JP6020141B2 - Differential scanning calorimeter - Google Patents

Description

  The present invention relates to a differential scanning calorimeter for measuring a calorific difference between a sample to be measured and a reference material.

  A differential scanning calorimeter (DSC) that detects the temperature of a sample to be measured and a reference material while heating them in a heating furnace is known (see Patent Document 1 below). By using a differential scanning calorimeter, the calorific difference between the sample to be measured and the reference material can be measured based on a temperature change that occurs when the sample to be measured melts.

  FIG. 5 is a cross-sectional view showing a configuration example of a conventional differential scanning calorimeter 101. The differential scanning calorimeter 101 includes a heating furnace 102 and a heater unit 103, for example. The heating furnace 102 is attached to the heater unit 103 by a plurality of fixing screws 104 and constitutes an integral differential scanning calorimeter 101 together with the heater unit 103.

  The heating furnace 102 is provided with, for example, a measured sample placing part 121 on which a measured sample is placed, and a reference material placing part 122 on which a reference substance is placed. The measured sample placing part 121 and the reference material placing part 122 are arranged side by side on a horizontal plane so as to be close to each other. In FIG. 5, the measured sample mounting part 121 and the reference material mounting part 122 are arranged in the front-rear direction of the paper.

  The heater unit 103 includes a heater 131 and two holding plates 132 and 133 holding the heater 131 from both sides. In this example, heaters 131 are arranged on both sides of the cooling plate 134, and holding plates 132 and 133 are arranged outside the heaters 131, respectively. Thus, the heater unit 103 can not only increase the temperature of the heating furnace 102 using the heater 131 but also decrease the temperature of the heating furnace 102 using the cooling plate 134.

  The surface of the heater unit 103 on the heating furnace 102 side, that is, the upper surface of the holding plate 132 functions as a heat transfer surface 135 for transferring heat from the heater unit 103 to the heating furnace 102. At this time, the one holding plate 132 constitutes a heat transfer plate disposed between the heating furnace 102 and the heater 131. The holding plate 132 is made of, for example, copper, and can transmit the heat of the heater 131 to the heating furnace 102 with high thermal conductivity.

  Thermocouples 105 are respectively connected to the back side (lower surface) of the measurement sample mounting part 121 and the reference material mounting part 122 in the heating furnace 102. By detecting the temperature of the measured sample mounting portion 121 and the reference material mounting portion 122 via these thermocouples 105, the difference in calorie between the measured sample and the reference material can be measured based on the temperature change. it can.

JP 2012-78146 A

  In the conventional configuration as described above, the heat transfer surface 135 is formed by a flat surface, and the entire heat transfer surface 135 is in contact with the heating furnace 102. Therefore, depending on the flatness of the heat transfer surface 135, there is a possibility that the entire heat transfer surface 135 cannot be brought into close contact with the heating furnace 102. If the entire heat transfer surface 135 cannot be brought into close contact with the heating furnace 102, an air layer is partially interposed between the heat transfer surface 135 and the heating furnace 102.

  When an air layer is interposed between the heat transfer surface 135 and the heating furnace 102, the heat transfer rate from the heat transfer surface 135 to the heating furnace 102 decreases. Therefore, when such an air layer is partially generated, the amount of heat transferred to the heating furnace 102 varies in the entire heat transfer surface 135. As a result, the temperature distribution varies between the measured sample mounting portion 121 side and the reference material mounting portion 122 side, and there is a problem that the calorific difference between the measured sample and the reference material cannot be accurately measured. is there.

  Such a decrease in measurement accuracy may cause various adverse effects such as an increase in drift occurring in the baseline of measurement data obtained as a measurement result. Therefore, it is conceivable to improve the flatness of the heat transfer surface 135 by polishing the heat transfer surface 135 with higher accuracy. However, in this case, there arises a problem that the manufacturing cost increases.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a differential scanning calorimeter that can improve measurement accuracy at low cost.

A differential scanning calorimeter according to the present invention is a differential scanning calorimeter for measuring a calorific difference between a sample to be measured and a reference material, and a sample-to-be-measured portion on which the sample to be measured is placed, and a reference A reference material placement portion on which a material is placed is disposed between a heating furnace provided symmetrically with respect to a center line, a heater for heating the heating furnace, and the heating furnace and the heater, A heat transfer plate capable of transferring the heat of the heater to the heating furnace, and at least one of the surface on the heating furnace side of the heat transfer plate, or the surface of the heat transfer plate side of the heating furnace, Protrusions that limit the contact area between the heat transfer plate and the heating furnace are formed so as to be symmetric with respect to the center line.

  According to such a configuration, since the convex portion is formed on at least one of the surface of the heat transfer plate on the side of the heating furnace or the surface of the heat transfer plate on the heating furnace, the heat transfer plate and the heating furnace The contact area between the two can be limited to the convex portion. Thereby, since the contact area between a heat exchanger plate and a heating furnace becomes small, a surface pressure becomes high and the adhesiveness in a contact area | region improves. As a result, it is possible to suppress the presence of an air layer in the contact region and improve the heat transfer coefficient between the heat transfer plate and the heating furnace.

  Since the convex portions as described above are formed so as to be symmetric with respect to the center line between the measured sample mounting portion and the reference material mounting portion, the measured sample mounting portion side It is possible to prevent variation in the temperature distribution between the reference material placement part side and the reference material placement part side, and to accurately measure the difference in calorie between the sample to be measured and the reference material. Moreover, since it is a simple structure that a convex part is formed on at least one of the surface on the heating furnace side in the heat transfer plate or the surface on the heat transfer plate side in the heating furnace, an increase in manufacturing cost is prevented. be able to. Therefore, measurement accuracy can be improved at low cost.

  A plurality of the convex portions may be formed on the surface of the heat transfer plate on the heating furnace side so as to be separated from each other. In this case, a fixing hole for fixing the first fixture may be formed in each of the plurality of convex portions when the heating furnace is attached to the heat transfer plate.

  According to such a configuration, the first fixing tool is fixed to the fixing hole formed in each convex portion, and the heating furnace is attached to the heat transfer plate, whereby the heat transfer plate and the heating furnace corresponding to each convex portion. The degree of adhesion can be further improved in each contact area between the two. Thereby, the measurement accuracy can be further improved.

  On the surface of the heat transfer plate on the side of the heating furnace, a through hole for passing a second fixture when the heat transfer plate is attached to the heater may be formed in a region other than the convex portion. .

  According to such a structure, when attaching a heat exchanger plate to a heater, the through-hole for letting a 2nd fixing tool pass can be efficiently formed in areas other than a convex part. That is, a fixing hole is formed in each convex part in the heat transfer plate, and a through hole is formed in a region other than the convex part, thereby improving the adhesion in each contact region, and the first fixing tool and the second fixing tool. The fixed positions can be dispersed.

  The heating furnace may be formed in a circular shape in plan view. The heat transfer plate may be formed in a rectangular shape in plan view, and each side may be set to a length equal to or greater than the diameter of the heating furnace. In this case, it is preferable that the through hole is formed at least at a corner of the heat transfer plate.

  Contact surfaces of the heating furnace and the heat transfer plate may be formed of different materials.

  According to such a configuration, measurement accuracy can be effectively improved in a configuration in which the contact surfaces of the heating furnace and the heat transfer plate are formed of different materials. That is, when the contact surfaces of the heating furnace and the heat transfer plate are made of different materials, the contact surfaces slide due to the difference in expansion coefficient or contraction rate between the materials, and heat transfer It can be a disturbance. Even in such a case, according to the present invention, it is possible to suppress the presence of an air layer in the contact region and improve the heat transfer coefficient between the heat transfer plate and the heating furnace. The accuracy can be improved effectively.

  According to the present invention, by limiting the contact area between the heat transfer plate and the heating furnace to the convex portion, the degree of adhesion in the contact area is improved, and the heat transfer coefficient between the heat transfer plate and the heating furnace is increased. Therefore, the measurement accuracy can be improved at a low cost by using a simple configuration in which a convex portion is formed.

It is the top view which showed the structural example of the differential scanning calorimeter which concerns on one Embodiment of this invention. It is AA sectional drawing of the differential scanning calorimeter of FIG. It is the top view which showed the structural example of the holding plate. It is the top view which showed the modification of the holding plate. It is the top view which showed the modification of the holding plate. It is the top view which showed the modification of the holding plate. It is sectional drawing which showed the structural example of the conventional differential scanning calorimeter.

  FIG. 1 is a plan view showing a configuration example of a differential scanning calorimeter 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of the differential scanning calorimeter 1 of FIG. The differential scanning calorimeter 1 is for measuring a calorific difference between a sample to be measured and a reference material, and includes, for example, a heating furnace 2 and a heater unit 3.

  The heating furnace 2 includes a circular mounting table 21, a cylindrical peripheral wall 22 that surrounds the outer periphery of the mounting table 21, and an annular flange portion 23 that projects radially from the lower end of the peripheral wall 22. It is formed in a circular shape when viewed. The heating furnace 2 is formed, for example, by plating the surface of copper with a dissimilar metal. However, the material of the heating furnace 2 is not limited to the above material, and the heating furnace 2 can be formed of other materials such as silver as long as the material has high thermal conductivity.

  On the mounting table 21, a measured sample mounting part 211 and a reference material mounting part 212 are provided symmetrically on both sides of the center line L. The measurement sample mounting unit 211 and the reference material mounting unit 212 are formed by, for example, circular flat surfaces, and are arranged side by side on a horizontal plane so as to be close to each other. A sample to be measured (measurement sample) is placed on the measurement sample mounting unit 211. On the other hand, a reference material (reference material) such as alumina is placed on the reference material placement unit 212.

  A plurality of through holes 231 are formed in the flange portion 23 at equal intervals in the circumferential direction. In this example, four through holes 231 are formed every 90 ° with respect to the center point P. The fixing screws 4 are inserted into the through holes 231 and each fixing screw 4 is fixed to the heater unit 3, whereby the heating furnace 2 is attached to the heater unit 3. However, the numbers of the through holes 231 and the fixing screws 4 are not limited to four, but may be three or less, or may be five or more. Further, the fixture (first fixture) for attaching the heating furnace 2 to the heater unit 3 may be constituted by a fixture other than the fixing screw 4.

  The heater unit 3 includes a heater 31 for heating the heating furnace 2 and two holding plates 32 and 33 that hold the heater 31 from both sides. In this example, two heaters 31 are provided, and a cooling plate 34 is sandwiched between the heaters 31. Thereby, the heater 31 is arrange | positioned on both sides on both sides of the cooling plate 34, and it has the structure by which the holding plates 32 and 33 are arrange | positioned on the outer side of those heaters 31, respectively.

  Each heater 31 is composed of a sheathed heater, for example, and is configured by housing a heating element such as a nichrome wire with an insulating material sandwiched in a metal tube. Each heater 31 is disposed on the upper surface side and the lower surface side of the cooling plate 34 while being wound in a horizontal plane. Metal sheets 35 are respectively disposed between one heater 31 and the upper surface of the cooling plate 34 and between the other heater 31 and the lower surface of the cooling plate 34. These metal sheets 35 are made of, for example, silver, and prevent the contact surfaces from sliding due to a difference in expansion rate or contraction rate between the heater 31 and the cooling plate 34 that are different materials. It functions as a cushioning material.

  The cooling plate 34 is connected to a refrigerant accommodating portion (not shown) in which a refrigerant such as liquid nitrogen is accommodated. Thus, in this embodiment, since the heater 31 and the cooling plate 34 are provided in the heater unit 3, not only can the temperature of the heating furnace 2 be raised using the heater 31, but also the cooling plate 34 is used. Thus, the temperature of the heating furnace 2 can be lowered.

  The holding plates 32 and 33 are formed in a rectangular shape in a plan view using a material having high thermal conductivity such as copper. In plan view, the length of each side of the holding plates 32 and 33 is set to be equal to or larger than the diameter of the heating furnace 2, and when the heating furnace 2 is attached to the heater unit 3, the upper surface of the heater unit 3 (holding) The heating furnace 2 is configured to be within the range of the upper surface of the plate 32.

  A metal sheet 36 is disposed between the one heater 31 and the holding plate 32. The metal sheet 36 is made of, for example, silver, and prevents the contact surfaces from sliding due to a difference in expansion rate or contraction rate between the heater 31 and the holding plate 32 that are different materials. It is designed to function as a cushioning material.

  The holding plate 32 is attached to one heater 31 side using the fixing screw 5. The holding plate 33 is attached to the other heater 31 side using the fixing screw 6. These fixing screws 5, 6 are fixing tools (second fixing tools) for attaching the holding plates 32, 33 to the heater 31, and are fixed to the cooling plate 34 by being fastened to the cooling plate 34. The heater 31 can be sandwiched and attached between the plates 32 and 33.

  The thermocouple 7 is connected to the back side (lower surface) of the measured sample mounting part 211 and the reference material mounting part 212 in the heating furnace 2. Each thermocouple 7 extends in the vertical direction so as to penetrate the heater unit 3. By detecting the temperature of the measured sample mounting portion 211 and the reference material mounting portion 212 via these thermocouples 7, the difference in calorie between the measured sample and the reference material can be measured based on the temperature change. it can.

  FIG. 3 is a plan view showing a configuration example of the holding plate 32. The holding plate 32 provided on the heating furnace 2 side in the heater unit 3 is disposed between the heating furnace 2 and the heater 31, and constitutes a heat transfer plate capable of transferring the heat of the heater 31 to the heating furnace 2. .

  A plurality of convex portions 321 are formed on the surface (upper surface) on the heating furnace 2 side of the holding plate 32. In this example, the four convex portions 321 are formed so as to be symmetric with respect to the center line L described above. Specifically, four convex portions 321 respectively corresponding to the four sides of the holding plate 32 are formed so as to protrude from each side to the center point P side. Each convex part 321 is formed so as to be separated from each other, and is configured as an independent convex part 321 at the same height.

  The upper surface of each convex portion 321 constitutes a transmission surface for transmitting heat from the heater unit 3 to the heating furnace 2. Among the upper surface of each convex portion 321, a plurality of regions indicated by hatching in FIG. 3 are contact regions 322 that are in contact with the lower surface of the heating furnace 2. In this example, the area of the upper surface (transmission surface) of each convex portion 321 is the same, and the area of each contact region 322 is also the same, but this is not restrictive.

  A fixing hole 323 for fixing the fixing screw 4 when the heating furnace 2 is attached to the holding plate 32 is formed in the contact area 322 on the upper surface of each convex portion 321. In this example, the fixing hole 323 is a screw hole, and the fixing screw 4 is inserted into each through-hole 231 of the heating furnace 2, and each fixing screw 4 is fastened to the corresponding fixing hole 323 to be fixed. 2 can be attached to the heater unit 3.

  The plurality of fixing holes 323 are arranged so as to be symmetric with respect to the center line L, and the relative positions of the fixing holes 323 on the upper surface of each convex portion 321 coincide. It is preferable that the same number of fixing holes 323 be formed in each convex portion 321. In this example, one fixing hole 323 is formed in each convex part 321, but the present invention is not limited to this, and a plurality of fixing holes 323 may be formed in each convex part 321.

  A through hole 324 through which the fixing screw 5 is passed when the holding plate 32 is attached to the heater 31 is formed in a region (upper surface) on the heating furnace 2 side of the holding plate 32 in a region other than the convex portion 321. In this example, through holes 324 are formed at each corner of the holding plate 32. That is, the convex part 321 is not formed in the area | region corresponding to each corner | angular part of the holding | maintenance board 32 among the upper surfaces of the holding | maintenance board 32, and the through-hole 324 is each formed in these each corner | angular part. However, the configuration is not limited to this, and the through hole 324 may be formed in another region on the upper surface of the holding plate 32.

  An insertion hole 325 for inserting the thermocouple 7 is formed in the central portion of the holding plate 32. That is, the convex part 321 is not formed in the area | region corresponding to the center part of the holding plate 32 among the upper surfaces of the holding plate 32, and the penetration hole 325 is formed in the said center part. In this example, the convex portions 321 are formed so as to be separated from each other, so that the region corresponding to each corner of the holding plate 32 in which the through hole 324 is formed on the upper surface of the holding plate 32 is inserted. A region corresponding to the central portion of the holding plate 32 in which the hole 325 is formed communicates with each other in a horizontal plane.

  In this embodiment, since the convex part 321 is formed in the surface (upper surface) by the side of the heating furnace 2 in the holding plate 32, the contact area 322 between the holding plate 32 and the heating furnace 2 is made into the said convex part 321. It can be limited. Thereby, since the contact area between the holding plate 32 and the heating furnace 2 is reduced, the surface pressure is increased, and the degree of adhesion in the contact region 322 is improved. As a result, the presence of an air layer in the contact region 322 can be suppressed, and the heat transfer coefficient between the holding plate 32 and the heating furnace 2 can be improved.

  Since the convex portions 321 as described above are formed so as to be symmetrical with respect to the center line L between the measured sample mounting portion 211 and the reference material mounting portion 212, the measured sample It is possible to prevent variation in temperature distribution between the placement unit 211 side and the reference material placement unit 212 side, and to accurately measure the difference in calorie between the sample to be measured and the reference material. Moreover, since it is the simple structure of forming the convex part 321 in the surface at the side of the heating furnace 2 in the holding plate 32, it can prevent that manufacturing cost becomes high. Therefore, measurement accuracy can be improved at low cost.

  In particular, in the present embodiment, the plurality of convex portions 321 are formed so as to be separated from each other, and a fixing hole 323 for fixing the fixing screw 4 to each convex portion 321 is formed. Therefore, by fixing the fixing screw 4 in the fixing hole 323 formed in each convex portion 321 and attaching the heating furnace 2 to the holding plate 32, the holding plate 32 corresponding to each convex portion 321 and the heating furnace 2 In each contact region 322 between, the degree of adhesion can be further improved. Thereby, the measurement accuracy can be further improved.

  Further, in the present embodiment, the through hole 324 for allowing the fixing screw 5 to pass when attaching the holding plate 32 to the heater 31 can be efficiently formed in a region other than the convex portion 321. That is, by forming the fixing hole 323 in each convex portion 321 in the holding plate 32 and forming the through hole 324 in a region other than the convex portion 321, the fixing screw 4 and the fixing screw 4 and The fixing positions of the fixing screw 5 can be dispersed.

  In the present embodiment, the contact surfaces of the heating furnace 2 and the holding plate 32 are formed of different materials. In the case of such a configuration, the contact surfaces slide due to the difference in expansion coefficient or contraction ratio between materials, which can be a disturbance during heat transfer. Even in such a case, in the present embodiment, it is possible to suppress the presence of an air layer in the contact region 322, and to improve the heat transfer coefficient between the holding plate 32 and the heating furnace 2, Measurement accuracy can be improved effectively.

  4A to 4C are plan views illustrating modifications of the holding plate 32. In the above embodiment, the configuration in which the plurality of convex portions 321 are formed so as to be separated from each other has been described. However, the configuration is not limited to such a configuration, and as illustrated in FIGS. A configuration in which one convex portion 321 is formed on the surface (upper surface) of the above may be used.

  In the example of FIG. 4A, a plurality of convex portions 321 as shown in FIG. 3 are connected to each other via a connecting portion 326 to form one convex portion 327. The convex portion 327 is formed so as to be symmetric with respect to the center line L between the measured sample mounting portion 211 and the reference material mounting portion 212. In this case, among the upper surface of the convex portion 327, a series of regions shown by hatching in FIG. 4A constitutes a contact region 322 that contacts the lower surface of the heating furnace 2.

  A plurality of fixing holes 323 for fixing the fixing screw 4 when attaching the heating furnace 2 to the holding plate 32 are formed in the contact region 322 on the upper surface of the convex portion 327. These fixing holes 323 are arranged so as to be symmetric with respect to the center line L. Further, the through hole 324 through which the fixing screw 5 is passed when attaching the holding plate 32 to the heater 31 is formed in a region other than the convex portion 327 on the upper surface of the holding plate 32.

  In this example, as in the above embodiment, the convex portions 327 are not formed in the regions corresponding to the respective corners on the upper surface of the holding plate 32, and the through holes 324 are formed in the respective corners. Yes. Further, the convex portion 327 is not formed in a region corresponding to the central portion on the upper surface of the holding plate 32, and an insertion hole 325 for inserting the thermocouple 7 is formed in the central portion. The number of the fixing holes 323 and the through holes 324 is not limited to four, but may be three or less, or may be five or more.

  In the example of FIG. 4B, an annular convex portion 328 is formed on the upper surface of the holding plate 32. The convex portion 328 is formed so as to be centered on the center point P, so that the convex portion 328 is symmetric with respect to the center line L between the measured sample mounting portion 211 and the reference material mounting portion 212. It is formed with various arrangements. In this case, among the upper surface of the convex portion 328, a series of annular regions shown by hatching in FIG. 4B, that is, the entire upper surface of the convex portion 328 constitutes a contact region 322 that contacts the lower surface of the heating furnace 2. .

  A plurality of fixing holes 323 for fixing the fixing screw 4 when the heating furnace 2 is attached to the holding plate 32 are formed in the contact region 322 on the upper surface of the convex portion 328. These fixing holes 323 are arranged so as to be symmetric with respect to the center line L. Further, the through hole 324 through which the fixing screw 5 is passed when attaching the holding plate 32 to the heater 31 is formed in a region other than the convex portion 328 on the upper surface of the holding plate 32.

  In this example, since the convex portion 328 is formed in an annular shape, a convex portion is formed in each of the regions corresponding to the corners on the upper surface of the holding plate 32 and the region corresponding to the central portion on the upper surface of the holding plate 32. The part 328 is not formed. The through hole 324 is formed in a region corresponding to each corner on the upper surface of the holding plate 32. Further, an insertion hole 325 for inserting the thermocouple 7 is formed in a region corresponding to the central portion on the upper surface of the holding plate 32. The number of the fixing holes 323 and the through holes 324 is not limited to four, but may be three or less, or may be five or more.

  In the example of FIG. 4C, a cross-shaped convex portion 329 is formed on the upper surface of the holding plate 32. The convex portion 329 is formed so as to be centered on the center point P, so that the convex portion 329 is symmetric with respect to the center line L between the measured sample mounting portion 211 and the reference material mounting portion 212. It is formed with various arrangements. In this case, a series of cross-shaped areas indicated by hatching in FIG. 4C on the upper surface of the convex portion 329 constitutes a contact area 322 that contacts the lower surface of the heating furnace 2.

  A plurality of fixing holes 323 for fixing the fixing screw 4 when attaching the heating furnace 2 to the holding plate 32 are formed in the contact region 322 on the upper surface of the convex portion 329. These fixing holes 323 are arranged so as to be symmetric with respect to the center line L. Further, the through hole 324 through which the fixing screw 5 is passed when attaching the holding plate 32 to the heater 31 is formed in a region other than the convex portion 329 on the upper surface of the holding plate 32.

  In this example, since the convex portion 329 is formed in a cross shape, the convex portion 329 is not formed in a region corresponding to each corner portion on the upper surface of the holding plate 32. The through hole 324 is formed in a region corresponding to each corner on the upper surface of the holding plate 32. Further, an insertion hole 325 for inserting the thermocouple 7 is formed in a region corresponding to the central portion on the upper surface of the holding plate 32. As described above, the insertion hole 325 may have a configuration formed in the convex portion 329. The number of the fixing holes 323 and the through holes 324 is not limited to four, but may be three or less, or may be five or more.

  4A to 4C as described above, since the convex portions 327 to 329 are formed on the surface (upper surface) of the holding plate 32 on the heating furnace 2 side, The contact region 322 with the heating furnace 2 can be limited to the convex portions 327 to 329. Thereby, since the contact area between the holding plate 32 and the heating furnace 2 is reduced, the surface pressure is increased, and the degree of adhesion in the contact region 322 is improved. As a result, the presence of an air layer in the contact region 322 can be suppressed, and the heat transfer coefficient between the holding plate 32 and the heating furnace 2 can be improved.

  Since the convex portions 327 to 329 as described above are formed so as to be symmetric with respect to the center line L between the measured sample mounting portion 211 and the reference material mounting portion 212, It is possible to prevent variation in the temperature distribution between the measurement sample placement unit 211 side and the reference material placement unit 212 side, and to accurately measure the difference in calorie between the sample to be measured and the reference material. Moreover, since it is the simple structure of forming the convex parts 327-329 in the surface at the side of the heating furnace 2 in the holding plate 32, it can prevent that manufacturing cost becomes high. Therefore, measurement accuracy can be improved at low cost.

  However, the shape of the convex portion formed on the surface (upper surface) on the heating furnace 2 side of the holding plate 32 is not limited to the above shape, and other various shapes can be adopted. In this case, if the plurality of convex portions are formed so as to be separated from each other, the degree of adhesion in each contact region 322 between the holding plate 32 and the heating furnace 2 can be further improved. Can be further improved.

  In the above example, the configuration in which the convex portion is formed on the surface (upper surface) on the heating furnace 2 side of the holding plate 32 has been described. However, the configuration is not limited to such a configuration, for example, the surface on the holding plate 32 side in the heating furnace 2. Convex portions may be formed on the (lower surface), and convex portions are formed on both the surface of the holding plate 32 on the heating furnace 2 side and the surface of the heating furnace 2 on the holding plate 32 side. It may be a configuration. However, a configuration in which a convex portion is formed on the holding plate 32 is preferable because it is easy to process.

  The heater unit 3 is not limited to the above-described configuration, and other various configurations can be employed. For example, the heater 31 is not limited to the configuration in which two sheathed heaters are provided, and the number of the heaters 31 may be one or three or more, and the type of the heater 31 is other than the sheathed heater. Also good. Further, the present invention is not limited to the configuration in which the cooling plate 34 is sandwiched between the two heaters 31, and may be applied to a configuration in which the cooling plate 34 is not provided, for example.

DESCRIPTION OF SYMBOLS 1 Differential scanning calorimeter 2 Heating furnace 3 Heater unit 4 Fixing screw 5 Fixing screw 6 Fixing screw 7 Thermocouple 21 Mounting stand 22 Peripheral wall 23 Flange part 31 Heater 32 Holding plate 33 Holding plate 34 Cooling plate 35 Metal sheet 36 Metal sheet 211 Covered Measurement sample placing part 212 Reference material placing part 231 Through hole 321 Protruding part 322 Contact region 323 Fixed hole 324 Through hole 325 Inserting hole 326 Connecting part 327 Convex part 328 Convex part 329 Convex part

Claims (4)

A differential scanning calorimeter for measuring a calorimetric difference between a sample to be measured and a reference material,
A heating furnace in which a measured sample mounting portion on which a measured sample is mounted and a reference material mounting portion on which a reference material is mounted are provided symmetrically with respect to the center line;
A heater for heating the heating furnace;
A heat transfer plate disposed between the heating furnace and the heater and capable of transferring heat of the heater to the heating furnace;
At least one of the surface on the heating furnace side of the heat transfer plate or the surface on the heat transfer plate side of the heating furnace is arranged symmetrically with respect to the center line, and the heat transfer plate A differential scanning calorimeter characterized in that a convex portion for limiting a contact area with the heating furnace is formed. On the surface on the heating furnace side of the heat transfer plate, a plurality of the convex portions are formed so as to be separated from each other,
2. The differential scanning according to claim 1, wherein a fixing hole for fixing the first fixing tool is formed in each of the plurality of convex portions when the heating furnace is attached to the heat transfer plate. Calorimeter.   The surface of the heat transfer plate on the heating furnace side is formed with a through hole for passing the second fixture when the heat transfer plate is attached to the heater in a region other than the convex portion. The differential scanning calorimeter according to claim 2, wherein the differential scanning calorimeter is characterized in that   The differential scanning calorimeter according to claim 1, wherein contact surfaces of the heating furnace and the heat transfer plate are formed of different materials.

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