JPH11182963A - Refrigerant heating type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency at heating operation by relatively simple constitution, in a refrigerant heating type air conditioner. SOLUTION: A refrigerant heating system of air conditioner is one capable of executing the cooling operation of circulating the refrigerant discharged from a compressor 11 via a four-way valve 12, a heat exchanger 13 on outdoor side, a capillary tube 18, a heat exchanger 4 on indoor side, and the four-way valve 12, and the heating operation of circulating it via the four-way valve 12, the heat exchanger 4 on indoor side, and a refrigerant heater 14 heated by a gas burner 36, and this is equipped with a power adjusting device which adjusts the power to be applied to a compressor motor, and an indoor microcomputer which controls this power adjusting device, and this indoor microcomputer drops the input of the compressor motor by the power adjusting device, at heating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant heating type air conditioner for heating a refrigerant by a heating means during a heating operation.

[0002]

2. Description of the Related Art A conventional air conditioner of this type, which is of a refrigerant heating type, is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-6372. That is, in this type of air conditioner, by switching the four-way switching valve, during the cooling operation, the refrigerant discharged from the compressor is cooled by the four-way switching valve, the outdoor heat exchanger, the on-off valve (or the check valve), and the pressure reduction. Return to the compressor through the heat exchanger, indoor heat exchanger, four-way switching valve, check valve, and at the time of heating operation, the refrigerant discharged from the compressor is switched to the four-way switching valve, indoor heat exchanger, another opening and closing. It is configured to return to the compressor through a refrigerant heater heated by the valve / burner.

[0003]

However, in this type of air conditioner of the refrigerant heating type, the load applied to the compressor during the heating operation is reduced. It is significantly reduced in comparison.

However, in the past, the compressor was operated at a constant speed during the heating operation as well as during the cooling operation, so that there was a problem that the efficiency of the air conditioner was deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to improve the efficiency in a heating operation of a refrigerant-heated air conditioner with a relatively simple configuration. It is the purpose.

[0006]

The refrigerant-heated air conditioner according to the present invention uses the refrigerant discharged from the compressor to change the flow path of the refrigerant, the outdoor heat exchanger, the pressure reducing device, the indoor heat exchanger, A cooling operation that circulates through the path switching means and a heating operation that circulates through the refrigerant heater heated by the flow path switching means, the indoor heat exchanger, and the heating means can be executed. There is provided a power adjusting means for adjusting the power applied to the compressor, and a control means for controlling the power adjusting means, and the control means controls the compressor by the power adjusting means during the heating operation. It reduces the input.

According to the present invention, in a refrigerant heating type air conditioner, a power supply adjusting means for adjusting the power applied to the compressor and a control means for controlling the power adjusting means are provided. Since the input of the compressor is reduced by the adjusting means, the efficiency of the entire apparatus at the time of the heating operation in which the compressor has a light load can be remarkably improved. In addition, since it is compatible with existing devices, it is also versatile.

According to a second aspect of the present invention, the power supply adjusting means comprises a thyristor, and the control means thins out a power supply waveform applied to the compressor by the thyristor during a heating operation. is there.

According to the second aspect of the present invention, in addition to the above, the power supply adjusting means is constituted by a thyristor, and in the heating operation, the power supply waveform applied to the compressor is thinned out by the thyristor. The input of the compressor can be reduced while suppressing the occurrence of energy loss and noise.

According to a third aspect of the present invention, there is provided a refrigerant heating type air conditioner, wherein the power supply adjusting means comprises a reactor.
The control means reduces the power supply voltage applied to the compressor by the reactor during the heating operation.

According to the third aspect of the present invention, in addition to the first aspect, the power supply adjusting means is provided with a reactor, and the power supply voltage applied to the compressor is reduced by the reactor during the heating operation. This makes it possible to reduce the input of the compressor.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of a refrigerant-heated air conditioner 1 of the present invention, FIG. 2 is an electric circuit diagram of an indoor unit 2 of the air conditioner 1, and FIG.

In FIG. 1, an air conditioner 1 includes an indoor unit 2 installed in a room to be air-conditioned and an outdoor unit 3 installed outdoors. The indoor unit 2 has a built-in slit fin type indoor heat exchanger 4 and a cross flow fan 6, and the cross flow fan 6 is driven by a fan motor 7. Reference numeral 8 denotes a room temperature sensor for detecting room temperature, and reference numeral 9 denotes a heat exchange temperature sensor for detecting the temperature of the indoor heat exchanger 4.

On the other hand, the outdoor unit 3 has a compressor 11 as a means for circulating a refrigerant and a four-way valve 1 as a flow path switching means.
2, an outdoor heat exchanger 13, a capillary tube 18 as a decompression device, a refrigerant heater 14, a burner section 16, and the like are installed, and the equipment in the outdoor unit 3 and the indoor unit 2
The internal devices are connected as shown in FIG. 1 by connecting refrigerant pipes 17A and 17B.

That is, the discharge side of the compressor 11 is connected to the outdoor heat exchanger 13 via a four-way valve 12 by piping, and the outdoor heat exchanger 13 is connected to the capillary tube 1 as a pressure reducing device.
8, connected to the indoor heat exchanger 4 via the check valve 19 and the refrigerant pipe 17A. The indoor heat exchanger 4 is connected to the suction side of the compressor 11 via the refrigerant pipe 17B, the four-way valve 12, the check valve 21, and the accumulator 22. still,
The check valve 19 has a forward direction on the indoor heat exchanger 4 side,
The check valve 21 is directed forward on the accumulator 22 side.

The inlet side of the refrigerant heater 14 is connected to the forward side of the check valve 19 via a two-way valve 23 as an on-off valve, and the outlet side is connected to the forward side of the check valve 21. It is connected. Further, a relief circuit 28 to which an orifice 27 is connected communicates between the refrigerant pipe 17B side of the four-way valve 12 and the forward direction side of the check valve 19.

Reference numeral 26 denotes a thermistor attached to a pipe on the discharge side of the compressor 11, and 31 denotes a thermistor attached to a pipe on the refrigerant pipe 17B side of the four-way valve 12.
2 is a thermistor attached to the outlet side of the refrigerant heater 14. Reference numeral 33 denotes a propeller fan that blows air to the outdoor heat exchanger 13, and is driven by an outdoor fan motor 34.

On the other hand, the burner section 16 is provided with a gas burner 36 as a heating means, a gas supply pipe 35 for supplying gas to the gas burner 36, and a gas supply pipe 35 interposed between the gas supply pipe 35 and supplied to the gas burner 36. Gas proportional valve 37 for adjusting the amount of gas supplied, two gas solenoid valves 38 and 39 and a gas main plug 41 provided for safety in the gas supply pipe 35 between the gas proportional valve 37 and the gas inlet, and the gas A combustion fan 42 for blowing the burner 36 and the combustion fan 42
And a burner motor 43 for driving the motor. The burner may be a kerosene burner.

The refrigerant heater 14 is installed at a position where it is heated by the gas burner 36. Incidentally, 44
Reference numerals 46 denote a temperature fuse for detecting the temperature of the refrigerant heater 14 and blowing it, and a bimetal switch for opening and closing. Further, the exhaust gas from the gas burner 36 is exhausted from an exhaust port 47.

In the cooling operation, the refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 from the four-way valve 12 as shown by the broken line arrow in the state where the four-way valve 12 is de-energized. Then, the pressure in the capillary tube 18 is reduced. Then, it flows into the indoor heat exchanger 4 via the check valve 19 and evaporates there to take heat from the surroundings to exert a cooling effect.

The cool air cooled by the indoor heat exchanger 4 is blown into the room by the cross flow fan 6 to perform cooling. The refrigerant that has exited the indoor heat exchanger 4 enters the accumulator 22 through the check valve 21 together with a part of the refrigerant that has passed through the orifice 27 of the relief circuit 28, where it is separated into gas and liquid, and only the gas refrigerant is compressed. Return to the machine 11.
In this case, the two-way valve 23 is closed.

On the other hand, during the heating operation, the four-way valve 12 is energized and switched, so that the refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 4 as indicated by the solid line arrow in the figure. The refrigerant flowing out of the indoor heat exchanger 4 flows into the refrigerant heater 14 via the open two-way valve 23.

The refrigerant flowing into the refrigerant heater 14 is heated by the gas burner 36 of the burner section 16. The refrigerant flowing out of the refrigerant heater 14 is stored in the accumulator 22.
And returns to the compressor 11. In this manner, the heating refrigerant is circulated through the indoor heat exchanger 4 to exert a heating effect. The warm air heated by the indoor heat exchanger 4 is blown into the room by the cross flow fan 6 to perform heating.

In this heating operation, the refrigerant discharged from the compressor 11 is not depressurized by the capillary tube 18. Therefore, the compressor 11 operates as a refrigerant circulating unit that only circulates the heated gas refrigerant. Therefore,
During the heating operation, the compressor 11 has a lighter load than during the cooling operation.

Next, in the electric circuit of the indoor unit 2 shown in FIG. 2, reference numeral 51 denotes an indoor microcomputer composed of a general-purpose microcomputer, and the indoor sensor 51 and the heat exchange sensor 9 are connected to the indoor microcomputer 51. Further, a board 52 provided with a setting switch, a display, a receiver from a remote controller, and the like is connected to the indoor microcomputer 51.

A driving circuit 53 is provided in the indoor microcomputer 51.
The flap motor 54 is connected via the. The flap motor 54 drives a flap (not shown) for adjusting the wind direction attached to the indoor unit 2. Furthermore,
The fan microcomputer 7 is connected to the indoor microcomputer 51 via a phase control circuit 56. Incidentally, 57 is a condenser for the fan motor. Therefore, the rotation speed of the fan motor 7 is controlled by the phase control circuit 56.

The power supplied from an outlet 58 connected to an AC power supply via a dual power switch 59 is supplied to these components via a filter 61, a step-down transformer 62, and DC constant voltage power supplies 63 and 64. Will be. One of the power switches 59 is connected to the first terminal of the terminal plate, and the other is directly connected to the third terminal of the terminal plate.

Further, the other end of the power switch 59 is connected to a second terminal of the terminal board via a power relay 66 and to a fourth terminal of the terminal board via a switch 67 for a four-way valve.

On the other hand, in the electric circuit of the outdoor unit 3 shown in FIG. 3, reference numeral 68 denotes a compressor motor for driving the compressor 11, which is connected to an overload relay 69 and a power supply adjusting device 70 as a power supply adjusting means. It is connected between the first and second terminals.

The power supply adjusting device 70 includes a compressor motor 68 and an overload relay 6 as shown in FIG.
9, a triac (two-way three-terminal thyristor) 70T connected in series with a phase control circuit 70C connected to the gate of the triac 70T. The phase control circuit 70C is connected to the indoor microcomputer 51.

The fan motor 34 is connected to the relay contact 7
1 is connected between the first and second terminals of the terminal board. An operation signal detection circuit 72 is further connected between the first and second terminals of the terminal board, and the output of the operation signal detection circuit 72 is input to an outdoor microcomputer 73 comprising a general-purpose microcomputer.

The four-way valve 12 is connected between the first and fourth terminals of the terminal plate. A cooling / heating signal detection circuit 76 is further connected between the first and fourth terminals of the terminal board,
The output of the cooling / heating signal detection circuit 76 is also input to the outdoor microcomputer 73.

A two-way valve 23 and a relay contact 78 are provided between the first and third terminals of the terminal plate via a filter 77.
, A series circuit of a burner motor 43 and a triac (bidirectional three-terminal thyristor) 79, a series circuit of an igniter 82 of the gas burner 36 and a relay contact 83, and a series circuit of a relay contact 84 and a full-wave rectifier circuit 86. Are connected in parallel.

A phase control circuit 94 connected to the outdoor microcomputer 73 is connected to the gate of the triac 79. Further, the gas electromagnetic valves 39 and 38 are connected in parallel to the output of the full-wave rectifier circuit 86, and a relay contact 87 is connected to the gas electromagnetic valve 38 in series.

The outdoor microcomputer 73 includes the thermistor 2
6, 31, and 32 are connected, and a display circuit 88 having an LED for displaying an error and the like is also connected. The outdoor microcomputer 73 is connected to the gas proportional valve 37 via a proportional valve drive circuit 89, and is provided with coils C for opening and closing the relay contacts 87, 84, 83, 78 and 71. The relay drive circuit 93 is also connected.

The outdoor microcomputer 73 is connected to a memory 91 composed of a readable and writable EEPROM storing data for gas switching, and also connected to a memory 92 composed of an EEPROM storing other data. . Note that the memory 92 may also be used as the memory 91. Further, a frame sensor circuit 97 having a frame rod 96 for detecting the flame of the gas burner 36 is connected to the outdoor microcomputer 73.

The power supplied to the coil C via the filter 77 is supplied via the power transformer 98, the DC constant voltage power supply 99, the temperature fuse 44 and the bimetal switch 46. Further, the DC constant voltage power supply 101 connected to the secondary side of the power transformer 98 serves as a power supply for the outdoor microcomputer 73 and the power transformer 98.
Also feeds the frame sensor circuit 97.

The first and second terminals of the terminal boards of the indoor unit 2 and the outdoor unit 3 are connected to the second and third terminals, the third and third terminals, and the fourth and fourth terminals. The terminals are connected to each other by internal / external connection lines 102 (FIG. 1).

The operation of the air conditioner 1 with the above configuration will be described. The power switch 59 is assumed to be closed, and when a cooling operation is instructed by the user on the board 52, the indoor microcomputer 51 opens the switch 67. Thereby, the four-way valve 1
2 is de-energized. Further, since no voltage appears in the cooling / heating signal detecting circuit 76, the outdoor microcomputer 73 recognizes the cooling operation based on the output, and opens the relay contact 78 to close the two-way valve 23. Thereby, the flow of the refrigerant becomes the flow at the time of the cooling operation described above.

In this state, the indoor microcomputer 51 closes the power relay 66 based on the output of the room temperature sensor 8 when the room temperature is higher than the set temperature. At the same time, the phase control circuit 70C
Triggers the triac 70T to start (ON) the compressor motor 68. In this cooling operation, the indoor microcomputer 51 triggers the triac 70T with a full wave,
The entire waveform of the AC power supply shown as the normal power supply waveform at the top of FIG. 5 is applied to the compressor motor 68.

The interior of the room is cooled by operating the cross flow fan 6 as described above. If the room temperature falls below the set temperature by this cooling operation, the indoor microcomputer 51 opens the power relay 66 based on the output of the room temperature sensor 8, and sets the triac 70T to the non-conducting state by the phase control circuit 70C so that the compressor motor 68 Is stopped (OFF). In this ON / OFF switching operation, a temperature differential or a time differential is provided to turn ON / OFF.
/ OFF chattering is prevented.

When the compressor motor 68 is started, a voltage also appears in the operation signal detection circuit 72.
3 drives the outdoor fan motor 34 by closing the relay contact 71 based on the output. The compressor motor 6
8 stops, no voltage appears in the operation signal detection circuit 72, and the outdoor microcomputer 73
Stops the outdoor fan mold 34.

When the room temperature rises again to the set temperature (there is a safe time of three minutes), the indoor microcomputer 51 closes the power relay 66 again, triggers the triac 70T with a full wave, and starts the compressor motor 68. The room is cooled to the set temperature by the cooling operation.

Next, when the user instructs the heating operation, the indoor microcomputer 51 closes the switch 67. Thereby, the four-way valve 12 is energized, and the flow of the refrigerant becomes the flow at the time of the heating operation described above. Further, since a voltage appears in the cooling / heating signal detection circuit 76, the outdoor microcomputer 73 recognizes the heating operation based on the output change, but the relay contact 78 is continuously opened and the two-way valve 23 is closed.

As a result, the refrigerant accumulated in the outdoor heat exchanger 13 is recovered to the suction side of the compressor 11 via the check valve 21 and the accumulator 22. That is, the outdoor microcomputer 73 executes the refrigerant recovery operation before starting the heating. Then, for example, after executing the refrigerant recovery operation for one minute, the two-way valve 23 is opened to flow the refrigerant to the refrigerant heater 14, and the following heating control is executed. At the same time, the counter as a function of the outdoor microcomputer 73 is reset.

In this heating control, the indoor microcomputer 51 closes the power relay 66 based on the output of the room temperature sensor 8 when the room temperature is lower than the set temperature (ie, lower limit temperature: for example, + 22 ° C.). At the same time, the triac 70T is triggered by the phase control circuit 70C to start (ON) the compressor motor 68.

In the heating operation, the indoor microcomputer 51 triggers the triac 70T with a full wave at the beginning of the operation and activates the compressor motor 68 as described above, and thereafter, the phase control circuit 70C causes the operation as shown in FIG. As shown in the drawing, the triac 70T is turned off at a constant cycle, and the compressor motor 6 is turned off.
The voltage applied to 8 is thinned out. As a result, the input of the compressor motor 68 decreases, but the load on the compressor 11 during the heating operation is reduced as described above, so that there is no problem in operation. Further, the efficiency of the entire apparatus is improved by reducing the input.

The thinning operation may be performed by adjusting the conduction ratio within a half cycle of the AC power supply as shown in FIG. 5 (2). In each of the above cases, the triac 7
A so-called zero-cross switching technique is used for the trigger of 0T.

Then, the indoor microcomputer 51 operates the cross flow fan 6 as described above. When the compressor 11 is started, a voltage also appears in the operation signal detection circuit 72. Based on the output change, the outdoor microcomputer 73 operates the respective relay contacts to open the gas solenoid valves 38 and 39, and also opens the gas proportional valve 37. Is opened to supply gas to the gas burner 36. In addition, the igniter 82 is energized to ignite the gas burner 36 (operation: ON), and the combustion fan 42 is operated by the burner motor 43 to blow air to the gas burner 36.

The amount of combustion in the gas burner 36 can be changed by adjusting the opening of the gas proportional valve 37 and the number of revolutions of the burner motor 43 under the control of the outdoor microcomputer 73. Usually, the amount of combustion is 100%. Be driven.

The heating of the refrigerant heater 14 is performed as described above, and the room is heated as described above. By this heating operation, the room temperature is the upper limit temperature of the set temperature + 1 ° C (+ 23 ° C).
The microcomputer 51 opens the power relay 66 based on the output of the room temperature sensor 8 and
Compressor motor 68 is stopped with T turned off (OFF)
I do. When the compressor motor 68 stops, no voltage appears in the operation signal detection circuit 72, and the output change causes the outdoor microcomputer 73 to close the gas solenoid valves 38 and 39 and extinguish the gas burner 36 (a state of pilot flame). (Combustion stop: OFF).

When the room temperature drops to the set temperature again (there is a safe time of three minutes), the indoor microcomputer 51 closes the power relay 66 again. Also, Triac 70
By triggering T, the compressor motor 68 is started to perform the thinning operation as described above. Then, based on the activation of the compressor motor 68, the outdoor microcomputer 73 ignites the gas burner 36 as described above. The room is heated to around the set temperature by such a heating operation.

When the temperature detected by the thermistor 32 becomes, for example, + 55 ° C. or more, the outdoor microcomputer 73 performs an operation of adjusting the gas proportional valve 37 and the burner motor 43 to reduce the combustion amount of the gas burner 36. , The temperature of the refrigerant is maintained at + 55 ° C.

In the above-described embodiment, the power supply adjusting device 70 is constituted by the triac 70T and the phase control circuit 70C, and the input control of the compressor motor 68 is performed by the conduction / non-conduction of the triac 70T, as shown in FIG. As described above, the power supply adjusting device 70 may be constituted by the changeover switch 70S and the reactor 70L.

During the cooling operation, the indoor microcomputer 51
6, the switch 70 is closed to the contact a side in FIG. 6, and during the heating operation, the switch 70 is closed to the contact b side to connect the reactor 70L between the compressor motor 68 and the AC power supply. Reactor 70L
Is connected, the input voltage to the compressor motor 68 drops from the unconnected state to about 70% (see FIG. 7).
Thus, the input of the compressor motor 68 is reduced.

[0056]

As described above in detail, according to the present invention, in a refrigerant heating type air conditioner, there are provided a power supply adjusting means for adjusting the power supply applied to the compressor and a control means for controlling the power supply adjusting means. In the heating operation, since the input of the compressor is reduced by the power supply adjusting means, the efficiency of the entire apparatus during the heating operation in which the compressor has a light load can be significantly improved. It is. Also,
Because it is compatible with existing devices, it is also versatile.

According to the second aspect of the present invention, in addition to the above, the power supply adjusting means is constituted by a thyristor, and in the heating operation, the power supply waveform applied to the compressor is thinned out by the thyristor. The input of the compressor can be reduced while suppressing the occurrence of energy loss and noise.

According to the third aspect of the present invention, in addition to the first aspect, the power supply adjusting means is provided with a reactor, and the power supply voltage applied to the compressor is reduced by the reactor during the heating operation. This makes it possible to reduce the input of the compressor.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigerant-heated air conditioner of the present invention.

FIG. 2 is an electric circuit diagram of an indoor unit of the refrigerant-heated air conditioner of the present invention.

FIG. 3 is an electric circuit diagram of an outdoor unit of the refrigerant-heated air conditioner of the present invention.

FIG. 4 is an enlarged view of an electric circuit around a compressor motor of the refrigerant-heated air conditioner of the present invention.

FIG. 5 is a diagram showing a waveform of an AC power supply applied to the compressor motor by the power supply adjusting device of FIG. 4;

FIG. 6 is an enlarged view of an electric circuit around a compressor motor of a refrigerant-heated air conditioner according to another embodiment of the present invention.

FIG. 7 is a diagram showing a waveform of an AC power supply applied to the compressor motor by the power supply adjusting device of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant heating air conditioner 2 Indoor unit 3 Outdoor unit 4 Indoor heat exchanger 11 Compressor 12 Four-way valve 13 Outdoor heat exchanger 14 Refrigerant heater 16 Burner part 23 Two-way valve 32 Thermistor 36 Gas burner 51 Indoor microcomputer 68 Compressor motor 70 Power supply regulator 70C Phase control circuit 70L Reactor 70S Changeover switch 70T Triac 73 Outdoor microcomputer

Claims (3)

[Claims] A cooling operation for circulating the refrigerant discharged from the compressor via a flow path switching means, an outdoor heat exchanger, a decompression device, an indoor heat exchanger, and the flow path switching means; In a refrigerant heating type air conditioner capable of performing a heating operation of circulating through a refrigerant heater heated by a flow path switching unit, the indoor side heat exchanger, and a heating unit, the refrigerant is applied to the compressor. Power adjusting means for adjusting the power supply, and control means for controlling the power adjusting means, wherein the control means reduces the input of the compressor by the power adjusting means during the heating operation. Refrigerant heating type air conditioner. 2. The refrigerant-heated air conditioner according to claim 1, wherein the power supply adjusting means comprises a thyristor, and the control means thins out a power supply waveform applied to the compressor by the thyristor during a heating operation. 3. The refrigerant-heated air conditioner according to claim 1, wherein the power supply adjusting means includes a reactor, and the control means reduces a power supply voltage applied to the compressor by the reactor during the heating operation.