JPH01256743A - Room pressure regulating device for plurality of rooms - Google Patents

Abstract

PURPOSE:To prevent fluctuation of pressure inside rooms to be ventilated by a method wherein a hold control means to suppress the sudden change of a flow rage regulating state is provided in an automatic flow rate regulating means for ventilating rooms the external communication port of which is opened. CONSTITUTION:A hold control circuit 19 to perform control operation in an interlocking manner is situated to a controller 12 of an automatic flow rate regulating means 9. Since, when an external communication port 17 of some clean room 5 is opened, room pressure in the clean room 5 is suddenly widely changed, the automatic flow rate regulating means 9 is widely actuated according to a change in a detecting room pressure, and the flow rate regulating state (a motor damper 10) of the automatic flow rate regulating means 9 is suddenly widely changed. The hold control circuit 19 for the automatic flow rate regulating means 9 of the clean room 5 an external communication port 17 of which is opened suppresses and prevents the fluctuation of even the room pressure of other clean rooms 5 due to sudden change in the inner pressure of an air duct in a main discharge air duct 4 occasioned by the sudden change.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides room pressure control in order to maintain a clean cloud atmosphere indoors or conversely to prevent contaminated air from leaking outside. Regarding the room pressure adjustment device for multiple rooms used in fields where it is necessary (for example, pharmaceutical factories, biotechnology-related factories, LSI factories, various laboratories, etc.), please refer to the main ventilation air path connected to the ventilation fan. A separate branch air path branched from the main ventilation air path is connected to each of the plurality of rooms to be ventilated, and a connection is made to each of the branch air paths based on the detection of the room pressure of the connected room to be ventilated. A plurality of rooms equipped with an automatic air volume adjustment means for room pressure control that automatically adjusts the flow air volume of the branch air path so that the room pressure of the room to be ventilated is maintained at a set value by adjusting the supply/exhaust volume balance of the room. The present invention relates to a room pressure adjustment device.

[Conventional technology]

Conventionally, as shown in Fig. 4, a main air supply air path (2) (main ventilation air path on the air supply side) connected to an air supply fan (1) is branched off to each of multiple ventilation target rooms (5). Each of the plural ventilation target rooms (5) is branched from the connected supply side branch air path (6) and the main exhaust air path (4) (exhaust side main ventilation air path) connected to the exhaust fan (3). Based on the room pressure detection of the connected ventilation target room (5), one of the exhaust side branch air passages (7) connected to the exhaust side branch air passages (6) and (7) is connected to the connected ventilation target room (5). Automatically adjusts the flow rate of the branch air passage (exhaust side branch air passage (7) in this example) so that the room pressure of the room (5) is maintained at the set value by adjusting the air supply/exhaust flow balance of that room (5). Automatic air volume adjustment means (9) for room pressure control are provided, and the room pressure of each room to be ventilated (5) is constantly controlled by the automatic air volume adjustment means (9) during ventilation operation. It is configured to maintain a set room pressure.

In the figure, (10) is a motor damper, (11) is a room pressure sensor, and (12) is a controller that automatically operates the motor damper (10) based on the detection information of the room pressure sensor (11). 9) are these motor dampers (10
), a room pressure sensor (11), and a controller (12) as the main components.

(8) is a constant air volume device installed in each of the air supply side branch air passages (6), and these constant air volume devices (8) set the amount of air supplied to each room to be ventilated (5). Maintained at supply air volume.

Further, (17) is an external communication port (mainly an entrance/exit) with an opening/closing door for each ventilation target room (5).

[Problem to be solved by the invention]

However, in the above-mentioned conventional configuration, the external communication port of each ventilation target room is normally closed to maintain room pressure, but if the external communication port of one of the ventilation target rooms is closed for some reason during room pressure control. When it is opened (see Figure 5), the pressure in the room to be ventilated changes rapidly and the automatic air volume adjustment means for the room to be ventilated operates greatly in response to the change in detected room pressure. However, as a result, the flow rate adjustment state of the automatic landscape adjustment means suddenly changes greatly.

However, although it is unavoidable that the room pressure in a room to be ventilated with an open external communication port fluctuates, the air flow rate adjustment state of the automatic air volume adjustment means for a room to be ventilated with an open external communication port may suddenly change significantly. Then, if the flow rate of the connecting branch air passage to the room to be ventilated changes suddenly and greatly,
Due to this, the air duct internal pressure of the main ventilation air duct (main exhaust air duct (4) in the example shown in Fig. 4) also changes rapidly and greatly, and the air duct internal pressure in this main ventilation air duct changes rapidly. There is a problem in that this causes a large disturbance to the room pressure control in other rooms to be ventilated, and the room pressures in other rooms to be ventilated also fluctuate.

In other words, due to a sudden large change in the air duct internal pressure of the main ventilation air duct due to the opening of the external communication port of one of the rooms to be ventilated, the flow of automatic air volume adjustment means to other rooms to be ventilated may be affected. Even though there is no change in the air volume adjustment state, the air flow volume of the connecting branch air path to those other rooms to be ventilated has changed, and as a result, the air supply and exhaust volume balance of the other rooms to be ventilated has changed. The room pressure in other rooms to be ventilated will also fluctuate, and in this respect, it is difficult to achieve the original purpose of room pressure control, which is to maintain the room pressure in each room to be ventilated as stably as possible at the set room pressure. There was still room for improvement.

An object of the present invention is to effectively suppress and prevent, through rational improvement, the room pressures of other ventilation target rooms also fluctuating due to the opening of the external communication port.

[Means to solve the problem]

The characteristic configuration of the room pressure adjustment device for multiple rooms according to the present invention is that a main ventilation air path connected to a ventilation fan is provided, and each of the plurality of rooms to be ventilated is provided with a separate branch air path branching from the main ventilation air path. and to each of these branch air paths, based on the detected room pressure of the connected room to be ventilated, the room pressure of the connected room to be ventilated is maintained at the set value by adjusting the supply/exhaust volume balance of that room. In the configuration in which an automatic air volume adjustment means for room pressure control is provided to automatically adjust the air flow volume of the branch air passage, an opening/closing detection means for detecting an open/closed state of an external communication port in each of the ventilation target rooms is provided, and the opening/closing detection means is provided. Based on the detection information from the means, when the external communication port is opened from the steady room pressure control state in which the external communication port is closed, the The present invention is based on the provision of a holding control means that automatically performs holding control on the automatic air volume adjusting means so as to suppress sudden changes in the circulating air volume adjustment state, and its functions and effects are as follows. .

[For production]

In other words, since it is unavoidable that the room pressure in a room to be ventilated with an open external communication port fluctuates, the automatic air volume adjustment means for the room to be ventilated with an open external communication port should be adjusted depending on the opening of the external communication port. It is practically meaningless to adjust the flow rate in response to the resulting change in room pressure.

Therefore, from this point of view, based on the detection of the open/closed state of the external communication port, when the external communication port is opened from the steady room pressure control state with the external communication port closed, the ventilation target for which the external communication port is opened The automatic air flow rate adjustment means for the chamber is automatically controlled by the holding control means to suppress sudden changes in the flow rate adjustment state in response to sudden changes in the detection chamber pressure caused by the opening of the external communication port. If a holding control action is applied to the ventilation target room, even if the external communication port of one of the rooms to be ventilated is opened, the flow rate of the air flow in the branch air passage connected to that room will not change drastically, and the main ventilation Since the air duct internal pressure of the air passage does not change suddenly, the room pressure of other rooms to be ventilated is maintained stably.

〔Effect of the invention〕

As a result, compared to conventional equipment in which when the external communication port of any ventilation target room is opened, the room pressure of other ventilation target rooms also fluctuates, the room pressure of each ventilation target room can be reduced as a whole. The room pressure can be maintained stably by setting each room pressure,
As a result, it is now possible to more reliably maintain a clean atmosphere in each room to be ventilated and prevent leakage of contaminated air from each room to be ventilated by controlling the room pressure.

〔Example〕

Next, an example will be described.

Figure 1 shows the ventilation configuration for multiple clean rooms.
a main air supply air path (2) connected to the air supply fan (1), and
A main exhaust air passage (4) connected to an exhaust fan (3) is provided,
For each of the plurality of clean rooms (5), there are separate air supply side branch air passages (6) branched from the main air supply air passage (2), and separate air supply side branch air passages (6) branched from the main exhaust air passage (4). The exhaust side branch air passage (7) is connected.

Each clean room (
A constant air flow device (8) is installed to maintain the supply air 1 at a set air supply amount for each of the exhaust air ducts (7), while a connected clean room (5) A room that automatically adjusts the flow rate of air in the exhaust side branch air passage (7) so as to maintain the room pressure of the connected clean room (5) at the set room pressure by adjusting the supply/exhaust balance of that room based on the room pressure detected in the room. Automatic air volume adjustment means (9) for pressure control is provided.

In other words, the room pressure of each clean room (5) is adjusted according to the required cleanliness level by maintaining the air supply volume using the constant air volume device (8) and adjusting the exhaust volume using the automatic air volume adjustment means (9) based on room pressure detection. Each set room pressure (P, ), (P2),
(pt).

The automatic air volume adjustment means (9) includes a motor damper (10) for adjusting the flow air volume installed in the exhaust side branch air passage (7), a room pressure sensor (11) that detects the room pressure of the clean room (5),
The main component is a controller (12) that automatically operates the motor damper (10) based on information detected by the room pressure sensor (11).

Specifically, the room pressure sensor (11) detects the pressure difference between the indoor pressure and the outdoor pressure of the clean room (5), and the room pressure control by the automatic air volume adjustment means (9) is based on this difference. This is to maintain the pressure at the set differential pressure.

In addition, so-called PID control is applied to the opening degree control of the motor damper (10) using human power based on the detection chamber pressure (differential pressure), which is executed by the controller (12) in the automatic air volume adjustment means (9).

(13) and (14) in the figure indicate each clean room (5)
This damper is used to shut off the branch air passages (6) and (7) when fumigating the air.
This is a local supply/exhaust device connected to an exhaust fan (16).

As ancillary control equipment for the room pressure control configuration as described above,
Each clean room (5) is equipped with an opening/closing door sensor (18) that detects the opening/closing state of the external communication port (17) (mainly the entrance/exit) in each room (5). Based on the detection information of, when the external communication port (17) is opened from the steady room pressure control state where the external communication port (17) is closed, the clean room ( 5) of the automatic air volume adjustment means (9) (i.e., the opening degree of the motor damper (10)) regardless of the sudden change in the detection chamber pressure caused by the opening of the external communication port (17). 17) is opened, and while the external communication port (17) is in the open state, the maintained state is continued, and the external communication port (
17) is closed, automatic air flow adjustment based on the room pressure detection of the automatic air volume adjustment means (9), which was subject to maintenance control, is performed, and differential pressure detection information of the room pressure sensor (11) during maintenance control is performed. The controller (12) of the automatic air volume adjustment means (9) is configured to ignore the automatic air flow adjustment means (9) and restart it in a state that continues with the previous automatic air flow adjustment until the external communication port (17) was opened.
A holding control circuit (which acts in an interlocking manner)
19) is provided.

In other words, when the external communication port (17) of any clean room (5) is opened, that clean room (5)
Because the room pressure in the clean room (5) changes rapidly and greatly, the automatic air volume adjustment means (9) for the clean room (5) operates greatly in response to the change in the detected room pressure, causing the automatic air volume adjustment means (9) to
9) The circulating air volume adjustment state (motor damper) suddenly changes greatly, and the other Fluctuations in the room pressure of the clean room (5) are suppressed and prevented by the above-mentioned maintenance control of the automatic air volume adjustment means (9) of the clean room (5) in which the external communication port (17) is opened. That's what I do.

In addition, there is a clean room (5) with an external communication port (17).
) of the automatic air volume adjustment means (9) while the external communication port (17) is in the open state. At the same time, when the external communication port (17) is closed, the room pressure sensor (11) during the holding control is
) The automatic air flow rate of the automatic air flow adjustment means (9) based on the room pressure detection is continued in the state in which the air flow rate is automatically adjusted in advance until the external communication port (17) is opened, ignoring the room pressure detection information of ). By restarting the adjustment, in other words, in this configuration in which PID control is adopted for room pressure control, the distribution air volume adjustment state of the automatic air volume adjustment means (9) due to manual integration during holding control is unnecessary when automatic adjustment is restarted. By restarting the automatic flow rate adjustment based on the room pressure detection while preventing the room pressure from being changed, the room pressure of the clean room (5) can be smoothly adjusted to the set value when the external communication port (17) is closed. Also, it is possible to recover without adversely affecting the room pressure control of other clean rooms (5).

Incidentally, FIG. 2 shows changes in various parts when holding control as described above is performed, whereas FIG. 5 shows changes in various parts when holding control is not performed.

On the other hand, for the supply/exhaust fan (16) of the local supply/exhaust device (15), when the local supply/exhaust fan (16) is started, the local supply/exhaust volume is gradually adjusted to the rated air volume along a predetermined gradient. a local air supply/exhaust controller (20) that controls the air supply/exhaust fan (16) using an inverter so that the air supply/exhaust fan (16) increases the amount of air, and gradually decreases the local air supply/exhaust amount from the rated air volume along a predetermined change gradient when stopped. This local supply/exhaust control allows the room pressure control based on room pressure detection to follow without delay even when local supply/exhaust is started and stopped, so that the room pressure can be maintained stably.

[Another example]

Next, another example will be listed.

(B) When an external communication port is opened, the flow rate adjustment state of the automatic air volume adjustment means for controlling room pressure for the room to be ventilated to which the external communication port is opened is caused by the opening of the external communication port. In order to cause the holding control means to perform automatic holding control so as to suppress sudden changes in response to sudden changes in the detected differential pressure, the form of holding control is to control the automatic air volume adjustment means that is subject to holding control. Shifts the distribution air volume adjustment state toward one side limit value of the air volume adjustment range (i.e., the branch air passage fully closed side or fully open side) at a predetermined speed that is sufficiently lower than the adjustment operation speed of other automatic air volume adjustment means. and when the external communication port is closed, the automatic distribution air volume adjustment based on the room pressure detection of the automatic air volume adjustment means, which was subject to maintenance control, is performed. The air volume adjustment state may be reset and restarted at a predetermined speed that is sufficiently lower than the adjustment operation speed of other automatic air volume adjustment means.Furthermore, Fig. 3 shows the state when this holding control mode is adopted. Shows variations in various places.

(b) The present invention can also be applied to a device in which automatic air volume adjustment means is provided in the air supply side branch air path.

(c) External communication opening is a general term for the entrance for workers, the entrance for goods only, etc.

(d) The room pressure maintained by room pressure control may be either positive pressure or negative pressure.

(e) Functions of the controller in each automatic air volume adjustment means;
Furthermore, the functions of each holding control means (circuit) may be executed by one central control device.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a schematic configuration diagram and FIG. 2 being a diagram showing a modified form. FIG. 3 is a diagram showing a variation when another embodiment of the present invention is adopted. 4 and 5 show a conventional example, FIG. 4 is a schematic configuration diagram, and FIG. 5 is a diagram showing a modified form. (3)...Ventilation fan, (4)...Main ventilation air path, (5)...Room to be ventilated, (7)...
... Branch air path, (9) ... Automatic air volume adjustment means, (17) ... External communication port, (18) ...
...opening/closing detection means, (19)...holding control means.

Claims (1)

[Claims] 1. A main ventilation air path (4) connected to a ventilation fan (3) is provided, and each branched from the main ventilation air path (4) is provided to each of the plurality of ventilation target rooms (5). Another branch air path (7) is connected, and the room pressure of the connected ventilation target room (5) is adjusted to each of the branch air paths (7) based on the room pressure detection of the connected ventilation target room (5). A plurality of automatic air volume adjustment means (9) for controlling room pressure that automatically adjusts the air flow volume of the branch air passage (7) so as to maintain the set value by adjusting the air supply/exhaust balance of the room (5). The room pressure adjustment device is provided with an opening/closing detection means (18) for detecting the opening/closing state of the external communication port (17) in each of the rooms (5) to be ventilated. Based on the detection information, the external communication port (17) is changed from the steady room pressure control state where the external communication port (17) is closed.
17) is opened, the distribution air volume adjustment state of the automatic air volume adjustment means (9) for the ventilation target room (5) to which the external communication port (17) is opened suddenly changes. A room pressure adjustment device for multiple chambers provided with a holding control means (19) that automatically performs holding control so as to suppress. 2. The holding control means (19) changes the circulating air volume adjustment state of the automatic air volume adjusting means (9) that is subject to holding control while the external communication port (17) is in the open state. 17) is opened, and when the external communication port (17) is closed, the automatic air volume adjustment means (9), which was subject to maintenance control,
) is automatically adjusted based on the room pressure detection of the external communication port (17), ignoring the room pressure detection information during the holding control.
2. The room pressure adjustment device for multiple chambers according to claim 1, wherein the automatic air flow rate adjustment is resumed in a state in which the air flow rate is restarted in succession to the time when the air flow rate adjustment device is opened. 3. The holding control means (19) controls the distribution air volume adjustment state of the automatic air volume adjustment means (9) that is subject to holding control.
When the air volume adjustment range is shifted toward one side limit value at a predetermined speed lower than the adjustment operation speed of the other automatic air volume adjustment means (9), and the external communication port (17) is closed. , the automatic air flow rate adjustment based on the room pressure detection of the automatic air volume adjustment means (9), which was subject to the holding control, is changed to the flow air volume adjustment state in which the air flow rate adjustment state has shifted toward one side limit value by the holding control, and the automatic air flow adjustment state is changed to the other automatic air volume adjustment state. 2. The room pressure adjustment device for multiple chambers according to claim 1, wherein the device returns and restarts at a predetermined speed lower than the adjustment speed of the means (9).