JP2507054B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for performing air conditioning by connecting indoor and outdoor units to a refrigerant pipe, and in particular, uses a liquid fuel such as petroleum as a heat source and heats the refrigerant with a burner or the like, and indoors. The present invention relates to an air conditioner that performs heat transfer by transferring heat to a unit.

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. 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 problems of heating a heat pump air conditioner, a method has been proposed in which a refrigerant is heated by a gas or oil burner and heat is transferred to an indoor unit by a compressor for heating. Has
Electricity associated with the operation of the compressor will be used together with gas or oil, and it has not come into widespread use in terms of operation and maintenance costs.

As a solution to such problems, Japanese Patent Application No. Sho 63-13498
Depending on the issue, there is a system as shown in FIG. That is, in FIG. 7, 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. At the same time, 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. 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 evaporation pressure is applied to the liquid receiver, so that the static pressure becomes the same as that of the refrigerant heater 6. Due to the differential pressure, the refrigerant liquid in the liquid receiver 12 flows into the refrigerant heater 6. Liquid receiver 12
After the liquid level of No. 3 has dropped, 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. The refrigerant passage is sealed by the action of the first solenoid valve 1 and the second check valve 14, so that the refrigerant distributed in the outdoor refrigerant condenser 15, the accumulator 16 and various refrigerant pipes connecting them is Compressor
In operation 13, the refrigerant is sucked and recovered, and all the refrigerant is pumped up to the refrigerant heater through the third check valve 17.
After this recovery operation is completed, the compressor 6 is stopped, the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 3, the fourth solenoid valve 5, and the opening / closing valve 4 are closed, and the heating operation state is restored.

As described above, during the heating operation, the heating cycle is configured by dropping the refrigerant liquid by utilizing the increase of the evaporation pressure due to the heating of the refrigerant, and it is necessary to operate the compressor or pump using electricity as in the past. The heating operation is performed without doing so.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the configuration described above, the refrigerant collected in the heater at the end of the heating operation gradually leaks to the compressor, the accumulator, and the outdoor refrigerant condensation during the heating operation stop, so that the heating The amount of refrigerant in the cycle will decrease. When the heating operation is performed while the amount of the refrigerant is insufficient, there is a problem that the temperature of the heater rises abnormally and the pipe pressure rises, which causes a dangerous state for the equipment.

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

Means for Solving the Problems In order to solve the above problems, the air conditioner of the present invention has a timer for measuring the operation time of the recovery operation unit, and a determination signal for determining that the measurement time of the timer has passed a predetermined time. It is configured to have a first determination unit for outputting and a second determination unit for instructing the heating operation unit to operate when the temperature detection means in the carburetor exceeds a predetermined temperature after the determination signal is input.

Action According to the present invention, with the above-described configuration, the determination signal is output by the first determination unit when the operation time of the recovery operation unit has passed the predetermined time. After the input of this determination signal, the temperature of the inside of the carburetor rises due to the action of the vaporization heater, and when the temperature detected by the temperature detection means exceeds a predetermined temperature, the second determination unit gives an operation instruction to the heating operation unit.

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. 7 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 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 is a configuration diagram of the control unit 23. 24 is a switch for switching start / stop of 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 timer that measures the operation time of the recovery operation unit 26,
Reference numeral 28 denotes a first determination unit that outputs a determination signal when the timer 27 has passed a predetermined time, and reference numeral 29 denotes a second determination unit that instructs the heating operation unit 25 to start operation when the temperature detected by the temperature detection means 8 exceeds a predetermined temperature. Is a vaporization heater control.

The operation of the control unit 23 will be described with reference to FIGS. 3 and 4. 3 and 4, T is the temperature of the vaporizer 18 indicated by the temperature detecting means 8, T _S is the predetermined temperature shown in the claims, and T _OFF and T _ON are vaporized by the vaporization heater controller 30. It is the temperature at which the energization state of the heater 18 is changed, and T _ON <T _S <T _OFF . When the user turns on the switch 24 at the start of the heating operation, the recovery operation unit 26 drives the recovery means 22 to start the recovery operation, and the timer 27 starts measuring the operation time of the recovery operation unit 26. Further, at this time, power supply to the vaporization heater 19 is started. Until the timer 27 measures a predetermined time, the vaporization heater 18 is controlled as follows. That is, once the energization is started, the energization is maintained until the temperature inside the carburetor 18 exceeds T _OFF . Temperature inside vaporizer 18 is T _OFF
When it exceeds, the energization is stopped and the energization is not resumed until T _ON is exceeded.

Next, the operation after the measurement value of the timer 27 has finished measuring the predetermined temperature will be described. At this point, it was determined that the recovery of the refrigerant required for heating operation was completed,
A determination signal is output by the first determination unit 28. When this determination signal is input, the vaporization heater control unit 30 starts energizing the vaporization heater 18. In other words, even if the vaporization heater 18 has been de-energized until just before the determination signal is output,
At this point, energization is started. In addition, the second determination unit 29,
After inputting a determination signal, a predetermined temperature the temperature in the vaporizer is T _S
The judgment of whether or not to exceed is started. When the temperature inside the carburetor 18 exceeds T _S , it is determined that combustion is possible, and the second determination unit 29
Instructs the heating operation unit 25 to start the operation, and the heating operation is started, and the driving of the collection operation unit 26 is stopped. When the heating operation is started as described below, the recovery operation is always performed for a predetermined time, so that the heating operation can be started after securing the required amount of refrigerant in the heating device 6.

Here, the effect of starting energization of the vaporization heater 19 at the same time when the determination signal of the first determination unit 28 is output will be described. FIG. 5 is a diagram showing the relationship between the temperature in the vaporizer 18 and the energization state of the vaporization heater 19. In the graph of FIG. 5, the solid line indicates the present embodiment, and the broken line indicates the relationship between the time and the temperature inside the vaporizer when the vaporization heater 19 is controlled according to the temperature inside the vaporizer at the time of outputting the determination signal. There is. As shown in the figure, if the temperature inside the vaporizer exceeds T _OFF before the timer 27 finishes measuring the predetermined time, the vaporization heater 19 is de-energized. Therefore, after that, the temperature inside the carburetor 18 will decrease, but in the present embodiment, the timer 27
Since the energization is restarted at the time t ₁ when the counting of is finished, the heating operation start time T ₂ is the heating operation start time t 2 when the control of the vaporization heater 19 is provided by the temperature in the carburetor after the time t _1. Can be faster than ₂ '.

Next, another embodiment of the present invention will be described with reference to FIG. The first embodiment is different from the first embodiment in that
The point is that the recovery operation is terminated when the determination signal of the determination unit 28 is output, that is, at the end of the predetermined time. In this case, after the lapse of a predetermined time, with the driving of the recovery means 22 stopped, the vaporizer
Since it waits until the temperature inside 18 reaches the predetermined temperature T _S , compared with the previous embodiment, it is possible to reduce the power consumption amount accompanying the operation of the compressor 6 when the recovery means is driven. There is.

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

(1) Since the recovery operation is performed for a predetermined time before the heating operation is started, the heating operation can be started after the heat medium gradually leaking from the heating cycle is recovered while the heating operation is stopped. It is possible to perform a safe heating operation without causing an abnormal rise in the heating device due to the shortage of the heat medium and an abnormal rise in the refrigerant pipe pressure.

(2) Since the energization of the vaporization heater is always started when the recovery operation time reaches the predetermined temperature, the heating operation can be started up earlier.

[Brief description of drawings]

FIG. 1 is a block diagram of an air conditioner recovery system according to an embodiment of the present invention, FIG. 2 is a block diagram of the control unit, FIG. 3 is a flowchart explaining the function of the control unit, and FIG. 4 is temperature detection. FIG. 5 is a diagram showing the relationship between the temperature detected by the means and the timer and the operating states of the vaporization heater and the air conditioner, FIG. 5 is a diagram showing the relation between the control of the vaporization heater and the start time of the heating operation, and FIG. 6 is another implementation. FIG. 7 is a diagram showing the relationship between the detected temperature of the temperature detecting means and the timer, the operating state of the vaporization heater and the air conditioner in the example, and FIG. 7 is a circuit configuration diagram of a conventional air conditioner. 6 ... Heating device, 8 ... Heat exchanger, 18 ... Vaporizer, 19 ...
… Evaporation heater, 20 …… Operation detection means, 21 …… Heat transfer means, 22 …… Recovery means, 23 …… Control section, 25 …… Heating operation section, 26 …… Recovery operation section, 27 …… Timer, 28 ...... First judgment unit, 29 ...... Second judgment unit, 30 ...... Evaporation heater control unit.

Claims (1)

(57) [Claims] 1. A heating device 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 the temperature in the vaporizer. A heat exchanger that heats air by heat exchange with the heat medium; heat transfer means that circulates the heat medium in the heating device and the heat exchanger to perform heating; and recovers the heat medium to the heating device. A recovery unit, a controller for controlling 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 recovery unit, a timer that measures an operation time of the recovery operation unit, and a determination signal when the timer elapses a predetermined time. A first determination unit that outputs
After the input of the determination signal, a second determination unit for instructing the heating operation unit to start operation when the temperature detected by the temperature detection unit exceeds a predetermined temperature, and the energization to the vaporization heater is controlled by the temperature detected by the temperature detection unit. An air conditioner having a vaporization heater control unit that starts energization at the same time when the determination signal is input.