JP2008286720A - Method for measuring thermal physical properties, and instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring thermal physical properties capable of accurately measuring the thermal physical properties of a vacuum insulation material. <P>SOLUTION: In this thermal physical property measuring method, outputs of the first high-temperature side regulator 111, the second high-temperature side regulator 112, the first low-temperature side regulator 114, and the second low-temperature side regulator 115 are regulated to make a surface temperature in one side of an object 105 to be measured uniform, in a prescribed high-temperature zone and to make the surface temperature in the other side thereof uniform in a prescribed low-temperature zone; a heat flow density from the first high-temperature side regulator 111 to the object 105 to be measured is detected thereafter by a high-temperature side heat flow density detecting means 113; and a heat flow density from the object 105 to be measured to the first low-temperature side regulator 114 is detected also therein by a low-temperature side heat flow density detecting means 116; a heat flow density along a thickness direction of the object 105 to be measured is obtained, based on the heat flow density detected by the high-temperature side heat flow density detecting means 113 and the heat flow density detected by the low-temperature side heat flow density detecting means 116; and the thickness is measured, based on the space between a high-temperature side regulation means 103 and a low-temperature side regulation means 104 the thermal conductivity coefficient of the object 105 to be measured is measured. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and apparatus for measuring thermophysical properties for evaluating the heat insulation performance of a high performance heat insulating material such as a vacuum heat insulating material.

  In recent years, vacuum insulation materials have been widely used in refrigerators and vending machines and other freezing and refrigeration equipment, and jar pots and other thermal equipment, greatly reducing the energy consumed by these equipment and greatly improving the energy-saving effect.

  In general, the vacuum heat insulating material used in such applications includes a core material for ensuring the strength of the vacuum heat insulating material, a jacket material that has gas barrier properties and covers the core material, and excess moisture inside the jacket material. It consists of a moisture adsorbent that adsorbs

  As the core material, fiber systems such as glass wool, rock wool, and ceramic fibers, and powder systems such as amorphous silicon and silica are generally used. Further, as the jacket material, a film material having excellent gas barrier properties such as a resin film, a vapor deposition film, and a metal foil film is used so as to suppress gas intrusion from the outside into the vacuum heat insulating material.

  Moreover, generally the heat insulation performance of a heat insulating material is evaluated by the heat conductivity which remove | divided the heat flow density per unit area from the one side of a heat insulating material to an opposite surface by thickness. A smaller thermal conductivity means higher thermal insulation performance.

  The heat conductivity is measured by sandwiching the heat insulating material between parallel flat plates whose temperature can be adjusted, and measuring the heat flow density per unit area when a predetermined temperature difference is provided in the thickness direction of the heat insulating material. At the same time, the thickness between parallel flat plates is measured, and the thermal conductivity is calculated.

  At this time, in the heat insulating material having a multilayer structure such as a vacuum heat insulating material, the heat conductivity in the direction perpendicular to the heat conductivity in the thickness direction is remarkably increased, and there may be a plurality of heat transfer paths. is there. For this reason, there is a method of measuring the heat flow density in the thickness direction and a plurality of directions perpendicular to the thickness direction and obtaining the apparent heat conductivity from the overall apparent heat flow density (see, for example, Patent Document 1).

  FIG. 2 is a schematic cross-sectional view showing the structure of a conventional thermal conductivity measuring device provided with a heat flow meter in a direction perpendicular to the thickness.

  The longitudinal heat flow meters fu and fl are for detecting the heat flow that flows through the measurement heat insulating material S in the thickness direction, and the same configuration is arranged vertically. The lateral heat flow meters fuh and flh are in close contact with the vertical heat flow meters fu and fl arranged above and below, respectively, and detect the heat flow flowing through the skin of the measurement heat insulating material S sandwiched therebetween.

  That is, the heat flow meters fu, fl, fuh, and flh have a two-layer structure, and the horizontal heat flow meters fuh and flh arranged in the vertical direction in close contact with both surfaces as viewed from the heat insulating material S to be measured are inner layers, The arranged longitudinal heat flow meters fu, fl are outer layers. In addition, the upper surface center temperature T1, the lower surface center temperature T2, and the ambient temperature Ta are measured.

  First, a standard sample having a large thermal insulation and a known thermal conductivity is mounted, and the longitudinal heat flow meters fu and fl are calibrated. The heat flow density in the direction perpendicular to the thickness is zero within the error range.

Next, a sheet-like sample of the skin material used for the heat insulating material S to be measured was attached in close contact, and the heat flow density in the thickness direction and the heat flow density in the direction perpendicular to the thickness direction were detected and obtained by the previous calibration. Based on the relational expression, it is possible to calculate the apparent thermal conductivity of the thickness direction and the two heat transfer paths in the vertical direction, the thermal conductivity in the thickness direction, and the apparent thermal conductivity of the skin material. Become.
JP-A-7-209222

  However, in the above conventional configuration, in order to obtain the thermal conductivity of the measured heat insulating material S, a temperature difference is provided on the upper and lower surfaces of the measured heat insulating material S, and the heat flow density in the thickness direction is perpendicular to the thickness. The surface heat flow density is detected and calculated from a relational expression obtained from calibration with a standard sample.

  That is, when the heat flow density in the thickness direction is dominant as the thermal conductivity of the heat insulating material S to be measured, it is suitable as an index as a heat insulating material. However, when the heat insulating performance in the thickness direction is improved, the heat flow in the vertical direction is improved. There is a problem that the degree of influence of density becomes relatively large, and the calculated value by this method is not appropriate.

  In addition, when the heat insulating material S to be measured is a vacuum heat insulating material, the thermal resistance of the heat insulating portion is significantly increased as compared with a general heat insulating material, and in addition, there is a fin portion at the periphery, and the surface is uniform. There was a problem that the temperature could not be adjusted, and a large temperature gradient was formed on the surface due to heat dissipation or heat absorption from the fin portion, and the heat flow density in the vertical direction of the thickness increased.

  Furthermore, the temperature regulator that is originally provided to adjust the temperature of the portion that corresponds to the fin portion is not in contact with the measured heat insulating material S, and if the temperature is adjusted to a predetermined low temperature set value as it is, There was a problem that it was difficult to adjust the temperature due to the latent heat of condensation of water due to condensation of water.

  The present invention provides a thermophysical property measuring method and apparatus such as thermal conductivity by reducing the heat flow density in the direction perpendicular to the thickness so that the heat flow density in the thickness direction can be accurately measured on the surface of the heat insulating material to be measured. With the goal.

  In order to achieve the above object, the thermophysical property measuring method of the present invention is characterized in that the first high-temperature side adjuster has a central portion of one surface of two opposing surfaces perpendicular to the thickness direction of a plate-like object to be measured. And a second high-temperature side adjuster located on the outer peripheral side of the first high-temperature side adjuster is brought into contact with the outer peripheral portion of the one surface of the object to be measured. The adjuster is brought into contact with the central portion of the other surface of the two opposing surfaces perpendicular to the thickness direction of the plate-shaped object to be measured, and the adjuster is positioned on the outer peripheral side of the first low temperature side adjuster. 2, the first low temperature side adjuster is brought into contact with the outer peripheral portion of the other surface of the object to be measured, and the first surface temperature of the object to be measured is uniform in a predetermined high temperature zone. And adjusting the outputs of the high temperature side regulator and the second high temperature side regulator, and the other of the object to be measured After adjusting the outputs of the first low-temperature side adjuster and the second low-temperature side adjuster so that the surface temperature is uniform in a predetermined low temperature zone, the first high-temperature side adjuster The heat flow density toward the object to be measured is detected by the high temperature side heat flow density detecting means, and the heat flow density from the object to be measured toward the first low temperature side regulator is detected by the low temperature side heat flow density detecting means, and the high temperature side The heat flow density in the thickness direction of the object to be measured is obtained based on the heat flow density detected by the heat flow density detection means and the heat flow density detected by the low temperature side heat flow density detection means.

  Thereby, the upper and lower surfaces of the object to be measured are heated or cooled to provide a temperature difference, and the high temperature side heat flow density detecting means and the low temperature side heat flow density detecting means located in the center of the surface of the object to be measured are moved in the thickness direction. When detecting the heat flow density, the surface temperature of the object to be measured on the outer peripheral side of the high temperature side and low temperature side heat flow density detecting means is the surface temperature of the center part of the object to be measured where the high temperature side and low temperature side heat flow density detecting means is located. Since the temperature is adjusted to be uniform, the heat transfer in the lateral direction on the surface of the object to be measured is suppressed, and the heat flow density in the thickness direction can be accurately detected.

  Further, the thermophysical property measuring apparatus of the present invention is in contact with the central portion of one of the two opposing surfaces perpendicular to the thickness direction of the plate-like object to be measured, on the one surface of the object to be measured. A first high-temperature side adjuster that adjusts the temperature of the central portion to a high temperature zone; and an outer peripheral portion of the one surface of the object to be measured that is located on the outer peripheral side of the first high-temperature side adjuster, and A second high-temperature side adjuster for adjusting the temperature of the outer peripheral portion of the one surface of the device under test to a high temperature zone, and the other surface of the two surfaces facing each other perpendicular to the thickness direction of the device under test A first low-temperature side regulator that adjusts the temperature of the central portion of the other surface of the object to be measured to a low temperature zone, and an outer peripheral side of the first low-temperature side regulator. The temperature of the outer peripheral portion of the other surface of the object to be measured is in contact with the outer peripheral portion of the other surface of the object to be measured. A second low temperature side adjuster that adjusts the temperature to a low temperature zone, the first high temperature side adjuster and the first temperature so that the one surface temperature of the object to be measured is uniform in a predetermined high temperature zone. And adjusting the output of the second high temperature side adjuster, and the first low temperature side adjuster and the second low temperature so that the other surface temperature of the object to be measured is uniform in a predetermined low temperature zone. Temperature control means for adjusting the output of the side adjuster, high temperature side heat flow density detecting means for detecting the heat flow density from the first high temperature side adjuster toward the object to be measured, and the first object from the object to be measured. A low-temperature-side heat flow density detecting means for detecting the heat-flow density toward the low-temperature side regulator.

  Thereby, the upper and lower surfaces of the object to be measured are heated or cooled by the first and second high temperature side conditioners and the first and second low temperature side conditioners to provide a temperature difference, and the surface area of the object to be measured When detecting the heat flow density in the thickness direction by the high temperature side heat flow density detection means and the low temperature side heat flow density detection means, the surface temperature of the object to be measured on the outer periphery side of the high temperature side and the low temperature side heat flow density detection means is The temperature control means controls the outputs of the first and second high-temperature side regulators and the first temperature so that the surface temperature is uniform with the surface temperature of the central part of the measurement object where the high-temperature side and low-temperature side heat flow density detection means are located. Since the output of the second low-temperature side regulator is adjusted, the heat transfer in the lateral direction on the surface of the object to be measured is suppressed, and the heat flow density in the thickness direction can be detected with high accuracy.

  According to the present invention, the upper and lower surfaces of the object to be measured are heated or cooled to provide a temperature difference, and the thickness is determined by the high temperature side heat flow density detecting means and the low temperature side heat flow density detecting means located at the center of the surface of the object to be measured. When the heat flow density in the direction is detected, the surface temperature of the object to be measured on the outer periphery side of the high temperature side and low temperature side heat flow density detection means is the center temperature of the object to be measured where the high temperature side and low temperature side heat flow density detection means are located. Since the temperature is adjusted to be equal to the surface temperature, the heat transfer in the lateral direction on the surface of the object to be measured is suppressed, and the heat flow density in the thickness direction can be accurately detected.

  The thermophysical property measuring method according to claim 1 of the present invention is characterized in that the first high-temperature side adjuster is formed at the center of one of the two opposing surfaces perpendicular to the thickness direction of the plate-like object to be measured. And a second high temperature side adjuster located on the outer peripheral side of the first high temperature side adjuster is brought into contact with the outer peripheral portion of the one surface of the object to be measured to thereby make a first low temperature The side adjuster is brought into contact with the central portion of the other surface of the two opposing surfaces perpendicular to the thickness direction of the plate-like object to be measured, and is positioned on the outer peripheral side of the first low-temperature side adjuster. A second low temperature side adjuster is brought into contact with the outer peripheral portion of the other surface of the object to be measured, and the first surface temperature of the object to be measured is uniform in a predetermined high temperature zone. Adjusting the outputs of the first high-temperature side regulator and the second high-temperature side regulator, and the other of the measured objects After adjusting the outputs of the first low temperature side regulator and the second low temperature side regulator so that the surface temperature is uniform in a predetermined low temperature zone, The heat flow density toward the measurement object is detected by the high temperature side heat flow density detection means, and the heat flow density from the object to be measured toward the first low temperature side regulator is detected by the low temperature side heat flow density detection means, and the high temperature side heat flow is detected. The heat flow density in the thickness direction of the object to be measured is obtained based on the heat flow density detected by the density detection means and the heat flow density detected by the low temperature side heat flow density detection means.

  Thereby, the upper and lower surfaces of the object to be measured are heated or cooled to provide a temperature difference, and the high temperature side heat flow density detecting means and the low temperature side heat flow density detecting means located in the center of the surface of the object to be measured are moved in the thickness direction. When detecting the heat flow density, the surface temperature of the object to be measured on the outer peripheral side of the high temperature side and low temperature side heat flow density detecting means is the surface temperature of the center part of the object to be measured where the high temperature side and low temperature side heat flow density detecting means is located. Since the temperature is adjusted to be uniform, the heat transfer in the lateral direction on the surface of the object to be measured is suppressed, and the heat flow density in the thickness direction can be accurately detected.

  Moreover, the invention of the thermophysical property measuring method according to claim 2 is the invention according to claim 1, wherein the high temperature side heat flow density detecting means is brought into contact with the object to be measured on a smaller surface than the first high temperature side regulator. And the low temperature side heat flow density detecting means is brought into contact with the object to be measured on a smaller surface than the first low temperature side adjuster, and the heat flow density in the surface of the object to be measured is detected. The heat transfer in the lateral direction is further suppressed, and the heat flow density in the thickness direction can be detected with high accuracy.

  Further, the invention of the thermophysical property measuring method according to claim 3 is the invention according to claim 1 or 2, wherein the high temperature side adjusting means comprising the first high temperature side regulator and the second high temperature side regulator; The high temperature side adjustment means and the low temperature side adjustment are configured such that the interval between the low temperature side adjustment means including the first low temperature side adjuster and the second low temperature side adjuster can be adjusted and the interval can be measured. The thickness of the measurement object is measured based on the distance between the high temperature side adjustment means and the low temperature side adjustment means when the measurement object is sandwiched between the high temperature side heat flow density detection means and the low temperature side heat flow density detection. The heat conductivity of the object to be measured is calculated based on the heat flow density obtained by the means and the thickness of the object to be measured, and the heat flow density in the surface of the object to be measured is detected. The heat transfer in the transverse direction is further suppressed, and the heat flow density in the thickness direction can be detected accurately. In addition to, it is possible to calculate the useful heat conductivity as an indicator of the heat insulating performance of the insulation.

  According to a fourth aspect of the present invention, there is provided a thermophysical property measuring method in which the object to be measured according to any one of claims 1 to 3 is a vacuum heat insulating material and has a fin portion. The heat flow in the surface of the object to be measured is further restrained from the heat transfer in the lateral direction of the detection unit, and the heat flow density in the thickness direction can be detected with high accuracy.

  Further, the invention of the thermophysical property measuring method according to claim 5 is the invention according to any one of claims 1 to 4, wherein the dehumidifying means for dehumidifying the space in which the object to be measured is disposed, After the humidity of the space in which the object to be measured is arranged is set to a predetermined humidity or lower, the heat flow density from the first high temperature side adjuster to the object to be measured is detected by the high temperature side heat flow density detecting means, and the object to be measured The heat flow density toward the first low-temperature side regulator is detected by the low-temperature side heat flow density detecting means, and the influence of humidity in the atmosphere is suppressed, and the heat flow density in the surface of the object to be measured The heat transfer in the lateral direction of the detection unit is further suppressed, and the heat flow density in the thickness direction can be accurately detected.

  The invention of a thermophysical property measuring apparatus according to claim 6 is in contact with a central portion of one of two opposing surfaces perpendicular to the thickness direction in a plate-like object to be measured. A first high temperature side adjuster that adjusts the temperature of the central portion of the one surface to a high temperature zone; and an outer periphery of the one surface of the object to be measured that is located on the outer peripheral side of the first high temperature side adjuster A second high-temperature side adjuster that abuts the portion and adjusts the temperature of the outer peripheral portion of the one surface of the object to be measured to a high temperature zone, and two opposing surfaces perpendicular to the thickness direction of the object to be measured. A first low-temperature side adjuster that contacts the central portion of the other surface and adjusts the temperature of the central portion of the other surface of the object to be measured to a low temperature zone; and The other surface of the object to be measured is located on the outer peripheral side and is in contact with the outer peripheral part of the other surface of the object to be measured. A second low-temperature side adjuster that adjusts the temperature of the outer periphery of the object to a low temperature zone, and the first high-temperature side so that the one surface temperature of the object to be measured is uniform in a predetermined high temperature zone Adjusting the outputs of the adjuster and the second high temperature side adjuster and the first low temperature side adjuster so that the other surface temperature of the object to be measured is uniform in a predetermined low temperature zone; Temperature control means for adjusting the output of the second low-temperature side regulator, high-temperature side heat flow density detection means for sensing the heat flow density from the first high-temperature side regulator toward the measurement object, and the measurement object And a low temperature side heat flow density detecting means for detecting the heat flow density toward the first low temperature side regulator.

  Thereby, the upper and lower surfaces of the object to be measured are heated or cooled by the first and second high temperature side conditioners and the first and second low temperature side conditioners to provide a temperature difference, and the surface area of the object to be measured When detecting the heat flow density in the thickness direction by the high temperature side heat flow density detection means and the low temperature side heat flow density detection means, the surface temperature of the object to be measured on the outer periphery side of the high temperature side and the low temperature side heat flow density detection means is The temperature control means controls the outputs of the first and second high-temperature side regulators and the first temperature so that the surface temperature is uniform with the surface temperature of the central part of the measurement object where the high-temperature side and low-temperature side heat flow density detection means are located. Since the output of the second low-temperature side regulator is adjusted, the heat transfer in the lateral direction on the surface of the object to be measured is suppressed, and the heat flow density in the thickness direction can be detected with high accuracy.

  Further, in the thermophysical property measuring apparatus according to claim 7, the high temperature side heat flow density detecting means in the invention according to claim 6 is in contact with the object to be measured on a smaller surface than the first high temperature side regulator. The low-temperature side heat flow density detecting means is in contact with the object to be measured on a smaller surface than the first low-temperature side adjuster, and the heat flow density in the surface of the object to be measured is measured next to the detection unit. The heat transfer in the direction is further suppressed, and the heat flow density in the thickness direction can be accurately detected.

  According to an eighth aspect of the present invention, there is provided the thermophysical property measuring apparatus according to the sixth or seventh aspect, wherein the high temperature side adjusting means comprises a first high temperature side regulator and a second high temperature side regulator. The high temperature side adjusting means and the low temperature side adjusting means are configured to be capable of adjusting the distance between the low temperature side adjusting means including the first low temperature side adjuster and the second low temperature side adjuster and capable of measuring the distance. And a thickness measuring means for measuring the thickness of the object to be measured based on an interval between the high temperature side adjusting means and the low temperature side adjusting means when the object to be measured is sandwiched between Thermal conductivity useful as an index of the heat insulation performance of the heat insulating material from the thickness of the object measured by the thickness measuring means and the average value of the heat flow density measured by the high temperature side heat flow density detecting means and the low temperature side heat flow density detecting means The rate can be calculated.

  In addition to the invention according to any one of claims 6 to 8, the invention of the thermophysical property measuring apparatus according to claim 9 includes a dehumidifying means for dehumidifying the space in which the object to be measured is arranged. By dehumidifying the measurement atmosphere with the dehumidifying means, the influence of the humidity in the atmosphere is suppressed, and the heat flow density in the surface of the object to be measured is changed in the lateral direction of the detection unit. Further, the heat flow density in the thickness direction can be accurately detected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic sectional view of a thermophysical property measuring apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a thermophysical property measuring apparatus 101 includes a high temperature side adjusting means 103 that can move up and down on the top side in a measurement chamber 102 and a low temperature side adjusting means 104 fixed on the bottom side. A vacuum heat insulating material, which is the object to be measured 105, is allowed to stand on the side adjusting means 104, and the high temperature side adjusting means 103 is lowered from above to sandwich the object to be measured 105.

  The vacuum heat insulating material that is the object to be measured 105 has a configuration in which a core material 106 and a moisture adsorbent 107 that are powder or foamed resin are inserted into a bag-shaped outer covering material 108 and the inside is decompressed to 10 Pa or less. In general, when a bag body is manufactured with the jacket material 108, two sheet-like peripheral portions are heat-welded, so that the heat-welded portion is a fin without the core material 106.

  The high temperature side adjusting means 103 is connected by a motor 109 and a shaft 110. Further, inside the high temperature side adjusting means 103, a first high temperature side regulator 111 for adjusting the central portion to a predetermined temperature and a second high temperature side regulator 112 for adjusting the temperature outside thereof are provided. . The second high temperature side adjuster 112 may be arranged so as to surround a ring shape in accordance with the shape of the first high temperature side adjuster 111, or a plurality of the high temperature side adjusters 112 may be arranged around the periphery.

  Usually, the first high temperature side regulator 111 and the second high temperature side regulator 112 use an electric heater, a Peltier element, or the like, and are set to a temperature higher than room temperature. Further, a high temperature side heat flow density detecting means 113 is provided below the first high temperature side adjuster 111 to detect the heat flow density flowing from the high temperature side adjusting means 103 to the object 105 to be measured.

  The low temperature side adjusting means 104 is provided with a first low temperature side adjuster 114 that adjusts the central portion to a predetermined temperature, and a second low temperature side adjuster 115 that adjusts the temperature outside thereof. The first low temperature side adjuster 114 and the second low temperature side adjuster 115 are generally set to a temperature lower than room temperature by circulating cooling water, brine, or the like. Further, a low-temperature side heat flow density detection means 116 is provided below the first low-temperature side adjuster 114 to detect the heat flow density flowing from the DUT 105 to the low-temperature side adjustment means 104.

  When the relative humidity in the measurement chamber 102 is high, moisture in the atmosphere is condensed on the surface of the low-temperature side adjusting means 104, and the condensation heat transfer affects the detection value of the low-temperature side heat flow density detecting means 116. A dehumidifying means 117 provided outside the measurement chamber 102 and the thermophysical property measuring apparatus 101 is connected by a pipe 118, and an open / close valve 119 is provided on the pipe 118.

  The control device 120 includes a thickness measuring means 121, a temperature control means 122, a high temperature side heat flow density meter 123, a low temperature side heat flow density meter 124, and a dehumidification control means 125. The thickness measuring means 121 is the motor 109, the temperature control means 122 is the high temperature side adjusting means 103 and the low temperature side adjusting means 104, the high temperature side heat flow density meter 123 is the high temperature side heat flow density detecting means 113, and the low temperature side heat flow density meter 124 is The low temperature side heat flow density detecting means 116 and the dehumidifying control means 125 are wired to the dehumidifying means 117, respectively.

  The operation of the thermophysical property measuring apparatus configured as described above will be described below.

  First, the high temperature side adjusting means 103 is lowered until it comes into contact with the low temperature side adjusting means 104 while the measurement chamber 102 is empty. Using this state as the zero point, the high temperature side adjusting means 103 is raised until it comes into contact with the top surface of the measurement chamber 102, and the rotation speed of the motor 109 from the zero point is stored in the thickness measuring means 121.

  Next, after the object to be measured 105 is left on the low temperature side adjusting means 104, the high temperature side adjusting means 103 is lowered again until it comes into contact with the object to be measured 105. A value obtained by converting a value obtained by subtracting the number of revolutions required for the descent from the number of revolutions previously measured is the thickness of the DUT 105. The thickness of the object 105 may be measured in advance using a thickness gauge or the like and manually input to the control unit 120.

  When the positioning of the high temperature side adjusting means 103 is completed, the temperature control means 121 adjusts the high temperature side adjusting means 103 and the low temperature side adjusting means 104 to a predetermined temperature. For example, the high temperature side adjusting means 103 can be set between 10 and 100 ° C., and the low temperature side adjusting means 104 can be set between −20 and 20 ° C.

  In the high temperature side adjusting means 103, the first high temperature side regulator 111 at the center and the second high temperature side regulator 112 outside thereof can be controlled independently. Also, the low temperature side adjusting means 104 can be controlled independently of the first low temperature side adjuster 114 at the center and the second low temperature side adjuster 115 outside.

  When measuring the object to be measured 105 having a fin such as a vacuum heat insulating material, the second high temperature side adjuster 112 and the second low temperature side adjuster 114 have a portion that does not come into contact with the object to be measured 105. Compared with the first high temperature side regulator 111 and the first low temperature side regulator 113, the output is increased and the heating or cooling capacity is increased.

  Further, when the humidity of the space where the object 105 is not measured is high between the high temperature side adjustment unit 103 and the low temperature side adjustment unit 104, the temperature adjustment becomes unstable due to moisture condensation on the surface of the low temperature side adjustment unit 104. Therefore, dehumidification is performed by the dehumidifying means 117 until the humidity is previously recorded in the dehumidifying control means 125.

  After the temperature of the high temperature side and low temperature side of the object 105 to be measured is stabilized, the heat flow density in the vicinity of the center of the object 105 is measured by the high temperature side heat flow density detecting means 113 and the low temperature side heat flow density detecting means 116, and the average value thereof. From this, the heat flow density of the DUT 105 is calculated.

  Moreover, the value which remove | divided this value by thickness is thermal conductivity, and is effective as a parameter | index which evaluates the heat insulation performance of a heat insulating material. In addition, the quality of a vacuum heat insulating material can be improved by applying the thermophysical property measuring apparatus 101 to the manufacturing process of a vacuum heat insulating material.

  As described above, in the thermophysical property measurement method of the present embodiment, the first high temperature side adjuster 111 is placed on one of the two surfaces facing each other perpendicular to the thickness direction of the plate-like object to be measured 105. While making it contact | abut with a center part, the 2nd high temperature side regulator 112 located in the outer peripheral side of the 1st high temperature side regulator 111 is made to contact | abut with the outer peripheral part of one surface of the to-be-measured object 105, and 1st The low temperature side adjuster 114 is brought into contact with the center portion of the other surface of the two opposite surfaces perpendicular to the thickness direction of the plate-like object to be measured 105, and the outer peripheral side of the first low temperature side adjuster 114. The second low-temperature side adjuster 115 positioned at the position is brought into contact with the outer peripheral portion of the other surface of the object to be measured 105 so that the surface temperature of one of the objects to be measured 105 is uniform in a predetermined high temperature zone. Adjust the outputs of the first high temperature side regulator 111 and the second high temperature side regulator 112. In addition, after adjusting the outputs of the first low temperature side adjuster 114 and the second low temperature side adjuster 115 so that the other surface temperature of the DUT 105 is uniform in a predetermined low temperature zone, The high-temperature side heat flow density detector 113 detects the heat flow density from one high-temperature side adjuster 111 toward the object to be measured 105, and the low-temperature side heat flow determines the heat flow density from the object to be measured 105 toward the first low-temperature side adjuster 114. Based on the heat flow density detected by the density detection means 116 and detected by the high temperature side heat flow density detection means 113 and the heat flow density detected by the low temperature side heat flow density detection means 116, the heat flow density in the thickness direction of the DUT 105 is measured. To get.

  Thus, the upper and lower surfaces of the object 105 to be measured are heated or cooled to provide a temperature difference, and the high temperature side heat flow density detecting means 113 and the low temperature side heat flow density detecting means 116 located at the center of the surface of the object 105 to be measured, When detecting the heat flow density in the thickness direction, the surface temperature of the object 105 on the outer periphery side of the high temperature side and low temperature side heat flow density detection means 113, 116 is the position of the high temperature side and low temperature side heat flow density detection means 113, 116. Since the temperature is adjusted so as to be uniform with the surface temperature of the center of the object 105 to be measured, heat transfer in the lateral direction of the surface of the object 105 to be measured is suppressed, and the heat flow density in the thickness direction is accurate. It becomes possible to detect.

  Further, since there is almost no temperature gradient in the direction perpendicular to the thickness of the DUT 105, the heat flow density is also suppressed. That is, since the heat flow from the high temperature side to the low temperature side of the device under test 105 is almost only in the thickness direction, it has a fin shape like the vacuum heat insulating material of the device under test 105 and further has a heat resistance in the thickness direction. Even if the heat insulating material is large and heat flow is likely to occur in a direction perpendicular to the thickness, the thermophysical properties can be accurately measured.

  Further, the high temperature side heat flow density detecting means 113 is brought into contact with the DUT 105 on a surface smaller than the first high temperature side adjuster 111, and the low temperature side heat flow density detecting means 116 is brought into contact with the first low temperature side adjuster 114. Since the surface to be measured 105 is brought into contact with the surface 105 to be measured, the heat flow density in the surface of the object 105 to be measured is further suppressed in the lateral movement of the detection unit, and the heat flow density in the thickness direction can be accurately detected. It becomes possible.

  Moreover, the low temperature which consists of the high temperature side adjustment means 103 which consists of the 1st high temperature side regulator 111 and the 2nd high temperature side regulator 112, the 1st low temperature side regulator 114, and the 2nd low temperature side regulator 115. The high temperature side adjusting means 103 when the object 105 is sandwiched between the high temperature side adjusting means 103 and the low temperature side adjusting means 104 is configured so that the interval with the side adjusting means 104 can be adjusted and the distance can be measured. The thickness of the object to be measured 105 is measured based on the distance from the low temperature side adjusting means 104, and the heat flow density obtained by the high temperature side heat flow density detecting means 113 and the low temperature side heat flow density detecting means 116 and the thickness of the object to be measured 105 are measured. Since the thermal conductivity of the device under test 105 is calculated based on the above, the heat flow density in the surface of the device under test 105 is further suppressed in the lateral direction of the detection unit, and the heat flow density in the thickness direction is detected accurately. In addition to doing heat insulation of insulation Allowing calculation of useful heat conductivity as an indicator of performance.

  In addition, the object to be measured 105 is a vacuum heat insulating material, and the heat flow in the surface of the object to be measured having a fin portion is further restrained from heat transfer in the lateral direction of the detection unit, and the heat flow density in the thickness direction is accurate. It becomes possible to detect well.

  Further, the dehumidifying means 117 for dehumidifying the space in which the object to be measured 105 is disposed is used to reduce the humidity of the space in which the object to be measured 105 is disposed to a predetermined humidity or less, and then the first high-temperature side adjuster 111 performs measurement. The heat flow density toward the measurement object 105 is detected by the high temperature side heat flow density detection means 113 and the heat flow density from the measurement object 105 toward the first low temperature side adjuster 114 is detected by the low temperature side heat flow density detection means 116. The influence of humidity in the atmosphere is suppressed, the heat flow density in the surface of the object 105 to be measured is further suppressed from moving in the lateral direction of the detection unit, and the heat flow density in the thickness direction can be accurately detected. .

  Further, the thermophysical property measuring apparatus according to the present embodiment is in contact with the central portion of one of the two opposing surfaces perpendicular to the thickness direction of the plate-like object to be measured 105, and is one of the objects to be measured 105. A first high temperature side adjuster 111 that adjusts the temperature of the central portion of the surface to a high temperature zone, and an outer peripheral portion of one surface of the object 105 to be measured located on the outer peripheral side of the first high temperature side adjuster 111. A second high-temperature side adjuster 112 that adjusts the temperature of the outer peripheral portion of one surface of the object 105 to be measured to a high temperature zone, and the other of the two opposing surfaces perpendicular to the thickness direction of the object 105 to be measured A first low-temperature side adjuster 114 that abuts the central portion of the surface of the target object 105 and adjusts the temperature of the central portion of the other surface of the object 105 to be measured to a low temperature zone, and an outer peripheral side of the first low-temperature side adjuster 114. The object to be measured 105 that is positioned and abuts the outer peripheral portion of the other surface of the object to be measured 105 A second low-temperature side adjuster 115 that adjusts the temperature of the outer peripheral portion of the other surface to a low temperature zone, and a first temperature so that one surface temperature of the DUT 105 is uniform in a predetermined high temperature zone. While adjusting the outputs of the high temperature side adjuster 111 and the second high temperature side adjuster 112, the first low temperature side adjuster so that the other surface temperature of the DUT 105 is uniform in a predetermined low temperature zone. 114 and the temperature control means 122 for adjusting the output of the second low temperature side adjuster 115, the high temperature side heat flow density detection means 113 for detecting the heat flow density from the first high temperature side adjuster 111 toward the object 105 to be measured, A low-temperature side heat flow density detecting means 116 for detecting the heat flow density from the DUT 105 toward the first low-temperature side regulator 114 is provided.

  As a result, the first and second high temperature side adjusters 111 and 112 and the first and second low temperature side adjusters 114 and 115 are used to heat or cool the upper and lower surfaces of the object 105 to provide a temperature difference. When the heat flow density in the thickness direction is detected by the high temperature side heat flow density detection means 113 and the low temperature side heat flow density detection means 116 located at the center of the surface of the object 105, the high temperature side and low temperature side heat flow density detection means 113 are detected. , 116 is such that the surface temperature of the object 105 on the outer peripheral side is uniform with the surface temperature of the center of the object 105 where the high-temperature side and low-temperature side heat flow density detecting means 113, 116 are located. Since the control means 122 adjusts the outputs of the first and second high temperature side adjusters 111 and 112 and the outputs of the first and second low temperature side adjusters 114 and 115, Heat transfer in the direction Is braking, the heat flow density in the thickness direction becomes possible to accurately detect.

  Further, the high temperature side heat flow density detecting means 113 comes into contact with the DUT 105 on a surface smaller than the first high temperature side adjuster 111, and the low temperature side heat flow density detecting means 116 is supplied from the first low temperature side adjuster 114. Since the contact with the object 105 to be measured is a small surface, the heat flow density in the surface of the object 105 is further suppressed in the lateral direction of the detection unit, and the heat flow density in the thickness direction can be accurately detected. become.

  Moreover, the low temperature which consists of the high temperature side adjustment means 103 which consists of the 1st high temperature side regulator 111 and the 2nd high temperature side regulator 112, the 1st low temperature side regulator 114, and the 2nd low temperature side regulator 115. The high temperature side adjusting means 103 and the low temperature when the object to be measured 105 is sandwiched between the high temperature side adjusting means 103 and the low temperature side adjusting means 104 are configured so that the distance between the high temperature side adjusting means 103 and the low temperature side adjusting means 104 can be measured. Since the thickness measuring means 121 for measuring the thickness of the measured object 105 based on the distance from the side adjusting means 104 is provided, the thickness of the measured object 105 measured by the thickness measuring means 121 and the high temperature side heat flow density detecting means 113 are provided. And the average value of the heat flow density measured by the low temperature side heat flow density detecting means 116, it is possible to calculate a thermal conductivity useful as an index of the heat insulating performance of the heat insulating material.

  Further, since the dehumidifying means 117 for dehumidifying the space in which the measured object 105 is disposed is provided, the measurement atmosphere is dehumidified by the dehumidifying means 117, thereby suppressing the influence of humidity in the atmosphere, and the surface of the measured object 105 The heat transfer in the horizontal direction of the detector is further suppressed, and the heat flow density in the thickness direction can be accurately detected.

  As described above, the thermophysical property measuring method and apparatus according to the present invention has a large heat resistance and a heat flow density in the thickness direction of a plate-like object to be measured which makes it difficult to make the temperatures of two opposing surfaces perpendicular to the thickness direction uniform. In addition, since the thermal conductivity can be measured with high accuracy, it is suitable for measuring the thermal properties of a heat insulating material such as a vacuum heat insulating material.

1 is a schematic cross-sectional view of a thermophysical property measuring apparatus according to Embodiment 1 of the present invention. Schematic sectional view showing the structure of a conventional thermal conductivity measuring device

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Thermophysical property measuring apparatus 103 High temperature side adjustment means 104 Low temperature side adjustment means 105 Measured object (vacuum heat insulating material)
111 1st high temperature side regulator 112 2nd high temperature side regulator 113 High temperature side heat flow density detection means 114 1st low temperature side regulator 115 2nd low temperature side regulator 116 Low temperature side heat flow density detection means 117 Dehumidification means 121 Thickness measuring means 122 Temperature control means

Claims (9)

The first high-temperature side adjuster is brought into contact with the central portion of one of two opposing surfaces perpendicular to the thickness direction of the plate-shaped object to be measured, and the outer periphery of the first high-temperature side adjuster A second high temperature side adjuster located on the side of the object to be in contact with the outer peripheral portion of the one surface of the object to be measured;
The first low temperature side adjuster is brought into contact with the center of the other surface of the two opposite surfaces perpendicular to the thickness direction of the plate-shaped object to be measured, and the outer periphery of the first low temperature side adjuster A second low-temperature side adjuster located on the side of the object to be in contact with the outer peripheral portion of the other surface of the object to be measured
The outputs of the first high temperature side regulator and the second high temperature side regulator are adjusted so that the one surface temperature of the object to be measured is uniform in a predetermined high temperature zone, and the measurement object After adjusting the outputs of the first low temperature side regulator and the second low temperature side regulator so that the other surface temperature of the object is uniform in a predetermined low temperature zone,
The heat flow density from the first high temperature side adjuster toward the object to be measured is detected by the high temperature side heat flow density detecting means, and the heat flow density from the object to be measured to the first low temperature side adjuster is detected as the low temperature side heat flow. Detect with density detection means,
A heat physical property in the thickness direction of the object to be measured is obtained based on the heat flow density detected by the high temperature side heat flow density detecting means and the heat flow density detected by the low temperature side heat flow density detecting means. Measuring method.   The high temperature side heat flow density detecting means is brought into contact with the object to be measured on a surface smaller than the first high temperature side regulator, and the low temperature side heat flow density detecting means is arranged on the surface smaller than the first low temperature side regulator. The thermophysical property measuring method according to claim 1, wherein the method is brought into contact with the object to be measured.   The interval between the high temperature side adjusting means comprising the first high temperature side regulator and the second high temperature side regulator, and the low temperature side adjusting means comprising the first low temperature side regulator and the second low temperature side regulator. The distance between the high temperature side adjusting means and the low temperature side adjusting means when the object to be measured is sandwiched between the high temperature side adjusting means and the low temperature side adjusting means is configured to be adjustable and measure the interval. The thickness of the object to be measured is measured, and the thermal conductivity of the object to be measured is based on the heat flow density obtained by the high temperature side heat flow density detecting means and the low temperature side heat flow density detecting means and the thickness of the object to be measured. The thermophysical property measuring method according to claim 1, wherein the thermophysical property measuring method is calculated.   The thermophysical property measuring method according to any one of claims 1 to 3, wherein the object to be measured is a vacuum heat insulating material.   Using the dehumidifying means for dehumidifying the space in which the object to be measured is disposed, the humidity in the space in which the object to be measured is disposed is set to a predetermined humidity or less, and then the first high-temperature side controller is directed to the object to be measured. The heat flow density is detected by the high temperature side heat flow density detecting means, and the heat flow density from the object to be measured toward the first low temperature side regulator is detected by the low temperature side heat flow density detecting means. The thermophysical property measuring method according to any one of the above. The temperature of the central part of the one surface of the object to be measured is adjusted to a high temperature zone by contacting the central part of one of the two opposing surfaces perpendicular to the thickness direction of the plate-shaped object to be measured. A first high temperature side regulator;
It is located on the outer peripheral side of the first high-temperature side adjuster and abuts on the outer peripheral portion of the one surface of the device under test to adjust the temperature of the outer peripheral portion of the one surface of the device under test to a high temperature zone. A second high temperature side regulator;
A first temperature adjusting the temperature of the center of the other surface of the object to be measured to a low temperature zone by contacting the center of the other surface of the two surfaces perpendicular to the thickness direction of the object to be measured. The low temperature side of the
The temperature of the outer peripheral portion of the other surface of the object to be measured is adjusted to a low temperature zone by being in contact with the outer peripheral portion of the other surface of the object to be measured and positioned on the outer peripheral side of the first low temperature side adjuster. A second low temperature regulator;
The outputs of the first high temperature side regulator and the second high temperature side regulator are adjusted so that the one surface temperature of the object to be measured is uniform in a predetermined high temperature zone, and the measurement object Temperature control means for adjusting the outputs of the first low temperature side regulator and the second low temperature side regulator so that the other surface temperature of the object becomes uniform in a predetermined low temperature zone;
High temperature side heat flow density detecting means for detecting a heat flow density from the first high temperature side regulator toward the object to be measured;
A thermophysical property measuring apparatus comprising: a low temperature side heat flow density detecting means for detecting a heat flow density from the object to be measured toward the first low temperature side adjuster.   The high temperature side heat flow density detecting means is in contact with the object to be measured on a surface smaller than the first high temperature side regulator, and the low temperature side heat flow density detecting means is on the surface to be measured on a smaller surface than the first low temperature side regulator. The thermophysical property measuring apparatus according to claim 6, wherein the thermophysical property measuring apparatus is in contact with an object.   The interval between the high temperature side adjusting means comprising the first high temperature side regulator and the second high temperature side regulator, and the low temperature side adjusting means comprising the first low temperature side regulator and the second low temperature side regulator. Based on the interval between the high temperature side adjusting means and the low temperature side adjusting means when the object to be measured is sandwiched between the high temperature side adjusting means and the low temperature side adjusting means. The thermophysical property measuring apparatus according to claim 6 or 7, further comprising a thickness measuring means for measuring the thickness of the object to be measured.   The thermophysical property measuring apparatus according to any one of claims 6 to 8, further comprising a dehumidifying means for dehumidifying a space in which the object to be measured is disposed.