JPH0535638B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention reduces the transmission and reception of signals between the main body of an air conditioner and a remote control device connected to the main body of the air conditioner via a crossover wire. This invention relates to an improvement in a signal transmission device for an air conditioner that can be transmitted regardless of the number of crossover wires.

(Prior Art) The present applicant has previously proposed a technique disclosed in Japanese Patent Laid-Open No. 59-21935 as a technique for reducing the number of crossover wires. This device converts a large number of control signals, including operation mode signals such as cooling/warming switching signals and air volume setting signals, into a single coded signal within a remote control device (hereinafter referred to as the remote control device), and then converts this signal into a single coded signal. The number of crossover wires is reduced to one by transmitting the encoded signal to the air conditioner main body via one crossover wire and decoding this encoded signal into a large number of control signals within the air conditioner main body. This is what I did.

(Problem to be Solved by the Invention) However, the above proposal requires an integrated circuit such as a code converter in the remote control device, making it expensive. If the number of operation modes is small, it is disadvantageous in terms of cost to provide an integrated circuit or the like, and it is difficult to adopt this for equipment that requires low cost.

Therefore, when we examined the functions provided in the remote control device, we found that there are two main functions: generation of operation mode signals such as air volume setting signals, and display functions such as operation display and cooling or heating operation display. Mechanisms with the latter function are always supplied with power from the air conditioner body, and mechanisms with the latter function are supplied with power from the air conditioner body only when the air conditioner is operating due to the operation display function, and the remote control In this situation, the power supply to the equipment is divided into two systems. Focusing on this, the operation mode signal generation mechanism and various display mechanisms are connected in parallel to integrate the power supply to the remote control device into one system, and the power supply to the operation mode signal generation mechanism is the same as the operation display mechanism. It is conceivable to do this only when the air conditioner is operating, thereby omitting one crossover wire.

However, in the above case, if the operation mode signal from the remote controller is transmitted to the air conditioner body via a crossover wire different from the power crossover wire, the remote controller An operation mode signal is generated in the device, and this operation mode signal is transmitted to the air conditioner main body via the other crossover wire, so when power is supplied from the air conditioner main body to the remote control device, and when the air conditioner main body There is a time difference between when the operation mode signal is received from the device,
For this reason, if the operation mode of the air conditioner itself is determined at the same time as the start of operation, the air conditioner will malfunction, which is not preferable.

The present invention has been made in view of the above, and its purpose is to supply power from the air conditioner main body to the remote control device in one system and only during operation, and to supply power from the remote control device to the air conditioner main body during operation. When transmitting the mode signal via a crossover wire that is different from the crossover wire for power supply, the start of determining the operating mode on the air conditioner itself is slightly delayed from the time when power supply to the remote control device starts. By doing so, it is possible to omit one crossover wire while ensuring normal operation of the air conditioner, thereby reducing the number of crossover wires at low cost.

(Means for Solving the Problem) In order to achieve the above object, the solving means of the present invention includes an air conditioner main body 7 and a connecting wire 8, 9 connected to the air conditioner main body 7, as shown in FIG. In a signal transmission device for an air conditioner that sends and receives signals to and from a remote control device 14 connected to the remote control device 14, the remote control device 14 includes an operation mode setting means 30 for setting an operation mode for indoor air conditioning; An operating state display means 31 is provided which is connected in parallel to the operating mode setting means 30 and displays the operating state of the air conditioner. On the other hand, the air conditioner body 7 includes a power supply means TrB that starts supplying power to the operation mode setting means 30 and the operation state display means 31 of the remote control device 14 through one crossover wire 8 for the first time when an operation is requested; The operation mode setting means 30 starts operating when a predetermined period of time to has elapsed after the power supply means TrB is supplied with power, and the operation mode setting means 30
The driving mode determining means 33 receives the driving mode signal via a connecting wire 9 separate from the connecting wire 8 for power supply and determines the driving mode.

(Function) As described above, in the present invention, when the air conditioner starts operating, the power supply means TrB supplies power to the remote control device 14 for the first time, and the operation mode signal setting means 30 of the remote control device 14 outputs the operation mode signal. At the same time, the operating state display means 31 displays operating conditions such as cooling and heating.

Then, the operation mode signal generated by the remote control device 14 is transmitted to the air conditioner body 7 via a crossover wire 9 different from the power crossover wire 8, and after a predetermined period of time has elapsed, the operation mode of the air conditioner body 7 is determined. The means 33 will start operating and the operating mode will be determined. As a result, the air conditioner will start operating correctly even in the operating mode set on the remote controller 14 side without malfunctioning.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows the overall configuration of an operation control device for a separate type air conditioner. In the figure, the left side of the one-dot chain line indicates the outdoor unit side, and the right side of the two-dot chain line indicates the indoor unit side. Power supply voltage is between R phase and S phase 2
They are connected via three crossover wires: two voltage buses 1 and 2 and a signal transmission connection wiring 3.

On the outdoor unit side, an electromagnetic switch 52C for driving the compressor, a four-way switching valve 20S, first and second outdoor blower fans MF01 and MF02, and an outdoor control circuit 4 that controls the operation of each device, A protection device 5 is provided to protect the compressor from overcurrent, abnormally high pressure of refrigerant, etc. The outdoor control circuit 4 is provided with an activation signal of the protection device 5 through a photocoupler.
It is input via PHC. On the other hand, the indoor unit side is equipped with an indoor blower fan MF11 and an indoor control circuit 7 that controls the rotation speed of the indoor blower fan MF11. A remote control device 14 placed at an appropriate location in the room is connected via the remote control device 14, and the remote control device 14 transmits signals to the outdoor unit such as a cold/warm switching signal, a defrosting command signal, and a compressor ON/OFF signal. An OFF signal and a run/stop signal are output to the indoor control circuit 7.

The outdoor and indoor control circuits 4 and 7 are connected to transmitting and receiving circuits 15 and 1 for signal transmission between the two, respectively.
5, each transmitting/receiving circuit 15, 15 is interposed in the middle of transmission wiring 16, 16 that connects the R phase and S phase of the three-phase AC power supply via the signal transmission crossover wire 3. Both transmitting and receiving circuits 15, 1
5 transmits and receives a signal via the signal transmission crossover wire 3, transmits a protection device activation signal from the outdoor control circuit 4 to the indoor control circuit 7, and controls the indoor ventilation fan MF.
11 and indoor control circuit 7.
From the above cold/warm switching signal, defrost command signal, compressor
The ON-OFF signal and the run/stop signal are transmitted to the outdoor control circuit 4, and the former two signals control the operation of the four-way switching valve 20S, and the latter two signals control the operation of the compressor drive electromagnetic switch 52C and the first and the second
The outdoor blower fans MF01 and MF02 are operated and controlled.

Next, a signal transmission system between the indoor control circuit 7 as the air conditioner main body and the remote control device 14 will be explained. FIG. 3 shows the internal configuration of the indoor control circuit 7 and the remote control device 14. Indoor control circuit 7 in the same figure
, 52FH, 52FM, and 52FL are normally open contacts 52FH-, which rotate the indoor ventilation fan MF11 shown in Fig. 2 at high speed, medium speed, and low speed, respectively.
The three indoor fan control relays and ICs having 1,52FM-1,52FL-1 are indoor integrated circuits, and the indoor integrated circuit IC has the above three indoor fan control relays 52FH, 52FM, and 52FL.
This is for controlling the rotation speed of the indoor fan MF11 through ON-OFF control, and for transmitting and receiving signals to and from the remote control device 14.

Next, before explaining the rest of the indoor control circuit 7, the internal configuration of the remote control device 14 will be explained for convenience. In the remote control device 14, 20 is an air volume changeover switch that changes the airflow rate into three levels: "sudden", "strong", and "slight"; 21 is a bipolar cold/warm changeover switch;
22 is a light emitting diode for displaying cooling operation that can be lit when the cooling/heating switch 21 is switched to the cooling side;
Similarly, reference numeral 3 designates a heating display light emitting diode that can be turned on when the cold/warm changeover switch 21 is switched to the heating side. Further, 24 is a room temperature setting device for setting a target room temperature, 25 is a run/stop button, 26 is a sending diode for displaying defrosting operation connected in parallel to the run/stop button 25, and 27 is an air intake port of the indoor unit. An air filter cleaning reminder light emitting diode 28 is connected in parallel to the air filter cleaning reminder light emitting diode 27 and is an air filter cleaning display reset switch which is pressed after the air filter has been cleaned. Then, an operation mode setting means 30 is configured to appropriately switch and set each operation mode of "airflow", "cooling", and "heating" for indoor air conditioning using the air volume changeover switch 20 and the cooling/heating changeover switch 21. In addition, the light emitting diodes 22 and 23 for displaying cooling and heating operations are connected in parallel to the operation mode setting means 30 to indicate the cooling and heating operations of the air conditioner main body. Operating status display means 3 for displaying status
1.

The remote control device 14 also has six switching states: "sudden", "strong" and "slight" switching states of the air volume selector switch 20, and cooling side and heating side switching states of the cooling/warming selector switch 21. A voltage level changer 32 is provided to change the voltage level Vs of the operating mode signal transmission crossover wire 9, which is separate from the power supply crossover wire 8, into six levels depending on the combination. The voltage level 32 is determined by two resistors R1 and R2 that divide a predetermined voltage V from a power supply crossover wire 8, which will be described later, and set the voltage level Vs of the operation mode signal transmission crossover wire 9 to a reference value Vo. A resistor R3 with a relatively high resistance value is connected in a wave train with the resistor R1 when the air volume selector switch 20 is switched to the "sudden" side, and is also parallel to the resistor R1 when the air volume selector switch 20 is switched to the "slight" side. a resistor R4 with a relatively low resistance value connected to;
A resistor R5 is connected in parallel to the resistor R2 when the cooling/warming switch 21 switches to heating, and the "strong" terminal of the air volume switching switch 20 and the cooling side terminal of the cooling/warming switch 21 are connected in parallel to the resistor R2. Each is open, and the air volume selector switch 2
0 and the voltage level of the operating mode signal transmission crossover wire 9 according to the switching state of the cold/warm selector switch 21.
As shown in FIG. 4, Vs is changed in six stages centered around the reference level Vo.

Next, to explain the rest of the indoor control circuit 7, the above-mentioned indoor integrated circuit IC outputs an output only after receiving an operation signal when air conditioning operation is requested, that is, when the operation/stop button 25 of the remote control device 14 is operated. It has a function to start outputting a power supply command signal from terminal PBO. In addition, TrB is turned on in response to a power supply command signal from the output terminal PBO of the indoor integrated circuit IC, and is turned on to a predetermined voltage V (for example,
16V) to the operation mode setting means 30 and operation state display means 31 of the remote control device 14 via the power supply connecting wire 8.

Reference numeral 33 denotes an operation mode discriminator as an operation mode discriminator for determining the operation mode by detecting the voltage level Vs of the crossover wire 9 for transmitting the operation mode signal. A comparator 34 that receives the voltage level Vs signal of the transmission crossover wire 9, a reference voltage setter 35 consisting of two resistors R6 and R7 that sets the reference voltage of the comparator 34, and a reference voltage setter 35 that sets the reference voltage of the comparator 34. The reference voltage is set to the "H" and "L" switching changes of the outputs of the output terminals P70 to P72 that occur after a predetermined period of time has elapsed after the output of the power supply command signal from the output terminal PBO of the indoor integrated circuit IC. A reference voltage level changer 36 having three resistors R8, R9, and R10 is provided to change the reference voltage level in six stages according to the change in the reference voltage level of the comparator 34. By searching for the inversion of the output of the comparator 34, the voltage level Vs of the operating mode signal transmission crossover wire 9 is detected after a predetermined period of time has elapsed after power is supplied to the remote control device 14, and this voltage is detected. It is configured to determine the operating mode by the air volume changeover switch 20 and the cooling/warming switch 21 as shown in FIG. 4 from the level Vs.

Further, in the indoor control circuit 7, the indoor integrated circuit
The IC is capable of inputting an outdoor heat exchanger defrosting command signal to its input terminal P30 and an air filter clogging detection signal to its input terminal P31, and when the defrosting command signal is input, the output terminal PB1
It has a function of outputting a defrosting operation display signal from the output terminal PB2 in response to input of a clogging detection signal, and outputting an air filter cleaning display signal that prompts air filter cleaning from the output terminal PB2. And the indoor integrated circuit
The output terminal PB1 of the IC is turned ON in response to a defrosting operation display signal, and outputs the defrosting operation display signal to the remote control device 14 via the defrosting operation display connecting wire 11, A defrosting display transistor TrD is connected to turn on the issuing diode 26, and the above output terminal PB2 is turned on in response to an air filter cleaning display signal to transmit the air filter cleaning display signal to the air filter cleaning display connecting wire 12. output to the remote control device 14 via
Air filter cleaning display transistor that lights up the air filter cleaning reminder light emitting diode 27
TrE is connected.

Further, in the indoor control circuit 7, reference numeral 41 indicates an operation/stop button 25 connected to the operation/stop button 25 of the remote controller 14 via the defrosting operation display connecting wire 11.
The run/stop signal generator 41, which is a stop signal generator, alternately generates a run command signal and a stop signal each time the run/stop button 25 is closed, regardless of whether the defrosting operation display light emitting diode 26 is lit or not. Generates a command signal and sends it to the input terminal P of the indoor integrated circuit IC.
50. Further, 42 is a cleaning display reset signal generator connected to the air filter cleaning display reset switch 28 of the remote control device 14 via the air filter cleaning display crossover wire 12, and the cleaning display reset signal generator 42 is
When the air filter cleaning display reset switch 28 is closed, an air filter cleaning display reset signal is generated regardless of whether the air filter cleaning reminder light emitting diode 27 is lit or not, and this signal is sent to the indoor integrated circuit.
This is input to the input terminal P51 of the IC. The indoor integrated circuit IC also has a function of stopping the output of the air filter cleaning display signal from the output terminal PB2 upon receiving the air filter cleaning display reset signal from the input terminal P51.

In the indoor control circuit 7 shown in FIG. 3, 50 is a room temperature sensor that detects the room temperature based on the air intake temperature from the indoor ventilation fan 6;
The room temperature setting device 24 of the remote control device 14
This is a comparator that generates a compressor ON signal or a compressor OFF signal by comparing the size with the target room temperature value. Also,
Although not shown in detail, the defrosting operation display light emitting diode 26 of the remote control device 14 is designed to blink to indicate when a drain filter for filtering drain water accumulated in the indoor unit is clogged.

Also, on the outdoor unit side in Figure 2, 52
is a normally open high-pressure switch that detects the high pressure of the refrigerant, and its closing operation pressure value is lower than the high pressure value Po (for example, around 27.5 kg/cm ² ) at which the protection device 5 operates (for example, 24Kg/ ^cm2 ), and when the high pressure switch 52 closes during heating overload, only the second outdoor fan MF02 is forcibly stopped to reduce the heating capacity, and the high pressure In a state that causes an increase in pressure, the above-mentioned high pressure value Po causes the protection device 5 to operate and the pressure is increased for a predetermined period of time (for example, 10 minutes).
Since the restart prohibition control is performed, the temperature of the indoor heat exchanger becomes a temperature value T lower than the high temperature value corresponding to the above-mentioned high pressure value Po several minutes after that.
(For example, 58℃) or above, the compressor is forcibly stopped and operation is stopped, and when the temperature falls below the temperature value T, the compressor is immediately restarted, and the frequency of abnormal stoppage due to the activation of the protection device 5 is It is designed to reduce the

Therefore, in the above embodiment, when the operation/stop switch 25 of the remote controller is pushed to the operation side, the indoor integrated circuit is activated based on the generation of the operation command signal from the operation/stop signal generator 41 of the indoor control circuit 7. A power supply command signal is output from the output terminal PBO of the IC, and the power transistor TrB turns ON.
As a result, the predetermined voltage V is first supplied with power to the operation mode setting means 30 and the operation state display means 31 of the remote control device 14 via the power supply connecting wire 8. As a result, in the remote control device 14, an operation mode signal corresponding to each switching state of the air volume changeover switch 20 and the cooling/heating changeover switch 21 is generated for the first time when power is supplied, and this signal is sent to the voltage level changer 32 via the operation mode signal transmission switch. It is converted to the voltage level Vs on the line 9 and transmitted to the indoor control circuit 7, and the cooling operation display light emitting diode 22 or the heating operation display light emitting diode 23 is lit depending on the switching state of the cooling/heating changeover switch 21. , cooling operation or heating operation is displayed.

Then, after a predetermined period of time to has elapsed after power is supplied to the remote control device 14 by turning on the power transistor TrB, the output terminal P of the indoor integrated circuit IC
With the start of switching between "H" and "L" outputs of outputs 70 to P72, the operation mode discriminator 33 starts to operate, and the voltage level of the crossover wire 9 for transmitting the operation mode signal Vs
is detected, and as a result, the air volume selector switch 2
0 and the operating mode by the cold/warm changeover switch 21 is determined.

At this time, in the remote control device 14, the operation mode setting means 30 and the operation state display means 31 are connected in parallel with each other, and a single power supply system is used to combine the power supply from the indoor control circuit 7 to these means into one system. Since this is done via the crossover wire 8, one crossover wire can be omitted compared to the conventional two-system system in which power is supplied to each means 30 and 31 individually.

In that case, after receiving the power supply, the remote control device 14 generates an operation mode signal and transmits it to the indoor control circuit 7 via another crossover wire 9 different from the power supply crossover wire 8. Indoor control circuit 7
Now, when power is supplied to the remote control device 14,
Although there is a time difference between when the operation mode signal is received, in the indoor control circuit 7, the operation mode discriminator 3
The operation start time of 3 is determined by the power transistor TrB.
Since it is set after a predetermined period of time has elapsed after the ON operation, that is, after receiving the operation mode signal from the remote control device 14, the indoor control circuit 7 and the remote control device 14 can be omitted by one.

Incidentally, in the above embodiment, the operation mode setting means 30
Although the air volume setting device 24 is configured with the air volume changeover switch 20 and the cold/warmage changeover switch 21, the room temperature setting device 24 may be configured alone or together with the changeover switches 20 and 21. Further, regarding the operation status display means 31, the light emitting diode 2 for displaying operation of cooling or heating is also used.
It is not limited to 2 or 23.

Further, in the above embodiment, the operation mode setting means 3
The operation mode signal of 0 is converted to the voltage level Vs of the crossover wire 9 for transmission of the operation mode signal and transmitted.
5 types of operation mode signals corresponding to the 5 positions of the 3 positions of "sudden", "strong" and "slight" of 0 and the 2 positions of "cold" and "warm" of the cold/warm selector switch 21. corresponding 5
The information may also be transmitted via a book crossover.
However, the above embodiment is preferable because the number of crossover wires can be significantly reduced.

Further, in the above embodiment, the case where the present invention is applied to a separate type air conditioner has been described, but the present invention is not limited to this, and it goes without saying that it can be similarly applied to an integrated type air conditioner.

(Effects of the Invention) As explained above, according to the present invention, the operation mode setting mechanism and various display mechanisms in the remote control device are connected in parallel, and the power supply to these from the air conditioner body is interrupted when operation is requested. In addition to reducing the number of crossover wires by one as a system starting at Later, the operating mode was determined for the first time by the air conditioner itself, which ensured normal operation of the air conditioner while reducing the number of crossover wires, saving construction work by embedding the crossover wires, and reducing the diameter of the crossover wires. This is preferable from a practical point of view, as it is possible to improve the design quality by changing the shape.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 4 show embodiments of the present invention, FIG. 2 is a schematic configuration diagram showing the operation control circuit of a separate air conditioner, and FIG. 3 shows the internal configuration of the indoor control circuit and remote control device. electronic circuit diagram,
FIG. 4 is a diagram showing how the voltage level of the operating mode signal transmission crossover wire changes with respect to various switching states of the changeover switch. 7... Indoor control circuit, 8... Power supply crossover wire, 9... Operation mode signal transmission crossover wire, 14...
...Remote control device, 20...Air volume selection switch, 2
1...Cool/warm selector switch, 22...Light emitting diode for cooling operation display, 23...Light emitting diode for heating operation display, TrB...Power transistor, 3
0... Operating mode setting means, 31... Operating state display means, 33... Operating mode discriminator.

Claims (1)

[Claims] 1 A signal transmission device for an air conditioner that sends and receives signals between the air conditioner main body 7 and a remote control device 14 connected to the air conditioner main body 7 via crossover wires 8 and 9. The device 14 includes an operating mode setting means 30 for setting an operating mode for indoor air conditioning, and an operating state display means 31 connected in parallel to the operating mode setting means 30 for displaying the operating state of the air conditioner. , the air conditioner main body 7 includes a power supply means that starts supplying power to the operation mode setting means 30 and the operation state display means 31 of the remote control device 14 through one crossover wire 8 for the first time when an operation is requested.
TrB and the power supply means TrB start operating when a predetermined period of time to has elapsed after power supply, and the operation mode signal of the operation mode setting means 30 is transmitted through a crossover wire 9 separate from the power supply crossover wire 8. A signal transmission device for an air conditioner, characterized in that it is equipped with an operation mode discriminating means 33 for receiving the signal through the signal transmission line and discriminating the operation mode.