JPH0718605B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner that air-conditions by connecting indoor and outdoor units with heat medium pipes, and particularly heats a heat medium with a burner using a liquid fuel such as petroleum as a heat source. However, the present invention relates to an air conditioner that conveys heat to an indoor unit to perform heating.

2. Description of the Related Art A heat pump air conditioner is generally put into practical use as an air conditioner that performs heating and cooling by connecting indoor and outdoor units with a heat medium pipe. However, in the case of heat pump air conditioners, the capacity decreases at the low outdoor temperature when heating is the most necessary, and heating is temporarily stopped to defrost the outdoor heat exchanger, and defrosting operation is required. However, there are problems in heating operation. In order to solve the above problems of heating a heat pump air conditioner, a device has been proposed in which a heat medium is heated by a gas or oil burner, and heat is transferred to an indoor unit by a compressor for heating. In this case, electricity accompanying the operation of the compressor will be used together with gas or oil, and it has not reached the point of widespread use in terms of operation and maintenance costs.

An air conditioner as shown in FIG. 5 has already been proposed as a solution to such a problem. In FIG. 5, during the heating operation, the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, and the opening / closing valve 5 are first closed at the start of heating, and the fourth solenoid valve is opened.
The solenoid valve 4 is opened and a burner (not shown) is ignited to start heating operation. The heat medium in the heat medium heater 6 is heated by the burner to evaporate, and the high temperature and high pressure heat medium gas evaporated by the increase of the evaporation pressure is transferred from the heat medium heater 6 through the fourth solenoid valve 4 and the heat medium pipe 7. Indoor heat exchanger 9
Pumped to. At this time, when the indoor fan 10 is operated, the heat medium gas of high temperature and high pressure radiates heat and is heated to condense and liquefy. The heat medium liquid flows from the heat medium pipe 8 through the first check valve 11 into the liquid receiver 14 to be received. When the liquid level in the liquid receiver 14 reaches a certain level, the on-off valve 5 is opened, and the evaporating pressure is applied to the liquid receiver 14 and the same static pressure as that of the heat medium heater 6 is reached. The heat medium liquid in the liquid receiver 14 flows into the heat medium heater 6 due to the liquid head differential pressure. After the liquid level of the liquid receiver 14 is lowered, the on-off valve 5 is closed to return to the initial state.

At the end of the heating operation, the third solenoid valve 3 is opened, the on-off valve 5 is closed, and the compressor 16 is operated. Since the heat medium passage is sealed by the first solenoid valve 1 and the second check valve 12, the outdoor heat medium condenser 15 and the accumulator are provided.
17 and the heat medium distributed in the various heat medium pipes connected to this will be sucked and recovered by the operation of the compressor 16,
All the heat medium is pumped to the heat medium heater 6 via the third check valve 13. After this recovery operation, the compressor 16 is stopped,
The first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, the fourth solenoid valve 4, and the opening / closing valve 5 are closed, and the heating is stopped.

As described above, during the heating operation, the heating cycle is configured by sending the heat medium liquid by using the increase in the vapor pressure due to the heating of the heat medium, and the conventional operation of the compressor or pump using electricity as in the past. The heating operation can be performed without the need for.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the air conditioner as described above, the heat medium pumped up to the heat medium heater 6 at the end of the heating operation causes the compressor 16, the accumulator 17, and the outdoor heat medium condensing during the heating operation stop. Since it gradually leaks to the heating device 15, the amount of heat medium in the heating system path decreases, and when heating operation is performed while the amount of heat medium is insufficient, the temperature of the heat medium heater 6 rises abnormally. It had the problem of causing danger.

The present invention solves such a problem, and an object of the present invention is to provide an air conditioner that can secure a heat medium amount in a heating cycle during a heating operation.

Means for Solving the Problems In order to solve the above problems, the air conditioner of the present invention is a heater that heats a heat medium by combustion of liquid fuel, a vaporizer that vaporizes liquid fuel, and the vaporizer is heated. A vaporizing heater, a temperature detecting means for detecting the temperature in the vaporizer, a heat exchanger for heating air by heat exchange with a heat medium, and a heat medium circulating in the heater and the heat exchanger. The heat transfer means for heating, the recovery means for recovering a heat medium to the heater, the vaporization heater, the heat transfer means, and a control section for controlling the recovery means, the control section, The heating operation unit that drives the conveying unit, the recovery operation unit that drives the recovery unit, the vaporization heater control unit that controls the energization of the vaporization heater according to the temperature detected by the temperature detection unit, and the start / stop of the heating operation are switched. Switch and the switch If a stop signal receiving unit that instructs the recovery operation unit to operate for a predetermined time by a stop signal of the switch, a timer that measures the elapsed time from the end of operation of the recovery operation unit, and if the timer has exceeded a set time A start signal receiving unit for instructing the recovery operation unit to operate by a start signal of the switch, and the start signal receiving unit instructs the heating operation unit to operate when the temperature detecting means exceeds a set temperature. It is configured to have a temperature comparison unit for instructing the recovery operation unit to stop.

Action With the above configuration, if the set time has elapsed since the previous recovery operation, it is considered that the amount of the heat medium leaking out of the heating system road is large, and the carburetor detected by the temperature detection means at the start of the heating operation. Since the recovery operation is performed until the internal temperature exceeds the set temperature and reaches the vaporizable temperature of the liquid fuel, the shortage of the heat medium is compensated by this.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. In the embodiment, the same parts as those in FIG. 5 are designated by the same reference numerals for convenience, detailed description will be omitted, and different parts will be mainly described.

FIG. 2 is a system configuration diagram of an air conditioner showing an embodiment of the present invention. The vaporizer 18 is connected to the heater 6 that heats the heat medium by burning the liquid fuel, and vaporizes the liquid fuel. The vaporization heater 19 is arranged at the bottom of the vaporizer 18 and heats the vaporizer 18. The vaporizer 18 is provided with temperature detecting means 20 for detecting the temperature of the vaporizer 18. The heat exchanger 9 heats the air by exchanging heat with the heat medium. The heat transfer means 21 having the heater 6 circulates a heat medium to perform heating. The recovery means 22 includes a compressor 16, an accumulator 17, etc., and recovers the heat medium to the heater 6. The vaporization heater 19, the heat transfer means 21, and the recovery means 22 are controlled by the control unit 23.

FIG. 1 shows a block diagram of the control unit 23. The switch 24 switches the start / stop of the heating operation and outputs a signal to the vaporization heater control unit 27, the start signal receiving unit 30, and the stop signal receiving unit 29.
The heating operation unit 25 drives the heat transfer unit 21, the recovery operation unit 26 drives the recovery unit 22, and the vaporization heater control unit 27 is the vaporization heater.
Controls energization of 19. Collection operation unit 26 and start signal receiving unit 30
A timer 28 connected to measures the elapsed time after the end of the operation of the recovery operation unit 26. The stop signal reception unit 29 instructs the recovery operation unit 26 to operate for a predetermined time by the stop signal of the switch 24. The start signal receiving unit 30 instructs the recovery operation unit 26 to operate if the timer 28 has elapsed a predetermined time when the start signal is input to the switch 24. The start signal receiving section 30 includes the temperature detecting means 20.
When the detected temperature T exceeds a predetermined temperature T _s , a temperature comparison unit 31 is provided to instruct the heating operation unit 25 to operate and to instruct the recovery operation unit 26 to stop.

The control of the vaporization heater 19 will be described with reference to FIG.
T is the temperature detected by the temperature detecting means 20 of the vaporizer 18, T _ON and T
_OFF is a turning-on temperature and a turning-off temperature for changing the energization state of the vaporization heater 19 from OFF to ON and from ON to OFF, and the turning-off temperature T _OFF is higher than the turning-on temperature T _ON . When the switch 24 is switched to start, energization to the vaporization heater 19 is started, and energization is maintained until the detected temperature T exceeds the cutoff temperature T _OFF . When the detected temperature T exceeds the cutoff temperature T _OFF , the power supply to the vaporization heater 19 is stopped, and when the detected temperature T falls below the input temperature T _ON , the vaporization heater 1
Energization to 9 is resumed. The above operation is repeated until the switch 24 is switched to stop, and at the same time when the switch 24 is switched to stop, the power supply to the vaporization heater 19 is stopped.

The control of the heating operation unit 25 and the recovery operation unit 26 will be described with reference to FIG. At the start of the first use, the collection operation section
The collection means 22 is driven by 26 and the collection operation is performed for a predetermined time. The timer 28 is started at the same time as the end of the recovery operation, and the elapsed time after the end of the recovery operation is measured. Next, until the start signal is transmitted from the switch 24, the heat transfer means 21 and the recovery means
22 both stop and maintain the heating stopped state. Switch 24
When the start signal is transmitted from, if the timer 28 has elapsed the set time, the start signal receiving unit 30 instructs the recovery operation unit 26 to operate to supplement the heat medium leaking from the heating system path. . This recovery operation is continued until the temperature T detected by the temperature detecting means 20 exceeds the predetermined temperature T _S. When the detected temperature T exceeds the predetermined temperature T _S , the temperature comparison unit 31 determines that the temperature of the carburetor 18 has reached the vaporizable temperature, instructs the heating operation unit 25 to operate, and the heating operation is started and the recovery operation is performed. Ends.
On the other hand, when the timer 28 has reached the end of the set time, the recovery operation is not performed, and when the detected temperature T exceeds the predetermined temperature T _S , the heating operation is started. The heating operation is continued until the stop signal is transmitted from the switch 24. When the stop signal is transmitted from the switch 24, the stop signal receiving unit 29 instructs the recovery operation unit 26 to operate for a predetermined time. When the collecting operation for a predetermined time is completed, the timer 28 is started, and the elapsed time after the completion of the collecting operation is measured until the start signal is transmitted from the switch 24 next time. After that, when the start signal is transmitted from the switch 24, the above operation is repeated according to the measurement time of the timer 28. Therefore, at the start of the heating operation, if the elapsed time since the previous recovery operation exceeds the set time, the recovery operation for compensating the amount of heat medium leaking from the inside of the heating system path is performed, and the temperature of the carburetor 18 is set to the liquid. It is performed until it reaches the vaporizable temperature of the fuel.

Effects of the Invention According to the air conditioner of the present invention, the following effects can be obtained.

(1) A timer counts the elapsed time after the end of the recovery operation, and when the timer elapses at the start of the heating operation, heat is recovered by the recovery operation until the temperature inside the vaporizer reaches the vaporizable temperature of the liquid fuel. The media is being collected. Therefore, when the heating medium has not been used for a long time after the end of the heating operation, the heat medium leaking from the inside of the heating system path can be recovered and the shortage can be compensated, and the temperature rise due to the shortage of the heat medium can be prevented.

(2) When the heating operation is temporarily stopped and then restarted while the carburetor temperature is relatively high, until the temperature of the carburetor reaches the set temperature and the liquid fuel becomes a vaporizable state. Since the time is short, the heating operation can be started in a short time after the switch is switched to the start.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a control unit of an air conditioner in one embodiment of the present invention, FIG. 2 is a system configuration diagram of the air conditioner, and FIG. 3 is a vaporization heater of the air conditioner. FIG. 4 is a flow chart for explaining the control, FIG. 4 is a flow chart for explaining the control of the heating operation section and the recovery operation section of the air conditioner, and FIG. 5 is a circuit configuration diagram of the conventional air conditioner. 6 ... Heater, 9 ... Heat exchanger, 14 ... Liquid receiver, 16 ...
Compressor, 18 ... vaporizer, 19 ... vaporization heater, 20 ... temperature detection means, 21 ... heat transfer means, 22 ... recovery means, 23 ...
Control unit, 24 ... Switch, 25 ... Heating operation unit, 26 ... Recovery operation unit, 27 ... Evaporation heater control unit, 28 ... Timer,
29 …… Stop signal receiver, 30 …… Start signal receiver, 31 ……
Temperature comparison part.

Claims (1)

[Claims] 1. A heater for heating a heat medium by burning a liquid fuel, a vaporizer for vaporizing the liquid fuel, a vaporization heater for heating the vaporizer, and a temperature detecting means for detecting a temperature in the vaporizer. A heat exchanger that heats air by heat exchange with a heat medium; heat transfer means that circulates the heat medium in the heater and the heat exchanger to perform heating; and recovers the heat medium in the heater. A recovery unit, a controller that controls the vaporization heater, the heat transfer unit, and the recovery unit are provided, and the control unit includes a heating operation unit that drives the heat transfer unit and a recovery unit that drives the recovery unit. An operation unit, a vaporization heater control unit that controls energization of the vaporization heater according to the temperature detected by the temperature detection unit, a switch that switches start and stop of the heating operation, and a recovery signal from the recovery operation unit for a predetermined time by a stop signal of the switch. Point to A stop signal receiving unit, a timer for measuring the elapsed time from the end of the operation of the recovery operation unit, and a start signal for starting the operation of the recovery operation unit by the start signal of the switch if the timer has elapsed a set time. An air conditioner having a signal receiving unit, the start signal receiving unit having a temperature comparison unit instructing the heating operation unit to operate when the temperature detection unit exceeds a set temperature and instructing the recovery operation unit to stop. Machine.