JPS6114356B2 - - Google Patents

Description

Detailed Description of the Invention This invention can be used to treat so-called altitude sickness when a room is made to have a low pressure and humans are placed in a low-pressure environment for medical experiments, or when the room is made to have a high pressure in the mountains and people are placed in a high-pressure environment to treat so-called altitude sickness. The present invention relates to an indoor pressure control method used in cases where the

Generally, in this type of indoor pressure control, when the indoor pressure is to be reduced, indoor air is sucked in by a vacuum pump via a pressure control valve, and fresh air from outside is introduced into the room at the same time. The pressure in the chamber is reduced at a preset rate by the action of the pressure control valve, and when it reaches a preset value, it is maintained at that set pressure. Furthermore, when increasing the pressure in the room, compressed air is introduced into the room by a compressor or the like, and at the same time, the air in the room is discharged into the atmosphere via a pressure control valve. The pressure in the chamber is increased at a preset rate by the action of the pressure control valve, and when the preset value is reached, it is maintained at that set pressure.

However, in either case, a specially provided external power source has traditionally been used to operate the pressure control valve. For this reason, the overall configuration has become complicated and the manufacturing cost has increased. Additionally, if the power source fails, the pressure control valve will not operate, resulting in excessively low or high pressure in the room, which may be extremely dangerous to the lives of people in the room.

The present invention has been made to eliminate the above-mentioned drawbacks of this type of pressure control method.

This invention either sucks indoor air through a pressure control valve into a vacuum chamber connected to a vacuum pump, or
Alternatively, in a method in which the air is discharged into the atmosphere and the pressure inside the room is controlled by a pressure control valve, an air signal is sent from the pressure controller to the pressure control valve, and the pressure is controlled by the difference between the pressure inside the room and the pressure of the air signal. Operate the valve. If the pressure inside the room is to be low, the pressure inside the room and the pressure in the vacuum chamber are guided into the pressure controller.
The differential pressure between the indoor pressure and the vacuum chamber pressure is used to generate an air signal corresponding to the set pressure. On the other hand, when increasing the pressure in the room, the pressure in the room and the atmospheric pressure are introduced into the pressure controller, and the differential pressure between the pressure in the room and the atmospheric pressure is used to generate an air signal corresponding to the set pressure. The feature is that the pressure in the room is maintained at the set pressure by this.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The drawing shows an indoor pressure control device that lowers the pressure inside the room. In this embodiment, the main chamber 1 and the sub-chamber 2 are
The pressure inside the room is controlled at the same time, and a person entering the room first enters the auxiliary room 2 through the outer door 3, and then through the inner door 4 from the width room 2.
After that, medical experiments and the like are conducted in the main room 1 under a low pressure environment.

In the figure, a main chamber 1 and a sub-chamber 2 are communicated with a common vacuum chamber 7 via pressure control valves 5 and 6, respectively, and the vacuum chamber 7 is connected to a vacuum pump 8. Each pressure control valve 5, 6 operates in response to an air signal from a pressure controller 9, 10, respectively.

The pressure controllers 9 and 10 have the same structure, and the second
As shown in the figure, a valve seat 13 and a valve stem 14 are provided between two ports 11 and 12. The port 11 communicates with the main chamber 1 or the auxiliary chamber 2 via a fixed orifice 15 and a filter 16. Port 12 is connected to the vacuum chamber 7 . Moreover, the port 11 to the main chamber 1 and the sub-chamber 2 is directly communicated with another port 17, and the port 17 is connected to the pressure control valve 5 or 6. The pressure control valves 5 and 6 are normally closed, and a pressure difference is created between the air signal from the port 17 of the pressure controllers 9 and 10, that is, the air pressure, and the indoor pressure of the main chamber 1 and the sub-chamber 2. Although not shown in the figure, it operates and opens in response to a small differential pressure due to the action of a diaphragm or the like.

The valve stems 14 of the pressure regulators 9, 10 are attached to the diaphragm 18, and the diaphragm 18
Springs 19 and 20 are provided on both sides.
The spring 20 on the opposite side of the valve stem 14 is
A lever 22 whose one end is swingably supported on a fulcrum 21
is engaged with. The central end of the lever 22 is connected to a vacuum bellows 23, and the other end is engaged with a spring 24. The compression force of spring 24 can be adjusted by operating knob 25.

Ports 11 to the main chamber 1 and auxiliary chamber 2 and ports 17 to the pressure control valves 5 and 6 are communicated with the opposite side of the diaphragm 18 via a filter 26 and an orifice 27. The opening degree of the orifice 27 can be adjusted by operating a knob 28.

Further, a manual valve 29 is provided inside and outside the main chamber 1 and the sub-chamber 2, which can shut off the flow paths between the vacuum chamber 7 and the ports 12 of the pressure controllers 9 and 10.

The main chamber 1 is further communicated with the outside atmosphere via fixed orifices 30, 31 and an electromagnetic shut-off valve 32.
The subchamber 2 is communicated with the atmosphere via a fixed orifice 33.

In the apparatus configured as described above, the vacuum pump 8 is driven to suck the air in the vacuum chamber 7,
When the pressure in the vacuum chamber 7 decreases, the pressure controllers 9,1
The air in the chamber is sucked through the port 12 of the valve 0 and the valve seat 13, and the pressure in the chambers of the pressure controllers 9 and 10 is reduced. Therefore, a pressure difference is generated between the chambers of the pressure controllers 9 and 10 and the main chamber 1 and auxiliary chamber 2 due to the action of the fixed orifice 15, and an air signal is sent from the port 17 to the pressure control valves 5 and 6, causing the pressure The control valves 5 and 6 operate and open using the differential pressure between the pressure of the air signal and the indoor pressure of the main chamber 1 and the sub-chamber 2 as a driving force. Therefore, the air in the main chamber 1 and the auxiliary chamber 2 is supplied to the pressure control valves 5 and 6.
The air is sucked into the vacuum chamber 7, and the pressure in the main chamber 1 and sub chamber 2 decreases. At the same time, fresh air is supplied from the outside through the fixed orifices 30 and 33 to the main room 1.
It is introduced into the subchamber 2. The rate of decrease in the indoor pressure is determined by the amount of air discharged from the pressure control valves 5, 6 and the amount of air introduced from the fixed orifices 30, 33.

When the pressure inside the pressure controllers 9 and 10 decreases, the valve stem 14 moves in the direction of closing the valve seat 13 due to the differential pressure on both sides of the diaphragm 18. The air is also introduced into the valve stem 14 through an air orifice 27 on the opposite side of the diaphragm 18, that is, on the bellows 23 side. Therefore, the degree of opening of the orifice 27 affects the differential pressure on both sides of the diaphragm 18, which in turn affects the operating position of the valve stem 14.

The amount of air discharged from the main chamber 1 and the sub chamber 2 from the pressure control valves 5 and 6 is determined by the operating positions of the pressure control valves 5 and 6. The pressure control valves 5 and 6 are operated by the pressure difference between the indoor pressure of the pressure controllers 9 and 10 and the indoor pressure of the main chamber 1 and the auxiliary chamber 2.
Since the indoor pressure at 0 is influenced by the operating position of the valve stem 14 that controls the port 12 to the vacuum chamber 7, the rate of decrease in the indoor pressure in the main chamber 1 and the auxiliary chamber 2 ultimately depends on the opening degree of the orifice 27. determined by. Therefore, operate the knob 28 to open the orifice 27.
By adjusting the degree of opening of the main chamber 1 and the sub-chamber 2, the rate of decrease in the indoor pressure of the main chamber 1 and the sub-chamber 2 can be arbitrarily set.

Moreover, the air in the main chamber 1 and the sub-chamber 2 is introduced into the pressure controllers 9 and 10 through the fixed orifice 15. Therefore, when the pressure inside the main chamber 1 and the auxiliary chamber 2 reaches a predetermined value, the differential pressure on both sides of the diaphragm 18 and the acting forces of the bellows 23 and the spring 24 are balanced, and the valve stem 14 is in the current position. The pressure in the main chamber 1 and the sub-chamber 2 is maintained at the pressure at that time. Therefore, by operating the knob 25 to adjust the compression force of the spring 24,
The final pressures in the main chamber 1 and the sub chamber 2 can be set arbitrarily.

If the pressure controllers 9 and 10 fail during an experiment, closing the manual valve 29 indoors or outdoors in the main chamber 1 and the sub-chamber 2 will cause the vacuum chamber 7 and the pressure controllers 9,
10 and port 12 can be blocked, so that no air signal is sent to the pressure control valves 5, 6, and the pressure control valves 5, 6 are closed. Therefore, the indoor pressures in the main chamber 1 and the auxiliary chamber 2 do not decrease excessively.

When the indoor pressure in the main chamber 1 and auxiliary chamber 2 is returned to atmospheric pressure after the experiment is finished, the electromagnetic on-off valve 32 is opened and outside air is introduced into the main chamber 1 through both fixed orifices 30 and 31. The pressure in the main chamber 1 increases rapidly.

In short, this control method uses pressure controllers 9, 1
0 to the pressure control valves 5 and 6, and the control valves 5 and 6 are operated by the pressure difference between the indoor pressure and the pressure of the air signal. Then, the pressure inside the room and the pressure in the vacuum chamber 7 are introduced into the pressure controllers 9 and 10, and the pressure difference between the pressure inside the room and the pressure in the vacuum chamber 7 is used to generate an air signal corresponding to the set pressure. This maintains the pressure in the room at the set pressure. Therefore, there is no need to provide a special power source for operating the pressure control valve as in the prior art.

Further, in the embodiment described above, the case where the pressure inside the room is made low has been explained, but this control method can also be used when the pressure inside the room is made high. In this case, compressed air is introduced into the room by the compressor, and the air in the room is discharged into the atmosphere via the pressure control valves 5 and 6. Then, instead of the pressure in the vacuum chamber 7 of the above embodiment, atmospheric pressure is introduced into the pressure controllers 9 and 10, and the air signal corresponding to the set pressure is generated using the differential pressure between the indoor pressure and the atmospheric pressure. It is only necessary to generate it and send it to the pressure control valves 5 and 6. This allows the pressure in the room to be maintained at the set pressure.

As described above, the present invention generates an air signal corresponding to a set pressure by using the differential pressure between the indoor pressure and the vacuum chamber pressure or atmospheric pressure. and,
The pressure control valve is operated by the pressure difference between the indoor pressure and the air signal pressure, and there is no need to provide a special power source to operate the pressure control valve.
Therefore, the overall configuration can be simplified and manufacturing costs can be reduced. Furthermore, the inconvenience caused when the conventional special power source breaks down can be eliminated, and the intended purpose can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a sectional view of the pressure controller shown in FIG. 1, 2... Chamber, 5, 6... Pressure control valve, 7...
Vacuum chamber, 8... vacuum pump, 9, 10... pressure controller.

Claims (1)

[Claims] 1 The air in the room is sucked into the vacuum chamber 7 connected to the vacuum pump 8 through the pressure control valves 5 and 6, or is exhausted to the atmosphere, and the pressure in the room is controlled by the control valves 5 and 6. The control method includes sending an air signal from the pressure control valves 9 and 10 to the control valves 5 and 6, and operating the control valves 5 and 6 based on the pressure difference between the pressure in the room and the pressure of the air signal. At the same time, the pressure in the chamber and the pressure in the vacuum chamber 7 or the atmospheric pressure are introduced into the controllers 9 and 10, and the pressure difference between the pressure in the chamber and the pressure in the vacuum chamber 7 or the atmospheric pressure is used. A method for controlling indoor pressure, characterized in that the pressure in the room is maintained at the set pressure by generating an air signal corresponding to a set pressure.