JPH0259805A - Temperature controller - Google Patents

Abstract

PURPOSE:To set a temperature with high accuracy to each desired level and with high stability to the secular change by using plural types of superconductive materials to detect the temperatures for the temperature control. CONSTITUTION:The superconductive materials 1 - 4 have their electric resistances, i.e., superconductive states set at zero at temperatures T1 - T4 respectively. A temperature detecting circuit 5 decides the temperature situations according to whether the electric resistances of the materials 1 - 4 are equal to zero or not. At the same time, the electric resistances of material 1 - 4 are set at zero at temperatures T1 - T4 (T1<T2<T3<T4) respectively. In case the temperature set at a comparator 6 is equal to T2, for example, and the inside temperature of a box, etc., is dropped down to T2, the electric resistances of the materials 1 and 2 are equal to zero. The circuit 5 detects this state and transmits it to the comparator 6. The comparator 6 detects the coincidence between the set temperature and the inside temperature of the box at T2 and outputs this detecting result to an output terminal 7. Thus the operation of a compressor is stopped. Thus it is possible to set a working temperature with high accuracy and with high stability to the secular change.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device used in refrigerators and the like.

Conventional technology In recent years, with the diversification of needs, accurate temperature control has become possible.
There is a need for a temperature control device that is stable over time.

Hereinafter, a conventional temperature control device will be described with reference to the drawings. FIG. 2 is a block diagram of a compression type refrigerator, and FIG. 3 is a block diagram of a conventional temperature control device using a thermostand, which corresponds to the temperature control device 20 of the compression type refrigerator shown in FIG.

In FIG. 2, 20 is a temperature control device, 21 is a compressor,
22 is a condenser, 23 is a pressure reducer, and 24 is an evaporator. In Fig. 3, 25 is a knob, 26 is a cam, 27 is an adjustment spring, 28 is an arm a, 29 is a contact a, 30 is a contact b, 3
I is arm b, 32 is diaphragm, 33 is raging tube, 3
4 is the fulcrum a.

35 is a fulcrum b, and 36 is a case. The operation will be explained below.

In the compression refrigerator shown in FIG. 2, the refrigerant is supplied to a compressor 21, a condenser 22. Pressure reducer 23. It circulates through the evaporator 24 and develops a cooling function by transferring heat that changes between gas and liquid. A low-temperature, low-pressure gaseous refrigerant is added to the compressor 20 from the blower 24 . The compressor 20 compresses this refrigerant into a high-temperature, high-pressure gaseous refrigerant, which is then added to the condenser 22 . The condenser 22 exchanges heat with room-temperature cooling water or air, and supplies the high-temperature, high-pressure gas refrigerant to the pressure reducer 23 as a room-temperature, high-pressure liquid refrigerant.

The pressure reducer 23 converts the normal temperature, high pressure liquid refrigerant into a low temperature, low pressure liquid refrigerant whose pressure has been lowered to a state where it can easily evaporate, before sending it to the evaporator 24 . In the evaporator 24, this low-temperature, low-pressure liquid refrigerant evaporates while removing the heat necessary for evaporation from the surrounding air. It is possible to cool the inside of the refrigerator or the room. At this time, the temperature control device 20 keeps the temperature inside the refrigerator or the room constant, and detects the temperature inside the refrigerator or the room.If the temperature inside the refrigerator or the room is higher than the set temperature, the compressor 21 is operated. It functions to cool the inside or the room, and when the set temperature is reached, the pressurizer 21 is stopped to keep the inside or the room at a constant temperature. Fig. 3 shows a conventional thermostat-based temperature control device used in the temperature control device 2+. The temperature of the enclosed refrigerant gas also decreases, and the pressure inside the diaphragm 32 decreases, so the diaphragm 32 contracts and the arm a28 moves about the fulcrum a34, separating the contacts a29 and b30.
FF. When the temperature inside the refrigerator or the room rises again, the temperature of the refrigerant gas sealed in the diaphragm 32 rises due to the heat-sensitive tube 33, the pressure inside the diaphragm 32 rises, and the expansion of the diaphragm 32 causes the arm a28 to move to the fulcrum a34. It moves with the fulcrum as a fulcrum, and the contact a29 and the contact b30
Touch it to turn it ON. ON of contact a29 and contact b30
, the OFF point changes depending on the strength of the adjustment spring 27. Further, the strength of the adjustment spring 27 is determined by the cam 26 that moves by turning the knob 25, so that the arm b31 is moved to the fulcrum b35.
It can be changed by moving using the fulcrum as a fulcrum. Therefore, the position of the knob 25 is determined according to the set temperature, and the contact a29 is
By controlling the compressor shown in Fig. 2 by turning on and off contact b30, the temperature inside the refrigerator or room can be kept constant (for example, "Product Service Technology Expanded Edition Jpp129-pp166゜Nippon Broadcasting Publishing association).

Problems to be Solved by the Invention However, in the above configuration, since the control is performed mechanically, there may be variations in the operating temperature depending on the position of the knob 25,
There have been problems in that operating temperature changes occur due to aging of the adjustment spring 27, and furthermore, it may be mechanically damaged.

In view of the above-mentioned problems, the present invention provides a temperature control device that is accurate to a desired temperature setting value and is stable against changes over time.

Means for Solving the Problems In order to solve the above problems, the temperature control device of the present invention has a configuration in which a plurality of conductive materials are used for temperature detection on the temperature side '41.

Effect The present invention uses the above-mentioned configuration to detect temperature based on the temperature determined by the superconducting material at which the electrical resistance of the superconducting material becomes zero. Therefore, the operating temperature can be set more accurately using the superconducting material, and it is stable against aging. Temperature detection is possible.

EXAMPLE Hereinafter, a temperature control device according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a temperature control device according to an embodiment of the present invention, and corresponds to the temperature control device 20 of a compression refrigerator shown in FIG. 1 to 4 are respectively temperatures T1 to
5 is a temperature detection circuit that determines the temperature situation depending on whether the electrical resistance of superconducting materials 1 to 4 is zero, and 6 is a setting. This is a comparison circuit that compares the temperature with the temperature detected by the temperature detection circuit 5, and the comparison result is outputted from the output terminal 7 to control the compressor 21 in FIG.

The temperature control device configured as above will be explained. In FIG. 1, superconducting materials 1 to 4 are heated at a temperature T
, ~T, (T,<T2<T3<T,), the electrical resistance becomes zero. Number of superconducting materials 1 to 4 and temperature T1 to
T4 is a value selected depending on the desired temperature range and temperature step.

Now, for the sake of simplicity, there are four superconducting materials 1 to 4, and the temperature at which the electrical resistance of each becomes zero is T1 to T□, but the temperature range you want to set is Ta to T, and this range is n If you want to control in steps, T,,T,,T2...
...T-+, Tb (Ta <T, <T2<・
It is sufficient to use n+1 superconducting materials whose electrical resistance becomes zero at a temperature of T7-I<T. The superconducting materials 1 to 4 are installed in a refrigerator or room where temperature control is desired. When the temperature set in the comparator circuit 6 is T2, when the temperature inside the refrigerator or room decreases and reaches T2, the electrical resistance becomes zero in addition to the superconducting material 1 and the superconducting material 2. The temperature detection circuit 5 detects this state. Then, it informs the comparator circuit 6 that the temperature inside the refrigerator or room has reached T2. The comparison circuit 6 detects that the set temperature and the temperature inside the refrigerator or the room match at T2, and outputs the result to the output terminal 7. By this output, the operation of the compressor 21 shown in FIG. 2 is stopped, and the temperature inside the refrigerator or room is maintained at T2. Then, when the temperature inside the refrigerator or room increases and only the superconducting material 1 has an electrical resistance of zero, and the resistance of the superconducting material 2 is no longer zero, this state is detected by the temperature detection circuit 5, and the comparison circuit 6 As a result, it is detected that the temperature inside the refrigerator or the room is higher than T2, and the result is outputted to the output terminal 7. With this output, the operation of the compressor 21 shown in FIG. 2 is started, and the temperature inside the refrigerator or the room can be kept constant by repeating 0 or more times to lower the temperature inside the refrigerator or the room to T2.

As described above, according to the zero example, superconducting materials 1 to 4 whose electrical resistance becomes zero at temperatures T1 to T, respectively, are used, and the temperature detection circuit 5 detects the temperature inside the refrigerator or room from the electrical resistance. The comparison circuit 6 obtains the comparison result with the set temperature at the output terminal 7, controls the compressor 21, and controls the temperature to set the temperature T1 at which the electrical resistance of the superconducting materials 1 to 4 becomes zero. Accurate temperature control corresponding to T4 is possible, and the values T1 to T4 unique to superconducting materials 1 to 4 are stable over time.

Effects of the Invention As described above, the present invention uses a plurality of superconducting materials for temperature detection for temperature control, thereby realizing a temperature control device with accurate operating temperature and stable over time. .

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a temperature control device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a compression refrigerator, and FIG. 3 is a configuration diagram of a temperature control device using a conventional thermostand. 1 to 4...Superconducting material, 5...Temperature detection circuit, 6...Comparison circuit, 7...Output terminal, 2o... Temperature control device, 21...
・Compressor, 22・Old...Condenser, 23...Reducer, 24...Evaporator, 25...Knob, 26...Cam, 27...adjustment spring,
28...Arm a, 29...Contact a,
30・Old...Contact b, 31...Arm b, 32
...Diaphragm, 33 ... Anger tube,
34...Fulcrum a, 35.Old...Fulcrum b, 36.
·····Case. Name of agent: Patent attorney Shigetaka Awano (Figure 8)

Claims (1)

[Claims] A temperature control device characterized by using a plurality of superconducting materials for temperature detection for temperature control.