KR102126880B1 - Room pressure control system and method - Google Patents

Abstract

The present invention provides an actual pressure control system capable of maintaining a constant actual pressure even when there is no differential pressure sensor for measuring the actual pressure.
The actual pressure control system includes an air supply valve (MAV) for adjusting the air flow rate of the air blow-off to the room 100, a general exhaust valve (GEX) for adjusting the air flow rate of the exhaust air from the room 100, and air and air flow rates. When at least one of the supply air volume and the exhaust air volume is determined so as to match the difference of the offset air volume setting value, the air supply valve (MAV) and the general exhaust valve (GEX) are controlled, and the air supply air volume is changed with respect to the previous air supply air volume. , A controller 108 for correcting the offset air flow set value so that the actual pressure becomes a desired value according to the air supply air flow after the change.

Description

Real pressure control system and method{ROOM PRESSURE CONTROL SYSTEM AND METHOD}

The present invention relates to an actual pressure control system that maintains a constant actual pressure by controlling the supply air volume or the exhaust air volume in the room.

The actual pressure control system maintains a constant pressure in the room in order to prevent biochemicals from leaking out of the room or impurities from the outside or entering the room, for example when experimenting with handling the biochemicals in a fume hood. System. In this actual pressure control system, control is performed to maintain the room's negative and positive pressure by controlling the air supply valve and the exhaust valve so that the difference between the air volume of the air supply to the room and the air volume of the exhaust air drawn from the room is a predetermined air volume (offset air volume). All.

In addition, recently, in order to improve the accuracy of the actual pressure control, a system for correcting the offset air volume based on the measured value of the actual pressure from the differential pressure sensor has been proposed (see Patent Documents 1 and 2). In the actual pressure control system disclosed in Patent Document 1, the offset air flow is corrected in accordance with the deviation only when the deviation between the actual pressure set value and the actual pressure measurement value exceeds a predetermined value. In addition, in the actual pressure control system disclosed in Patent Document 2, in order to perform stable actual pressure control, the fluctuation of the measured value of the actual pressure is alleviated, and the offset air volume is corrected according to the measured value of the actual pressure where the fluctuation is relaxed, or the air volume is set. It is done to limit the rate of change.

However, in the actual pressure control system disclosed in Patent Literature 1 and Patent Literature 2, there has been a problem that a differential pressure sensor for measuring actual pressure is required.

Patent Document 1: Japanese Patent No. 5552387 Patent Document 2: Japanese Patent Publication No. 2006-78010

The present invention has been made to solve the above problems, and an object of the present invention is to provide an actual pressure control system and method capable of maintaining a constant actual pressure even when there is no differential pressure sensor for measuring the actual pressure.

The actual pressure control system of the present invention includes an air supply valve configured to adjust the air volume of the air supply blown out to a target room, a general exhaust valve configured to adjust the air volume of exhaust air drawn from the target room, and an air supply controlled by the air supply valve Controlling the air supply valve and the general exhaust valve by determining at least one of the air supply air volume and the general exhaust air volume so that the difference between the air volume and the general exhaust air volume regulated by the general exhaust valve matches a preset offset air volume set value. And an air flow balance control unit configured to correct the offset air flow setting value so that the actual air pressure becomes a desired value according to the air supply air volume after the change when the air supply air volume is changed with respect to the air supply air volume immediately before the change. It is characterized by.

In addition, one configuration example of the actual pressure control system of the present invention further includes a local exhaust system installed in the target room, and a local exhaust valve configured to adjust the exhaust air volume of the local exhaust system, wherein the air volume balance control unit comprises the air supply The air supply air volume regulated by the air supply valve and the general exhaust valve so that the difference between the air supply air volume regulated by the valve and the total exhaust air volume regulated by the local exhaust valve and the general exhaust valve matches the offset air volume set value. It is characterized by determining at least one of the general exhaust air volume controlled by.

In addition, one configuration example of the actual pressure control system of the present invention further includes an air volume changing unit configured to issue an instruction for changing the air supply air volume to the air volume balance control unit according to a preset schedule or an instruction from the outside, and the air volume balance control unit The general exhaust air volume is determined according to the air supply air volume changed by the air volume changing unit.

In addition, one configuration example of the actual pressure control system of the present invention further includes an air volume calculating unit configured to calculate the air supply air volume according to the load condition of the target room, and the air volume balance control unit is configured to be configured according to the air supply air volume calculated by the air volume calculating unit. It is characterized by determining the general exhaust air volume.

In addition, in the actual pressure control method of the present invention, the difference between the air supply air volume regulated by the air supply valve installed in the target room and the exhaust air air volume adjusted by the general exhaust valve installed in the target room matches the preset offset air flow setting value. A first step of determining at least one of the supply air flow rate of the air supply valve and the exhaust air flow rate of the general exhaust valve, and controlling the air supply valve and the general exhaust valve; and when the air supply air volume is changed with respect to the immediately preceding air supply air volume, And a second step of correcting the offset air volume set value so that the actual pressure becomes a desired value according to the air supply air volume after the change.

According to the present invention, by providing the offset air volume correcting unit and correcting the offset air volume setting value according to the air supply air volume, it is possible to maintain the constant pressure even when there is no differential pressure sensor for measuring the actual pressure or the actual pressure control valve for adjusting the actual pressure. It becomes possible.

1 is a block diagram showing the configuration of an actual pressure control system according to a first embodiment of the present invention.
2 is a block diagram showing a configuration example of a controller for local exhaust according to a first embodiment of the present invention.
3 is a block diagram showing a configuration example of a controller for supplying air according to a first embodiment of the present invention.
4 is a block diagram showing a configuration example of a controller for general exhaust according to a first embodiment of the present invention.
5 is a block diagram showing a configuration example of a controller for controlling the entire system according to the first embodiment of the present invention.
6 is a flowchart for explaining the operation of controlling the air volume balance of the actual pressure control system according to the first embodiment of the present invention.
7 is a block diagram showing a configuration example of a controller for controlling the entire system of the actual pressure control system according to the second embodiment of the present invention.
8 is a flow chart for explaining the operation of the air volume change control of the actual pressure control system according to the second embodiment of the present invention.
9 is a block diagram showing the configuration of an actual pressure control system according to a third embodiment of the present invention.
10 is a block diagram showing a configuration example of a controller for supplying air according to a third embodiment of the present invention.
11 is a flowchart for explaining the temperature control operation of the actual pressure control system according to the third embodiment of the present invention.

[First Embodiment]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a block diagram showing the configuration of an actual pressure control system according to a first embodiment of the present invention. The actual pressure control system of this embodiment includes a fume hood 101 installed in the room 100, a local exhaust duct 102 connected to the fume hood 101, and an air supply duct 103 that supplies air to the room 100. Wow, the general exhaust duct 104 for exhausting the air in the room 100, the local exhaust valve EXV for adjusting the air volume of the local exhaust duct 102, and the air supply valve for adjusting the air volume in the air supply duct 103 (MAV), a general exhaust valve (GEX) for adjusting the air volume of the general exhaust duct 104, a controller (105) for controlling a local exhaust valve (EXV), and a controller (106) for controlling the air supply valve (MAV) ), a controller 107 that controls the general exhaust valve (GEX), a controller 108 that controls the entire system, and a communication line 109 that connects each of the controllers 105, 106, 107, and 108 to each other. do. The fume hood 101 includes a sash 110 that can be opened and closed, and a sash sensor 111 that detects the opening degree of the sash 110.

2 is a block diagram showing a configuration example of the controller 105, FIG. 3 is a block diagram showing a configuration example of the controller 106, FIG. 4 is a block diagram showing a configuration example of the controller 107, and FIG. 5 Is a block diagram showing a configuration example of the controller 108.

The controller 105 is equipped with an exhaust air volume control unit 1050 that controls the local exhaust valve EXV. The controller 106 includes an air supply air volume control unit 1060 that controls the air supply valve MAV. The controller 107 is provided with an exhaust air volume control unit 1070 for controlling the general exhaust valve GEX.

The controller 108 is configured such that the difference between the air supply air volume regulated by the air supply valve MAV and the exhaust air air volume regulated by the local exhaust valve EXV and the general exhaust valve GEX coincides with the offset air flow setting value. Air volume balance control unit 1080 for determining the supply air volume adjusted by) and the general exhaust air volume controlled by the general exhaust valve (GEX), and offset air volume correction unit 1081 for correcting the offset air volume set value according to the air supply volume. It is equipped with.

Next, the air volume balance control operation of the actual pressure control system of this embodiment will be described. 6 is a flowchart for explaining the air volume balance control operation. Here, the air volume of the air blown out from the air supply duct 103 is Vmav, the air flow rate of the air exhausted from the general exhaust duct 104 is Vgex, and the air flow rate of the air exhausted from the local exhaust duct 102 is Vexv.

The exhaust air volume control unit 1050 of the controller 105 acquires the opening degree information of the chassis 110 from the chassis sensor 111 of the fume hood 101 (step S1 in FIG. 6 ). Then, the exhaust air volume control unit 1050 determines the air volume Vexv so that the surface wind speed of the chassis surface becomes a prescribed value based on the sash opening area of the fume hood 101, and the exhaust air volume of the local exhaust duct 102 is Vexv The opening degree of the local exhaust valve EXV is controlled so as to be (Fig. 6 step S2). The area of the sash opening of the fume hood 101 can be determined by the product of the height of the opening of the sash 110 and the known sash width, which can be obtained from the sash opening degree detected by the sash sensor 111.

Next, in the air flow balance control unit 1080 of the controller 108, the difference between the air supply air volume (Vmav) and the air flow rate (Vgex+Vexv) is calculated according to the local air flow rate (Vexv) calculated by the exhaust air flow control part (1050). The supply air volume Vmav and the general exhaust air volume Vgex are determined to match the offset air volume set value α (FIG. 6 step S3).

Vmav=Vgex+Vexv+α...(1)

However, the air volume balance control unit 1080 determines the air supply air volume Vmav so as to satisfy the minimum air volume of the room 100 and at least always eject the minimum air volume. The offset air flow amount setting value α determines the amount of air leaking from the room 100 and is a value for determining whether the room 100 is to be at a positive pressure or at a negative pressure.

In addition, when the fume hood 101 is not being used (that is, when the chassis 110 is completely closed), Equation (2) holds.

Vmav=Vgex+α...(2)

The air supply air volume control unit 1060 of the controller 106 controls the opening degree of the air supply valve MAV so that the air volume of the air supply duct 103 becomes the air volume Vmav determined by the air volume balance control unit 1080 (FIG. 6 step) S4).

The exhaust air volume control unit 1070 of the controller 107 controls the opening degree of the general exhaust valve GEX so that the exhaust air volume of the general exhaust duct 104 becomes the air volume Vgex determined by the air volume balance control unit 1080 ( Fig. 6 Step S5).

According to the above air volume balance control operation, when the local exhaust air volume Vexv is changed according to opening and closing of the sash 110 of the fume hood 101, the air supply air volume Vmav is also changed according to the change. When operating in such a different air volume band, if the offset air volume setting value α remains the same, the degree of actual pressure may change.

Even if the offset air flow amount set value α is the same, the factors in which the degree of the actual pressure is changed by the air supply air volume Vmav are the individual air flow characteristics of the air supply valve MAV and the unevenness of the actual air flow due to the ductwork. As an example of the individual air volume characteristics of the air supply valve MAV, for example, there is an example in which the air supply valve MAV has a negative air volume error in the low air volume region and a positive air volume error in the high air volume region. In addition, unevenness may occur in the actual air volume due to the individual piping conditions of the air supply duct 103.

Adjustment of the pressure when the actual pressure is changed is possible if the actual pressure control valve (PCV) is provided, but when the factors causing the actual pressure to change are due to the characteristics of the air supply valve (MAV) and the air supply duct 103, the air supply In most cases, there is reproducibility in the relationship between the air volume (Vmav) and the degree of actual pressure.

Thus, in this embodiment, the offset air flow amount setting value α is corrected according to the air supply air flow amount Vmav. Specifically, the offset air volume correcting unit 1081 of the controller 108 is the case where the air supply air volume Vmav determined in step S3 is changed with respect to the air supply air volume Vmav immediately before (YES in FIG. 6 step S6), The offset air flow setting value α is corrected so that the actual pressure becomes a desired value according to the air supply air volume Vmav after the change (FIG. 6 step S7).

In the stage of construction of the room 100 and the adjustment of the fume hood 101 and the air conditioning equipment installed in the room 100, if the characteristics of the actual pressure in the room 100 are investigated, the actual pressure is the desired offset. It is possible to determine the air volume set value α for each air supply air volume Vmav. The relationship between the air supply air volume Vmav and the offset air volume set value α may be registered in advance in the offset air volume correction unit 1081.

The registration of the relationship between the supply air volume (Vmav) and the offset air volume set value (α) may be in the form of registering a formula (for example, a linear equation), or the offset air volume set value (α) corresponding to the air supply air volume (Vmav) is database. It may be a form to be registered in. When the equation is registered, the offset air volume correcting unit 1081 calculates the offset air volume setting value α by inputting the air supply air volume Vmav into the formula. In addition, when the database is prepared, the offset air volume correcting unit 1081 acquires the offset air volume setting value α corresponding to the air supply air volume Vmav from the database.

In this way, the processing of steps S1 to S7 is repeatedly performed for each control cycle until, for example, the air volume control ends according to an instruction from the user (YES in step S8 in FIG. 6).

In this embodiment, by correcting the offset air volume set value α according to the air supply air volume Vmav, even when there is no differential pressure sensor for measuring the actual pressure or the actual pressure control valve (PCV) for adjusting the actual pressure, the actual pressure is kept constant. It becomes possible to do.

[Second Embodiment]

In the first embodiment, the case where the air supply air volume Vmav is changed by the opening and closing of the local exhaust valve EXV according to the opening and closing of the sash 110 of the fume hood 101 is described as an example, but the air supply air volume Vmav There are other factors that change ), and it is possible to apply the present invention to all these factors. As another example in which the air supply air volume Vmav is changed, the air supply air volume Vmav and the exhaust air volume are maintained while maintaining a constant pressure difference between the inside and outside in order to save energy in a time when there is no person such as a night or holiday when work is not performed. There is an air volume change control operation to lower (Vgex). This air volume change is performed on weekdays every day. In the example of switching from day to night, the supply air volume (Vmav) and the exhaust air volume (Vgex) are gradually reduced together, and in the example from night to day switching, the supply air volume (Vmav) and the exhaust air volume (Vgex) are gradually reduced together. Increase.

Also in this embodiment, the overall configuration of the actual pressure control system and the configuration of the controllers 105 to 107 are the same as those in the first embodiment, and will be explained using reference numerals in Figs.

7 is a block diagram showing a configuration example of the controller 108 of the present embodiment. The controller 108 of the present embodiment is an air volume balance control unit 1080, an offset air volume correction unit 1081, and an air volume for instructing an air volume change to the air volume balance control unit 1080 according to a preset schedule or an instruction from the outside. A change unit 1082 is provided.

8 is a flowchart for explaining the air volume change control operation of the present embodiment. When the air volume changing unit 1082 of the controller 108 changes the air volume according to a preset schedule (for example, when switching from day to night time zone or when switching from night to day time zone), or when changing the air volume from outside In the case of receiving the instruction (YES in step S10 of FIG. 8 ), an instruction is made to change the air supply volume Vmav to the air volume balance control unit 1080 (FIG. 8 step S11 ).

The air volume balance control unit 1080 that receives the instruction from the air volume changing unit 1082 gradually changes the air supply air volume Vmav (FIG. 8 step S12). At this time, the air volume balance control unit 1080 also changes the exhaust air volume (Vgex) according to the change in the air supply air volume (Vmav), but determines the exhaust air volume (Vgex) so that Equation (1) or Equation (2) is established even after the air volume change. do.

The air supply air volume control unit 1060 of the controller 106 controls the opening degree of the air supply valve MAV so that the air volume of the air supply duct 103 becomes the air volume Vmav determined by the air volume balance control unit 1080 (FIG. 8 step) S13).

The exhaust air volume control unit 1070 of the controller 107 controls the opening degree of the general exhaust valve GEX so that the exhaust air volume of the general exhaust duct 104 becomes the air volume Vgex determined by the air volume balance control unit 1080 ( 8 step S14).

The operation of the offset air volume correction section 1081 of steps S15 and S16 is the same as steps S6 and S7 of the first embodiment.

In this way, the processes of steps S12 to S16 are repeatedly performed for each control period until the air supply air volume Vmav reaches a predetermined air flow value or a predetermined air flow value (YES in step S17 in FIG. 8). The air volume balance control after the air volume change is as described in the first embodiment.

In addition, in this embodiment, the fume hood 101 is not an essential configuration requirement, and is applicable to a room where the fume hood 101, the local exhaust valve EXV, and the controller 105 are not installed.

[Third Example]

Next, a third embodiment of the present invention will be described. In this embodiment, as another example in which the air supply air volume Vmav is changed, a case where the air supply air volume Vmav is changed by temperature control will be described. 9 is a block diagram showing the configuration of the actual pressure control system according to the present embodiment. Also in this embodiment, since the configuration of the controllers 105, 107, and 108 is the same as that of the first embodiment, it will be described using reference numerals in Figs.

10 is a block diagram showing a configuration example of the controller 106 of this embodiment. The controller 106 of the present embodiment includes an air supply air volume control unit 1060 and an air volume calculation unit 1061 that calculates the air supply air volume Vmav according to the load situation of the room 100.

11 is a flowchart for explaining the temperature control operation of this embodiment. The air flow calculating unit 1061 of the controller 106 acquires the indoor temperature measurement value measured by the temperature sensor 112 of the room 100 (FIG. 11 S20), and the obtained indoor temperature measurement value and the indoor temperature setting value The air supply air volume Vmav required for the room 100 is calculated based on the deviation (step S21 in FIG. 11 ). That is, the air volume calculating unit 1061 calculates the air supply air volume Vmav so that the indoor temperature measurement value is equal to the indoor temperature set value.

The air volume balance control unit 1080 of the controller 108 changes the exhaust air volume Vgex according to the value of the air supply air volume Vmav calculated by the air volume calculation unit 1061 (FIG. 11 step S22). At this time, the air volume balance control unit 1080 determines the exhaust air volume Vgex so that Equation (1) or Equation (2) holds after changing the air volume.

The air supply air volume control unit 1060 of the controller 106 controls the opening degree of the air supply valve MAV so that the air volume of the air supply duct 103 becomes the air volume Vmav determined by the air volume calculation unit 1061 (FIG. 11 step S23) ).

The exhaust air volume control unit 1070 of the controller 107 controls the opening degree of the general exhaust valve GEX so that the exhaust air volume of the general exhaust duct 104 becomes the air volume Vgex determined by the air volume balance control unit 1080 ( Fig. 11 Step S24).

The operation of the offset air volume correction section 1081 of steps S25 and S26 is the same as steps S6 and S7 of the first embodiment.

In this way, the processing of steps S20 to S26 is repeatedly performed for each control cycle until, for example, air flow control ends by an instruction from the user (YES in step S27 in FIG. 11).

In addition, as in the second embodiment, the fume hood 101 is not an essential configuration requirement, and the present embodiment is also applied to a room where the fume hood 101, the local exhaust valve (EXV), and the controller 105 are not installed. It is possible.

Each of the controllers 105, 106, 107, and 108 described in the first to third embodiments is controlled by a computer having a CPU (Central Processing Unit), a storage device and an interface, and a program for controlling their hardware resources. Can be realized. The CPU of each controller executes the processing described in the first to third embodiments according to the program stored in the storage device.

In the first to third embodiments, a fume hood is shown as an example of a local exhaust system, but the present invention is also applicable to a local exhaust system that achieves the same role as a fume hood, such as a safety cabinet or a draft chamber.

Further, in the first to third embodiments, the case where one local exhaust device is provided in the room 100 has been described, but the present invention is applicable even when a plurality of local exhaust devices is provided.

The present invention can be applied to an actual pressure control system.

100… Room, 101… Hume hood, 102... Local exhaust duct, 103… Air supply duct, 104… General exhaust duct, 105, 106, 107, 108… Controller, 109… Communication line, 110… Chassis, 111… Chassis sensor, 112… Temperature sensor, 1050, 1070... Exhaust air volume control, 1060… Air supply air volume control, 1061… Air volume calculation unit, 1080... Air volume balance control, 1081... Offset air volume correction unit, 1082. Air volume change part, EXV… Local exhaust valve, MAV… Supply valve, GEX… General exhaust valve.

Claims (8)

In the actual pressure control system,
An air supply valve configured to adjust the air volume of the air supply to the target room,
A general exhaust valve configured to adjust the air volume of the exhaust air discharged from the target room;
At least one of the air supply air volume and the general exhaust air flow is determined so that the difference between the air supply air volume regulated by the air supply valve and the general air flow rate controlled by the general exhaust valve matches a preset offset air volume setting value, An air volume balance control unit configured to control a valve and the general exhaust valve;
When the air supply air volume is changed with respect to the air supply air volume immediately before, the offset air volume correction unit configured to correct the offset air volume setting value so that the actual pressure becomes a desired value according to the air supply air volume after the change.
Including,
The relationship between the air supply air volume and the offset air volume set value is determined in advance. According to claim 1,
A local exhaust system installed in the target room,
Local exhaust valve configured to regulate the exhaust air volume of this local exhaust system
Further comprising,
The air volume balance control unit is adjusted by the air supply valve so that the difference between the air supply air volume regulated by the air supply valve and the total exhaust air volume adjusted by the local exhaust valve and the general exhaust valve matches the offset air volume set value. The actual pressure control system, characterized in that for determining at least one of the air supply air volume and the general exhaust air volume controlled by the general exhaust valve. The method according to claim 1 or 2,
In addition to the preset schedule or an instruction from the outside, further comprising an air volume change unit configured to issue an instruction to change the air supply air volume to the air volume balance control unit
The air volume balance control unit determines the general exhaust air volume according to the air supply air volume changed by the air volume changing unit. The method according to claim 1 or 2,
Further comprising an air volume calculating unit configured to calculate the air supply air volume according to the load situation of the target room,
The air volume balance controller determines the general exhaust air volume according to the air supply air volume calculated by the air volume calculation unit. In the actual pressure control method,
The air supply air volume of the air supply valve and the general exhaust so that the difference between the air supply air volume regulated by the air supply valve installed in the target room and the general air flow rate controlled by the general exhaust valve installed in the target room matches a preset offset air flow setting value A first step of determining at least one of the general exhaust air volume of the valve, and controlling the air supply valve and the general exhaust valve,
A second step of correcting the offset air volume setting value so that the actual pressure becomes a desired value according to the air supply air volume after the change, when the air supply air volume is changed with respect to the air supply air volume immediately before the change
Including,
The relationship between the air supply air volume and the offset air volume set value is determined in advance. The method of claim 5,
Further comprising a third step of controlling the local exhaust valve of the local exhaust system installed in the target room,
The first step is adjusted by the air supply valve so that the difference between the air supply air volume regulated by the air supply valve and the total exhaust air volume adjusted by the local exhaust valve and the general exhaust valve matches the offset air volume set value. And determining at least one of the supply air flow rate and the general exhaust air volume controlled by the general exhaust valve. The method of claim 5 or 6,
Further comprising a fourth step of changing the air supply air volume according to a preset schedule or an instruction from the outside,
The first step includes the step of determining the general exhaust air volume according to the air supply air volume changed in the fourth step. The method of claim 5 or 6,
Further comprising a fourth step of calculating the air supply air volume according to the load situation of the target room,
The first step comprises determining the general exhaust air volume according to the air supply air volume calculated in the fourth step.

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