JPH0727405A - Controller for air-conditioning device - Google Patents

Abstract

PURPOSE:To control an air conditioner by providing first, second, and third lines between a heat source apparatus and each of terminal apparatuses, a change-over switch at each terminal apparatus, and a means of controlling the supply of heat medium which is placed at the heat source apparatus and acts in response to the output of detective means. CONSTITUTION:To a single heat source apparatus 1 terminal apparatuses 2a-2c are connected by means of first lines L1a-L1c, second lines L2a-L2c, and third lines L3a-L3c. At each of the terminal apparatuses 2a-2c a change-over switch 3 is provided with a common contact 4 connected to the first line L1a, individual contacts 5, 6 connected respectively to the second lines L2 and the third lines L3. To detect the temperature of the rooms, temperature detecting elements 7 are provided, and to set the target temperature, temperature-setting devices 8 are provided and their outputs are fed to processing circuits 9. To these processing circuits 9 signals from the contacts 4, 5, 6 are also fed. The processing circuits 9 periodically turn on and off switching elements provided respectively in the lines L1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner that cools and heats a room by means of a terminal, and more particularly to a structure for communication between a heat source device and the terminal.

[0002]

2. Description of the Related Art In a device for cooling or heating by supplying a heat medium from a single heat source device, for example, cold water or hot water, to a plurality of indoor units, each of which is an indoor unit, sends an electric signal from each terminal. Then, in controlling the operation for cooling or heating of the heat source device, in a certain prior art, the heat source device and each terminal device are connected by a pair of transmission lines, and from each terminal device, A plurality of types of signals having different voltages are transmitted. In this prior art, since a voltage different from each other is applied to each heat source device, the voltage detected by the heat source device cannot be accurately detected. Further, in the prior art that transmits such a voltage, the resistance of the transmission line changes the voltage value detected by the heat source device, which may cause a malfunction.

In another prior art, the serial signal from each terminal is commonly sent to the heat source device via a pair of transmission lines. In this prior art, when serial signals are simultaneously sent from a plurality of terminals, the serial signals are mixed in the heat source device and cannot be detected by the heat source device.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner capable of accurately detecting electric signals from a plurality of terminals in a single heat source device and controlling the air conditioner. It is to provide a control device for the device.

[0005]

SUMMARY OF THE INVENTION The present invention provides a control device for an air conditioner that supplies a heat medium from a single heat source device to each of a plurality of terminals to perform air conditioning. First, second, and third lines are provided between each terminal, and each terminal is provided with a changeover switch for switching and connecting the first line to the second or third line. The machine is provided with means for detecting the switching state of conduction / interruption between the first line and the second or third line, and means for controlling the supply of the heat medium in response to the output of the detection means. Is a control device for an air conditioner.

Further, according to the present invention, when the switching state detecting means detects the continuous conduction between the first line and the second line, the control means causes the cooling operation to be performed, and the first line and the third line are connected. When continuous conduction of is detected,
The control means is characterized by performing heating operation.

Further, the present invention is characterized in that the control means stops the operation when the switching state detecting means detects that the first line remains disconnected from the second and third lines.

According to the present invention, each terminal has a temperature detecting element and a temperature detecting element that responds to the output of the temperature detecting element when the detected temperature becomes less than a first predetermined temperature during cooling or when the temperature is detected during heating. And a means for periodically connecting / disconnecting between the first line and the second line or between the first line and the third line when the temperature exceeds a predetermined second temperature. And

Further, the present invention is characterized in that the control means responds to the output of the switching state detecting means by the periodic conduction / interruption means to stop the cooling or heating operation and put it in the standby state.

[0010]

According to the present invention, a single heat source unit and a plurality of terminals are connected to each other through three lines, each terminal is provided with a changeover switch, and the common first unit is provided. The line is switched and connected to the second or third line, and in the heat source device, the switching state of conduction / interruption between the first line and the second or third line is detected, and the heat medium is responsive to the detected output. Cooling or heating is performed by controlling the supply of cold water or hot water. In this way, the first line is conducted / interrupted with the second or third line, so that there are a total of five states, that is, (a) the first line and the second line are continuously conducted, (b) A state where the first line and the second line are periodically conducted / interrupted, (c) a state where the first line and the third line are continuously conducted, (d) a first line and the third line Are periodically conducted / interrupted, and (e) the first line remains continuously interrupted by both the second and third lines, and The signal can be sent from the terminal to the heat source device.

According to the invention, the continuous conduction between the first line and the second line corresponds to the cooling operation, and the continuous conduction between the first line and the third line corresponds to the heating operation. When the detected temperature in the room drops below the first temperature during cooling, or when the detected temperature rises above the second temperature during heating, the first line and the second line are separated from each other. Or between the first line and the third line is periodically connected / shut off to maintain the cooling or heating operation state of the heat source device in the standby state. This is a certain one
When the periodic conduction / interruption state is performed between one terminal and the first line and the second or third line, continuous conduction for cooling or heating is achieved in another terminal. When this is done, the signal for cooling or heating is preferentially detected by the switching state detecting means in the heat source device, and smooth operation can be achieved.

[0012]

1 is a block diagram showing the electrical construction of a controller for an air conditioner according to an embodiment of the present invention.
In the single heat source unit 1, a plurality (3 in this embodiment) of terminals 2a to 2c, which are indoor units, are connected to the first lines L1a and L1.
b, L1c, second lines L2a, L2b, L2c and third lines L3a, L3b, L3c, respectively. The terminals 2a, 2b, 2c have the same configuration,
Corresponding parts are designated by the same numerals with suffixes a, b, and c, and these suffixes a, b, and c are generally omitted. The terminal 2 is provided with a changeover switch 3, and the changeover switch 3 has a common contact 4 connected to the first line L1a, a second line L2 and a third line L3.
There are provided individual contacts 5 and 6 respectively connected to. A temperature detection element 7 is provided to detect the indoor temperature, and a temperature setter 8 is provided to set a target temperature for cooling or heating the room. The outputs of these are provided by a processing circuit 9 implemented by a microcomputer or the like. Given to.
The signal of each contact 4, 5, 6 is also applied to this processing circuit 9. The processing circuit 9 can periodically turn on / off the switching element 10 interposed in the line L1.

The heat source device 1 is provided with a processing circuit 11 realized by a microcomputer or the like, and the processing circuit 11 is connected to each of the lines L1, L2 and L3.

FIG. 2 is a cold / hot water piping system diagram of the embodiment shown in FIG. The heat source device 1 selectively selects either cold water for cooling operation or hot water for heating operation,
The cold water or hot water supplied from the pipe 12 to the respective heat source units 2 via the header 13 and 14 is returned from the pipe 15 to the heat source unit 1 via the header 16 and the pipe 17 and is thus a heat medium. Cold or hot water is circulated. Terminal 2
In, the cold water or hot water from the pipe 14 is supplied to the heat exchanger 18, the fan 19 is driven when each terminal 2 is in operation, and the temperature inside the room is detected by the temperature detecting element 7. The cold water or the hot water can be opened / closed by the open / close valve 20, and thus the room in which each terminal 2 is provided can be cooled or heated.

FIG. 3 is a diagram for explaining the operation of the embodiment shown in FIGS. 1 and 2, and FIG. 4 is a flow chart for explaining the operation of the processing circuit 9 provided in the terminal 2. Yes, FIG. 5 is a flow chart for explaining the operation of the processing circuit 11 provided in the heat source device 1.
3 (1) shows the switching state of the changeover switch 3 of the terminal 2a, and FIG. 3 (2) shows the switching state of the changeover switch 3b of the terminal 2b.
(3) is a diagram showing an operating state of cooling and heating of the heat source device 1. In order to perform cooling in the terminal 2a, the common contact 4a of the changeover switch 3a is changed to the individual contact 5a, as shown in FIG.
It is assumed that the electric conduction occurs at time t1. At this time, the on-off valve 20a is opened and the fan 19a is driven.
In the processing circuit 9a, the process moves from step a1 to a2 in FIG. 4 to step a3, and if the room temperature T detected by the temperature detecting element 7 is equal to or higher than a predetermined temperature T1, the switch 10a remains in the conductive state. keep.

In the processing circuit 11 of the heat source device 1, the process moves from step b1 to b2 in FIG. 5 to detect that the first line L1 and the second line L2 are electrically connected, and the next step b3.
Then, the conducting period W is a predetermined period W1.
It is determined whether or not it continues for a time exceeding the above time, and if so, the process moves to step b4, and the flag N2 is logical "1".
To determine if. The flag N2 indicates that the heat source device 1 is in the heating operation or in the standby state for the heating operation. At this time, since the flag N2 is the logic “0”, the process proceeds to the next step b5, and the heat source device 1 performs the cooling operation. To do. Here, the flag N1 is set to logic "1" to indicate that the cooling operation state or the cooling standby state. Thus, after the time t2, the cooling operation is continued.

When the time t3 is reached, it is detected in the processing circuit 9a in step a3 of FIG. 4 that the detected temperature T in the room is lower than the first temperature T1, and accordingly, the processing circuit 9a switches the switching element in step a4. 10a is periodically turned on / off. The switching element 10a is cut off during the period W3 between the times t3 and t4, is turned on during the period W0 between the times t4 and t5, is turned off during the period W3 between the times t5 and t6, and the same periodic conduction / cutoff state is repeated thereafter. .

W0 <W1 (1)

In the processing circuit 11 of the heat source unit 1, the line L
When it is determined that the conduction period W of 1 and L2 is the period W1 or less, the process proceeds from step b3 to step b7.
The cooling operation of the heat source device 1 is stopped to enter the standby state, and the flag N1 is set to logic "1" in step b8.

When the temperature T in the room rises above the temperature T1 at time t7, the processing circuit 9a goes through step a3 and keeps the switching element 10a conductive. As a result, in the processing circuit 11 of the heat source device 1, the time t
At time t8 when time W1 has elapsed from 7, the cooling operation is restarted at step b5 through steps b3 and b4 in FIG.

In the terminal 2b, when the common contact 4b of the changeover switch 3b of the terminal 2b is electrically connected to the individual contact 6a for heating at time t34 between the times t3 and t4,
In the processing circuit 11 of the heat source device 1, the time t9 and t10 are passed and then the process moves to t11. At this time, in the terminal device 2a, the common contact 4a of the changeover switch 3a is conducted to the individual contact 5a for the cooling operation. As a result, since the flag N1 is the logic "1" in step b6 or b8 described above, there is no possibility that the heating operation is performed in the heat source device 1 by moving from step b11 to step b20.

At time t9, when the changeover switch 3a is cut off and the common contact 4a is in the neutral state where it is not electrically connected to the individual contacts 5a and 6a for a predetermined time W2 or longer, this is indicated by the processing circuit 11 in FIG. Steps b16 to b17 and then to b18, the operation of the heat source device 1 is stopped at time t10, and in the next step b19,
Both flags N1 and N2 are reset to logic "0". Here, W3 <W2 (2) is established.

At time t11 when time W1 has further elapsed from time t10, the common contact 4b of the changeover switch 3b in the terminal 2b is electrically connected to the individual contact 6b for heating, and the time is predetermined from time t10. When it is determined in steps b9 to b10 in the processing circuit 11 of the heat source device 1 that the time is W1 or more, it is determined in step b11 whether the flag N1 is logic "1". To step b
Since the flag N1 is logical "0" in 19, the heating operation of the heat source device 1 is started after time t11 in the next step b10. In step b13, the flag N2 is set to logic "1", and it is stored that the heating operation or the heating standby state is set. In this way, in the heating operation, in the processing circuit 9b of the terminal 2b, the process moves from step a5 to step a6 in FIG. 4, and the room temperature T detected by the temperature detecting element 7b is less than the predetermined temperature T2 for heating. If there is, the switching element 10b is kept conductive. At time t12, when the room temperature during heating becomes equal to or higher than a predetermined temperature T2,
The processing circuit 9b has steps a6 to a7 in FIG.
Then, the switching element 10b is periodically turned on / off. That is, at time W3 from time t12 to time t13, switching element 10a is shut off, and time t13 to t1.
In the period W0 of 4, the switching element 10b is cut off in the period W3 of the time t14 to t15, and the periodical conduction / cutoff operation is repeated.

When it is determined at time t16 that the room temperature T detected by the temperature detecting element 7 in the terminal 2b is equal to or lower than the predetermined temperature T2, the processing circuit 9
b keeps the switching element 10b conductive in steps a6 to a61. Therefore, at time t17 when time W1 has elapsed from time t16, the processing circuit 11 of the heat source device 1 restarts the heating operation at b12 via steps b9, b10, and b11.

Since the conduction period W0 of the switching element 10b is shorter than the predetermined time W1 as described above, the processing circuit 11 moves from step b10 to step b14 to stop the heating operation of the heat source unit 1 and wait for heating. In step b15, the flag N2 is kept at logic "1".

At time t18, the common contact 4a of the changeover switch 3b of the terminal 2b is turned off without conducting to any of the individual contacts 5b and 6b to be in a neutral state, and a predetermined time W2 has elapsed from the time t18. Time t1
9, the processing circuit 11 causes the steps b16, b17
After that, the operation of the heat source device 1 is stopped at b18.

In the terminal 3a, when the common contact 4a of the changeover switch 3a is brought into conduction with the individual contact 5a for cooling in the time t78 between the times t17 and t18, the time W20 elapses from the time t19 by the time W20. In the heat source machine 1, the steps b2 and b of the processing circuit 11 are performed.
After 3 and b4, the cooling operation is restarted at b5.

The operation corresponding to the conduction / interruption state of the lines L1, L2 and L3 is as shown in Table 1.

[0029]

[Table 1]

[0030]

As described above, according to the present invention, the single heat source device and each of the plurality of terminal devices are connected via the first, second and third total three lines, respectively. In the terminal device, the changeover switch connects the first line to the second or third line by switching, and in the heat source device, for example, the first line is continuously connected to the second line to perform the cooling operation, and the first line. The heating operation is performed by continuously connecting the 1st line and the 3rd line, and therefore, the cooling / heating operation control of the heat source device can be performed from each of the plurality of terminals.

Further, according to the present invention, when the detected indoor temperature drops below the first temperature during cooling, or when the detected indoor temperature rises above the second temperature during heating, the first Between 1st line and 2nd line or 1st line
The line and the third line are periodically connected / disconnected, whereby the cooling / heating operation of the heat source device can be put in a standby state.

Further, according to the present invention, when such a periodical conduction / interruption switching operation is being performed, the first terminal for cooling or heating in another terminal.
When the line is continuously conducted to the second or third line, the control for the cooling / heating operation is prioritized, and the smooth cooling or heating operation can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a control device for an air conditioner according to an embodiment of the present invention.

FIG. 2 is a piping system diagram of the embodiment shown in FIG.

FIG. 3 is a diagram for explaining the operation of the embodiment shown in FIGS. 1 and 2.

FIG. 4 is a flowchart for explaining the operation of the processing circuit 9.

5 is a flowchart for explaining the operation of the processing circuit 11. FIG.

[Explanation of symbols]

1 heat source device 2a, 2b, 2c terminal device 3a, 3b, 3c changeover switch 7a, 7b, 7c temperature detection element 8a, 8b, 8c temperature setting device 9a, 9b, 9c processing circuit 10a, 10b, 10c switching element 11 processing circuit L1a, L1b, L1c; L2a, L2b, L2c; L
3a, L3b, L3c Transmission line 14a, 14b, 14c Heat medium supply line 15a, 15b, 15c Heat medium return line

Claims (5)

[Claims] 1. A control device for an air conditioner that supplies a heat medium from a single heat source device to each of a plurality of terminals to perform air conditioning, wherein a first device is provided between the heat source device and each of the terminals. First, second and third lines are provided, each terminal is provided with a changeover switch for switching and connecting the first line to the second or third line, and the heat source device is connected to the first line. An air conditioner characterized by comprising means for detecting a switching state of conduction / interruption with the second or third line, and means for controlling the supply of the heat medium in response to the output of the detecting means. Control device for. 2. The first switching means for detecting a switching state
When continuous conduction between the line and the second line is detected, the control means performs the cooling operation, and when continuous conduction between the first line and the third line is detected, the control means performs heating. The control device for the air conditioner according to claim 1, wherein the control device is operated. 3. The control means stops the operation when the switching state detecting means detects that the first line remains disconnected from the second and third lines. Air conditioner control device. 4. Each terminal has a temperature detecting element and a detected temperature which is responsive to the output of the temperature detecting element when the detected temperature is below a predetermined first temperature during cooling or when the heating is performed. When the temperature rises above the second temperature, the first
The control device for an air conditioner according to claim 1, further comprising means for periodically connecting / disconnecting between the line and the second line or between the first line and the third line. . 5. The control means stops the operation of cooling or heating and puts it in a standby state in response to the output of the switching state detecting means by the periodic conduction / interruption means. For air conditioners in the United States.