JPH0440617B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioning system, and in particular, for example,
This article relates to an air conditioning system that uses the VAV (Variable Air Volume) method to achieve energy-saving operation.

[Prior art]

For example, air conditioning systems using conventional VAV units are disclosed in JP-A-59-32732 and JP-A-57-196029.

In the former conventional technology, the air blowing capacity is reduced when all the VAV units (dampers) are not fully opened, and when any one VAV unit becomes overly open, the air blowing capacity is increased. The blower is controlled to maintain the blowing capacity when the unit is fully open.

The latter conventional technology reduces the air blowing capacity when all VAV units are not fully open, increases the air blowing capacity when any one VAV unit is fully open and there is insufficient air volume, and Controls the blower to maintain the blowing capacity when the VAV unit is fully open.

[Problem to be solved by the invention]

In the former conventional technique, the overall air volume is changed based on the status of only one unit, ignoring the overall status, which tends to cause large fluctuations in the air volume change. In other words, if any one VAV unit becomes over-open, the air flow from the blower will be increased immediately, so all the dampers will become less than fully open again, and even if the air volume is increased, the air volume will have to be reduced immediately. ,
This causes fluctuations in air volume.
Such a undulating phenomenon is not only unfavorable for energy saving, but also causes other problems in terms of comfort. That is, in the former conventional technology,
Since it is not possible to set a dead zone when controlling the air blowing capacity, fluctuations in air volume cannot be resolved.

In addition, in the former conventional technology, the air volume (wind speed)
Since there is no sensor, the opening degree of the damper (switcher) is determined primarily by the required air volume from the thermostat, so it is necessary to make the rate of increase/decrease in the air blowing capacity equal to the rate of change in indoor temperature. However, the rate of change in indoor temperature is much slower than the rate of change in air volume, so when the indoor temperature setting is changed, another VAV unit goes from operation to fully closed, or When the machine starts operating, the change in air blowing capacity becomes unable to follow these changes. On the other hand, if the rate of change in the air blowing capacity is set to such a rate that it can follow these changes, a state of excessive control will occur, and in that case, large fluctuations in the air volume change will occur. Furthermore, since the air blowing capacity is always controlled to increase or decrease near the maximum required air volume, the temperature control range in the VAV unit is effectively narrowed, making stable control difficult and reducing the energy-saving effect of the VAV system. It's starting to fade.

In addition, in the latter conventional technology, an air volume sensor is provided, and the air volume signal measured by this wind speed sensor is compared with the air volume signal set in the required air volume setting device to control the throttle valve, so only a temperature sensor is used. Compared to the former prior art which does not have this, it has advantages such as being able to provide a dead zone in controlling the air blowing capacity.

However, in the latter conventional technology, in order to increase the air blowing capacity, it is necessary to detect "insufficient air volume", and this air volume deficiency is determined from the deviation between the required air volume and the actual air volume, so the dead zone is set large. There must be. That is, in an actual duct, the wind speed changes greatly, and therefore stable control cannot be achieved unless a large dead zone is set. On the other hand, if a large dead zone is set, even if the load in the room increases and the damper is fully opened, the required sealing amount will often not be satisfied immediately. Therefore, when a dead zone is set in the latter conventional technique, another problem arises in that the responsiveness deteriorates.

Therefore, the main object of the present invention is to provide an air conditioning system that can achieve energy-saving operation without sacrificing comfort and has excellent responsiveness.

[Means to solve the problem]

A first invention is an air conditioning system in which a main duct extending from an air conditioner is branched into a plurality of branch ducts, and a damper is provided in each branch duct to adjust the amount of air passing therethrough. An air volume measuring means is installed in connection with the duct and measures the air volume or wind speed of the corresponding branch duct. Based on the actual air volume signal from the air volume measuring means and the required air volume signal from a temperature sensor, etc., the system automatically opens when the air volume is insufficient. a damper control means for operating the damper in the closing direction when the air volume is excessive; and a damper control means for operating the damper in the closing direction when the air volume is excessive; a first signal provided in connection with each damper and outputting a first signal when the opening degree of the corresponding damper is substantially 100%; First thing to do
The signal generation means is provided in relation to each damper, and the opening degree of the corresponding damper is less than 100% and 100%.
a second signal generating means that outputs a second signal when the amount is equal to or greater than a predetermined amount in the vicinity; and when there is a first signal from any one of the first signal generating means, the air blowing capacity of the air conditioner is increased; A blowing capacity control means is provided that reduces the blowing capacity of the air conditioner when there is no second signal from any of the signal generating means, and does not change the blowing capacity of the air conditioner in other conditions.
The second invention, which is an air conditioning system, is an air conditioning system in which a main duct extending from an air conditioner is branched into a plurality of branch ducts, and a damper is provided in each branch duct to adjust the amount of air passing therethrough. An air volume measuring means provided in connection with each branch duct to measure the air volume or wind speed of the corresponding branch duct, based on an actual air volume signal from the air volume measuring means and a required air volume signal from a temperature sensor, etc. , a damper control means for operating the damper in the open direction when the air volume is insufficient, and in the closing direction when the air volume is excessive, provided in connection with each damper and when the opening degree of the corresponding damper is substantially 100%. A first signal generating means for outputting a first signal, which is provided in association with each damper and outputs a second signal when the opening degree of the corresponding damper is less than 100% and less than a predetermined amount in the vicinity of 100%. Second
signal generating means, and increases the air blowing capacity of the air conditioner when there is a first signal from any one of the first signal generating means, and increases the air blowing capacity of the air conditioner when there is a second signal from all the second signal generating means. This air conditioning system includes an air blowing capacity control means that reduces the air blowing capacity and does not change the air blowing capacity of an air conditioner under other conditions.

[Effect]

In the damper control means, depending on the actual air volume signal from the air volume measurement means and the required air volume signal from the temperature sensor, etc., the damper opening degree is changed in the open direction when the air volume is insufficient, and in the closed direction when the air volume is excessive. However, when the air volume is sufficient (a slight difference between the actual air volume and the required air volume is considered sufficient; that is, there is a dead zone), the damper opening is not changed. A first signal generating means and a second signal generating means are provided in relation to the opening degree of the damper, and the first signal generating means outputs a first signal when the corresponding damper is fully open or overly open. The second signal generation means is 100% of the corresponding damper.
When the predetermined opening degree is less than 100% and is near 100%, for example, 90% or more, the second signal is output. However, in the second invention, the second signal is output when it is 90% or less. The blowing capacity control means increases the blowing capacity when at least one first signal is output, that is, when at least one of the plurality of dampers is fully open or overly open. Further, when the second signal is checked and the opening degrees of all the dampers have not reached, for example, 90%, the air blowing capacity is reduced. Furthermore, the air blowing capacity is not changed in any state other than the above.

That is, in this invention, the damper opening is controlled with a predetermined dead zone depending on the difference between the required air volume and the actual air volume, and a predetermined dead zone other than the above is controlled depending on the damper opening. The air blowing capacity is controlled to increase or decrease.

〔Effect of the invention〕

According to this invention, the above-mentioned Japanese Unexamined Patent Publication No. 59-
Unlike No. 32732 and JP-A No. 57-196029, there is no direct relationship between the required air volume, i.e., indoor temperature, etc., and the increase or decrease in air blowing capacity. Even if a blowing capacity control speed with good responsiveness is set, a state of excessive control will not occur, and therefore no fluctuations in air volume change will occur. Furthermore, since the damper can be fully opened if the actual air volume is less than the required air volume, the air blowing capacity can be increased or decreased even when the required air volume is small, which is even more advantageous in terms of energy saving. Furthermore, unlike JP-A No. 57-196029, the air blowing capacity is increased, decreased, or maintained as it is based on the damper opening degree, which moves slowly, rather than the air volume signal, which fluctuates rapidly, and by providing an indifferent zone. As a result, very stable control can be achieved. Furthermore, a dead zone is set that utilizes the slow movement of the damper near 100%, where changes in air volume are small, so control stability can be further improved.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. Air conditioning system 10 includes one or central air conditioner 12 . It should be pointed out in advance that the present invention is applicable not only to such a central type but also to a multi-level type.

In the air conditioner 12, the blower 14 may be of a centrifugal type or any other suitable type. The outlet of this blower 14 is connected to the main duct 16 through a suitable scroll damper (not shown). From this main duct 16, each chamber 18, 1
Branch ducts 20, 20, . . . are provided for 8, . . . , and air is supplied from these branch ducts 20, 20, .

Inside each branch duct 20, a post 22 having a circular or rectangular cross section is arranged in a direction perpendicular to the air flow direction of each branch duct 20. This post 22 causes a Karman vortex 24 downstream of the post 22 due to the air flow generated in the branch duct 20 . In order to detect this Karman vortex 24, an ultrasonic transmitter 26 and a receiver 2 are placed opposite each other across the branch duct 20 at that position.
8 is provided. An airflow measuring device 30 is connected to the ultrasonic transmitter 26 and the receiver 28, and the airflow measuring device 30 measures the airflow by detecting the phase of the ultrasonic wave signal, for example. More specifically, when the Karman vortex 24 is generated, the flow direction of the vortex is reversed on the left and right sides of the post, and the ultrasonic signal transmitted from the ultrasonic transmitter 26 reaches the ultrasonic receiver 28 with a certain time difference. reach. Therefore, the air volume measuring device 30 detects the period of change in the time difference from the timing at which a transmission pulse is given to the ultrasonic transmitter to the timing at which a reception signal is obtained from the ultrasonic receiver 28. If the period of change in the time difference is long, it can be determined that the air volume is small, and if the period of change is short, it can be determined that the air volume is large. It goes without saying that instead of detecting such a phase, the air volume may be measured by detecting a change in the amplitude or a change in frequency of the ultrasonic signal due to the Karman vortex 24.

The airflow measuring device 30 provides a voltage signal having a magnitude corresponding to the airflow to the damper controller 32 . Such a voltage may be applied, for example, in the range 0-10V. On the other hand, each chamber 18 has a temperature sensor 34.
The temperature sensor 34 provides the damper controller 32 with a voltage signal having a magnitude according to the difference between the indoor temperature and the set temperature, that is, the magnitude of the temperature deviation. The voltage signal from this temperature sensor 34 is also given, for example, in the range of 0 to 10V. The damper controller 32 controls the opening degree of the damper 36 provided in each branch duct 20 according to these two voltage signals.
It is controlled by a damper drive motor circuit 38.
For example, when the voltage signal from the air flow meter 30 is larger than the voltage signal from the temperature sensor 34, the damper controller 32 provides a signal to the damper drive motor circuit 38 to close the damper 36. Conversely, if the voltage signal from the temperature sensor 34 is larger than the voltage signal from the airflow measuring device 30, a signal is given to open the damper 36. If both voltage signals are the same, damper controller 32 and damper drive motor circuit 38 will maintain damper 36 in its current state.

The damper driving motor circuit 38 includes, for example, a synchro motor whose shaft is connected to the shaft of the damper 36, and when the shaft of this synchro motor (not shown) rotates by, for example, 69 degrees, the damper 36 is rotated, for example, by 69 degrees. Can be rotated within a range of 60°. The die driving motor circuit 38 is provided with first and second signal generating means in relation to the output shaft of the motor (not shown), and the signals from these circuits 38 are sent to the motor control circuit 40. Given. In this motor control circuit 40, the applied first signal and/or
Alternatively, in response to the second signal, for example, the blower drive motor 42 is controlled in order to adjust the air volume or air blowing capacity as described later.

The blower drive motor 42 is a normal induction motor, and rotates the fan of the blower 14. The motor control circuit 40 is further connected to a motor 44 for driving an inlet vane (not shown) of the blower 14 and a motor 46 for driving a scroll damper (not shown) of the air conditioner 12. has been done. However, in this embodiment, the motor control circuit 40 mainly controls the rotational speed of the blower drive motor 42.

Next, with reference to FIG. 2, the damper driving motor circuit 38 and motor control circuit 40, which are characteristic of the embodiment shown in FIG. 1, will be explained. Each damper driving motor circuit 38 is connected to the output shaft of a motor (not shown) or the shaft of the damper 36 (FIG. 1), and the opening degree of the corresponding damper 36 is substantially controlled.
It includes a first contact 48 that is turned on when the voltage reaches 100%, and this first contact 48 includes a diode 50.
is connected. The motor circuit 38 further includes a second motor circuit that is turned on when the opening degree of the corresponding damper 36 reaches a predetermined amount less than 100%, for example, 90% or more.
A diode 54 is directly connected to the contact 52. Here, the diode 50
and 54 are arranged in opposite directions.
The series connection between the first contact 48 and the diode 50 and the series connection between the second contact 52 and the diode 54 are connected in parallel, and both ends of each parallel connection are connected to a reception controller 56 included in the motor control circuit 40. are connected to the two terminals of the

The reception controller 56 includes, for example, a C-MOS bidirectional switch, and alternately switches the polarity of the voltage at two terminals of the reception controller 56. Therefore, a forward voltage is alternately applied from the reception controller 56 to each series connection included in the damper drive motor circuit 38. For example, when (+) is applied to one terminal, the series connection between the first contact 48 and the diode 50 becomes forward, and the second
The series connection between the contact 52 and the diode 54 is in the opposite direction. Conversely, when (-) is applied to one terminal, the series connection between the second contact 52 and the diode 54 acts as a forward direction, and the series connection between the first contact 48 and the diode 50 acts as a reverse direction. . Therefore, when (+) is applied to one terminal, the plurality of circuits 38, 38,
If any one of the first contacts 48 is turned on, that is, if the opening degree of any one of the dampers 36 is 100%, the reception controller 5
6 is given a voltage signal of a certain value, that is, a first signal. And also, when (-) is given to that one terminal, each second contact 52
If any one of the dampers 36 is turned on, that is, if any one of the dampers 36 is opened by a predetermined amount less than 100%, for example, 90%, a voltage signal, that is, a second signal is given to the reception controller 56.

Such a voltage signal is provided to the first signal receiver 58 or the second signal receiver 60 through a bidirectional switch (not shown) of the reception controller 56. The first signal receiver 58 includes one of the reception controllers 56.
A switching signal that becomes high level when one terminal is set to (+) is provided, and the inverted signal is provided to the second signal receiver 60, which is ANDed with the received voltage signal. Therefore, the first signal receiver 58 receives a first signal, that is, a signal indicating that the damper opening is 100%, and the second signal receiver 60 receives a second signal, that is, a signal that indicates that the damper opening is 90%, for example. A signal representing .

The first signal from the first signal receiver 58 is given as a tria signal to a monostable multivibrator 64 included in the floating control circuit 62, and the second
A second signal from signal receiver 60 is provided as a trigger signal for monostable multivibrator 66 . The floating control circuit 62 includes an inverter 6 for driving the blower drive motor 42 (FIG. 1).
8 for "floating control". When the outputs of the two monostable multivibrators 64 and 66 are both at low level, the floating control circuit 62 reduces the oscillation frequency of the inverter 68. When the signal from one monostable multivibrator 64 is high level, at this time, the other monostable multivibrator 6
The signal from inverter 68 is also at high level, but the oscillation frequency of inverter 68 is increased. Conversely, when only the output of the monostable multivibrator 66 is at a high level, the floating control circuit 62 maintains the oscillation frequency of the inverter 68 as it is.

If the frequency of the inverter 68 is increased, the rotational speed of the blower drive motor 42 (FIG. 1) increases, and the amount of air sent out from the blower 14, that is, the blowing capacity, increases. Conversely, when the frequency of the inverter 68 is low, the number of revolutions of the motor 42 is also low, and the amount of air blown, that is, the ability to blow air, decreases.

A first contact 48 configured as shown in FIG.
By using the motor circuit 38 including the second contact 52, the diodes 50 and 54, and the receiver controller 56, the VAV unit and the motor control circuit 40 are connected to each other in order to detect the first signal and the second signal. The configuration is very simple, as all you need to do is connect it with a cable.

In operation, one branch duct 20 (first
When the opening degree of the damper 36 in FIG. 2 is 100% (fully open), either the first contact 48 or the second contact 52 (FIG. 2) is turned on. Therefore, the first signal receiver 58 included in the motor control circuit 40
and the second signal receiver 60 respectively have a first
The signal and the second signal are received, and a high level is output from the monostable multivibrators 64 and 66 in response to the floating control circuit 62.
increases the oscillation frequency of the inverter 68.
Therefore, the rotation speed of the blower drive motor 42 is increased, and the amount of air blown from the blower 14 is increased. That is, although it may be sufficient for any of the dampers to be fully open, in most cases, it is considered that the amount of air blown from the air conditioner 12 as a whole is insufficient. Therefore, in this case, the amount of air blown is increased in accordance with the first signal.

If any damper 36 is opened less than 90%, all second contacts 52
remains off. At this time, the first contact 4
8 are also all off. Therefore, both the first signal receiver 58 and the second signal receiver 60 receive no signal, and the outputs of the monostable multivibrators 64 and 66 are both at a low level. Therefore, the floating control circuit 62 controls the oscillation frequency of the inverter 68 to decrease, and the rotation speed of the blower drive motor 42 decreases. Therefore, the amount of air from the blower 14 is reduced. In this way, if either damper is in a state of less than 90%, it means that the air blowing capacity of the air conditioner 12 is too large, and in this case, in response to the absence of the second signal, Reduce air blowing capacity.

If none of the dampers are fully open, but at least one damper is opened by 90% or more, the overall air blowing capacity is too large. However, in this case, since the signal is received by the second signal receiver 60, the floating control circuit 62 does not perform control to change the oscillation frequency of the inverter 68. Therefore, in this case, the rotational speed of the blower drive motor 42 is maintained as it is. That is, the motor control circuit 40 controls the rotation speed of the blower drive motor 42, that is, the rotation speed of the blower 14, except when any one damper is fully open or when all dampers are opened at 90% or less. No control is performed to change the amount of air blown. Generally, when the VAV unit is fully open, there is little change in air volume with respect to changes in damper opening. For example, when the opening degree is 95%, the air volume is reduced by 1 to 2% compared to the air volume when fully opened, and at 90%, the air volume is reduced by 3 to 4%. Therefore, even with the system of this embodiment. No practical problems arise.

FIG. 3 is a schematic block diagram showing a modification of the embodiment of FIG. 2. Figure 3 shows that the second
The difference is that the contact is configured as a normally closed contact 52b, and a polarity inverter 59 is inserted between the reception controller 56 and the second signal receiver 60.

In the example of FIG. 3, the first signal can be detected in the same manner as the embodiment of FIG.

Regarding the second signal, the opening degree of the corresponding damper is
It is detected by the normally closed contact 52b, which is turned on when the amount is less than 100%, for example, 90%, and turned off when it exceeds 90%. To explain in detail, when the reception controller 56 included in the motor control circuit 40 applies a polarity voltage that makes the diode 54 forward, if the opening degrees of all dampers are 90% or less, each The contact 52b is turned on, and the reception controller 56 outputs a constant voltage signal. However, since the voltage signal is inverted by the polarity inverter 59, the second signal receiver 60 is not provided with the voltage signal. On the other hand, since all contacts 48 are off, no voltage signal is applied to the first signal receiver 58 either. Therefore, in this state, both monostable multivibrators 64 and 66 output to low level. Therefore, the floating control circuit 62 reduces the oscillation frequency of the inverter 68, as in the embodiment of FIG. depending on,
The rotation speed of the blower drive motor 42 is reduced,
The air blowing capacity of the air conditioner 12 is reduced.

When the opening degree of any one of the dampers exceeds 90%, one of the corresponding contacts 52b is turned off, so a constant voltage signal is given to the second signal receiver 60 through the polarity inverter 59. The stable multivibrator 66 outputs a high level. However, the air blowing capacity of the air conditioner 12 is not increased unless any of the dampers is fully opened.

Then, when the opening degree of any damper reaches 100%, the air blowing capacity is increased.

FIG. 4 is a schematic block diagram showing another modification of the embodiment of FIG. 2. Figure 4 shows that compared to Figure 2,
The difference is that the first contact is configured as a normally closed contact 48b, and a polarity inverter 57 is inserted between the reception controller 56 and the first signal receiver 58.

In the example of FIG. 4, for the second signal, the second
It can be detected in the same manner as in the illustrated embodiment.

Regarding the first signal, the opening degree of the corresponding damper is
This is detected by the normally closed contact 48b, which is turned on while it does not reach 100% and turned off when it reaches 100%. To explain in detail, when the receiving controller 56 included in the motor control circuit 40 applies a voltage with a polarity that causes the diode 52 to move in the forward direction, when the opening degree of any damper reaches 100%, the corresponding response occurs. The contact 48b is turned off, and no voltage signal is output from the reception controller 56. However, the polarity inverter 5
7 provides a constant voltage signal to the second signal receiver 58. On the other hand, all contacts 52 are turned on. Therefore, in this state,
Both monostable multivibrators 62 and 66 output high level. Therefore, the floating control circuit 62 increases the oscillation frequency of the inverter 68, as in the embodiment of FIG.
Accordingly, the air blowing capacity of the air conditioner 12 is increased.

When the opening degree of all dampers becomes 90% or less, all contacts 52 are turned off, no voltage signal is given to the second signal receiver 60, and a low level is output from the monostable multivibrator 66. Ru. At this time, the output of the first signal receiver 58, that is, the output of the monostable multivibrator 62, is also at a low level. Therefore, in this state, the air blowing capacity of the air conditioner 12 is reduced as in the previous embodiment.

FIG. 5 is a schematic block diagram showing another modification of the embodiment of FIG. 2. In comparison with FIG. 2, FIG. 5 does not use a diode, and moreover, the second contact is configured as a normally closed contact 52b and the first contact 48
The difference is that the and second contact 52b are configured as separate circuits. That is, in the example of FIG. 5, the respective contacts 48 are commonly connected to the reception controller 56a in parallel (in an OR manner), and
The respective contacts 52b are arranged in series with each other (AND
mode) is connected to the reception controller 65b. In this embodiment, the reception controllers 56a and 56b are not provided with polarity switching means, but only with voltage application means. A polarity inverter 59 is inserted between the reception controller 56b and the second signal receiver 60.

In the embodiment shown in FIG. 5, when any damper is fully opened, the corresponding contact 48 is turned on, and a constant voltage signal is input to the first signal receiver 58. However, since one of the contacts 52b is turned off, no voltage signal is output from the reception controller 56b, but a voltage signal is input to the second signal receiver 60 due to the action of the polarity inverter 59. Ru. Therefore, in this state, both monostable multivibrators 62 and 66 output high level. Therefore, the floating control circuit 62 increases the oscillation frequency of the inverter 68, similar to the embodiment in FIG. Accordingly, the air blowing capacity of the air conditioner 12 is increased.

When the opening degrees of all dampers become 90% or less, all contacts 48 are turned off and all contacts 52b are turned on. Therefore, a voltage signal is output from the reception controller 56b. However, due to the action of the polarity inverter 59, no voltage signal is input to the second signal receiver 60. At this time, the voltage signal is not applied to the first signal receiver 58 either, and the monostable multivibrators 64 and 66 both output a low level. Therefore, similar to the previous embodiment, the air blowing capacity of the air conditioner 12 is reduced.

In the embodiment of FIG. 5, the second contact point is
It will be readily appreciated that the same contacts 52 as in the illustrated embodiment can be used.

FIG. 6 is a schematic block diagram showing a modification of the embodiment of FIG. 5. In this embodiment, a contact 52 is used in place of the contact 52b included in the damper drive motor opening 38 shown in FIG.
This embodiment differs from the embodiment shown in FIG. 5 in that there are only three wires, and that the diode 59 between the reception controller 56 and the second signal receiver 60 shown in FIG. 5 is omitted. The rest of the structure and overall operation of this embodiment are the same as those of the embodiment shown in FIG. 5, and redundant explanation will be omitted here.

According to the embodiment of FIG. 6, there is an advantage that the number of connecting wires can be reduced, and therefore, the chances of miswiring can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. FIG. 2 is a schematic block diagram for explaining the main parts of the embodiment shown in FIG. Figures 3 to 5
Each figure is a schematic block diagram showing a modification of the embodiment of FIG. 2. FIG. 6 is a schematic block diagram showing a modification of the embodiment of FIG. 5. In the figure, 10 is a central air conditioning system, 12
is an air conditioner, 14 is a blower, 16 is a main duct,
20 is a branch duct, 30 is an air flow measuring device, 32 is a damper controller, 36 is a damper, 38 is a damper drive motor circuit, 40 is a motor control circuit, 42 is a blower drive motor, 48, 48b are first contacts , 5
0, 54 are diodes, 52, 52b are second contacts, 56, 56a, 56b are reception controllers, 57,
59 is a polarity inverter, 58 is a first signal receiver, 60
62 is a floating control circuit, and 68 is an inverter.

Claims (1)

[Scope of Claims] 1. An air conditioning system in which a main duct extending from an air conditioner is branched into a plurality of branch ducts, and a damper provided in each branch duct to adjust the amount of air passing therethrough, comprising: It includes an air volume measuring means that is provided in association with each branch duct and measures the air volume or wind speed of the corresponding branch duct, and based on the actual air volume signal from the air volume measuring means and the required air volume signal from a temperature sensor, etc. Damper control means for operating the damper in the opening direction when the air volume is insufficient and in the closing direction when the air volume is excessive, provided in association with each of the dampers, so as to control the opening degree of the corresponding damper to substantially 100%. a first signal generating means for outputting a first signal when the opening degree of the corresponding damper is less than 100% and a predetermined amount or more in the vicinity of 100%; a second signal generating means for outputting a second signal generating means, and increasing the air blowing capacity of the air conditioner when there is a first signal from any one of the first signal generating means; An air conditioning system comprising an air blowing capacity control means that reduces the air blowing capacity of the air conditioner when there is no second signal, and does not change the air blowing capacity of the air conditioner in other conditions. 2. The air conditioning system according to claim 1, wherein each of the branch ducts includes a VAV unit, and the air volume adjusting damper is included in the VAV unit. 3. The first signal generating means includes a first contact that is turned on when the damper opening is substantially 100%;
a first diode connected in series to the first contact, and the second signal generating means is configured to detect an opening degree of the damper.
a second contact that is turned on when a predetermined amount is less than 100%, and a second diode that is connected in series to the second contact in a direction opposite to that of the first diode; and the first diode, and a series connection between the second contact and the second diode are connected in parallel, and by applying DC voltages of different polarities from both ends of the parallel connection, the first The air conditioning system according to claim 1 or 2, wherein the signal and the second signal are detected at different timings. 4. An air conditioning system in which a main duct extending from an air conditioner is branched into a plurality of branch ducts, and a damper is installed in each branch duct to adjust the amount of air passing through the damper, and and includes an air volume measuring means for measuring the air volume or wind speed of the corresponding branch duct, and based on the actual air volume signal from the air volume measuring means and the required air volume signal from a temperature sensor, etc., the opening direction is changed when the air volume is insufficient. damper control means for operating each of the dampers in the closing direction when the air volume is excessive; and damper control means provided in association with each of the dampers and configured to generate a first signal when the corresponding damper opening is substantially 100%. a first signal generating means for outputting a second signal provided in association with each of the dampers and outputting a second signal when the opening degree of the corresponding damper is less than 100% and less than a predetermined amount in the vicinity of 100%; generating means; and increasing the blowing capacity of the air conditioner when there is a first signal from any one of the first signal generating means, and increasing the blowing capacity of the air conditioner when there is the second signal from all the second signal generating means. An air conditioning system comprising an air blowing capacity control means that reduces the air blowing capacity of an air conditioner and does not change the air blowing capacity of the air conditioner under other conditions. 5. The air conditioning system according to claim 4, wherein each of the branch ducts includes a VAV unit, and the air volume adjusting damper is included in the VAV unit. 6. The first signal generating means includes a first contact that is turned on when the damper opening is substantially 100%;
a first diode connected in series to the first contact, and the second signal generating means is configured to detect an opening degree of the damper.
a second contact that is turned off when the amount is less than a predetermined amount less than 100%; and a second diode connected in series to the second contact in a direction opposite to that of the first diode; and the first diode, and a series connection between the second contact and the second diode are connected in parallel, and by applying DC voltages of different polarities from both ends of the parallel connection, the first The air conditioning system according to claim 4 or 5, wherein the signal and the second signal are detected at different timings.