JPS62223545A - Air conditioning system - Google Patents

Abstract

PURPOSE:To sufficiently secure the corresponding pressure with respect to the room pressure variation and to stabilize the room pressure control by control ling the opening degree of a second damper thereby to maintain the opening degree of a first damper within a limited opening degree range. CONSTITUTION:The control of the opening degree of a first damper 23 by a room pressure controller 18 is kept in the range of a limited opening degree range cx. By setting the allowable variation width (d) of a difference value DELTAP, the balance of a feed and exhaust quantity with respect to a clean room is basically adjusted by controlling the opening degree of the second damper 24 by basic room pressure controller 18A, so that the opening degree (b) of a second damper 24 is increased when the difference value DELTAP is deviated from an upper limit DELTAPmax of the allowable variation width (d), and so that the opening degree (b) is decreased when the difference value DELTAP is deviated from a lower limit DELTAPmin. As a result, the opening degree of the first damper 23 can be kept in the limited opening degree range cx, and the room pressure of a clean room 3 can be kept stably under a room pressure indicated by a system controller 12.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an air conditioner installed in a room to be ventilated for various purposes such as a clean room that requires room pressure control. A first damper is installed in the forced ventilation air path to finely adjust the supply/exhaust balance for the room to be ventilated, and the detected room pressure is adjusted based on the room pressure detected by the room pressure sensor attached to the room to be ventilated. The present invention relates to an air conditioner including a room pressure controller that controls the opening of the first damper so as to maintain the damper at a set value.

[Conventional technology]

Conventionally, in the above air conditioner, the room pressure of the room to be ventilated is controlled by simply controlling the opening of one damper (first damper) installed in the forced ventilation air path according to the detected room pressure. (I am unable to provide references).

[Problem that the invention seeks to solve]

However, when controlling the room pressure by controlling the opening of a single damper, large room pressure fluctuations occur in the room being ventilated, and the resistance of the filter installed in the forced ventilation air path increases due to long-term use. If the amount of air increases due to clogging, the opening of the damper will be changed significantly by controlling the opening based on room pressure detection. has characteristics that change non-proportionally as shown by the broken and solid lines. Therefore, when the opening degree of the damper is changed significantly, the adjustment characteristics of the damper's supply/exhaust volume balance for the room to be ventilated (unit quantity Even the rate of change in ventilation volume (B) with respect to damper opening (C) changes increases (changes).

However, the fact that the adjustment characteristics of the supply/exhaust volume balance in the damper changes greatly depending on the damper opening state is a factor that makes normal room pressure control unstable (hunting and decreased responsiveness) in response to minute fluctuations in room pressure. As a result, it becomes difficult to stably maintain the room pressure in the room to be ventilated at the desired set value. There is still a problem in which sufficient reliability cannot be obtained in preventing this by controlling the room pressure.

The purpose of the present invention is to rationally adjust the ventilation volume in the forced ventilation air path, that is, to rationally adjust the supply and exhaust volume balance for the room to be ventilated, while ensuring a sufficiently large amount of room pressure fluctuations. The aim is to stabilize control.

[Means for solving problems]

The characteristic configuration of the air conditioner according to the present invention is that a second damper that adjusts the ventilation volume is installed in a forced ventilation air passage that includes a first damper whose opening degree is controlled by a room pressure controller based on detected room pressure. the opening control of the room pressure controller for the first damper is set within a limited opening range based on the room pressure detected by the room pressure sensor or based on the opening detection of the first damper; The basic room pressure controller is provided to control the opening of the second damper so as to maintain the same.The functions and effects thereof are as follows.

[For production]

In other words, the control state of the room pressure controller for the first damper is determined based on the detected room pressure of the room pressure sensor, which is the reference for controlling the opening of the first damper, or based on the detection of the opening of the first damper itself. , the second by the basic room pressure controller
By controlling the opening of the damper, the supply/exhaust volume balance for the room to be ventilated is basically adjusted. The opening control is maintained within the set limit opening range, and the set limit opening range is as follows:
In the first damper, the adjustment characteristic of the supply/exhaust volume balance for the room to be ventilated is too wide (opening range where it does not change, that is, the opening range where the rate of change in ventilation volume for a unit change in damper opening does not change too much). Set it in advance.

As a result, although it is possible to secure a sufficiently large response range for room pressure control by basic adjustment of the supply/exhaust volume balance by controlling the opening degree of the second damper, the stability of room pressure control under normal conditions against minute fluctuations in room pressure is By controlling the opening of the first damper, which is always maintained within the set limit opening range, the system is greatly improved compared to the conventional type in which the room pressure is controlled only by controlling the opening of one damper.

〔Effect of the invention〕

Therefore, the response range of room pressure control is sufficiently wide, so that it can sufficiently respond to large fluctuations in room pressure caused by any reason or increased resistance due to clogging of the filter installed in the forced ventilation air path. However, it is now possible to stably maintain the room pressure in the room to be ventilated at the desired set value under normal conditions, further reliably preventing the unexpected entry of contaminated air into the clean room and the accidental leakage of harmful gas from the experimental room. We have created an air conditioner that is highly reliable in terms of room pressure control.

By the way, in order to stabilize room pressure control in normal conditions while ensuring a wide range of room pressure control, instead of providing the second damper as described above, the opening can be controlled by a room pressure controller based on room pressure detection. Forced ventilation is performed based on the detection chamber pressure and the detection of the opening of the first damper so that the opening of the first damper is maintained within a limited opening range in which the adjustment characteristics of the supply/exhaust volume balance do not change too much. It is possible to make basic adjustments to the air supply/exhaust balance for the room to be ventilated by controlling the capacity of the fan, but since it is necessary to equip a fan whose capacity can be controlled, the cost of the room pressure control system increases, and Even if it is a basic adjustment of the supply/exhaust volume balance, there is a problem in that sufficient adjustment accuracy and responsiveness cannot be obtained by controlling the fan capacity.

In this respect, according to the present invention, the basic adjustment of the supply and exhaust amount balance for the room to be ventilated is performed by controlling the opening degree of the damper (second damper), so the system cost is lower than that of the type that controls the capacity of the fan. Moreover, compared to the type that inherently controls fan capacity, it is possible to ensure high adjustment accuracy and high responsiveness for the basic adjustment of air supply and exhaust volume balance, so it is possible to reduce room pressure caused by any reason. Not only can the response to large fluctuations be improved, but also the opening control range of the first damper can be accurately maintained, and room pressure control can be stabilized even more effectively.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figure 1, an air conditioner (2) that adjusts the temperature and humidity of the outside air taken in from the intake louver (1),
The air conditioned by 2) is sent to multiple clean rooms (3
), and an exhaust fan (6) that exhausts indoor air from each of the clean rooms (3) to the outside from the exhaust louver (5), and from the exhaust fan (6). A return air passage (7) is provided to return part of the supplied air to the air conditioner (2), thereby configuring a ventilation system for a plurality of clean rooms (3) as rooms to be ventilated.

Each branch air supply path (9) that connects the air supply path (8) from the air supply fan (4) to each clean room (3) has an air volume sensor (10) and a wind! Km maintenance damper (11)
It is also equipped with an air volume controller (13) that automatically operates the wind IT adjustment damper (11) so as to maintain the air volume detected by the air volume sensor (10) at the air volume instructed by the system controller (12). It is.

In addition, a branch exhaust path (1) connects each clean room (3) to an exhaust air path (14) connected to an exhaust fan (6).
The husband k of 5) is equipped with a damper device (16) for regulating the room pressure as a room pressure control means for each clean room (3), and a room pressure sensor (17) attached to each clean room (3). A room pressure system that adjusts the supply and exhaust balance of each clean room (3) by automatically operating the room pressure adjustment damper device (16) so as to maintain the detected room pressure at the room pressure instructed by the system controller (12). Controller (
18).

In other words, the air supply volume 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) by setting a program for the system controller (12). It is composed.

For the supply air fan (4), the supply air fan is operated so as to maintain the supply pressure detected by the supply pressure sensor (19) attached to the supply air path (8) at the supply pressure instructed by the system controller (12). (4) is equipped with a supply pressure controller (20) that controls the capacity, and an exhaust pressure sensor (21) attached to the exhaust air path (14) is attached to the exhaust fan (6).
The exhaust fan (6) maintains the detected exhaust pressure 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 (22
), the system controller (12) instructs the system controller (12) to control the supply pressure and exhaust pressure as control targets. Instructs the supply pressure controller (20) to set the supply pressure such that the maximum opening of each damper (11) for adjusting the air volume is set close to the full opening and falls within the appropriate opening range. On the other hand, the exhaust pressure is controlled by each damper device (16) for adjusting the room pressure, which is fed back to the system controller (12) as a result of room pressure control by each room pressure controller (18). A control configuration that instructs the exhaust pressure controller (22) to set an exhaust pressure such that all of the opening degrees of the damper fall within the appropriate intermediate opening range, which is set except for the vicinity of the fully open/closed position and the vicinity of the fully closed position. It has become.

In other words, regarding the supply pressure, the damper opening degree (al) of each of the air volume adjustment dampers (11) that has been fed back,
The maximum of (a2), (a-), and (a4) is the appropriate opening range (ax) as shown in Figure 2 (a).
When it deviates to the open side, the supply pressure is gradually increased, and the feedback air volume adjustment damper (
11) Each damper opening (aI).

The maximum of (a-), (a=), and (a4.) is the appropriate opening range (a) as shown in Figure 2 (c).
x) deviates to the closed side, the supply pressure is gradually lowered, and as a result, as shown in FIG. 2 (0), the damper opening degree (aI) of each of the air volume adjustment dampers (11) .

The maximum of (a2), (a3), and (a4.) is close to full opening (appropriate opening range (ax)
Boost pressure control is performed to maintain the pressure within the range.

On the other hand, regarding the exhaust pressure, the damper opening degree (bl) of each damper device (16) for adjusting the room pressure is fed back.
, (b2), (bat), and (b4) deviate from the appropriate intermediate opening range (bx) to the opening side, as shown in Figure 3 (a), gradually reduce the exhaust pressure. The damper opening degree (bl
), (bz), (bz), and (b4.) is outside the appropriate intermediate opening range (bx) toward the closing side, as shown in Figure 3 (c), the exhaust pressure should be reduced. As a result, as shown in FIG. 3 (Il+
), the damper opening degrees (bt), (bz), (bt) of the damper device (16) for adjusting room pressure.
, (bn) are all maintained within the set appropriate intermediate opening range (bx) except for the vicinity of the fully open position and the vicinity of the fully closed position.

In other words, by controlling the supply pressure and exhaust pressure as described above, the air supply fan ( 4) and the exhaust fan (6).

To explain in more detail the room pressure control means for each clean room (3), the above-mentioned room pressure adjustment damper device (16
), as shown in Figure 4 (A) and (II), the first
A damper (23) and a second damper (24) are arranged in series in a branch exhaust passage (15) that is a part of the forced ventilation air passage for each clean room (3), and the first and second dampers (24) are interposed in series. 23).

Among (24), the first damper (23) is set to a damper that cannot completely close the air passage, that is, the rotary valve body (23A) of the first damper (23) is in a position orthogonal to the air passage (F). Even if the rotary valve body (23A) and damper casing (16
A), and the second damper (24) is configured to have a bypass air passage (Fb) between the damper and the damper.
The damper is configured so that the air passage (F) can be completely closed by the cooperation of two rotary valve bodies (24A) and (24B).

In other words, by configuring the first damper (23) so that it cannot be fully closed, the first damper (23)
23), the opening adjustment range is defined as the range (cx) in which the rate of change in ventilation volume (Q) with respect to a unit change in opening (C) does not change significantly, that is, the air supply/exhaust volume for the clean room (3). The balance is limited to a range (ax) in which the adjustment characteristics of income and expenditure do not change too much, and thereby,
The first damper (23) is used as a damper for finely adjusting the supply/exhaust volume balance in order to stably adjust the room pressure against minute fluctuations in the room pressure.

Also, a second damper that can be fully closed with respect to the first damper (23) is provided.
By connecting the dampers (24) in series, the second
By adjusting the opening degree of the damper (24), the overall ventilation amount in the branch exhaust passage (15) can be changed significantly, that is,
The period during which the supply/exhaust volume balance for the clean room (3) is being adjusted is increased to ensure that the period during which the room pressure is being adjusted is widened.

The control system for the first and second dampers (23) and (24) maintains the chamber pressure detected by the chamber pressure sensor (17) at the chamber pressure instructed by the system controller (engineering 2). The above-mentioned room pressure controller (18) is provided as a controller for controlling the opening of the first damper (23) based on the detected room pressure. The proper opening adjustment range of the first damper (23) that cannot be fully closed is
The angle θ formed by the rotary valve body (23A) with respect to the air path (F) direction is in the range of O'' to 90°), that is, the above-mentioned setting is made so that the adjustment characteristics of the air supply and exhaust flow balance do not change too much. A basic room pressure controller (18A) that controls the opening of the second damper (24) based on the room pressure detected by the room pressure sensor (17) so as to maintain it within the limited opening range (cx).
is attached to the room pressure controller (18).

In other words, as shown in Figure 6, the system controller (
12) The difference value (ΔP =
As Px - Po) increases toward the positive side (Px > Po), the opening degree (c) of the first damper (23) is increased;
And the difference value (ΔP) is thick (Px < Po) on the negative side (
Indeed, the room pressure controller (18) controls the first damper (23) so as to reduce the opening degree (c) of the first damper (23).
3) By controlling the opening, clean room (3)
The detected chamber pressure is maintained at the chamber pressure indicated by the system controller (12) by finely adjusting the air supply/exhaust balance for the first damper (23) by the room pressure controller (18).
) is maintained within the above-mentioned limited opening range (cx), the difference value (ΔP) is within the permissible fluctuation (d), and the difference value (ΔP) is within the permissible fluctuation (d). When the upper limit (ΔPmax) of ΔPmax is deviated from, the second damper (
24) so as to increase the opening degree (b) and the difference value (
When ΔP) deviates from the lower ff1 (ΔPm1n) in (a) during the allowable fluctuation, the second damper (
The basic room pressure controller (18A) controls the opening of the second damper (24) so as to reduce the opening (b) of the clean room (3) to basically adjust the supply/exhaust balance for the clean room (3). As a result of the basic adjustment, the difference value (Δ
In other words, the first damper (23) by the room pressure controller (18)
) is maintained within the above-mentioned limited opening range (cx).

To summarize the room pressure control above, the second damper (2
4) Basic adjustment of the air supply/exhaust volume balance through opening control ensures a sufficiently large period of room pressure control, and prevents large fluctuations in room pressure caused by any reason, or interference with ventilation air channels. The opening range (cx) is set appropriately so that the adjustment characteristics of the supply/exhaust volume balance do not change too much, while also being able to sufficiently respond to increases in resistance due to filter clogging. The first damper (2
The opening degree control in 3) stabilizes the normal room pressure control against small fluctuations in room pressure, so that the room pressure in the clean room (3) can be stably maintained at the room pressure instructed by the system controller (12). It's Nishide.

In the figure (23M) and (24M) are the first damper (2
3) and the second damper (24), and in controlling the opening degrees of the first damper (23) and the second damper (24), these operating motors (23M), (
24M) is the room pressure controller (18) and the basic room pressure controller (1
8A) is automatically operated.

Note that the damper opening degree of the room pressure adjustment damper device (16) that feeds back to the system controller (12) for exhaust pressure control by the exhaust pressure controller (22) described above is based on the opening of the second damper (24). The degree (b) is fed back to the system controller (12).

Furthermore, 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 except for around the fully open position and around the fully closed position. By controlling the capacity of the exhaust fan (6) based on exhaust pressure detection so as to maintain the exhaust fan (6) within the appropriate intermediate opening range (bx),
A state in which the capacity control in 6) is used for basic adjustment of the supply and exhaust amount balance for the lean room (3), which is more basic than the opening control of the second damper (24) by the basic room pressure controller (18^). Then, the opening degree of the second damper (24) by the basic room pressure controller (18A) is also controlled at an intermediate opening degree in which the supply/exhaust volume balance adjustment characteristics of the second damper (24) do not change significantly. This also serves to reduce the power consumption of the exhaust fan (6) and further stabilize the room pressure control.

[Another example]

Another embodiment of the present invention will be described below.

In the above-mentioned embodiment, by configuring the first damper (23) so that it cannot be fully closed, the opening adjustment range of the first damper (23) is set to a set limit opening that does not change the adjustment characteristics of the supply and exhaust amount balance too much. The opening of the first damper (23) by the room pressure controller (1st) is mechanically limited to the appropriate opening adjustment range of the first damper (23). The aforementioned setting limit opening range (cx)
However, as shown in Fig. 7, the first damper (23) is a normal damper that can be fully closed, and the The opening control of the first damper (24) by the room pressure controller (1st) is maintained within the set limit opening range (cx) by basically adjusting the supply/exhaust flow balance by controlling the opening of the second damper (24). The first damper (2
3) is set to a setting limit opening range (cx) in which the adjustment characteristics of the air supply/exhaust volume balance are not too large (in the example shown in Fig. 7, the rotary valve body (23A) is The angle θ may be limited to a range of approximately 00° to 40°.

In addition, the first damper (23) is configured so that it cannot be fully closed, and the opening adjustment range of the first damper (23) is set within the limited opening range (C).
In the case of a type in which χ) is mechanically limited in advance, the mechanical limitation configuration is the first damper (
If a configuration is adopted in which a bypass air passage (Fb) is formed even when the rotary valve body (23A) of 23) is in a posture perpendicular to the air passage (F), the adjustment characteristics of the supply and exhaust amount balance can be improved. The operating range of the rotary valve body (23A) corresponding to the set limit opening range (cx) that does not change the air flow path (F
) The angle θ formed by the rotary valve body (23A) with respect to the direction is O''
Since a large operating range from 906 to 906 can be adopted, there is an advantage that the accuracy of fine adjustment of the chamber pressure by controlling the opening degree (rotation angle control) of the first damper (23) can be increased.

In addition, in forming such a bypass air passage (Fb), as shown in FIG. 8, it is necessary to form a ventilation hole (25) in the valve body (23A) of the first damper (23). As shown in FIG. 9, it is also conceivable to provide an external bypass duct (26) for the first damper (23).

In the first damper (23), the adjustment characteristics of the supply and exhaust volume balance (i.e., the ventilation ffi (Q
) is the limit opening range (
It is only necessary to decide in which part and with what width the ax) should be set, depending on the situation.In some cases, as shown in Fig. 10, it may be set in the fully open side part, or
As shown in FIG. 11, an intermediate opening portion excluding both the fully closed side portion and the fully open side portion may be set.

As the first damper (23) and the second damper (24), various types of dampers can be used, such as a slide type or a multi-blade shutter type, instead of the rotary valve type.

Also, those first and second dampers (23), (24
) can be changed as appropriate for the direction of the air passage and the interposition interval.

The basic room pressure controller (18A) controls the first damper (23) so that the opening control of the first damper (23) by the room pressure controller (18) based on room pressure detection is maintained within the set limit opening range (cx). To control the opening of the second damper (24), instead of controlling the opening of the second damper (24) based on room pressure detection, the opening of the second damper (24) is controlled based on the detection of the opening of the first damper (23). 24) It may be configured to control the opening, in short, the first control by the room pressure controller (18) based on room pressure detection.
Any configuration may be used as long as the opening degree control state of the damper (23) is determined and the opening degree of the second damper (24) is controlled.

In addition, when controlling the opening of the second damper (24) based on room pressure detection, the room pressure is detected to control the opening of the second damper (24) and the opening of the first damper (23) is controlled. A separate room pressure sensor may be used to detect the room pressure.

The specific control structure of the room pressure controller (18) and the basic room pressure controller (18A) can be modified in various ways, such as a structure using a microcomputer or a structure consisting of a simple electric circuit.

Instead of installing the first damper (23) and the second damper (24) in the forced ventilation air path on the exhaust side of the room to be ventilated (3), forced ventilation air on the air supply side to the room to be ventilated (3) can be used. It may be installed on the road.

As a room pressure control system, instead of controlling the detected room pressure to maintain the detected room pressure at the room pressure instructed by the system controller (12) as employed in the above embodiment, the system controls the room pressure to the room pressure set manually. Room pressure control may be performed to maintain the detection chamber pressure, and the opening degree (b) of the second damper (24) may be
) may be omitted.

INDUSTRIAL APPLICATION This invention can be utilized for the ventilated room of various uses which require room pressure control, such as a clean room and a laboratory room.

Although the purpose of the present invention is to control room pressure, the technology of the present invention can be applied, for example, by installing the first damper and the second damper in an air supply air passage system or an exhaust air passage system for various purposes. An airflow controller is installed to control the opening of the first damper to maintain the detected airflow at the set airflow based on the airflow detected by the airflow sensor installed in the air passage system. The opening degree of the first damper is controlled by the controller.
Basic air volume control that controls the opening of the second damper based on the ventilation volume detection or the opening detection of the first damper so that the ventilation volume adjustment characteristics of the first damper are maintained within the set limit opening range where the ventilation volume adjustment characteristics do not change too much. It is also conceivable to provide a device to stabilize air volume control.

[Brief explanation of drawings]

Figures 1 to 6 show embodiments of the present invention, Figure 1 is a system diagram showing the overall configuration, and Figure 2 is a system diagram showing the overall configuration.
(C) is a diagram explaining the air supply pressure control, Figure 3 <4>,
(0) 1 (c) is a diagram explaining exhaust pressure control, Figure 4 (
() and (El) are enlarged views of the damper device for adjusting room pressure, Figure 5 is a graph showing the adjustment characteristics of the first damper, and Figure 6 is a graph showing the adjustment characteristics of the first damper.
The figure is a diagram showing a room pressure control mode. Figures 7 to 11
The figures show different embodiments of the present invention, FIGS. 7 to 9 are enlarged views of the damper device for adjusting room pressure, and FIGS. 10 and 11 are graphs showing the adjustment characteristics of the first damper, respectively. It is. (3)...Room to be ventilated, (15)...
Forced ventilation air path, (17)...Room pressure sensor, (
18)...Room pressure controller, (18A)...
・Basic room pressure controller, (23)...First damper, (24)...Second damper, (cx)...
...Setting limit opening range.

Claims (1)

[Claims] In the forced ventilation air path (15) connected to the room to be ventilated (3),
A first damper (23) for finely adjusting the supply/exhaust balance for the ventilation target room (3) is interposed, and the room pressure is detected by a room pressure sensor (17) attached to the ventilation target room (3). Based on this, the room pressure controller (18) controls the opening of the first damper (23) to maintain the detected room pressure at the set value.
), the forced ventilation air path (15
) is equipped with a second damper (24) that adjusts the ventilation amount,
Based on the room pressure detected by the room pressure sensor (17),
Alternatively, the room pressure controller (
18) An air conditioner provided with a basic room pressure controller (18A) that controls the opening of the second damper (24) so as to maintain the opening control of the second damper (24) within a set limit opening range (cx).