JPS5850193Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of a control circuit for an air conditioner, and its purpose is to simplify the control circuit for a heat pump air-conditioning device.

Fig. 1 is a diagram showing the basic configuration of a separate heat pump cooling system, in which 1 is an indoor unit, 2 is an outdoor unit, 3 is a compressor, 4 is a four-way valve that switches the direction of refrigerant, and 5
is an outdoor heat exchanger (evaporator for heating, condenser for cooling),
6 is a fan motor for the outdoor heat exchanger, 7 is a heating throttle valve,
8 is a check valve for cooling.

9 is an indoor heat exchanger (condenser for heating, evaporator for cooling)
, 10 is a fan motor for an indoor heat exchanger, 11 is a cooling throttle valve, 12 is a heating check valve, and 13 is an auxiliary heater for heating.

14 is an indoor temperature sensor installed at the air intake port of the indoor unit, 15 is an outdoor temperature sensor installed at the air intake port of the outdoor unit, and 16 is used to control the compressor 3 and outdoor fan motor 6 based on the outputs of these temperature sensors. , a controller that controls the indoor fan motor 10 and the auxiliary heater 13.

The figure shows cooling, but during heating, the compressor 3
The refrigerant that comes out passes through the four-way valve 4, condenses in the indoor heat exchanger 9, passes through the heating check valve 12, is depressurized by the heating throttle valve 7, evaporates in the outdoor heat exchanger 5, and then passes through the four-way valve 4. It passes through and returns to compressor 3.

The indoor temperature detector 14 and the outdoor temperature sensor 15 detect the temperature of the indoor air and outdoor air sucked in by the indoor fan motor 10 and the outdoor fan motor 6, and send the output to the controller 16, which controls the compressor 3 and the outdoor air. fan motor 6
, indoor fan motor] O and auxiliary heater 13.
Control off.

By the way, multiple controlled loads (compressor 3
, an outdoor fan motor 6, an indoor fan motor 10, and an auxiliary heater 13), a control circuit for controlling the plurality of loads is provided independently for each load, and each control circuit A dedicated air conditioning/heating switch was installed separately.

This not only complicates the circuit configuration, but also generates induction noise due to the opening and closing of a large number of heating/cooling changeover switches, which may adversely affect the operation of the control circuit.

In view of this point, the present invention is intended to rationally unify and simplify these control circuits.

An embodiment of the invention will be described with reference to FIG.

The figure shows a specific configuration of the controller 16 shown in FIG.

17 is a DC power supply for the control circuit, and 18 is its power switch.

Reference numeral 19 denotes an air conditioning/heating changeover switch, which has a heating contact a and a cooling contact A, and the figure shows the heating contact a closed.

21 is an indoor thermistor, 22 is an outdoor thermistor, and the first
This corresponds to the indoor temperature sensor 14 and the outdoor temperature sensor 15 in the figure, respectively.

23A is a heating temperature detection circuit for the compressor that operates based on the signal detected by the indoor thermistor 21, 24A is a cooling temperature detection circuit, and 25A is a compressor relay circuit that opens and closes the relay contact 26A of the compressor 3 according to its output. It is.

23 B is an auxiliary heater heating temperature detection circuit operated by a signal detected by the indoor thermistor 21;
B is connected to the relay contact 26 of the auxiliary heater 13 by its output.
This is an auxiliary heater relay circuit that opens and closes B.

23C is a heating temperature detection circuit for an outdoor fan motor operated by a signal detected by the outdoor thermistor 22;
24C is a cooling temperature detection circuit that controls the outdoor fan motor 6 during cooling, and 25C is an outdoor fan motor relay circuit that opens and closes the relay contact 26C of the outdoor fan motor 6 according to its output.

23D is a heating temperature detection circuit that controls the indoor fan motor 10 during heating, and 25D is an indoor fan motor relay circuit that opens and closes the relay contact 26D of the indoor fan motor 10 according to its output.

27 and 28 are resistors that set the signal voltages of the thermistors 21 and 22, and 20 is an AC power source.

In the above configuration, the plurality of heating temperature detection circuits 2
3A to 23D are supplied with the voltage of the DC power supply 17 through the heating contact a of the changeover switch 19, and the same cooling temperature detection circuits 24A and 24C are supplied with the voltage of the DC power supply through the cooling contact of the changeover switch 19. 17 voltage is supplied, and the relay circuits 25A to 25D are directly connected to the DC power supply 17.

Next, its effect will be explained.

During heating, when the changeover switch 19 closes the heating contact a, the heating temperature detection circuits 23A, 23B, 23
The voltage of the DC power supply 17 is applied to C and 23D, and the output causes relay circuits 25A, 25B, 25C and 25D.
through relay contact 26A.

26B, 26C, and 26D are closed, and the compressor 3, auxiliary heater 13, outdoor fan motor 6, and indoor fan motor 10 are driven.

When the indoor temperature rises to a predetermined temperature and the indoor thermistor 21 detects this, the heating temperature detection circuits 23A and 23B turn off the compressor 3 and the auxiliary heater 13 or one of them at the same time, so that the room temperature reaches the predetermined temperature. Turn these back on when they drop.

The heating temperature detection circuit 23C activates the relay circuit 2 when the outdoor temperature detected by the outdoor thermistor 22 is below a predetermined value.
The outdoor fan motor 6 is rotated at high speed via 5C to increase the capacity of the outdoor heat exchanger 5.

The heating temperature detection circuit 23D starts driving the indoor fan motor 10 after the temperature of the indoor heat exchanger 9 rises to a certain temperature to prevent a cold draft from occurring indoors.

During cooling, the selector switch 19 is switched to the cooling contact, the compressor 3 and the outdoor fan motor 6 are controlled by the cooling temperature detection circuits 24A and 24C, and the indoor fan motor 10 is constantly driven.

FIG. 3 shows a specific example of the control circuit for the compressor 3 in FIG. 2. In FIG.

In the figure, 29 is a variable resistor for heating temperature setting;
31 and 32 are voltage comparators for heating and cooling, the voltage comparator 31 has a reference voltage determined by the variable resistor 29 and the resistor 33, and the voltage comparator 32 has a variable resistor. A reference voltage defined by resistor 30 and resistor 34 is connected to each positive input terminal, and a signal voltage P detected by indoor thermistor 21 and resistor 27 is connected to each negative input terminal.

When the changeover switch 19 closes the heating contact a and the indoor temperature is lower than a predetermined temperature, the resistance of the indoor thermistor 21 is high and the signal voltage P is low, and the negative input voltage of the voltage comparator 31 becomes positive. The output of the voltage comparator 31 becomes high, and the base current flows into the transistor 36 through the diode 35.

The relay coil 37 of the relay circuit 25A is excited by the conduction of the transistor 36, which closes the relay contact 26A and drives the compressor 3.

When the indoor temperature is higher than a predetermined temperature, the voltage comparator 31
The output becomes low, the voltage determined by resistors 38 and 39 makes transistor 36 non-conductive, and relay coil 37 opens relay contact 26A to stop compressor 3.

When the changeover switch 19 closes the cooling contact, the output of the voltage comparator 32 is passed through the resistor 40 to the transistor 4.
1 and controls the on/off of the transistor 41 together with the voltage of the resistor 42, and the collector current of the transistor 41 is applied to the base of the transistor 36 through the diode 43.
The compressor 3 is controlled in the same way as during heating, depending on whether or not the air is supplied to the base.

As described above, the present invention includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an indoor fan motor, an outdoor fan motor, an auxiliary heater, an indoor temperature detector, an outdoor temperature detector, and a controller. In the heat pump air conditioning system, the controller controls the compressor, the indoor fan motor, the outdoor fan motor, and the auxiliary heater according to the outputs of the indoor and outdoor temperature sensors.
) A heating temperature detection circuit 23A and a cooling temperature detection circuit 24A for controlling the compressor that operate based on the signal from the indoor temperature sensor, and a compressor relay circuit 25A that operates based on the outputs thereof; (2) a signal from the indoor temperature sensor; (3) heating temperature detection circuit 23C for controlling the outdoor fan motor, which operates according to the signal from the outdoor temperature sensor;
1 and the cooling temperature detection circuit 24C as well as the outdoor fan motor relay circuit 25C which is operated by these outputs.
1(4) A heating temperature detection circuit 23D that controls the indoor fan motor during heating and an indoor fan motor relay circuit 25D that operates based on its output, including the plurality of heating temperature detection circuits 23A to 23D and the cooling temperature detection circuit 24.
Voltage is supplied to A and 24C from a common DC power supply 17 by one changeover switch 19, and the relay circuit 25
Since the voltage of the DC power supply 17 is directly applied to A to 25D, the following effects can be obtained.

By using a bridge circuit that detects the indoor temperature, there is no need for any switching circuit elements from the voltage comparator to the transistor for driving the relay, and the output of the temperature sensor can be directly connected to the relay circuit using an OR circuit. This simplifies the circuit.

Therefore, even if there are multiple loads or multiple temperature detection circuits, only one air conditioning/heating selector switch is required, and
Since a changeover switch is not required in the input circuit of the voltage comparator of the temperature detection circuit, there is no induction noise and operation is ensured.

Furthermore, the configuration can be configured by switching only the base current supply circuit of the relay drive transistor without having to separate the shared circuit for air conditioning and the dedicated circuit for air conditioning, which simplifies the overall circuit configuration. It has many advantages.

[Brief explanation of drawings]

Figure 1: Diagram showing the overall configuration of a heat pump air conditioning system to which the present invention is applied, Figure 2: Block diagram showing the configuration of the present invention, Figure 3: One embodiment of a specific circuit of the present invention. . 3...Compressor, 6...Outdoor fan motor, 10...Indoor fan motor, 13...
... Auxiliary heater, 14 ... Indoor temperature sensor, 1
5...Outdoor temperature detector, 16...Controller, 17...DC power supply, 19...Selector switch, 21...Indoor Thermistor, 22...
...Outdoor thermistor, 23A to 23D...
Heating temperature detection circuit, 24A, 24C...Cooling temperature detection circuit, 25A-25D...Relay circuit, 26A-26D...Relay contact.

Claims (1)

[Scope of utility model registration request] The controller includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve indoor fan motor, an outdoor fan motor, an auxiliary heater, an indoor temperature sensor, an outdoor temperature sensor, and a controller, the controller controlling the indoor and outdoor temperatures. In a heat pump air-conditioning system that controls the compressor, indoor fan motor, outdoor fan motor, and auxiliary heater by the output of the detector, the controller includes (1) a heating unit for controlling the compressor that is operated by the signal from the room temperature detector; Temperature detection circuit 23A
and a cooling temperature detection circuit 24A and a relay circuit 25A for the compressor operated by the outputs thereof; (2) a heating temperature detection circuit 23B for the auxiliary heater operated by the signal of the indoor temperature sensor and an auxiliary heater operated by the output thereof; Relay circuit 25B, (3) heating temperature detection circuit 23C1 and cooling temperature detection circuit 24C for controlling the outdoor fan motor operated by the signal from the outdoor temperature detector.
and an outdoor fan motor relay circuit 25 operated by these outputs. C1 (4) A heating temperature detection circuit 23D that controls the indoor fan motor during heating, and an indoor fan motor relay circuit 25D that operates based on the output thereof, and a common heating temperature detection circuit and a cooling temperature detection circuit. An air conditioner characterized in that a voltage is supplied from a DC power supply by one changeover switch, and the voltage of the DC power supply is directly applied to the plurality of relay circuits.