JPH0827044B2 - Room pressure regulator for multiple rooms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention needs to perform room pressure control in order to maintain a clean atmosphere in a room, and conversely to prevent leakage of contaminated air to the outside. For room pressure regulators for multiple rooms used in certain fields (for example, pharmaceutical factories, biotechnology-related factories, LSI factories, various laboratories, etc.), see the main ventilation air passage connected to the ventilation fan. , A plurality of ventilation target chambers, each of the branch air passages branched from the main ventilation air passage is connected to each of the ventilation target chambers, a room pressure sensor for detecting a room pressure, an air passage flow rate The air volume adjusting means for adjusting the supply and exhaust gas balance of the ventilation target room by adjustment, and the air volume adjusting means for automatically maintaining the room pressure of the ventilation target room at a set value based on the detection information of the room pressure sensor. Provide room pressure control means to operate For multiple chambers chambers regarding pressure adjusting device.

[Conventional technology]

Conventionally, in the room pressure adjusting device for a plurality of rooms as described above,
As shown in FIG. 5, the room pressure control means (11A), (11B) based on the room pressure detection information by the room pressure sensors (9A), (9B).
The air volume adjusting means (10A) and (10B) (dampers in this example) that are automatically operated by the
The branch air passage (7) (in this example, the exhaust side branch air passage) connected to A) and (5B) was attached to each.

In the figure, (4) is a main exhaust air passage (exhaust side main ventilation air passage) connected to the exhaust fan (3), and (2) is a main air supply air passage connected to the air supply fan (1) (air supply side). The main ventilation duct).

Further, (8) is a damper device for setting the supply air volume to each ventilation target room (5A), (5B).

[Problems to be Solved by the Invention]

However, FIG. 6 shows changes in the room pressure and air flow in the conventional device shown in FIG. 5 (that is, the air flow rate adjusting means (10A), (10B) attached to the exhaust side branch air passage (7)). The operating form of the adjusting means and the changing form of the airway internal pressure (pressure at point P in FIG. 5) of the exhaust side main ventilation airway are shown. In the above-mentioned conventional device, as shown in (a) of FIG. To
The room pressure of one of the rooms (own room) falls below the set value for some reason (step 1), and the air flow rate adjustment means for that room is automatically operated by the room pressure control means based on the room pressure detection, and the air flow rate is set. When it is operated to the reduction side (exhaust air volume reduction side) (step 2), the airway internal pressure of the exhaust side main ventilation airway is reduced accordingly (step 3). Although there is no change in the flow rate adjustment state, the amount of exhaust gas from the other chambers increases, which causes the chamber pressures of the other chambers to decrease (step 4).

Then, in response to such a decrease in the room pressure of the other room, the air volume adjusting means of the other room is automatically operated by the room pressure control means based on the detection of the room pressure to operate on the air passage flow rate reducing side (step 5). However, the fact that the operation affects the direction in which the airway pressure in the exhaust side main ventilation airflow path is reduced (step 6) is due to the fact that the room pressure first decreased for some reason (the room itself). Affects the direction in which the room pressure of the room is reduced (step 7).

In other words, the room pressure adjustment control executed on the other room side as a result of the change in the room pressure of the other room due to the effect of the room pressure adjustment control on the room pressure change of the own room results in the original room of the own room. The direction in which the pressure change is promoted, in other words, the direction in which the control effect of the room pressure adjustment control for the original room pressure change in the own room is impaired, is affected as shown in FIG. 6 (b). The same applies to the case where the room pressure of any of the rooms changes to a higher side than the set value for some reason, and in the case where each of the air volume adjusting means for each room is attached to the air supply side branch air passage. This is also the case, and in this respect, the conventional device still has room for improvement in terms of the return of the room pressure to the set value.

An object of the present invention is to improve the room pressure returnability to a set value by rationally arranging the air volume adjusting means for each room.

[Means for solving the problem]

A characteristic configuration of a room pressure adjusting device for a plurality of rooms according to the present invention is to provide a main ventilation air passage connected to a ventilation fan, and for each of a plurality of ventilation target rooms, separate branch air passages branched from the main ventilation air passage. A room pressure sensor for detecting a room pressure for each of the ventilation target chambers, an air volume adjusting unit for adjusting the supply / exhaust flow rate balance of the ventilation target chamber by adjusting the air flow rate, and the room pressure sensor. In the configuration provided with a room pressure control means for automatically operating the air volume adjusting means so as to maintain the room pressure of the ventilation target room at a set value based on the detection information of the air volume adjusting means for one of the ventilation target rooms, Attached to the main ventilation air passage on the trunk side of each of the branch air passages, and attaching the air flow rate adjusting means for the other ventilation subject room to the branch air passage connected to the corresponding ventilation subject room. What you have done, The operation and effect of which is as follows.

[Action]

That is, for example, as shown in FIG. 3, the air volume adjusting means (10A) for one ventilation target chamber (5A) is provided on the exhaust side main ventilation air passage on the trunk side of each exhaust side branch air passage (7). Attached to (4), and other rooms subject to ventilation (5
B), (5C) air flow rate adjusting means (10B), (10C) is attached to the corresponding ventilation target room (5B), (5C) attached to the exhaust side branch air passage (7) (one of the present invention Application example)
The manner of changing the room pressure, the manner of operating the air volume adjusting means, and the manner of changing the pressure inside the air passage of the exhaust side main ventilation air passage (pressure at point Q in FIG. 3) are as shown in FIG.

That is, as shown in FIG. 2 (a), the room pressure of the room (5A) in which the corresponding air volume adjusting means (10A) is attached to the exhaust side main ventilation air passage (4) is lowered for some reason (step 1). Then, the air volume adjusting means (10A) for the chamber (5A) is automatically operated by the room pressure control means (11A) based on the detection of the room pressure to operate on the air passage flow rate reducing side (exhaust air volume reducing side) (step 2). However, since this air flow rate adjusting means (10A) is attached to the exhaust side main ventilation air passage (4), for this operation, the air passage of the exhaust side main ventilation air passage (4) at the point Q. The internal pressure rises (step 3), and the chamber pressures of the other chambers (5B) and (5C) change to the rising side (step 4) due to the rise of the internal pressure of the air passage.

Then, in response to such a rise in the room pressure of the other chambers (5B) and (5C), the air volume adjusting means (10B) attached to the exhaust side branch air passage (7) for the other chambers (5B) and (5C). ), (10C) is automatically operated by the room pressure control means (11B), (11C) based on the detection of the room pressure to operate on the air flow rate increasing side (step 5). It is the operation that affects the direction of increasing the air pressure in the ventilation air passage (4) (step 6), that is, the chamber in which the room pressure first dropped for some reason (that is, the corresponding air volume adjusting means (10A)). For the room (5A) attached to the exhaust side main ventilation air passage (7),
It affects the direction of increasing the chamber pressure of A) (step 7).

On the other hand, as shown in FIG. 2B, the chamber pressures of the chambers (5B) and (5C) provided with the corresponding air flow rate adjusting means (10B) and (10C) in the exhaust side branch air passage (7) are not certain. When it is lowered due to the cause (step 1), the air volume adjusting means (10B), (10C) for the room (5B), (5C) is automatically operated by the room pressure control means (11B), (11C) based on the room pressure detection. The air flow rate reduction side (exhaust air flow rate reduction side) is operated (step 2), but the air flow rate adjusting means (10B) and (10C) are provided on the exhaust side branch air channel (7).
Therefore, the airway internal pressure of the exhaust side main ventilation airway (4) at the point Q is reduced (step 3) for this operation, and it is necessary to cope with the decrease in the airway internal pressure. The room pressure of the room (5A) provided with the air volume adjusting means (10A) in the exhaust side main ventilation air passage (4) changes to the lower side (step 4).

Then, in response to the decrease in the room pressure of the chamber (5A) in which the air volume adjusting means (10A) is attached to the exhaust side main ventilation air passage (4) as described above, it is attached to the exhaust side main ventilation air passage (4). The air volume adjusting means (10A) of the room pressure side control means (11A) based on the room pressure detection.
The automatic operation by A) will operate to the air flow rate decrease side (step 5), but this operation will affect the direction to increase the airway internal pressure of the ventilation side main ventilation airway (4) (step 6). It is the operation that causes the chamber pressure drop to occur for some reason (that is, the corresponding air volume adjusting means (10
Room (5B) with B) (10C) attached to the exhaust side branch air passage (7)
(5C)) influences the direction of increasing the chamber pressure of the chambers (5B) and (5C) (step 7).

In short, a specific room with the corresponding air volume adjusting means (10A) attached to the exhaust side main ventilation air passage (4) and the corresponding air volume adjusting means (10B), (10C) are connected to the exhaust side branch air passage (7). In correspondence with the other rooms (5B) and (5C) attached to the room, the room pressure adjustment control influences the room pressure change of the specific one room (5A) and the room pressure of the other rooms (5B) and (5C). The room pressure adjustment control executed on the side of the other chambers (5B) and (5C) eventually suppresses the change in the room pressure of the specific room (5A). Direction, that is, the direction in which the control effect of the room pressure adjustment control with respect to the original room pressure change of the specific one room (5A) is promoted, and the room pressure of the other rooms (5B) and (5C) is also affected. The room pressure adjustment control executed on the side of the specific one chamber (5A) results in that the room pressure of the specific one chamber (5A) changes due to the influence of the room pressure adjustment control on the change. Of the chamber (5B), (5C)
Direction that suppresses the change in the original chamber pressure, that is, the other chamber (5
B) and (5C) influence the direction in which the control effect of the room pressure adjustment control with respect to the original room pressure change is promoted, and this affects the corresponding air volume adjusting means as shown in FIG. 2 (C). Specific 1 with (10A) attached to the exhaust side main ventilation air passage (4)
When the chamber pressure of the chamber (5A) changes to a higher side than a specific value for some reason, and as shown in Fig. 2 (d), the corresponding air volume adjusting means (10B), (10C) are connected to the exhaust side. The same applies to the cases where the room pressures of the other chambers (5B) and (5C) attached to the branch air passage (7) change to a higher side than the set value for some reason. As shown, an air volume adjusting means (10A) for one ventilation target room (5A) is attached to the air supply side main ventilation air path (2) on the trunk side of each air supply side branch air path (6). In addition, the air volume adjusting means (10B) for the other ventilation target room (5B) is attached to the air supply side branch air passage (6) connected to the corresponding ventilation target room (5B) (other than the present invention). The same applies to one application example).

〔The invention's effect〕

That is, according to the present invention, in the correspondence between the specific one room in which the corresponding air volume adjusting means is attached to the main ventilation air passage and the other room in which the corresponding air volume adjusting means is attached to the branch air passage, the room of its own room Although it is unavoidable that the room pressure of the other room changes due to the effect of the room pressure adjustment control on the pressure change, the room pressure adjustment control executed on the side of the other room against such room pressure change of the other room. However, contrary to the conventional device, by affecting the direction of suppressing the original room pressure change of the own room, that is, by promoting the control effect of the room pressure adjustment control for the room pressure change of the own room,
The return of the room pressure to the set value can be effectively improved as compared with the conventional apparatus, and the room pressure of each room can be stably maintained by the set room pressure.

〔Example〕

 Next, examples will be described.

FIG. 1 shows a ventilation configuration for a plurality of clean rooms, in which a main air supply air passage (2) connected to an air supply fan (1) and a main exhaust air passage (4) connected to an exhaust fan (3) are provided. For each of the clean rooms (5A), (5B), and (5C) of the air supply side branch air passage (6) branched from the main air supply air passage (2), and the main exhaust air passage (4) 2) is connected to each of the exhaust side branch air passages (7).

A damper device (8) for setting the distribution ratio of the air supply amount to each clean room (5A), (5B), (5C) is attached to each of the air supply side branch air passages (6), After setting the air supply distribution ratio in this way, each clean room (5
A), (5B), and (5C) are room pressures (P ₁ ), (P ₂ ), and (P ₂ )
It is to be maintained (P _3).

Of the clean rooms (5A), (5B), (5C), the main clean room (5
In A), the room pressure is set higher (P ₁ > P ₂ , P ₃ ) than in the other sub-coin rooms (5B) and (5C).

As a concrete room pressure control configuration, clean room (5
Room pressure sensors (9A), (9B), (9C) that detect the room pressure, and the air flow rate adjustment on the exhaust side to balance the supply and exhaust air volume of the room for each of A), (5B), and (5C). Air flow rate adjustment means (10
A), (10B), (10C), and room pressure sensor (9A),
Based on the room pressure detection information from (9B) and (9C), the air volume adjusting means (10) is used to maintain the room pressure at the set value (P ₁ , P ₂ , P ₃ ).
Room pressure control circuit (1) that automatically operates A), (10B), and (10C)
1A), (11B), and (11C) are provided.

Then, motor dampers are applied to the air flow rate adjusting means (10B), (10C) for the sub clean rooms (5B), (5C), and these motor dampers (10B), (10C) are replaced with the corresponding sub clean rooms (5B), (5C). ) Is connected to the exhaust side branch air passage (7).

Further, as the air volume adjusting means (10A) for the main clean room (5A), an exhaust side inverter control circuit for adjusting the air flow rate of the exhaust fan (3) by inverter control is provided, and the exhaust air by the exhaust side inverter control circuit (10A) is provided. The supply and discharge balance of the main clean room (5A) is adjusted by adjusting the air flow rate of the fan (3).

In other words, the air volume adjusting means (10A) for the main clean room (5A) is attached to the main exhaust air passage (4) on the trunk side of the branch sides of the exhaust side branch air passages (7), and the auxiliary clean room Each of the air volume adjusting means (10B) and (10C) for (5B) and (5C) is attached to the exhaust side branch air passage (7) connected to the corresponding sub-clean room (5B) and (5C). .

That is, as described above, the air volume adjusting means (10A), (10B),
By providing (10C), in the correspondence between the main clean room (5A) and the sub-clean rooms (5B), (5C) that affect each other in terms of room pressure adjustment via the main exhaust air passage (4), As shown in Figure (a) or (c), the sub-clean rooms (5B), (5C) are affected by the room pressure adjustment control (step 2) (step 3) on the room pressure change (step 1) in the main clean room (5A). ) Change the chamber pressure (step 4) against the secondary clean room (5
The room pressure adjustment control (step 5) executed on the side of B), (5C) consequently affects the direction of suppressing the original room pressure change (step 1) of the main clean room (5A) (step 6,
7) and as shown in Fig. 2 (b) or (d), either of the secondary clean rooms (5B) and (5C).
The effect of the room pressure adjustment control (step 2) on the room pressure change (step 1) of the main clean room (5)
The room pressure adjustment control (step 5) executed on the side of the main clean room (5A) against the change of the room pressure of (A) (step 4) results in the auxiliary clean room (5).
B), (5C) side is designed to influence (steps 6, 7) the direction of suppressing the original room pressure change (step 1), and thereby, each clean room (5A), (5B),
(5C) In each case, the room pressure return to the set value (P ₁ , P ₂ , P ₃ ) when the room pressure changes for some reason is improved.

Further, when one air volume adjusting means is attached to the main exhaust air passage (4), the air volume adjusting means (10A) for the main clean room (5A) is attached to the main exhaust air passage (4). ), The above-mentioned favorable influence in the direction of suppressing the change in the room pressure of the own room is received from all the other sub-clean rooms (5B) and (5C), thereby maintaining the clean atmosphere. Compare the room pressure recoverability of the main clean room (5A) that has the highest importance (in other words, the importance of maintaining room pressure is the highest) to the room pressure recoverability of the other sub-clean rooms (5B) and (5C). It is more expensive.

In the figure, (12) is the room pressure control circuit (11A), (11B), (11
C) is incorporated into the central control unit, but this central control unit (12) has a pre-programmed ventilation operation schedule or an operation command given by the driver.
It is equipped with a ventilation operation integrated control circuit (13) that changes and adjusts the ventilation volume for each clean room (5A), (5B), (5C) according to the usage conditions of the clean room. The air flow rate of the air supply fan (1) is automatically adjusted by a command given from the circuit (13) to the air supply side inverter control circuit (14), and along with that, the room pressure sensors (9A), (9B), Based on the room pressure detection information of (9C), each air volume adjusting means (exhaust side inverter control circuit (10
A), motor damper (10B), (10C)) are automatically operated by the room pressure control circuits (11A), (11B), (11C), so that each clean room (5A), (5B), (5C) The total exhaust amount is adjusted to match the total supply amount in the direction of maintaining the room pressure at the set values (P ₁ ), (P ₂ ), (P ₃ ), so that each clean room (5A), (5B), ( The ventilation volume of 5C) is adjusted according to the usage condition of the clean room.

In addition, based on the detection information of the room pressure sensors (9A), (9B), (9C), the room pressure control circuits (11A), (11B), (11C) are provided with air volume adjusting means (10A), (10B), (10C). The so-called PID control is applied to the aforementioned room pressure adjustment control for automatically operating
Adjustment speed of the air supply fan air flow rate adjustment executed by the ventilation operation integrated control circuit (13) (change speed of air supply fan air flow rate)
Is defined as a speed sufficiently slower than the response speed of the room pressure adjustment control, so that the room pressure fluctuation of each clean room (5A), (5B), (5C) caused by the change of the air supply amount. It is designed to suppress and prevent.

Further, while the room pressure adjustment control for the main clean room (5A) is performed by adjusting the air passage flow rate of the main exhaust air passage (4), the sub clean room (5B) is performed by adjusting the air passage flow rate of the exhaust side branch air passage (7). ), (5C), to give uniqueness to the room pressure adjustment control, a sub-clean room (5B),
Room pressure adjustment control for (5C) is the main clean room (5A)
The response speed is faster than the room pressure adjustment control.

Further, in order to make the exhaust fan (3) rise smoothly with respect to the rise of the air supply fan (1) at the start of the ventilation operation (that is, to make the rise of the ventilation operation smooth), In order to prevent large interference between the room pressure adjustment control for the main clean room (5A) and the room pressure adjustment control for the sub clean rooms (5B), (5C) under unstable conditions at the start, ventilation operation is started. Sometimes the motor damper (10B), (10
With the C) fully open, the sub-clean room (5B),
The room pressure adjustment control for (5C) is made to wait, and the room pressure adjustment control for the sub-clean rooms (5B), (5C) is started after a lapse of a predetermined period when the rise of the ventilation operation is almost completed.

Selecting the air flow rate adjusting means (10A) for the main clean room (5A) as the air flow rate adjusting means attached to the main exhaust air passage (4) is the control of room pressure adjustment for the main clean room (5A) where maintaining the room pressure is highly important. Is also effective in the sense of prioritizing room pressure adjustment control for the sub-clean rooms (5B) and (5C) at the start of ventilation operation.

In the figure, (15) and (16) are the clean rooms (5A),
Each branch air passage (6) when fumigating (5B) and (5C),
It is a damper for closing (7), and (17) opens the return air passage (18) during normal ventilation operation, and after fumigation treatment, fumigation gas is ventilated to each clean room (5).
Return air passage (18) when discharging from A), (5B), (5C)
Is a damper that closes.

[Another embodiment]

 Next, another embodiment will be listed.

(B) As shown in FIG. 4, the air volume adjusting means (10A) for one ventilation target room (5A) is provided on the air supply side main ventilation air passage (2).
The air volume adjusting means (10B) for the other ventilation target room (5B) may be attached to the air supply side branch air passage (6) connected to the corresponding ventilation target room (5B).

(B) As shown in FIGS. 4 and 3, the main ventilation air passage (2)
Alternatively, a damper device may be applied as the air volume adjusting means (10A) attached to (4).

(C) The number of ventilation target rooms may be two or more.

(D) The use of each ventilation target room is not critical, and the room pressure maintained by the room pressure adjustment control may be either positive pressure or negative pressure.

(E) Which of the plurality of ventilation target rooms is to be provided with the air volume adjusting means in the main ventilation air passage may be appropriately determined.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram, and FIGS. 2 (a), (b), (c), and (d) show changes in various places. It is a table shown. FIG. 3 and FIG. 4 are schematic configuration diagrams showing another embodiment of the present invention. FIG. 5 is a schematic configuration diagram of a conventional device, and FIG.
(B) is a table showing changes in various places in the conventional apparatus. (3) …… Ventilation fan, (4) …… Main ventilation air passage, (5
A), (5B), (5C) ... Ventilation target room, (7) ... Branch air passage, (9A), (9B), (9C) ... Room pressure sensor, (10
A), (10B), (10C) ... Air volume adjustment means, (11A),
(11B), (11C) ... Room pressure control means, (P ₁ ), (P ₂ ),
(P ₃ ) …… Set room pressure.

Claims (3)

[Claims] 1. A main ventilation air duct (4) connected to a ventilation fan (3) is provided, and a plurality of ventilation target rooms (5A), (5B), (5) are provided.
Each of C) is connected to a separate branch air duct (7) branched from the main ventilation air duct (4), and the ventilation target room (5A),
Room pressure sensors (9A), (9B), (9C) for detecting room pressures for (5B) and (5C), and the ventilation target rooms (5A), (5B), by adjusting the air flow rate. The air volume adjusting means (10A), (10B), (10C) for adjusting the supply and exhaust gas balance of (5C), and the ventilation based on the detection information of the room pressure sensors (9A), (9B), (9C). The air volume adjusting means (10A), (10B), so as to maintain the room pressures of the target chambers (5A), (5B), (5C) at the set values (P ₁ ), (P ₂ ), (P ₃ ). A room pressure adjusting device for a plurality of rooms provided with room pressure control means (11A), (11B), (11C) for automatically operating (10C), wherein the air volume adjusting means for one ventilation target room (5A) (10A) is attached to the main ventilation air passage (4) on the trunk side of each of the branch air passages (7), and the other ventilation target room (5).
B), (5C), the air flow rate adjusting means (10B), (10
A chamber pressure adjusting device for a plurality of chambers, wherein C) is attached to the branch air passage (7) connected to the corresponding ventilation target chambers (5B) and (5C). 2. The air volume adjusting means (10A) for the one (5A) of the ventilation target rooms (5A), (5B), (5C) for which the importance of maintaining the room pressure is the highest, the main ventilation air passage ( The chamber pressure adjusting device for a plurality of chambers according to claim 1, which is attached to 4). 3. The air volume adjusting means (10A) attached to the main ventilation air passage (4) executes air passage flow rate adjustment by adjusting the ventilation capacity of the ventilation fan (3).
Or the room pressure adjusting device for a plurality of rooms according to 2.