JPH04299973A - Method for controlling culture device - Google Patents

Abstract

PURPOSE:To efficiently and highly precisely control the inner temperature of a culture chamber by detecting the temperature of the culture chamber insulated with a jacket, and supplying warm water into the jacket from a temperature- controlled warm water tank, only when the detected temperature is deviated from a prescribed value. CONSTITUTION:The inner temperature of a culture tank 1 insulated with a jacket is detected by a temperature detector 4. Only when the detected temperature is deviated from a preliminarily set temperature range, warm water is supplied into a jacket from a warm water tank 6 having a controlled temperature to control the culture chamber 1 to a prescribed temperature. The temperature of the warm water chamber 6 is controlled e.g. with a heater 7, a cooling water valve 8 and a temperature controller. The temperature of a culture tank 1 is controlled by adjusting the opening degree of an automatic three-way valve 3 by the control of the PID output of a culture chamber temperature controller 5 to control the volume of warm water fed from a circulation pump 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling temperature in a culture apparatus.

0002

[Prior Art] Regarding conventional temperature control methods for culture tanks, etc., please refer to the document “Electrical Engineering Handbook No. 15 published by the Institute of Electrical Engineers of Japan”.
70 (1978 edition), the heater and cooling water valves can be turned on in response to temperature changes in the culture tank.
-OFF control was being performed. Note that related devices of this type include, for example, Japanese Patent Application Laid-open No. 80496/1983.

0003

[Problem to be Solved by the Invention] In the above conventional technology, automatic valves for heaters and cooling water are turned on due to temperature changes in the culture tank.
-OFF control is performed to control the hot water temperature inside the jacket, so there is a large temperature change inside the jacket, and insufficient consideration has been given to the controllability of the set temperature.

An object of the present invention is to provide a method for controlling the temperature inside a culture tank efficiently and with high precision.

[0005]

[Means for solving the problem] In order to achieve the above object, a hot water tank, a hot water circulation pump, a heater as a heating source, a cooling water automatic valve as a cooling source, a temperature detector, and a temperature controller are installed in the hot water tank. In addition, a temperature detector and temperature controller in the culture tank,
An automatic control valve and connecting piping are installed at the outlet of the hot water circulation pump.
The temperature and flow rate of hot water flowing into the culture tank jacket are controlled by the deviation of the culture tank temperature controller, allowing highly accurate temperature control.

[0006] Furthermore, the setting of the hot water tank temperature controller is changed depending on the temperature of the culture tank, so that more accurate temperature control can be performed.

[0007]

[Function] The temperature in the hot water tank is controlled by the heater and automatic cooling water valve using a hot water tank temperature controller, and the temperature in the culture tank is continuously controlled by PID control of the automatic control valve by the culture tank temperature controller. and performs high-precision temperature control.

[0008] Further, by increasing or decreasing the temperature set value in the hot water tank depending on the tendency of increase or decrease in temperature in the culture tank, more accurate temperature control is performed.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an embodiment showing the overall configuration of temperature control. In FIG. 1, 1 is a culture tank having a hot water jacket, 2 is a circulation pump that feeds hot water into the culture tank 1, and 3 is a culture tank having a hot water jacket.
is a three-way automatic control valve that adjusts the amount of hot water; 4 is a temperature detector in the culture tank; and 5 is a temperature controller for the culture tank. 6 is a hot water tank for storing hot water, 7 is a heating heater, 8 is a cooling water valve for supplying cooling water, 9 is a temperature detector in the hot water tank, and 10 is a hot water tank temperature controller.

In the above configuration, hot water stored in the hot water tank 6 is sent to the culture tank 1 by the circulation pump 2 and used for circulation. The temperature of the hot water in the hot water tank 6 is controlled by a heater 7, a cooling water valve 8, and a hot water tank temperature controller 10. The internal temperature of the culture tank 1, which is the purpose of control, is controlled by the PID control output of the culture tank temperature controller 5, which adjusts the opening degree of the three-way automatic control valve 3 and increases or decreases the flow rate of hot water from the circulation pump 2. , controlled at a constant temperature.

FIG. 2 shows an operational diagram according to the present invention.
When activated, the valve opening degree of the three-way automatic control valve 3 is continuously controlled by the PID control output of the culture tank temperature controller 5, and the amount of hot water is controlled depending on the magnitude of the absolute value of the deviation between the hot water temperature and the set value. That is, when the absolute value of the deviation of the temperature inside the culture tank is small, the valve opening degree of the three-way automatic control valve 3 becomes small, the amount of hot water flowing in decreases, and the heat exchange rate decreases. When the absolute value of the deviation of the tank internal temperature is large, the valve opening becomes large, the amount of hot water flowing in increases, and the heat exchange rate increases. The temperature in the hot water tank is controlled by the PID control output of the hot water tank temperature controller 10. If the hot water temperature falls below the temperature set value, the heater is controlled to turn on and off, and if the hot water temperature rises above the temperature set value, the heater is turned on and off. The water valve 8 is controlled ON-OFF. The set temperature of the hot water tank temperature controller 10 is changed by the upper and lower limit set values of the culture tank temperature controller 5. When the temperature inside the culture tank is lower than the lower limit set value of the culture tank temperature controller 5, the set temperature of the hot water tank temperature controller 10 is higher than the normal set value, and when it is higher than the lower limit set value, the set temperature is set to the normal setting. Return to value. Moreover, when the temperature inside the culture tank exceeds the upper limit set value of the culture tank temperature controller 5, the temperature becomes lower than the normal set value.

According to this embodiment, the temperature inside the culture tank can be controlled with high precision.

[0014]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the effects as described below.

[0015] By configuring the temperature inside the hot water tank and the temperature inside the culture tank using separate control loops and controlling the amount of hot water inflow using an automatic control valve, highly accurate temperature control is possible. In addition, by increasing or decreasing the temperature setting value of the hot water tank based on the temperature inside the culture tank, it is possible to follow large load fluctuations, and more accurate temperature control is possible.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a culture apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation in FIG. 1;

[Explanation of symbols]

3...Three-way automatic control valve, 4...Temperature detector in the culture tank, 5...Temperature controller in the culture tank, 7...Heater, 8...Cooling water valve, 9...Temperature detector in the hot water tank, 10...Temperature controller in the hot water tank .

Claims (3)

[Claims] Claim 1: A temperature control method for a culture apparatus that controls the temperature of a culture tank having a jacket, wherein the temperature of the culture tank kept warm by the jacket is detected, and the detected temperature is outside a preset temperature range. 1. A temperature control method for a culture apparatus, which comprises supplying hot water from a temperature-controlled hot water tank to a jacket only when the temperature is set, and controlling the temperature of the culture tank to a predetermined temperature. 2. The hot water supplies hot water at a cooling set value of the hot water tank when the temperature of the culture tank exceeds the upper limit set value, and supplies hot water at a cooling set value of the hot water tank when the temperature of the culture tank falls below the lower limit set value. Claim 1 characterized in that the hot water is controlled to be supplied to the temperature setting side.
Temperature control method for the described culture device. 3. The detected temperature of the culture tank is determined by automatically controlling a set value of a hot water tank temperature controller based on a moving average value of the temperature inside the culture tank. Temperature control method for the described culture device.