JP2016020770A - Room pressure control system and room pressure control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable room pressure correction control by immediate switching of room negative/positive pressure and a small-diameter room pressure controlling valve.SOLUTION: A room pressure control system includes an air supply valve MAV, an exhaust valve GEX, a room pressure controlling valve PCV, and controllers 103 to 105. The controller 103 includes an air volume balance control part for controlling the air supply valve MAV and the exhaust valve GEX in such a manner that a difference between an air supply volume and an exhaust air volume coincides with an off-set air volume set value, and an off-set air volume set value switching part for switching the off-set air volume set value when receiving an instruction to switch a negative/positive pressure in a room 100 from the outside. The controller 105 includes a room pressure correction control part for controlling the room pressure controlling valve PCV in such a manner that a differential pressure between a reference room 110 and the room 100 coincides with a room pressure set value, and a room pressure set value switching part for switching the room pressure set value in linkage with switching of the off-set air volume set value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a room pressure control system that keeps a room pressure constant by controlling the supply air volume and exhaust air volume into a room, and more particularly, to a room pressure control system and a room pressure control method that correspond to the switching of the room's negative and positive pressures. It is.

  Conventionally, as a technology for switching between a positive pressure operation mode in which the ventilation target chamber is positive pressure and a negative pressure operation mode in which the ventilation target chamber is negative pressure, a ventilation device is used by switching operation of the supply / exhaust damper, inverter control of the supply / exhaust fan, etc. A technique has been proposed in which the operation mode is switched to display whether the ventilation device is in the positive pressure operation mode or the negative pressure operation mode at the entrance or exit of the ventilation target room (see Patent Document 1).

JP 2005-114317 A

  According to the technique disclosed in Patent Literature 1, the operation mode can be switched by operating a negative / positive pressure changeover switch provided inside the ventilation target room, for example, preventing entry of germs and dust into the room. It is possible to realize emergency operation mode switching that prevents leakage of pathogenic bacteria or the like. However, in the conventional technology, a small-diameter chamber pressure control valve is used to strictly control the chamber pressure. However, in order to cope with the switching between the positive and negative pressures, the air volume difference between the supply air and the exhaust gas is reversed. Therefore, there is a problem that the diameter of the valve for controlling the chamber pressure becomes large.

  The present invention has been made in order to solve the above-described problem, and a room pressure control system and a room pressure control method capable of instantaneously switching a room negative / positive pressure and a room pressure correction control using a small-diameter room pressure control valve. The purpose is to provide.

  The room pressure control system according to the present invention includes an air supply valve that adjusts an air volume of supply air blown to a target facility, an exhaust valve that adjusts an air volume of exhaust gas sucked from the target facility, and an air supply that is adjusted by the air supply valve. The air volume for controlling the air supply valve and the exhaust valve not used as the room pressure control valve so that the difference between the air volume and the exhaust air volume adjusted by the exhaust valve matches the offset air volume setting value. A chamber pressure control valve among the supply valve and the exhaust valve so that the differential pressure between the reference chamber set to the reference chamber pressure and the target facility matches the chamber pressure setting value, the balance control means A chamber pressure correction control means for controlling the valve to be operated as an off-switch for switching the offset air volume setting value when receiving an instruction to switch the positive / negative pressure of the target facility from the outside And Tsu DOO air volume setting value switching means, in conjunction with the switching of the offset air volume set value, is characterized in further comprising a chamber pressure setpoint switching means for switching the chamber pressure set value.

Moreover, in one configuration example of the room pressure control system of the present invention, the offset air volume setting value switching means converts the offset air volume setting value into an offset for positive pressure control when receiving a switching instruction from positive pressure to negative pressure. Switching from the air flow setting value to the offset air flow setting value for negative pressure control, when receiving a switching instruction from negative pressure to positive pressure, the offset air flow setting value is changed from the offset air flow setting value for negative pressure control to the Switching to the offset air volume setting value for positive pressure control, and when the room pressure setting value switching means receives a switching instruction from positive pressure to negative pressure, the chamber pressure setting value is changed to the room pressure for positive pressure control. When switching from the set value to the negative pressure control chamber pressure set value and receiving a switching instruction from the negative pressure to the positive pressure, the chamber pressure set value is changed from the negative pressure control chamber pressure set value to the positive pressure. It is characterized by switching to the room pressure set value for pressure control. It is an.
Also, one configuration example of the room pressure control system according to the present invention is that either one of the air supply flow rate and the exhaust air flow rate is used instead of operating one of the air supply valve and the exhaust valve as a chamber pressure control valve. A separate valve for controlling the room pressure for adjusting one of the two is provided, and the air volume balance control means is configured such that a difference between an air supply volume adjusted by the air supply valve and an exhaust air volume adjusted by the exhaust valve becomes an offset air volume setting value. The air supply valve and the exhaust valve are controlled so as to coincide with each other.

  Further, in the room pressure control method of the present invention, the difference between the supply air volume adjusted by the supply air valve installed in the target facility and the exhaust air volume adjusted by the exhaust valve installed in the target facility is the offset air volume setting. An air volume balance control step for controlling one of the air supply valve and the exhaust valve that is not used as a room pressure control valve so as to match the value, and a room pressure control between the air supply valve and the exhaust valve. A chamber pressure correction control step for controlling a valve to be operated as a valve for use so that a differential pressure between a reference chamber set to a reference chamber pressure and the target facility matches a chamber pressure setting value; An offset air volume setting value switching step of switching the offset air volume setting value when receiving an instruction to switch the yin and positive pressure of the target facility; and switching of the offset air volume setting value; And dynamic and is characterized in that it comprises a chamber pressure setpoint switching step of switching the chamber pressure set value.

  According to the present invention, one of the air supply valve and the exhaust valve is used as a room pressure control valve, and control is performed by switching the offset air volume setting value in conjunction with the switching of the room pressure setting value when switching the room negative / positive pressure. To do. In the present invention, the change in the air volume difference between the supply and exhaust due to the switching of the negative and positive pressures in the room is left to the valve that is not used as the room pressure control valve among the air supply valve and the exhaust valve, and the chamber pressure setting value is switched. Only the chamber pressure control valve performs the air volume switching and the chamber pressure correction control after the switching is completed. As a result, in the present invention, the room pressure correction control by the room pressure control valve having a small diameter and the room pressure can be controlled by suppressing the room pressure disturbance due to the room pressure switching. Moreover, in the present invention, the switching time of the negative / positive pressure in the room can be shortened by interlocking the switching of the offset air volume setting value with the switching of the room pressure setting value.

It is a figure which shows the structure of the room pressure control system which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the controller which controls the air supply valve which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the controller which controls the valve | bulb for room pressure control which concerns on embodiment of this invention. It is a flowchart explaining the air volume balance control operation | movement and room pressure correction | amendment control operation of the room pressure control system which concerns on embodiment of this invention. It is a flowchart explaining the negative / positive pressure switching operation | movement of the room pressure control system which concerns on embodiment of this invention. It is a figure which shows the mode of the air volume switching by switching of an offset air volume setting value and a room pressure setting value, and the switching of room pressure correction control.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a room pressure control system according to an embodiment of the present invention. The room pressure control system of the present embodiment includes an air supply duct 101 that supplies air to the room 100, an exhaust duct 102 that exhausts air in the room 100, and an air supply valve MAV that adjusts the air volume of the air supply duct 101. An exhaust valve GEX for adjusting the air volume of the exhaust duct 102, a chamber pressure control valve PCV provided in the air supply duct 101, a controller 103 for controlling the air supply valve MAV, and a controller 104 for controlling the exhaust valve GEX. A controller 105 that controls the chamber pressure control valve PCV, a communication line 106 that connects the controllers 103 to 105 to each other, a differential pressure sensor 107 that measures a pressure difference between the predetermined reference chamber 110 and the room 100, It comprises a positive / negative pressure switch 108 installed in the room 100.

  FIG. 2 is a block diagram showing a configuration of the controller 103 of the present embodiment. The controller 103 controls the supply air volume of the supply valve MAV and the exhaust valve so that the difference between the supply air volume adjusted by the supply valve MAV and the exhaust air volume adjusted by the exhaust valve GEX matches the offset air volume setting value. The flow rate balance control unit 1 that determines the exhaust air volume of the GEX and controls the supply valve MAV and the exhaust valve GEX, and the offset air volume setting value when receiving an instruction to switch the negative / positive pressure of the room 100 from the outside An offset air volume setting value switching unit 2 for switching is provided.

  FIG. 3 is a block diagram showing a configuration of the controller 105 of the present embodiment. The controller 105 includes a chamber pressure correction control unit 3 that controls the chamber pressure control valve PCV so that the inter-chamber differential pressure between the reference chamber 110 and the chamber 100 set to the reference chamber pressure matches the chamber pressure setting value; A room pressure set value switching unit 4 for switching the room pressure set value is provided in conjunction with the switching of the offset air volume set value.

  Next, the air volume balance control operation and the room pressure correction control operation of the room pressure control system of the present embodiment will be described. FIG. 4 is a flowchart for explaining the air volume balance control operation and the room pressure correction control operation. In the present embodiment, a case where the chamber pressure control valve PCV is arranged in the air supply duct 101 will be described. Let Vmav be the amount of air supplied by the air supply valve MAV, Vpcv be the amount of air supplied by the valve PCV for controlling the room pressure, and Vgex be the amount of air exhausted by the exhaust duct 102.

The air volume balance control unit 1 of the controller 103 determines the supply air volume Vmav and the exhaust air volume Vgex so that the difference between the supply air volume Vmav and the exhaust air volume Vgex matches the offset air volume setting value α (step S1 in FIG. 4). ).
Vmav = Vgex + α (1)
However, the air volume balance control unit 1 determines the supply air volume Vmav so as to always blow out at least the minimum air volume so as to satisfy the minimum ventilation air volume of the target facility (the room 100 in FIG. 1).

  The air volume balance control unit 1 controls the opening degree of the air supply valve MAV so that the air volume of the air supply adjusted by the air supply valve MAV becomes the air volume Vmav determined in step S1 (step S2 in FIG. 4). The air volume balance control unit 1 controls the opening degree of the exhaust valve GEX via the controller 104 so that the exhaust air volume adjusted by the exhaust valve GEX becomes the air volume Vgex determined in step S1 (step S3 in FIG. 4). .

On the other hand, the differential pressure sensor 107 measures the inter-room differential pressure between the reference chamber 110 and the room 100 set to the reference chamber pressure. The room pressure correction control unit 3 of the controller 105 determines the supply air amount Vpcv so that the inter-room differential pressure measured by the differential pressure sensor 107 matches the room pressure set value β (step S4 in FIG. 4). Then, the room pressure correction control unit 3 controls the opening degree of the chamber pressure control valve PCV so that the air volume of the supply air adjusted by the room pressure control valve PCV becomes the air volume Vpcv determined in step S4 (FIG. 4 step S5).
In this way, for example, until the air volume control is ended by an instruction from the user (YES in step S6 in FIG. 4), the processes of steps S1 to S5 are repeatedly performed for each control cycle.

  Next, the negative / positive pressure switching operation for switching the positive / negative pressure in the room 100 will be described. As an example of switching the negative / positive pressure in the room 100, for example, when an experiment is performed in the room 100 to handle a biochemical substance, the room 100 is normally set so that impurities such as bacteria and dust do not flow into the room 100. By making the pressure higher, the room pressure of the room 100 needs to be higher than that of the outside so that the differential pressure prevents the impurities from flowing into the room 100 and prevents the biochemical substances from leaking out of the room 100. There is an example in which the room pressure in the room 100 is made lower than the outside by setting the room 100 to a negative pressure, and leakage of biochemical substances from the room 100 is prevented by the differential pressure. In the present embodiment, the person in the room 100 operates the yin / yang pressure changeover switch 108, or the manager of the target facility operates the terminal (not shown) of the monitoring center, thereby reducing the yin / yang pressure in the room 100. It can be switched.

FIG. 5 is a flowchart illustrating the yin / yang pressure switching operation. The offset air volume setting value switching unit 2 of the controller 103 receives the instruction for switching the positive / negative pressure by operating the negative / positive pressure switching switch 108 or a terminal (not shown) (YES in step S10 in FIG. 5). Switching (step S11 in FIG. 5). As the offset air volume setting value α, the offset air volume setting value α1 for positive pressure control (for example, α1 = + 500 m ³ / h), the offset air volume setting value α2 for negative pressure control (α2 <α1, for example, α2 = −500 m ^3). / H) is prepared in advance.

  The air supply air volume Vmav during the daytime when there is a person in the room 100 and the air supply air volume Vmav during the nighttime when there is no person are set in advance for each of the positive pressure control and the negative pressure control. Has been. Therefore, the supply air volume Vmav for each time zone and each positive / negative pressure control is a known value, and the offset air volume setting value α is set for each of the positive pressure control and the negative pressure control in consideration of these known values. Just keep it. As described above, the exhaust air volume Vgex is determined so as to satisfy the expression (1) based on the supply air volume Vmav and the offset air volume setting value α.

  When the offset air volume setting value switching unit 2 receives a switching instruction from positive pressure to negative pressure by operating the negative / positive pressure switch 108 or the terminal, the offset air volume setting value α is changed from the offset air volume setting value α1 for positive pressure control. When switching to the offset air volume setting value α2 for negative pressure control and conversely receiving a switching instruction from negative pressure to positive pressure, the offset air volume setting value α is changed from the offset air volume setting value α2 for negative pressure control to the positive pressure. The control is switched to the control offset air volume setting value α1.

  On the other hand, the room pressure setting value switching unit 4 of the controller 105 switches the room pressure setting value β when receiving an instruction to switch the positive / negative pressure by operating the negative / positive pressure switch 108 or the terminal (step S12 in FIG. 5). As the chamber pressure set value β, a chamber pressure set value β1 for positive pressure control (for example, β1 = + 20 Pa) and a chamber pressure set value β2 for negative pressure control (β2 <β1, for example, β2 = −20 Pa) are prepared in advance. Has been.

When receiving a switching instruction from positive pressure to negative pressure by operating the negative / positive pressure switch 108 or the terminal, the room pressure set value switching unit 4 changes the room pressure set value β from the room pressure set value β1 for positive pressure control. When switching to the negative pressure control chamber pressure set value β2 and, on the contrary, receiving a switching instruction from the negative pressure to the positive pressure, the chamber pressure set value β is changed from the negative pressure control chamber pressure set value β2 to the positive pressure. Switch to the control chamber pressure set value β1.
The air volume balance control operation and the room pressure correction control operation after switching between the offset air volume setting value α and the room pressure setting value β are as described above.

  The chamber pressure control valve PCV needs to use a valve having a small diameter as much as possible in order to perform a fine control of the chamber pressure. Switching between the negative and positive pressures in the room 100 has a large change in the air volume difference between the supply air and the exhaust gas. Therefore, if the change is controlled only by the room pressure control valve PCV, the diameter of the room pressure control valve PCV becomes large. End up.

  Therefore, in the present embodiment, two offset air volume setting values α1 for positive pressure control and offset air volume setting value α2 for negative pressure control are provided, and the room pressure is set when the negative pressure is switched in the room 100. In conjunction with the switching of the value β, the offset air volume setting value α is also switched to perform control. As a result, the change in the air volume difference between the supply and exhaust air due to the switching of the negative and positive pressures in the room 100 is left to the air supply valve MAV and the exhaust valve GEX. Only the control can be performed by the chamber pressure control valve PCV. Thus, in the present embodiment, it is possible to immediately switch the negative / positive pressure in the room 100 and to control the room pressure correction by the small-diameter room pressure control valve PCV, and to suppress the disturbance of the room pressure due to the negative / positive pressure switch in the room 100. Can do. Moreover, the switching time of the negative / positive pressure of the room 100 can be shortened by interlocking the switching of the offset air volume setting value α with the switching of the room pressure setting value β.

FIG. 6 shows how air volume switching and room pressure correction control are switched by switching between the offset air volume setting value α and the room pressure setting value β. At the time of positive pressure setting, as described above, the offset air volume setting value α = α1 = + 500 m ³ / h, the chamber pressure setting value β = β1 = + 20 Pa, and the room pressure centered on the offset air volume setting value α = α1 = + 500 m ³ / h. Air volume correction control of ± 200 m ³ / h for maintenance is performed by the room pressure control valve PCV. Similarly, when the negative pressure is set, the offset air volume setting value α = α2 = −500 m ³ / h, the chamber pressure setting value β = β2 = −20 Pa, and the offset air volume setting value α = α2 = −500 m ³ / h. The air volume correction control of ± 200 m ³ / h for maintaining the room pressure is performed by the room pressure control valve PCV.

  In the present embodiment, the chamber pressure control valve PCV is disposed in the air supply duct 101, but may be disposed in the exhaust duct 102. In this case, Vpcv is the exhaust air volume adjusted by the chamber pressure control valve PCV.

  Further, any one of the supply valve MAV and the exhaust valve GEX may be used as the chamber pressure control valve PCV. In this case, if the air supply valve MAV is the room pressure control valve PCV, the air supply air volume Vmav = Vpcv is determined by the control by the room pressure correction control unit 3, and therefore the air volume balance control unit 1 satisfies the equation (1). Thus, the exhaust air volume Vgex is determined, and the exhaust valve GEX that is not used as the chamber pressure control valve PCV is controlled. Similarly, if the exhaust valve GEX is the room pressure control valve PCV, the exhaust air volume Vgex = Vpcv is determined by the control by the room pressure correction control section 3, so that the air volume balance control section 1 satisfies the equation (1). The supply air volume Vmav is determined, and the supply valve MAV that is not used as the chamber pressure control valve PCV is controlled.

  Each of the controllers 103 to 105 described in the present embodiment can be realized by, for example, a computer having a CPU (Central Processing Unit), a storage device, and an interface, and a program for controlling these hardware resources. The CPUs of the controllers 103 to 105 execute the processing described in the present embodiment in accordance with programs stored in the storage devices of the controllers.

  The present invention can be applied to a room pressure control system.

  DESCRIPTION OF SYMBOLS 1 ... Air volume balance control part, 2 ... Offset air volume setting value switching part, 3 ... Room pressure correction control part, 4 ... Room pressure setting value switching part, 100 ... Room, 101 ... Supply duct, 102 ... Exhaust duct, 103- DESCRIPTION OF SYMBOLS 105 ... Controller, 106 ... Communication line, 107 ... Differential pressure sensor, 108 ... Negative / positive pressure changeover switch, 110 ... Reference | standard chamber, MAV ... Supply valve, GEX ... Exhaust valve, PCV ... Valve for room pressure control.

Claims (6)

An air supply valve that adjusts the amount of air supplied to the target facility;
An exhaust valve for adjusting the amount of exhaust air sucked out from the target facility;
A valve for controlling a room pressure of the air supply valve and the exhaust valve so that a difference between an air supply amount adjusted by the air supply valve and an exhaust air amount adjusted by the exhaust valve matches an offset air amount setting value. Air volume balance control means for controlling the valve not used as
One of the supply valve and the exhaust valve that is operated as a chamber pressure control valve so that the differential pressure between the reference chamber set to the reference chamber pressure and the target facility matches the chamber pressure setting value. Chamber pressure correction control means for controlling the valve;
Offset air volume setting value switching means for switching the offset air volume setting value when receiving an instruction to switch the positive / negative pressure of the target facility from the outside,
A room pressure control system comprising room pressure set value switching means for switching the chamber pressure set value in conjunction with switching of the offset air volume set value. The room pressure control system according to claim 1,
When the offset air volume setting value switching means receives a switching instruction from positive pressure to negative pressure, the offset air volume setting value is changed from the offset air volume setting value for positive pressure control to the offset air volume setting value for negative pressure control. Switching, when receiving a switching instruction from negative pressure to positive pressure, the offset air volume setting value is switched from the offset air volume setting value for the negative pressure control to the offset air volume setting value for the positive pressure control,
When the chamber pressure set value switching means receives a switching instruction from positive pressure to negative pressure, the chamber pressure set value is changed from the chamber pressure set value for positive pressure control to the chamber pressure set value for negative pressure control. And switching the chamber pressure setting value from the chamber pressure setting value for the negative pressure control to the chamber pressure setting value for the positive pressure control when receiving a switching instruction from the negative pressure to the positive pressure. Characteristic room pressure control system. The room pressure control system according to claim 1 or 2,
Instead of operating either the supply valve or the exhaust valve as a chamber pressure control valve, a separate chamber pressure control valve for adjusting either the supply air amount or the exhaust air amount is provided.
The air volume balance control means includes the air supply valve and the exhaust valve so that a difference between an air supply air volume adjusted by the air supply valve and an exhaust air volume adjusted by the exhaust valve matches an offset air volume setting value. And a room pressure control system. The air supply valve so that a difference between an air supply amount adjusted by an air supply valve installed in a target facility and an exhaust air amount adjusted by an exhaust valve installed in the target facility matches an offset air amount setting value. And an air volume balance control step for controlling a valve not used as a chamber pressure control valve among the exhaust valves,
Of the air supply valve and the exhaust valve, the one that operates as a chamber pressure control valve is controlled, and the differential pressure between the reference chamber set as the reference chamber pressure and the target facility is set to the chamber pressure setting value. A chamber pressure correction control step to match
An offset air volume setting value switching step for switching the offset air volume setting value when receiving an instruction to switch the yin and yang pressure of the target facility from the outside;
A chamber pressure setting value switching step of switching the chamber pressure setting value in conjunction with the switching of the offset air volume setting value. In the room pressure control method according to claim 4,
The offset air volume setting value switching step changes the offset air volume setting value from an offset air volume setting value for positive pressure control to an offset air volume setting value for negative pressure control when receiving an instruction to switch from positive pressure to negative pressure. Switching, when receiving a switching instruction from negative pressure to positive pressure, the offset air volume setting value is switched from the offset air volume setting value for the negative pressure control to the offset air volume setting value for the positive pressure control,
The chamber pressure setting value switching step changes the chamber pressure setting value from a chamber pressure setting value for positive pressure control to a chamber pressure setting value for negative pressure control when receiving a switching instruction from positive pressure to negative pressure. And switching the chamber pressure setting value from the chamber pressure setting value for the negative pressure control to the chamber pressure setting value for the positive pressure control when receiving a switching instruction from the negative pressure to the positive pressure. A characteristic room pressure control method. In the room pressure control method according to claim 4 or 5,
Instead of operating either the supply valve or the exhaust valve as a chamber pressure control valve, a separate chamber pressure control valve for adjusting either the supply air amount or the exhaust air amount is provided.
In the air volume balance control step, the air supply valve and the exhaust valve are adjusted such that a difference between an air supply air volume adjusted by the air supply valve and an exhaust air volume adjusted by the exhaust valve matches an offset air volume setting value. The room pressure control method characterized by controlling.

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