JPH07101122B2 - Air conditioner control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner that heats a heat medium by combustion to convey the heat and heat the heat medium.

2. Description of the Related Art A heat pump air conditioner has been generally put into practical use as a device for heating and cooling by connecting indoor and outdoor units with a refrigerant pipe. However, in the case of the heat pump air conditioner, there is a problem that the capacity is reduced at the time of low outside air temperature where heating is required most, and high-temperature strong wind cannot be blown out.

As a means for solving such a problem, for example, JP-A-63-
There is a publication system of 99467. That is, in FIG. 4, during heating operation, first, the first solenoid valve 1,
The second solenoid valve 2 and the opening / closing valve 3 are closed, and the third solenoid valve 4,
The fourth solenoid valve 5 is opened to operate the compressor 6. Since the refrigerant path is sealed by the action of the first solenoid valve and the second check valve 7, the refrigerant distributed in the outdoor refrigerant condenser 8, the accumulator 9 and various refrigerant pipes connecting them is compressed. The suction pump is downed by the operation of the machine 6, and all the refrigerant is pumped up to the refrigerant heater 11 via the first check 10. After this pump down operation, the compressor 6 is stopped, the fourth solenoid valve 5 is closed, and a burner (not shown)
Ignite to start heating operation. The heat medium pumped up to the refrigerant heater 11 is heated by the burner and evaporates to increase the evaporation pressure, and the evaporated high-temperature and high-pressure refrigerant gas flows from the refrigerant heater 11 to the third solenoid valve 4 and the refrigerant pipe 12. It is pumped to the indoor heat exchanger 13. At this time, when the indoor fan 14 is operated, the high-temperature and high-pressure refrigerant gas radiates heat and is heated to condense and liquefy. Refrigerant liquid is the third from the refrigerant pipe 15
After passing through the check valve 16, the liquid flows into the liquid receiver 17 and is received. When the liquid level of the received liquid reaches a certain level, the on-off valve 3 is opened, and the evaporation pressure is applied to the liquid receiver 17, and the static pressure becomes the same as that of the refrigerant heater 11. The refrigerant liquid in the liquid receiver 17 flows into the cooler / heater 11 due to the surface head differential pressure.
After the liquid level of the liquid receiver 17 is lowered, the on-off valve 3 is closed to return to the initial state.

As described above, during heating operation, the burner heats the refrigerant to transfer the heat to the indoor unit, so it is possible to blow out high-temperature strong winds even at low outside temperatures, but pump down is required before starting combustion. Therefore, even if the heating operation is performed, a waiting time is required until the heating is actually started by burning, which is inconvenient for the user. Therefore, there has been a means of pumping down after the combustion is stopped to recover the refrigerant, and immediately after the heating operation is performed, the fuel is burned to start heating.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned method, after heating is stopped, if the temperature of the heat exchanger on the discharge side of the compressor is high and the fan is stopped in that state, the gas is discharged from the compressor. The high-pressure gas of the refrigerant is not radiated and the discharge pressure becomes high, so that the pressure difference between the discharge side and the suction side of the compressor is large and it is difficult to recover the refrigerant. Therefore, there is a problem in that the refrigerant required during the heating operation is not sufficiently recovered and there is a risk that the heat source will be in an idle state after the start of combustion.

The present invention is to solve such conventional problems, and an object of the present invention is to provide a safe air conditioner in which the refrigerant necessary for heating is sufficiently recovered in the recovery operation after the end of the heating operation to avoid the risk of idle burning. To do.

Means for Solving the Problems In order to solve the above problems, the control device for an air conditioner of the present invention is a heat exchanger that heats air by heat exchange between a heat source and a heat medium that heats a heat medium by combustion, Heat transfer means for circulating a heat medium between the heat source and the heat exchanger, recovery means for recovering the heat medium to the heat source, a fan for blowing out air heated by the heat exchanger, and a motor for driving the fan And a control unit that controls the drive of the recovery unit and the motor, the heat transfer unit receiving a heat from the heat exchanger and flowing in a liquefied heat medium, and a heat receiver to the heat receiver. There is an on-off valve that opens when a predetermined amount of medium has accumulated and applies the evaporating pressure of the heat medium heated by the heat source to allow the liquid heat medium to flow into the heat source and close it, and the recovery means includes a compressor. And the control unit turns off the heating operation. A switch switch, a timer for counting a predetermined time by a stop signal of the switch, a recovery operation unit for driving the recovery means during counting of the timer, and a motor control unit for driving the motor during counting of the timer It is what

Operation According to the present invention, the motor control unit drives the motor and the fan while the recovery operation unit is performing the recovery operation after the heating operation unit finishes the heating operation.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description of the embodiment, the same parts as those in FIG. 4 will be designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows a system block diagram of the present invention. In FIG. 1, 18 is a heat transfer means having the same function as in FIG. 4, which includes an opening / closing valve 3, a third check valve 16 and a liquid receiver 17, and 19 is a recovery for recovering the refrigerant in the heat source 11. Means including a third solenoid valve 4, a fourth solenoid valve 5, a compressor 6, a second check valve 7, a first check valve 10, 20 is a motor for driving a fan 14, 21 is a heat source 11 heat transfer means Reference numeral 18 denotes a control unit that controls the collecting unit 19 and the motor 20, and 22 denotes a switch that switches start and stop of heating operation. The heating operation is performed when the switch 22 is ON.
During the heating operation, the refrigerant heater 11 heats the refrigerant, and the high temperature and pressure of the refrigerant gas increases due to the increase in the pressure evaporated by the heating.
From 11 to the 3rd solenoid valve 4, it is pressure-fed from the refrigerant pipe 12 to the indoor heat exchanger 13. At this time, when the indoor fan 14 is operated, the high-temperature and high-pressure refrigerant gas radiates heat and is heated to condense and liquefy. The refrigerant liquid flows from the refrigerant pipe 15 through the third check valve 16 into the liquid receiver 17 to be received. When the liquid level of the liquid received reaches a certain level, the on-off valve 3 is opened, and the evaporating pressure is applied to the liquid receiver 17, and the liquid level of the liquid receiver 17 flowing into the refrigerant heater 11 is lowered and then opened and closed. The valve 3 is closed and returned to the initial state. By repeating this operation, that is, by repeatedly opening and closing the on-off valve 3, heat is transferred and heated. A timer 23 counts a predetermined time when the switch 22 is turned off. A collection operation unit 24 drives the collection means 19 when a signal for counting a predetermined time is input from the timer 23. In the recovery operation, the first solenoid valve 1, the second solenoid valve 2, and the opening / closing valve 3 are closed as in the conventional example, and the third solenoid valve 4 and the fourth solenoid valve 5 are closed.
To operate the compressor 65. The refrigerant passage was sealed by the action of the first solenoid valve 1 and the second check valve 7, and leaked during the heating operation that was distributed to the refrigerant condenser 8, the accumulator 9, and various refrigerant pipes connecting the same. The refrigerant is sucked down by the operation of the compressor 6, and all the refrigerant is recovered by the refrigerant heater 11 through the first check valve 10. Similarly, 25 is a motor control unit which drives the motor 20 when a signal for counting a predetermined time is input from the timer 23. 26
Is for detecting the temperature of the refrigerant flowing into the heat exchanger 13 by the temperature detecting means, and is attached to the inlet of the refrigerant pipe. Reference numeral 27 is a comparison unit, and the detection temperature T of the detection means 26 is the set temperature TS.
If T <TS1 with respect to 1, a stop signal is transmitted to the motor control unit 25. Even if the motor control unit 25 receives the counting signal from the timer 23, the motor control unit 25 stops the motor 20 when the stop signal is input from the comparison unit 27. 28 is a second comparison unit and comparison unit 27
If the temperature detected by the temperature detecting means 26 is T> TS2, then a drive signal is transmitted to the motor control section 25, and the motor control section 25 causes the motor 20 to rotate.
To drive. The stop signal from the comparison unit 27 is also the second comparison unit 28.
If there is also no drive signal from, that is, if TS1 <T <TS2, the motor control unit 25 maintains the drive state when the motor 20 is being driven, and maintains the stop state when the motor 20 is stopped. When the timer 23 completes counting the predetermined time, the recovery operation unit 24
Stops driving the collecting means 19, and the motor control unit 25
Stop driving 20. The temperature detected by the temperature detecting means 26 while the timer 24 is counting and the control state of the motor controller 25 are
Shown in the figure. After that, when the switch 22 is turned on again, the control 21 drives the heat source 11 and the heat transfer means 18 to perform the heating operation. In this way, by controlling the driving stop of the motor 20 between the set temperature TS1 and the second set temperature TS2, it is possible to prevent blowing cold air to the user. FIG. 3 shows a flowchart when the above processing flow is realized by a microcomputer.
In FIG. 3, the numbers of the parts having the function are added to the side.

Effects of the Invention As described above, according to the control device for an air conditioner of the present invention, the following effects are obtained.

(1) Since the fan is driven during the recovery operation after the end of the heating operation, the heat exchanger is cooled, the pressure on the discharge side of the compressor is reduced, and recovery is facilitated. Therefore, it is possible to provide a safe air conditioner in which a sufficient amount of the refrigerant required for the heating operation is secured and the danger of an idle state in the heat source during combustion can be avoided.

(2) Since the discharge pressure of the compressor is reduced, there is an effect of reducing the power consumption of the compressor during the recovery operation.

[Brief description of drawings]

FIG. 1 is a system block diagram of a control device for an air conditioner according to an embodiment of the present invention, FIG. 2 is a characteristic diagram showing a temperature detected by a temperature detecting means and an operation of a motor, and FIG. 3 is a processing of a microcomputer. FIG. 4 is a flowchart showing the flow, and FIG. 4 is a system diagram for explaining a conventional example. 11 ... Heat source, 13 ... Heat exchanger, 18 ... Heat transfer means, 19 ...
... collection means, 20 ... motor, 21 ... control section, 22 ... switch, 23 ... timer, 24 ... collection operation section, 25 ... motor control section.

 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-59-107132 (JP, A) JP-A-59-107129 (JP, A) JP-A-63-99467 (JP, A) JP-A-63- 267863 (JP, A) Actual development Sho 59-60463 (JP, U)

Claims (3)

[Claims] 1. A heat source for heating a heat medium by combustion, a heat exchanger for heating air by heat exchange with the heat medium, and a heat transfer means for circulating the heat medium between the heat source and the heat exchanger.
It has a recovery means for recovering the heat medium to the heat source, a fan for blowing out the air heated by the heat exchanger, a motor for driving the fan, and a controller for controlling the recovery means and the drive of the motor. The heat transfer means is a liquid receiver for radiating a liquefied heat medium that radiates heat in the heat exchanger, and a heat medium evaporated by the heat source that is opened when the heat medium is collected in the liquid receiver. There is an on-off valve that applies pressure to cause the liquid heat medium to flow into the heat source to close the heat source, the recovery means has a compressor, the control unit has a switch for switching start and stop of heating operation, and the switch A timer that starts operation by a stop signal and outputs a recovery operation signal and a motor drive signal for a predetermined time, a recovery operation unit that drives the recovery means when a recovery operation signal is input from the timer, and a motor from the timer. Control device for an air conditioner having a motor control unit for driving the motor and inputs the motion signal. 2. A temperature detecting means for detecting the temperature of the heat medium flowing into the heat exchanger is provided in a pipe serving as an inflow path of the heat medium,
The air conditioner according to claim 1, wherein the control unit includes a comparison unit that transmits a stop signal to the motor control unit when the temperature detected by the temperature detection unit becomes equal to or lower than a set temperature while the recovery operation unit is driving the recovery unit. Machine control device. 3. The control section drives the motor control section when the temperature detected by the temperature detection section becomes equal to or higher than a second set temperature higher than the set temperature while the recovery operation section is driving the recovery section and the motor control section is stopping the motor. The control device for an air conditioner according to claim 1, further comprising a second comparison unit that transmits a signal.