JPS5824845A - Heat insulating device - Google Patents

Abstract

PURPOSE:To obtain high-precise and reliable data, by a method wherein a temperature measuring resistor is mounted to one of two flat plates by which the temperature measuring resistor is positioned between the nip formed, a heating substance is installed to the other, and the heating amount of the heating substance is controlled so that temperatures at the sides of the two temperature-measuring resistors coincide with each other. CONSTITUTION:If temperature at a temperature measuring resistance (1) side rises higher than that of a temperature measuring resistor (5) side, the electric resistance of the resistor 1 becomes higher than that of the resistor 5, a bridge circuit, consisting of the resistors 1, 5 and constant-resistors 8, 9, is brought to an unbalancing state, and a potential at a point A becomes higher than a potential at a point B. As a result, potential difference signals at the points A and B are inputted to a DC amplifier 10, an output current of a power amplifier 11 flows to a heating metal resistance wire 6, the temperature at the resistor (5) side rises, and the temperature at the resistor (1) side becomes gradually equal to that of the resistor (5) side. As stated above, a temperature difference between both sides of a flat plate or of a sheet made of an electric insulating material is detected, and this prevents the production of the temperature difference.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used for the wall of a calorie-making room where performance tests of air conditioners and thermal property tests of building materials are carried out. This relates to heat insulating devices such as flannel.

Conventional devices of this type use heat insulating materials with low thermal conductivity to suppress heat transfer as much as possible, but when there is a temperature difference between the air and the insulating material, it is inevitable that some amount of heat will flow. Therefore, when this heat insulating material is used on the wall surface of the calorimeter chamber, there is a drawback that heat passing through the wall surface causes errors in heat measurement.

The present invention eliminates such conventional drawbacks, and heats or heats and cools one side of a flat plate member so that the temperatures of both surfaces of the flat plate member match, and as a result, the amount of heat passing through the flat plate member is reduced to zero. It is designed to be used on the wall of a calorimeter room for measuring thermal constants such as thermal conductivity or for testing the performance of air conditioners. The purpose is to obtain accurate data.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is an external view showing one embodiment of the heat insulating device of the present invention;
The figure is also a sectional view. In the figure, I is a resistance temperature sensor, 2, 3. 4 is an interface, 5 is a temperature sensing resistor sealed to the interface 4, and 6 is a flat plate member or sheet. This is a heating metal resistance wire printed on No. 3. Figure 3 is a circuit diagram of the same control device, where 7 is a constant voltage circuit, 8 and 9 are constant resistors that together with the temperature sensing resistor 1°5 constitute a bridge circuit, and 10 is an unbalanced voltage of the bridge circuit. DC amplifier, 11
1 is a power amplifier that converts the output voltage of this DC amplifier 10 into electric power to drive the heating metal resistance wire 6, and 12 is a rectifier element.

Next, its operation will be explained.

In FIG. 2, the temperature on the resistance temperature detector 1 side is
When the temperature on the side becomes higher, the electrical resistance of the resistance temperature detector 1 becomes thicker than that of the resistance temperature detector 5, and from the resistance temperature detector 1.5 and the constant resistance elements 8 and 9 in FIG. The bridge circuit becomes unbalanced, and the potential at point A becomes higher than the potential at point B. Therefore, the potential difference signal between points A and B is input to the DC amplifier 10, the output current of the power amplifier 11 flows to the heating metal resistance wire 6, and the temperature on the resistance temperature detector 5 side in FIG. 2 rises. Temperature on resistance temperature detector 1 side and resistance temperature detector 5
The temperature on the side approaches.

Conversely, when the temperature on the resistance temperature sensing element 5 side becomes higher than the temperature on the resistance temperature sensing element 1 side, the resistance value of the resistance temperature sensing element 5 becomes larger than the resistance value of the resistance temperature sensing element 1 in FIG. In this case, if there is no rectifying element 12, the potential at point B will be higher than the potential at point A, a current will flow through the heating metal resistance wire 6, and the temperature difference between the resistance temperature detectors 1 and 5 will become even larger. , the potentials at points A and B are equal due to the connection of the rectifying element 12, and the DC amplifier 1
If the input to 0 is zero, no heating operation is performed. Note that this embodiment is effective when the resistance temperature detector 5 side is naturally cooled or at a low temperature.It is also obvious that the temperatures on the two resistance temperature detector sides can be matched by using a SIRISK instead of a bridge circuit. It is.

FIG. 4 is a sectional view showing a second embodiment of the heat insulating device of the present invention. That is, in the case of the first embodiment, if the temperature on the resistance temperature detector 5 side is higher than the temperature on the resistance temperature detector 1 side and cannot be lowered even by natural cooling, the insulation properties deteriorate.

Therefore, in order to avoid this, cold air is made to flow toward the heating metal resistance wire 6 side shown in FIG. 16 has been added.

By constantly cooling the heating metal resistor @6 side in this way, even when the temperature on the resistance temperature detector 5 side is higher than that on the resistance temperature detector 1 side, the insulation properties do not deteriorate. Temperature resistor 5
When the temperature on the side is lower than that on the resistance temperature detector 1 side, heating of the metal resistance wire 6 for heating is controlled in the same manner as in the first embodiment.

FIG. 5 is a sectional view showing a third embodiment of the heat insulating device of the present invention, and FIG. 6 is a circuit diagram showing a control device thereof. In addition,
The same parts as in FIGS. 2 and 3 are given the same reference numerals. That is, as shown in the figure, a metal plate 18 with good thermal conductivity is bonded (5) to an electrical insulating sheet 17, and an electronic refrigeration element 19 is further bonded to the opposite side of the metal plate 180.The circuit diagram is shown in FIG. Except for the rectifying element, an electronic refrigeration element 19 is attached in place of the heating metal resistance wire 6 in the second embodiment (see FIG. 2).

The operation is such that when the temperature on the resistance temperature detector 1 side is higher than the temperature on the resistance temperature detector 5 side, the potential at point A of the bridge circuit is higher than the potential at point B, and therefore the direction of arrow 20 A current flows, and the υ metal plate 18 (see FIG. 5) is cooled by the electronic refrigeration element 19. Conversely, the temperature on the resistance temperature detector 5 side is the temperature on the resistance temperature detector 1 side.
When the temperature at the side is higher than that at the point A, the electric potential at point A is higher than the electric potential at point B, and a current flows in the direction of the arrow 21, the electronic refrigeration element 19 acts as a heat pump, and the metal plate 18 is heated.

By such an operation, the direction and value of the current flowing through the electronic refrigeration element 19 are controlled so that the temperatures on the sides of the resistance temperature detectors 1 and 5 are always equal, and as a result, insulation can be ensured.

As explained in detail above, the present invention provides electrical insulation (c
) It is configured to detect the temperature difference on both sides of a flat plate or sheet of material and heat or heat/cool it so that the temperature difference disappears, so if it is used as the dead surface of a calorie box, for example, the amount of heat passing through the wall surface will be reduced. This has the effect of making heat accounting easier.

By using metal printing technology, the thickness of the entire device can be made mathematically thinner by printing the temperature-measuring resistor on a plastic plate with a thickness of about 1 mm or a plastic sheet.

[Brief explanation of the drawing]

Fig. 1 is an external view showing one embodiment of the heat insulating device of the present invention;
3 is a circuit diagram of the same control device, FIG. 4 is a sectional view showing a second embodiment of the heat insulating device of the present invention, and FIG. 5 is a sectional view showing the third embodiment. Sectional view, No. 6
The figure is a circuit diagram of the control device in FIG. 5. DESCRIPTION OF SYMBOLS 1... Resistance detector, 2, 3... Flat plate member or sheet, 4... Interface, 5... Resistance temperature detector, 6... Metal resistance wire for heating, 7... Constant Voltage circuit, 8, 9... Constant resistor, 10... DC amplifier, 11... Power amplifier,
12... Rectifying element, 13... Insulating layer, 14... Heat sink, 15... Cooling water, 16... Cooling panel, 1
7... Electric insulation sheet I., 18... Metal plate, 19.
...electronic refrigeration element. Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] (1) Of the two outer surfaces of two flat plates or two sheets with a resistance temperature detector sandwiched between them, the resistance temperature detector is provided on one side and the heating element is provided on the other. , a device consisting of a control device that controls the amount of heat generated by the heating element so that the temperatures on the sides of the two resistance temperature detectors match (2) two flat plates or two plates with the resistance temperature detector sandwiched between them; A resistance temperature detector is provided on one of the two outer surfaces of the sheet, and a heating element is provided on the other, and a cooling element is placed in close contact with the two outer surfaces of the sheet. A heat insulating device consisting of a control device that controls the amount of cooling of the cooling body. (3) Of the two outer surfaces of two flat plates or two sheets with a resistance thermometer sandwiched between them, the resistance thermometer is closely attached to one and a metal plate with excellent thermal conductivity is attached to the other. , and further includes an electronic refrigeration element bonded to the surface of the electronic refrigeration element, and a control device that controls the current of the electronic refrigeration element and the direction of the current so that the temperatures on the two resistance temperature detector sides match. .