JPH03207944A - Air-conditioner - Google Patents

Abstract

PURPOSE:To stabilize a room pressure control for a very small change while securing a wide range of correspondence, by providing a room pressure controller which adjusts the opening of a first damper so that a room temperature be kept at a set value on the basis of detection of the room temperature of a room, an object of ventilation, by a room pressure sensor. CONSTITUTION:The opening of a first damper 23 is adjusted by a room pressure controller 18 so that the opening (c) of the first damper 23 be changed to a large extent onto the increase side in such a degree that a large difference value P is produced on the positive side Px>Po on the assumption that the difference value P between the room pressure value Po specified by a system controller 12 and the detected room pressure value Px by a room pressure sensor 17 equals Px minus Po, and so that the opening (c) of the first damper 23 be changed to a large extent onto the decrease side in such a degree that the large difference value P is produced on the negative side Px<Po. By adjusting finely the income and outgo of the quantity of charge and discharge of air of a clean room 3 in this way, the detected room pressure Px is adjusted to and kept at the room temperature Po specified by the controller 12. Besides, a room pressure adjusting function for an ordinary minute change in the room pressure performed by adjusting the opening of the first damper 23 is maintained so that the opening (c) of the first damper 23 may not be left in a state wherein it gets to and remains at the lower limit or upper-limit opening of a range (cx) of an adjustable opening limited to be small.

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).

[The problem that the invention attempts to solve]

However, when controlling the room pressure by controlling the opening of a single damper, large room pressure fluctuations may occur in the room to be ventilated, and the resistance of the filter installed in the forced ventilation air path may increase due to long-term use. If the airflow increases significantly due to clogging, the damper opening will be changed significantly by the opening control based on the room pressure detection, or the damper will have a change in airflow rate as shown in Figure 5. As shown by the broken line and solid line, there are characteristics that change non-proportionally, so if the opening degree of the damper is changed significantly, the adjustment characteristic of the damper's supply/exhaust balance for the room to be ventilated (unit quantity Even the rate of change in the ventilation amount (Q) with respect to the damper opening degree (C) changes significantly.

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.

In addition, in order to stabilize room pressure control in normal conditions while ensuring a wide range of room pressure control, we also provide opening control for the first damper, which is controlled by a room pressure controller based on room pressure detection. The capacity of the forced ventilation fan is controlled based on the detected room pressure and the detection of the opening of the first damper, so that the air supply and exhaust volume to the room to be ventilated is maintained within the limited opening range that does not change significantly due to the adjustment characteristics of the exhaust volume balance. It is possible to make basic adjustments to the balance of income and expenditure, but since it is necessary to equip a fan whose capacity can be controlled, the cost of the room pressure control system will be high. However, there is also the problem that sufficient adjustment accuracy and responsiveness cannot be obtained by controlling the fan's capacity.

The purpose of the present invention is to ensure a sufficiently large range of response to room pressure fluctuations 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. The aim is to stabilize pressure control.

[Means for solving problems]

The characteristic structure of the air conditioner according to the present invention is that the forced ventilation air passage has a first damper whose opening degree is controlled by a room pressure controller based on detected room pressure, and a second damper that adjusts the ventilation amount. is connected in parallel to the first damper, and the room pressure controller controls the I-th damper based on the detected room pressure by the room pressure sensor or based on the opening degree 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 opening within the set limit opening range, and its functions and effects 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
The air supply/exhaust balance for the room to be ventilated is basically adjusted by controlling the opening degree of the damper, and as a result, the air supply/exhaust flow balance for the I damper, which is used for fine adjustment of the air supply/exhaust flow balance, is adjusted based on the room pressure detected by the room pressure controller. The opening control is maintained within the set limit opening range, and the set limit opening range is as follows:
For the first damper, set an opening range in which the adjustment characteristics of the supply/exhaust volume balance for the room to be ventilated do not change significantly, that is, an opening range in which the rate of change in ventilation volume for a unit change in damper opening does not change significantly. I'll keep it.

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, it is greatly improved compared to the previous model that controlled the room pressure by controlling the opening of only one damper. .

Moreover, in order to maintain the opening degree control for the first damper within the set limit opening range, there may be times when the second damper is close to being fully closed. If they are connected in series, the forced ventilation passage or the second damper will restrict the ventilation excessively, and the relationship between the opening control of the first damper and the supply/exhaust balance adjustment will be disrupted, and as a result, the second damper will cause the first damper to Although the opening degree control is maintained within the set limit opening range, the accuracy of the room pressure control becomes low.

However, according to the present invention, the first damper and the second damper
Since the damper and the damper are connected in parallel, even if the second damper is close to being fully closed as described above, the first damper can be operated reliably.

〔Effect of the invention〕

Therefore, by having a sufficiently large room pressure control range, it will be able to sufficiently respond to large fluctuations in room pressure caused by any reason, as well as 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 developed an air conditioner that is highly reliable in terms of room pressure control.

Moreover, according to the present invention, the basic adjustment of the supply/exhaust volume balance for the room to be ventilated is performed by controlling the opening degree of the damper (second damper), which is advantageous in terms of system cost compared to a type that controls fan capacity. Moreover, compared to the type that originally controls the fan capacity, it is possible to ensure higher adjustment accuracy and response in the basic adjustment of air supply/exhaust volume balance, so it is possible to ensure high adjustment accuracy and high responsiveness in the basic adjustment of air supply and exhaust volume balance. In addition to improving responsiveness to fluctuations, the opening control range of the first damper can be maintained accurately, 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 FIG.
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 a portion of the supplied air to the air conditioner (2), thereby providing 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) is equipped with an air volume sensor (1O) and a damper (11) for adjusting the air volume. At the same time, it is equipped with an air volume controller (13) that automatically operates the air volume adjustment damper (11) so as to maintain the air volume detected by the air volume sensor (IO) at the air volume instructed by the system controller (12).

In addition, a branch exhaust path (1) connects each clean room (3) to an exhaust air path (l4) connected to an exhaust fan (6).
Each of 5) is equipped with a room pressure adjustment damper device (16) as a room pressure control means for each clean room (3), and a room pressure sensor (17) attached to each clean room (3) detects the pressure. Room pressure control 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 room pressure at the room pressure instructed by the system controller (12). vessel(
18) is equipped.

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 configured.

The air supply fan (4) is designed to maintain the air pressure detected by the air pressure sensor (19) attached to the air air supply path (8) at the air 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 (2L) attached to the exhaust air path (L4) 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 (l2).
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 a supply pressure such that the maximum opening of each damper (11) for adjusting the air volume is within the appropriate opening range set close to the full opening. 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 structure that instructs the exhaust pressure controller (22) to set an exhaust pressure that falls within a set appropriate intermediate opening range except for all damper openings, around full open openings, and around fully closed openings. It becomes.

In other words, regarding the supply pressure, the damper opening degree (a+) of each of the air volume adjustment dampers (II) fed back,
(a2). The maximum of (a3) and (a4) is the appropriate opening range (aX) as shown in Figure H2 (a).
When it deviates to the open side, the supply pressure is gradually increased, and the feedback air volume adjustment damper (
1l) Each damper opening (at). (ax). (a
a). If the maximum of (a4) is outside the set appropriate opening range (a As shown in Figure 2 (b), install the damper (1l) for adjusting the air volume.
Each damper opening (a.), (az) - (a3),
The air supply pressure is controlled to be maintained within the appropriate opening range (aX) set at the maximum of (a4) or close to the full opening/closing degree.

On the other hand, regarding the exhaust pressure, each damper device (16) for adjusting the room pressure receives feedback. Damper opening degree (bl
), (b2), (b.). When at least one of (b.) deviates from the appropriate intermediate opening range (bx) to the opening side as shown in Figure 3 (a), the exhaust pressure is gradually increased, and the feedback Damper opening degree (b.) of each damper device (l6) for damping room pressure adjustment
．． (b2). (b3). If at least one of (b4) deviates from the set appropriate intermediate opening range (bx) to the closing side as shown in Fig. 3(c), the exhaust pressure is gradually lowered, and as a result, the As shown in Figure 3 (+1), the damper opening degree (b.) of each damper device (16) for adjusting room pressure. (b2), cb3). Exhaust pressure control is performed so that the exhaust pressure is maintained within the set appropriate intermediate opening range (bx) except for all of (b.) near the fully open and near the fully closed openings.

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

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 ({). As shown in ([1), $
A first damper (23) and a second damper (24) are arranged in parallel and interposed in a branch exhaust path (15) that is a part of the forced ventilation air path for each clean room (3), and
and a second damper (23). Among (24), the first damper (23) is a damper that cannot completely close the air passage, that is,
The rotary valve body (23A) of the first damper (23)
) Even if the position is perpendicular to the rotary valve body (23A)
A bypass air passage (Fb) is formed between the damper casing (16A) and the damper casing (16A).
When the damper (24) is in a position perpendicular to the two rotary valve bodies (24A) or the air path (F2), the air path (F2)
) is configured as a damper that fully closes.

In other words, by configuring the first damper (23) so that it cannot be fully opened, the first damper (23) is configured such that it cannot be fully opened.
23) The opening adjustment range is set to a range (CX) in which the rate of change in ventilation volume (Q) with respect to a unit amount change in opening (C) does not change too much (CX), that is, adjustment of the supply/exhaust volume balance for the clean room (3). The characteristic is limited to a range (CX) in which the characteristics do not change too much, thereby controlling the first damper (23) to adjust the air supply/exhaust volume balance in order to stably adjust the room pressure against minute fluctuations in the room pressure. It is used as a damper for fine adjustment.

Also, a second damper that can be fully closed with respect to the first damper (23) is provided.
By connecting the dampers (24) in parallel, 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 range for adjusting the supply/exhaust volume balance for the clean room (3) is increased to ensure a wide range for adjusting the room pressure.

As a control system for the first and second dampers (23) and (24), the detection chamber pressure is controlled so as to maintain the chamber pressure detected by the chamber pressure sensor (17) at the chamber pressure instructed by the system controller (12). The above-mentioned room pressure controller (18) is provided as a controller that controls the opening of the first damper (23) based on the detection of the room pressure. ) is unable to fully close the opening control of the first damper (23).
The angle θ formed by the rotary valve body (23A) with respect to the air path (F) direction is in the range of 06 to 90 degrees), that is, the above-mentioned limit opening is set so that the adjustment characteristics of the air supply and exhaust volume balance do not change too much. A basic room pressure controller (18A) that also 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 temperature range (CX).
is attached to the room pressure controller (18).

In other words, as shown in Figure 6, the system controller (
The difference value (ΔP=P) between the room pressure value (PO) indicated by l2) and the room pressure value (PX) detected by the room pressure sensor
x-Pa) increases on the positive side (Px>Po), the opening degree (c) of the first damper (23) increases, and as the difference value (ΔP) increases on the negative side (Px < Po), the opening degree (c) of the first damper (23) increases. By controlling the opening of the first damper (23) using the room pressure controller (18) so as to reduce the opening (C) of the first damper (23), the supply and exhaust amount balance for the clean room (3) can be finely adjusted. Is it adjusted to maintain the detection chamber pressure at the chamber pressure indicated by the system controller (l2)?
The opening degree of the I-th damper (23) is controlled by the room pressure controller (18), and the allowable fluctuation range (d) of the differential value (ΔP) is set to maintain it within the above-mentioned limit opening range (CX). , difference value (ΔP
) deviates from the upper limit (ΔPmax) of the allowable variation range (d), the opening degree (b) of the second damper (24) is increased according to the amount of deviation, and the difference value (ΔP) The basic room pressure controller (18A) is configured to reduce the opening degree (b) of the second damper (24) when the lower limit (ΔPmin) of the allowable fluctuation width (a) is deviated from.
By controlling the opening of the second damper (24) and basically adjusting the supply/exhaust balance for the clean room (3), as a result of this basic adjustment, the ■ and ◎ parts in Figure 6 In other words, the opening degree of the first damper (23) by the room pressure controller (18) is controlled as described above so as to maintain the difference value (ΔP) within the allowable fluctuation range (d) as shown in FIG. The opening degree is maintained within the limited opening range (cx).

Each opening degree (40°, 50°6) of the second damper (24)
The first damper (23
) is shown in Figure 7.

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 range of room pressure control, and prevents large fluctuations in room pressure caused by any cause, and the need for intervening ventilation passages. 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 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 is set as.

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). (2
4M) or room pressure controller (18) and basic room pressure controller (18)
A) is automatically operated.

The damper opening degree of the room pressure adjustment damper device (l6) that feeds back to the system controller (l2) 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/closed 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),
6) is used for the basic adjustment of supply/exhaust income and expenditure for the clean room (3), which is more basic than the opening degree control of the second damper (24) by the basic room pressure controller (18A). The opening control of the second damper (24) by the basic room pressure controller (18A) is also maintained at an intermediate opening that does not change much, probably due to the supply/exhaust volume balance adjustment characteristic of the second damper (24). As a result, the power consumption of the exhaust fan (6) can be reduced and the room pressure control can be made more stable.

[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 setting limit that does not change the adjustment characteristics of the supply and exhaust amount balance too much. The opening degree of the first damper (23) is mechanically limited to the opening range (cx), and the opening degree of the first damper (23) by the room pressure controller (18) is limited to the appropriate opening adjustment range of the first damper (23). The aforementioned setting limit opening range (CX)
However, as shown in Fig. 8, the first damper (23) is a normal damper that can be fully closed, and the The lift damper (24) is controlled by the room pressure controller (18) by basically adjusting the supply/exhaust volume balance by controlling the opening of the 2 damper (24).
By maintaining the opening control of the first damper (23) within the set limit opening range (CX), in other words, the operating range of the first damper (23) can be controlled so that the adjustment characteristics of the supply and exhaust amount balance do not become too large. The opening angle is limited within the setting limit opening range (in the example shown in Figure 8, the angle θ formed by the rotary valve body (23A) with respect to the air path (F1) direction is within the range of about 0° to 40°). Also good.

In addition, the first damper (23) cannot be fully closed, and the opening adjustment range of the first damper (23) is set as a limited opening range m (
cx), the mechanical restriction configuration is such that the rotary valve body (23A) of the No. I damper (23) or the air passage (F) is If a configuration is adopted in which a bypass air passage (Fb) is formed even if the orientation is orthogonal, the rotation corresponding to the set limit opening range (CX) that does not significantly change the adjustment characteristics of the air supply/displacement balance. The operating range of the valve body (23A) is the air path (
F) Angle θ or 0 formed by the rotary valve body (23A) with respect to the direction
Because it has a large operating range from ° to 90 °,
There is an advantage that the fine adjustment accuracy of the chamber pressure can be increased by the opening degree control @ (rotation angle control) of the first damper (23).

In addition, in forming such a bypass air passage (Pb), as shown in FIG. 9, a ventilation hole (25) should be formed in the valve body (23A) of the first damper (23). Alternatively, as shown in FIG. 10, it is also conceivable to provide an external bypass duct (2G) for the first damper (23).

In the first damper (23), the adjustment characteristics of the air supply/exhaust volume balance (i.e., the rate of change in the ventilation volume (Q) with respect to the change in the unit volume of the opening (C)) within the opening range from the full opening of the air passage to the full opening of the air passage. ) or the limited opening range that does not change too much (cx)
The width to be set in the part may be determined as necessary, and in some cases, as shown in Figure If, the width may be set in the fully open side part, or the 12th
As shown in the figure, 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.

The basic room pressure controller (18A) maintains the opening control of the first damper (23) by the room pressure controller (18) based on room pressure detection within the set limit opening range (aX). 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). The damper (24) may be configured to control the opening degree, and 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 (I8) and the basic room pressure controller 08A) can be modified in various ways, such as a structure using a microcomputer or a structure that is removed from 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 performing room pressure control to maintain the detected room pressure at the room pressure instructed by the system controller (I2) as adopted in the above embodiment, 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, example 4 is an application of the technology of the present invention. An air volume controller is provided which controls the opening of the first damper so as to maintain the detected air volume at a set air volume based on the air volume detected by the air volume sensor installed in the air passage system, which is equipped with a damper; The airflow rate detection or the opening degree detection of the first damper is performed so that the opening control of the first damper by the airflow controller is maintained within the set limit opening range where the airflow adjustment characteristics of the first damper do not change significantly. A basic air volume controller is provided to control the opening of the second damper based on the
Therefore, it is also possible to stabilize the air volume control.

It should be noted that the present invention is not limited to the structure shown in the accompanying drawings by adding reference numerals in the claims for convenient comparison with the drawings.

[Brief explanation of drawings]

! 1 to 7 show embodiments of the present invention, FIG. I is a system diagram showing the overall configuration, and FIG. 2 (4). (O). (c) is a diagram explaining the air supply pressure control, Figure 3 ({), ([+
). (c) is a diagram explaining exhaust pressure control, Fig. 4 ({).
(D) is an enlarged view of the damper device for adjusting room pressure, FIG. 5 is a graph showing the adjustment characteristics of the first damper, FIG. 6 is a view showing the room pressure control form, and FIG. 7 is a diagram of the damper characteristics. 8th
8 through 12 show different embodiments of the present invention, respectively.
10 through 10 are enlarged views of the damper device for adjusting room pressure, and FIGS. 11 and 12 are graphs showing the adjustment characteristics of the first damper, respectively. (3)...Room to be ventilated, (15)...
Forced ventilation air path, (17)...Room pressure sensor, (
18)...Room pressure controller, (18A)...
・Basic room pressure controller, (23)...1st damper, (24)...2nd damper, (CX)...
...Setting limit opening range. Fig. 10 1b Fig. 11 Fig. 12 Draft procedure amendment (method) 1990 Patent Application No. 252984 2 Name of the invention Game σ Adjustment device 3 Person making the amendment Relationship with the case

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
), a second damper (24) for adjusting the ventilation amount is attached to the first damper (24).
The damper (23) is connected in parallel to the damper (23), and the first
a basic room pressure controller that controls the opening of the second damper (24) so that the opening of the room pressure controller (18) with respect to the damper (23) is maintained within a set limit opening range (cx); (18A) Air conditioner equipped with.