at the center of gravity of the head, because the head is not inclined by the pressing.

  In the contact-type thermometer, the contact piece is clamped by a holding member having a clamping portion that protrudes from the support member and is arranged in a pair, and the contact plate is covered by the locking member of the clamping portion. If the contact piece is constrained so that it does not move beyond a predetermined position with respect to the direction to move to the temperature measuring element side, the contact piece is clamped by the clamping part. By sliding the contact piece and the holding member, it is possible to move in the in-plane direction, and swinging in this in-plane direction is also possible. In addition, the contact piece can be prevented from moving beyond a predetermined position by the locking member, and the position of the movement limit of the contact plate toward the temperature-measured body can be easily set by setting the position of the locking member. it can.

  Furthermore, when a gap is provided between the contact piece and the support member and the holding part of the holding member is formed so as to bend elastically in a direction perpendicular to the surface, not only the in-plane direction of the holding part, It can also be moved and swung in the bending direction. Therefore, according to this configuration, movement in each direction and swinging can be easily performed, and the contact plate can be in surface contact with the surface of the temperature-measuring body more accurately.

  Alternatively, in the contact-type thermometer, the contact piece is loosely fitted inside the guide member, and a through-hole is provided in the contact piece in a direction perpendicular to the pressing direction of the pressing member. When the support bar inserted in the fitted state is fixed to the guide member in a direction perpendicular to the pressing direction of the pressing member, and the contact piece is swingably supported by the support bar, the contact piece is idled by the support bar. Since the contact portion between the contact piece and the support bar becomes small because the support is supported in the fitted state, the amount of heat transfer between the contact piece and the support bar can be reduced. In addition, since the contact piece can be easily moved within a predetermined position by the size of the through hole and the thickness of the support bar, the movement limit of the contact plate can be reduced by the size of the through hole and the support bar. Can be easily set according to thickness. Therefore, the head can be easily swung and moved in each direction, so that the contact plate can be brought into surface contact with the surface of the temperature-measuring body more accurately.

  Also, by making the through hole not elliptical but elliptical, the amount of movement in the pressing direction and the amount of movement in the direction perpendicular to the axial direction of the through hole can be made different. The diameter of the swing angle and the amount of movement can be individually set by expanding or reducing the diameter on both sides.

  According to the contact-type thermometer of the present invention, the heat transfer from the contact plate on which the temperature measuring unit is arranged can be reduced, and the contact plate is accurately brought into contact with the surface of the temperature-measured body by surface contact. Therefore, the size of the contact plate can be reduced to reduce the heat capacity, and the responsiveness during measurement can be improved.

  Next, embodiments of the present invention will be described with reference to the drawings. For easy explanation, XYZ orthogonal coordinates are provided.

  As shown in FIGS. 1 to 6, the contact thermometer 1 according to the first embodiment of the present invention includes a head 10, a support member 20, and a guide member 30, and the head 10 includes the support member 20. The guide member 30 is accommodated together with the support member 20 while being supported by the guide member 30.

  First, the head 10 will be described. As shown in FIG. 1 to FIG. 3 and FIG. 5, the head 10 includes an ultrafine thermocouple 11, a contact plate 12, a support 13, and a contact piece 14. The thermocouple 11 is formed of a very thin thermocouple having a diameter of, for example, about 0.1 mmφ, and the heat capacity of the thermocouple 11 is reduced, thereby reducing the influence of heat on the temperature measurement target 50. The temperature measuring unit 11a, which is a thermal contact point of the thermocouple 11, is disposed at the center (for example, the position of the center of gravity) of the contact plate 12, and is fixed by spot welding or adhesion. The thermocouple wires 11 b and 11 c of the thermocouple 11 are guided along the contact plate 12 to the peripheral side of the contact plate 12. At this time, if the thermocouple wires 11b and 11c of the thermocouple 11 are separated from the contact plate 12, the radiant heat transfer from the thermocouple wires 11b and 11c becomes large and causes a measurement error. Therefore, the thermocouple wires 11b and 11c Are brought into contact with the contact plate 12 while maintaining an insulating state.

  The contact plate 12 is provided in parallel to the XY plane, and has a role of contacting the temperature measurement object 50 and transferring heat to the temperature measurement unit 11 a of the thermocouple 11. The contact plate 12 is a nickel-based metal having elasticity and heat resistance to reduce deformation during measurement, and is formed into an extremely thin planar body of about 0.3 mm to 0.05 mm. The contact plate 12 is finished to have a flat surface or a surface shape along the surface of the temperature-measuring object 50, and improves the heat absorption rate from the object-to-be-measured 50 by increasing the adhesion. That is, by using a metal processed into a plate shape (planar shape) for the contact plate 12, the contact area is ensured, and the heat transfer between the temperature-measuring body 50 is efficient due to the metal material having high thermal conductivity. Try to do it well.

  The contact plate 12 has a small plate thickness and a small area to reduce the heat capacity. As a result, the amount of heat received from the temperature-measured body 50 is reduced, the heat from the temperature-measured body 50 is received, and the temperature is instantaneously the same as that of the temperature-measured body 50, thereby improving the responsiveness during temperature measurement. Thereby, the responsiveness of temperature measurement is improved, and the influence of heat on the measured object 50 due to temperature measurement on the measured temperature object 50 side is reduced.

  In addition, although the shape depends on the relationship with the support columns 13, it is usually formed according to the number of support columns 13. When the number of support columns 13 is four, it is formed in a square or a circle. Regarding the size of the contact plate 12, for example, it is formed in a square having a side of 2 mm to 4 mm or a circle of 2 mmφ to 4 mmφ, for example.

  A plurality of support columns 13 are arranged so as to extend in the Z direction, and have a role of supporting the contact plate 12 and fixing the contact plate 12 to the contact piece 14. The support column 13 is made of a thin plate such as stainless steel in order to reduce the heat capacity to improve the responsiveness of temperature measurement and to reduce heat transfer and heat dissipation. The support column 13 is fixed to the contact plate 12 by welding, adhesion, or the like, and the contact plate 12 is supported by the peripheral portion of the contact plate 12 so that the surface of the contact plate 12 is separated from the contact piece 14 by a certain distance. Keep in state. The support column 13 for fixing the contact plate 12 is installed on the peripheral edge as far as possible from the temperature measuring unit 11a in order to reduce the thermal influence on the temperature measuring unit 11a.

  Further, the support column 13 is arranged in a point object with respect to the center of the contact plate 12 so that the position of the support column 13 is uniform with respect to the center, whereby deformation such as twisting of the contact plate 12 is performed. It becomes a stable support method that decreases. Considering the movement of the contact plate 12 with respect to the temperature-measured body 50, three or more support columns 13 are used to ensure stability by providing a certain distance from the center, and to provide a certain thickness, and against external force. Although it is configured so as to have resistance, it is more preferable that the number of the support columns 13 is four because it is easy to work.

  The contact piece 14 is made of metal or the like. The contact piece 14 is preferably formed in a prism having the same shape as the contact plate 12, for example, a cylinder or a regular quadrangle, but may be a prism having a shape different from that of the contact plate 12, and is not necessarily a prism. There is no need to be. In short, it is sufficient that the contact plate 12 can be supported by the support column 13 and can be smoothly swung and moved inside the guide member 30 as described later. The contact piece 14 supports the contact plate 12 on the lower side by providing a gap through the support column 13, that is, with a distance.

  In this embodiment, the contact piece 14 is formed in a prismatic shape extending in the Z direction, and the support column 13 is fixed to the flat portion 14c on the side surface of the contact piece 14 by spot welding or the like. At this time, the bottom surface of the contact piece 14 and the contact plate 12 are assembled so as to be parallel. That is, the contact plate 12 and the contact piece 14 are integrated parts that are maintained in parallel during measurement. With this configuration, the heat radiation surface of the contact plate 13 and the heat radiation surface of the contact piece 14 face each other, so that the heat transfer of the radiant heat transfer is performed between the contact plate 13 and the contact piece 14. Therefore, there is little heat transfer from the contact plate 13 to the guide member 30.

  Further, in order to reduce the amount of heat transfer from the support columns 13, the total cross-sectional area of each support column 13 is set to an appropriate range compared to the area of the contact plate 12. The smaller the cross-sectional area of the support column 13 is, the smaller the heat conduction and heat dissipation are. However, since rigidity for supporting the contact plate 12 is necessary, an appropriate range is obtained from the results of experiments and the like. That is, if it is too small, the support strength becomes too small, and if it is too large, the heat transfer amount and the heat radiation amount become too large, resulting in poor responsiveness during temperature measurement and large measurement errors.

  A pressure receiving hole 14a is provided at the upper center of the contact piece 14, and a conductor groove 14b and a flat portion 14c are provided on the side surface. The pressure receiving hole 14a is a hole into which a tip (pressing point) of a spring pin (spring probe, contact pin) 40 which is a pressing member disposed in the Z direction is inserted, and is formed in a circular shape or a conical shape. The depth, that is, the position in the Z direction where the spring pin 40 presses the contact piece 14 is preferably the center of gravity of the head 10. By setting the center of gravity, the head can swing more easily with less force and moment.

  The conducting wire groove 14b is a groove for accommodating the thermocouple wires 11b and 11c of the thermocouple 11 rising from the side of the contact plate 12, and an insulating tube 15 for inserting the thermocouple wires 11b and 11c is provided. Since this insulating tube 15 often has a heat insulating function in addition to the insulating function, it extends below the portion of the conductor groove 14b and accommodates the thermocouple wires 11b and 11c rising from the contact plate 12 to dissipate heat. It is preferable to prevent such heat transfer. The flat part 14c is a part where the parallel part 23b, which is the holding part of the L-shaped guide 23 of the support member 20, contacts from the outside. The parallel portion 23b comes into contact with the flat portion 14c and is not fixed to the support member 20, and holds the contact piece 14 in a movable state.

  In addition, this contact piece can also be made into the shape which does not have the flat part 14c like the contact piece 10 'shown in FIG. In this case, since the parallel part 23b of the L-shaped guide 23 sandwiches the cylindrical surface, the fixing degree by the sandwiching is somewhat weakened, but the contact piece 10 'is loosely fitted by the guide member 30, and the movement range and There is no problem because the swing range is limited. In this case, workability is improved by the amount that the flat portion 14c is not processed.

  Next, the support member 20 will be described. As shown in FIGS. 1, 4 and 6, the support member 20 has the contact piece 14 so that the position of the contact plate 12 at the tip of the head 10 (10 ′) becomes the reference position of the thermometer. It supports in an unfixed state. The support member 20 is formed of a columnar body 21, and a through hole 21 a for inserting the spring pin 40 is provided in the central portion in the pressing direction of the spring pin 40, that is, the Z direction, and a thermocouple is provided on the side surface. A conductor groove 21b is provided along the wires 11b and 11c. Further, L-shaped guides (holding members) 22 are attached to two portions of the flat portion 21c on the side surface in pairs by spot welding or the like.

  The L-shaped guide 22 is a holding member for holding the contact piece 14 on the columnar body 21 through a gap in a fixed range within a certain range, and is parallel to the tip (locking member) 22a (pinched) Part) 22b and formed of an elastic metal plate. The tip portion 22a is formed by bending a plate forming the parallel portion 22b at a right angle in the X direction, and the tip portion 22a and the parallel portion 22b form an L shape. The L-shaped guides 22 are arranged in pairs, and are arranged so that the front end portions 22a face inward. The tip 22a serves as a locking member that restrains the contact piece 14 from moving beyond a predetermined position in the direction in which the contact plate 12 moves toward the temperature-measured body 50, that is, the Z direction. The contact piece 14 is disposed between the L-shaped guides 22, and the contact piece 14 is sandwiched between the parallel portions 22b and held in an unfixed state.

  A through screw hole 21d is provided in the upper part of the columnar body 21, and is fixed to the guide member 30 by a male screw member 31 or the like. With this fixed position, the contact plate 12 is arranged at a predetermined position with respect to the guide member 30.

  Next, the guide member 30 will be described. As shown in FIGS. 1 to 4, the guide member 30 holds the head 10 and the support member 20 in a state in which the head 10 (10 ′) and the support member 20 are allowed to move up and down or swing slightly. A portion that covers the head 10 and the support member 20 and exhibits a heat insulating effect between the outside and a stainless tube or the like, in which the head 10 is loosely fitted and the support member 20 is fixed. It is formed in a shape. In the case of manual measurement, the contact plate 12 disposed on the distal end side with the guide member 30 is pressed against the temperature object 50. In automatic measurement or the like, the contact member 12 is brought into contact with or pressed against the temperature-measured body 50 when the guide member 30 is engaged with various devices and the guide member 30 moves.

  Next, the spring pin 40 will be described. The spring pin 40 is a pressing member that applies a pressing force related to the contact pressure to the contact plate 12 via the contact piece 14. In the spring pin 40, the piston 42 enters and exits from within the cylinder 41, and the piston 42 is biased in a direction to exit by a spring (not shown) in the cylinder 41. Due to the urging force of the distal end portion 43 of the spring pin 40, the contact piece 14 is always in a state in which a force pushed toward the temperature-measured body 50 is acting in the Z direction.

  In addition, since the spring pin 40 applies a pressing force to the contact plate 12 via the contact piece 14, it is sufficient that the pressing force within a predetermined range can be exerted. Therefore, the type, structure, shape, material, and the like of the pressing member to be pressed Even if is different, the measurement is not affected. Therefore, it is not necessary to limit to the spring pin 40, and a wide range of pressing members such as a coil spring and air pressure can be used.

  Next, assembly will be described. The head 10 and the support member 20 are assembled by inserting the spring pin 40 into the installation hole 21a of the support member 20 and opening the tip 22a of the L-shaped guide 22 of the support member 20 with respect to the X direction. Is inserted between the tip 22a so that the lower surface of the contact piece 14 is on the upper side of the tip 22a, and the tip 43 of the spring pin 40 is brought into contact with the bottom of the pressure receiving hole 14a of the contact piece 14. By returning 22a to the original position, the contact piece 14 is held between the parallel portions 22b. With this configuration, the tip 22a prevents the contact piece 14 from further sliding down in the Z direction, so that the lower end position of the contact plate 12 can be fixed to a fixed position with respect to the support member 20 and the guide member 30. Thereafter, the support member 20 combined with the head 10 is inserted into the guide member 30, and the support member 20 is fixed to a predetermined position of the guide member 30 while the head 10 is in a loosely fitted state.

  In this assembled state, the lower limit of the movable range in the Z direction of the contact plate 12 is limited by the tip 22 a of the L-shaped guide 22. At the time of temperature measurement, by pressing the guide member 30 against the temperature object 50, the head 10 pressed downward by the urging force of the spring pin 40 is pressed toward the temperature object 50 side, and the contact plate 12 is moved. It contacts the temperature object 50. Further, since the L-shaped guide 23 is inserted into the guide member 30, if the distal end portion 22a is appropriately sized, the L-shaped guide 23 hits the inner wall of the guide member 30 even if it opens, and opens widely. The contact piece 14 will not come off.

  The spring pin 40 has a tip 43 that pushes one point of the pressure receiving hole 14a of the head 10 downward, so that the head 10 can swing with a slight force or moment around this point. Become. Therefore, during temperature measurement, the angle of the guide member 30 with respect to the temperature-measuring object 50 is slightly deviated from the vertical, and the guide member 30 is not correctly supported perpendicularly to the surface of the temperature-measuring object 50, that is, the guide member 30. Even if there is such a posture error, the contact plate 12 can be brought into surface contact with the surface of the temperature-measured body 50 accurately by swinging the head 10.

  Further, when the pressing force is larger than the urging force of the spring pin 40, the contact piece 14 moves in a direction away from the temperature-measured body 50, so that the force that the contact plate 12 presses the temperature-measurement body 50 is applied. It is determined by the power and can prevent excessive pressing force. This upward movement stops when the contact plate 12 is in the same position as the lower end 30 a of the guide member 30. That is, the lower end 30a of the guide member 30 is an upper limit stopper for the movement of the head 10. During the upward movement, the contact piece 14 moves along the parallel portion 22b of the L-shaped guide 22 and along the inner wall of the guide member 30, so that the contact piece 14 moves up and down smoothly and does not twist. Further, since the head 10 and the support member 20 are assembled by the L-shaped guide 22, the L-shaped guide 21 and the plane parallel to the YZ plane contact each other in the direction parallel to the YZ plane. You can slide and move relative. Further, with respect to the direction parallel to the XZ plane, the parallel portion 22b of the L-shaped guide 22 is bent and deformed in the X direction at the gap portion between the contact piece 14 and the columnar body 21, and the relative relationship between the contact piece 14 and the columnar body 21 is obtained. Can move. By allowing the relative movement parallel to the YZ plane and allowing the relative movement parallel to the XZ plane, the contact plate 12 can more accurately come into surface contact with the surface of the temperature measuring body 50.

  According to the above configuration, the contact plate 12 provided with the temperature measuring unit 11a is fixedly supported on the contact piece 14 by the plurality of support columns 13 with a gap, so that heat transfer from the contact plate 12 to the contact piece 14 The amount can be significantly reduced. In addition, since the contact piece 14 is provided with a gap and engaged with the support member 20 by the L-shaped guide 22, the amount of heat transfer from the contact piece 14 to the support member 20 can also be reduced. Furthermore, since the contact piece 14 and the support member 20 are accommodated in the guide member 30, the heat exchange effect between the contact piece 14 and the support member 20 and the outside is reduced by the heat insulating effect of the guide member 30. Therefore, it is difficult for the heat of the contact plate 12 to escape, the responsiveness during temperature measurement can be improved, and the measurement error can be reduced.

  Further, the contact piece 14 is pressed toward the temperature-measured body 50 so that the contact piece 14 can be swung at one point by the urging force of the spring pin 40, and the contact piece 14 can be swung by the L-shaped guide 22. Therefore, the contact plate 12 can be accurately brought into surface contact with the surface of the temperature-measuring body 50. Therefore, since heat transfer from the temperature-measured body 50 to the contact plate 12 is stabilized, responsiveness during temperature measurement can be improved and measurement errors can be reduced from this aspect.

  In addition, the head 10 is an independent part integrally formed with the ultrafine thermocouple 11, the contact plate 12, the support column 13, and the contact piece 14, and can be easily detached, so that only the head 10 is repaired. It becomes possible to respond flexibly by exchanging. In addition, it can be used as a single part for special products.

  For the thermocouple 11, for example, an ultrafine thermocouple of 0.1 mmφ or the like is used, and wiring is made along the contact plate 12 to avoid heat radiation, and the contact piece 14 is raised from the peripheral portion of the contact plate 12. Since it is configured to be taken out through the insulating tube 15 along the conductive wire groove 14b on the side surface, heat transfer and heat radiation by the thermocouple 11 can be reduced.

  Next, a second embodiment will be described. As shown in FIGS. 8 and 9, the contact thermometer 1A according to the second embodiment of the present invention includes a head portion 10A, a pressing portion 20A, and a guide member 30A. The head portion 10A is a guide member 30A. The guide member 30 is accommodated together with the pressing portion 20 in a state engaged with the guide member 30.

  As shown in FIGS. 8 and 9, the head portion 10 </ b> A includes an ultrafine thermocouple 11, a contact plate 12, a support 13, and a contact piece 14 </ b> A. The configurations of the thermocouple 11, the contact plate 12, and the support column 13 are the same as those in the first embodiment. The contact piece 14 </ b> A is formed in a prismatic shape or a cylindrical shape as in the first embodiment, and the support column 13 is fixed to the side surface of the contact piece 14. Moreover, the conducting wire groove 14b is provided.

  However, as shown in FIGS. 8 and 9, the contact piece 14A of the second embodiment is not fixed to the guide member 30A but is held by the guide member 30A by the support bar 31A in a movable state. For this holding, a through hole 14Aa passing through the center portion (or the center of gravity of the head) of the contact piece 14A is provided in the X direction, and a support bar 32 is inserted into the through hole 14Aa. It is fixedly supported by 30 by screws or pins. The size of the through hole 14Aa in the radial direction is formed larger than the size of the support bar 32 in the radial direction so that the contact piece 14A can swing and move up and down. Further, the upper surface of the contact piece 14A is formed flat, and the tip of the coil spring (pressing member) 40A comes into contact therewith.

  The pressing portion 20A is for holding a coil spring 40A disposed above the contact piece 14A of the head 10A, and is formed of a columnar body such as a cylinder. The pressing portion 20A is disposed on the coil spring 40A and fixes the upper end of the coil spring 40A.

  The guide member 30A retains the head portion 10A and the pressing portion 20A in a state in which the head portion 10A is allowed to move up and down and swings somewhat, and covers the head portion 10A and the pressing portion 20A to provide a heat insulating effect between the outside. It is a part to be exhibited, and is formed in a cylindrical shape such as a cylinder into which the head portion 10A and the pressing portion 20A enter. This guide member 30A is formed of a stainless steel tube or the like.

  The coil spring 40A is a pressing member that applies contact pressure to the contact plate 12 via the contact piece 14A, and the urging force of the coil spring 40A causes the head 10A to be constantly pushed toward the temperature-measured body 50 in the Z direction. . The pressing member is not limited to the coil spring 40A, and any member that can generate a pressing force may be used. For example, the pressing member may be formed of an elastic body such as silicon sponge or rubber.

  Next, assembly will be described. Assembling the head portion 10A, the pressing portion 20A, and the guide member 30A is performed by inserting the pressing portion 20A into the guide member 30A and fixing it, then inserting the coil spring 40A from the Z direction, and further inserting the head portion 10A. The support bar 31A is inserted from the X direction so as to pass through the through hole 14Aa of the head 10A inserted into the guide member 30A, and both ends of the support bar 32 are detachably fixed to the guide member 30A. This fixing is performed, for example, by screwing or pinning.

  In this assembled state, the lower limit of the movable range in the Z direction of the contact plate 12 is when the support bar 32 abuts the lower side of the through hole 14Aa, and the upper limit of the movable range is the upper side of the through hole 14Aa. It is time to abut. At the time of temperature measurement, the guide member 30A is pressed against the temperature measurement object 50, whereby the head 10A pressed downward by the biasing force of the coil spring 40A is pressed toward the temperature measurement object 50, and the contact plate 12 is covered. It contacts the temperature measuring body 50.

  The coil spring 40A pushes the upper surface of the contact piece 14A of the head 10A downward at the lower end thereof, so that it is difficult to swing as compared with the first embodiment, but the pressing force of the coil spring 40A Are dispersed in the peripheral portion of the upper surface of the contact piece 14A, the head can be swung. Therefore, even if the angle of the temperature-measured body 50 and the guide member 30 is slightly deviated during temperature measurement and the guide member 30 is not correctly supported perpendicularly to the surface of the temperature-measured body 50, the head 10A swings. The contact plate 12 can accurately make surface contact with the surface of the temperature-measuring object 50.

  Further, when the pressing force becomes larger than the urging force of the coil spring 40A, the contact piece 14A moves upward (in a direction away from the temperature-measured body 50), so that the force that the contact plate 12 presses the temperature-measurement body 50 is It is determined by this urging force, and an excessive pressing force can be prevented from being generated. This upward movement stops when the contact plate 12A is at the same position as the lower end 30a of the guide member 30 or when the support bar 32 comes into contact with the upper end of the through hole 14Aa. That is, the lower end 30a of the guide member 30A or the upper end of the through hole 14Aa serves as an upper limit stopper for the movement of the head 10A.

  The relative movement of the contact piece 14A with respect to the guide member 30A includes a gap between the through hole 14Aa and the support bar 32 and a gap between the contact piece 14A and the guide member 30A. Can be done within. During this movement, the coil spring 40A merely presses the contact plate 12A, and there is no active guidance (guide) like the L-shaped guide 22 of the first embodiment. is there. However, the work of the contact piece 14A is easier than the contact piece 14 of the first embodiment, and the pressing force, the size, and the moving range differ depending on the type of the temperature object 50, that is, the temperature measurement object. Therefore, the field of application of the second embodiment is also large.

  According to the configuration of the contact-type thermometer 1A of the second embodiment, the contact plate 12 provided with the temperature measuring unit 11a is fixedly supported on the contact piece 14A by the plurality of support columns 13 with a gap. Therefore, the amount of heat transfer from the contact plate 12 to the contact piece 14A can be remarkably reduced. Further, since the contact piece 14A is engaged with the guide member 30A by the support bar 32, the amount of heat transfer from the contact piece 14A to the guide member 30A can also be reduced. Furthermore, since the contact piece 14A and the pressing portion 20A are housed in the guide member 30A, the amount of heat exchange between the contact piece 14A and the pressing portion 20A and the outside is reduced by the heat insulating effect of the guide member 30A. Therefore, it is difficult for the heat of the contact plate 12 to escape, the responsiveness during temperature measurement can be improved, and the measurement error can be reduced.

  Further, the contact piece 14A is pressed toward the temperature-measured body 50 by the urging force of the coil spring 40A, and the contact piece 14A is engaged with the guide member 30A by the support bar 32 so that the contact piece 14A can swing. Therefore, the contact plate 12 can be brought into precise surface contact with the surface of the temperature-measuring object 50. Therefore, since heat transfer from the temperature-measured body 50 to the contact plate 12 is stabilized, responsiveness during temperature measurement can be improved and measurement errors can be reduced from this aspect. In addition, a portion having the same configuration as that of the first embodiment can achieve the effects described in the first embodiment.

  In the first embodiment and the second embodiment, the method and configuration for supporting the head and the method and configuration for applying a pressing force to the head are changed. However, the head of the first embodiment is different. The head support method and configuration of the second embodiment can also be obtained by combining the method and configuration of supporting the head and the method and configuration of applying the pressing force of the second embodiment. The fourth embodiment may be combined with the method and configuration for applying the pressing force of the first embodiment.

It is a sectional side view which shows the structure of the contact-type thermometer of the 1st Embodiment of this invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a perspective view which shows the structure of the head of the contact-type thermometer of the 1st Embodiment of this invention. It is a perspective view which shows the structure of the supporting member of the contact-type thermometer of the 1st Embodiment of this invention. It is a perspective view which shows another structure of the head of a contact-type thermometer. It is a sectional side view which shows the structure of the contact-type thermometer of the 2nd Embodiment of this invention. It is an AA arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Contact-type thermometer 10,10 ', 10A Head 11 Thermocouple 11a Temperature measuring part 12 Contact board 13 Support | pillar 14,14A Contact piece 14a Pressure receiving hole 14c Flat part 14Aa Through-hole 20 Support member 20A Pressing part 21, 21A Column 22 L-shaped guide (holding member)
22a Tip (locking member)
22b Parallel part (clamping part)
30, 30A Guide member 40 Spring pin (pressing member)
40A coil spring (pressing member)
50 Temperature object

Claims (5)

  A temperature measuring part for measuring the temperature of the temperature measuring body, a contact plate that is pressed against the surface of the temperature measuring object and performs heat transfer between the temperature measuring object and the temperature measuring part, and the contact plate In the contact-type thermometer having a pressing member for generating an urging force that presses the object to be measured, the temperature measuring unit is disposed on the contact plate, and a gap is provided between the contact plate and the contact piece. The contact plate is coupled to the contact piece with a support provided on the contact plate, and the contact plate is pressed against the temperature-measured body by pressing the contact piece with the pressing member. Contact type thermometer.   2. The contact according to claim 1, wherein a head portion in which the temperature measuring unit, the contact plate, the support column, and the contact piece are integrated is swingably fitted inside a cylindrical guide member. Type thermometer.   The contact-type thermometer according to claim 1, wherein the pressing member presses one point of the contact piece.   The contact piece is clamped by a holding member having a clamping portion that protrudes from the support member and is arranged in a pair, and the contact plate moves in the direction in which the contact plate moves toward the temperature-measured body by the locking member of the clamping portion. 4. The contact-type thermometer according to claim 1, wherein the contact piece is constrained so as not to move beyond a predetermined position.   The contact piece is loosely fitted into the guide member, and a through hole is provided in the contact piece in a direction perpendicular to the pressing direction of the pressing member, and the support bar inserted in the through hole in a loosely fitted state is provided. The contact-type temperature according to claim 1, 2, or 3, wherein the contact piece is fixed to a guide member in a direction perpendicular to a pressing direction of the pressing member, and the contact piece is supported by the support bar so as to be able to swing. Total.

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