JPS61236295A - Signal transmission device for air conditioner - Google Patents

Abstract

PURPOSE:To reduce the number of crossover tracks for operation mode signal transmission to one by varying the voltage level of the crossover track between an air conditioner body and a remote controller through a changeover switch, and detecting that and deciding an operation mode. CONSTITUTION:An outdoor control circuit 4 and an indoor control circuit 7 has transmitting and receiving circuits 15 and 15 for signal transmission between the both. The transmitting and receiving circuits 15 and 15 are interposed in wirings 16 and 16 for transmission which connect the R phase and S phase of a three-phase AC power source through the crossover track 3 for signal transmission. Signals are transmitted forth and back between the transmitting and receiving circuits 15 and 15 through the crossover track 3 for signal transmission to transmit a protecting device operation signal from the outdoor control circuit 4 to the indoor control circuit 7, thereby stopping an indoor air blowing fan MF11 forcibly. Further, a cooling/heating changeover signal, a dehumidification command signal, and a compressor ON-OFF signal are transmitted from the indoor control circuit 7 to the outdoor control circuit 4 to control a four-way changeover valve 20S with the two former signals and also control the operation of an electromagnetic switch 52C for driving a compressor and an outdoor air blowing fan with the two latter signals.

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. The present invention relates to an improvement in a signal transmission device for an air conditioner that uses a number of moving pictures.

(Prior Art) Generally, a remote control device (hereinafter referred to as a remote control device) for this type of air conditioner includes a cooling/heating switch, an ff1ffi switching switch, etc. that control the operating status for indoor air conditioning. In addition to being provided with a changeover switch for switching between multiple modes, the air conditioner itself is equipped with input terminals corresponding to the number of operation modes selected by the changeover switch, and the operation mode signal generated by the changeover selection of the changeover switch is provided on the air conditioner body. is transmitted to the corresponding input terminal of the air conditioner main body via a predetermined crossover wire corresponding to the switching position of the changeover switch, and the operation of the air conditioner is controlled to an operating state according to the operation mode signal. being done.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional system, one crossing line corresponds to one driving mode signal, so the number of crossing lines corresponding to the number of driving mode signals is This had the disadvantage of increasing the number of picture books needed.

Therefore, in Japanese Patent Application Laid-Open No. 59-21935, the present applicant converted a large number of control signals including the above-mentioned driving mode signal into one encoded signal within a remote control device, and converted this into one encoded signal. By transmitting the coded signal to the air conditioner main body via the book crossover wire and decoding this encoded signal into a large number of control signals within the air conditioner main body, the number of moving picture books can be reduced to one. I'm proposing something. However, with this proposal, the remote control device requires an integrated circuit such as a code converter, making it expensive, and the number of changeover switches in the remote control device is particularly small (that is, the number of operation modes is small).
In some cases, 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.

The present invention has been made in view of the above, and an object of the present invention is to transmit a plurality of operation mode signals from a changeover switch of a remote control device to the air conditioner body as a voltage level determined in advance to correspond to the operation mode signal. An object of the present invention is to be able to transmit the driving mode signal of 2000 through a single connecting wire without being encoded as in the above proposal, and to effectively reduce the number of moving picture books at low cost.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention includes an air conditioner main body (7) and an air conditioner main body (7) as shown in FIG.
) via the crossover wire (9)
4) In the signal transmission device for an air conditioner that sends and receives signals to and from the remote control device (14), the remote control device (14) includes a changeover switch (20) for switching the operating state for indoor air conditioning to a plurality of modes. (21) and the changeover switch (20).

Voltage level changing means (30) for changing the voltage level (Vs) of one crossover wire (9) according to the switching state of (21)
). On the other hand, the air conditioner main body (7) is provided with a determining means (40) that detects the voltage level (Vs) of the crossover wire (9) and determines the operation mode by the changeover switches (20) and (21). That is.

(Function) As described above, in the present invention, the voltage level (VS
) is changed by the voltage level changing means (30) to a different level value each time the selector switches (20) and (21) are switched and is transmitted to the air conditioner body (7), and then this voltage level (VS ) is detected by the determining means (40), and the operating mode determined by the changeover switches (20) and (21) is determined.

(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. Two voltage buses (1) and (2) whose power supply voltage is between the R phase and the 8th phase, and the connection arrangement for signal transmission 1! (3) is connected via three crossover wires.

On the outdoor unit side above, there is a 1" JI between electromagnetic gaps for driving the compressor.
(52C), four-way switching valve (208), first and second outdoor blower fans (MFo + ), (MFo
z), an outdoor control circuit (4) that controls the operation of each device, and a protection device (5) that protects the compressor from overcurrent, abnormally high pressure of refrigerant, etc. 4
), the activation signal of the protection device (5) is transmitted to the photocoupler (
P)-IC). On the other hand, the indoor unit side is equipped with an indoor blower fan (MFo) and an indoor control circuit (7) that controls the rotation speed of the indoor blower fan (MFll). is connected to a remote control device (14) placed at an appropriate location indoors via six connecting wires (8) to (13), and the remote control device (14) transmits data to the outdoor unit. Signals include cold/warm switching signal, defrost command signal, compressor 0
The N10FF signal and the run/stop signal are output to the indoor control circuit (7).

The outdoor and indoor control circuits (4) and (7) are respectively transmitting and receiving circuits (15) and (1) for signal transmission between the two.
5), and each of the multiple transmitter/receiver circuits (15), (15) has a three-phase AC 8I! Transmission arrangement that connects the R phase to 8 phases of the power supply via the signal transmission crossover wire (3)
16), and both transmitting and receiving circuits (15
), (15) protects from the outdoor control circuit (4) by sending and receiving signals via the 4m signal transmission bridge (3)! ! i
The device operation signal is transmitted to the indoor control circuit (7) to forcibly stop the indoor blower fan (MFu), and the indoor control circuit (7) also transmits the above-mentioned cooling/warming switching signal, defrosting command signal, and compressor 0N. - The OFF signal and run/stop signal are transmitted to the outdoor control circuit (4), and the former three signals control the operation of the four-way switching valve (2O8), and the three signals of the intruder operate the electromagnetic switch for driving the compressor. (52C) and the first and second outdoor blowing fans (MF, )+), (MF1]2).

Next, the indoor control circuit (7) and remote control equipment as the main body of the 11th aircraft! (14) The mutual signal transmission system will be explained. Figure 3 shows the indoor control circuit (7) and the remote control device (1).
4) shows the internal configuration. In the indoor control circuit (7) in the figure, (52F l-1).

(52FM), <52FL) are normally open contacts (52FH-+), (52FM-+), (52FM-+), which drive the indoor blower fan (MFn) shown in Fig. 2 at high speed, medium speed, and low speed C rotation, respectively.
(52FL-+); (IC) is an indoor integrated circuit;
H), (52FM), (52FL) ON-OF
It is used to control the rotation speed of the indoor fan (MFu) by controlling the i and IJ, as well as to send and receive signals to and from the remote control device (14).When air conditioning operation is requested, the remote control i! i! (14) Run/Stop button (2
It has a function to start outputting a power supply command signal from the output terminal (PBO) at the time of operation on the driving side of 5). Also,(
TI'a) is the output terminal (P
Upon receiving the power supply command signal from the BO), the UON is activated and a predetermined voltage (for example, 16V) is applied to the power supply crossover wire (8).
and a power transistor that supplies power to the remote control device i (14) via the ground crossover wire (13).

Next, for convenience, the internal configuration of the remote control device (14) will be described before explaining the rest of the indoor control circuit (7). In the remote control device (14), (20) is an ffl amount changeover switch that changes the airflow into three levels: "sudden,""strong," and "slight," (21) is a cool/warm changeover switch, and (22)
(23) is a light emitting diode for indicating cooling operation that lights up when the cooling/warming changeover switch (21) is switched to the cooling side; similarly, (23) is a light emitting diode for indicating heating operation that lights up when the cooling/warming changeover switch (21) is switched to the heating side. It is a diode. Also, (24)
(25) is a run/stop button; (26) is a light emitting diode for displaying defrosting operation connected in parallel to the run/stop button (25); (27) is a room temperature setting device for setting a target room temperature;
) is an air filter cleaning reminder light emitting diode (28) connected in parallel to the air filter cleaning reminder light emitting diode (27) to remind cleaning of the air filter provided at the air intake port of the indoor unit; Kiyoshi also 1
This is an air filter cleaning display reset switch that will be pressed later. The 11m changeover switch (20) and the cooling/heating changeover switch (21) constitute a changeover switch that switches the operating state for indoor air conditioning into a plurality of modes.

Further, the remote controller fil (14) is supplied with a divided voltage V from the power supply crossover wire (8).
8), two resistors R+ and R2 are used to set the voltage level VS of the operating mode signal transmission crossover wire (9) located at the lower part of the figure to the reference value VO, and A comparatively high resistance (10) resistor R3 is connected in parallel to the above-mentioned resistor R+ when switching to the ``fine'' side, and a comparatively high resistance R3 is connected in parallel to the above-mentioned resistor R1 when the 8a amount changeover switch (20) is switched to the ``fine'' side. The resistor R4 with a low resistance value and the cold/BJI
A resistor R5 is provided, which is connected in parallel to the resistor R2 when the changeover switch (21) is switched to the heating side, and the "r high" terminal of the Jilffl changeover switch (20) and the cold/heat changeover switch (21) are provided. The cooling side terminal of the is open. Therefore, the air volume selector switch (2
The operation mode signal is transmitted according to the six combinations of the "sudden", "strong", and "slight" switching states of 0) and the cooling side and heating side switching states of the cooling/warming switch (21). crossover wire (9
) as shown in FIG.
The voltage level changing means (30) is configured to change the voltage level in 6 steps mainly based on vO.

Next, to explain the rest of the indoor control circuit (7),
(31) is a voltage level detector for detecting the voltage level Vs of the operating mode signal transmission crossover m(9), and the voltage level detector (31) is connected to the operating mode signal transmission crossover (9). A comparator (32) receiving the voltage level S signal of
, a reference voltage setter (33) consisting of two resistors R6R7 that sets the reference voltage of the comparator (32), and a reference voltage of the voltage setter (33) that sets the reference voltage of the indoor integrated circuit (1C).
), three resistors (Ra), (R
G) and (Rh+), and by sequentially changing the reference voltage of the comparator (32) by the m quasi-air pressure level changer (34), the comparator ( 32), the voltage level Vs of the operating mode signal transmission crossover wire (9) is detected, and from this voltage level VS, the 11ffi changeover switch (20) as shown in FIG. and a determining means (40) configured to determine the operating mode by the cooling/warming switch (21).

In the indoor control circuit (7), the indoor*8!1 circuit (IC) receives the defrosting command signal of the outdoor heat exchanger at its input terminal (P2O), and the input terminal (P31) indicates that the air filter is clogged. Each detection signal can be input, and when the defrost command signal is input, a defrost operation display signal is output from the output terminal (PBl), and when the clogging detection signal is input, the air filter is output from the output terminal (PB2). Output the air filter cleaning display signal that evokes m '411 1! It has the ability to control.

Then, the output terminal (PBl) of the indoor integrated circuit (IC)
When the defrosting operation display signal is received, the defrosting operation display signal is turned ON and the defrosting operation display signal is output to the remote control device (14) via the defrosting operation display signal line (11), and the defrosting operation display light is emitted. Defrost display transistor (
Tro) is connected, and the output terminal (PB2) is turned on in response to the air filter cleaning display signal.
In operation 1, the air filter cleaning display signal is sent to the remote control device (14) via the air filter cleaning display crossover wire (12).
) and a light emitting diode (
27) is connected to an air filter cleaning display transistor (Trε) that lights up.

Furthermore, in the indoor control circuit (7), (41) is the operation/stop button (25) of the remote control device ('13).
a run/friction signal generator connected to the defrost operation display signal line (11), the run/stop signal generator (41) being connected to the For each operation, an operation command signal and a stop command signal are generated alternately regardless of whether the defrosting operation display light emitting diode (26) is lit or not, and these signals are sent to the input terminal (P2O) of the indoor integrated circuit (IC).
This is what you input. (42) is the air filter cleaning display reset switch (
28) via an air filter cleaning display crossover wire (12), the cleaning display reset signal generator (42) is connected to the air filter cleaning display reset switch (28). When the air filter 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 input to the input terminal (P51) of the indoor integrated circuit (IC). It is. And the indoor integrated circuit (rc)
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), and (51) is the room temperature sensor (50).
Remote control device for room temperature from! f(14) room temperature setting device (
24) Room temperature 4! l! This is a comparator that generates a compressor ON signal or a compressor OFF signal by comparing the magnitude with the number. Further, although not shown in detail, the light emitting diode (26) for displaying defrosting operation of the remote control device (14) blinks to indicate when the drain filter applied to the source of drain water accumulated in the indoor unit is clogged. being done.

Further, on the outdoor unit side in Fig. 2, (52) is a normally open high pressure r#JI3Jff device that detects the high pressure of the refrigerant, and its closing operation pressure value is determined by the activation of the protection device (5). High pressure jt1Po (e.g. around 27°5-/d)
(for example, around 241al/cj), and when overloaded, the pressure switch (52
) closes, only the second outdoor blower fan (MFO2) is forcibly stopped and the heating capacity is reduced, and the state is maintained in a state that causes a high pressure rise [゛ is the above high pressure value Pl]:f! The device (5) is activated for a predetermined period of time (for example, 10
minutes), restart prohibition control is performed, so that the temperature of the indoor heat exchanger rises to the above-mentioned high pressure value Pa after several minutes have passed.
Temperature value T lower than the high temperature value corresponding to η (e.g. 58℃
), the compressor is forced to stop and operation is stopped, and when the temperature drops below the temperature value T, the compressor is immediately restarted to prevent frequent abnormal stoppages due to the activation of the protection device (5). Efforts are being made to reduce this.

Therefore, in the above embodiment, the remote control device (1
Corresponding to the combination of the switching state of the Jall selection switch (20) and the switching state of the cooling/heating selection switch (21) in 4), the voltage level Vs of the crossover wire (9) for transmitting the operation mode signal changes to the voltage level. After being changed by the changing means (30) as shown in FIG. 4 and transmitted to the indoor unit, this voltage level VS is detected by the determining means (40) of the indoor control circuit (7), and the voltage level VS is detected by the determining means (40) of the indoor control circuit (7). (2
0) and (21), that is, the contents of the wind @ setting signal and the cold/warm switching signal, the remote control device (14) is determined.
) and the indoor control circuit (7), the crossover wire for transmitting the operation mode signal between them can be reduced to one.
IIM selector switch) "Sudden J," Strong J, [Fine J]
3 crossover wires corresponding to the 3 positions, and 2 wires corresponding to the 2 positions of "cooling" and "heating" of the cooling/heating switch (21).
For those requiring a total of 5 crossover wires including the book crossover wire,
The number of crossover wires can be effectively reduced.

Moreover, the remote control device (14) includes five resistors (R+
) to (R5), and since no integrated circuit is required, the remote control device (14) can be constructed at low cost.

In the above embodiment, I! lff1 selector switch (20
) and the combination of each switching state of the cold/warm selector switch (21), one crossover wire for transmitting the operation mode signal (
Although the voltage level VS in 9) is changed in six steps, the present invention is not limited to this, and for example, the voltage level VS may be changed in accordance with the switching state of only the windscreen changeover switch (20). Of course, the changeover switch is II1f.
It is not limited to FI or those that switch between cold and warm. Further, the type of air conditioner is not limited to a separate type, but may be an integrated type.

(Effects of the Invention) As explained above, according to the present invention, the voltage level of one connecting wire connecting the air conditioner main body and the remote control device can be changed according to the switching state of the changeover switch of the remote control device. After being transmitted to the air conditioner, this voltage level is detected by a discrimination circuit on the air conditioner's side to determine the operating mode by the changeover switch. The number of crossover wires for transmitting operation mode signals to the air conditioner body can be reduced to one tree at low cost.
Practical use-L1 is preferable because it is possible to improve the design by reducing the diameter of the crossover wire and to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. FIGS. 2 to 4 show embodiments of the present invention, and FIG. 2 is a schematic configuration diagram showing the operation control circuit of a separate air conditioner. FIG. 3 is an electronic circuit diagram showing the internal configuration of the indoor control circuit and the remote control device, and 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, (9)...Operation mode signal transmission crossover wire, (14)...Remote control device, (20
)...Air volume selection switch, (21)...Cooling/heating selection switch, (30)...Voltage level adjustment means, (31)
... Voltage level detector, (32) ... Comparator, (3
3)...Reference voltage setter, <34)...Reference voltage level changer, (40)...Discrimination means.

Claims (1)

[Claims] (1) An air conditioner signal 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 a crossover wire (9). A transmission device, the remote control device (14)
) includes changeover switches (20), (21) for switching the operating state for indoor air conditioning into multiple modes, and a single crossover wire (9) depending on the switching state of the changeover switches (20), (21). ) and a voltage level changing means (30) for changing the voltage level (Vs) of the air conditioner main body (7).
The air conditioner is characterized in that it is equipped with a discriminating means (40) for detecting the voltage level (Vs) of the crossover wire (9) and discriminating the operation mode by the changeover switches (20) and (21). Machine signal transmission device.