JPH0544575B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The first and second inventions relate to air conditioners installed in rooms to be ventilated for various uses such as clean rooms that require room pressure control. interposing a first damper in a forced ventilation air path connected to the target room for adjusting the air supply and exhaust volume balance of the ventilation target room by adjusting the ventilation volume and adjusting the room pressure of the ventilation target room;
The present invention relates to an air conditioner including a room pressure controller that adjusts the opening degree of the first damper based on the room pressure detected in the room to be ventilated by a room pressure sensor so as to maintain the detected room pressure at a set value.

[Conventional technology]

Conventionally, in the above-mentioned air conditioners, the room pressure in the room to be ventilated can be brought to the set value simply by adjusting the opening of a single damper (first damper) installed in the forced ventilation air path according to the detection. It had a room pressure control configuration that regulated and maintained it.

[Problem to be solved by the invention]

However, when controlling the room pressure by adjusting the opening of a single damper, the room pressure in the room to be ventilated may fluctuate greatly due to the occurrence of some room pressure fluctuation factor, or the air path resistance of the forced ventilation air path may If the pressure in the room to be ventilated increases significantly due to clogging of the ventilation filter, etc., the damper opening degree will be changed significantly by the room pressure controller to adjust and maintain the room pressure in the room to be ventilated at the set value, and then the normal minute room pressure In response to fluctuations, the room pressure will be adjusted and maintained at the set value by adjusting the damper opening near the greatly changed opening until the above-mentioned room pressure fluctuation factors and increased air path resistance are resolved. , the damper has a characteristic that the airflow rate changes non-proportionally as the opening degree changes, as shown by the broken line and solid line in Figure 5, so if the damper opening degree is changed significantly, Accordingly, even the supply/exhaust volume balance adjustment characteristic of the damper for the room to be ventilated (the rate of change in the ventilation volume Q with respect to a unit change in the damper opening degree c) changes significantly.

However, the fact that the adjustment characteristics of the air supply/exhaust volume balance changes greatly depending on the opening state of the damper means that
Room pressure adjustment characteristics differ greatly between room pressure adjustment for normal minute room pressure fluctuations when the damper opening is large and room pressure adjustment for normal minute room pressure fluctuations when the damper opening is small. In other words, the state before a large room pressure fluctuation due to the occurrence of some room pressure fluctuation factor or a large increase in air path resistance due to filter clogging, etc., and the condition after the occurrence of such room pressure fluctuation factors and air path resistance. If the increase is not resolved, the room pressure adjustment characteristics for normal small room pressure fluctuations will change significantly, and this will cause hunting and decreased responsiveness in normal room pressure control for small room pressure fluctuations. For this reason, it has been difficult to stably and accurately adjust and maintain the room pressure in the room to be ventilated to the desired set value, for example, causing contaminated air to enter the clean room, There was a problem in that a sufficient reliability system was not yet obtained in order to achieve the intended purpose of preventing harmful gas leaks from the experimental room by controlling the room pressure.

In addition, we have ensured a wide range of response for room pressure control to prevent large room pressure fluctuations caused by some room pressure fluctuation factors and large increases in resistance in the forced ventilation air path due to filter clogging, etc. In order to stabilize and improve the accuracy of room pressure control against small room pressure fluctuations while maintaining the room pressure control function, the first damper, whose opening is adjusted by a room pressure controller based on room pressure detection, is The detection chamber pressure and the first It is also conceivable to control the capacity of the forced ventilation fan in parallel based on the detection of the damper opening.

In other words, in response to large room pressure fluctuations or large increases in air resistance, the air supply and exhaust volume balance of the room to be ventilated can be basically adjusted by controlling the capacity of the forced ventilation fan based on the detected room pressure and the opening degree of the first damper. By adjusting the opening degree of the first damper, that is, by keeping the variation range of the supply/exhaust volume balance adjustment characteristic within a small range, the The purpose of this invention is to stabilize room pressure control against minute room pressure fluctuations, which is normally performed by adjusting the opening of one damper, and to improve accuracy.

However, even if the adjustment of air supply and exhaust volume balance by controlling fan capacity is basic, it is not possible to obtain sufficient adjustment accuracy and responsiveness due to the inherent characteristics of fan capacity control. However, even in this room pressure control mode, there is still a problem that satisfactory room pressure controllability cannot be obtained.

The purpose of the first and second inventions is to ensure a sufficiently wide range of room pressure control by rationally adjusting the airflow volume in the forced ventilation air path, that is, by rationally adjusting the air supply and exhaust volume balance for the room to be ventilated. Meanwhile, stabilization of room pressure control against normal minute room pressure fluctuations, and
The aim is to improve accuracy.

[Means to solve the problem]

(First Invention) The characteristic configuration of the air conditioner according to the first invention is such that a forced ventilation air path connected to a room to be ventilated is connected to a forced ventilation air path connected to a room to be ventilated, and the air conditioner is connected to a forced ventilation air path connected to a room to be ventilated. A first damper is interposed to adjust the room pressure of the ventilation target room, and the opening degree of the first damper is adjusted to maintain the detected room pressure at a set value based on the room pressure detected by the room pressure sensor in the room to be ventilated. In the configuration in which a room pressure controller for adjustment is provided, a second damper is installed in the forced ventilation air path in series with the first damper to adjust the supply and exhaust amount balance of the room to be ventilated by adjusting the ventilation amount. The first damper is configured to have a structure that cannot be closed completely or close to fully closed, and the detection by the room pressure sensor is configured so that the room pressure adjustment function by adjusting the opening degree of the first damper is maintained. A basic room pressure controller is provided that adjusts the opening degree of the second damper based on the room pressure or based on the detection of the opening degree of the first damper.

(Second invention) The characteristic configuration of the air conditioner according to the second invention is such that a forced ventilation air path connected to a room to be ventilated is connected to a forced ventilation air path connected to a room to be ventilated to adjust the supply and exhaust amount balance of the room to be ventilated by adjusting the ventilation volume. A first damper is interposed to adjust the room pressure of the ventilation target room, and the opening degree of the first damper is adjusted to maintain the detected room pressure at a set value based on the room pressure detected by the room pressure sensor in the room to be ventilated. In the configuration in which a room pressure controller for adjustment is provided, a second damper is installed in the forced ventilation air path in series with the first damper to adjust the supply and exhaust amount balance of the room to be ventilated by adjusting the ventilation amount. However, in order to prevent the first damper from being fully closed or close to fully closed, or fully open or close to fully open, a Based on this, a basic room pressure controller is provided to adjust the opening degree of the second damper.

[Effect]

(First invention) In other words, in the characteristic configuration of the first invention described above,
By configuring the first damper in a structure that makes it impossible to close it completely or close to fully closed, the adjustable opening range of the first damper itself is limited to a small range on the damper structure (for example, in Figure 5, the broken line By disabling the opening adjustment to the area indicated by , the adjustable opening range is limited to the area shown by the solid line in Figure 5), and thereby the entire adjustable opening range is 1st
Even if the damper opening is changed by adjusting the opening with the room pressure controller, the supply/exhaust volume balance adjustment characteristics of the first damper for the room to be ventilated (rate of change in ventilation volume per unit change in damper opening) Try not to change too much.

The opening of the second damper, which is installed in the forced ventilation air path in series with the first damper, is adjusted so that the room pressure adjustment function by adjusting the opening of the first damper is maintained. In response to large room pressure fluctuations due to the occurrence of fluctuation factors or large resistance increases in the forced ventilation air path due to filter clogging, etc., the opening of the first damper is adjusted as described above in order to adjust the opening using the room pressure controller. In order to prevent the room pressure adjustment function of the first damper from being impaired due to the lower limit opening degree or upper limit opening degree of the possible range being reached, the first damper By adjusting the opening of the second damper using a basic room pressure controller based on the detection of the opening of the first damper, the aforementioned fan capacity control can be applied in response to large room pressure fluctuations and large increases in air resistance. Instead of basic adjustment of the air supply/exhaust volume balance by fan capacity control in the room pressure control mode that is carried out in parallel, this is handled by basically adjusting the air supply/exhaust volume balance by adjusting the opening degree of the second damper. After a large change in room pressure occurs due to some room pressure fluctuation factor or a large increase in resistance in the forced ventilation air path due to filter clogging, etc.
Even in the case of normal small room pressure fluctuations in a state where these room pressure fluctuation factors and increased air path resistance have not been resolved, the opening of the first damper can be adjusted within the adjustable opening range, which is limited to a small range as described above. It is possible to adjust and maintain the room pressure at a set value by adjusting the supply/exhaust volume balance through adjustment.

(Second invention) On the other hand, in the characteristic configuration of the second invention described above, the first invention
The opening of the second damper, which is installed in series with the damper in the forced ventilation air path, is adjusted so that the first damper does not become fully closed or close to fully closed, or fully open or close to fully open. In response to large room pressure fluctuations due to room pressure fluctuation factors and large resistance increases in the forced ventilation air path due to filter clogging, etc., the opening of the first damper is fully closed as the opening is adjusted by the room pressure controller. And near the fully closed area (for example, the area shown by the broken line in Fig. 5), the air supply/exhaust volume balance adjustment characteristic of the first damper for the room to be ventilated (the rate of change in ventilation volume with respect to a unit change in damper opening) is In order to prevent large changes, the opening degree of the second damper is adjusted using a basic room pressure controller based on the room pressure detected by the room pressure sensor or based on the opening degree detected of the first damper, so that the In response to pressure fluctuations and large increases in air path resistance, instead of basic adjustment of the air supply/exhaust volume balance by fan capacity control in the room pressure control mode in which fan capacity control is implemented in parallel as described above, supply/displacement can be adjusted by adjusting the opening of the second damper. The solution is to basically adjust the exhaust volume balance, and this will prevent large room pressure fluctuations caused by some room pressure fluctuation factor or large resistance in the forced ventilation air path due to filter clogging, etc. After the increase occurs, even if the room pressure fluctuations are normal and the room pressure fluctuations are small in a state where the room pressure fluctuation factors and the increase in air path resistance are not resolved, the The room pressure can be adjusted and maintained at a set value by adjusting the supply and exhaust amount balance by adjusting the opening degree of the first damper within the range.

〔Effect of the invention〕

(First invention) According to the first invention, the opening adjustment is performed within the adjustable range of the damper, which is limited to a small range in the damper configuration so that the adjustment characteristics of the supply/exhaust flow balance, that is, the room pressure adjustment characteristics, do not change too much. Since the room pressure adjustment function by adjusting the opening degree of the first damper is maintained, in other words, by adjusting the opening degree of the first damper using the room pressure controller and adjusting the supply/exhaust balance, the room pressure in the room to be ventilated can be adjusted. In adjusting and maintaining the pressure at the set value, large room pressure fluctuations,
Even if there is a large increase in resistance in the forced ventilation air path due to filter clogging, etc., the supply/exhaust volume balance adjustment characteristics of the first damper, that is, the room pressure adjustment characteristics, will not change significantly. A type that adjusts the room pressure only by adjusting the opening, that is, a single damper's air supply/exhaust balance adjustment characteristics, room pressure, in response to large room pressure fluctuations and large increases in resistance in the forced ventilation air path due to filter clogging, etc. Compared to the conventional type in which the adjustment characteristics are increased, the stability of room pressure control against normal minute room pressure fluctuations and the adjustment accuracy can be greatly improved.

In this way, although the stability and adjustment accuracy of room pressure control against normal minute room pressure fluctuations have been greatly improved, the response range of room pressure control is limited to the supply/exhaust volume balance by adjusting the opening degree of the second damper. The room pressure can be controlled over a wide range with basic adjustment, and can even withstand large room pressure fluctuations caused by some room pressure fluctuation factors or large increases in resistance in the forced ventilation air path due to filter clogging, etc. can be maintained sufficiently.

In addition, the basic adjustment of the air supply and exhaust volume balance is performed by adjusting the opening of the damper (second damper), which has higher adjustment accuracy and response than fan capacity control, so as mentioned earlier, forced ventilation fan capacity control is effective. Even when compared to a method in which the basic adjustment of the supply/exhaust volume balance is performed, the adjustment accuracy and responsiveness of the basic adjustment of the supply/exhaust volume balance can be improved, and better room pressure controllability can be obtained.

Moreover, in the first invention, the first damper and
Since the second damper, which performs basic adjustment of the supply/exhaust volume balance, is installed in the forced ventilation air path in series, the room pressure of the room to be ventilated and the air flow of the forced ventilation air path are adjusted and maintained at the set value. pressure, in other words, the first
Even if the differential pressure across the serial arrangement of the damper and the second damper changes due to a change in the forced ventilation fan's capacity or a change in outdoor atmospheric pressure, the change in the air supply/exhaust balance due to the pressure difference On the other hand, the fact that the second damper operates to basically adjust the supply/exhaust flow balance acts to suppress the change in differential pressure across the first damper alone (i.e., the series arrangement of the first damper and the second damper The change in the differential pressure between the front and rear of the first damper is absorbed by the change in resistance in the second damper due to the change in the opening of the second damper, and this acts to keep the differential pressure across the first damper constant. This not only maintains the room pressure adjustment function by simply adjusting the opening of the first damper within the small range mentioned above, but also adjusts the pressure between the first damper and the second damper due to changes in forced ventilation fan capacity, outdoor atmospheric pressure fluctuations, etc. Even if the pressure difference between the front and rear of the part arranged in series with the damper changes, the pressure difference between the front and rear of the first damper itself is kept constant, and the room pressure adjustment function by adjusting the opening of the first damper can be stably and accurately adjusted. Can be kept high.

(Second invention) According to the second invention, the room pressure adjustment function is maintained by adjusting the first damper opening in a small range that does not significantly change the air supply/exhaust balance adjustment characteristics, that is, the room pressure adjustment characteristics. In other words, by adjusting the opening degree of the first damper using the room pressure controller and adjusting the supply/exhaust flow balance, the room pressure in the room to be ventilated can be adjusted and maintained at the set value. Even if there is a large increase in resistance in the forced ventilation air path due to fluctuations or filter clogging, the supply/exhaust volume balance adjustment characteristics of the first damper, that is, the room pressure adjustment characteristics, will not change significantly. This method adjusts the room pressure only by adjusting the opening of the damper.In other words, the single damper has the ability to adjust the supply and exhaust volume balance against large room pressure fluctuations or large increases in resistance in the forced ventilation air path due to filter clogging, etc. , compared to the conventional type, which had larger room pressure adjustment characteristics,
Similar to the invention, the stability and adjustment accuracy of room pressure control against normal minute room pressure fluctuations can be greatly improved.

Although the stability and adjustment accuracy of room pressure control with respect to normal minute room pressure fluctuations are greatly improved in this way, the response range of room pressure control is also improved by using the second damper, as in the first invention described above. Basic adjustment of the air supply and exhaust volume balance by adjusting the opening degree of the air supply and exhaust air can be ensured widely, and large room pressure fluctuations caused by some room pressure fluctuation factor or large forced ventilation air channels due to filter clogging, etc. can be ensured widely. The room pressure control function can be sufficiently maintained even when resistance increases.

In addition, since the basic adjustment of the air supply and exhaust volume balance is performed by adjusting the opening of the damper (second damper), which has higher adjustment accuracy and response than the capacity control of the fan, it is possible to Similar to the first invention described above, even when compared to the form of basic adjustment of quantity balance,
It is possible to improve the adjustment accuracy and responsiveness of the basic adjustment of the supply/exhaust volume balance, and to obtain better room pressure controllability.

Moreover, in the second invention, as in the first invention, the first damper and the second damper are installed in the forced ventilation air path in series, so that the ventilation target room to be adjusted and maintained at the set value is The pressure difference between the room pressure and the air path pressure of the forced ventilation air path, in other words, the pressure difference between the front and rear parts of the series arrangement of the first damper and the second damper can change the capacity of the forced ventilation fan or change the outdoor atmospheric pressure. Even if the differential pressure changes due to factors such as Acts to suppress change (i.e.
In a state where the change in the differential pressure between the front and rear of the series arrangement part of the first damper and the second damper is absorbed by the resistance change in the second damper due to the change in the opening degree of the second damper, the difference between the front and rear of the first damper alone is This not only maintains the room pressure adjustment function by simply adjusting the opening of the first damper within the small range mentioned above, but also changes the capacity of the forced ventilation fan and The first damper and the second damper due to atmospheric pressure fluctuations, etc.
Even if the pressure difference between the front and rear of the part arranged in series with the damper changes, the pressure difference between the front and rear of the first damper alone is kept constant.
The room pressure adjustment function by adjusting the opening degree of the first damper can be maintained stably and with high adjustment accuracy.

〔Example〕

Next, an embodiment of the first invention will be described.

As shown in FIG. 1, an air conditioner 2 adjusts the temperature and humidity of outside air taken in from an intake louver 1, and an air supply fan 4 supplies the air conditioned by the air conditioner 2 to a plurality of clean rooms 3. On the other hand, an exhaust fan 6 for discharging the indoor air of each of the clean rooms 3 from the exhaust louver 5 to the outside, and a return air passage 7 for returning a part of the air supplied from the exhaust fan 6 to the air conditioner 2 are provided. A ventilation system for each clean room 3 as a room to be ventilated is configured.

Each branch air supply path 9 that connects the air supply path 8 from the air supply fan 4 to each clean room 3 is equipped with an air volume sensor 10 and a damper 11 for adjusting air volume, and the system controller controls the air volume detected by the air volume sensor 10. An air volume controller 13 is provided which automatically operates the air volume adjustment damper 11 so as to maintain the air volume at the air volume instructed by the air volume controller 12.

Further, a branch exhaust path 1 connects each clean room 3 to an exhaust air path 14 connected to the exhaust fan 6.
Each of the clean rooms 5 is equipped with a damper device 16 for adjusting the room pressure as a room pressure control means for each clean room 3, and the room pressure detected by the room pressure sensor 17 attached to each clean room 3 is instructed by the system controller 12. A room pressure controller 18 adjusts the supply/exhaust volume balance of each clean room 3 by automatically operating the room pressure adjustment damper device 16 and adjusting the ventilation volume of each branch exhaust path 15 so as to maintain the room pressure at the same room pressure.
It is equipped with.

That is, by setting a program for the system controller 12, the amount of air supplied to each clean room 3 and the room pressure of each clean room 3 are automatically controlled according to the usage conditions of each clean room 3.

For the supply air fan 4, there is a supply pressure control that controls the capacity of the supply air fan 4 so that the supply pressure detected by the supply pressure sensor 19 attached to the supply air passage 8 is maintained at the supply pressure instructed by the system controller 12. The exhaust fan 6 is connected to the exhaust fan 6 in such a way that the exhaust pressure detected by the exhaust pressure sensor 21 attached to the exhaust air passage 14 is maintained at the exhaust pressure instructed by the system controller 12. An exhaust pressure controller 22 is attached to control the capacity.

Then, the supply pressure controller 20 and the exhaust pressure controller 2
The control system for instructing the system controller 12 to control the supply pressure and exhaust pressure as control targets for the air volume control damper 11 which is fed back to the system controller 12 as a result of air volume control by each air volume controller 13. The control configuration is such that the supply pressure is instructed to the supply pressure controller 20 such that the maximum of each damper opening falls within the appropriate opening range set close to the full opening, while the exhaust pressure For each room pressure controller 1
As a result of room pressure control by 8, all of the damper opening degrees of the damper devices 16 for adjusting the room pressure, which are fed back to the system controller 12, are set at appropriate intermediate openings except for the vicinity of the fully open position and the position near the fully closed position. Exhaust pressure controller 2 adjusts the exhaust pressure so that it falls within the range of
The control configuration is such that instructions are given to 2.

In other words, regarding the supply pressure, the damper opening degrees a ₁ ,
If the maximum of a ₂ , a ₃ , and a ₄ deviates from the set appropriate opening range ax toward the opening side as shown in Figure 2 A, the supply pressure is gradually increased and feedback is applied. The maximum damper opening degree a ₁ , a ₂ , a ₃ , a ₄ of each of the air volume adjustment dampers 11 is the second one.
As shown in Figure 2C, when the set proper opening degree range ax is deviated to the closing side, the supply pressure is gradually lowered, and as a result, as shown in Figure 2B, each of the dampers 11 for adjusting air volume The air supply pressure control is performed so that the maximum of the openings a ₁ , a ₂ , a ₃ , and a ₄ is maintained within the appropriate opening range ax set close to the full opening.

On the other hand, regarding the exhaust pressure, the damper opening degree of each damper device 16 for adjusting the room pressure is fed back.
If at least one of b ₁ , b ₂ , b ₃ , and b ₄ deviates from the appropriate intermediate opening range bx to the opening side as shown in Figure 3 A, the exhaust pressure is gradually lowered and , at least one of the damper opening degrees b ₁ , b ₂ , b ₃ , b ₄ of each damper device 16 for room pressure adjustment that has been fed back is set to the closed side within the appropriate intermediate opening range bx as shown in FIG. When the _exhaust pressure deviates from the above, the exhaust pressure is _gradually increased, and as a result, as shown in _{FIG .} Exhaust pressure control is performed so that all of the openings are maintained within the set appropriate intermediate opening range bx except for the vicinity of the fully open opening and the vicinity of the fully closed opening.

That is, air volume control by each air volume controller 13,
And, by controlling the room pressure by each room pressure controller 18,
By performing the above-mentioned supply pressure control and exhaust pressure control while appropriately maintaining the supply air volume to each clean room 3 and the room pressure of each clean room 3, the supply air fan 4 and exhaust fan It is designed to reduce the power consumption of 6.

To explain in more detail the room pressure control means for each clean room 3, as the damper device 16 for adjusting the room pressure, as shown in FIG.
A first damper 23 and a second damper 24 are arranged in series in a branch exhaust passage 15, which is a part of the forced ventilation air passage for each clean room 3, for adjusting the air supply/exhaust balance of the clean room 3 by adjusting the ventilation volume. Among the first and second dampers 23 and 24, a damper that cannot close the first damper 23 to fully closed or close to fully closed, that is, the first
The damper is configured such that a bypass air passage Fb is formed between the rotary valve element 23A and the damper casing even when the rotary valve body 23A of the damper 23 is in a posture perpendicular to the air passage F. 24 is configured as a damper that can completely close the air passage F by the cooperation of two rotary valve bodies 24A and 24B.

In other words, as described above, by configuring the first damper 23 in a structure in which it is impossible to close the first damper 23 to a fully closed position or close to a fully closed position (in this example, a structure in which it is impossible to close it in the area shown by the broken line in FIG. 5). , the adjustable opening range cx of the first damper 23 itself is limited to a small range on the damper structure (in this example, limited to the area shown by the solid line in Fig. 5), thereby improving room pressure control. ,
1st position over the entire opening adjustment range cx.
Even if the opening degree c of the damper 23 is changed, the air supply/exhaust volume balance adjustment characteristic of the first damper 23 for the clean room 3 (the rate of change in the ventilation amount Q with respect to a change in the opening degree c of the unit amount) is made so that it does not change much. be.

In addition, by arranging the second damper 24 in series with the first damper 23 and interposing it in the branch exhaust passage 15, the adjustable opening range cx of the first damper 23 can be reduced in terms of the damper structure, as described above. Although the range is limited, when necessary, the ventilation volume of the branch exhaust passage 15 can be greatly changed by adjusting the opening degree of the second damper 24, thereby making it possible to adjust the room pressure by adjusting the supply and exhaust amount balance. With a wide response range, the room pressure adjustment function can be used even against large room pressure fluctuations due to some room pressure fluctuation factor, or large increases in air resistance due to clogging of filters inserted in the air path. It is made so that it can be maintained.

Regarding the opening degree adjustment of each of the first and second dampers 23 and 24, the above-mentioned room pressure controller 18 is controlled to adjust the detected room pressure to the room pressure instructed by the system controller 12 based on the room pressure detected by the room pressure sensor 17. In addition, the opening degree c of the first damper 23 is adjusted so that the opening degree c of the first damper 23 is maintained. In order to deal with large room pressure fluctuations due to generation of air pressure, large increases in air passage resistance due to clogging of intervening filters, etc., the room pressure controller 18 adjusts the opening of the first damper 23.
3 remains at the lower limit or upper limit of the adjustable opening cx, which is limited to a small range as described above, and the room pressure adjustment function of the first damper 23 is impaired. Similarly, the second damper 2 is adjusted based on the chamber pressure detected by the chamber pressure sensor 17 to avoid
A basic room pressure controller 18A for adjusting the opening degree b of No. 4 is provided.

In other words, as shown in FIG. 6, the difference value (ΔP=Px− _P0 ) between the room pressure value (P ₀ ) instructed by the system controller 12 and the room pressure value (Px) detected by the room pressure sensor 17 is , the larger the difference value (ΔP) on the positive side (Px>P ₀ ), the greater the opening degree c of the first damper 23 is changed to the increasing side, and the larger the difference value (ΔP) is on the positive side (Px
By adjusting the opening degree of _the first damper 23 using the room pressure control 18, the opening degree c of the first damper 23 is changed to the decreasing side so that a large difference value (ΔP) occurs in the clean room. The detection chamber pressure (Px) is adjusted and maintained at the indicated chamber pressure (P ₀ ) by the system controller 12 by finely adjusting the supply/exhaust flow balance in step 3. The width d is set, and when the difference value (ΔP) deviates from the upper limit (ΔPmax (positive value)) of the allowable variation width d, the opening degree b of the second damper 24 is increased according to the amount of deviation. Basically, when the difference value (ΔP) deviates from the lower limit of the allowable fluctuation width d (ΔPmin (load)), the opening degree b of the second damper 24 is reduced according to the amount of deviation. The room pressure controller 18A adjusts the opening of the second damper 24 to basically adjust the supply/exhaust balance of the clean room 3 (in other words, the room pressure is adjusted by adjusting the opening of the first damper 23). As a result of the basic adjustment, the difference value (ΔP) is returned to and maintained within the allowable fluctuation range d, as shown in parts A and B in Figure 6. As a result, large room pressure fluctuations due to the occurrence of some room pressure fluctuation factor,
Even in the event of a large increase in air path resistance due to clogging of the intervening filter, etc., the opening degree c of the first damper 23 is limited to a small range as described above in adjusting the opening degree of the first damper 23 by the room pressure controller 18. Adjustable opening range
By preventing cx from remaining at the lower limit opening or upper limit opening, the room pressure adjustment function for normally minute room pressure fluctuations, which is performed by adjusting the opening of the first damper 23, is maintained. .

To summarize the room pressure control above, the opening of the second damper 24 should be By making basic adjustments to the air supply/exhaust volume balance through adjustment, a wide range of room pressure control can be secured, and measures can be taken to ensure that the air supply/exhaust volume balance adjustment characteristics, that is, the room pressure adjustment characteristics, do not change too much. 1 The adjustable opening range cx of the damper 23 is limited to a small range due to the damper configuration.
The opening degree of the second damper 24 can be adjusted by adjusting the opening degree of the first damper 23 in the cx to normally respond to small room pressure fluctuations, but also in response to large room pressure fluctuations and large increases in air resistance as described above. By maintaining the basic adjustment of the supply/exhaust volume balance through adjustment, the stability of room pressure control against normal minute room pressure fluctuations can be improved, and
Efforts have been made to improve accuracy.

Furthermore, when providing the first damper 23 and the second damper 24 as described above, by interposing them in the branch exhaust passage 15 in a series arrangement, the support value (P ₀ ) can be adjusted and maintained by the system controller 12. Clean room 3 room pressure and exhaust air passage 1
4, in other words, the pressure difference between the air passage pressure of the first damper 2
Even if the differential pressure across the serially arranged portion of the damper 3 and the second damper 24 changes due to changes in the capacity of the exhaust fan 6, changes in outdoor atmospheric pressure, etc., the change in air supply and exhaust volume will not change due to the change in pressure difference. In contrast, the second damper 24 operates to basically adjust the supply/exhaust balance, which acts to suppress the change in differential pressure across the single first damper 23 (i.e., between the first damper 23 and the second damper 23).
The difference in the pressure difference between the front and rear of the first damper 23 alone is absorbed by the resistance change in the second damper 24 caused by changing the opening degree of the second damper 24. This not only maintains the room pressure adjustment function by simply adjusting the opening of the first damper within the small range mentioned above, but also changes the capacity of the exhaust fan 6 and adjusts the outdoor pressure. Even when the pressure difference across the serially arranged portion of the first damper 23 and the second damper 24 changes due to atmospheric pressure fluctuations, the pressure difference between the front and rear of the single first damper 23 is kept constant. The chamber pressure adjustment function by adjusting the opening degree is maintained more stably and with high adjustment accuracy.

In the figure, 23M and 24M are operating motors for the first damper 23 and the second damper 24;
In adjusting the opening degrees of the third and second dampers 24,
These operation motors 23M and 24M are automatically operated by the room pressure controller and the basic room pressure controller 18A.

Note that the damper opening degree of the room pressure adjusting damper device 16 which is fed back to the system controller 12 for the exhaust pressure control by the exhaust pressure controller 22 described above is the opening degree b of the second damper 24. be.

Further, the opening degree b of the second damper 24, which feeds back the exhaust pressure control by the exhaust pressure controller 22 to the system controller 12, is set within the above-mentioned appropriate intermediate opening degree range, excluding the vicinity of the fully open degree and the vicinity of the fully closed degree.
By controlling the capacity of the exhaust fan 6 based on the detection of the exhaust pressure so that the opening degree b of the second damper 24 is maintained within bx, Intermediate opening range where displacement balance adjustment characteristics do not change significantly
In the sense of maintaining the balance within bx, it is used for basic adjustment of the supply and exhaust volume balance, which is even more basic than the basic adjustment of the supply and exhaust volume balance by adjusting the opening degree of the second damper 24. The aim is to further stabilize and improve the accuracy of room pressure control while also reducing power consumption.

[Another example]

In the above-mentioned embodiment, the first damper 23 whose opening degree is adjusted by the room pressure controller 18 so as to maintain the detection room pressure at the set value is configured to have a structure that prevents it from being fully closed or close to near the fully closed position. , first damper 23
The adjustable opening range cx itself is limited to a small range in which the air supply/exhaust balance adjustment characteristics of the first damper 23 do not change significantly, and the first damper 23 within the limited adjustable opening range cx Although the basic room pressure controller 18A is configured to adjust the opening of the second damper 24 so as to maintain the room pressure adjustment function by adjusting the opening of A normal fully closable damper is adopted as the first damper 23 whose opening degree is adjusted by the room pressure controller 18 so as to maintain the detection room pressure at the set value, and the damper is arranged in series with the first damper 23. Second
To adjust the opening degree of the damper 24, the opening degree b of the second damper 24 is adjusted by the basic room pressure controller 18A so that the first damper 23 does not become fully closed or close to fully closed, or fully open or close to fully open. By adjusting
The air supply/displacement amount balance adjustment characteristic of the first damper 23 may not be changed too much.

In addition, FIG. 7 shows an example in which the opening degree b of the second damper 24 is adjusted so that the first damper 23 does not reach fully closed or near fully closed. The first damper 2
The opening degree of the second damper 24 is adjusted so that the opening degree of the second damper 24 is adjusted so that the opening degree of the second damper 24 is adjusted, and as a result, the bypass air path Fb is secured.

In the first invention, when the first damper 23 is configured to have a structure in which it is impossible to close the first damper 23 to a fully closed state or close to a fully closed state,
As in the above embodiment, the rotary valve body 2 of the first damper 23
If a configuration is adopted in which a bypass air path Fb is formed even when 3A is in a posture perpendicular to the damper air path F, the damper air path can be maintained even though the adjustable opening range cx is limited to a small range. 1st with respect to the direction of F
The angle θ formed by the rotary valve body 23A of the damper 23 is 0°~
Since a large operating range of 90 degrees is available, the opening degree adjustment (rotation angle adjustment) of the first damper 23 itself can be performed with high accuracy, which has the advantage of increasing the accuracy of room pressure adjustment.

In addition, in forming such a bypass air path Fb, as shown in FIG.
It is also conceivable to form a ventilation hole 25 in the rotary valve body 23A of No. 3, or to provide an external bypass duct 26 for the first damper 23, as shown in FIG.

In carrying out the second invention, the opening degree b of the second damper 24 is adjusted so that the first damper 23 does not reach only fully closed or close to fully closed, as in the example shown in FIG. 7 above. In addition, as shown in FIG.
Furthermore, as shown in FIG. 11, the opening degree of the second damper 24 is adjusted so that the first damper 23 does not reach the fully closed or near fully closed state, or the fully open or near fully open state. Any form of adjusting b may be adopted.

Note that cx in each of FIGS. 7, 10, and 11 showing the embodiment of the second invention is the same as that in the first invention.
In the present invention, the opening adjustment range of the first damper 23 is limited by adjusting the opening of the second damper 24, unlike the adjustable opening range of the first damper 23 which is limited to a small range due to the damper configuration.

In each of the first invention and the second invention, the first invention
The damper 23 and the second damper 24 may be of various types, such as a slide type or a multi-blade shutter type, instead of a rotary valve type.

In addition, the order of installation of the first damper 23 and the second damper 24 arranged in series with respect to the air path direction, and
The intervening interval can be changed as appropriate.

In each of the first invention and the second invention, the second invention
In order to adjust the opening degree of the damper 24, the opening degree of the second damper 24 may be adjusted based on room pressure detection as in the above-mentioned embodiment. However, the main point is the first damper 23
Since the opening degree c of the first damper 23 is a problem, a configuration may be adopted in which the opening degree of the second damper 24 is adjusted based on the opening degree detection of the first damper 23.

In addition, when adopting a configuration in which the opening degree of the second damper 24 is adjusted based on room pressure detection, the room pressure detection for adjusting the opening degree of the second damper 24 and the opening degree adjustment of the first damper 23 are performed. Room pressure detection may be performed using a separate room pressure sensor.

In each of the first and second inventions, the specific control structure of the room pressure controller 18 and the basic room pressure controller 18A may be various, such as a structure using a microcomputer or a structure consisting of a simple electric circuit. Configuration changes are possible.

In each of the first invention and the second invention, the first invention
Instead of installing the damper 23 and the second damper 24 in the forced ventilation air path on the exhaust side to the ventilation target room 3, they may be installed in the forced ventilation air path on the air supply side to the ventilation target room 3.

In each of the first and second inventions, instead of controlling the detected chamber pressure to maintain the detected chamber pressure at the chamber pressure instructed by the system controller 12, as adopted in the previous embodiment, the detection chamber pressure is manually set. The room pressure may be controlled to maintain the detected room pressure at the detected room pressure, and the fan capacity may be controlled to maintain the opening b of the second damper 24 within the appropriate intermediate opening range bx. May be omitted.

The first and second inventions can be applied to rooms to be ventilated for various purposes that require room pressure control, such as clean rooms and laboratory rooms.

Although the first and second inventions are aimed at controlling room pressure, the techniques of the first and second inventions can be applied to, for example, air supply duct systems and exhaust air systems for various purposes. A first damper and a second damper are interposed in series in the air passage system, and the first damper is configured to maintain the detected airflow volume at a set air volume based on the ventilation volume detected by the ventilation volume sensor installed in the air passage system. An air volume controller that adjusts the opening is provided, and as an application of the first invention, the first damper is configured to have a structure in which it is impossible to close the first damper completely or close to the fully closed position, and then the opening of the first damper is adjusted. In order to maintain the air volume adjustment function by adjusting the airflow rate, a basic air volume controller is provided that adjusts the opening degree of the second damper based on the ventilation rate detection or based on the opening degree detection of the first damper. As an application of the second invention, based on the ventilation amount detection or based on the opening degree detection of the first damper so that the first damper does not reach the fully closed or near fully closed state or the fully open state or near fully open state. It is also conceivable to provide a basic air volume controller that adjusts the opening degree of the second damper in order to stabilize and improve the accuracy of air volume control.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the first invention, FIG. 1 is a system diagram showing the overall configuration, FIG. 2 A, B, and C are diagrams explaining air supply pressure control, and FIG. 3 A, B, C are diagrams explaining exhaust pressure control, FIGS. 4 A and B are enlarged views of the damper device that requires room pressure adjustment, FIG. 8 and 9 each show another embodiment of the first invention, FIG. 8 is a perspective view of a rotary valve body, and FIG. 9 is a diagram showing a damper for adjusting room pressure. FIG. 3 is an enlarged view of the device. FIG. 7, FIG. 10, and FIG. 11 each show an embodiment of the second invention.
The figure is an enlarged view of the damper device for adjusting room pressure, and FIGS. 10 and 11 are graphs showing the adjustment characteristics of the first damper. 3... Room to be ventilated, 15... Forced ventilation air path, 1
7... Room pressure sensor, 18... Room pressure controller, 18A
... Basic room pressure controller, 23 ... First damper, 24
...Second damper, c...First damper opening, b...
Second damper opening degree.

Claims (1)

[Claims] 1. In the forced ventilation air passage 15 connected to the room 3 to be ventilated,
A first damper 23 is interposed to adjust the air supply/exhaust balance of the ventilation target room 3 by adjusting the ventilation volume, thereby adjusting the room pressure of the ventilation target room 3, and a room pressure sensor 17 is installed.
The air conditioner is equipped with a room pressure controller 18 that adjusts the opening degree c of the first damper 23 to maintain the detected room pressure at a set value based on the room pressure detected in the ventilation target room 3 by A second damper 24 is installed in the forced ventilation air path 15 in series with the first damper 23 for adjusting the air supply and exhaust balance of the room 3 to be ventilated by adjusting the ventilation volume. is configured such that it cannot be closed completely or close to fully closed, and in order to maintain the room pressure adjustment function by adjusting the opening degree of the first damper 23, it is possible to adjust the pressure based on the room pressure detected by the room pressure sensor 17. Or, an air conditioner including a basic room pressure controller 18A that adjusts the opening degree b of the second damper 24 based on the detection of the opening degree of the first damper 23. 2 In the forced ventilation air path 15 connected to the ventilation target room 3,
A first damper 23 is interposed to adjust the air supply/exhaust balance of the ventilation target room 3 by adjusting the ventilation volume, thereby adjusting the room pressure of the ventilation target room 3, and a room pressure sensor 17 is installed.
The air conditioner is equipped with a room pressure controller 18 that adjusts the opening degree c of the first damper 23 to maintain the detected room pressure at a set value based on the room pressure detected in the ventilation target room 3 by A second damper 24 is installed in the forced ventilation air path 15 in series with the first damper 23 for adjusting the air supply and exhaust balance of the room 3 to be ventilated by adjusting the ventilation volume. Based on the room pressure detected by the room pressure sensor 17 or based on the opening degree detection of the first damper 23, the 2. This air conditioner is equipped with a basic room pressure controller 18A that adjusts the opening degree b of the damper 24.