JP2574439B2 - Air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for air-conditioning by connecting an indoor / outdoor unit to a refrigerant pipe, and in particular, using a liquid fuel such as petroleum as a heat source to heat the refrigerant with a burner or the like, TECHNICAL FIELD The present invention relates to an air conditioner that heats and transports heat to an air conditioner.

2. Description of the Related Art A heat pump air conditioner is generally put into practical use as a device for heating and cooling by connecting refrigerant pipes between indoor and outdoor units. However, in the case of a heat pump air conditioner,
There is a problem in that the capacity is reduced at the time of the low outdoor temperature where heating is required most, and the heating is temporarily stopped to remove the frost of the outdoor heat exchanger and a defrosting operation is required. Driving challenges remain. In order to solve the above-described problems of heating a heat pump air conditioner, a method has been proposed in which a refrigerant is heated by a gas or petroleum burner, and the heat is transferred to an indoor unit by a compressor and heated. In
Electricity associated with compressor operation will also be used together with gas or oil, and this is not enough for widespread use in terms of operation and maintenance costs.

FIG. 6 shows a system which has already been filed by the applicant to solve such problems. That is, in FIG. 6, during the heating operation, first, at the start of heating, the first solenoid valve 1, the second solenoid valve, the third solenoid valve 3, and the on-off valve 4 are closed, the fourth solenoid valve 5 is opened, and the burner is opened. (Not shown) to start the heating operation. The refrigerant in the refrigerant heater 6 is heated by the burner and evaporates to increase the evaporation pressure, and the evaporated high-temperature and high-pressure refrigerant gas is supplied from the refrigerant heater 6 to the fourth solenoid valve 5 and from the refrigerant pipe 7 to the indoor heat exchanger. 8 to be pumped. At this time, when the indoor fan 9 is operated, the high-temperature and high-pressure refrigerant gas releases heat and is heated to perform pseudo-shrinkage and liquefaction. The refrigerant liquid flows into the liquid receiver 12 from the refrigerant pipe 10 via the first check valve 11, and is received. When the liquid level of the liquid receiver reaches a certain level, the on-off valve 4 is opened, and the evaporating pressure is applied to the liquid receiver, and the same static pressure as that of the refrigerant heater 6 is applied. By head differential pressure,
The refrigerant liquid in the liquid receiver 12 flows into the refrigerant heater. Liquid receiver 12
After the liquid level drops, the on-off valve 4 closes to the initial state.

At the end of the heating operation, the third solenoid valve 3 is opened and the on-off valve 4
Is closed and the compressor 13 is operated. Since the refrigerant system path is sealed by the action of the first solenoid valve 1 and the second check valve 14, the refrigerant distributed to the outdoor refrigerant pseudo-compressor 15, the accumulator 16 and the various refrigerant pipes connected to the same. Is a compressor
In the operation of 13, the refrigerant is sucked and collected, and all the refrigerant is pumped to the refrigerant heater via the third check valve 17. After the completion of the recovery operation, the compressor 6 is stopped, and the first solenoid valve 1,
The second solenoid valve 2, the third solenoid valve 3, the fourth solenoid valve, and the on-off valve 4 close and return to the heating stop state.

As described above, during the heating operation, the heating cycle is constituted by the drop of the refrigerant liquid utilizing the increase in the vapor pressure due to the refrigerant heating, and it is necessary to operate the compressor or the pump using the conventional electricity. The heating operation is performed without performing.

Problems to be Solved by the Invention However, in the above configuration, the refrigerant pumped into the heater at the end of the heating operation gradually leaks to the compressor, the accumulator and the outdoor refrigerant pseudo-compressor during the stop of the heating operation. However, when the amount of the refrigerant during the heating cycle is reduced and the heating operation is performed with the amount of the refrigerant being insufficient, there is a problem that the temperature of the heater is abnormally increased to cause danger.

The present invention has been made to solve such a problem, and has as its object to 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, an air conditioner of the present invention includes a heating device for heating a heat medium with a fuel of a liquid fuel, a vaporizer for vaporizing a liquid fuel, and heating the vaporizer. Vaporizing heater, temperature detecting means for detecting the temperature in the vaporizer, a heat exchanger for heating air by heat exchange with a heat medium, and circulating a heat medium through the heating device and the heat exchanger. Heat transfer means for performing heating, a recovery means for recovering a heat medium to the heating device, a control unit for controlling the vaporization heater, the heat transfer means and the recovery means, wherein the control unit, the heat A heating operation unit that drives the conveyance unit, a collection operation unit that drives the collection unit for a predetermined time, a switch that switches the start and stop of the heating operation, and a stop signal that instructs the collection movement unit to operate by a stop signal of the switch. Receiving Unit, a timer for measuring an elapsed time from the end of the operation of the recovery operation unit by the stop signal of the switch, and detection of the temperature detection unit during operation of the recovery operation unit and when the timer has not elapsed the set time. A vaporizing heater control unit that controls the energization of the vaporizing heater according to the temperature, and when the timer has not passed the set time when the start signal of the switch is received, instructs the heating operation unit to operate and the timer has passed the set time. If so, the apparatus has a start signal receiving unit that instructs the recovery operation unit to operate before instructing the heating operation unit to operate.

Operation With the above configuration, the air conditioner of the present invention always performs the recovery operation at the end of the heating operation, and measures the elapsed time after the end of the recovery operation by the timer. At the start of the heating operation, if the timer has passed the set time, it is considered that the amount of the heat medium leaked out of the heating cycle is large, and the heating operation is started after collecting the insufficient heat medium by the recovery operation. I have.

Further, during the recovery operation and until the timer elapses the set time, the energization of the vaporization heater is controlled so that the temperature in the vaporizer becomes a temperature at which the liquid fuel can be vaporized.

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

FIG. 1 shows a system block diagram of the present invention. 6 is a heating device for heating the heat medium by burning the liquid fuel, 18 is a vaporizer for vaporizing the liquid fuel, 19 is a vaporizer for heating the vaporizer 18, 20 is a temperature detecting means for detecting the temperature of the vaporizer 18, 8 is a heat exchanger for heating the air by heat exchange with the heat medium, 21 is a heat transfer means for circulating the heat medium in the heating device 6 and the heat exchanger 8 for heating, and 22 is a heat transfer device for the heating device 6. The collecting means 23 for collecting is a control unit for controlling the vaporizing heater 19, the heat transfer means 21 and the collecting means 22. FIG. 2 shows the control unit 23
FIG. 24 is a switch for switching the start and stop of the heating operation, 25 is a heating operation unit that drives the heat transfer means 21, 26
Is a recovery operation unit that drives the recovery means 22, 27 is a stop signal receiving unit that instructs the recovery operation unit 26 to operate by a stop signal of the switch 24, and 28 is activated after the completion of the recovery operation performed by the stop signal of the switch 24. This is a timer for measuring the elapsed time. Reference numeral 29 denotes a start signal receiving unit that receives a start signal and instructs the heating operation unit 25 or the recovery operation unit 26 to perform operation, and 30 denotes a vaporization heater control unit that controls energization of the vaporization heater 19 based on the temperature detected by the temperature detection unit 20. .

The operation of the control unit 20 will be described with reference to FIG.
When the user switches the switch 24 to start at the time of starting the heating operation, the start signal receiving unit 29 receives a start signal of the switch 24. At this time, if the set time of the timer 28 has elapsed, the collection operation is started by the collection operation unit 26. Simultaneously with the start of the recovery operation, the vaporization heater control unit 30 starts energization of the vaporization heater 19 which has been stopped, and thereafter performs control according to the temperature detected by the temperature detection means 20. When the recovery operation for a predetermined time is completed, the heat transfer means 21 starts the heating operation. On the other hand, when the set time has not elapsed on the timer 28, the start signal receiving unit 29 instructs the heating operation unit 26 to operate. At this time, since the timer 28 does not exceed the set time, the vaporization heater control unit 30 controls the energization to the vaporization heater 19 so that the temperature in the vaporizer 18 becomes the vaporizable temperature of the liquid fuel as described later. ing. Therefore, the heating operation can be started at the same time when the switch 24 is switched to the start. To stop the heating operation, the user switches the switch 24 to stop. The stop signal receiving unit 27 instructs the collecting operation unit 26 to perform a collecting operation for a predetermined time at the same time as receiving the stop signal. After the end of the predetermined time, the timer 28 starts measuring the elapsed time after the end of the collection operation. Thereafter, until switch 24 is switched to start,
Although the heat transfer means 21 and the recovery means 22 have also stopped driving,
Until the set time set by the timer 28 is exceeded, the vaporizing heater control unit 30 controls the vaporizer temperature by the vaporizing heater 19 in preparation for the next heating operation. After that, switch 24
Is switched to the start, the above operation is repeated according to the elapsed time of the timer 28. Therefore, when the set time has elapsed after the end of the recovery operation, it is determined that the amount of refrigerant leaked from the heating cycle is large, and the heating operation is started after the recovery operation is performed. Therefore, even when the heating operation is ended and left for a long time, it is possible to avoid a shortage of the heat medium in the heating cycle.

Next, the control of the vaporization heater control unit 30 will be described with reference to FIG. T is the temperature detected by the temperature detecting means, TOF
F, TON is the temperature at which the energization state of the vaporization heater 19 is changed, and TOFF is higher than TON. During the recovery operation and until the timer 28 exceeds the set time after the recovery operation, the temperature in the vaporizer is adjusted according to the temperature detected by the temperature detection means 20 so that the temperature in the vaporizer becomes the vaporizable temperature of the liquid fuel in preparation for the heating operation. The energization of the vaporization heater 19 is performed. That is, the vaporizing heater control unit 30 starts energizing the vaporizing heater 19 simultaneously with the start of the function, and the energizing is maintained until T exceeds TOFF. When T exceeds TOFF, energization is stopped, and when T falls below TON, energization is resumed. When the timer 28 exceeds the set time, the energization of the vaporization heater 19 is stopped. Therefore,
Even after the heating operation is stopped, the temperature in the vaporizer is maintained at the vaporizable temperature until the timer 28 exceeds the set time, and the switch is turned on.
It becomes possible to start the heating operation at the same time as switching the start to 24. When the set time is exceeded, the power supply to the vaporization heater is stopped, so that unnecessary power consumption can be eliminated.

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

(1) The elapsed time from the end of the recovery operation at the end of the heating operation is measured by a timer, and at the start of the heating operation, the recovery of the heat medium is performed by the recovery operation when the set time has elapsed. Therefore, if the heating medium has not been used for a long time after the heating operation, the heat medium leaked from the heating cycle can be recovered, and the shortage can be compensated.

(2) Until the timer exceeds the set time, the temperature of the vaporizer is maintained at the temperature at which the liquid fuel can be vaporized by the vaporizing heater, so if the timer has not passed the set time, the heating operation will be performed without waiting time. Can be started.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an air conditioner in one embodiment of the present invention, FIG. 2 is a configuration diagram of the control unit, FIG. 3 is a flowchart illustrating control of a heating operation unit and a recovery operation unit, FIG. FIG. 5 is a flowchart illustrating control of the vaporization heater, and FIG.
FIG. 1 is a circuit configuration diagram of a conventional air conditioner. 6 ... heating device, 8 ... heat exchanger, 18 ... vaporizer, 19 ...
... Evaporation heater, 20 ... Temperature detection means, 21 ... Heat transfer means, 22 ... Recovery means, 23 ... Control unit, 24 ... Switch
25 ... Heating operation part, 26 ... Recovery operation part, 27 ... Stop signal receiving part, 28 ... Timer, 29 ... Start signal receiving part, 30 ...
... Evaporation heater control unit.

Claims (1)

(57) [Claims] 1. A heating device for heating a heating medium with a liquid fuel, a vaporizer for vaporizing the liquid fuel, a vaporizer 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 the heat medium, a heat transfer unit that circulates the heat medium through the heating device and the heat exchanger to perform heating, and heats the heat medium through the heating device. A recovery unit that controls the vaporization heater, the heat transfer unit, and the recovery unit; the control unit includes a heating operation unit that drives the heat transfer unit; A recovery operation unit that drives the means, a switch that switches the start and stop of the heating operation,
A stop signal receiving unit that instructs the collection motion unit to operate by the stop signal of the switch, a timer that measures an elapsed time from the end of operation of the collection operation unit by the stop signal of the switch, and an operation of the collection operation unit. A vaporization heater control unit that controls the energization of the vaporization heater based on the temperature detected by the temperature detection unit when the timer has not elapsed before the timer has elapsed and when the timer has not elapsed the time when the switch start signal is received. Air conditioning having a start signal receiving unit for instructing the recovery operation unit to instruct the heating operation unit before instructing the heating operation unit if the timer has passed a set time. Machine.