JP2543166B2 - 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 indoor and outdoor units with refrigerant pipes, and in particular, using a liquid fuel such as petroleum as a heat source to heat a refrigerant with a burner etc. The present invention relates to an air conditioner that conveys heat to a unit for heating.

2. Description of the Related Art A heat pump air conditioner is generally put into practical use as a device for heating and cooling air by connecting refrigerant units to indoor and outdoor units. But in the case of heat pump air conditioners,
There is a problem that the capacity decreases at the low outdoor temperature that requires the most heating, and that the heating is temporarily stopped and the defrosting operation is required to remove the frost formation on the outdoor heat exchanger. There are challenges in driving. In order to solve the above-mentioned heating problem of the heat pump air conditioner, a method has been proposed in which the refrigerant is heated by a gas or oil burner, and the compressor transfers heat to the indoor unit for heating. In this case,
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, at the time of heating operation, first, at the start of heating, the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, and the opening / closing valve 4 are closed, and the fourth solenoid valve 5 is opened. A burner (not shown) is ignited to start 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 radiates heat and is heated to condense and liquefy. Refrigerant liquid from the refrigerant pipe 10 to the first check valve
After passing through 11, the liquid flows into the liquid receiver 12 and is received. When the liquid level of the liquid receiving liquid reaches a certain level, the on-off valve 4 is opened, and the evaporation pressure is applied to the liquid receiving device, which has the same static pressure as that of the refrigerant heater 6. Due to the head differential pressure, the refrigerant liquid in the liquid receiver 12 flows into the refrigerant heater. After the liquid level of the liquid receiver 12 is lowered, the on-off valve 4 is closed to return 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 passage is sealed by the action of the first solenoid valve 1 and the second check valve 14, the refrigerant distributed in the outdoor refrigerant condenser 15, the accumulator 16 and various refrigerant pipes connecting the same is compressed. Machine
In operation 13, the refrigerant is sucked and collected, and all the refrigerant is pumped to the refrigerant heater through the third check valve 17. After the end of this recovery operation, the compressor 13 is stopped and the first solenoid valve 1,
Second solenoid valve 2, third solenoid valve 3, fourth solenoid valve 5, on-off valve 4
Closes and returns to the heating stopped state.

Further, during the cooling operation, the first solenoid valve 1 and the second solenoid valve 2
Is opened, the third solenoid valve 3, the fourth solenoid valve 5, and the opening / closing valve 4 are closed, and the compressor 13 is operated. The refrigerant gas that has become high temperature and high pressure due to the operation of the compressor 13 is pressure-fed to the outdoor refrigerant condenser 15 from the third check valve 17, the refrigerant heater 6, and the first electromagnetic valve 1.
At this time, by operating the outdoor fan 29, the high-temperature and high-pressure refrigerant gas radiates heat to be condensed and liquefied. The liquefied refrigerant passes through the second check valve 14 and the liquid receiver 12, is decompressed by the capillary tube 30, and then is sent to the indoor heat exchanger 8. In the indoor heat exchanger 8, the low-pressure refrigerant absorbs heat by operating the indoor fan 9 and evaporates by evaporating by cooling. The vaporized refrigerant gas is compressed again by the compressor 13, and the above operation is repeated. That is, the cooling operation is realized by repeating the operations of compression → condensation → decompression → evaporation as in the conventional heat pump air conditioner.

As described above, during the heating operation, the heating cycle is configured by dropping the refrigerant liquid using the increase in the vapor pressure due to the heating of the refrigerant, which requires the conventional operation of the compressor or pump using electricity. The heating operation is performed without any operation.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, the refrigerant pumped up to the heater at the end of the heating operation does not allow the first solenoid valve 1, the second check valve 14, and the third solenoid valve 1 to operate while the heating operation is stopped. Via valve 3 etc.
Since the refrigerant gradually leaks to the compressor 13, accumulator 16 and room temperature refrigerant condenser 15, the amount of refrigerant during the heating cycle decreases, and when heating operation is performed with insufficient refrigerant, the temperature of the heater is abnormal. There was a problem of rising to the ground and causing danger.

Means for Solving the Problems In order to solve the above problems, the air conditioner of the present invention is an outdoor refrigerant condenser by the operation of a compressor, indoor heat that is absorbed and cooled by evaporation of a heat medium sent through a capillary tube. An exchanger, a heating device for heating a heat medium by combustion of liquid fuel in a circulation circuit of the heat medium, a vaporizer for vaporizing the liquid fuel, a vaporization heater for heating the vaporizer, and an inside of the vaporizer Temperature detection means for detecting the temperature of the heating medium, heat transfer means for heating the heating medium by circulating the heating medium from the heating device to the indoor heat exchanger, and recovery for recovering the heating medium to the heating device by operating the compressor. Means, a vaporization heater, a control means for controlling the carrying means, and the recovery means, wherein the control part is a heating operation part for driving the heat transfer means, and a recovery operation part for driving the recovery means. When A vaporization heater control unit that energizes the vaporization heater until the temperature detected by the temperature detection unit exceeds a first set temperature; and the recovery operation unit until the temperature detected by the temperature detection unit exceeds a second set temperature. And a switching unit for instructing the heating operation unit to operate after the temperature detected by the temperature detecting means exceeds the second set temperature.

Effect According to the present invention, the temperature inside the carburetor detected by the temperature detecting means exceeds the second set temperature and reaches the vaporizable temperature of the liquid fuel before the heating operation unit starts heating by the above-described configuration. Until then, the recovery operation part performs recovery operation of the heat medium leaked to the compressor, accumulator, and outdoor refrigerant condenser.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. In the embodiments, the same parts as those in FIG. 6 are designated by the same reference numerals for convenience, detailed description will be omitted, and different parts will be 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 liquid fuel, 18 is a vaporizer for vaporizing the liquid fuel, 19 is a vaporization heater for heating the vaporizer 18, 20 is temperature detecting means for detecting the temperature of the vaporizer 18, Reference numeral 8 is a heat exchanger that heats air by heat exchange with the heat medium, and 21 is heat transfer means that circulates the heat medium between the heating device 6 and the heat exchanger 8 to perform heating. 1 Check valve 11 22 is a compressor from the first solenoid valve 1 to the outdoor refrigerant condenser 15, the second check valve 14 and the third solenoid valve 3, etc.
Recovery means for recovering the heat medium leaking to the accumulator 16 and the accumulator 16 to the heating device 6, and includes the compressor 13, the third solenoid valve 3, the fourth solenoid valve 5, the second check valve 14, and the third check valve 17. It is composed of 23 is a vaporization heater 19, heat transfer means 21 and recovery means 22
Is a control unit for controlling. FIG. 2 is a configuration diagram of the control unit 23. 24 is an operation switch for switching the operating state, 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 vaporization heater control unit that controls the energization of the vaporization heater 19, 28 Is the heating operation section 25 Recovery operation section
It is a switching unit for instructing 26 to drive.

The control of the vaporization heater 19 will be described with reference to FIG. T is a temperature detected by the temperature detecting means 20. T ₁ and T ₃ are temperatures that change the energization state of the vaporization heater 19, and T ₁ is T ₃
Higher than. Further, T ₁ is the first set temperature shown in the claims. When the operation switch 24 is off, the vaporization heater 19 is not energized. When the operation switch 24 is switched from off to on, energization is started, and energization is maintained until T exceeds the first set temperature T ₁ . When T exceeds T ₁ , energization is stopped, and when T falls below T ₃ , energization is restarted.

The control of the heating operation unit 25 and the recovery operation unit 26 will be described based on FIG. T ₂ is the second set temperature indicated in the claims in which the switching unit 28 switches the operation instruction from the collection operation unit 26 to the heating operation unit 25, and the user is higher than T ₃ and lower than T ₁ at the start of heating. When the operation switch 24 is switched from OFF to ON, the recovery operation unit 26 starts driving the recovery operation unit 22. During the recovery operation, the third solenoid valve 3 and the fourth solenoid valve 5
And the first solenoid valve 1, the second solenoid valve 2, and the on-off valve 4 are closed, and at the same time, the compressor 13 is operated. At this time, the refrigerant path is sealed by the action of the first solenoid valve 1 and the second check valve 14, so that the outdoor refrigerant condenser 15 and the accumulator 16 are provided.
The refrigerant distributed in the various refrigerant pipes connected thereto is pumped up to the heating device 6 via the third check valve 17. The recovery operation is continued until T exceeds the second set temperature T ₂ . T
When T exceeds T ₂ , it is considered that the temperature of the carburetor has reached the vaporizable temperature, the operation instruction issued from the switching unit 28 is switched from the collection operation unit 26 to the heating operation unit 25, and the heating operation unit 25 transfers heat. The driving of the means 21 is started. At the start of heating, the fourth
The solenoid valve 5 is opened, and the first solenoid valve 1, the second solenoid valve 2 and the third solenoid valve are opened.
The solenoid valve 3 and the on-off valve 4 are closed, and the refrigerant in the heating device 6 is heated by the burner. The high-temperature and high-pressure heat medium that is evaporated and vaporized by heating is transferred from the heating device 6 to the fourth solenoid valve 5,
It is pressure-fed from the refrigerant pipe 7 to the indoor heat exchanger 8. At this time, when the indoor fan 9 is operated, the heat medium having a high temperature voltage radiates heat to condense and liquefy by heating. The liquefied heat medium flows into the liquid receiver 12 from the refrigerant pipe 10 through the first check valve 11 and is received. Open / close valve 4 when the liquid level of the received liquid reaches a certain level
, The evaporation pressure will be applied to the receiver 12,
Since the static pressure becomes the same as that of the heating device 6, the liquid heat medium in the liquid receiver 12 flows into the heating device 6 due to the liquid surface head differential pressure in the liquid receiver 12. After the liquid level of the liquid receiver 12 drops, the on-off valve 4 closes and returns to the initial state. After that, opening and closing of the on-off valve 4 are repeated in synchronization with the rise and fall of the liquid level of the liquid receiver 12 to carry out heat transfer. When the user switches the operation switch from on to off, the heating operation part 25 stops driving the heat transfer means 21.

Effects of the Invention As described above, according to the air conditioner of the present invention, the following effects can be obtained.

(1) When the heating operation is started, the heat medium recovery operation is performed until the temperature of the carburetor reaches the vaporizable temperature, so that the refrigerant gradually leaks from the inside of the heating cycle to the outdoor refrigerant condenser, the compressor, and the accumulator while the heating operation is stopped. The discharged heat medium can be recovered.

(2) Since the recovery operation and the energization of the carburetor are performed in parallel,
It is possible to effectively use the waiting time after turning on the operation switch until the temperature of the carburetor reaches the temperature at which the liquid fuel can be vaporized and the heating operation is actually started.

[Brief description of 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 same control unit, FIG. 3 is a flowchart explaining control of a vaporization heater, and FIG. 4 is a heating operation unit. And a flowchart for explaining the operation state of the recovery operation unit,
FIG. 5 is an explanatory view showing the operating states of the vaporization heater and the air conditioner depending on the detected temperature of the temperature detecting means and the state of the operation switch, and FIG. 6 is a circuit configuration diagram of the 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 section, 25 …… Heating operation section, 26 …… Recovery operation section, 27 …… Evaporation heater control Division, 28
...... Switching part,

Claims (1)

(57) [Claims] 1. An indoor heat exchanger that absorbs heat and cools by evaporation of a heat medium sent through an outdoor refrigerant condenser and a capillary tube by operating a compressor, and a liquid fuel combustion in a circulation circuit of the heat medium. A heating device for heating a heat medium by means of a vaporizer, a vaporizer for vaporizing liquid fuel, a vaporization heater for heating the vaporizer, a temperature detecting means for detecting a temperature in the vaporizer, and a heating medium for heating the heat medium from the heating device. A heat transfer means for circulating the indoor heat exchanger for heating, a recovery means for recovering a heat medium to the heating device by operating the compressor, the vaporization heater, the heat transfer means, and the recovery means. A heating operation unit that drives the heat transfer unit, a recovery operation unit that drives the recovery unit, and a detection temperature of the temperature detection unit that is a first set temperature. Until crossing Until the temperature detected by the vaporization heater control unit that energizes the vaporization heater exceeds the second set temperature, the recovery operation unit is instructed to operate, and the temperature detected by the temperature detection unit is set to the second set temperature. An air conditioner having a switching unit for instructing the heating operation unit to operate after the temperature is exceeded.