JP2001021512A - Thermal conductivity measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal conductivity measuring device capable of obtaining highly precisely the thermal conductivity value of a plate member in which a filler or the like is used. SOLUTION: This thermal conductivity measuring device 1 is equipped with an electric heating element 31, a heat transfer body 32 for a heating element part, the heating element part 3 having a mounting body 39 for a thermocouple 8A, a heat transfer body 41 for a radiator part, a mounting body 49 for a thermocouple 8D, the radiator part 4 having a water- cooling radiator 43, an intermediate mounting body 5 for thermocouples 8B, 8C, an adiabatic layer 6 having a heat insulating body 61 for covering the upper part of the electric heating element 31 and a heat insulator 62 for covering the side faces of the heating element part 3, the heat transfer body 41 or the like, and a presser plate 7 arranged on the upper surface of the heat insulating body 61. With this formation, a measuring object 19 whose thermal conductivity is required to be obtained is inserted between the mounting body 39 and the intermediate mounting body 5, and a known sample member 18 having a known thermal conductivity is inserted between the intermediate mounting body 5 and the mounting body 49, and the thermal conductivity of the measuring object 19 is obtained by using the thermal conductivity of the known sample member 18 and the ratio of the output difference between the thermocouples 8A, 8B with respect to the output difference between the thermocouples 8C, 8D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal conductivity measuring device for measuring the thermal conductivity of a flat object to be measured.
The present invention relates to a configuration that enables high-precision measurement of thermal conductivity even for a measurement target such as an RP material having a local thermal conductivity value that is not uniform in a plane direction.

[0002]

2. Description of the Related Art Many types of flat electrical insulators such as an electrical insulating film are used for electrical insulation of an electric machine. A thermal conductivity measuring device for members is used. An apparatus disclosed in JP-A-53-107382 is known as an apparatus capable of determining the thermal conductivity of a flat member having an extremely small thickness of 0.1 [mm] or less. . Hereinafter, a conventional thermal conductivity measuring device for a flat member will be described with reference to FIG. 8 based on the contents of a device known in this publication. FIG. 8 is a longitudinal sectional view showing a main part of a conventional thermal conductivity measuring device for a flat member together with a measurement object. Note that FIG. 8 shows a state in which the members constituting the thermal conductivity measuring device and the object to be measured are expanded.

In FIG. 8, reference numeral 9 denotes an electric heating element 92, a heat insulating layer 94 for the heating element 92, and a thermocouple 9 as a temperature detecting element.
This is a conventional example of a thermal conductivity measuring device for a plate-shaped member provided with a measuring tool 91 having a fifth member 5 and a heat transfer member 98. Heat insulation layer 94
Is formed in a rectangular parallelepiped shape using an asbestos plate as a heat insulating material, and an electric heating element 92 is provided on one surface thereof.
Electrical heating element 92 has an electric resistance value R, are formed in a flat plate shape having an area S ₉ using a nickel-chromium alloy heating wire having a rectangular cross-section, provided with a lead wire 93 and 93 for current supply This generates a heat flow to be applied to the measurement object 99 for measuring the thermal conductivity.

The vertical and horizontal dimensions of the electric heating element 92 are smaller than the surface of the heat insulating layer 94 on which the electric heating element 92 is provided, and therefore the surface 91 a of the measuring tool 91. The thermocouple 95 is made of chromel or alumel, and its temperature detecting unit is disposed at the center of the electric heating element 92 so as to be able to contact the object 99 to be measured. 97
have. The heat transfer body 98 is formed in a rectangular parallelepiped shape using alumina as a heat conductive material, and an air-cooling type, a water-cooling type, or the like (not shown) is provided on a surface 98b opposite to the rectangular flat surface 98a in contact with the measurement object 99. A cooling device is installed.

The object to be measured 99 which is a flat member has a thickness d.
One of the planes 99 a in the direction is connected to the electric heating element 92 of the measuring tool 91.
Is mounted on the thermal conductivity measuring device 9 with the other flat surface 99b in the thickness d direction being in close contact with the flat surface 98a of the heat transfer member 98. The measuring object 99 has a rectangular surface shape, and its vertical and horizontal dimensions are the surface 91 of the measuring tool 91.
a, and smaller than the plane 98 a of the heat transfer body 98. Then, the thermal conductivity measuring device 9 adjusts the planes 99a and 99b of the measurement object 99 to the surface 91 of the measuring tool 91.
in order to ensure close contact with the plane 98a of the a and the heat conductor 98, and the measurement instrument 91 includes a pressurization device (not shown) pressed in the direction of arrow F _9.

The conventional thermal conductivity measuring device 9 for a plate-like member is configured as described above, and the thermal conductivity λ _X of the object to be measured 99 can be obtained as follows. First, a constant current I is applied to the electric heating element 92 in each of a state where the measurement object 99 is loaded on the thermal conductivity measuring device 9 and a state where it is not loaded. When the temperature of each part becomes constant, such as when the output of the thermocouple 95 is saturated, the output of the thermocouple 95 is defined as a temperature rise value of a portion where the plane 99a of the measurement object 99 is in contact with the electric heating element 92. The temperature rise value t
_91, to measure the t _92. The thermal conductivity λ _X of the measurement object 99 having the thickness d is supplied to the electric heating element 92 with the temperature rise values t ₉₁ and t ₉₂ , the area S ₉ of the electric heating element 92, the electric resistance value R, and the like. The constant current I is obtained based on the equation (1).

[0007]

Λ _X = 2I ² Rd / ｛(2t ₉₁ -t ₉₂ ) S ₉ ｝... (1)

[0008]

The thermal conductivity measuring apparatus 9 for a flat member according to the prior art described above does not include a filler such as a polyester film, so that the thermal conductivity can be measured uniformly in the plane direction. An appropriate thermal conductivity value can be obtained for the body 99. However, a flat electrical insulator used for electrical insulation of an electric machine includes a filler such as an FRP material (for example, an epoxy glass laminate) in addition to a material that does not include a filler such as a polyester film. The materials used are also frequently used. A problem in the case where the thermal conductivity of such a material is obtained by the thermal conductivity measuring device 9 will be described by exemplifying a case where the measurement object 99 is an FRP material.

When the measurement object 99 is an FRP material, the thermal conductivity value of the measurement object 99 is not uniform in the plane direction due to the presence of a fiber (a glass fiber in the case of an epoxy glass laminate). Then, as is well known, the local thermal conductivity value of the measurement object 99 in the surface direction is larger in a portion where a large amount of fiber exists than in a portion where a large amount of resin material exists. Such an object to be measured 99
Is determined by the thermal conductivity measuring device 9, is the part of the temperature detection part of the thermocouple 95 in contact with the measurement object 99 a part with a large amount of fibers or a part with a large amount of resin material? The output value of the thermocouple 95 differs depending on the type. That is, the thermal conductivity measuring device 9 could not accurately determine the thermal conductivity value of the flat member using the filler or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a thermal conductivity measuring apparatus capable of accurately determining the thermal conductivity value of a flat member using a filler or the like. Is to provide.

[0011]

According to the present invention, there are provided the following objects: 1) having an electric heating element and a flat end face, and applying heat generated by the electric heating element to the object to be measured from the flat end face; A heating element having a heat transfer element for a heating element made of a heat conductive material and having a temperature detecting section for the heating element on the side of the planar end face; a radiator; and the electric heating element. The generated heat is received by the planar end face having substantially the same surface shape and dimensions as the planar end face of the heat transfer element for the heating element portion via the measurement object, transferred to the heat radiator, and is transferred to the flat end face side. A radiator having a heat conductor for a radiator made of a heat conductive material having a temperature detector for the radiator disposed substantially in opposition to the temperature detector for the heat generator; A heat transfer body for the heat radiator, a heat-insulating layer disposed around the object to be measured and the heat radiator, the heat radiator and the heat radiator Between the flat end faces of the heat transfer section and the heat transfer element for the heating element section.
2. The measurement object having dimensions is interposed, and respective flat surfaces on both sides of the measurement object are closely attached to the planar end surfaces of the heating element portion and the heat radiating portion; In the means of (1), the heating element and / or the radiator is a temperature detector for the heating element,
A mounting body for the temperature detecting unit for mounting the temperature detecting unit for the heat radiating unit side is provided on the measurement target body side, and this mounting body is made of a heat conductive material and is on the measurement target body side of the heat transfer body for the heating element unit. Or 3) In the means described in the above item 1 or 2, the electric heating element has a flat end face and a flat end face of a heat transfer element for a heating element portion. The heat generating portions are distributed and arranged in a range of substantially the same surface shape and dimensions, and the heat transfer body for the heat generating portion has an end surface which is in contact with the electric heat generating member substantially the same as the planar end surface on the measurement object side. Surface shape
4) In the means according to any one of the above items 1 to 3, furthermore, 4) in the means according to any one of the above items 1 to 3, between the heating element portion and the measurement object or between the measurement object and the heat radiation Between the body part, a temperature detection part is disposed at a position substantially opposite to the temperature detection part for the heating element part. An intermediate mounting body for the temperature detection part and a known heat conductivity made of a material having a known thermal conductivity. A sample member is provided, the known sample member is formed in a flat plate shape having substantially the same surface shape and dimensions as the object to be measured, and the intermediate mounting body is a flat end face on the object to be measured side of the heat transfer body for the heating element. This is achieved by being formed in a flat plate shape having substantially the same surface shape and dimensions and being disposed in contact with the measurement object.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 3 is a partially cutaway side view showing a thermal conductivity measuring apparatus for a flat plate member according to an embodiment of the present invention together with a measurement object, and FIG. 4 is a side view of the heating element section shown in FIG. FIG. 5 is a cross-sectional view of a heat transfer body taken along a line Q in FIG. 3, FIG. 5 is a view showing a main part of the heat radiator shown in FIG. 3, (a) is a top view, and (b) is FIG. It is a side view. 3 to 5, reference numeral 2 denotes a thermal conductivity measuring device for a flat member according to the present invention including a heating element 3A, a radiator 4A, a heat insulating layer 6, and a pressure plate 7, Reference numeral 19 denotes an object to be measured, which is interposed between the heat generator 3A and the heat radiator 4A. The measurement object 19 is a plate-shaped member having a thickness d, similarly to the measurement object 99 described in the section of “Prior Art”, and the material used includes an FRP material or the like.

The heating element 3A comprises an electric heating element 31 and a heating element.
And a heat transfer body 33 for use in the electric heater.
Measurement target for thermal conductivity measurement similar to electric heating element 92
A heat flow to be applied to the body 19 is generated. The heat transfer body 33 is
FRP material whose thermal conductivity value is non-uniform in the plane direction
And the like, and the heat generated by the electric heating element 31
Even if the area density of the
Flow at the part where the heat generated passes through the lower end face 33d
Plays a role in almost equalizing the density. For this
In this case, the heat transfer body 33 has good thermal conductivity.
It is formed in a rectangular parallelepiped shape using copper material
H_ThreeAre sufficient for fulfilling the role of the heat transfer body 33.
Longer dimension [in this case, the lower end face 33d
Area is S _ThreeAnd H_Three$ 0.4 (S_Three)^1/2]
Is set to

In this heat transfer body 33, the upper end face 33u and the lower end face 33d are formed in the same shape and dimensions and are flat, and the surface shape and dimensions are the same as those of the object 19 to be measured.
Same dimensions. A small diameter bottomed hole 33a is formed at the center of the lower end surface 33d of the heat transfer body 33, and a small diameter bottomed hole 33c is formed from the side surface of the heat transfer body 33 so as to be connected to the bottomed hole 33a. As shown in FIG. 4, a thermocouple 8A, which is a heating element side temperature detecting element, is loaded into the bottomed holes 33a and 33c. As the thermocouple 8A, a heat-resistant thermocouple in which a fluorine resin material is used for both the insulating coating material for the strand and the outer insulating material is adopted, and the ends of both strands are electrically connected by a known appropriate method. Thus, a temperature detecting section is formed. The thermocouple 8A is sequentially inserted into the bottomed hole 33c and the bottomed hole 33a, and the temperature detector is slightly protruded from the lower end surface 33d, and is fixed to the heat transfer body 33 by the filler 331.

The temperature detecting portion of the thermocouple 8A fixed to the bottomed hole 33a of the heat transfer body 33 is processed at the tip so as to be flush with the lower end face 33d (see FIG. 4). .
The electric heating element 31 is formed into a flat external shape having the same external shape and dimensions as the upper end surface 33u by coating a heating portion arranged in a planar shape by meandering a heating wire with a silicone rubber material. Using a flexible electric heater. The electric heating element 31 is formed by an upper end face 33 u of the heat transfer element 33.
Placed on Therefore, the uniformity of the density of the heat flow obtained on the upper end face 33u by the heat generated in the heating portion of the electric heating element 31 is improved as compared with the case where the electric heating element 92 of the conventional example is used. In addition, this electric heating element 31
A temperature sensor (not shown) for detecting the temperature of the electric heating element 31 is integrally mounted.

The radiator 4A is provided with a radiator 42 for the radiator.
And a heat radiator 43. The heat conductor 42 is formed by applying an FRP material or the like having a non-uniform thermal conductivity value in the plane direction to the measurement object 19, and furthermore, an area of heat removed by the heat radiator 43. Even if the density is not uniform, it plays the role of making the heat transmitted from the measurement object 19 to the heat transfer body 42 almost uniform in the density of the heat flow at the portion passing through the upper end surface 42u. If for this in this case, the heat conductor 42 is formed in a rectangular parallelepiped shape with a copper material which is a material having the same good thermal conductivity and the heat conductor 33, the thickness H ₄ is Den The dimension is set to a sufficiently long dimension necessary to fulfill the role of the heat body 42.

In this case, the heat transfer member 42 for the heat dissipating member has exactly the same structure, shape and dimensions as the heat transfer member 33 for the heat dissipating member. The only difference is that it is used upside down. Therefore, the thickness H ₄ of the heat transfer body 42 is the same as the thickness H ₃ of the heat transfer body 33,
The upper end surface 42u and the lower end surface 42d have the same shape and dimensions as the lower end surface 33d of the heat transfer body 33,
u has a bottomed hole for mounting the temperature detecting portion of the thermocouple 8D which is the temperature detecting element for the radiator portion side. Since the contents of the thermocouple 8D, the formation position of the bottomed hole, the method of loading the heat transfer body 42, and the like are exactly the same as those of the thermocouple 8A,
The description is omitted to avoid duplication.

The radiator 43 is a water-cooled radiator for removing heat using cooling water 49. As shown in FIG. 5, a radiator body 44 made of copper and having a rectangular parallelepiped shape and a plurality of pipe members 45 to 48 are provided. Have. Three parallel through holes 441 are formed in the radiator body 44 as shown in FIG.
Numeral 8 is water-tightly connected to the through hole 441 to form a continuous flow path for one continuous cooling water 49 as a whole. Note that the pipe member 45 is an inlet member through which the cooling water 49 flows in, and the pipe member 48 is an outlet member through which the cooling water 49 is discharged. The heat transfer body 42 can maintain the temperature of the lower end face 42d at a low temperature by attaching the heat radiator 43 in contact with the lower end face 42d.

Although the lower end face 42d of the heat transfer body 42 and the end face 43u of the heat radiator 43 which is in contact with the lower end face 42d are both smooth surfaces, in order to reduce the contact thermal resistance between them, the two end faces are formed. It is preferable to apply grease or a soft metal (for example, indium) foil or the like to the joint. Further, between the measurement object 19 and the lower end face 33d of the heat transfer body 33 and the upper end face 42u of the heat transfer body 42, or between the electric heating body 31 and the upper end face 33u of the heat transfer body 33.
During this time, grease or the like can be applied as necessary in order to reduce the contact thermal resistance between them.

The heat insulating layer 6 is formed of the electric heating element 3 of the heating element 3A.
A heat insulator 61 covering the upper portion of the heat generating member 1 and a heat insulator 62 disposed around the heating element portion 3A, the measurement object 19 and the heat transfer member 42;
It is composed of In this case, ceramic fibers [fineflex 1300 paper manufactured by Nichias Co., Ltd.] are used for the heat insulators 61 and 62 as a heat insulator having excellent heat insulation performance and good workability. According to the study of the thermal conductivity measuring device 2 by the inventors, the heat insulation layer 6 using Fineflex 1300 paper has a heat insulation performance exceeding 150 [%] as compared with the case of using the same asbestos plate as the conventional example. It has been confirmed to improve.

The pressure plate 7 is formed in a rectangular parallelepiped shape using an iron material, and is disposed on the upper surface of the heat insulator 61. At the four corners of the upper surface of the pressure plate 7, both planes (equivalent to the planes 99a and 99b according to the conventional example) of the object to be measured 19 are connected to the lower end surface 33d of the heat transfer body 33 for the heating element and the transfer for the radiator. Upper end surface 4 of heat body 42
In order to ensure close contact with each 2u, not shown, which is constituted by a coil spring for pressurizing the pressure plate 7 in the direction of the arrow F ₂ pressurization device is mounted. The pressure applied to the pressure plate 7 is set in consideration of, for example, a pressure value received when the measurement object 19 is used in an actual machine. Thus, the application of the pressing force is also effective in reducing the contact thermal resistance of each part described above.

Since the thermal conductivity measuring device 2 for a flat plate-like member according to an embodiment of the present invention shown in FIGS. 3 to 5 has the above-described configuration, most of the heat generated by the electric heating element 31 is used. Is the electric heating element 31 → the heat transfer element 33 → the lower end face 33d → the measuring object 19 → the upper end face 42u → the heat transfer element 42
The heat is released to the cooling water 49 after flowing through the path from the heat radiator 43 to the cooling water 49. Part of the heat generated by the electric heating element 31 is released to the surrounding space from the upper surface and side surfaces of the electric heating element 31 and the side surfaces of the heat transfer element 33, the measurement object 19, and the heat transfer element 42. .

However, in the thermal conductivity measuring device 2, the heat insulating layer 6
The amount of this heat released to the surrounding space is suppressed by the arrangement, and a small amount of heat is dissipated to the surrounding space. There is a heat flow for dissipated heat in the device 2. In the thermal conductivity measuring device 2, the portion through which the heat flow for dissipating heat flows is substantially limited to the vicinity of the side surfaces of the heat transfer body 33, the measurement object 19, and the heat transfer body. Therefore, the lower end surface 33d and the center portion of the upper end surface 42u where the bottomed holes 33a are formed (where the temperature detecting portions of the thermocouples 8A and 8D are attached) are affected by the heat flow for dissipating heat. Absent.

Then, the thermal conductivity measuring device 2 is provided with a heat transfer body 33 having the above-mentioned shape made of a copper material (a material having good thermal conductivity).
And a heat transfer body 42. Thus, the heat transfer body 33 equalizes the heat flow density at a portion passing through the lower end face 33d, and the heat transfer body 42 equalizes the heat flow density at a portion passing through the upper end face 42u. For these reasons, in the thermal conductivity measuring device 2, the heat flow generated by the electric heating element 31 and given to the measuring object 19 for measuring the thermal conductivity is the thermocouple 8A of the lower end face 33d and the upper end face 42u. , Thermocouple 8D
In the vicinity where the temperature detecting section is attached, the density becomes substantially uniform. Thus, in the thermal conductivity measuring apparatus 2, even if the measurement object 19 is a measurement object such as an FRP material whose local thermal conductivity value is not uniform in the plane direction, the area density of the heat flow applied to the measurement object 19 Is uniform at least in the vicinity where the thermocouples 8A and 8D are attached.

Therefore, thermocouple 8A and thermocouple 8D
Can detect the average temperatures of both planes of the measurement object 19 (equivalent to the planes 99a and 99b according to the conventional example) as t _A and t _D , respectively. The temperature detectors of the thermocouples 8A and 8D have lower ends 33d at their distal ends.
Since it is formed so as to be flush with the upper end surface 42u (see FIG. 4), even if the position where the measurement target 19 is loaded in the thermal conductivity measuring device 2 is shifted in the plane direction, the measurement target 19 is not moved. It is not affected by the detection of the temperature of both planes.

Then, in the thermal conductivity measuring device 2, the thermal conductivity λ _X of the measurement object 19 is obtained as follows. First, the measurement object 19 is applied between the lower end face 33d of the heat transfer body 33 for the heating element portion and the upper end face 42u of the heat transfer body 42 for the heat radiating section by applying grease or the like to both surfaces as necessary. Insert,
After the cooling water 49 is passed through the radiator 43, the electric heating element 31 is energized. When the temperature of each part becomes constant, such as when the outputs of the thermocouples 8A and 8D are saturated, the thermocouples 8A and 8D
Assuming that the output of 8D is the temperature value of both surfaces of the measurement object 19, the temperature values t _A and t _D are measured. The thermal conductivity λ _X of the plate-shaped measurement object 19 having the thickness d is represented by the temperature value t
_A, and t _D, the area of the measured object 19 S, electrical heating element 31
(2) based on the power P given to

[0027]

Λ _X = βP · d / {S · (t _A −t _D )} (2) where β is heat conduction with respect to electric power P applied to the electric heating element 31. It is a correction coefficient relating to the amount of heat radiation from the heat insulating layer 6 of the rate measuring device 2.

The correction coefficient β is obtained by calculating the amount of heat dissipated from the heat insulating layer 6 by an appropriate method such as calculation. That is, the thermal conductivity measuring device 2 is a flat plate-shaped measuring object 1.
Even if the material 9 uses a filler such as an FRP material, the thermal conductivity value can be obtained with high accuracy.

In the thermal conductivity measuring apparatus for a flat plate member according to the present invention, the heat transfer body for the heating element and the heat transfer body for the heat radiating section are like the heat transfer bodies 33 and 42. It is not always necessary to form a massive structure using a material having good thermal conductivity. That is, the heat transfer body for the heating element portion and the heat transfer body for the heat radiator portion are made of a material having good thermal conductivity, and the portions in contact with both surfaces of the measurement object 19 are substantially the same as the surface of the measurement object 19. It is formed so as to have a planar end surface having a shape and dimensions, and a temperature detecting unit is disposed on the planar end surface. For example, an electric heating element (such as an electric heating element 31 having the same surface shape and If the area density of the heat flow generated and given to the measurement object 19 is substantially uniform at a portion in contact with the surface of the measurement object 19, it is not always necessary to form the plate into a flat external shape having dimensions. If
The heat transfer body for the heating element and the heat transfer body for the heat radiator may have an appropriate structure.

That is, the heat transfer element for the heating element section and / or the heat transfer element for the heat radiating section encloses, for example, a refrigerant having a low boiling point, and transmits a heat flow using boiling heat transfer and condensation heat transfer. You may make it. However, when the heat transfer member 33 for the heating element portion and the heat transfer member 42 for the heat radiating portion are compared with those using the above-mentioned boiling heat transfer and condensation heat transfer, complicated processes such as vacuum evacuation processing and vacuum sealing processing are required. Since no complicated processing is required, it can be said that the object can be achieved with a relatively simple configuration.

Next, a thermal conductivity measuring apparatus for a flat member according to another embodiment of the present invention will be described with reference to FIGS. Here, FIG. 6 is a partially cutaway side view showing a thermal conductivity measuring apparatus for a plate-like member according to a different example of the embodiment of the present invention together with a measurement object and a known sample member. FIG. It is a side sectional view showing the important section of the shown intermediate attachment for temperature detection parts. In the following description, the same parts as those of the thermal conductivity measuring device and the object to be measured shown in FIGS. 3 to 5 are denoted by the same reference numerals, and the description thereof will be omitted. In the drawings used in the following description, FIG.
5 are only described as representative as possible.

In FIGS. 6 and 7, 2A corresponds to FIGS.
Is a thermal conductivity measuring device for a plate-like member in which an intermediate mounting body 5 for a temperature detecting portion is added to the thermal conductivity measuring device 2 according to the present invention shown in FIG. It is. The known sample member 18 is a plate-like member having a known thermal conductivity λ _S, has the same surface shape and dimensions as the measurement object 19, and in this case, has the same thickness as the measurement object 19. Having a thickness d of The intermediate mounting body 5 is formed in a rectangular parallelepiped shape using a copper material which is a material having good thermal conductivity, and the upper end surface 5u and the lower end surface 5d are formed in a planar shape having the same shape and dimensions. ,
The surface shape and dimensions are the same as the surface shape and dimensions of the measurement object 19.

A small-diameter bottomed hole 5a is connected to the center of the upper end surface 5u of the intermediate mounting member 5, and a small-diameter bottomed hole 5b is connected to the center of the lower end surface 5d. Thus, small-diameter bottomed holes 5c are respectively formed from the side surfaces of the intermediate mounting body 5. The positions where the bottomed holes 5 a and 5 b are formed are portions facing the bottomed holes 33 a formed in the heat transfer body 33. The bottomed holes 5a and 5c are loaded with a thermocouple 8B as a temperature detecting element, and the bottomed holes 5b and 5c are loaded with a thermocouple 8C as a temperature detecting element as shown in FIG. Note that the contents of the thermocouples 8B and 8C, the formation positions of the bottomed holes, the method of loading the intermediate mounting member 5, and the like are the same as those of the thermocouple 8A.

Thus, the intermediate mounting body 5 and the known sample member 18 are arranged such that the upper end surface 5u of the intermediate mounting body 5 is on the opposite side to the surface in contact with the heat transfer body 33 for the heating element portion of the measurement object 19. The lower end surface 5d of the intermediate mounting body 5 contacts one surface of the known sample member 18, and the known sample member 1
8 is the upper end surface 42 of the heat transfer body 42 for the heat dissipating part.
It is arranged in the thermal conductivity measuring device 2A so as to be in contact with u. In addition, between the upper end face 5u of the intermediate mounting body 5 and the measurement object 19, between the lower end face 5d of the intermediate mounting body 5 and the known sample member 18, or between the known sample member 18 and the heat transfer body 42. Grease or the like can be applied to each of the portions between 42u and 42u as needed to reduce the contact thermal resistance.

In the thermal conductivity measuring apparatus 2A for a plate-like member according to a different embodiment of the present invention shown in FIGS. 6 and 7, the above-described configuration is adopted. Many parts include the electric heating element 31 → the heat transfer element 33 → the lower end face 33 d → the measuring object 19 → the upper end face 5 u → the intermediate mounting body 5 → the lower end face 5 d → the known sample member 18 → the upper end face 42 u → the heat transfer element 42. The heat is released to the cooling water 49 after flowing through the path from the heat radiator 43 to the cooling water 49. Then, in the thermal conductivity measuring device 2A, for the same reason as in the case of the thermal conductivity measuring device 2, the measurement object 19 and the known sample
The area density of the heat flow flowing through at least the thermocouple 8
A, the thermocouple 8B, the thermocouple 8C, and the thermocouple 8D become uniform in the vicinity where the thermocouple 8D is attached.
And the known sample member 18 have the same value.

Then, in the thermal conductivity measuring device 2A, the thermal conductivity λ _X of the measuring object 19 is obtained as follows.
First, the measurement object 19 and the known sample member 18 are measured. The measurement object 19 is located between the lower end surface 33 d of the heat transfer body 33 and the upper end surface 5 u of the intermediate mounting member 5.
Numeral 8 applies grease or the like to both surfaces between the lower end surface 5d of the intermediate mounting member 5 and the upper end surface 42u of the heat transfer member 42 as necessary, and allows the cooling water 49 to flow through the radiator 43. Then, the electric heating element 31 is energized.

When the temperature of each part becomes constant, such as when the outputs of the thermocouples 8A to 8D are saturated, the thermocouples 8A and 8B
Are the temperature values on both surfaces of the measurement object 19, and the outputs of the thermocouples 8C and 8D are the temperature values on both surfaces of the known sample member 18, and the temperature values t _A , t _B , and t _{C are obtained.}
And t _D are measured. Thermal conductivity lambda _X of a flat measurement object 19, since the thickness of the measurement object 19 and the known sample member 18 is the same, this temperature value, such as t _A ~t _D
And the thermal conductivity λ _S of the known sample member 18, and is obtained by equation (3).

[0038]

Λ _X = λ _S (t _C −t _D ) / (t _A −t _B ) (3) That is, the thermal conductivity measuring device 2A is a flat-plate type measurement. Even if the target body 19 uses a filler such as an FRP material, the plate-like known sample member 1 having a known thermal conductivity λ _S is used.
8 allows the correction coefficient β to be maintained while maintaining the advantages of the thermal conductivity measuring device 2.
A new advantage is obtained that can be eliminated. In this way, when the thermal conductivity measuring device 2A is compared with the thermal conductivity measuring device 2, the number of measurement items can be reduced as compared with the case of the thermal conductivity measuring device 2, and the measurement accuracy can be further improved.

Lastly, a thermal conductivity measuring apparatus for a plate-like member according to still another embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a partially cutaway side view showing a thermal conductivity measuring apparatus for a plate-like member according to still another example of the embodiment of the present invention together with an object to be measured and a known sample member. FIG. FIG. 4 is a side cross-sectional view illustrating a main part of a mounting body for a temperature detection unit of the heat generating unit illustrated in FIG.
In the following description, the same parts as those of the thermal conductivity measuring device and the known sample member of the present invention shown in FIGS. 6 and 7 are denoted by the same reference numerals, and description thereof will be omitted. In addition, in the drawings used in the following description, only reference numerals shown in FIGS. 6 and 7 are represented as representative as possible.

In FIGS. 1 and 2, reference numeral 1 denotes a heat-generating unit 3A in place of the heat-generating unit 3A and the heat-radiating unit 4A in the thermal conductivity measuring apparatus 2A according to the present invention shown in FIGS. , A thermal conductivity measuring device for a plate-like member using the radiator 4. When the heating element 3 is compared with the heating element 3A, the heating element 3 is replaced with the heating element 33 of the heating element 3A and the heat transfer element 32 for the heating element and the temperature detection section. The only difference is the use of a mounting body 39 for the vehicle. The heat transfer body 32 extends from the heat transfer body 33 to the bottomed holes 33a and 33c.
It can be said that the mounting portion of the thermocouple 8A is removed, and since it is formed in a rectangular parallelepiped shape using a copper material and has the same surface shape and dimensions as the heat transfer body 33, avoid duplication. The description is omitted.

The mounting member 39 is formed in a rectangular parallelepiped shape using a copper material which is a material having good thermal conductivity, and its upper end surface 39u and lower end surface 39d have the same shape and dimensions and are flat. Formed and its surface shape and dimensions are measured object 1
9 are the same as those in FIG. A small-diameter bottomed hole 39a is formed in the center of the lower end surface 39d of the attachment body 39, and a small-diameter bottomed hole 39c is formed from the side surface of the attachment body 39 so as to be connected to the bottomed hole 39a. The position where the bottomed hole 39a is formed is the bottomed hole 33a formed in the heat transfer body 33.
This is exactly the same site as in the case of.

The bottomed holes 39a and 39c have thermocouples 8A.
Are loaded as shown in FIG. Note that the method of loading the thermocouple A into the mounting body 39 is exactly the same as that of the heat transfer body 33, and thus the description is omitted to avoid duplication. The structure of the mounting body 39 is quite similar to the structure of the intermediate mounting body 5 except for a bottomed hole formed in an end face for loading a thermocouple, and a bottomed hole in one end face. It is only that 39a is formed. Therefore, the intermediate mounting body 5 can be used as the mounting body 39.

When the heat dissipator 4 is compared with the heat dissipator 4A, the heat dissipator 4 is replaced by the heat dissipator 42 for the heat dissipator included in the heat dissipator 4A. The only difference is the use of the body 41 and the mounting body 49 for the temperature detecting section. It can be said that the heat transfer member 41 is obtained by removing the thermocouple 8D from the heat transfer member 42, such as a bottomed hole, but in this case, the heat transfer member 41 is used for the heat generating member. It has exactly the same structure, shape, and dimensions as the heat transfer body 32. Thus, the mounting body 49 has exactly the same structure, shape and dimensions as the mounting body 39, and is different from the mounting body 39 in that it is used upside down, and the thermocouple to be loaded is a thermocouple 8D. There is only one thing.

Then, the attachments 39 and 49 are attached to the attachment 3
9 is in contact with the lower end surface of the heat-generating body heat conductor 32, and the lower end surface 39d of the mounting body 39 is
And the upper end surface of the mounting body 49 is in contact with the lower surface of the known sample member 18, and the lower end surface of the mounting body 49 is in contact with the upper end surface of the heat transfer body 41. Will be arranged. The lower end face of the heat transfer body 32, the upper end face 39u and the lower end face 39d of the mounting body 39, the upper and lower end faces of the mounting body 49, and the upper end face of the heat transfer body 41 are all smooth surfaces. However, between the lower end face of the heat transfer body 32 and the upper end face 39u of the mounting body 39,
In order to reduce the contact thermal resistance between the lower end surface of the mounting body 49 and the upper end surface of the heat transfer member 41, these joints are coated with grease or a soft metal (for example, indium).
It is preferable to insert a foil or the like.

The thermal conductivity measuring apparatus 1 for a flat plate member according to a further different embodiment of the present invention shown in FIGS. 1 and 2 has the above-described configuration. Many parts of the electric heating element 31 → heat transfer element 32
→ mounting body 39 → lower end face 39 d → measuring object 19 → intermediate mounting body 5 → known sample member 18 → upper end face (end face 39
(same as d) → the mounting body 49 → the heat transfer body 41 → the radiator 43 → the cooling water 49 and then discharged to the cooling water 49. The path of the heat flow in the thermal conductivity measuring device 1 is basically the same as in the case of the thermal conductivity measuring device 2A described above.
Since the thermal conductivity λ _X of the plate-shaped measurement object 19 in the case of the thermal conductivity measuring device 1 can be obtained by using the above equation (3) in the same manner as in the case of the thermal conductivity measuring device 2A, the overlap is obtained. And its explanation is omitted.

Thus, the thermal conductivity measuring device 1 maintains the advantages of the thermal conductivity measuring device 2A,
By mounting the thermocouples 8A, 8D from the heat transfer bodies 33, 42 in the case of the thermal conductivity measuring device 2A to the thinner and lighter mounting bodies 39, 49, the thermocouples 8A, 8D can be mounted. 8D
Can be easily attached to the bottomed hole. That is, the thermal conductivity measuring device 1 can reduce the manufacturing cost related to the mounting work of the thermocouples 8A and 8D as compared with the case of the thermal conductivity measuring devices 2 and 2A.

In the above description, the known sample member 18 is related to the heat flow generated by the electric heating element 31 and the object 19 to be measured.
Is arranged downstream, but is not limited to this, and may be arranged upstream of the measurement object 19. Further, in the above description, the thickness of the known sample member 18 has been described as being the same as the thickness d of the measurement object 19; however, the present invention is not limited to this. There is no problem even if it is different from the thickness d of 19. However, it is necessary to review equation (3) in response to this.

[0048]

According to the thermal conductivity measuring apparatus for a flat member according to the present invention, the following effects can be obtained by adopting the structure described in the section of the means for solving the above problems. By adopting the configuration according to the first or second mode of the invention, the object to be measured, the temperature detector for the heating element, and the temperature detector for the heat radiator The area density of the heat flow passing through can be the same. Further, even if the position at which the object to be measured is loaded into the thermal conductivity measuring device shifts in the plane direction, the temperature difference occurring in the thickness direction of the object to be measured does not substantially change. Due to these facts, even if the local thermal conductivity value is non-uniform in the plane direction, it is possible to measure the temperature difference occurring in the thickness direction of the target object with high accuracy, and the flat plate-shaped member can be measured. Can be measured with high accuracy. Also,

By adopting the configuration according to the third aspect of the present invention, the surface shape and dimensions of the object to be measured, the heating element, and the heating element for the heating element portion are all substantially the same. It is possible to simplify the structure of the heat transfer body for the heating element portion, and it is possible to reduce the manufacturing cost of the thermal conductivity measurement device for the flat plate member while maintaining the effect according to the above item. Become. Still further, by adopting the configuration according to the mode (4) of the means for solving the above problems, the area density of the heat flow flowing through the respective central portions of the measurement object and the known sample member is made equal. Since it is not necessary to consider the correction coefficient regarding the amount of heat radiation from the heat insulating layer, the measurement accuracy of the thermal conductivity of the flat member can be further improved.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view showing a thermal conductivity measuring apparatus for a plate-like member according to still another example of the embodiment of the present invention together with a measurement object and a known sample member.

FIG. 2 is a side sectional view showing a main part of a mounting body for a temperature detecting unit of the heating unit shown in FIG. 1;

FIG. 3 is a partially cutaway side view showing a thermal conductivity measuring apparatus for a plate-like member according to an embodiment of the present invention together with an object to be measured.

FIG. 4 is a cross-sectional view of a portion Q in FIG. 3 of the heat transfer member for the heat generating portion shown in FIG. 3;

FIG. 5 is a view showing a main part of the heat radiator shown in FIG. 3;
Is a top view, and (b) is a side view of FIG.

FIG. 6 is a partially cutaway side view showing a thermal conductivity measuring apparatus for a plate-like member according to a different example of the embodiment of the present invention together with a measurement object and a known sample member.

FIG. 7 is a side sectional view showing a main part of the intermediate mounting body for the temperature detection unit shown in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a main part of a conventional thermal conductivity measuring device for a plate-like member together with an object to be measured.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal conductivity measuring device 18 Known sample member 19 Measurement object 3 Heating element part 31 Electric heating element 32 Heat transfer body 39 Mounting body 4 Heat radiating part 41 Heat transfer body 43 Heat radiating body 49 Mounting body 5 Intermediate mounting body 6 Heat insulation layer 61 Insulator 62 Insulator 7 Press plate 8A Thermocouple 8B Thermocouple 8C Thermocouple 8D Thermocouple

Claims (4)

[Claims] 1. An electric heating element, having a planar end face, applying heat generated by the electric heating element to the object to be measured from the planar end face, and detecting a temperature for the heating element portion on the planar end face side. Heating element having a heat conductor for a heating element made of a heat conductive material, and a heat radiator, and a heating element configured to transfer heat generated by the electric heating element via a measurement object. And received by a flat end face having substantially the same surface shape and dimensions as the flat end face of the heat transfer element, and transferred to the heat dissipating body. A radiator having a heat conductor for the radiator made of a thermally conductive material having a temperature detector for the radiator disposed on the side of the radiator, a radiator for the radiator, a measuring object and A heat insulating layer disposed around the heating element, wherein the heating element has a flat plate shape between the planar end faces of the heating element and the radiator; The measurement object having substantially the same surface shape and dimensions as the planar end face of the heat transfer body is interposed, and each of the flat surfaces on both sides of the measurement object is a planar end face of a heating element portion and a heat radiating portion. A thermal conductivity measuring device, which is closely adhered to. 2. The thermal conductivity measuring device according to claim 1, wherein the heating element and / or the radiator include a temperature detector for the heat generator and a temperature detector for the radiator. A mounting body for the temperature detecting unit for mounting is provided on the measurement object side, and this mounting body is made of a heat conductive material and has substantially the same surface shape as the planar end surface of the heat transfer body for the heating element section on the measurement object side. A thermal conductivity measuring device characterized by having dimensions. 3. The thermal conductivity measuring device according to claim 1, wherein the electric heating element generates heat within a range of surface shape and dimensions substantially equal to a planar end face of the heat transfer element for the heating element portion. The heat transfer element for the heating element portion is formed in a flat shape having an end surface in contact with an electric heating element having substantially the same surface shape and dimensions as the flat end surface on the measurement object side. A thermal conductivity measuring device, characterized in that: 4. The thermal conductivity measuring device according to claim 1, wherein heat is generated between the heating element and the object to be measured or between the object to be measured and the radiator. A known sample member including an intermediate mounting body for the temperature detection unit in which the temperature detection unit is disposed at a position substantially opposite to the temperature detection unit for the body, and a known sample member made of a material having a known thermal conductivity; The member is formed in the shape of a flat plate having substantially the same surface shape and dimensions as the object to be measured, and the intermediate mounting body has the same surface shape and dimensions as the planar end face of the heat transfer element for the heating element on the object to be measured side. A thermal conductivity measuring device, wherein the thermal conductivity measuring device is formed in a flat plate shape and disposed in contact with an object to be measured.