JPS6229358Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic control device for temperature and humidity in a hyperbaric chamber of a deep-sea diving device or the like.

DDC (shipboard decompression chamber), a diving device used for various diving operations including deep-sea diving, deep-sea diving training equipment, and hyperbaric chambers for diving medicine, hyperbaric physiology, experiments, and treatment equipment, are used to house divers while diving. In order to pressurize, hold, and depressurize, divers live for long periods in an environment of high-pressure helium/oxygen mixed gas, helium/nitrogen/oxygen mixed gas, high-pressure air, and high-pressure mixed gas of oxygen/nitrogen. Must. In order to maintain the lives and health of these divers, it is necessary to appropriately control the indoor gas pressure and gas composition, as well as the indoor temperature and humidity.

In particular, helium gas has a higher thermal conductivity than air, which increases body heat loss from the diver.
In order to maintain the safety and health of divers, indoor temperature and
Humidity must be controlled within very narrow tolerance ranges.

However, among these, humidity is mutually influenced by the pressure, temperature, composition of the gas, etc. of the indoor gas. Conventional humidity sensors include hair hygrometers, wood chip hygrometers, lithium chloride hygrometers, etc., but all of these are used in atmospheric pressure air, and as described above under high pressure mixed gases such as helium. It does not take into account mutual influences.

For other reasons, there is still no adequate temperature and humidity control in the conventional hyperbaric chamber. The chamber pressure and gas composition are determined according to the diving task, but in order to control the temperature and humidity under these conditions while taking into account the above-mentioned mutual influences,
Conventionally, humidity control is carried out manually using silica gel or the like to create the most desirable humidity environment by manually reading the wet-bulb temperature and dry-bulb temperature displayed on a psychrometric thermometer or the like and judging the above-mentioned mutual influences.

However, if this is done manually, proper control is difficult and complicated. Further, adjusting the humidity by manual operation in this way naturally affects the temperature, causing temperature fluctuations, and it is very difficult to control the temperature within an extremely narrow tolerance range.

This invention aims to provide a suitable automatic control device for temperature and humidity in order to eliminate the drawbacks of such conventional devices.

In other words, it is well known that a dehumidifying air cooler has been used to lower humidity as a means of regulating humidity, but the present invention measures humidity in a high-pressure mixed gas environment such as helium using the dew point temperature (i.e., relative humidity).
After cooling the gas to the dew point temperature corresponding to the desired relative humidity and removing excess moisture,
A predetermined humidity is obtained by reheating to a desired temperature, and the control device according to the present invention actively attempts to create a high-pressure gas environment with a desired relative humidity and temperature. Appropriate humidity under high pressure varies and is determined by various factors such as moisture content in the air, temperature, pressure, and gas composition.
Relative humidity is calculated using the diagram shown in the figure.

This invention reversely utilizes this to input factor data into the set dew point temperature calculator, and automatically calculates the dew point temperature to obtain the desired appropriate humidity according to the relationship shown in the diagram in Figure 2. The humidity is automatically adjusted by adjusting the output of the dehumidifying cooler and the humidifier to reach the set dew point temperature, and the temperature is also automatically adjusted appropriately.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 indicates a hyperbaric chamber of a deep-sea diving device or the like. A circulation system for environmental control such as adjusting the temperature and humidity in the room and absorbing and removing carbon dioxide gas is provided, and a circulation blower 2 circulates the gas.

A dehumidifying cooler 3, a dew point measuring temperature sensor 4, and a warmer 5 are disposed in this circulation system in this order from upstream. Further, a dew point temperature controller 6 and a set dew point temperature calculator 7 are provided to control the output of the dehumidifying cooler 3.
Further, a temperature regulator 8 for controlling the warmer 5 is provided. The pressure, each gas composition, set temperature, and set humidity are input to the set dew point temperature calculator 7.

The output from the set dew point temperature calculator 7 and the signal from the dew point measuring temperature sensor 4 are input to the dew point temperature regulator 6, and the dehumidifying air cooler 3 is controlled by the output. The set temperature and room temperature are input to the temperature controller 8, and the warmer 5 is controlled by the output.

The set dew point temperature calculator 7 calculates the dew point temperature for obtaining a desired set humidity according to the pressure in the high pressure chamber 1, the gas composition, and the set temperature according to the relationship shown in the diagram of FIG.

As this input, pressure is input from a pressure sensor 11 via a pressure measuring device 12 . As for the gas composition, signals measured by an oxygen concentration meter 13 and a nitrogen concentration meter 14 are input. The helium gas concentration will be calculated as [100% - oxygen concentration % - nitrogen concentration %]. The set humidity is determined by the humidity setting device 15.
The set temperature is set and input using the temperature setting device 16.

The set dew point temperature calculator 7 calculates a dew point temperature for obtaining a desired relative humidity based on the input signals of these data, and sends the output signal to the dew point temperature regulator 6 .

The dew point temperature controller 6 compares the input set dew point temperature signal with the signal from the dew point measuring temperature sensor 4, and sends the output to the dehumidifying cooler 3 to increase or decrease the output of the dehumidifying cooler 3. The temperature regulator 8 compares the input set temperature signal from the temperature setting device 16 and the signal from the room temperature sensor 17, and sends the output to the warmer 5 to increase or decrease the output of the warmer 5.

If a signal from the dew point temperature sensor 4, which is provided with a system indicated by a dotted line 18 in FIG. 1, is input to the temperature controller 8, a faster response and more precise temperature control will be possible. In a state where the temperature and humidity are controlled in this way, the signal from the dew point temperature controller 6 is sent to the humidity display 15 via the relative humidity calculator 7A.
By displaying the humidity on A and the temperature on the temperature display 16A based on the signal from the temperature controller 8, the temperature and humidity in the high pressure chamber can be constantly monitored.

In general, moisture tends to be generated in hyperbaric chambers due to sweating by divers, and in a high-pressure helium mixed gas environment, it is necessary to maintain the temperature at a higher temperature than in the atmosphere. In the system, a humidifier 3A is provided before or after the dehumidifying cooler 3, and a duct having a damper 5A for flow rate adjustment is provided in parallel with the warmer 5, and a dew point temperature controller 6 is provided in each case. , and a temperature regulator 8 may be used to control temperature and humidity. Additionally, carbon dioxide absorbers, CO converters, deodorizers, sterilizing filters, etc. may be incorporated into the circulation system, but these are omitted from the drawing.

Further, although the drawings show a system in which the circulation system is provided outside, it may also be provided in the high pressure chamber. When installed externally, it is convenient for maintenance and maintenance of the device, and when installed internally, there is an advantage that the circulation system does not need to have a pressure-resistant structure.

As explained above, by providing the automatic temperature and humidity control device of the hyperbaric chamber according to the present invention, it is possible to easily and accurately adjust the temperature and humidity. Significant improvements can be expected in ensuring safety and operating equipment.

[Brief explanation of the drawing]

Figure 1 is a system diagram of the control device according to the present invention;
The figure is a humidity chart in a mixed gas under high pressure. 1... Hyperbaric chamber, 2... Circulating blower, 3... Cooler for dehumidification, 3A... Humidifier, 4... Temperature sensor for dew point measurement, 5... Warmer, 5A... Cooler,
6... Dew point temperature controller, 7... Set dew point temperature calculator, 7A... Relative humidity calculator, 8... Temperature controller, 11... Pressure sensor, 12... Pressure measuring device, 13... Oxygen concentration Measuring device, 14...Nitrogen concentration measuring device, 15...Humidity setting device, 15A...Humidity display device, 16...Temperature setting device, 16A...Temperature display device, 17...Indoor temperature sensor.

Claims (1)

[Scope of utility model registration request] In the gas circulation system of the hyperbaric chamber, there is an output signal from a set dew point temperature calculator that calculates the required dew point temperature based on the input signals of the pressure in the room, the concentration of each constituent gas, the set temperature, and the set humidity. A dehumidifying air cooler is controlled by a dew point temperature controller that operates by comparing each input signal of the output signal from the provided dew point measuring temperature sensor, and each input signal from the set temperature and room temperature sensor. 1. A temperature/humidity control device for a hyperbaric room, characterized by interposing a warmer controlled by a temperature regulator that operates in comparison.