JPS61130747A - Air conditioning system - Google Patents

Abstract

PURPOSE:To intend to carry out an energy saving operation without impairing comfortableness by increasing the air blowing ability when any of dampers is in a fully opened state and the whole quantity of air flow is deficient, and decreasing the air flowing ability when any of dampers is not in a fully opened state and the whole quantity of air flow is excessive. CONSTITUTION:A voltage signal having a magnitude in conformity with the quantity of air flow from an air flow quantity measuring apparatus 30 is given to a damper controller 32. On the other hand, a temperature sensor 34 is provided in each chamber 18, and a voltage signal having a magnitude in conformity with the size of a difference between an indoor temperature and a set temperature, that is, a temperature deviation is given from the temperature sensor 34 to a damper controller 32. In accordance with these two voltage signals, the opening degree of a damper 26 provided in each branched duct 20 is controlled by a damper driving motor 36. A signal from a circuit 38 is given to a motor control circuit 40. The motor control circuit 40 controls a blower driving motor 42 for adjusting the air flow quantity or the blasting ability in accordance with these given signals.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to air conditioning systems, particularly for example VAV
The present invention relates to a space system that achieves energy-saving operation in a variable air volume (Variable Air Volume) system.

(Prior art) Regarding control for energy saving in a VAV type air conditioning system, for example, Japanese Patent Application Laid-Open No. 57-196029
Techniques disclosed in publications such as No. This conventional technology requires the blower to increase the air flow based on this detection signal when the wind speed sensor detects that the flow rate is below the set amount while the throttle valve of any one control unit is fully open. It was designed to be given.

(Problems to be Solved by the Invention) In the prior art, since the overall air volume is changed based on the state of only one unit, ignoring the overall state, large fluctuations tend to occur in the air volume change. In other words, if any one VAV unit is fully open and the air volume of that VAV unit is insufficient, the air volume from the blower will be increased immediately, but all the dampers will soon become less than fully open. , even if the air volume is increased, the air volume must be immediately reduced, which causes fluctuations in the air volume.
) occurs. Such a undulating phenomenon is not only unfavorable for energy saving, but also causes other problems in terms of comfort.

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

(Means for Solving the Problems) The present invention includes a first signal generating means for generating a first signal representing a state when the damper is fully open, and a determining means for determining whether the air volume of the main duct is excessive or insufficient. In preparation, when the first signal is generated and the air volume of the main duct is insufficient, the air blowing capacity of the air conditioner is increased, and when the first signal is not generated and the air volume of the main duct is excessive, the air conditioner is increased. This is an air conditioning system that reduces the aircraft's air blowing capacity.

In an embodiment, the first signal is generated when the corresponding damper is fully open, or when the corresponding damper is fully open and being driven further in the opening direction.

(Function) When any damper is fully open and the overall air volume is insufficient, the air blowing capacity is increased, and when any damper is not fully open and the overall air volume is excessive, the air blowing capacity is reduced. In other words, even if any one damper reaches a fully open state, the air blowing capacity will not be increased unless the actual air volume of the main duct is smaller than the set air volume, and neither damper is fully open. The air blowing capacity is reduced only when the actual air volume of the main duct is larger than the set air volume.

(Effects of the Invention) According to the present invention, the air blowing capacity of an air conditioner can be increased (decreased) immediately, compared to the conventional technology that immediately increases or decreases the air blowing capacity based on the condition of the throttle valve of one VAV unit. In addition, fluctuations in the amount of air blown due to frequent control such as decreases (increases) are alleviated, and comfort can be further improved. At the same time, when all the dampers are not fully opened and the air volume is excessive, the air blowing capacity is reduced, so the energy saving effect is not impaired.

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.

The air conditioning system 10 has one central air conditioner 1
Contains 2. This invention is not limited to such a central method.
It should be pointed out in advance that it can also be applied to multi-level systems.

In the air conditioner 2, a centrifugal type or other appropriate type may be used as the blower 14, for example. The outlet of this blower 14 is connected to the main duct 16. From this main duct 16, branch ducts 20, 20, . ... are provided, and from these branch ducts) 20, 20°... each chamber 18, 18.・・・
・Air is supplied to.

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 2 to flow downstream of the post 22 due to the air flow generated in the branch duct 20.
4 occurs. In order to detect this Karman vortex 24, an ultrasonic transmitter 26 and a receiver 28 are provided so as to face each other across the branch duct 20 at that position. The ultrasonic transmitter 26 and the receiver 28 are connected to an airflow measuring device 30, which measures the airflow, for example, by detecting the phase of the ultrasonic signal. 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 signals transmitted from the ultrasonic transmitter 26 reach the ultrasonic receiver 28 with a time difference. . Therefore, the air volume measuring device 30 detects the period of change in the time difference from the timing when a transmission pulse is given to the ultrasonic transmitter to the timing when 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. Note that instead of detecting the phase in this manner, the air volume may be measured by detecting changes in the amplitude or frequency of the ultrasonic signal caused by the Karman vortex 24, or by detecting other types of air volume or wind speed. Of course, measuring means may also be used.

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 is provided with a temperature sensor 34, and the temperature sensor 34 sends a voltage signal of a magnitude according to the difference between the indoor temperature and the set temperature, that is, the magnitude of the temperature deviation, to the damper controller 3.
2 is an error. The voltage signal from this temperature sensor 34 is also given, for example, in the range of O to IOV. The damper controller 32 controls the opening degree of the damper 36 provided in each branch duct 20 using the damper driving motor circuit 38 according to these two voltage signals. For example, when the voltage signal from the airflow measuring device 30 is larger than the voltage signal from the temperature sensor 34, the damper controller 32
A signal is given to the damper drive motor circuit 3 to close 6. 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 mold pressure signals are the same, damper controller 32 and damper drive motor circuit 38 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 by rotating the shaft of this synchro motor (not shown) by, for example, 69 degrees, the damper 36 is rotated by, for example, 60''. As will be described later, the damper drive motor circuit 38 is provided in connection with the output shaft of the motor (not shown), and a relay is connected depending on the state of the corresponding damper. A relay control circuit and signal generation means are provided to control the
A signal from this circuit 38 is provided to a motor control circuit 40. The motor control circuit 40 controls, for example, a blower drive motor 42 in response to these applied signals 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 drives the fan of the blower 14 to rotate. The motor control circuit 40 further includes a large-mouth vane (not shown) of the blower l4 as a means for adjusting the air volume or air blowing capacity.
a motor 44 for driving the air conditioner 12, and a motor 46 for driving the scroll damper (not shown) of the air conditioner 12.
are connected. However, in this example,
The motor control circuit 40 mainly controls the rotational speed of the blower drive motor 42.

Next, referring to FIG. 2, the damper driving motor circuit 38 and the motor control circuit 40, which are characteristic in the embodiment of FIG.
I will explain about. Each damper drive motor circuit 38 includes a relay control circuit 48 that controls the corresponding damper controller 32 and damper 36 .
(and damper drive motor: not shown), three relays X1. Controls activation or deactivation of X2 and X3. That is, relay X1 is energized when the corresponding damper 36 (FIG. 1) is fully open, and is deenergized in other situations. Relay X2 is damper controller 3
2 is energized when the corresponding damper 36 is about to move in the opening direction. Relay X3 is energized when damper controller 32 attempts to operate the corresponding damper 36 in the closing direction.

Relay X1 includes one normally open contact Xla, and relay X2
includes two normally open contacts X2al and X2a2, and relay X3 further includes one normally open contact X3a. Relay X
One of the contacts Xla of No. 1 is connected to the cathode of the diode D1, and is also connected to one of the contacts X2al of the relay X2. The other contact point X2al is connected to the anode of the diode D2, and the anode of the diode D1 and the cathode of the diode D2 are commonly connected to the power supply line or signal line Y. The other contact Xla, one contact X2a2 of relay X2, and one contact X3a of relay X3 are commonly connected to power supply line or signal line X. Contact X
The other terminal of contact X3a is further connected to the cathode of diode D3 via resistor R1, and the other terminal of contact X3a is connected to the anode of diode D4 via resistor R2. Anode of diode D3 and diode D4
The cathode is commonly connected to the power supply line or signal line 2. Signal lines X, Y, and Z are each connected to a reception controller 50 included in the motor control circuit 40.

The reception controller 50 includes, for example, a C-MOS bidirectional switch, and switches the polarity of the voltages of the three signal lines X, Y, and 2. That is, the reception controller 50 alternately switches the voltage polarity between the signal lines X and Z in order to detect the A signal (acting as the first signal) and the D signal, and detects the B signal (acting as the second signal). The polarity of the voltage is alternately switched between the signal lines X and Y to detect the C signal (acting as a third signal) and the C signal (acting as a third signal). Such voltage polarity switching is performed for signal lines X, Y, and 2 synchronously. In other words, (-) on signal line
is given, both signal lines Y and Z are (+)
When (+) is applied to signal line X, (-) is applied to both signal lines Y and Z.

Such a reception controller 50 includes four signal receivers 52.
, 54, 56 and 58 are connected, and the corresponding D
signals, A signal, B signal and C signal. To this end, the D signal receiver 52 and the B signal receiver 56 are activated when the signal line It is activated when (+) is applied to the signal line X by the reception controller 50.

When (+) is applied to signal line X and (-) is applied to signal lines Y and 2, diodes DI and D3 are in the forward direction, and diodes D2 and D4 are in the reverse direction. When relay Xi is energized in this state, its contact Xla is turned on, and current flows through the path of signal line X, contact X1a, diode Dl, and signal line Y. At this time, even if relay X2 is energized, the path of contact
received by. Note that when relay X2 is energized, relay X3 is never energized.

When (+) is applied to signal line X and (-) is applied to each of signal lines Y and Z, when relay X2 is energized, its contacts X2al and X2a2 are turned on. Since the path of contact X2al is reversed by diode D2, signal line X - contact X2a2 - resistor R
Current flows only through the path 1-diode D3-signal line X. The fact that relay X2 is energized means that the corresponding damper is being driven in the opening direction, and the high-level signal input to reception controller 50 at this time is treated as B signal and sent to B signal receiver 56. received by.

In a state where (-) is applied to the signal line X and (+) is applied to each of the signal lines Y and Z, the diode D2
and D4 are in the forward direction, and diodes D1 and D3
is in the opposite direction. In this state, when relay X3 is energized, its contact X3a is turned on, and signal line X - contact X3
A current flows through the path a-resistance R2-diode D4-signal line Z, and a high-level signal is given to the reception controller 50.

When relay X3 is energized, relay X2 is not energized and contact X2al remains off;
Therefore, the signal at this time is received by the C signal receiver 58 as a C signal.

When the signal line X is set to (-) and the signal lines Y and Z are set to (+), the diodes D2 and D
Only 4 routes are enabled. In this state, relay
and X2 is energized, its contacts Xla and X2
al is turned on. Therefore, a current flows through the path of signal line Y -> diode D2 - contact X2a1 - contact X1a - signal line X, and a high level signal is given to reception controller 50 .

The fact that relay X1 is energized means that the corresponding damper is in the fully open state, and the fact that relay X2 is energized means that the corresponding damper is about to be opened further, that is, in the overload state. represent. Therefore, the high level signal obtained by the reception controller 50 at this time is received by the D signal receiver 52 as a D signal.

Note that this D signal is not used in the case of the operation shown in FIG. 4, but is used in the same way as the A signal only in the case of the operation shown in FIG.

In addition, in FIG. 2, one damper driving motor circuit 38
Although only the damper drive motor circuit 38 provided in the other VAV units is shown and explained in detail, the damper drive motor circuit 38 provided in the other VAV units is similarly configured.

Relay X of any one damper drive motor circuit 38
1 is energized, then the A signal is provided to the A signal receiver 54. If the relay X2 is further energized in this state, the D signal is received by the D signal receiver 52, and both of these signals A and D can be used as the first signal.

The B and C signals are connected to resistors R1 and R2, respectively.
The current flowing through determines its voltage level. Each damper drive motor circuit 38 has a signal line X,
Since they are connected in parallel to Y and Z, the currents from each circuit 38 flow into the reception controller 50 in a superimposed or additive manner. Therefore, if the resistance value of the resistor R1 and the resistance value of the resistor R2 are made equal, the voltage level received by the B signal receiver 56 and the voltage level received by the C signal receiver 58 can be compared. For example, the number of units whose dampers are about to move in the open direction and the number of units whose dampers are about to move in the close direction can be compared for the system as a whole. For that purpose,
A comparator 60 is provided. The comparator 60 compares the voltage level received by the B signal receiver 56 with the voltage level received by the C signal receiver, and outputs the number of dampers that are operating in the open direction as a whole. A signal "1" or rOJ indicating whether there are many dampers or whether there are many dampers operating in the closing direction is output.

The A signal (and D signal) received by the A signal receiver 54 (and D signal receiver 52) is provided as is to the floating control circuit 62 along with the output of the above-mentioned comparator 60. The floating control circuit 62 includes:
Although not shown, in each of the A signal receiver 54 and the comparator 60, if the D signal is used, two or three single units are further triggered by the high level "1" output of the C signal receiver 52. Contains a stable multivibrator.

The inverter 64 is then "floating controlled" in accordance with the combination of output states of the two or three monostable multivibrators, that is, the combination of logic. That is, if the respective outputs of the monostable multi-bi break triggered by the output from the A signal receiver 54 and the monostable multi-bi break triggered by the output of the comparator 60 are "1", the floating control circuit 62 The oscillation frequency of the inverter 64 is increased (Similarly, even if all the outputs, including the output of the monostable multivib break triggered by the output of the Rough C signal receiver 52, are at high level, the oscillation frequency of the inverter 64 is increased. The frequency can be increased.Also, when the outputs of all monostable multi-bi breaks are low level or "0",
Floating control circuit 62 reduces the oscillation frequency of inverter 64.

If the frequency of the inverter 68 is increased, the rotation speed of the blower drive motor 42 (Fig. 1) increases, and the blower 14
The amount of air sent out, that is, the air 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.

If the configuration is as shown in Figure 2, all ・V
The AV units can be connected in parallel, and the motor control circuit 40 and each VAV unit, that is, the damper drive motor circuit 38, need only be connected with three cables, making the configuration extremely simple. be.

FIG. 3 is a schematic block diagram showing a modification of the embodiment of FIG. 2. The embodiment of FIG. 3 differs from the embodiment of FIG. 2 in that the diodes D1 to D4 and the reception controller 50 are not used.

Alternatively, the four signal lines 38a, 38b, 38c and 38d from the damper drive motor circuit 38 are connected directly to a corresponding one of each signal receiver 54, 56, 58 and 52, and furthermore, e.g. A common line 39 to which a constant voltage is applied is used. That is, each relay contact
One end of each of la, X2a2, and X3a is connected to a common line 39, and the common line 39 is connected to a damper drive motor circuit 38.

When the relay X1 is energized and its contact Xla is closed, current flows through the signal line 38a and the A signal receiver 54 receives the A signal. When relay X2 and relay X1 are energized and their contacts Xla, X2al, and X2a2 are closed, current flows through signal line 38d, and C signal receiver 52 receives the D signal. In the same way, when only relay X2 is energized, current flows through signal line 38b and the B signal is received by B signal receiver 56, and when only relay X3 is energized, current flows through signal line 38c. The C signal may be received by the C signal receiver 58 .

In this embodiment of FIG. 3, it is not necessary to use a diode, but it is necessary to connect five cables.

Next, referring to FIG. 4, the operation of the embodiment shown in FIG. 1, ie, FIGS. 2 and 3 will be described. In this example, the D signal is not used for control.

First, each signal is taken in by each signal receiver 54, 56 and 58 of the motor control circuit 40.

Then, it is determined whether there is an A signal. Here, damper 36 of any one branch duct) 20 (Fig. 1)
is fully open, the A signal is being received by one of the A signal receivers 54 (FIG. 2). therefore,
A high level is output from a corresponding monostable multi-bi break (not shown) included in the floating control circuit 62. Then, if there is a signal, the number of B signals (voltage level) obtained from each of the B signal receiver 56 and the C signal receiver 58 is compared with the number of C signals (voltage level) by comparison @60. do. If the number of B signals is C
If the signal is greater than that of the signal, the comparator 60 outputs "1". In response, a corresponding monostable multivibrator (not shown) included in the floating control circuit 40 is triggered and outputs a high level. Floating control circuit 62 increases the oscillation frequency of inverter 68 in response to these two high-level signals. Therefore, the rotational speed of the blower drive motor 42 is increased, and the amount of air blown from the blower 14 is increased. That is, if any damper is fully open and the amount of air blown from the air conditioner 12 is insufficient overall, the amount of air blown is increased.

Even if there is an A signal, if the number of B signals is less than the number of C signals, the output state of the two monostable multivibrators of the floating control circuit 62 will be "10", and the frequency of the inverter 64 will not be changed. Therefore, in this case, the air blowing capacity of the air blower 14 is maintained as it is.

If none of the dampers is fully open, therefore there is no A signal, and the number of B signals is less than the number of C signals, the logic state of the monostable multi-bi break of the floating control circuit 62 becomes "00.1". The floating control circuit 62 reduces the oscillation frequency of the inverter 68 in response to these two low-level signals.Therefore, the rotation speed of the blower drive motor 42 is reduced, and the amount of air blown from the blower 14 is reduced. In this way, if all the dampers are not fully open and the amount of air blown from the air conditioner 12 is too large as a whole, the air blowing capacity is reduced.

Even if there is no A signal, if the number of B signals is greater than the number of C signals, the output state of the two monostable multivibrators of the floating control circuit 62 becomes "ol", and the frequency of the inverter 64 is not changed. Therefore, in this case, the air blowing capacity of the air blower 14 is maintained as it is.

Next, another example of the operation of this embodiment will be explained with reference to FIG. In the example shown in FIG. 5, the D signal from the D signal receiver 52 is also utilized. I First, take in the signal and determine whether there is a D signal.

If there is a D signal, it means that one of the dampers is fully open and the air volume of that branch duct is less than the set air volume. Therefore, in this case, the B signal and the C signal are compared in the same way as when it is determined Yes in "A signal present?" in FIG. If the number of B signals is greater than the number of C signals, the air blowing capacity will be increased.

If there is no D signal, then it is determined whether or not there is an A signal, and if there is no A signal, the numbers of B and C signals are compared. If the number of B signals is small, the blowing capacity is reduced, and if there is no D signal and only the A signal, the blowing capacity is maintained as it is.

In other cases, the air blowing ability is maintained as in the case of FIG. 4.

In addition, in the above-mentioned Example, the case where this invention was implemented in the system which controls a damper opening degree according to an air volume or an air speed was demonstrated. However, when operating as shown in FIG. 4, the present invention can be effectively applied to a system using a VAV unit without an airflow measuring device as shown in FIG. 6. In FIG. 6, parts that are the same or similar to those in FIG. 1 are given the same reference numerals, and redundant explanation thereof will be omitted.

In this FIG. 6 embodiment, the damper controller 32 responds only to the temperature deviation voltage from the temperature sensor 34 of each room to control the damper 3.
Control 6. Therefore, this embodiment of FIG.
Although the accuracy is somewhat lacking in that the inlet static pressure of the branch duct is not reflected when the damper 36 is opened and closed compared to the illustrated embodiment, the purpose of the present invention to control the amount of air blown from the air conditioner 12 is sufficiently achieved. It can be done.

Note that the circuit shown in FIG. 2 can be used as the damper driving motor circuit 38 and the motor control circuit 40 in the embodiment shown in FIG. Further, in this embodiment, a scroll damper, an inlet vane, and related circuits are not provided.

In the above embodiment, in order to determine whether the actual air volume of the main duct, that is, the actual air volume of the entire system, is larger than the set air volume, the number of dampers in the opening direction (the number of B signals) and the number of dampers in the closing direction are determined. (number of C signals). However, this means that each branch duct (VAV unit)
Measurement results of the airflow measuring device and temperature sensor 3 installed in
The required air volume information from No. 4 may be used to make the determination based on the sum of the information. In this case, for example, the motor control circuit 40 may be provided with means for calculating such a sum. Furthermore, it would be easy to consider providing a means for measuring the air volume or wind speed in the main duct and making a determination using the measurement results of the main duct air volume measuring means.

[Brief explanation of the drawing]

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. FIG. 3 is a schematic block diagram showing a modification of the embodiment of FIG. 2. FIGS. 4 and 5 are flowcharts for explaining the operation of this embodiment, respectively. FIG. 6 is an overall configuration diagram showing another embodiment of the present invention. 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 meter, 32 is a damper controller, 36 is a damper, and 38 is a damper drive 40 is a motor control circuit, 42 is a blower drive motor, 50 is a reception controller, 52 is a D signal receiver, 54 is an A signal receiver, and 56 is a B signal receiver.
signal receiver, 58 is a C signal receiver, 60 is a comparator, 62
indicates a floating control circuit, and 64 indicates an inverter. Patent applicant Kubota Iron Works Co., Ltd. (one idiot) agent
Patent Attorney Oka 1) Zen Kei (1 idiot) Figure 4 Figure 5

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, a first signal generating means for generating a first signal representing a state when the damper is fully open; a determining means for determining whether the amount of air blown from the main duct is excessive or insufficient; When the determining means determines that the air volume of the main duct is insufficient, the air blowing capacity of the air conditioner is increased, and the first signal is not generated and the determining means determines that the air volume of the main duct is excessive. An air conditioning system comprising an air blowing capacity control means for reducing the air blowing capacity of the air conditioner when the air conditioner is turned off. 2. The air conditioning system according to claim 1, wherein the first signal generating means includes means for generating the first signal when the corresponding damper is fully open. 3. The air conditioning system according to claim 1, wherein the first signal generating means includes means for generating the first signal when the corresponding damper is fully open and driven in the opening direction. 4. A second signal generating means that generates a second signal when the corresponding damper is driven in the opening direction, and a third signal generating means that generates a third signal when the corresponding damper is driven in the closing direction. Claims 1 to 3 include means for determining the number of second signals and the number of third signals.
Air conditioning system as described in any of paragraphs. 5. The air conditioner according to any one of claims 1 to 3, which includes branch duct air volume measuring means provided in association with each branch duct and for measuring the air volume or air volume of the corresponding duct. system. 6. The air conditioning system according to claim 5, wherein the determining means includes means for calculating the actual air volume of the main duct based on the measurements of the branch duct air volume measuring means. 7. Main duct air volume measuring means is provided in relation to the main duct and for measuring the air volume or wind speed of the main duct, and the determining means makes the determination based on the measurement by the main duct air volume measuring means. An air conditioning system according to any one of claims 1 to 3.