Room pressure controller and program

Abstract

To improve stability of room pressure.SOLUTION: A room pressure controller comprises air supply means for supplying air to a target room, exhaust means for exhausting air from the target room, and a room pressure control damper that is arranged between the target room and the exhaust means and adjusts a room pressure of the target room. The room pressure controller further comprises detection means for detecting the room pressure of the target room, and control means for controlling the room pressure control damper by simple adaptive control based on a set room pressure of the target room and a detection result of the detection means so that the target room is maintained at the set room pressure.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a room pressure control technique. [Background technology]

[0002] It is required to maintain the room pressure at a predetermined pressure in pharmaceutical manufacturing rooms, clean rooms, etc. It has been proposed to control the room pressure by using a room pressure control damper (pressure controlled damper: PCD) or the like (Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-83475 [Patent Document 2] Patent Publication No. 2021-46954 [Patent Document 3] Patent No. 7145275 Summary of the Invention [Problem to be solved by the invention]

[0004] The room pressure may be disturbed by fluctuations in the external air pressure (fluctuations in outdoor wind pressure). Even if a room pressure control damper is installed, it may be affected by large disturbances, and improvement in this regard is desired.

[0005] An object of the present invention is to improve the stability of the chamber pressure. [Means for solving the problem]

[0006] According to the present invention, An air supply means for supplying air to the target room; An exhaust means for exhausting air from the target chamber; a chamber pressure control damper provided between the target chamber and the exhaust means and configured to adjust the chamber pressure of the target chamber; A room pressure control device comprising: A detection means for detecting a pressure in the target chamber; and a control means for controlling the room pressure control damper by simple adaptive control based on the set room pressure of the target room and the detection result of the detection means so that the target room is maintained at the set room pressure. A room pressure control device is provided. Effect of the Invention

[0007] According to the present invention, the stability of the chamber pressure can be improved. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a room pressure control device according to one embodiment of the present invention; [Diagram 2] FIG. 4A is a block diagram of a control unit, and FIG. 4B is a flowchart showing an example of processing executed by the control unit. [Diagram 3] Block diagram of the control of the room pressure control damper. [Figure 4] FIG. 1 is a diagram showing an example of a reference model. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the multiple features described in the embodiments may be arbitrarily combined. In addition, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0010] <Outline of the device> FIG. 1 is a schematic diagram of a room pressure control device 1 according to an embodiment of the present invention. The room pressure control device 1 is a ventilation device that ventilates adjacent target rooms 101 to 103 while maintaining the room pressures of the rooms at a predetermined room pressure. The target rooms 101 and 103 communicate with each other when a door 111 is opened, and are cut off when the door is closed. The target rooms 101 and 102 communicate with each other when a door 112 is opened, and are cut off when the door is closed. The target rooms 102 and 103 communicate with each other when a door 113 is opened, and are cut off when the door is closed. The target room 103 communicates with the outside when a door 114 is opened, and is cut off when the door is closed. The target rooms 101 to 103 are, for example, pharmaceutical manufacturing rooms, food processing rooms, bacteriological laboratories, clean rooms, etc. In this embodiment, the target rooms 101 to 103 are maintained at a room pressure higher than atmospheric pressure, for example, several tens of Pa.

[0011] The room pressure control device 1 includes an air supply unit 2. The air supply unit 2 is, for example, a fan. The air supply unit 2 takes in outside air via an air volume control damper VD1, and supplies the air to a target room via air supply ducts 10-13. The air supply duct 10 is provided with a pressure sensor 4 that detects the pressure inside the duct. The air supply unit 2 can adjust the pressure inside the air supply duct 10 on the discharge side based on the detection result of the pressure sensor 4.

[0012] Air supply ducts 11-13 branch off from air supply duct 10 and are connected to the corresponding target rooms 101-103. Air supply duct 11 is connected to target room 101 and forms an air passage for air to be supplied to target room 101. Air supply duct 11 is provided with a constant air volume device 41, which adjusts the amount of air supplied to target room 101 to a constant amount. Air supply duct 12 is connected to target room 102 and forms an air passage for air to be supplied to target room 102. Air supply duct 12 is provided with a constant air volume device 42, which adjusts the amount of air supplied to target room 102 to a constant amount. Air supply duct 13 is connected to target room 103 and forms an air passage for air to be supplied to target room 103. Air supply duct 13 is provided with a constant air volume device 43, which adjusts the amount of air supplied to target room 103 to a constant amount.

[0013] The room pressure control device 1 includes an exhaust unit 3. The exhaust unit 3 is, for example, a fan. The exhaust unit 3 exhausts air from the target rooms 101-103 to the outside (atmosphere) via exhaust ducts 20-23 and an air volume control damper VD2. The exhaust duct 20 is provided with a pressure sensor 5 that detects the pressure inside the duct. The exhaust unit 3 can adjust the pressure inside the exhaust duct 20 on the suction side based on the detection result of the pressure sensor 5.

[0014] Exhaust ducts 21-23 branch off from exhaust duct 20 and are connected to the corresponding target rooms 101-103. Exhaust duct 21 is connected to target room 101 and forms an air passage for air exhausted from target room 101. Exhaust duct 21 is provided with a room pressure control damper 51. Room pressure control damper 51 is provided between exhaust unit 3 and target room 101, and is a pressure control damper that adjusts the room pressure of target room 101.

[0015] The exhaust duct 22 is connected to the target room 102 and forms a wind path for the air exhausted from the target room 102. A room pressure control damper 52 is provided in the exhaust duct 22. The room pressure control damper 52 is provided between the exhaust unit 3 and the target room 102 and is a pressure control damper that adjusts the room pressure of the target room 102. The exhaust duct 23 is connected to the target room 103 and forms a wind path for the air exhausted from the target room 103. A room pressure control damper 53 is provided in the exhaust duct 23. The room pressure control damper 53 is provided between the exhaust unit 3 and the target room 103 and is a pressure control damper that adjusts the room pressure of the target room 103.

[0016] The room pressure control dampers 51-53 include, for example, a motor as a drive source, and an opening / closing member that is driven by the motor to open and close the air passage. By controlling the opening degree of the opening / closing member, the room pressure of the corresponding target rooms 101-103 can be adjusted. The room pressure of the target room 101 is detected by a room pressure detection sensor 61, the room pressure of the target room 102 is detected by a room pressure detection sensor 62, and the room pressure of the target room 103 is detected by a room pressure detection sensor 63. By controlling the opening degree of the room pressure control dampers 51-53 based on the detection results of the room pressure detection sensors 61-63, the room pressure of the target rooms 101-103 can be controlled more accurately.

[0017] A circulation duct 30 is provided between the air supply unit 2 and the exhaust unit 3. The circulation duct 30 returns a portion of the air exhausted from the exhaust unit 3 to the air supply unit 2. This allows the air in the target rooms 101-103 to circulate. An air volume adjustment damper VD3 is provided in the circulation duct 30, and the amount of air circulation can be adjusted by the air volume adjustment damper VD3. The ratio of outside air introduced into the target rooms 101-103 and circulated air can be adjusted by the air volume adjustment dampers VD1-VD3.

[0018] The room pressure control device 1 may include a filter device or an air purifier that purifies the air to be supplied to the target rooms 101 to 103, and a temperature regulator that adjusts the temperature of the air.

[0019] The room pressure control device 1 is equipped with a control unit 7 that controls the entire device. Fig. 2(A) is a block diagram of the control unit 7. The control unit 7 is an electronic circuit including a processing unit 71, a memory unit 72, and an interface unit (I / F unit) 73. The processing unit 71 is a processor represented by a CPU, and executes programs stored in the memory unit 72. The memory unit 72 is a storage device such as a RAM, a ROM, or a hard disk. The I / F unit 73 includes an input interface to which the detection results of the sensor 75 and the input contents of the input device 76 are input, and an output interface to output control instructions to the actuator 74, display information to the display device 77, etc.

[0020] The sensors 75 include various sensors equipped in the room pressure control device 1, such as the pressure sensors 4 and 5 and the room pressure detection sensors 61-63. The actuators 74 include various actuators equipped in the room pressure control device 1, such as the fans 2 and 3, the constant air volume devices 41-43, and the room pressure control dampers 51-53. The input device 76 is a device that accepts input from an operator, and may be, for example, a keyboard, a mouse, or a touch panel type device. The display device 77 is a device that presents information such as the operating state of the room pressure control device 1 to the operator.

[0021] <Control example> A control example of the control unit 7 will be described. Here, a control example of the room pressure control dampers 51-53 executed by the processing unit 71 will be described. Fig. 2(B) is a flowchart showing a control example of the room pressure control dampers 51-53, and shows an example of processing from starting up to maintaining the room pressure.

[0022] In step S1, the set room pressure of each of the target rooms 101-103 is acquired. In this embodiment, the room pressure is set for each of the target rooms 101-103. Each room pressure value is input in advance by, for example, an operator via the input device 76, and the input room pressure value is stored in the memory unit 72 in association with the corresponding target rooms 101-103. In step S1, for example, the processing unit 71 reads out the set room pressure of each of the target rooms 101-103 from the memory unit 72.

[0023] In step S2, the detection results of the room pressure detection sensors 61 to 63 are acquired. In step S3, based on the set room pressure acquired in step S1 and the detection results acquired in step S2, the control amounts of the room pressure control dampers 51 to 53 are calculated so that the target rooms 101 to 103 are maintained at the corresponding set room pressures.

[0024] In step S4, the control variables calculated in step S3 are applied to the corresponding room pressure control dampers 51-53 to drive them. In step S5, it is determined whether or not a control termination condition is met. The termination condition is, for example, when an operator gives an instruction. If it is determined that the termination condition is not met, the process returns to step S2 and the same processing is repeated. Through the above control, the room pressure in each of the target rooms 101-103 rises, for example, from an initial room pressure (e.g., atmospheric pressure) to a set room pressure, and is then maintained at the set room pressure.

[0025] <Room pressure control damper control method> The room pressure in the target rooms 101-103 may be disturbed by pressure fluctuations in the external air (fluctuations in outdoor wind pressure). As a control method for the room pressure control dampers 51-53, for example, feedback control using PID control or PI control can be considered, but there is room for improvement in terms of reducing pressure fluctuations in the high frequency range, for example. In this embodiment, the stability of the room pressure is improved by controlling the room pressure control dampers 51-53 using simple adaptive control (SAC).

[0026] 3 is a block diagram of the control of the room pressure control dampers 51 to 53. In this embodiment, a control is performed by combining simple adaptive control with PI control. For convenience, the contents of the block diagram will be explained below by taking the room pressure control damper 51 as an example, but the same applies to the room pressure control dampers 52 and 53.

[0027] um(t) is the set pressure of the target chamber 101 at time t. In this embodiment, the set pressure is a constant value (e.g., several tens of Pa) regardless of time. The reference model application unit 80 applies um(t) to the reference model to calculate a target control value ym(t) according to the reference model. In the illustrated example, the reference model application unit 80 has a transfer function Gm(s).

[0028] If the transfer function Gm(s) is a first-order lag system, the target value ym(t) is calculated by the following formula. ym(t)=C Xm(t) Xm(t)=(Xm(t-1)+B·U·Δt) / (1.0-A·Δt) Here, U is the set pressure (however, the value after range conversion between 0 and 1), A to C are coefficients that define the rate at which the room pressure rises, Δt is the control period, and Xm(t-1): the value of Xm one control period before.

[0029] FIG. 4 shows examples of reference models for the target rooms 101 to 103. Reference model M1 corresponds to the target room 101, reference model M2 corresponds to the target room 102, and reference model M3 corresponds to the target room 103. Here, it is assumed that the set room pressures of the target rooms 101 to 103 have the relationship of target room 101<target room 102<target room 103. The reference model M3 corresponding to the target room 103, which has a relatively high set room pressure, has the fastest room pressure rise at the start of control, and the reference model M1 corresponding to the target room 101, which has a relatively low set room pressure, has the slowest room pressure rise. The rise speed can be adjusted by the coefficients A to C as described above.

[0030] By setting the reference models M1 to M3 in this way, it is possible to prevent the high / low relationship of the room pressures among the target rooms 101 to 103 from being reversed in the middle of the rise of the room pressures.

[0031] Returning to Fig. 3, the deviation calculation unit 85 calculates the deviation e(t) between the target value ym(t) and the room pressure y(t) of the target room 101. The room pressure y(t) of the target room 101 is the detection result of the room pressure detection sensor 61.

[0032] The feedforward control unit 81 calculates a control value (=um(t)·kum(t)) corresponding to the set chamber pressure um(t). The gain kum(t) is calculated by the following equation. kum(t) = (θps2(t) + θie2(t)) θps2(t)=-1.0·γps2·U·Es(t) θis2(t)=θis2(t-1)-1.0·γis2·U·Es(t)·Δt Es(t)=PV-ym(t) Here, PV is the room pressure detection result (detection result of the sensor 61), and γps2 and γis2 are adjustment parameters.

[0033] The feedforward control unit 82 calculates a control value (=Xm(t)·kxm(t)) according to the state variable Xm(t) calculated by the reference model application unit 80. The gain kxm(t) is calculated by the following equation. kxm(t) = (θps1(t) + θie1(t)) θps1(t)=-1.0·γps1·Xm(t)·Es(t) θis1(t)=θis1(t-1)-1.0·γis1·Xm(t)·Es(t)·Δt Here, γps1 and γis1 are adjustment parameters.

[0034] The feedback control unit 83 calculates a control value (=e(t)·ke(t)) corresponding to the deviation e(t). The gain ke(t) is calculated by the following equation. ke(t)=-(γpe+γie·Δt) Here, γpe and γie are adjustment parameters.

[0035] The PI control unit 84 calculates a control value (=Kp·e(t)·+Ki·∫e(t)dt) according to the deviation e(t), where the proportional gain Kp and integral gain Ki are adjustment parameters.

[0036] The control value calculation unit 86 adds up the control values ​​of the feedforward control units 81 and 82, the feedback control unit 83, and the PI control unit 84 to calculate a control value u(t) for the room pressure control damper 51. The room pressure control damper 51 is driven by the control value u(t), and the room pressure of the target room 101, which is the controlled object 87, becomes y(t). The controlled object 87 is represented by a transfer function G(s) of the change in room pressure in the target room 101 relative to the control value u(t).

[0037] By the above control method, the control values ​​of the room pressure control dampers 51-53 are calculated in S3 in Fig. 2(B). By controlling the room pressure control dampers 51-53 by simple adaptive control, the control responsiveness is improved and pressure fluctuations in the high frequency range can be effectively reduced. By using PI control in combination, pressure fluctuations in the low frequency range can also be effectively reduced.

[0038] <Other embodiments> In the above embodiment, the PI control unit 84 is used, but it may be a PID control unit. The PID control unit calculates a control value (=deviation e(t)·Kp+Ki·∫e(t)dt+Kv·e(t) / dt) according to the deviation e(t) (Kv is a differential gain). Alternatively, the PI control unit 84 may be a PD control unit, or the PI control unit 84 may be eliminated.

[0039] In the above embodiment, the pressure control of the three target chambers 101 to 103 is exemplified, but the number of target chambers may be one, two, or four or more.

[0040] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention. [Explanation of symbols]

[0041] 1 room pressure control device, 2 air supply unit, 3 exhaust unit, 7 control unit, 51-53 room pressure control dampers, 61-63 room pressure detection sensors

Claims

1. An air supply means for supplying air to the target room; An exhaust means for exhausting air from the target chamber; a chamber pressure control damper provided between the target chamber and the exhaust means and configured to adjust the chamber pressure of the target chamber; A room pressure control device comprising: A detection means for detecting a pressure in the target chamber; and a control means for controlling the room pressure control damper by simple adaptive control based on the set room pressure of the target room and the detection result of the detection means so that the target room is maintained at the set room pressure. A room pressure control device characterized by:

2. The room pressure control device according to claim 1, The room pressure control device controls the room pressures of a plurality of adjacent target rooms, The detection means and the room pressure control damper are provided for each of the target rooms, The reference model of the simple adaptive control is set for each of the target rooms. A room pressure control device characterized by:

3. The room pressure control device according to claim 2, The set chamber pressures of the plurality of target chambers are different from each other, The reference model corresponding to the target room in which the set room pressure is relatively high has a faster rise in room pressure at the start of control than the reference model corresponding to the target room in which the set room pressure is relatively low. A room pressure control device characterized by:

4. The room pressure control device according to claim 1, The control means a reference model application unit that calculates a target value according to the reference model; A first feedforward control unit that calculates a first control value according to the set chamber pressure; a second feedforward control unit that calculates a second control value according to the state variable calculated by the reference model application unit; a feedback calculation unit that calculates a third control value according to a deviation between the target value and the detection result of the detection means; A PI control unit that calculates a fourth control value according to the deviation; A control value calculation unit that calculates a control value of the room pressure control damper by adding up the first to fourth control values. A room pressure control device characterized by:

5. a computer that controls an apparatus including an air supply means for supplying air to a target room, an exhaust means for exhausting air from the target room, a room pressure control damper that is provided between the target room and the exhaust means and adjusts the room pressure of the target room, and a detection means that detects the room pressure of the target room; a control means for controlling the room pressure control damper by simple adaptive control based on a set room pressure of the target room and a detection result of the detection means so that the target room is maintained at the set room pressure; A program that functions as a

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