JPS59112144A - Operation circuit for air conditioner - Google Patents

Abstract

PURPOSE:To eliminate the intricacies of resetting wiring by a method in which single operation of cooling and heating is made only by switching, and the selection of manual and automatic returning systems after the operation of a protector is made only by switching. CONSTITUTION:When a switch 13 is set to cooling side, if the room temperature is within the cooling temperature range, a cooling relay 18 becomes electrically energized, contact 40 is closed, a coil 5 for compressor becomes electrified, and cooling operation is started. When the switch 13 is set to heating side, if the room temperature is within the heating operation range, a relay 19 for heating becomes electrified, the contact 41 is closed, a coil 6 for electric heater becomes electrified, and heating operation is started. If the switch 13 is set to automatic side, the operations of cooling, heating and stoppage are made according to the condition of room temperature.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention enables selection of cooling/heating and automatic cooling/heating operation for an air conditioner, and also automatically restores a return method after activation of a protection device of the air conditioner. The present invention relates to an operation circuit for an air conditioner having a changeover switch that can be changed to either automatic return or automatic return.

[Prior art]

Conventional circuits include a manual reset circuit that does not restart even if the protective device 3 is activated and returns to normal operation unless the operation switch 1 is used to manually reset the circuit; There is also an automatic recovery circuit that automatically restarts the circuit system.

FIG. 1 shows an example of a manual return circuit, and FIG. 3 shows an example of an automatic return circuit.

In the case of the manual reset circuit shown in FIG. 1, the sequence of operations after the protective device 3 is activated is as follows.

1. The protection device 3 is activated and the coil of the auxiliary relay 20 is de-energized.

2. When the coil of the auxiliary relay 20 is de-energized, the a contact 21 of the auxiliary relay 20 is disconnected.

3. When the a contact 21 of the auxiliary relay 20 is disconnected, the compressor coil 5 is de-energized and the cooling operation of the compressor is stopped.

4. Refrigeration cycle protection device 3 due to compressor stoppage
Even if the cause of the activation is removed and the protective device 3 is restored,
Since the a contact 21 of the auxiliary relay 20 is broken, the compressor coil 5 does not return to the energized state, and the cooling operation remains stopped.

5. Once the rotary switch 22 is returned from the C00L position to the FAN or OFF state, the auxiliary relay 20 is energized through the wiring A23, and the a contact 21 of the auxiliary relay 20 is restored. Then rotary switch 2
2 to the C00L position, the compressor coil 5 is not energized and the cooling operation is restarted.

In this way, a circuit in which the cooling/heating operation is restarted only when a person operates the rotary switch 22 after the protection device 3 is activated is called an automatic recovery circuit.

In the case of the automatic recovery circuit shown in FIG. 3, the sequence of operations after the protection device 3 is activated is as follows. The explanation will be based on the state of cooling operation.

The circuit is operated by turning the 0N-OFF switch of operation switch 1'
When set to N, the indoor fan coil 4 is not energized.
If the temperature sensed by the thermostat of the operation switch 1' is within the cooling operation range, the timer 9 is energized and after a certain period of time,
The time-limited a contact of the timer 9 is turned on, the compressor coil 5 is energized, and cooling operation is performed.

1. The protection device 3 is activated, the compressor coil 5 is de-energized, and the cooling operation is stopped.

2. When the compressor stops, the refrigeration cycle protection device 3
When the cause of the operation is removed and the protective device 3 is restored,
Depending on the time set on the timer, there will be a difference in the time when the compressor coil 5 is energized, but after a certain period of time has passed, the compressor coil 5 will automatically become energized and start cooling operation again. do.

A circuit that automatically restarts the cooling or heating operation after the protection device 3 is activated without any human intervention is called an automatic recovery circuit.

Conventionally, either a manual return method or an automatic return method has been required depending on the air conditioning environmental conditions and customer requests, depending on each individual situation. In conventional circuits, when switching from a manual return method to an automatic return method or from an automatic return method to a manual return method, it is not only necessary to change the mechanism of the operation switches 1 and 1', but also to change the relay 8 and the circuit, etc. It was necessary to change the entire system. In such a case,
There were various drawbacks, such as the high price due to the addition of parts that were different from the standard product, and the occurrence of incorrect wiring accidents due to modification of the circuit system. Furthermore, there was a need for an automatic heating/cooling circuit that could control the room temperature and automatically perform cooling and heating during the day, and even in that case, there were various drawbacks, such as the need to change the circuit system.

FIG. 2 shows an example in which the manual return circuit shown in FIG. 1 is changed to an automatic cooling/heating operation circuit. The thermostat is a two-stage thermostat, with the L side used for cooling and the L side used for heating. The order of its operation will be explained.

1. Set the rotary switch 22 to C00T or HF)
When set to the AT position, when the room temperature is relatively high and cooling operation is started, the L side of the thermostat 2' is set to COOT,
cooling operation starts when the auxiliary relay 8 is turned on, the a contact 21' of the auxiliary relay 8 is turned on, and the compressor coil 5 is turned on.

2. After that, when the room temperature drops to 9, and the L side of the thermostat 2' is removed from the C00L side, the auxiliary relay 8 is de-energized, the compressor coil is also de-energized, and the cooling operation is stopped.

3. The room temperature drops further and thermostat 2' changes to HE.
When it enters the AT side, the auxiliary relay 8'' becomes energized, the a contact 21'' of the auxiliary relay 8'' is turned on, and the four-way valve coil 24
The compressor coil 5 becomes energized and starts heating operation.

4. After that, if the room temperature rises, the heating operation will stop.

A circuit that automatically repeats cooling and heating operations as the room temperature rises and falls is called an automatic heating and cooling operation circuit. In this case as well, change the room thermostat from stage 1 thermostat 2 to stage 2.
In addition to changing to a stage thermostat 2', it was necessary to change the wiring of the circuit system of the 8-circuit relay, which had drawbacks such as increased product cost and complicated wiring modifications.

[Purpose of the invention]

The purpose of the present invention is to enable independent operation of ventilation, air conditioning, and heating with compact functions, and to
To provide an operation circuit for an air conditioner that can perform automatic cooling/heating operation by switching, and can also select a manual return method or an automatic return method as a return method after activation of a protective device by switching a changeover switch 12. It is in.

[Summary of the invention]

Independent cooling/heating operation and automatic cooling/heating operation can be performed by simply switching a switch, and the manual reset method or automatic reset method can be selected by simply switching a switch after the protective device is activated. In order to keep it compact, all operating circuits were low voltage (24V) circuits, and the idea was to use only electronic circuits for control. The electronic circuit is a combination of a Philips 70 tube circuit, a comparator (Z) circuit, a diode, a transistor, and a relay.

[Embodiments of the invention]

The circuit side of the present invention will be explained using FIGS. 6 and 87. This circuit uses a refrigeration cycle for cooling and an electric heater for heating.
A protection device 3 is arranged in parallel with the protection device 3, and an auxiliary relay 8 is connected to the ground side of the protection device 3. Also, a power source C48 for the electric heater coil 6 is supplied. Energization control to the indoor circulation fan motor coil 4, compressor coil 5, and electric heater coil 6 is performed using the indoor blower relay 1 as a control contact for all coils.
This is done by arranging the A contact 39 of No. 7 as the compressor coil control contact, the A contact 40 of the cooling relay as the coil control contact for the compressor, and the A contact 41 of the heating relay as the electric heater coil control contact. On the other hand, indoor blower relay 17,
The cooling relay 18 and the heating relay 19 are powered by power source C.
48 is rectified by a rectifier circuit, and is supplied by a power source A46 and a power source B47.

A control system for the indoor blower relay 17, the cooling relay 18, and the heating relay 19 will be described next. the system,
These are a start switch 11, an automatic return/manual return changeover switch 12, and a cooling/air blowing/heating/automatic operation changeover switch 13. Black box circuit A27, AND circuit 42, detects room temperature with sensor and sets -18 to υ for cooling.
A cooling thermistor circuit 37 that controls the room temperature, a heating thermistor circuit 38 that also detects the room temperature and controls the heating relay 19, and are configured by a combination of resistors, capacitors, diodes, and transistors. The black box circuit A27 is composed of three or more input signals and one or more output signals; for example, a case of four input signals and one output signal is shown. The input signals include: 1. D signal 28 which is the power supply side input signal 2. R signal 2 which is the OFF side signal of the start switch 11
9 3. C signal 30 which is the signal on the ON side of the start switch 11 4. S signal 31 which is the signal on the automatic side 36 of the changeover switch 12 for automatic return and manual return 31 Output signals include: 1. Cooling, ventilation, heating , the relationship between the input signal and the output signal is shown in Table 1.゛Choice switch 12 is set to “manual”
The pattern when the changeover switch 12 is in the "auto" position 36 is designated as pattern 1, and the pattern when it is in the "auto" position 36 is designated as pattern 2. In the following explanation, it is assumed that when the signal is "1", a voltage signal is superimposed on the input or output side signal, and when it is "0", a voltage signal is not superimposed on the signal.

In the case of pattern (manual return) 1, the conditions will be explained in steps 1 to 3.

1. Step 1 (Protective device 3 is normal, start switch 1
1 from OFF to ON), before...
When in the OFF position, after... When in the ON position, "
In the previous state, the D signal 28 and R signal 29 are 1, and the C
If signal 30 and S signal 31 are 0, then C signal 3
2 becomes 0.

In the “after” state, the D signal 28 and C signal 30 are 1, the R signal 429.8 signal 31 is 0, υ, and the Q
Signals 3 and 2 are).

2. Step 2 (The state in which the protective device 3 is activated is defined as "before," and the state in which the protective device 3 is restored is defined as "after.") In the "front" state, the power is turned off, so all signals are It becomes 0.

° In the "after" state, the D signal 28 and C signal 30 are 1,
The R signal 29 and the S signal 31 are 0.The C signal 3 at that time
2 becomes 0.

3. Step 3 (With the protective device 3 restored, position 34 of the start switch 11 or ON is defined as "front", and position 33 of the start switch 11 is OFF is defined as "rear") When in the "front" state, The D signal 28 and C signal 30 are 1, and the R
Signal 29 and S signal 31 are 0, and C signal 3 at that time
2 is counted as 0.

In the “back” state, the D signal 28 and R signal 29 are 1,
The C signal 30 and the S signal 31 are 0, and the C signal 32 at that time is 0.

Next, the conditions for pattern (automatic return) 2 will be explained in steps 4 to 6.

4. Step 4 (Protective device 3 is normal, start switch 1
When switching 1 from OFF to ON) "Previous"...
・When in the OFF position, 'rear'...When in the ON position, in the 'front' state, the D signal 28 and R signal 29 are 1,
C signal 3 at that time when C signal 30 and S signal 31 are 0
2 becomes 0.

In the "back" state, the D signal 28, C signal 30, and S signal 31 are 1, and the R signal 29 is 0. At that time, the C signal 32 becomes 1.

5. Step 5 (The state in which the protective device 3 is normal is "before" and the state in which the protective device 3 is activated is "after") When in the "before" state, D signal 28, C signal 30, S signal 3
If 1 is 1, the R signal 29 is 0.

At that time, the C signal 32 becomes 1.

In the "after" state, the protection device 3 is activated and all signals are zero.

6. Step 6 (start switch 11 is in ON position)
1 When the return type changeover switch 12 is on the automatic return side 36, 'front' indicates when the protective device 3 is activated, and 'rear' indicates when the protective device 3 has returned). In the "after" state in which all signals are 0, the D signal 28, C signal 30, and S signal 31 are 1.
Yes, the R signal 29 is 0, and the C signal 32 at that time
becomes 1.

The black box circuit A2 is a circuit that outputs an output signal (C signal 32) as shown in Table 1 according to the values of such human input signals (D signal 28, R signal 29, C signal 30, S signal 31).
It is 7.

The cooling thermistor circuit Z37 connects the room temperature to the thermistor 16.
When the air conditioner temperature is within the cooling temperature range and the selector switch 13 is in the cooling or automatic position, the cooling relay 1 is activated.
The circuit is such that the cooling relay 18 is de-energized when the temperature is outside the cooling temperature range, so that the cooling relay 18 is energized.

The heating thermistor circuit Y38 connects the room temperature to the thermistor 16.
When the temperature is within the heating temperature range and the selector switch 13 is in the heating or automatic position, the heating relay 19 is energized; when the temperature is outside the slow release temperature range, the heating relay 19 is deactivated. The circuit is such that it is energized.

Output signal of black box circuit A27 (C signal 32)
is 1, and the circuit energizes the blower relay 17 when the changeover switch 13 is on.

Next, we will explain the operation of the entire system.

1. Operation a in the state of pattern 1 when the changeover switch 12 is in the "manual" position 35. When the power supply 25 is turned on and the protective device 3 is in a normal state, when the start switch 1) is turned on, from the operation clothes in step 1,
When the Q signal becomes 1, the coil of the blower relay 17 is energized, the a contact 39 is closed, and the indoor blower coil 4 is energized), and the indoor blower operates. At that time, the changeover switch 13 is set to the cooling side. When the set temperature is set and the room temperature is within the cooling temperature range, the cooling relay 18 becomes energized and its a contact 40 closes, so the compressor coil 5 becomes energized.
Start cooling operation. When the changeover switch 13 is set to the heating side and the room temperature is within the heating operation range, the heating relay 19 is energized and its a contact 41 is closed, so the electric heater coil 6 is energized and the heating operation is started. Start. If the changeover switch is set to the automatic side, cooling operation, heating operation, or operation stop will be performed depending on the room temperature. The following explanation will be made only regarding the cooling operation.

b. When the protective device 3 is activated, the power supply ■～◎ becomes 0,
All signals are set to 0 and operation is stopped. This is the operation of step 2.

C0 Next, the protective device 3 returns to normal, and the power supply ■～◎ becomes 1.
The case is “after” step 3.

In this case as well, the output signal (Q signal 32) remains at 0 and the cooling operation does not restart.

In order to start the cooling operation, the starting switch 11 is once returned to the OFF position 33 and the cooling operation will not be restarted unless it is set to the ON position 34 again.This circuit is a manual return circuit.

2. Operation in the state of pattern 2 in which the selector switch 12 is in the "auto" position 36 This explanation will also be made according to the cooling operation.

a. When you turn on the start switch 11 with the power supply 35 gold coins inserted and the protective device 3 in normal condition, the operation in step 4 will occur.
When the signal is 1, the coil of the blower relay 17 is energized. As a result, the a contact 39 of the blower relay is closed, the indoor blower coil 4 is not energized, and the indoor blower is operated.At this time, the selector switch 13 is set to the cooling side, and the room temperature is within the cooling temperature range. If available, cooling relay 1
8 is not energized and its a contact 40 is closed, so the compressor coil 5 is energized and starts cooling operation.

b. When the protective device 3 is activated, the power supply ■～■ becomes 0,
All signals are set to 0 and operation is stopped. This is the operation of step 5.

C0 Next, the protective device 3 returns to normal, and the power supply ■～◎ becomes 1.
The case is "after the step 6".

In this case, the output signal (Q signal 32) becomes 1, the blower relay 17 and the cooling relay 18 are energized, and the operation is restarted.

This circuit is an automatic return circuit.

In this way, by changing the changeover switch 12, the return method after the protection device is activated can be set to two types: "automatic return" and "manual return".
The sixth circuit system is a circuit system that can be selected as a switch, and at the same time, in combination with the selector switch 13, can perform 'independent operation of cooling, ventilation, and heating' and 'automatic operation of cooling and heating.' An example in which the circuit shown in the figure is applied to a more specific example is shown in FIGS. 5 and 4. A black box circuit A27 is made using the clip flock circuit 15. An example of the cooling thermistor circuit Z37 is shown as a thermistor circuit Z37'.

This circuit consists of an amplifier circuit, a resistor, and a capacitor.

The example shown in FIGS. 4 and 5 is one of the concrete application examples similar to the example shown in FIG.

This operation will be briefly explained below.

The automatic reset type protection device 3 is placed on the high voltage side, and the transformer 1
0, the secondary side voltage is set to a low voltage of 24V. Indoor blower coil 4, compressor 5, relay coil 8,
Timer coil 9 and electric heater coil 6 are all 24
It is for V.

IC is a solid flop circuit) 5, and circuit Z is a comparator circuit. The AC 24V power supply is rectified by a diode to υDC 24V, IOV, and the electronic circuit is
It uses a DC power supply.

Turn on the starting switch 11 and turn on the stain source. That is, when the start switch 11 is set to ON and the changeover switch 12 is set to manual, the signal Q32 becomes 1. As a result, the transistors Q and Q operate, the operation lamp 14 lights up, and the relay Y, 18 operates and sends a cooling signal to terminal F. On the other hand, when the selector switch 13 is set to heating, the relays YH and 19 operate and output a heating signal to the terminal H when the room temperature is within the heating temperature range. The operation when the protection device 3 is activated while the changeover switch 12 is set to manual is as follows.

At one end, when the input signal at the C terminal of the circuit C is cut off, this flip-flop circuit 15 turns the start switch 11 OFF once.
F, and the transistors Q and Q do not operate unless a signal is input again to the C terminal of the IC. In other words, this is a manual reset method, but if the selector switch 12 is set to automatic, after the protection circuit 3 is reset, a signal is input to the S terminal of the IC, and the transistor Q circuit is activated. , Q operates, relay YF17
．． 1. ) Relay Yc118, relay YH, 19, etc. are the circuits in which the relay operates. This is an automatic return method. Also, when the changeover switch 13 is set to automatic, the thermistor 16, cooling relay Y18, heating relay Y4, etc. are activated depending on the room temperature. The circuit operates the +I9 alternately to automatically operate cooling and heating.

According to this embodiment, not only can the return method be changed to manual return or automatic return by simply switching the selector switch 12,
By switching the changeover switch 13, cooling, heating, automatic cooling/heating operation, etc. can be easily performed.

〔Effect of the invention〕

According to the present invention: 1. Each operation of air blowing, cooling, heating, and automatic cooling/heating operation can be performed by switching a switch.

2. By changing the switch, you can select the return method after the protective device is activated, either manual or automatic return.

3. Since it uses a low voltage circuit, there is no need to worry about electric shock.

4. The switch for selecting the recovery method after the protection device is activated and the switch for selecting the operation can be placed in one remote control box, making the control unit compact.

5. Since an electronic circuit is used for the control device, the price can be lower than that of conventional products.

6. Products can be standardized without the need for circuit changes as in the past, even for specifications such as manual or automatic return after protection device activation, or automatic cooling/heating operation.

7. Since no circuit changes are required, accidents such as incorrect wiring are eliminated.

There are effects such as

[Brief explanation of the drawing]

FIG. 1 shows an example of a conventional manual return operation circuit, and FIG. 2 shows a circuit in which the circuit in FIG. 1 is changed to an automatic cooling/heating operation circuit. FIG. 3 is an example of a conventional automatic return type operating circuit. FIG. 4 shows an example of the operating circuit of the present invention, and FIG.
This is an example of a circuit diagram of a portion corresponding to the operation switch 1'' in the operation circuit of FIG. 4. FIG. 6 is a circuit diagram of the present invention, and FIG. 7 is an operation pattern diagram. ”・
・・Operation switch 2, 2′・・Thermostat
3...Protective device 4...Indoor blower coil
5... Coil for compressor 6... Coil for electric heater 7... Coil for outdoor blower 8゜8', 8
”...Relay 9...Timer 10...Transformer 11...Start switch 12...Auto return/manual return changeover switch 13...Cooling/ventilation/heating and automatic changeover switch 14...・Operation lamp 15...Flip-flop circuit 16・
... Thermistor 17 ... Indoor blower relay 18
...Cooling relay 19...Heating relay 20.
...Auxiliary relay 21...Auxiliary relay a contact 22.
...Rotary switch 23...Wiring A24...
・Four-way valve 25... AC power supply 26... Rectifier circuit 27... Black box circuit 28...
D signal 29...R signal 30...C signal
31...S signal 32...Q signal 33...
Of"F position 34...ON position 35...'
°Manual” position 36...“Auto” position 37...Cooling thermistor circuit 38...Heating thermistor circuit 39...Indoor blower relay a contact 40.
...Cooling relay a contact 41...Heating relay a
Contact 42...AND circuit 43...Resistance 44
...Capacitor 45...Diode 46.
...Power supply A 47...Power supply B 48...Power supply C 1 to 2 to 3n

Claims (1)

[Claims] In air conditioners that have operating circuit parts such as electromagnetic contactors for compressors, electromagnetic switches for blowers, timers, relays, and protective devices such as high and low pressure switches, and perform cooling operation, heating operation, or automatic cooling/heating operation. In addition to using automatic reset components in the protection device and lowering the voltage in the operating circuit, the combination of 7 lip-flop circuit C1 relays, diodes, and thermistors allows for various operations such as cooling, air blowing, heating, and automatic cooling/heating operation. The operation of an air conditioner is characterized in that the temperature can be controlled by a thermistor, and the automatic return method or manual return method can be easily selected as a return method after the protection device is activated using a changeover switch. circuit.