JPS5831415Y2 - Constant temperature bath - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a constant temperature bath for keeping standard batteries and the like at a predetermined temperature.

In conventional thermostatic chambers, the resistance temperature detector and heater that detect temperature are placed inside the chamber, but other temperature control parts such as bridge resistors and amplifiers are placed outside the chamber where temperature control is not performed. It had been.

For this reason, there is a problem in that these parts are affected by self-heating, changes in ambient temperature, etc., and errors occur, making it impossible to control the temperature with high accuracy.

The present invention has been developed in view of this point, and attempts to eliminate the above-mentioned drawbacks by providing an inner lid inside the tank, and installing a temperature control unit inside the lid and placing it inside the tank. It is something to do.

The following will be explained based on examples.

FIG. 1 is a structural explanatory diagram showing one embodiment of the present invention, and a longitudinal cross-sectional view is shown.

FIG. 2 is an electrical connection diagram of the temperature control section.

In Figures 1 and 2, 1 is a tank, 2 is its lid, and 3
4 is a heater, 4 is a temperature detection section, 5 is an inner lid, and 6 is a temperature control section.

The tank 1 is a container for storing constant-temperature products such as standard batteries, and its walls include an inner wall 11 made of a good thermal conductor and an outer wall 12 made of a heat insulating material.
It has a dual structure with

The lid 2 is for closing the opening of the tank 1, and this wall also has a double structure of an inner wall 21 made of a good thermal conductor and an outer wall 22 made of a heat insulating material.

The heater 3 is a heat source for heating the inside of the tank, and the heater 3 is a heat source for heating the inside of the tank.
1 and the outer wall 12.

The temperature detection section 4 is for detecting temperature changes within the tank, and is composed of a temperature measuring resistor made of platinum or the like.

This detection unit 4 is attached between the inner wall 11 of the tank 1 and the heater 3.

The inner lid 5 is for installing the temperature control unit 6 in a temperature-controlled tank, and is made of a good thermal conductor such as an aluminum alloy.

This inner lid 5 is detachably attached to the tank 1 and closes the opening of the tank 1.

The temperature control section 6 is for controlling the current to the heater 3 based on the temperature change in the tank detected by the detection section 4, and is composed of a temperature measurement bridge 7, a differential amplifier 8, and a power amplifier 9. .

The temperature measurement bridge 7 includes resistors R1, R2, R3 and the detection section 4.
It is composed of a resistance temperature sensor Rt incorporated in the temperature sensing resistor Rt.

Terminals C and D of the temperature measuring bridge 7 are connected to a DC power supply E.

The other terminals P and Q are connected to the input terminal of the differential amplifier 8.

Temperature setting is performed by changing the value of resistor R3.

Terminal P of temperature measuring bridge 7! Pressure Vp(i,=) When the temperature applied to the temperature sensing resistor R5 increases, its resistance value changes, so it changes with the temperature.

In addition, the voltage of terminal Q Q is the voltage of constant voltage source E, which is connected to resistor R2.
, R3, so it becomes a constant value determined by the resistor R3.

Therefore, the output of the temperature measuring bridge 7 is the voltage Vp corresponding to the temperature and the reference voltage ■ corresponding to the set temperature.

The difference is applied as an output to the differential amplifier 8.The 4° differential amplifier 8 amplifies the minuscule output voltage of + or 1 sign from the temperature measuring bridge 7 and converts it into a power amplifier. 9. It is designed to be applied to

The power amplifier 9 is used to control the heater 3 based on the output of the differential amplifier 8. When a voltage of 10 is applied to the input terminal, the output current is increased, and the voltage of -, When an impression is made, the 1st output current is reduced.

The heater 3 generates heat based on the output of the power amplifier 9, and
It is designed to heat the inside.

The humidity and temperature controller of the present invention configured as described above operates as follows.

Now, if the temperature of the bath 1 gradually changes from the normally set temperature and, for example, falls below the set temperature, the temperature of the temperature sensing resistor and the body Rt will drop, so the voltage at the terminal P will be V.
p'<j: Along with this, it decreases by 75f.

When the voltage (2) becomes lower than the reference voltage Va, the output voltage is inverted and becomes +1 (1,000), so the output of the differential amplifier 8ρ becomes 10.

For this reason, the power amplifier 9 increases the output current, and a large current is passed through the heater 3G to boost the inside of the tank.

Then, when the temperature of the tank 1 becomes higher than the set temperature, the temperature of the resistance temperature detector Rt also rises and the voltage 2 of the terminal P becomes the reference voltage V.

Since it becomes higher than , the output voltage becomes -.

Therefore, the power amplifier 9 reduces the output current and the heater 3
Since no current flows through the tank, the temperature of the hot water in the tank gradually begins to drop.

In this way, the hot water temperature control section 6 operates so that the temperature inside the tank is always added to the set temperature and maintained at a predetermined temperature.

At this time, the temperature inside the inner lid 5 is also gently controlled and maintained at the set temperature, so that the influence of temperature changes in the control section 6 is extremely small, so that the temperature can be controlled with high precision.

In addition, changes in temperature, inspections, etc. can be carried out simply by removing the lid 2, and can be carried out without causing any disturbance inside the tank.

In the above embodiment, the temperature control unit 6 is attached to the inner lid 5 via a support, but the present invention is not limited to this.
Of course, it may also be installed directly on the.

Further, although the embodiment shows a space O between the lid 2 and the inner lid 5, this space may be filled with a heat insulating material.

In this way, the disturbance during adjustment can be further reduced.

Further, in the embodiment, temperature control is performed only by the heater 3, but the heater 3 and a cooling pipe may be arranged for control.

In this way, temperature control can be performed with higher precision.

, ・ , . As is clear from the above description, the constant temperature bath of the present invention is configured such that an inner lid is provided inside the bath, a temperature control section is attached therein, and the thermostatic chamber is placed inside the bath.

Therefore, not only can you minimize the effects of temperature changes by using your own constant temperature chamber without having to destroy the temperature control section or the constant temperature chamber used for the purpose, but it also makes it easier to perform tasks such as changing or inspecting the set temperature. This is carried out at 1/2 with almost no disturbance to the , Kega Tei: Enjoy.

. Furthermore, if the inner lid is made of metal, it is possible to perform electrostatic rolling, etc., so noise from the control circuit can be reduced, making it ideal as a constant temperature bath for measuring instruments, etc. It has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing an embodiment of the present invention, and a vertical cross-sectional view is shown. FIG. 2 is an electrical connection diagram of the temperature control section. , ・１・・・・・・tank, １１・・・・・・
Inner wall, 12... Outer wall, 2... Lid, 21
...Inner wall, 22...Outer wall, 3...
・・Heater, 4・j:, ・・Temperature detection section, 5・・・・・・
... Inner lid, 6 ... Temperature control section, 7.・・・・・・
Temperature 7゛noji, 8...Differential amplifier, 9...
・・・：Increase in military power, increase in strength.

Claims (1)

[Scope of claim for utility model registration] An outer wall made of heat insulating material, an inner wall made of metal, a heater that applies heat to this inner wall, a temperature detection unit that detects the temperature of the tank, and a signal from this temperature detection unit A constant temperature bath consisting of a temperature control section that controls the temperature inside the bath to be constant based on the above, and is surrounded by the inner wall, is placed at the opening of the bath, and is thermally coupled to the inner wall. The temperature controller is further provided with an inner lid that forms an isolated space surrounded by the inner wall, and the temperature control section is disposed in the space formed by the inner wall and the inner wall. A constant temperature bath.