JPS62194159A - Duct type air-conditioning machine - Google Patents

Abstract

PURPOSE:To permit to employ VAV system, high in energy saving property and comfortable property, by a method wherein the air distributing ends of respective room ducts of the air-conditioning machine of a central concentrated air-conditioning system is provided with variable air volume (VAV) controllers. CONSTITUTION:The indoor controller 101 of the titled duct type air-conditioning machine effects central concentrated air conditioning. The indoor controller 101 reads an information from a VAV controller 104, capable of being mounted later, to effect the VAV control of respective rooms. For this purpose, the indoor controller 101 and the VAV controller 104 are provided with serial transmitting circuits 101A, 104A while these are connected through a transmission passageway 106 consisting a pair of wires. The VAV controller 104 outputs control signals to damper motors 9A, 9A... in accordance with an air pressure and an indoor temperature to control the opening degrees of respective dampers 9, 9,.... Programs, necessary of the VAV control, are accommodated previously in the indoor controller 101 and when a building is extended in its size, the VAV controller 1A1 and a room sensor 1A6 are added whereby the comfortable and energy saving air conditioning may be effected in respective rooms by the VAV system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a duct two air conditioner that employs a variable air volume control system that can independently adjust the room temperature of each room.

[Conventional technology]

Central air conditioning systems use air ducts to distribute temperature-controlled air to each room for air conditioning, and can easily incorporate humidifiers and high-performance filters, as well as external air processing and total heat exchangers. It is possible to achieve high-quality air conditioning, and since the air-conditioned room only has an outlet and an inlet, indoor space can be used effectively, and there are fewer problems with the heat transfer system. It has many advantages compared to distributed package air conditioners, and for this reason is often used for air conditioning in buildings. Among them, the variable air volume control method (hereinafter referred to as VAV method), which enables energy-saving operation, can independently control the temperature of each room with a different heat load, and can also stop air conditioning in rooms that are not in use. Operating costs can be reduced by varying the power of the blower depending on the amount of air required, and the capacity of the heat source device can be designed to be smaller by considering the simultaneous usage rate.

There are several VAV methods.

One method is to use an aperture-type VAV unit. This method detects the pressure inside the duct, which changes according to the opening degree of the damper, and controls the capacity of the blower so that this value becomes the set value. The required capacity of the heat source equipment is reduced, and at the same time the power of the blower is reduced (hereinafter referred to as VAV control or VAV method. Kosho 6
0-47497 and Figure 2.10 (a) of the Refrigeration and Air Conditioning Handbook (New Edition, 4th Edition, Applied Edition) published by the Japan Refrigeration Association are known.

FIG. 10 is a system configuration diagram of these conventional air conditioners. In the figure, l indicates a room to be air-conditioned, and here a case of four rooms is shown.

2 is an indoor unit placed in the ceiling of room 1, and air filter 3. Heat exchanger4. It is composed of a blower 5.

6 is a main duct connected to the air outlet of the indoor unit 2, 7 is four branch ducts branched from this main duct 6 according to the number of rooms, and 8 is a throttle inserted in the middle of each branch duct 7. 9 is a damper rotatably installed in the VAV unit 8, 10 is an air outlet installed at the end of the duct 7, and 11 is a suction port provided at the bottom of the door of the room 1. , 12 is a ceiling suction port provided on the ceiling surface of the hallway, and 13 is a connection between this ceiling suction port 12 and the indoor unit 2.
14 is a room controller installed in each room 1 and has a built-in indoor detector (not shown); 15 is a temperature detector installed in the main duct 6; 16 17 is a heat source device such as a heat pump connected to the heat exchanger 4; 18 is a control device 19 for controlling the operation of this heat source device, the blower 5, and the damper 9; is the main controller, which serves as an operation panel for switching between cooling, heating, shutting down, etc., and setting programs for room temperature.

In the conventional air conditioner configured as described above, the opening degree of the damper 9 can be set to an arbitrary position according to the temperature difference between the facility temperature set by each room controller 14 and the detected current air temperature. Adjust each.

Then, the H force inside the main duct 6 changes according to the opening degree of the damper 9, which is detected by the pressure detector 16, and the capacity of the blower 5 is changed so as to reach the set pressure. Also,
Since the outlet air temperature of the heat exchanger 4 changes as the air flow rate changes, this temperature is detected by the air temperature detector 15 and the capacity of the heat source device 17 is adjusted to reach a preset air temperature. Control. The air thus adjusted to a substantially constant temperature is blown out into the room 1 from the water outlet 10 at an air volume depending on the magnitude of the indoor heat load. The air that has been conditioned in the room 1 flows from the suction port 11 through the corridor ring space to the ceiling suction port 12, and then into the suction duct 1.
3 and returns to the indoor unit 2 again.

These series of controls are controlled by the main controller 19 and the room controller 14. Temperature detector 15. Based on detection signals from the pressure detector 16 and various detectors (not shown) in the heat source device 17, the control device 18 performs optimal control to satisfy energy saving and comfort.

Here, to further explain these conventional control devices using FIG. 11, the control device 18 has a built-in microcomputer, for example, and expands its input/output with an I/Q driver etc. 14. A power supply and a plurality of signal transmission lines are connected to the room controller 14 from a control device 18 . Since there are, for example, four rooms, each room requires four signal transmission lines and two power supply lines, a total of 6 wires, so 6 wires x 4 rooms = 24 wires, which requires work to be distributed and wired to each room.

Such conventional duct-type air conditioners cannot handle cases where the number of zoning rooms is to be increased due to, for example, expansion or renovation of a residence or a change in the layout within the residence. This is because the microcomputer in the control device 18
/Q driver expansion etc. is limited by the hardware circuit.
Extra room controller in advance 14. damper 9
It can be said that it is wasteful in terms of cost to design a system so that users can add it later. Also, this VAV method requires less room controller 14. It is obvious that the system cost and construction cost will increase as the damper 9 is required.

In the conventional VAV method described so far, the opening degree of the damper 9 is controlled based on the signal from the room controller 14,
Each room temperature is accurately controlled, and operating costs are reduced by closing the damper 9 of the room 1 where no one is present and air conditioning only the necessary room 1. However, when entering a room 1 that is not air-conditioned, it is necessary to start air-conditioning in that room M1 using the room controller 14 or the like, and it takes time to reach the set room temperature after starting the air-conditioning.
Compared to conventional duct-type air conditioners that air-condition all rooms simultaneously, they were less cumbersome to operate and less comfortable until the room temperature reached the set value. Furthermore, when VAV type air conditioners are sold for residential use, they are not necessarily accepted by a wide range of buyers, depending on the income and energy conservation consciousness of the purchasers. Furthermore, V.A.V.
The method is VA■ The equipment costs and construction costs for unit 8 and room controller 14 are higher than conventional duct type air conditioners that air condition all rooms simultaneously, so it is not suitable for low-income people despite the low operating costs. It was difficult to purchase.

For example, middle-income earners feel burdened by the operating costs of simultaneously air-conditioning all rooms and would like to save energy by using the VAV system, but some complain that the initial installation purchase cost of the VAV system is too high and they are unable to take the plunge.

This invention solves the above-mentioned conventional problems, and is based on an air conditioner that performs central air conditioning.
It is possible to change to AV control at low cost, and even though the air conditioner is a central air conditioning system, the user can purchase an optional VAV control means at a later date, allowing the VAV method to be highly energy-saving and comfortable. The purpose is to make it possible to adopt it.

[Means for solving problems]

The duct type air conditioner according to the present invention is an indoor control device that simultaneously controls the air conditioning of each room based on intake air temperature information, and can be added as an option after installation of the indoor control device and can be added to each room. A room controller that sets and detects the temperature of the indoor controller, which is connected later as an option to the indoor control device, and transmits temperature information, room information, and blowing pressure information from the room controller to the indoor control device, and also transmits the temperature information and room information to the indoor control device. This system is equipped with a variable air volume (VAV) control device that adjusts the opening degree of a damper provided at the duct air distribution destination of each room.

[For production]

In this invention, the room controller and variable air volume control device for each room are added as options to the central air conditioning system that has been purchased and installed in advance.
V method), and information regarding the room temperature and set temperature of each room of each room controller and information on the room to be subjected to VAV control are transmitted to the variable air volume control device. In addition, the variable air volume control device individually controls the damper opening degree of each room based on the information from each room controller, and also uses the load information of each room and the static pressure information in the duct obtained based on the above information. It is then transmitted to the indoor control device. This enables variable air volume control for each room individually depending on the set temperature, and when there is no variable air volume control signal, the room controller selects intake air temperature detection and switches to simultaneous batch air conditioning. Enables batch air conditioning and VAV control.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a system configuration diagram of the main parts of a duct type air conditioner according to the present invention. In the figure, a heat source unit 17 installed outdoors (in this embodiment, it is an inverter type compressor capable of capacity control, hereinafter referred to as an outdoor unit) is connected to an indoor heat exchanger 4 through a refrigerant pipe 4a. outdoor heat exchanger 17A.

It includes a compressor 17B and a blower 17G, and constitutes a refrigerant cycle for air conditioning. The indoor control device 101 includes an air temperature sensor 105 provided near the intake port 12 of the air conditioning circulation system, and an indoor unit operating section 1 that controls the room temperature setting.
02 (corresponding to the main control 19 in Figure 1O) are input, and the indoor control device 101 outputs an intake air temperature display signal to the air temperature display 103. Indoor fan motor 5
The wind speed control command is now given to A. As a result, the indoor control device 101 has a function of performing omnipotent simultaneous batch air conditioning (hereinafter referred to as central batch air conditioning) based on intake air temperature data and input data from the indoor operation unit 102.

Further, the indoor control device 101 has a function of automatically capturing information necessary for VAV control from a VAV control device 104 that can be additionally installed or installed later as an option, and performs zoning of each room, that is, VAV control. It is equipped with

For this purpose, the indoor control device 101 and the VAV control device 1
04 each has serial transmission circuits 101A and 104A that exchange information for VAV control, and these are connected by a transmission line 106 of a frequency multiplexed DC power transmission system, for example, a pair of two lines. The serial transmission circuit 101A of the indoor control device 101 is connected to the outdoor unit 1.
The serial transmission circuit 104A of the VAV control device 104 is connected to the serial transmission circuit 17D using a similar frequency multiplexed DC power transmission method provided in the VAV control device 104 through a two-line transmission line 106.
．． Each serial transmission circuit 14 provided in 14...
A, 14A, . . . are connected via a transmission line 106, and temperature information of each room can also be transmitted.

The VAV control device 104 also includes a position sensor 9B that detects a detection signal from a pressure sensor 16 for measuring static pressure installed in the discharge air duct 6 and a starting position rotation angle of each damper 9. , 9B.

The position signals of the dampers 9, 9, . . . , . A control signal is output to the damper motors 9A, 9A, .

FIG. 2 shows a specific example of the internal circuits of the indoor control device 101, the VAV control device 104, and the outdoor unit 17 that enable the transmission of information necessary for the above-mentioned VAV control.

In the figure, the outdoor unit 17 is connected to an AC power source 30 via a transformer 31, and includes an AC-DC converter 20A that converts the AC into DC, a smoothing circuit 20B that smoothes the DC output, and a DC output. an inverter 20C that converts the current into three-phase AC of an arbitrary frequency, and a three-phase AC motor 17B for a compressor driven by the AC output of this inverter 20G.
1, and a signal generating section 20D that converts transmission information from the serial transmission circuit 17D into an analog signal and generates a PWM (pulse width modulation) signal for controlling conduction of an inverter 20C consisting of a power transistor. There is.

Further, the indoor control device 101 includes a microprocessor (MPU) 201, and the microprocessor 20
1 is connected to an indoor unit operation section 102 and an air temperature display 103, as well as an A/D conversion section 202 that converts the detection signal of the intake air temperature sensor 105 into a digital quantity, and further connected to a microprocessor. 201 is a driver 20 that outputs an output signal calculated according to the intake air temperature.
3, the drive motor 5 is operated and the drive motor 5 is controlled to a speed according to the intake air temperature by controlling the phase of the control element 204 such as a triac connected to the power supply circuit of the drive motor 5A of the blower 5. The air volume of the blower 5 is controlled. The air volume control program at this time is stored in a memory (ROM) 205 connected to the microprocessor 201. The memory 205 also stores a processing program for determining whether the microprocessor 201 is performing central air conditioning or whether information necessary for VAV control is being transmitted from the VAV control device 104 through the serial transmission circuit 101A. .

On the other hand, the VAV control device 104 includes a microprocessor (
MPU) 210, this microprocessor 210
includes a memory (ROM) 211 and an A/D converter 212 that converts the detection signal of the pressure sensor 16 into a digital quantity.
．． An input/output circuit (T10) 213 and a serial transmission circuit 104 that send control signals to the damper motors 9A, 9A, and input signals from the position sensors 9B, 9B, and so on.
A is connected. The memory 211 stores a control program for zoning in which each room is individually air-conditioned via a duct. Also, in Figure 2, 3
13 is a power supply circuit for each tamper motor 9A, and AC power supply 3
0 and a rectifier circuit 313B connected to the secondary side of the transformer 313A.

FIG. 3 shows serial transmission circuits 104A and 14 for communication between the VAV control device 104 and the room controller 14.
A specific example of A is shown below.

The serial transmission circuit 104A of the VAV control device 104 is
A rectifier 302 that generates a 12V DC voltage is connected to an AC power supply 30 via a voltage dividing transformer 301.
The DC output end of this rectifier 302 is connected to the transmission line 106 through a C smoothing circuit. 303 is a rectifier 30
microprocessor 21 connected to the DC output terminal of 2;
3-terminal regulator for obtaining DC power of 0 grade, 30
4 is a tone decoder connected to the power line of the rectifier 302 via a coupling capacitor C1, and has a DC 12V
The high-frequency carrier signal superimposed on the signal is detected, only the necessary information signals are identified, converted into serial pulse wave signals, and manually sent to the microprocessor 210. This becomes the receiving system in the serial transmission circuit 104A.

The transmission system is operated by an AND gate 306 which takes the transmission pulse signal from the microprocessor 210 as one input and the carrier signal from the carrier oscillator 305 as the other input and mixes the two, and the output of this AND gate 306. The pulse coupling transformer 308 has a primary side connected to the collector of the transistor 307, and a pulse coupling transformer 308 whose secondary side is connected to the power supply line of the rectifier 302 via a coupling capacitor C2. Note that 214 is a drive circuit for driving and controlling the damper motor 9A.

On the other hand, the room controller 14 has a diode bridge circuit 310 connected to the transmission line 106, which constitutes a 12V DC power supply for the room controller 14, and also directs a high frequency carrier signal superimposed on the 12V DC in a specific direction. A tone decoder 311, which constitutes a reception system, is connected to the output line of the diode bridge circuit 310 via a coupling capacitor C3. The tone decoder 311 has DC 1
It detects the high frequency carrier signal superimposed on 2V, decodes only the necessary information signal, and converts it into a serial pulse wave signal.This pulse wave signal is processed by the microprocessor 4.
01 is input. Furthermore, the transmission system of the room controller 14 includes an AND gate 313 that receives a pulse signal sent from the microprocessor 401 as one input, receives a carrier signal from a carrier oscillator 312 as the other input, and mixes the two.
A pulse coupling transformer 315 whose primary side is connected to the collector of this transistor 314 and whose secondary side is connected to the output line of the diode bridge circuit 310 via a coupling capacitor C4. It consists of Reference numeral 316 is a three-terminal regulator connected to the output end of the diode bridge circuit 310 via a C smoothing circuit for obtaining DC power for the λ microprocessor 401 and the like.

The microprocessor 401 also includes an A/D converter 403 that converts the air temperature in the air-conditioned room and the temperature detected by the thermistor 402 into digital quantities, a display 404 that displays the room temperature, and operations for setting the room temperature. 405 are connected to each other, and a memory (ROM) storing a processing program is also connected.

Note that the serial transmission circuits of the indoor control device 101 and the outdoor unit 17 have the same configuration as the transmission circuit of the room controller 14.

In FIG. 4, (a) shows an example of the format of a serial transmission signal, in which a star bit ST and a self-address history S A for identifying a group of room controllers 14 are shown.
D I, S A D z and destination address bit P
It is composed of AD+, PADz, and data pins 1-DT, ~DT, which form information for VAV. In addition, the same figure (b) shows the indoor control device 101, the outdoor unit 17 and the V
It shows an example of a communication method between AV control devices 104.

Next, the operation of this embodiment configured as described above will be explained with reference to the flowcharts of FIGS. 5 to 7.

First, the operation of the indoor control device 101 will be explained according to the processing procedure shown in the flowchart of FIG.

When the program starts by initializing the indoor control device 101, it is determined in step 500 whether or not the air conditioner is powered on.

When it is determined that the power is on, in the next step 501, a power-on display is performed, and the indoor unit 2 and the outdoor unit 17 are controlled to select a mode such as cooling or heating according to an operation command from the indoor unit operation section 102, and to perform a mode selection process for the mode such as cooling or heating. Starts the air conditioner according to the selection. After that, the process moves to step 502, where zoning reception processing is executed, and the outdoor unit 17 and V
AV control B device! 104 to enable communication.

That is, first, the optional VAV control device 104
As shown in FIG. 1, it is determined whether or not the air conditioner is attached to the air conditioner. FIG. 4(b) shows an example in which this determination is carried out using the polling method, in which the destination address bits PAD+, PADz of the transmission signal packet SP
Set a code specifying the VAV control device 104 to
Transmission data SPI including this discrimination information is sent out through the serial transmission circuit 101A and the transmission path. Here ■ AV
If the ild control device 104 is not installed, there is no answer back from the VAV control device 104 regarding the transmission data SPI even after a certain period of time has elapsed, so it will be determined that zoning has not been selected (Step 503), and the central air conditioning Go to flow. Steps 504-507
shows the processing procedure for central air conditioning.

In the indoor control device 101, as shown in step 504, the intake air temperature information detected by the air temperature sensor 105 is sent to the A/
The temperature is input to the microprocessor 201 through the D converter 202, and in the next step 505, the difference ΔT between the temperature set value M set on the operation unit 102 and the detected temperature is calculated. In the next step 506, the speed F of the blower 5 is set by calculating F, =F (to ΔT) based on the temperature difference ΔTM. Also, in the next step 507,
The capacity of the compressor 17B, that is, the frequency F of the inverter output supplied to the compressor driving electric motor 17B1 is set by calculating -F(ΔT) on FC=.

The speed data F calculated in step 506 above.

is from the microprocessor 201 to the output driver 203
By controlling the conduction angle of the control element 204, the air volume of the blower 5 is controlled according to the temperature difference between the intake air temperature and the set temperature. Further, the set frequency data for controlling the capacity of the compressor set in step 507 is transmitted to the outdoor unit 17 in step 514.

That is, the indoor control device 101 sets a code specifying the outdoor unit 17 in the destination address bit of the transmission signal packet, and transmits the transmission data SP2 shown in FIG. 4(b) to the outdoor unit 17 through the serial transmission circuit 101A and the transmission line. Send to. In the outdoor unit 17, the serial transmission circuit 17D receives the transmission data SP2, and when it is determined that it is its own data, the serial transmission circuit 17D transmits the data SP3 including answerback and other information as shown in FIG. b)
It is transmitted to the indoor control device 101 as shown in FIG. Then, by decoding the frequency data FC sent in the data bits in the transmission data SP2 and adding it to the signal generation circuit 20D, and applying the PWM signal generated from this generation circuit 20D to each transistor of the inverter 20C,
The AC output frequency supplied from the inverter 20C to the motor 17B1 is controlled to control the capacity of the compressor 17B to be suitable for batch air conditioning.

On the other hand, if the VAV control device 104 is installed and the transmission system is connected, transmission data SP4 including the identification code of the VAV control device 104 is transmitted from the indoor control device 101 as shown in FIG. This is the V
When the serial transmission circuit 104A of the AV control device 104 receives the data and determines that the data is sent to itself,
The serial transmission circuit 104A transmits transmission data SP5 including an answer bank and other information (VAV control information) shown in FIG.

That is, when it is determined in step 503 that zoning is selected and communication between the two is possible, step 50
8, the number of rooms data R from the VAV control device 104
, , is executed.

The received data at this time is not just information on the number of rooms;
Information on the size of each room and its load status (south facing, kitchen, etc.) is also included. Note that the load status information is set using the operation unit 405 (bit switch) of the room controller 14.

When the reception process of the number of rooms data R7 is completed, the next step
Moving to the knob 509, processing is performed to receive static pressure data P (detection signal of the pressure sensor 16) from the VAV control device 104. Then, in the next step 510, based on the received data RLl,P, F,=F(P, )+
F (R,,) is calculated to calculate the rotational speed F1 of the blower 5, which is related to the amount of air blown by the blower 5, out of the amount of heat load to be sent to the main duct 6. The rotational speed data obtained by this calculation is applied to the driver 203 and converted into a phase control signal for the control element 204. By firing the gate of the control element 204 with this control signal, the power source 30 is transmitted to the blower motor 5. The rotational speed of the electric motor 5A is changed by controlling the voltage supplied to step 8, and the amount of air blown by the blower 5 is controlled according to the calculated value (F, ) (step 511). In this case, from the viewpoint of energy-saving capacity control, it is optimal to use a DC motor or an inverter-controlled motor.

Next, in step 512, the average value ΔtX of the temperature difference in each room is received from the VAV control device 104. When this reception process is completed, the process proceeds to step 514, where the average value Δt
The overall heat load is calculated from X, and the capacity control value (Fc) of the outdoor unit heat source is set. That is, by calculating F, =F (Δtx), the electric motor 17 of the outdoor compressor 17B
Inverter 20C output frequency value F supplied to B1. Set.

Then, in the next step 514, the serial transmission circuit 101A of the indoor control device 101 establishes communication between each serial transmission circuit 17D of the outdoor unit 17, and transmits the command setting data of F above to the outdoor unit 17.

In the outdoor unit 17, after the received command setting data of F is decoded by a microprocessor (not shown) in the serial transmission circuit 17D, it is added to the signal generation circuit 20D, and the generated PWM signal is sent to each transistor of the inverter 20C. By adding the electric motor from the inverter 20C,
The capacity of the compressor 17B is controlled by controlling the AC output frequency supplied to the compressor 17B1.

In addition, in the above embodiment, the capacity control value FC of the outdoor unit heat source is
Although the case has been described in which the frequency command value is used for an inverter type compressor, this may also be a gas furnace near burner capacity control value during heating.

Next, the operation of the VAV control device 104 will be explained based on the flowchart shown in FIG.

FIG. 6 shows a control procedure for zoning, that is, data transmission to the indoor control device 101 for VAV control and zoning for individual duct air conditioning of each room. When the VAV control device 104 is initialized and the program starts, in step 600, the VAV control device 104 is initialized and the program starts.
Communication for transmission from the AV control device 104 to the indoor control device 101 is established by the polling method shown in FIG. 4 (bl) described above.

Note that the indoor control device 101 has a VAV for zoning.
Establishment of a data link indicating that the control device 104 is selected and connected is done by transmitting the VAV control device's own address data assigned to the self address bit of the serial signal string in FIG. 4(a). .

Then, after zoning transmission is established, step 6
At step 01, it is determined whether there is a room that is turned on. In other words, it is possible to determine which room among the four rooms the signal comes from the room controller 14 and which room is selected for air conditioning request.
For example, this determination is made by polling between the VAV control device 104 and each room controller 14 using the destination address bit of the serial signal data shown in FIG. 4(a).

Then, in step 60, the number of selected rooms is detected based on the information transmitted from each room controller 14.
2), then in step 603, the detected number of rooms data R
7 is sent to the indoor control device 101. Thereafter, in step 604, the microprocessor 210 processes the wind pressure inside the duct 6 detected by the pressure sensor 16 to calculate static pressure data Ps, which is then transferred to the serial transmission circuit 1.
It is transmitted to the indoor control device 101 through 04A and 10IA. In the next step 605, the difference Δt8 between the set temperature of each room and the indoor air temperature transmitted from each room controller 14 is received.

Then, in the next step 606, the temperature difference Δ1X in each room is
The integrated average value Δt is calculated. After this Δ1X data is converted into a serial signal train as shown in FIG. 4 Ta), it is transmitted to the indoor control device 101 through the transmission circuit (step 607).

Step 608 is the difference Δt between the set temperature of each room and the room temperature.
From X, its calculation formula Dxo”F (Δt8).

Or specify the opening degree I of the damper 9 by referring to the table.
) is a processing program that determines xo. In the next step 609, the number of step pulses is calculated based on the determined opening data 1) The angle of the damper 9 is adjusted to control the scenery supplied into the room from the duct outlet 10. When the process of step 609 is completed, the process returns to step 600, and the following steps shown in FIG. 6 are sequentially executed.

FIG. 7 is a flowchart showing the processing procedure of the room controller 14.

When the program starts by initializing the room controller 14, in step 700 it is determined whether a room to be air-conditioned has been selected, and it is determined whether or not there is an on signal. A process of transmitting an off signal to the VAV control device 104 is executed.

When rYEsJ, the process advances to step 702 and sends an on signal indicating that the room should be air-conditioned to VAV.
It is transmitted to the control device 104. Then step 703
In step 704, the room temperature setting value set on the operation unit 405 is imported into the microprocessor 401, and in the next step 704, the current indoor air temperature detected by the sensor 402 is digitally converted by the A/D converter 403. and input it into the microprocessor 401. Then, in the next step 705, room temperature display processing is performed, and the processing results are displayed on the display 404. Thereafter, in step 706, the difference Δ1X between the room temperature and the set value is calculated, and in the next step 708, the calculated difference data ΔtX is passed through the serial transmission circuit 14A and the transmission line 106 to the VAV control device 104.
Send to.

Thereafter, by repeating the above operations, the ON signal and the difference data ΔtX are transmitted to the VAV control device 104.

The functions of this embodiment described above can be summarized as follows.

That is, information from the room controller 14 of each room necessary for zoning VAV control, and basic data for ensuring the air volume corresponding to the change in static pressure in the main duct 6 depending on the opening degree of the damper 9 in each room. Pressure sensor I
There is an independent VAV control device 104 that inputs and processes the static pressure data of No. 6, and this VAV control device 10
4 determines the damper 9 of each room based on the above information.

(-, the VAV control device 104
04A, the microprocessor 210 in the VAV control device 104 collectively transmits the above information to the indoor control device 101. That is, the indoor control device 101 is
Normally, central air conditioning is performed, but a data link with the VAV control device 104 is automatically established, and the VA
When it is determined that the V control device 104 is connected, the V
Based on the information transmitted from the AV control device 104, the rotational speed of the indoor blower 5 and the rotational speed of the outdoor compressor 17B are controlled.

In addition, the indoor control device 101. The transmission path 106 between the VAV control device 104 and the room controller 14 of each room is
The data link is shared between the indoor control device 101 and the VAV control device 104, and between the VAV control device 104 and each room controller 14 using a polling communication method. To freely combine collective air conditioning and zoning control, and to adapt these controls to an increase or decrease in the number of rooms.

Therefore, in this embodiment as described above, the following effects can be obtained.

(a) The user can purchase and install a central air conditioning system with a low initial cost and later change to a low-cost VAV system with high energy efficiency and comfort.

(b) The cost burden on the central air-conditioning system side is only the addition of the minimum ratio of software required for VAV control, and therefore an air-conditioning system that meets market principles can be provided.

(C) When installing the VAV control device, it is only necessary to wire a communication transmission line consisting of two wires, so the construction work is simple and costs can be reduced when changing the VAV system.

(d) Zoning after purchasing and installing a central air conditioning system Even if the number of air-conditioned rooms increases, it will be very easy to deal with it. That is, it is possible to increase the number of rooms that can be controlled by VAV simply by allowing a margin in the allocated addresses for determination in advance and providing a spare damper motor wiring.

(The transmission of room number data and control data during elVAV control operation is programmed from the room controller 14 to the VAV control device W104, then to the indoor control device, and then to the outdoor unit 17, as shown in FIGS. 5 to 7. Through processing,
Since processing is performed separately for each control portion, the reliability of the operation control operation of the air conditioner can be improved.

FIG. 8 shows an example in which commercial power wiring in a general household is used as the transmission line 106, and the drawing shows the connection relationship between the room controller 14 and the power wiring. That is, in this embodiment, the serial transmission circuit 14A of the room controller 14 is connected to the commercial power wiring 9 via the compres- ing transformer 901 and the DC cut capacitor 902.
It is connected to 03. Therefore, in this embodiment, there is no need to separately provide a transmission path as in the above embodiments, and the room controller can be easily installed.

FIG. 9 shows a further example of the present invention, which is a further development of the idea shown in the embodiment of FIG. 8 above. In the figure, a plurality of new VAVs are connected to the common transmission path 106.
Controller IAI is connected. Each VAV system control device IAI has a serial transmission circuit IA2, and this serial transmission circuit 1Δ2 shares the transmission of VAV information through the transmission path 106. Further, the microprocessor IA3 connected to the serial transmission circuit IA2 has a program memory IA4 for VAV control.

An A/D converter IA5 is connected to the microprocessor IA3, and the input terminal of the A/D converter IA5 is connected to a room temperature control circuit consisting of a series circuit of a thermistor IA6a that detects the air temperature in each room and a room temperature setting volume IA6b. Sensor IA
It is connected to ground via 6, and is also connected to power supply element 2 via fixed resistor IA7. This results in
By detecting the difference Δt8 between the room temperature and the set value and outputting this to the output sofa IA8, the damper motor 9A
The opening degree of the damper 9 is adjusted by performing a stepping operation.

At this time, the opening position of the damper 9 is detected by the position sensor 9B and fed back to the microprocessor IA3.

Therefore, with this method, the room sensor IA6 can be installed in the room instead of the room controller 14 by installing it near the VAV control device IAI and the damper 9 in each room. In this case, the calculation of the integrated average value of ΔtX from the VAV control device IAI of each room is performed by the indoor control device 101, and in conjunction with other information, the capacity of the indoor blower 5 or the heat source device of the outdoor unit 17 is controlled. You can do it like this.

In addition, if a program necessary for VAV control is stored in the indoor control device 101 in advance and the number of VAV control devices 1A1 is increased one after another in each room, for example, when a central air conditioning system is installed in a new building, If the building is expanded several years later, by purchasing and adding an additional VAV control device IAI and room sensor IA6, it will be possible to provide comfortable and energy-saving air conditioning for each room using the VAV method.

〔Effect of the invention〕

As described above, according to the present invention, even if a central air conditioning system with a low initial cost is purchased and installed, later the air conditioning of the entire house can be set at individual temperatures in each room, resulting in energy savings. and highly comfortable VAV
The method has the effect of being able to be changed at low cost.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing the entire main part of the duct type air conditioner according to the present invention, FIG. 2 is a circuit diagram showing an example of the communication control configuration according to the present invention, and FIG. 3 is a VAV A circuit diagram showing a specific example of a communication system between a control unit and a room controller, FIGS. 4(a) and 4(b) are explanatory diagrams showing a serial communication protocol in this invention, and FIGS. 5, 6, and 7. 8 and 9 are flowcharts for explaining the present invention in detail, FIGS. 8 and 9 are circuit diagrams of a transmission line and a control unit connected thereto, showing another embodiment of the invention, and FIG. 10 is a conventional air flow diagram. FIG. 11, which is a system configuration diagram showing the entire harmonizer, is a block diagram of a conventional control section. 1...Room, 2...Indoor unit, 5...Blower, 6...
... Main duct, 7... Branch duct, 9... Damper,
14... Room controller, 15... Temperature detector, 16... Pressure detector, 17... Outdoor unit, 19...
・Main control, 19A...Damper motor, 1
01... Indoor control device, 104... VAV control device, 105... Intake air detection thermistor, l0IA,
104A, 14A. 17D... Serial transmission circuit, 106... Transmission line. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (8)

[Claims] (1) In a duct-type air conditioner that distributes temperature-controlled air to each room using air ducts for air conditioning, it is not possible to control the air conditioning of each room at the same time based on intake air temperature information. An indoor control device, a room controller that is added as an option after the installation of the above indoor control device and also sets and detects the temperature of each room, a room controller that is connected to the above indoor control device as an option later and receives temperature information and room information from the room controller. A duct comprising a variable air volume (VAV) control device that transmits air blowing pressure information to the indoor control device and adjusts the opening degree of a damper provided at a duct air distribution destination in each room based on the temperature information and room information. type air conditioner. (2) Information transmission between the indoor control device and the variable air volume control device and between the variable air volume control device and the room controller is performed by a digital transmission circuit. Duct type air conditioner. (3) The transmission signal between the transmission circuits is composed of serial bit signals, and these signals include an identification signal for establishing a data link between the control devices. The ducted air conditioner described. (4) The duct type air conditioner according to claim 2, wherein a transmission line connecting the transmission circuits of the indoor control device, the variable air volume control device, and the room controller is common. (5) The duct type air conditioner according to claim 2 or 3, wherein the transmission line also serves as power wiring. (6) The duct type air conditioner according to claim 2, wherein the transmission path is comprised of commercial power wiring inside and outside the residence. (7) The duct type air conditioner according to claim 1, wherein the room controller is provided with means for individually setting heat load information for each room. (8) The scope of claims characterized in that the indoor control device controls the capacity of the blower and the outdoor heat source device based on room information and blowing pressure information transmitted from the variable air volume control device. The duct type air conditioner according to paragraph 1.