JP6214383B2 - Air conditioning operation mode change system - Google Patents

Description

  In the present invention, a circulation air-conditioning operation for circulating a predetermined amount of air to the air-conditioning chamber using the bypass duct while supplying a predetermined amount of outside air from the air-supply duct to the air-conditioning chamber and a stopped air-conditioning apparatus are started. The present invention relates to an air-conditioning operation mode change system that performs all-out-air operation in which circulation air-conditioning operation is stopped and only outside air is supplied from the supply air duct to the air-conditioning room, and switching operation for switching from all-outside air operation to circulation air-conditioning operation.

  An air supply duct that is provided with an air conditioner and a motor damper to supply outside air to the air conditioning room, an exhaust duct that is provided with an exhaust fan and a motor damper to exhaust air from the air conditioning room to the outside, and an air supply fan And a motor damper and a bypass duct connected to the air supply duct and the exhaust duct, and with the motor damper of the bypass duct closed, exhaust air is supplied to the air conditioning room by the air supply duct With all the outside air operation that exhausts the air in the air-conditioning room to the outside by the duct, the motor damper of the air supply duct and the motor damper of the exhaust duct are closed and the motor damper of the bypass duct is opened, An air-conditioning operation system that performs a circulation operation for circulating fumigation gas to an air-conditioning chamber is disclosed (see Patent Document 1).

JP 2001-178785 A

  The air-conditioning operation system disclosed in Patent Document 1 does not have means for maintaining the indoor air pressure of the air-conditioned room at the target room pressure during all-out-air operation or circulation operation. In addition to being unable to hold, the air pressure in the air-conditioning room may greatly increase or decrease during switching operation from all-outside air operation to circulation operation or during switching operation from circulation operation to all-outside air operation. If the air pressure in the air conditioning room fluctuates greatly during the switching operation, the pressure difference between the air pressure in the air conditioning room and the outside air pressure will become larger than necessary, and a large amount of outside air and air in the adjacent space will inadvertently enter the air conditioning room. In some cases, the air conditioner is contaminated by the invading outside air or the air in the adjacent space.

  An object of the present invention is to provide an air-conditioning operation mode change system that can prevent a large fluctuation in the indoor air pressure of an air-conditioning room during a switching operation from all outside air operation to circulation operation. Another object of the present invention is that the pressure difference between the air conditioning room and the outside air pressure does not become larger than necessary during the switching operation from the full outside air operation to the circulation operation, and a large amount of outside air to the air conditioning room during the switching operation. Another object of the present invention is to provide an air-conditioning operation mode changing system that can prevent inadvertent intrusion of air in an adjacent space and prevent contamination of the air-conditioned room due to invaded outside air or air in the adjacent space.

  The premise of the present invention for solving the above problems is an air conditioner installed in an air supply duct for supplying air to an air conditioned room, an exhaust apparatus installed in an exhaust duct for exhausting air from the air conditioned room, and air conditioning A bypass duct connecting an air supply duct extending upstream of the apparatus and an exhaust duct extending downstream of the exhaust apparatus, a first damper installed in the bypass duct, a pressure sensor for measuring the indoor pressure in the air-conditioning chamber, A controller for controlling the opening / closing operation of the opening / closing mechanism of the first damper, and circulating a predetermined amount of air to the air conditioning chamber using the bypass duct while supplying a predetermined amount of outside air from the air supply duct to the air conditioning chamber This is an air-conditioning operation mode change system that performs air-conditioning operation and all-outside air operation in which the open / close mechanism of the first damper is fully closed to circulate air-conditioning operation and only the outside air is supplied from the supply duct to the air-conditioning chamber.

  The feature of the present invention based on the above premise includes a switching operation in which the air-conditioning operation mode change system switches from the all-outside air operation to the circulation air-conditioning operation while maintaining the indoor air pressure of the air-conditioning room at the target room pressure. The opening operation means for gradually opening the opening and closing mechanism of the first damper in the state, and the interior of the air conditioning chamber measured by the pressure sensor from the start of the opening operation means until the opening and closing mechanism of the first damper reaches a predetermined opening degree When the atmospheric pressure exceeds the upper limit value of the target chamber pressure, or when the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the opening operation means is interrupted and the first damper at that time Air-conditioning chamber measured by the pressure sensor while the opening degree of the first damper is maintained by the opening degree first maintaining means. The indoor pressure of If the standard chamber pressure falls below the upper limit value, or if the air pressure in the air-conditioned room measured by the pressure sensor exceeds the lower limit value of the target chamber pressure, the first opening maintaining means is interrupted and the opening operation means is turned on again. There is to do. The period until the opening / closing mechanism of the first damper reaches a predetermined opening refers to the period until the opening / closing mechanism of the first damper reaches a certain opening of 40% or more from the fully closed state, or the opening / closing mechanism is fully closed. It is until it becomes fully open from the state.

  As an example of the present invention, the time required for the first damper opening / closing mechanism to be fully closed to fully opened is in the range of 60 to 600 seconds, and the controller in the opening operation means measures the atmospheric pressure of the air conditioning chamber measured by the pressure sensor. When the change is slow, an opening / closing speed first changing means for increasing the opening speed of the opening / closing mechanism of the first damper and slowing down the opening speed of the opening / closing mechanism of the first damper when the change in the indoor air pressure of the air conditioning chamber is abrupt. Do.

  As another example of the present invention, the air-conditioning operation mode changing system includes a second damper installed in an air supply duct extending upstream of the air conditioner and a third damper installed in an exhaust duct, In the all outside air operation and the switching operation, the opening degree of the opening / closing mechanism of the second and third dampers is maintained at 40 to 60%.

  As another example of the present invention, the air conditioning operation mode changing system includes a second damper installed in an air supply duct extending upstream of an air conditioner and a third damper installed in an exhaust duct. Is a closing operation means for gradually closing the opening and closing mechanisms of the second and third dampers in the open state to a predetermined opening, and from the start of the opening operation means until the opening and closing mechanism of the first damper reaches a predetermined opening. When the indoor air pressure of the air-conditioned room measured by the pressure sensor exceeds the upper limit value of the target room pressure between the start of the closing operation means and the opening mechanism of the second and third dampers reaching a predetermined opening degree, Alternatively, when the air pressure in the air-conditioned room measured by the pressure sensor falls below the lower limit value of the target room pressure, the closing operation means is interrupted and the opening of the opening mechanisms of the second and third dampers at that time is maintained. Second maintenance hand While the opening degree of the opening mechanism of the second and third dampers is maintained by the opening degree second maintaining means, the indoor air pressure of the air-conditioned room measured by the pressure sensor falls below the upper limit value of the target room pressure. If the air pressure in the air-conditioned room measured by the pressure sensor exceeds the lower limit value of the target room pressure, the opening degree second maintaining means is interrupted and the closing operation means is performed again.

  As another example of the present invention, in the opening degree first maintaining means, the air conditioning chamber measured by the pressure sensor between the start of the closing operation means and the opening mechanism of the second and third dampers reaches a predetermined opening degree. If the indoor air pressure exceeds the upper limit value of the target chamber pressure, or if the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the opening operation means is interrupted and the The opening degree of the opening / closing mechanism of 1 damper is maintained.

  As another example of the present invention, the time required for the second and third damper opening / closing mechanisms to be fully closed to fully open is in the range of 60 to 600 seconds, and the controller in the closing operation means uses the air conditioning measured by the pressure sensor. When the change in the indoor air pressure of the chamber is slow, the closing speed of the opening and closing mechanisms of the second and third dampers is increased, and when the change of the indoor air pressure of the air conditioning room is abrupt, the opening and closing mechanisms of the second and third dampers are closed. The opening / closing speed second changing means for reducing the speed is performed.

  As another example of the present invention, the opening degree of the open / close mechanism of the second and third dampers is maintained fully open in the full outside air operation, and the open / close mechanism of the second and third dampers in the fully open state is maintained in the closing operation means. Close the opening to 40-60%.

  As another example of the present invention, the air-conditioning room is a clean room, and in the air-conditioning operation mode change system, the clean room is filled with chemicals such as formalin and hydrogen peroxide after the air-conditioning apparatus is stopped and before the air-conditioning apparatus is started. System maintenance is performed between fumigation or after the air conditioner is stopped and before the air conditioner is started.After the fumigation or after maintenance, all outside air operation is performed, and switching operation is performed after all outside air operation. Done.

  According to the air-conditioning operation mode changing system according to the present invention, the air pressure in the air-conditioning room greatly increases during execution of the opening operation means that gradually opens the opening / closing mechanism of the first damper in the fully closed state, In some cases, the indoor pressure in the air-conditioning chamber measured by the pressure sensor between the start of the opening operation means and the opening / closing mechanism of the first damper reaches a predetermined opening degree in the switching operation may decrease. When the upper limit value of the chamber pressure is exceeded, or when the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the opening operation means is interrupted and the first damper opening / closing mechanism at that time Since the opening degree first maintaining means for maintaining the opening degree of the first damper is performed and the opening operation of the opening / closing mechanism of the first damper is stopped, even if the indoor air pressure in the air-conditioned room exceeds the upper limit value of the target room pressure during the switching operation , Against the upper limit of the target chamber pressure The internal air pressure can be quickly lowered, and even if the air pressure in the air-conditioned room falls below the lower limit value of the target room pressure during the switching operation, the indoor air pressure can be quickly raised above the lower limit value of the target room pressure. Can do. Since the air-conditioning operation mode change system can prevent deviation of the target room pressure of the air-conditioning room from the upper limit value and the lower limit value during the switching operation, the air-conditioning room during the switching operation from the all-outside air operation to the circulation air-conditioning operation. The indoor air pressure of the air-conditioned room measured by the pressure sensor while the opening degree of the first damper is maintained by the opening degree first maintaining means can be prevented. When the pressure falls below the upper limit value, or when the air pressure in the air-conditioned room measured by the pressure sensor exceeds the lower limit value of the target room pressure, the opening first maintaining means is interrupted and the opening operation means is restarted. Since the opening / closing mechanism of the first damper is gradually opened, it is possible to quickly switch from the all-outside air operation to the circulation air-conditioning operation while maintaining the indoor air pressure of the air-conditioning chamber within the range between the upper limit value and the lower limit value of the target chamber pressure. it can. In the air conditioning operation mode change system, the pressure difference between the indoor air pressure and the external air pressure in the air conditioning room does not become larger than necessary during the switching operation, and a large amount of outside air and air in the adjacent space inadvertently enter the air conditioning room. It is possible to prevent the contamination of the air-conditioning room by the invading outside air or the air in the adjacent space.

  When the change in the indoor air pressure of the air conditioning room measured by the pressure sensor is slow, the opening speed of the opening / closing mechanism of the first damper is increased, and when the change of the indoor air pressure in the air conditioning room is abrupt, the opening / closing mechanism of the first damper is opened. The air-conditioning operation mode changing system that performs the first changing means of the opening / closing speed for decreasing the speed increases the opening speed of the opening / closing mechanism of the first damper when the change in the indoor air pressure in the air-conditioning room is moderate. Since the opening speed of the opening / closing mechanism of the first damper is slowed when the change in the indoor air pressure in the air conditioning room is abrupt, it is possible to quickly switch to the air conditioning operation. Deviations from the upper limit value and the lower limit value can be prevented, and large fluctuations in the air pressure in the air-conditioning room during the switching operation from the full outside air operation to the circulation operation can be prevented.

  A second damper installed in an air supply duct extending upstream of the air conditioner, and a third damper installed in an exhaust duct, and the second and third dampers in the circulation air-conditioning operation, all outside air operation, and switching operation. In the air conditioning operation mode change system in which the opening degree of the opening / closing mechanism is maintained at 40 to 60%, the opening degree of the opening / closing mechanism of the second and third dampers is maintained at 40 to 60% during the switching operation. A predetermined amount of air can be supplied to the air conditioning chamber through the bypass duct provided with the first damper while supplying a predetermined amount of outside air to the air conditioning chamber using the second and third dampers. In the switched circulating air-conditioning operation, the mixing ratio of the outside air and the circulating air passing through the bypass duct can be made substantially 1: 1. In the air conditioning operation mode changing system, the mixing ratio of the outside air and the circulating air passing through the bypass duct is substantially 1: 1 while maintaining the indoor air pressure of the air conditioning room within the range between the upper limit value and the lower limit value of the target room pressure. Thus, it is possible to quickly switch from all outside air operation to circulation air-conditioning operation using these dampers. Since the air-conditioning operation mode changing system does not operate the opening and closing mechanisms of the second and third dampers, it is possible to save labor and cost for operating these damper opening and closing mechanisms, and to construct the system at a low cost. it can.

  A second damper and a third damper installed in an air supply duct extending upstream of the air conditioner and a third damper installed in an exhaust duct, and opening and closing mechanisms of the second and third dampers opened in the switching operation The closing operation means that gradually closes to the opening, the opening and closing mechanism of the first damper from the start of the opening operation means to the predetermined opening, and the opening and closing mechanisms of the second and third dampers from the start of the closing operation means to the predetermined If the air pressure in the air-conditioned room measured by the pressure sensor exceeds the upper limit of the target room pressure or the air pressure in the air-conditioned room measured by the pressure sensor is lower than the lower limit of the target room pressure. The air conditioning operation mode changing system that performs the opening degree second maintaining means that interrupts the closing operation means and maintains the opening degree of the opening mechanisms of the second and third dampers at that time when the value falls below the value is in the fully closed state. The first damper at During the execution of the opening operation means for gradually opening and fully opening the structure and during the closing operation for gradually closing the open / close mechanisms of the second and third dampers in the open state, the indoor air pressure in the air-conditioning chamber greatly increases, or In some cases, the air pressure in the air-conditioning chamber is greatly reduced. In the switching operation, the opening and closing mechanism of the first damper is fully opened from the start of the opening operation means and from the start of the closing operation means to the second and third dampers. The air pressure in the air conditioning room measured by the pressure sensor exceeds the upper limit of the target room pressure until the opening / closing mechanism reaches the predetermined opening, or the air pressure in the air conditioning room measured by the pressure sensor is the target. When the lower limit value of the chamber pressure is exceeded, the closing operation of the opening mechanisms of the second and third dampers is stopped, and the opening degree of the opening mechanisms of the second and third dampers at that time is maintained. Air pressure in the air conditioning room Even if the upper limit value of the target room pressure is exceeded, the indoor air pressure can be quickly reduced below the upper limit value of the target room pressure, and the air pressure in the air conditioning room falls below the lower limit value of the target room pressure during the switching operation. Even so, it is possible to quickly exceed the room pressure with respect to the lower limit value of the target room pressure. Since the air-conditioning operation mode change system can prevent deviation of the target room pressure of the air-conditioning room from the upper limit value and the lower limit value during the switching operation, the air-conditioning room during the switching operation from the all-outside air operation to the circulation air-conditioning operation. The indoor air pressure of the air-conditioning room measured by the pressure sensor while the opening degree of the second and third dampers is maintained by the opening degree second maintaining means can be prevented. Is lower than the upper limit value of the target chamber pressure, or when the indoor air pressure of the air-conditioned room measured by the pressure sensor exceeds the lower limit value of the target chamber pressure, the second opening maintaining means is interrupted and the closing operation means is Since the opening and closing mechanisms of the second and third dampers are gradually closed, the indoor air pressure of the air conditioning chamber is maintained within the range between the upper limit value and the lower limit value of the target chamber pressure, and the circulation air conditioning operation is started from the full outside air operation. Quickly switch to It is possible. In the air conditioning operation mode change system, the pressure difference between the indoor air pressure and the external air pressure in the air conditioning room does not become larger than necessary during the switching operation, and a large amount of outside air and air in the adjacent space inadvertently enter the air conditioning room. It is possible to prevent the contamination of the air-conditioning room by the invading outside air or the air in the adjacent space.

  In the first opening degree maintaining means, the indoor air pressure of the air-conditioned room measured by the pressure sensor between the start of the closing operation means and the opening and closing mechanisms of the second and third dampers reaches a predetermined opening degree. If the air pressure in the air-conditioned room measured by the pressure sensor falls below the lower limit value of the target room pressure, the opening operation means is interrupted and the opening / closing mechanism of the first damper at that time is opened. In the switching operation, the air conditioning operation mode change system maintains the air conditioner room measured by the pressure sensor from the start of the closing operation means until the opening mechanisms of the second and third dampers reach a predetermined opening degree. When the atmospheric pressure exceeds the upper limit value of the target chamber pressure, or when the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the opening operation of the opening / closing mechanism of the first damper is stopped, The first damper at that time Since the opening degree of the opening / closing mechanism is maintained, even if the indoor air pressure in the air-conditioned room exceeds the upper limit value of the target room pressure during the switching operation, the indoor air pressure can be quickly reduced below the upper limit value of the target room pressure. Even if the indoor air pressure in the air-conditioning room falls below the lower limit value of the target room pressure during the switching operation, the indoor air pressure can be quickly exceeded with respect to the lower limit value of the target room pressure. Since the air-conditioning operation mode change system can prevent deviation of the target room pressure of the air-conditioning room from the upper limit value and the lower limit value during the switching operation, the air-conditioning room during the switching operation from the all-outside air operation to the circulation air-conditioning operation. It is possible to prevent a large fluctuation in the indoor air pressure and to quickly switch from the all-outside air operation to the circulation air-conditioning operation.

  When the change in the indoor air pressure of the air conditioning room measured by the pressure sensor is slow, the closing speed of the opening mechanism of the second and third dampers is increased, and when the change in the indoor air pressure of the air conditioning room is abrupt, the second and third The air-conditioning operation mode change system that performs the opening / closing speed second changing means that slows down the closing speed of the damper opening / closing mechanism increases the opening speed of the opening / closing mechanism of the first damper when the change in the indoor air pressure of the air-conditioning room is moderate. Since the closing speed of the opening and closing mechanisms of the second and third dampers is increased, the entire outside air operation can be quickly switched to the circulation air-conditioning operation. Further, when the change in the air pressure in the air-conditioning room is abrupt, the opening speed of the opening / closing mechanism of the first damper is slowed down and the closing speed of the opening / closing mechanism of the second and third dampers is slowed down. Deviations of the indoor air pressure of the room from the upper limit value and the lower limit value of the target room pressure can be prevented, and a large fluctuation in the indoor air pressure of the air-conditioning room during the switching operation from the all-outside air operation to the circulation operation can be prevented.

  The air conditioning in which the opening degree of the opening and closing mechanisms of the second and third dampers is kept fully open in the full outside air operation, and the opening degree of the opening and closing mechanisms of the second and third dampers in the fully opening state is closed by the closing operation means to 40 to 60%. In the operation mode changing system, the opening degree of the opening and closing mechanisms of the second and third dampers is closed to 40 to 60% during the switching operation, so that a predetermined amount of outside air is conditioned by using the second and third dampers. A predetermined amount of air can be supplied to the air-conditioning room through the bypass duct provided with the first damper while the air is being supplied to the air. The mixing ratio can be approximately 1: 1. In the air conditioning operation mode changing system, the mixing ratio of the outside air and the circulating air passing through the bypass duct is substantially 1: 1 while maintaining the indoor air pressure of the air conditioning room within the range between the upper limit value and the lower limit value of the target room pressure. Thus, it is possible to quickly switch from all outside air operation to circulation air-conditioning operation using these dampers.

  The clean room is fumigated with chemicals such as formalin and hydrogen peroxide after the air conditioner is stopped and before the air conditioner is started, or the air conditioner is operated after the air conditioner is stopped and the air conditioner is started. The air conditioner operation mode change system, which performs maintenance of the form change system and performs all outdoor air operation after fumigation or after maintenance, and also performs switching operation after all outdoor air operation, is operated after all fumigation and after system maintenance. Therefore, chemicals such as formalin and hydrogen peroxide can be quickly exhausted from the clean room, dust generated during maintenance can be exhausted from the clean room, and chemicals and dust can be exhausted from the clean room. Deviation of the room pressure of the clean room from the target room pressure While techniques can be promptly switched to circulate the air conditioning operation from the full outside air operation.

The block diagram of the air-conditioning operation mode change system shown as an example. The figure which shows the transition of the driving | running state of an air-conditioning driving | operation form change system. The figure which shows all the external air driving | operations in an air-conditioning driving | operation mode change system. The figure which shows the switching driving | operation in an air-conditioning driving | operation mode change system. (A) is a figure which shows an example of a time-dependent change of the indoor air pressure until the indoor air pressure of a clean room reaches a target room pressure, (b) is a time until the indoor air pressure of a clean room reaches a target room pressure. The figure which shows another example of the time-dependent change of indoor air pressure of this, (c) is a figure which shows an example of the opening operation | movement of the turning blade of the 1st motor damper during switching operation. The flowchart for demonstrating each means performed in the switching operation of the air-conditioning operation mode change system of FIG. The block diagram of the air-conditioning driving | operation mode change system shown as another example. The figure which shows all the external air driving | operations in the air-conditioning driving | operation mode change system of another example. The figure which shows the switching driving | operation in the air-conditioning driving | operation mode change system of another example. (A) is a figure which shows an example of a time-dependent change of the indoor air pressure until the indoor air pressure of a clean room reaches a target room pressure, (b) is a time until the indoor air pressure of a clean room reaches a target room pressure. The figure which shows another example of the time change of indoor air pressure of this, (c) is a figure which shows an example of the opening operation | movement of the swirl | wing blade of a 1st-3rd motor damper during a switching operation, and a closing operation | movement. The flowchart for demonstrating each means performed in the switching operation of the air-conditioning operation mode change system of FIG. 12 is a flowchart continued from FIG.

  The details of the air-conditioning operation mode change system according to the present invention will be described with reference to the accompanying drawings such as FIG. 1 which is a configuration diagram of the air-conditioning operation mode change system 10A shown as an example. FIG. 2 is a diagram showing a transition of the operation state of the air-conditioning operation mode change system 10A, and FIG. 3 is a diagram showing an all outside air operation in the air-conditioning operation mode change system 10A. FIG. 1 shows a state where the circulating air-conditioning operation is performed in the air-conditioning operation mode changing system 10A. FIG. 1 shows the clean room 11 from the side.

  The air-conditioning operation mode change system 10A performs the circulation air-conditioning operation and the all-outside air operation for the clean room 11 (air-conditioning room) installed in one corner of the building, and performs the switching operation for switching from the all-outside air operation to the circulation air-conditioning operation. After the switching operation, the circulating air-conditioning operation is performed again. The system 10A controls the opening operation of the swirl vane 24 (opening / closing mechanism) described later in the first motor damper 17 in the switching operation, and prevents the fluctuation of the indoor air pressure of the clean room 11 during the switching operation, while the air conditioning operation of the clean room 11 is performed. Is quickly switched from all-outside air operation to circulating air-conditioning operation.

  In FIG. 1, only one clean room 11 is illustrated. However, the clean room 11 is not limited to one room, and the control of the air conditioning operation mode change system 10A is performed on two or more clean rooms. It is also possible to quickly switch the air conditioning operation of a plurality of clean rooms from the entire outside air operation to the circulation air conditioning operation. Further, the system 10A can be employed not only in the clean room 11 but also in all other types of air conditioning rooms.

  The air-conditioning operation mode changing system 10A includes an air supply duct 12 that supplies outdoor air to a clean room 11 installed in a building, an exhaust duct 13 that discharges air from the clean room 11 to the outdoors, an air supply duct 12, and an exhaust. A bypass duct 14 that connects the duct 13, an air conditioner 15 that supplies conditioned air to the clean room 11, an exhaust fan 16 (exhaust device) that exhausts air from the clean room 11, and a first installed in the bypass duct 14. A motor damper 17 (first damper) (MD), a pressure sensor 18 for measuring the indoor air pressure of the clean room 11, and a controller 19 for controlling the opening / closing operation of the swirl blade 24 (opening / closing mechanism) of the motor damper 17 are provided. . Predetermined power is supplied to the air conditioner 15, the exhaust fan 16, the first motor damper 17, the pressure sensor 18, and the controller 19 through a power supply line.

  The clean room 11 has a clean air-conditioned space of a predetermined volume surrounded by a ceiling, a floor, front and rear walls, and side walls, and is partitioned from the outside by the ceiling, the floor, and these walls. An air supply port (not shown) for taking air supplied from the air supply duct 12 into the clean room 11 is provided on the ceiling. An exhaust port (not shown) for taking the air of the clean room 11 into the exhaust duct 13 is provided on the floor or side wall. The clean room 11 is provided with a door (not shown) for entering and exiting the clean room 11. In the clean room 11, the indoor air pressure is strictly managed, and the indoor air pressure is maintained at the target room pressure (positive pressure) in the circulation air-conditioning operation.

  The air supply duct 12 is connected to an air supply port provided on the ceiling of the clean room 11, and connects the outdoor and the clean room 11. A first air volume adjustment damper 20 (VD) is installed in the duct 12 that extends upstream of the junction 26 between the air supply duct 12 and the bypass duct 14. The opening degree of the swirl vane 21 (opening / closing mechanism) of the first air volume adjusting damper 20 is fixed to 40 to 60% (preferably 50%).

  The air conditioner 15 is installed in the air supply duct 12 extending between the air supply port of the clean room 11 and the bypass duct 14. In the air conditioner 15, the frequency of a fan built in the air conditioner 15 is controlled by an inverter to forcibly supply the conditioned air having a preset air volume to the clean room 11 in the circulation air-conditioning operation, all-outside air operation, and switching operation.

  The exhaust duct 13 is connected to an exhaust port provided on the floor or side wall of the clean room 11 and connects the clean room 11 and the outdoors. A second air volume adjustment damper 22 (VD) is installed in the duct 13 that extends downstream of the branch point 27 between the exhaust duct 13 and the bypass duct 14. The opening degree of the swirl vane 23 (opening / closing mechanism) of the second air volume adjusting damper 22 is fixed at 40 to 60% (preferably 50%).

  The exhaust fan 16 is installed in an exhaust duct 13 that extends between the exhaust port of the clean room 11 and the bypass duct 14. The frequency of the exhaust fan 16 is controlled by an inverter, and forcibly exhausts air of a preset air volume from the clean room 11 in the circulation air-conditioning operation, all outside air operation, and switching operation. The bypass duct 14 is connected to an air supply duct 12 extending upstream of the air conditioner 15 and an exhaust duct 13 extending downstream of the exhaust fan 16.

  The first motor damper 17 is formed of a modular roll motor, a swirl vane 24 (opening / closing mechanism) that is swung by the driving force of the motor, and an air flow path that is opened and closed by swirling the swirl blade 24. The controller of the motor damper 17 is connected to the controller 19 via the control signal line 25, and the opening and closing operations of the swirl vanes 24 are controlled by the controller 19. The time required from the fully closed to fully opened swirl vanes 24 of the motor damper 17 is in the range of 60 to 600 seconds, and preferably in the range of 60 to 200 seconds.

  The control unit of the first motor damper 17 is a closing operation continuation signal indicating that the swirl vane 24 is being closed, a fully closed completion signal indicating that the air flow path is closed (fully closed) by the swirl vane 24, and the swirl vane An open operation continuation signal indicating that 24 is in the open operation and an open completion signal indicating that the air flow path is opened to a predetermined opening by the swirl vane 24 are transmitted to the controller 19. Further, a pause signal indicating that the opening operation of the swirling blade 24 is temporarily stopped and an opening operation restart signal indicating that the opening operation of the swirling blade 24 is resumed are transmitted to the controller 19.

  The pressure sensor 18 is connected to the controller 19 via the control signal line 25. The pressure sensor 18 measures the indoor pressure of the clean room 11 and transmits an electrical signal indicating the measured indoor pressure to the controller 19. The controller 19 is a computer having a central processing unit (CPU or MPU) that performs arithmetic processing and a memory that can store various data. An input device for inputting various data and operating conditions and a display device for input confirmation are connected to the controller 19 via an interface (not shown).

  The memory of the controller 19 stores a target room pressure of the clean room 11, an upper limit value of the target room pressure of the clean room 11, and a lower limit value of the target room pressure of the clean room 11. The target chamber pressure is input from the input device to the controller 19 and stored in the memory of the controller 19. The value of the target chamber pressure can be arbitrarily set via the input device.

  As the upper limit value of the target chamber pressure, a chamber pressure set between the target chamber pressure of the clean room 11 and the upper limit chamber pressure is used. The upper limit value of the target chamber pressure is input from the input device to the controller 19 and stored in the memory of the controller 19. The upper limit value of the target chamber pressure can be arbitrarily set via the input device.

  As the lower limit value of the target chamber pressure, a chamber pressure set between the target chamber pressure of the clean room 11 and the lower limit chamber pressure is used. The lower limit value of the target chamber pressure is input from the input device to the controller 19 and stored in the memory of the controller 19. The lower limit value of the target chamber pressure can be arbitrarily set via the input device.

  The controller 19 includes a closing operation start signal for closing (fully closing) the air flow path by the swirl vane 24 of the first motor damper 17, a closing operation stop signal for stopping the closing operation of the swirl vane 24, and an air flow path by the swirl vane 24. An opening operation start signal for opening the swing blade 24, an opening operation stop signal for stopping the opening operation of the swirling blade 24, an opening operation pause signal for temporarily stopping the opening operation of the swirling blade 24, and the swirling blade 24 temporarily stopped. An opening operation resumption start signal for resuming the opening operation is transmitted to the control unit of the motor damper 17.

  In normal times in the air conditioning operation mode changing system 10A, the circulating air conditioning operation is performed. In the circulating air conditioning operation, the air conditioner 15, the exhaust fan 16, the first motor damper 17, and the pressure sensor 18 are operated, and a predetermined amount of air conditioned by the air conditioner 15 is supplied to the clean room 11 as shown in FIG. A predetermined amount of air is exhausted from the clean room 11 by the exhaust fan 16. In the circulating air-conditioning operation, the indoor pressure in the clean room 11 is transmitted from the pressure sensor 18 to the controller 19, and the indoor pressure in the clean room 11 is maintained at the target room pressure.

  In the circulating air conditioning operation, the controller 11 keeps the opening degree of the swirl vane 24 of the first motor damper 17 at 40 to 60% (preferably 50%). In the circulating air-conditioning operation, the air flow path of the first motor damper 17 is opened about half, and about half of the air flowing out of the clean room 11 at the branch point 27 between the exhaust duct 13 and the bypass duct 14 (about half the air volume). Is discharged from the exhaust port to the outside (outdoors) of the building through the duct 13, and the remaining half (about half the air volume) flows into the bypass duct 14. Note that the opening degree of the swirl vane 24 of the first motor damper 17 may be maintained at 60% or more or fully open. In this case, the diameter of the duct 14 is designed so that about half of the air flowing out of the clean room 11 flows into the bypass duct 14.

  The air that has flowed into the bypass duct 14 passes through the air flow path of the first motor damper 17, reaches the junction 26 between the air supply duct 12 and the bypass duct 14, and is taken in from the air inlet of the building at the junction 26. Then, the air flows into the clean room 11 through the air conditioner 15. The air supplied to the clean room 11 in the circulation air-conditioning operation is a mixture of about half the outside air (about half the air volume) and about half the circulating air (about half the air volume) flowing from the bypass duct 14. By performing the circulation air conditioning operation, the amount of outside air introduced can be reduced, and the heat load applied to the air conditioner 15 can be reduced, thereby contributing to energy saving.

  In the clean room 11, fumigation is regularly performed to spray chemicals such as formalin and hydrogen peroxide in the clean room 11 in order to keep the inside of the clean room 11 free of microorganisms. In addition, maintenance (inspection, cleaning, repair, etc.) of the system 10A is performed. In fumigation and maintenance, the air conditioner 15 and the exhaust fan 16 are stopped, and the circulating air conditioning operation is interrupted. As shown in FIG. 2, after the fumigation is completed, the medicine remaining in the clean room 11 is exhausted to the outside of the room. Therefore, all outdoor air operation is performed, and after maintenance is completed, the dust remaining in the clean room 11 is exhausted to the outside. Therefore, all outside air operation is performed.

  In addition, in the all outside air operation, in addition to fumigation and maintenance, when the heat load for making the exhaust air from the clean room 11 into the conditioned air is larger than the outside air, an operation for generating dust and odor is performed in the clean room 11. In the case, the carbon dioxide concentration of the clean room 11 is high (the oxygen concentration is low). In these cases, the circulation air-conditioning operation is switched to the all-outside air operation without stopping the air conditioner 15 and the exhaust fan 16.

  When the all outside air operation is performed, the all outside air operation button displayed on the display device of the controller 19 is pushed. When the all outside air operation button is pressed, the controller 19 transmits a closing operation start signal to the control unit of the first motor damper 17. The control unit of the motor damper 17 causes the swirl blade 24 to perform a closing operation according to the closing operation start signal transmitted from the controller 19 and gradually closes the air flow path of the motor damper 17. When the swirl vane 24 is in the closing operation, the control unit of the motor damper 17 transmits a closing operation continuing signal to the controller 19.

  The controller of the first motor damper 17 transmits a fully closed completion signal to the controller 19 after the air flow path is closed (fully closed) by the swirl vanes 24. The controller 19 that has received the fully closed completion signal transmits a closing operation stop signal to the control unit of the motor damper 17 to stop the closing operation of the swirl vane 24. The control unit of the motor damper 17 that has received the closing operation stop signal ends the closing operation of the swirl vane 24. The controller 19 displays a message indicating that the damper is closed on the display device.

  In the case of fumigation or maintenance with chemicals, the air conditioner 15 and the exhaust fan 16 are restarted after a message indicating that the first motor damper is closed is displayed. In other cases, the air flow path of the motor damper 17 is closed (fully closed) to automatically switch from the circulation air conditioning operation to the all outside air operation. In the all outside air operation, in addition to the case where the opening degree of the swirling blades 21 and 23 of the first air volume adjusting damper 20 and the second air volume adjusting damper 22 is fixed to 40 to 60% (preferably 50%), the swirling blade The opening degree of 21 and 23 may be fully opened.

  In the all outside air operation, the controller 19 keeps the opening degree of the swirl vane 24 of the first motor damper 17 fully closed. In the all outside air operation, the air conditioner 15, the exhaust fan 16, and the pressure sensor 18 are operated, and as shown in FIG. 3, the outside air taken in from the air supply port flows into the air conditioner 15 through the first air volume adjustment damper 20. A predetermined amount of air (outside air) conditioned by the air conditioner 15 is supplied to the clean room 11, and a predetermined amount of air is exhausted from the clean room 11 by the exhaust fan 16. In the all outside air operation, the air flow path of the motor damper 17 is closed by the swirl vanes 24, so that the air flowing out from the clean room 11 does not flow into the bypass duct 14, and all the air flowing out from the clean room 11 is the second. The air is exhausted to the outside through an air outlet of the building through the air volume adjusting damper 22.

  By performing the all outside air operation, the medicine remaining in the clean room 11 is exhausted to the outside, and the dust remaining in the clean room 11 is exhausted to the outside. Further, dust and odor generated in the clean room 11 are exhausted to the outside. Alternatively, the carbon dioxide concentration in the clean room 11 decreases (the oxygen concentration increases).

  FIG. 4 is a diagram showing the switching operation in the air conditioning operation mode changing system 10A, and FIG. 5A is an example of a temporal change in the room pressure until the room pressure in the clean room 11 reaches the target room pressure. FIG. FIG.5 (b) is a figure which shows another example of the time change of the room | chamber interior pressure until the room | chamber interior pressure of the clean room 11 reaches a target room pressure, FIG.5 (c) is FIG. FIG. 4 is a diagram illustrating an example of an opening operation of a swirl blade 24 (opening / closing mechanism) of the first motor damper 17. FIG. 6 is a flowchart for explaining each means performed in the switching operation. FIG. 4 shows a state where the swirl vanes 24 of the first motor damper 17 continue to open.

  Based on these drawings, each means performed by the air-conditioning operation mode change system 10A in the switching operation will be described as follows. The air conditioning operation mode change system 10A performs a switching operation for switching from the all outside air operation to the circulation air conditioning operation after performing the all outside air operation. The switching operation will be described as an example in which the execution time of the all-out air operation is stored in the memory of the controller 19 and the switching operation is performed after the execution time has elapsed, but the all-out air operation displayed on the display device of the controller 19 In some cases, the stop button is pressed to stop the all-out air operation, and then the switching operation is displayed by pressing the switching operation button displayed on the display device. At the end of all outdoor air operation, the swirl vanes 24 of the first motor damper 17 are in a fully closed state. In addition, when the opening degree of the swirling blades 21 and 23 of the first and second air volume adjusting dampers 20 and 22 is fully opened in the full outside air operation, the opening degree of the swirling blades 21 and 23 is 40 to 60% (preferably , 50%).

  The controller 19 maintains the fully closed state of the swirl vanes 24 and continues the all outside air operation (S-1), and determines whether the execution time of the all outside air operation has elapsed (S-2). If the implementation time of all outside air operation has not elapsed, all outside air operation is continued. When the controller 19 determines in step 2 (S-2) that the execution time of all outside air operation has elapsed, the controller 19 transmits an opening operation start signal to the control unit of the first motor damper 17. The control unit of the motor damper 17 that has received the opening operation start signal starts the opening operation of the swirl vanes 24 in the fully closed state (opening operation means) (S-3). The swirl vanes 24 are swung by the modular roll motor and the air flow path of the motor damper 17 is gradually opened. When the swirl vane 24 is in an opening operation, the control unit of the motor damper 17 transmits an opening operation continuing signal to the controller 19.

  The controller 19 that has received the opening operation continuation signal (when the opening operation means is being executed) performs the opening operation of the swirl vanes 24 of the first motor damper 17 when the change in the indoor air pressure of the clean room 11 measured by the pressure sensor 18 is slow. Increase the speed (turning speed) (opening / closing speed first changing means). For example, when the indoor air pressure changes slowly (changes at a slow speed) in the range of 0 to ± 5 Pa per unit time, the speed of the opening operation of the swirl vanes 24 is faster than the current speed in the range of 60 to 600 seconds. To do. On the other hand, when the change in the indoor air pressure of the clean room 11 is abrupt, the opening operation speed (swing speed) of the swirl vanes 24 of the first motor damper 17 is slowed (opening / closing speed first changing means). For example, when the room pressure suddenly changes (changes at a high speed) in the range of 0 to ± 5 Pa per unit time, the speed of the opening operation of the swirl vane 24 is slower in the range of 60 to 600 seconds than the current speed. To do.

  The air-conditioning operation mode change system 10A increases the speed of the opening operation of the swirl blade 24 of the first motor damper 17 when the change in the indoor air pressure of the clean room 11 is gradual. Since the opening speed of the swirl vane 24 of the motor damper 17 is slowed when the change in the indoor air pressure of the clean room 11 is abrupt, it is possible to prevent the indoor air pressure of the clean room 11 from deviating from the target room pressure during the switching operation. It is possible to prevent a large fluctuation in the indoor pressure of the clean room 11 during the switching operation from the all-outside air operation to the circulation operation.

  The controller 19 starts from the opening operation of the swirl vane 24 until it receives an open completion signal from the control unit of the first motor damper 17 (the opening degree of the swirl vane 24 (opening / closing mechanism) from the start of the opening operation means). Until a predetermined opening (until a certain opening of 40% or more or fully opened) has the room pressure of the clean room 11 received from the pressure sensor 18 exceeded the upper limit of the target room pressure (the target room pressure It is determined whether or not the room pressure in the clean room 11 has fallen below the lower limit value of the target room pressure (whether it has deviated from the target room pressure) (S-4). The controller 19 is configured so that the room pressure in the clean room 11 is lower than the upper limit value of the target room pressure (when it is within the range between the upper limit value and the lower limit value of the target room pressure), or the room pressure in the clean room 11 is When the lower limit value of the target chamber pressure is exceeded (when it is within the range between the upper limit value and the lower limit value of the target chamber pressure), the opening operation of the swirl vanes 24 of the first motor damper 17 is continued (S- 5).

  The controller 19 determines whether the opening degree of the swirl vane 24 of the first motor damper 17 has reached a predetermined opening degree (S-6). When the opening operation continuing signal is transmitted from the control unit of the motor damper 17, the controller 19 determines that the opening degree of the swirl vane 24 is not the predetermined opening degree, and proceeds to Step 4 (S-4). Return and repeat the procedure from step 4. When the opening degree of the swirl blade 24 reaches a predetermined opening degree, the control unit of the motor damper 17 transmits an opening completion signal to the controller 19.

  The controller 19 that has received the opening completion signal transmits an opening operation stop signal to the control unit of the motor damper 17 to stop the opening operation of the swirl vane 24. Upon receiving the opening operation stop signal, the control unit of the motor damper 17 ends the opening operation of the swirl vane 24 (S-7). At this time, the circulating air conditioning operation is performed in the clean room 11 (S-8). On the display device of the controller 19, a message during the circulating air-conditioning operation is displayed. When the switching operation is switched to the circulating air-conditioning operation, the room pressure in the clean room 11 is maintained at the target room pressure as shown in FIGS. 5 (a) and 5 (b).

  If the opening operation of the swirl vanes 24 of the first motor damper 17 is continued during the switching operation, the air flow path of the motor damper 17 is gradually opened and flows out of the clean room 11 at the branch point 27 between the exhaust duct 13 and the bypass duct 14. The air thus gradually flows into the bypass duct 14, and the circulating air is mixed with the outside air at the junction 26 through the bypass duct 14. At this time, the pressure of the air flowing inside the air supply duct 12, the exhaust duct 13, and the bypass duct 14 fluctuates, and the indoor air pressure of the clean room 11 becomes the target room pressure as shown in FIGS. 5 (a) and 5 (b). There is a case where the upper limit value is exceeded or the indoor atmospheric pressure is lower than the upper limit value of the target room pressure.

  In step 4 (S-4), as shown in FIG. 5A, the controller 19 has the indoor pressure of the clean room 11 exceeding the upper limit value of the target chamber pressure (departs from the upper limit value of the target chamber pressure). 5), or as shown in FIG. 5B, it is determined that the indoor air pressure of the clean room 11 is lower than the lower limit value of the target room pressure (when it deviates from the lower limit value of the target room pressure). In this case, an opening operation pause signal is transmitted to the control unit of the first motor damper 17. The control unit of the motor damper 17 that has received the opening operation pause signal temporarily stops the opening operation of the swirl vane 24 (S-9) (opening first maintaining means), as shown in FIG. The control unit of the motor damper 17 that temporarily stops the opening operation of the swirl blade 24 transmits a temporary stop signal to the controller 19.

  The controller 19 that has received the pause signal indicates whether the room pressure of the clean room 11 received from the pressure sensor 18 has fallen below the upper limit value of the target room pressure before receiving the opening completion signal from the control unit of the motor damper 17. (Whether it has returned to the range between the upper limit value and the lower limit value of the target room pressure), or whether the room air pressure in the clean room 11 has exceeded the lower limit value of the target room pressure (the upper limit value and lower limit value of the target room pressure) (S-10).

  When the room pressure of the clean room 11 exceeds the upper limit value of the target room pressure (deviates from the upper limit value of the target room pressure), the controller 19 sets the lower limit value of the target room pressure. When it is lower (beyond the lower limit value of the target chamber pressure), the opening operation of the swirl vanes 24 of the first motor damper 17 is continuously suspended, and the procedure from Step 9 (S-9) is repeated. When the indoor air pressure of the clean room 11 deviates from the upper limit value or the lower limit value of the target room pressure, the supply duct 12, the exhaust duct 13, and the bypass duct 14 are temporarily stopped by temporarily stopping the opening operation of the swirl vanes 24 of the motor damper 17. As a result, the fluctuation factor of the pressure of the air flowing through the interior of the clean room 11 disappears, and the room pressure of the clean room 11 returns to the range between the upper limit value and the lower limit value of the target room pressure.

  In Step 10 (S-10), the controller 19 determines that the room pressure in the clean room 11 falls below the upper limit value of the target chamber pressure during the temporary stop of the opening operation of the swirl vanes 24 (the upper limit value and the lower limit value of the target chamber pressure). Or when the room air pressure of the clean room 11 exceeds the lower limit value of the target room pressure (when the air pressure returns to the range between the upper limit value and the lower limit value of the target room pressure). ), An opening operation resumption start signal is transmitted to the control unit of the first motor damper 17. Upon receiving the opening operation resumption start signal, the control unit of the motor damper 17 resumes the opening operation of the swirl vane 24 (S-11), and transmits an opening operation resumption signal and an opening operation continuing signal to the controller 19. The controller 19 that has received the opening operation resumption signal and the opening operation continuing signal repeats the procedure from Step 6 (S-6).

  The air conditioner operation mode changing system 10A is configured so that the room air pressure of the clean room 11 is changed during the execution of the opening operation means that gradually opens the swirl vanes 24 (opening / closing mechanism) of the first motor damper 17 in the fully closed state to a predetermined opening degree. Although the air pressure in the clean room 11 may increase greatly or may decrease greatly, the period from the start of the opening operation of the swirl vane 24 to the reception of the opening completion signal (from the start of the opening operation means in the switching operation) The room pressure in the clean room 11 measured by the pressure sensor 18 is equal to the target room pressure until the opening degree of the swirl vane 24 (opening / closing mechanism) reaches a predetermined opening degree (until an opening degree of 40% or more or fully open). When the upper limit value is exceeded, or when the indoor air pressure of the clean room 11 measured by the pressure sensor 18 falls below the lower limit value of the target room pressure, the opening operation means is interrupted and at that time. The opening first maintaining means for maintaining the opening of the swirl vane 24 of the motor damper 17 is performed and the opening operation of the swirl vane 24 of the motor damper 17 is stopped, so that the indoor pressure in the clean room 11 is changed to the target chamber during the switching operation. Even if the pressure exceeds the upper limit value of the pressure, the room pressure can be quickly lowered below the upper limit value of the target room pressure, and the room pressure of the clean room 11 falls below the lower limit value of the target room pressure during the switching operation. In addition, it is possible to quickly exceed the room pressure with respect to the lower limit value of the target room pressure.

  The air conditioning operation mode change system 10A can prevent deviation of the target room pressure of the clean room 11 from the upper limit value and the lower limit value during the switching operation. Therefore, the clean room during the switching operation from the all-outside air operation to the circulation air conditioning operation is possible. When the indoor air pressure of the clean room 11 falls below the upper limit value of the target room pressure, or the indoor air pressure of the clean room 11 exceeds the lower limit value of the target room pressure, the opening operation means can be prevented. Since the air flow passage is gradually opened by opening the swirl vanes 24 of the first motor damper 17, the room pressure of the clean room 11 is kept within the range between the upper limit value and the lower limit value of the target room pressure. On the other hand, it is possible to quickly switch from the all-outside air operation to the circulation air-conditioning operation. In the air conditioning operation mode change system 10A, the pressure difference between the indoor air pressure and the external air pressure of the clean room 11 does not become larger than necessary during the switching operation, and a large amount of outside air to the clean room 11 and air in the adjacent space are inadvertent. Intrusion can be prevented, and contamination in which the clean room 11 is contaminated by the invaded outside air or the air in the adjacent space can be prevented.

  FIG. 7 is a configuration diagram of an air conditioning operation mode change system 10B shown as another example, and FIG. 8 is a diagram illustrating an all-outside air operation in the air conditioning operation mode change system 10B. FIG. 7 shows a state where the circulating air-conditioning operation is performed in the air-conditioning operation mode changing system 10B. The air conditioning operation mode changing system 10B is different from that of FIG. 1 in that the first air volume adjustment damper 20 is replaced with the second motor damper 28, and the second air volume adjustment damper 22 is replaced with the third motor damper 29. Other configurations are the same as those of the air-conditioning operation mode changing system 10A in FIG. 1, and therefore, the same reference numerals as those in FIG. 1 are given, and the explanation of FIG. The detailed explanation is omitted.

  The air-conditioning operation mode changing system 10B performs the switching operation for switching from the all-outside air operation to the circulation air-conditioning operation and performs the switching operation for the clean room 11 (air-conditioning room) as well as that in FIG. After the operation, the circulation air-conditioning operation is performed again (see FIG. 2). The system 10B performs an opening operation of the swirl vane 24 (opening / closing mechanism) of the first motor damper 17 and a closing operation of the swirling blades 30, 31 (opening / closing mechanism) described later in the second and third motor dampers 28, 29 in the switching operation. The air-conditioning operation of the clean room 11 is quickly switched from the all-outside air operation to the circulation air-conditioning operation while preventing the fluctuation of the indoor air pressure of the clean room 11 during the switching operation.

  The air conditioning operation mode change system 10B includes an air supply duct 12, an exhaust duct 13, a bypass duct 14 that connects the air supply duct 12 and the exhaust duct 13, an air conditioner 15, an exhaust fan 16 (exhaust device), and a bypass duct. The first motor damper 17 (first damper) (MD) installed at 14, the second motor damper 28 (second damper) (MD) installed at the air supply duct 12, and the exhaust duct 13 A third motor damper 29 (third damper) (MD), a pressure sensor 18 and a controller 19 are provided. The ducts 12 to 14, the air conditioner 15, the exhaust fan 16, the first motor damper 17, the pressure sensor 18, and the controller 19 are the same as those of the system 10A in FIG.

  The second motor damper 28 is installed in the duct 12 that extends upstream of the junction 26 between the air supply duct 12 and the bypass duct 14. The third motor damper 29 is installed in the duct 13 that extends downstream from the branch point 27 between the exhaust duct 13 and the bypass duct 14. The second and third motor dampers 28 and 29 are a modular roll motor, swirling blades 30 and 31 (opening / closing mechanism) that are swung by the driving force of the motor, and an air flow path that is opened and closed by swirling of the swirling blades 30 and 31. Formed from.

  The control units of the second and third motor dampers 28 and 29 are connected to the controller 19 via the control signal line 25, and the opening and closing operations of the swirl vanes 30 and 31 are controlled by the controller 19. The time required from the fully closed to fully opened swirl vanes 30 and 31 of the motor dampers 28 and 29 is in the range of 60 to 600 seconds, and preferably in the range of 60 to 200 seconds.

  The control unit of the first motor damper 17 transmits a signal similar to that of the system 10A of FIG. The control units of the second and third motor dampers 28 and 29 indicate that the air flow path is opened (fully opened) by the swirl vanes 30 and 31, an open operation continuing signal indicating that the swirl vanes 30 and 31 are being opened. A fully open completion signal, a closing operation continuation signal indicating that the swirling blades 30 and 31 are being closed, and a state where the air flow path is closed by the swirling blades 30 and 31 (the opening degree of the swirling blades 30 and 31 is 40 to 60%) The closing completion signal indicating the state of closing until the controller 19 is transmitted to the controller 19. Further, a pause signal indicating that the swirling blades 30 and 31 are temporarily stopped and a closing operation restart signal indicating that the swirling blades 30 and 31 are closed again are transmitted to the controller 19.

  The controller 19 transmits a signal similar to that of the system 10 </ b> A of FIG. 1 to the control unit of the first motor damper 17. The controller 19 also opens an opening operation start signal that opens (fully opens) the air flow path using the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29, and an opening operation stop signal that stops the opening operation of the swirl vanes 24. , A closing operation start signal for closing the air flow path by the swirling blades 30 and 31, a closing operation stop signal for stopping the closing operation of the swirling blades 30 and 31, and a closing operation pause for temporarily stopping the closing operation of the swirling blades 30 and 31. A signal, a closing operation resumption start signal for resuming the closing operation of the swirling blades 30 and 31 that have been temporarily stopped, is transmitted to the control units of the motor dampers 28 and 29.

  In the circulation air conditioning operation, the air conditioner 15, the exhaust fan 16, the first to third motor dampers 17, 28, 29, and the pressure sensor 18 are operated, and as shown in FIG. Air is supplied to the clean room 11, and a predetermined amount of air is exhausted from the clean room 11 by the exhaust fan 16. In the circulating air-conditioning operation, the indoor pressure in the clean room 11 is transmitted from the pressure sensor 18 to the controller 19, and the indoor pressure in the clean room 11 is maintained at the target room pressure.

  In the circulating air conditioning operation, the controller 11 keeps the opening degree of the swirl vane 24 of the first motor damper 17 at 40 to 60% (preferably 50%), and swirl vanes of the second and third motor dampers 28 and 29. The opening degree of 30 and 31 is maintained at 40 to 60% (preferably 50%). As in the system 10A of FIG. 1, the opening degree of the swirl vane 24 of the first motor damper 17 may be kept 60% or more or fully open.

  In the circulation air-conditioning operation, the air flow path of the motor damper 17 is opened about half, the air flow paths of the motor dampers 28 and 29 are opened about half, and a clean room is formed at the branch point 27 between the exhaust duct 13 and the bypass duct 14. About half of the air flowing out from the air 11 (about half the air volume) passes through the duct 13 and is discharged from the exhaust port to the outside of the building (outdoor), and the other half (about half the air volume) flows into the bypass duct 14. To do. The air that has flowed into the bypass duct 14 passes through the air flow path of the first motor damper 17, reaches the junction 26 between the air supply duct 12 and the bypass duct 14, and is taken in from the air inlet of the building at the junction 26. Then, the air flows into the clean room 11 through the air conditioner 15.

  In the air-conditioning operation mode change system 10B, as in the system 10A of FIG. 1, the circulation air-conditioning operation is interrupted due to fumigation or maintenance with chemicals such as formalin and hydrogen peroxide, and other factors, and the entire outside air operation is performed. In the all outside air operation, the controller 19 transmits a closing operation start signal to the control unit of the first motor damper 17 and transmits an opening operation start signal to the control units of the second and third motor dampers 28 and 29.

  The control unit of the first motor damper 17 causes the swirl blade 24 to close in accordance with the closing operation start signal transmitted from the controller 19 and gradually closes the air flow path of the motor damper 17. When the swirl vane 24 is in the closing operation, the control unit of the motor damper 17 transmits a closing operation continuing signal to the controller 19. The control units of the second and third motor dampers 28 and 29 cause the swirl blades 30 and 31 to open according to the opening operation start signal transmitted from the controller 19 and gradually open the air flow paths of the motor dampers 28 and 29. The control units of the motor dampers 28 and 29 transmit an opening operation continuing signal to the controller 19 when the swirl vanes 30 and 31 are in the opening operation.

  After the air flow path is closed (fully closed) by the swirl vanes 24, the controller of the first motor damper 17 sends a fully closed completion signal to the controller 19 to control the second and third motor dampers 28 and 29. After the air flow path is opened (fully opened) by the swirl vanes 30 and 31, the unit transmits a fully open completion signal to the controller 19. The controller 19 that has received the fully closed completion signal and the fully opened complete signal transmits a closing operation stop signal to the control unit of the motor damper 17 to stop the closing operation of the swirl vane 24 and opens it to the control units of the motor dampers 28 and 29. An operation stop signal is transmitted, and the opening operation of the swirl vanes 30 and 31 is stopped. The control unit of the motor damper 17 that has received the closing operation stop signal ends the closing operation of the swirl blade 24, and the control unit of the motor dampers 28 and 29 that has received the opening operation stop signal has the opening operation of the swirling blades 30 and 31. Exit. The controller 19 displays a damper closing completion message and a damper opening completion message on the display device.

  In the full outside air operation, the controller 19 keeps the opening degree of the swirl vanes 24 of the first motor damper 17 fully closed, and keeps the opening degree of the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29 fully opened. To do. In the all outside air operation, the air conditioner 15, the exhaust fan 16, and the pressure sensor 18 are operated, and as shown in FIG. 8, the outside air taken in from the air supply port flows into the air conditioner 15 through the second motor damper 28. A predetermined amount of air (outside air) conditioned by the air conditioner 15 is supplied to the clean room 11, and a predetermined amount of air is exhausted from the clean room 11 by the exhaust fan 16. In the all outside air operation, the air flow path of the motor damper 17 is closed by the swirl vanes 24, so that the air flowing out from the clean room 11 does not flow into the bypass duct 14, and all the air flowing out from the clean room 11 is the third. The air is exhausted through the motor damper 29 from the exhaust port of the building.

  FIG. 9 is a diagram showing the switching operation in the air conditioning operation mode changing system 10B. FIG. 10A is an example of the temporal change in the room pressure until the room pressure in the clean room 11 reaches the target room pressure. FIG. FIG.10 (b) is a figure which shows another example of the time change of the room | chamber interior pressure until the room | chamber interior pressure of the clean room 11 reaches a target room pressure, FIG.10 (c) is FIG. It is a figure which shows an example of opening operation | movement and closing operation | movement of the revolving blade | wing 24,30,31 (opening-closing mechanism) of the 1st-3rd motor dampers 17,28,29. FIG. 11 is a flowchart for explaining each means performed in the switching operation, and FIG. 12 is a flowchart continuing from FIG. FIG. 9 shows a state in which the swirl vanes 24 of the first motor damper 17 continue to open, and the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29 continue to open.

  The air conditioning operation mode change system 10B performs a switching operation for switching from the all outside air operation to the circulation air conditioning operation after performing the all outside air operation. The switching operation will be described by taking as an example a case where the execution time of the all-outside air operation is stored in the memory of the controller 19 and the switching operation is performed after the execution time has elapsed. At the end of the full outside air operation, the swirl vanes 24 of the first motor damper 17 are in a fully closed state, and the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29 are in a fully open state.

  The controller 19 determines whether or not the implementation time of the full outside air operation has elapsed while maintaining the fully closed state of the swirl vane 24 and the swirl vanes 30 and 31 being fully opened (S-20) (S-21). ). If the implementation time of all outside air operation has not elapsed, all outside air operation is continued. When the controller 19 determines in step 20 (S-20) that the all-outside air operation time has elapsed, the controller 19 transmits an opening operation start signal to the control unit of the first motor damper 17, and the second and third motor dampers. A closing operation start signal is transmitted to the control units 28 and 29.

  The controller of the first motor damper 17 that has received the opening operation start signal starts the opening operation of the swirl vane 24 in the fully closed state (opening operation means) (S-22). The swirl vanes 24 are swung by the modular roll motor and the air flow path of the motor damper 17 is gradually opened. When the swirl vane 24 is in an opening operation, the control unit of the motor damper 17 transmits an opening operation continuing signal to the controller 19. The control units of the second and third motor dampers 28 and 29 that have received the closing operation start signal start the closing operation of the swirling blades 30 and 31 in the fully opened state (closing operation means) (S-22). The swirl vanes 30 and 31 are swung by the modular roll motor, and the air flow paths of the motor dampers 28 and 29 are gradually closed. When the swirl vanes 30 and 31 are in the closing operation, the control units of the motor dampers 28 and 29 transmit a closing operation continuing signal to the controller 19.

  The controller 19 that has received the opening operation continuation signal increases the opening operation speed (swinging speed) of the swirl vanes 24 of the first motor damper 17 when the change in the indoor pressure of the clean room 11 measured by the pressure sensor 18 is slow. When the change in the indoor air pressure in the clean room 11 is abrupt, the opening speed (turning speed) of the swirl vanes 24 of the first motor damper 17 is slowed (opening / closing speed first changing means).

  The controller 19 which has received the closing operation continuation signal (closing operation means being executed), when the change in the indoor air pressure of the clean room 11 measured by the pressure sensor 18 is slow, the swirl vanes of the second and third motor dampers 28 and 29. The speed of the closing operation of 30 and 32 (turning speed) is increased (second opening / closing speed changing means). For example, when the indoor air pressure changes slowly (changes at a slow speed) within a range of ± 5 to ± 15 Pa per unit time, the speed of the closing operation of the swirl blades 30 and 31 is 60 to 600 seconds higher than the current speed. Make it faster in range. On the other hand, when the change in the indoor air pressure of the clean room 11 is abrupt, the closing operation speed (swinging speed) of the swirling blades 30 and 31 of the second and third motor dampers 28 and 29 is decreased (second opening / closing speed changing means). ). For example, when the room pressure suddenly changes (changes at a high speed) within a range of ± 5 to ± 15 Pa per unit time, the opening speed of the swirl blades 30 and 31 is 60 to 600 seconds higher than the current speed. Slow down in range.

  The air conditioning operation mode changing system 10B increases the speed of the opening operation of the swirl vanes 24 of the first motor damper 17 and swivels the second and third motor dampers 28 and 29 when the change in the indoor air pressure of the clean room 11 is gradual. Since the speed of the closing operation of the blades 30 and 31 is increased, it is possible to quickly switch from the all-outside air operation to the circulation air-conditioning operation. When the change in the indoor air pressure of the clean room 11 is abrupt, the opening speed of the swirl vanes 24 of the motor damper 17 is slowed and the closing speed of the swirl vanes 30 and 31 of the motor dampers 28 and 29 is slowed. Therefore, the indoor air pressure of the clean room 11 can be prevented from deviating from the upper limit value and the lower limit value of the target room pressure, and a large fluctuation of the indoor air pressure of the clean room 11 during the switching operation from the all-outside air operation to the circulation operation can be prevented.

  The controller 19 starts from the opening operation of the swirl vane 24 until it receives an open completion signal from the control unit of the first motor damper 17 (from the start of the opening operation means in the switching operation to the swirl vane 24 (opening / closing mechanism)). Of the second and third motor dampers 28 and 29 after starting the closing operation of the swirl blades 30 and 31 and until the opening of the first and second rotating dampers 30 and 31 is closed. From the pressure sensor 18 until the closing completion signal is received from the control unit (from the start of the closing operation means until the opening degree of the swirling blades 30 and 31 reaches a predetermined opening degree (40 to 60%)). Whether the received room pressure of the clean room 11 exceeds the upper limit value of the target room pressure (has deviated from the upper limit value of the target room pressure), or whether the indoor pressure of the clean room 11 has fallen below the lower limit value of the target room pressure (target room Lower limit of pressure Or it deviates) to determine (S-23).

  The controller 19 is configured so that the room pressure in the clean room 11 is lower than the upper limit value of the target room pressure (when it is within the range between the upper limit value and the lower limit value of the target room pressure), or the room pressure in the clean room 11 is When the lower limit value of the target chamber pressure is exceeded (when it is within the range between the upper limit value and the lower limit value of the target chamber pressure), the opening operation of the swirl vanes 24 of the motor damper 17 is continued and the motor damper 28 is continued. 29, the closing operation of the swirling blades 30, 31 is continued (S-24).

  The controller 19 determines whether or not the opening degree of the swirl blade 24 of the first motor damper 17 has reached a predetermined opening degree, and the opening degree of the swirl blades 30 and 31 of the second and third motor dampers 28 and 29 is predetermined. (S-25). When the opening operation continuation signal or the closing operation continuation signal is transmitted from the control unit of the motor damper 17, the controller 19 indicates that the opening degree of the swirl vane 24 is not the predetermined opening degree. It is determined that the opening degree of 31 is not the predetermined opening degree, the process returns to step 23 (S-23) and the procedure from step 23 is repeated. When the opening degree of the swirl vane 24 reaches a predetermined opening degree (when the opening degree of the swirl vane 24 is opened to a certain degree of opening of 40% or more or fully opened), the control unit of the motor damper 17 sends an open completion signal. Transmit to the controller 19. When the opening degree of the swirling blades 30 and 31 reaches a predetermined opening degree (when the opening degree of the swirling blades 30 and 31 is closed to 40 to 60% (preferably 50%)), the motor dampers 28 and 29 The control unit transmits a closing completion signal to the controller 19.

  When the opening degree of the swirl vane 24 of the first motor damper 17 reaches a predetermined opening degree, the opening degree of the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29 is 40 to 60% (preferably 50%), the speed of the opening operation of the swirling blades 24 of the motor damper 17 is adjusted, and the speed of the closing operation of the swirling blades 30, 31 of the motor dampers 28, 29 is adjusted. In addition, the time until the opening degree of the swirl blade 24 becomes a predetermined opening degree from the fully closed and the time until the opening degree of the swirl blades 30 and 31 becomes 40 to 60% (preferably 50%) are different. In some cases.

  The controller 19 that has received the opening completion signal and the closing completion signal transmits an opening operation stop signal to the control unit of the motor damper 17 to stop the opening operation of the swirl vane 24 and to close the control unit of the motor dampers 28 and 29. An operation stop signal is transmitted, and the closing operation of the swirl vanes 30 and 31 is stopped. The control unit of the motor damper 17 that has received the opening operation stop signal ends the opening operation of the swirl blade 24, and the control unit of the motor dampers 28 and 29 that has received the closing operation stop signal closes the swirl blades 30 and 31. Is finished (S-26). At this time, the circulation air-conditioning operation is performed in the clean room 11 (S-27. A message indicating the circulation air-conditioning operation is displayed on the display device of the controller 19. When the switching operation is switched to the circulation air-conditioning operation, As shown in FIGS. 10A and 10B, the room pressure in the clean room 11 is maintained at the target room pressure.

  During the switching operation, when the opening operation of the swirl vanes 24 of the first motor damper 17 is continued and the closing operation of the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29 is continued, the air of the motor damper 17 The flow path is gradually opened, the air flow paths of the motor dampers 28 and 29 are gradually closed, and the air that has flowed out of the clean room 11 at the branch point 27 between the exhaust duct 13 and the bypass duct 14 gradually flows into the bypass duct 14. Circulating air is mixed with outside air at the junction 26 through the bypass duct 14. At this time, the pressure of the air flowing inside the air supply duct 12, the exhaust duct 13, and the bypass duct 14 fluctuates, and the indoor air pressure of the clean room 11 is set to the target room pressure as shown in FIGS. 10 (a) and 10 (b). There is a case where the upper limit value is exceeded or the room pressure is lower than the lower limit value of the target room pressure.

  In step 23 (S-23), as shown in FIG. 10A, the controller 19 has the indoor pressure of the clean room 11 exceeding the upper limit value of the target chamber pressure (departs from the upper limit value of the target chamber pressure). ) Or, as shown in FIG. 10B, it is determined that the indoor air pressure of the clean room 11 is lower than the lower limit value of the target room pressure (when the target room pressure deviates from the lower limit value). In this case, an opening operation pause signal is transmitted to the control unit of the first motor damper 17, and a closing operation pause signal is transmitted to the control units of the second and third motor dampers 28 and 29.

  The controller of the first motor damper 17 that has received the opening operation pause signal temporarily stops the opening operation of the swirl vane 24 as shown in FIG. 10C (S-28) (first opening maintaining means) ). The control unit of the motor damper 17 that temporarily stops the opening operation of the swirl blade 24 transmits a temporary stop signal to the controller 19. The control units of the second and third motor dampers 28 and 29 that have received the closing operation pause signal temporarily stop the closing operation of the swirl vanes 30 and 31 as shown in FIG. 10C (S-28). (Opening degree second maintaining means). The control units of the motor dampers 28 and 29 that temporarily stop the closing operation of the swirl blades 30 and 31 transmit a temporary stop signal to the controller 19.

  The controller 19 that has received the temporary stop signal receives the closing completion signal until the opening completion signal is received from the control unit of the first motor damper 17 and from the control units of the second and third motor dampers 28 and 29. Until the room pressure of the clean room 11 received from the pressure sensor 18 has fallen below the upper limit value of the target chamber pressure (returned to a range between the upper limit value and the lower limit value of the target chamber pressure), or It is determined whether the indoor air pressure in the clean room 11 has exceeded the lower limit value of the target room pressure (whether it has returned to the range between the upper limit value and the lower limit value of the target room pressure) (S-29).

  When the room pressure of the clean room 11 exceeds the upper limit value of the target room pressure (deviates from the upper limit value of the target room pressure), the controller 19 sets the lower limit value of the target room pressure. If it is lower (beyond the lower limit value of the target chamber pressure), the opening operation of the swirl vanes 24 of the first motor damper 17 is kept temporarily stopped, and the second and third motor dampers 28 and 29 are swung. The closing operation of the blades 30 and 31 is temporarily stopped, and the procedure from step 28 (S-28) is repeated. When the indoor air pressure in the clean room 11 deviates from the upper limit value or the lower limit value of the target room pressure, the opening operation of the swirling blades 24 of the motor damper 17 is temporarily stopped and the swirling blades 30 and 31 of the motor dampers 28 and 29 are closed. Is temporarily stopped so that there are no fluctuation factors of the pressure of the air flowing in the air supply duct 12, the exhaust duct 13, and the bypass duct 14, and the indoor air pressure of the clean room 11 is set between the upper limit value and the lower limit value of the target room pressure. Return to the range between.

  In step 29 (S-29), when the controller 19 temporarily stops the opening operation of the swirl blade 24 and the closing operation of the swirl blades 30 and 31, the indoor air pressure of the clean room 11 falls below the upper limit value of the target chamber pressure ( When the pressure returns to a range between the upper limit value and the lower limit value of the target room pressure), or when the indoor air pressure of the clean room 11 exceeds the lower limit value of the target room pressure (the upper limit value and lower limit value of the target room pressure) ), An opening operation resumption start signal is transmitted to the control unit of the first motor damper 17, and a closing operation resumption start signal is transmitted to the control units of the second and third motor dampers 28 and 29. To do.

  Upon receiving the opening operation resumption start signal, the control unit of the motor damper 17 resumes the opening operation of the swirl vane 24 (S-30), and transmits an opening operation resumption signal and an opening operation continuing signal to the controller 19. Receiving the closing operation resumption start signal, the control units of the motor dampers 28 and 29 resume the closing operation of the swirl vanes 30 and 31 (S-30), and transmit the closing operation resumption signal and the closing operation continuing signal to the controller 19. To do. The controller 19 that has received the opening operation resuming signal, the opening operation continuing signal, the closing operation resuming signal, and the closing operation continuing signal repeats the procedure from step 25 (S-25).

  The air-conditioning operation mode changing system 10B is in the middle of executing the opening operation means that gradually opens the swirl vanes 24 (opening / closing mechanism) of the first motor damper 17 in the fully closed state to open a predetermined opening degree. During the execution of the closing operation that gradually closes the swirl vanes 30 and 31 (opening and closing mechanisms) of the third motor dampers 28 and 29 to the predetermined opening degree, the indoor pressure in the clean room 11 greatly increases, or the interior of the clean room 11 Although the atmospheric pressure may drop greatly, the period from when the opening operation of the swirl vane 24 is started until the opening completion signal is received from the control unit of the first motor damper 17 (from the start of the opening operation means to the motor in the switching operation). (Until the opening degree of the swirling blade 24 (opening / closing mechanism) of the damper 17 reaches a predetermined opening degree) and the second and third motors after the closing operation of the swirling blades 30 and 31 is started. -Until a closing completion signal is received from the control unit of the dampers 28 and 29 (from the start of the closing operation means until the opening degree of the swirl vanes 30 and 31 of the motor dampers 28 and 29 reaches a predetermined opening degree). When the room pressure of the clean room 11 measured by the pressure sensor 18 exceeds the upper limit value of the target room pressure, or when the room pressure of the clean room 11 measured by the pressure sensor 18 falls below the lower limit value of the target room pressure, The operation means is interrupted and the opening first maintaining means for maintaining the opening degree of the swirl blade 24 of the motor damper 17 at that time is performed, the opening operation of the swirl blade 24 of the motor damper 17 is stopped, and the closing operation means is Suspension blades of the motor dampers 28 and 29 are performed by performing an opening degree second maintaining means for interrupting and maintaining the opening degree of the rotation blades 30 and 31 of the motor dampers 28 and 29 at that time. Since the closing operation of 30 and 31 is stopped, even if the indoor air pressure of the clean room 11 exceeds the upper limit value of the target room pressure during the switching operation, the indoor air pressure can be quickly reduced below the upper limit value of the target room pressure. Even if the indoor air pressure of the clean room 11 falls below the lower limit value of the target room pressure during the switching operation, the indoor air pressure can be quickly exceeded with respect to the lower limit value of the target room pressure.

  The air-conditioning operation mode change system 10B can prevent deviation of the target room pressure of the clean room 11 from the upper limit value and the lower limit value during the switching operation. Therefore, the clean room during the switching operation from the all-outside air operation to the circulation air-conditioning operation. When the indoor air pressure of the clean room 11 falls below the upper limit value of the target room pressure, or the indoor air pressure of the clean room 11 exceeds the lower limit value of the target room pressure, the opening operation means can be prevented. Then, the closing operation means is restarted, the swirl vanes 24 of the first motor damper 17 are opened, the air flow passage is gradually opened, and the swirl vanes 30 and 31 of the second and third motor dampers 28 and 29 are closed. Since the air flow path is gradually closed, the room pressure of the clean room 11 is kept within the range between the upper limit value and the lower limit value of the target room pressure. It can be promptly switched to circulate the air conditioning operation from the full outside air operation. The air-conditioning operation mode change system 10B does not cause the pressure difference between the indoor pressure and the external pressure in the clean room 11 to be unnecessarily large during the switching operation, and a large amount of outside air to the clean room 11 and air in the adjacent space are inadvertent. Intrusion can be prevented, and contamination in which the clean room 11 is contaminated by the invaded outside air or the air in the adjacent space can be prevented.

  In the system 10B of FIG. 7, the controller 19 does not transmit an opening operation start signal to the control unit of the motor dampers 28 and 29 during the all-out air operation, and the opening degree of the swirl blades 30 and 31 of the motor dampers 28 and 29 is circulated and air-conditioned. In some cases, the opening degree of the swirling blades 30 and 31 is maintained at 40 to 60%, preferably 50%. In this case, the control unit of the motor dampers 28 and 29 does not cause the swirl vanes 30 and 31 to open, and sets the opening degree of the swirl vanes 30 and 31 to the state during the circulating air-conditioning operation during the all-out air operation and the switching operation. maintain. When the opening degree of the swirling blades 30 and 31 is maintained in the state of the circulating air-conditioning operation in the all outside air operation and the switching operation, the closing operation start signal is not transmitted to the control unit of the motor dampers 28 and 29, and the swirling blades 30 and 31 The closing operation is not started, and a closing operation continuing signal and a closing completion signal are not transmitted to the controller 19.

  When the opening degree of the swirl vanes 30 and 31 is maintained in the state during the circulation air-conditioning operation, the controller 19 controls the first motor damper 17 after starting the opening operation of the swirl vane 24 in step 23 (S-23). The indoor pressure in the clean room 11 received from the pressure sensor 18 is the target until the opening completion signal is received from the section (from the start of the opening operation means until the opening of the swirl vane 24 reaches a predetermined opening). Whether the upper limit value of the room pressure has been exceeded (has deviated from the upper limit value of the target room pressure), or has the room pressure of the clean room 11 been lower than the lower limit value of the target room pressure (whether the deviated value has exceeded the lower limit value of the target room pressure) Judging.

  When maintaining the opening degree of the swirl blades 30 and 31 in the state during the circulation air-conditioning operation, in step 25 (S-25), the controller 19 sets the opening degree of the swirl blade 24 of the first motor damper 17 to a predetermined opening degree. Judgment is only made. In step 29 (S-29), the controller 19 determines that the room pressure of the clean room 11 received from the pressure sensor 18 is equal to the target room pressure until the controller 19 of the first motor damper 17 receives the opening completion signal. It is determined whether the upper limit value has been reached or whether the room pressure in the clean room 11 has exceeded the lower limit value of the target room pressure.

  The air-conditioning operation mode change system 10B that maintains the opening degree of the swirl blades 30 and 31 in the state during the circulation air-conditioning operation has the following effects in addition to the effects of the system 10A in FIG. The system 10B uses the motor dampers 28 and 29 by maintaining the opening degree of the swirl blades 30 and 31 (opening / closing mechanism) of the second and third motor dampers 28 and 29 at 40 to 60% during the switching operation. Then, while supplying a predetermined amount of outside air to the clean room 11, a predetermined amount of air can be supplied to the clean room 11 through the bypass duct 14 in which the first motor damper 17 is installed. In the operation, the mixing ratio of the outside air and the circulating air passing through the bypass duct 14 can be made substantially 1: 1. The system 10B maintains the room air pressure of the clean room 11 within a range between the upper limit value and the lower limit value of the target room pressure, and the mixing ratio of the outside air and the circulating air passing through the bypass duct 14 is approximately 1: 1. As described above, the motor dampers 17, 28, and 29 can be used to quickly switch from the all-outside air operation to the circulation air-conditioning operation. Since the system 10B does not operate the swirl blades 30 and 31 of the second and third motor dampers 28 and 29, the labor and cost of operating the swirl blades 30 and 31 of the motor dampers 28 and 29 can be saved. Therefore, the system 10B can be constructed at a low cost.

10A Air conditioning operation mode change system 10B Air conditioning operation mode change system 11 Clean room (air conditioning room)
12 Air supply duct 13 Exhaust duct 14 Bypass duct 15 Air conditioner 16 Exhaust fan (exhaust device)
17 First motor damper (first damper)
18 pressure sensor 19 controller 20 first air volume adjustment damper 21 swirl vane 22 second air volume adjustment damper 23 swirl vane 24 swirl vane (opening / closing mechanism)
26 Junction point 27 Branch point 28 Second motor damper (second damper)
29 Third motor damper (third damper)
30 Swirling blade (opening / closing mechanism)
31 Swirling blade (opening / closing mechanism)

Claims (8)

An air conditioner installed in the air supply duct for supplying air to the air conditioning room, an exhaust system installed in the exhaust duct for exhausting air from the air conditioning room, and the air supply duct extending upstream of the air conditioner; A bypass duct connecting the exhaust duct extending downstream of the exhaust device, a first damper installed in the bypass duct, a pressure sensor for measuring an indoor pressure in the air-conditioning chamber, and opening / closing of the first damper A circulation air-conditioning system comprising a controller for controlling the opening / closing operation of the mechanism, and circulating a predetermined amount of air to the air conditioning chamber using the bypass duct while supplying a predetermined amount of outside air from the air supply duct to the air conditioning chamber Changing the air-conditioning operation mode for performing the operation and stopping the circulating air-conditioning operation by fully closing the first damper opening / closing mechanism and supplying only the outside air from the air supply duct to the air-conditioning chamber In the stem,
The air-conditioning operation mode change system includes a switching operation for switching from the all-outside air operation to the circulation air-conditioning operation while maintaining the indoor air pressure of the air-conditioning chamber at a target chamber pressure, and the controller is in a fully closed state in the switching operation. An opening operation means for gradually opening the opening / closing mechanism of the first damper, and an indoor pressure of the air conditioning chamber measured by the pressure sensor between the start of the opening operation means and the opening / closing mechanism reaching a predetermined opening degree. When the upper limit value of the target chamber pressure is exceeded, or when the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the opening operation means is interrupted and Opening degree first maintaining means for maintaining the opening degree of the opening / closing mechanism of the first damper, and maintaining the opening degree of the opening / closing mechanism of the first damper by the opening degree first maintaining means, pressure When the indoor air pressure of the air-conditioned room measured by the sensor falls below the upper limit value of the target room pressure, or when the indoor air pressure of the air-conditioned room measured by the pressure sensor exceeds the lower limit value of the target room pressure, The air-conditioning operation mode changing system characterized by interrupting the first opening degree maintaining means and performing the opening operation means again.   The time required for the first damper opening / closing mechanism to be fully closed to fully open is in the range of 60 to 600 seconds. In the opening operation means, the controller detects a change in the indoor air pressure of the air conditioning chamber measured by the pressure sensor. An opening / closing speed first changing means for increasing the opening speed of the opening / closing mechanism of the first damper when slow, and slowing down the opening speed of the opening / closing mechanism of the first damper when a change in the indoor pressure of the air conditioning chamber is abrupt. The air-conditioning operation mode change system according to claim 1 which performs.   The air conditioning operation mode changing system includes a second damper installed in the air supply duct extending upstream of the air conditioner and a third damper installed in the exhaust duct, and the circulation air conditioning operation and the entire system The air-conditioning operation mode change system according to claim 1 or 2, wherein the opening degree of the opening / closing mechanism of the second and third dampers is maintained at 40 to 60% in the outside air operation and the switching operation.   The air conditioning operation mode changing system includes a second damper installed in the air supply duct extending upstream of the air conditioner and a third damper installed in the exhaust duct, and the controller in the switching operation includes: A closing operation means that gradually closes the opening and closing mechanisms of the second and third dampers in an open state to a predetermined opening, and from the start of the opening operation means until the opening and closing mechanism of the first damper reaches a predetermined opening. Between the start of the closing operation means and the opening and closing mechanisms of the second and third dampers reaching a predetermined opening, the indoor air pressure of the air conditioning chamber measured by the pressure sensor is the upper limit of the target chamber pressure When the value exceeds the value, or when the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the closing operation means is interrupted, and the second and current An opening degree second maintaining means for maintaining the opening degree of the opening and closing mechanism of the three dampers, and maintaining the opening degree of the opening and closing mechanisms of the second and third dampers by the opening degree second maintaining means, When the air pressure in the air-conditioned room measured by the pressure sensor falls below the upper limit value of the target room pressure, or the air pressure in the air-conditioned room measured by the pressure sensor exceeds the lower limit value of the target room pressure. In this case, the air conditioning operation mode change system according to claim 1 or 2, wherein the second opening maintaining means is interrupted and the closing operation means is performed again.   In the first opening degree maintaining means, the indoor air pressure of the air conditioning chamber measured by the pressure sensor between the start of the closing operation means and the opening and closing mechanisms of the second and third dampers reaching a predetermined opening degree. When the air pressure exceeds the upper limit value of the target chamber pressure, or when the indoor air pressure of the air conditioning chamber measured by the pressure sensor falls below the lower limit value of the target chamber pressure, the opening operation means is interrupted and the time The air conditioning operation mode change system according to claim 4, wherein the opening degree of the opening / closing mechanism of the first damper is maintained.   The time required for the second and third damper opening / closing mechanisms to be fully closed to fully open is in the range of 60 to 600 seconds, and in the closing operation means, the controller measures the indoor air pressure of the air conditioning chamber measured by the pressure sensor. When the change of the second and third dampers is slow, the closing speed of the opening and closing mechanisms of the second and third dampers is increased, and when the change of the indoor air pressure of the air conditioning chamber is abrupt, the closing speed of the opening and closing mechanisms of the second and third dampers The air-conditioning operation mode change system according to claim 4 or 5, wherein the opening / closing speed second changing means for slowing down is performed.   In the full outside air operation, the opening degree of the opening and closing mechanisms of the second and third dampers is kept fully open, and the closing operation means sets the opening degree of the opening and closing mechanisms of the second and third dampers in the fully opened state to 40. The air-conditioning operation mode changing system according to any one of claims 4 to 6, wherein the system is closed to -60%.   The air-conditioning room is a clean room, and in the air-conditioning operation mode changing system, fumigation with chemicals such as formalin and hydrogen peroxide is performed in the clean room after the air-conditioning apparatus is stopped and before the air-conditioning apparatus is started. Or the maintenance of the system is performed after the air conditioner is stopped until the air conditioner is started, and the all outside air operation is performed after the fumigation or after the maintenance. The air-conditioning operation mode change system according to any one of claims 1 to 7, wherein the switching operation is performed later.

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