JP3708405B2 - Home appliances using flammable refrigerants - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to home appliances such as a refrigerator using a flammable refrigerant.
[0002]
[Prior art]
In recent years, from the viewpoint of protecting the ozone layer and preventing global warming, flammable HC systems have begun to be used as refrigerants. If this flammable refrigerant leaks from the refrigerant circuit, it may stay in the home appliance installation room, causing a risk of fire or explosion. Hereinafter, a refrigerator will be described as an example of a home appliance.
[0003]
In particular, it has been found that the explosion risk due to refrigerant leakage into the installation room greatly affects the refrigerant leakage speed through experiments and the like. According to this, in the case of a gradual leak with a low leak rate, the diffusion with the room air proceeds and the gas concentration is diminished, and the relationship between the volume in the installation room and the amount of refrigerant leakage that is normally considered does not fall within the explosion concentration range. However, if a large amount of flammable refrigerant, such as propane or butane, leaks in a short period of time exceeding a certain leak rate (hereinafter referred to as explosion hazard leak rate), the refrigerant will explode near the floor of the room. If an ignition source is present in the concentration range until it reaches the concentration below the lower explosion limit due to diffusion, there is a risk of explosion.
[0004]
The above description is shown by the experimental data in FIG. In the experiment, a gas concentration measuring sensor was installed in a large number so that the refrigerator was installed in the laboratory simulating the refrigerator installation room, the refrigerant was leaked from the refrigerator by changing the leakage rate, and the concentration could be measured accurately in the refrigerator installation room. The concentration was measured by
[0005]
FIG. 8 shows the indoor maximum concentration of the measured values of the gas concentration sensor as time elapses in an experiment in which the refrigerant was leaked by changing the leakage rate from the refrigerator. Usually, in the case of a refrigerant having a high specific gravity, the gas concentration is highest at a position close to the floor.
[0006]
In the figure, the vertical axis represents the gas concentration, and the horizontal axis represents the elapsed time from when the leak occurred. In the figure, 1 indicates the gas concentration at the lower limit of explosion, and the danger of explosion occurs above this line. 2 shows leakage data having a leakage rate when the maximum concentration point in the room is the same as the lower explosion limit. The leakage refrigerant amount at this time is divided by the leakage time indicated by T1 in the figure. The value obtained is the average explosion hazard leak rate.
[0007]
3 is the leak data when the leak rate is higher than the average explosion risk leak rate (leakage data 2), and 4 is the leak rate when the leak rate is lower than the average explosion risk leak rate (leakage data 2). This is leaked data. In the case of leak data 3 with a high leak rate, the time (indicated by T2 in the figure) at which the gas concentration at the lower explosion limit is 1 or more is the explosion danger time. In the case of leaked data 4 with a low leak rate, all are below the lower explosion limit and there is no danger of explosion.
[0008]
In this way, whether or not the refrigerant leaking into the room reaches a concentration having a risk of explosion is related to the leakage speed, and the explosion dangerous volume and the time when the refrigerant reaches the explosion concentration are proportional to the amount of refrigerant leaked. , Inversely proportional to the floor area or volume in the installation room.
[0009]
On the other hand, one of the causes of refrigerant leakage is poor brazing at the time of manufacturing the connection part in the refrigeration cycle. Because it leaks completely, there is no danger of explosion due to leakage into the installation room.
[0010]
Another cause of refrigerant leakage is due to the occurrence of punctures due to corrosion of the refrigeration cycle during use or stress cracks due to vibrations. Become.
[0011]
Now, the occurrence of refrigerant leakage during use is during operation and stoppage of the compressor. Since the leakage rate of the refrigerant depends on the pressure at the leakage point, the leakage rate when the compressor is stopped from the high-pressure side of the refrigeration cycle is lower than that during operation, so that the leakage rate becomes smaller. At the same time, even if it is stopped, the saturation pressure is lower than the atmospheric pressure because the atmosphere around the cooler in the refrigerator and the cooler are at a low temperature if it is within a time period that causes a sudden leak with an explosion risk. Thus, condensation of the refrigerant to the cooler also occurs at the same time, so that the amount of refrigerant leaked into the room is reduced. As a result, the risk of explosion due to refrigerant leakage into the installation room when the compressor is stopped is not problematic.
[0012]
On the other hand, when leaking from the high-pressure side during operation, the pressure is high especially in the early stage of the leak, so the leak rate is large, and the refrigerant on the low-pressure side is supplied to the high-pressure side by the compressor. The refrigerant will leak and there is a risk of explosion.
[0013]
Furthermore, refrigerant leakage into the refrigerator will be described. When leakage occurs during production, the cooler drain is discharged out of the chamber through a drain hole that discharges the drain of the cooler out of the chamber. The discharge speed varies depending on the position and shape of the drain hole, but if the installation period from the production to the place of use is set to several days, any leakage will cause the concentration within the chamber to be below the lower explosion limit. Conventionally used refrigerators have a discharge capacity that can be reduced.
[0014]
Furthermore, regarding in-compartment leakage during use, during operation, the refrigeration cycle provided in the interior is at a low pressure. For example, if isobutane is used as the refrigerant, the refrigerant will have a negative pressure and the refrigerant will not leak. In addition, during stoppage, refrigerant leakage can be prevented by partitioning the high pressure side and the refrigeration cycle by a partition valve or the like and maintaining a negative pressure.
Moreover, if it is in a store | warehouse | chamber, even if explosion danger arises by refrigerant | coolant leakage, explosion etc. can be prevented with conventional techniques, such as using an electric appliance used as an explosion-proof type.
[0015]
As explained above, the danger of an explosion due to refrigerant leakage in a refrigerator using a combustible refrigerant exceeds the explosion danger leakage rate from the high pressure side during compressor operation from the actual usage conditions and the estimated amount of refrigerant filling. It can be said that only sudden refrigerant leakage is the target.
[0016]
A conventional typical detection method for this refrigerant leakage uses a gas concentration sensor, but this requires maintenance to maintain long-term detection accuracy, and the sensor is expensive. There were some drawbacks.
[0017]
FIG. 9 is an electric circuit diagram showing a conventional refrigerant leakage detection method. In FIG. 9, 5 is an AC power source, 6 is a control circuit, 7 is a compressor switch, 8 is a compressor, and 9 is a current detector.
The conventional electric circuit configured as described above is connected to the AC power supply 5, the compressor switch 7 is turned on by the control circuit 6, and the compressor 8 is operated, but the compressor is operated by the current detector 9. The current is detected, and when the current is below the reference value, it is determined that the refrigerant is leaking, and the compressor is abnormally stopped.
[0018]
FIG. 10 shows a control flow of the control circuit in this case as shown in, for example, Japanese Patent Laid-Open No. 3-59371. In FIG. 10, when the operation stop command (step S1) indicates that the number of abnormal stops is 3 or less (C <3) in step S2, the compressor is started (step S3). After confirming the elapse of T time (usually 3 minutes) for checking the current stability (step S4), it is determined whether the operating current i is equal to or higher than the reference current I (step S5). If YES, the steady operation is continued. (Step S6), if NO, the compressor is stopped (Step S7), the number of stops is added (C = C + 1) (Step S8), 3 minutes after the stop is confirmed (Step S9), Step S2 Return to before restarting the compressor. If the stop of the compressor by the above control flow is repeated three times, step S2 becomes NO and abnormally stops (step S10).
[0019]
[Problems to be solved by the invention]
However, such a detection method is intended to prevent damage to the compressor or the like due to refrigerant leakage, and after detecting refrigerant leakage, it takes a long time of at least 12 minutes to abnormally stop, such as explosion There was a problem that proper preventive measures could not be taken for situations requiring emergency.
[0020]
In order to prevent dangers such as explosions due to leakage of these flammable refrigerants, refrigerant leaks with high leakage speed that may cause explosions, which were not possible with conventional technology, are detected accurately over a long period of time. Therefore, it is necessary to obtain an inexpensive explosive prevention means that is effective against an inexpensive detection function and particularly leakage into the room.
[0021]
The present invention has been made to solve such a problem, and in the event of refrigerant leaking from a household appliance such as a refrigerator using a flammable refrigerant, it avoids the risk of fire or explosion. is there.
[0022]
[Means for Solving the Problems]
A home appliance using a combustible refrigerant according to the present invention is composed of a compressor and the like, and controls a refrigeration cycle in which a flammable refrigerant is enclosed, a current detector for detecting an operating current of the refrigeration cycle, and a compressor operation. A control circuit that detects the leakage of a flammable refrigerant with a leak rate above a certain level that may cause an explosion or other hazard in the home appliance installation room. And refrigerant leakage detection means for detecting the amount by comparing the amount with a reference value obtained from an experiment or the like.
[0023]
Further, when the refrigerant leakage detection means detects the leakage of the combustible refrigerant having a leakage rate of a certain level or more, the compressor is stopped and an abnormality is notified.
[0024]
In addition, the stop time from the stop to the restart of the compressor is set to a predetermined time based on the indoor explosion danger time obtained from experiments or the like.
[0025]
Further, the amount of decrease in operating current per hour is detected by measuring the elapsed time with respect to the constant amount of decrease in operating current.
[0026]
The current detector is provided in the compressor current circuit.
[0027]
Further, the current detector is provided in all current circuits of the home appliance.
[0028]
In addition, an abnormality notification device that performs abnormality notification by sound or light is provided.
[0029]
In addition, it has a normal operation function and an emergency operation function with a larger air volume, and has a machine room fan placed in the machine room of home appliances where a compressor etc. is installed, and the refrigerant leak detection means has a leak rate above a certain level When the leakage of the flammable refrigerant having is detected, the compressor is stopped and the emergency operation function of the machine room fan is activated.
[0030]
Moreover, the outlet outlet provided in the outer part of the home appliance, the manual switch for turning on / off the power to the outlet outlet, and the switch provided in parallel with the manual switch for turning on / off the power to the outlet outlet And the refrigerant leakage detection means detects the leakage of the flammable refrigerant having a leakage rate higher than a certain level, and stops the compressor and activates the switch.
[0031]
Moreover, the indoor ventilator is connected to the outlet outlet.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below in detail with reference to the drawings.
1 to 3 are diagrams showing Embodiment 1, FIG. 1 is an electric circuit diagram of a refrigerator, FIG. 2 is a graph showing a time course of compressor operating current in a refrigerant leakage experiment of a refrigerator using a combustible refrigerant, and FIG. It is a refrigerator control flowchart.
In FIG. 1, reference numerals 5 to 9 are the same as those shown in the prior art. Reference numeral 10 denotes an abnormality notification device, which has a function of notifying abnormality by light or sound upon detection of refrigerant leakage.
[0033]
In FIG. 2, the vertical axis indicates the operating current, and the horizontal axis indicates the elapsed time after the start of leakage. In the figure, reference numeral 11 is a line showing the elapsed time of the operating current. When refrigerant leakage starts from the high pressure side of the refrigeration cycle during compressor operation, the leakage continues until the high pressure becomes equal to the atmospheric pressure (T1 in the figure is the leakage time), and the amount of refrigerant enclosed in the refrigeration cycle decreases. Thus, the operating pressure decreases with time, and the operating current decreases as the operating pressure decreases.
[0034]
In the figure, reference numeral 12 denotes a reference value for determining the conventional refrigerant leakage, and is set to a value that does not make an erroneous determination in consideration of the ambient temperature of the refrigerator during operation. In such a refrigerant leakage speed, T3 in the figure is the first detection time, and according to the conventional control flowchart in FIG. Minutes (T3 + 12 minutes from the start of leakage) are required.
[0035]
Here, a refrigerant leakage that causes an indoor explosion risk obtained in advance through experiments or the like is detected by detecting a decrease in operating current per unit time (ΔT) (Δi = ia−ib), that is, Δi / ΔT by the timer function and the current detector 9. By comparing with the permissible value of the speed Δi / ΔT, it is possible to reliably detect the refrigerant leakage much faster than the detection time based on the conventional reference value.
[0036]
In FIG. 3, according to the operation start command (step S11), if the number of abnormal stops in step S12 is 2 or less (C <2) and the abnormality notification is activated, the abnormality notification is canceled (step S13), Start the compressor. After confirming the elapse of T4 time (usually 3 minutes or less) for checking the current stability (step S15), the current decrease amount Δi / ΔT per time is larger than the reference value K obtained from the explosion dangerous leakage speed, or It is determined whether the operating current i is greater than or equal to the reference current I (step S16). If YES, the steady operation is continued (step S17). If NO, the compressor is stopped (step S18), and at the same time, an abnormality is notified. Perform (step S19). Further, the number of stops is added (C = C + 1) (step S20). After confirming that the predetermined stop time T5 has elapsed (step S21), the process returns to step S12 and restarts the compressor. If the stop of the compressor by the above control flow is repeated twice, step S12 becomes NO, abnormally stops (step S22), and cannot be automatically restored.
[0037]
The predetermined stop time T5 is a value set on the basis of the explosion possible time under the worst condition predicted from the refrigerant filling amount of the refrigerator, the volume of the installation room, the refrigerant leakage speed, the stirring effect of the machine room fan, and the like. is there.
[0038]
Normally, the operating current is always affected by the ambient temperature of the refrigerator and the clogging of the decompression device at that time, so it is necessary to take a sufficiently small value to prevent erroneous detection, so that the conventional reference value includes such variations. It takes time.
[0039]
However, according to the refrigerant leakage detection function of the present invention configured as described above, the conventional current detector is used as it is, and the operating current reduction amount (Δi) per hour (ΔT) by the timer function and the current detector 9 is used. = Ia−ib), that is, Δi / ΔT is detected, and the conventional reference value is obtained only by changing the detection method of detecting Δi / ΔT and comparing it with the allowable value of Δi / ΔT of the refrigerant leakage rate at which an indoor explosion risk is obtained in advance through experiments. Refrigerant leakage can be detected reliably at a low cost, much faster than the detection time.
[0040]
In addition, the refrigerant leakage detection function of the present invention always checks the amount of decrease in operating current per hour in contrast to the conventional refrigerant leakage detection based on a sufficiently small value so as not to detect the above. The influence of use conditions such as clogging of the decompression device can be offset, and only the influence of refrigerant leakage on the operating current can be confirmed, so that more accurate and faster detection is possible.
[0041]
Further, if the detection of Δi / ΔT is made a method of measuring the elapsed time with respect to a constant operating current reduction amount, there is a feature that a refrigerant leak with a higher leakage rate with a higher explosion risk can be detected in an earlier time.
[0042]
In addition, the first detection alerts you to an explosion hazard due to an abnormal alarm, enabling you to avoid or evacuate explosion hazards such as ventilation at an early stage, and keep the indoor gas concentration below the lower explosion limit. By restarting the compressor after the decreasing predetermined stop time T5, it is possible to avoid an explosion danger due to operation and to avoid operation stop due to an erroneous detection.
[0043]
In the above embodiment, the operating current detector is installed in the compressor current circuit. However, the same effect can be expected even if the detector is installed in all the current circuits of the refrigerator including the compressor operating current.
[0044]
Embodiment 2. FIG.
The second embodiment of the present invention will be described below in detail with reference to the drawings.
4 and 5 are diagrams showing Embodiment 2, FIG. 4 is an electric circuit diagram of the refrigerator, and FIG. 5 is a control flowchart of the refrigerator.
In FIG. 4, the AC power source 5, the control circuit 6, the compressor switch 7, the compressor 8, and the current detector 9 are the same as those of the conventional refrigerator in FIG. 13 is a machine room fan, 14 is a contact point of a normal operation switch of the machine room fan, 15 is a contact point of an emergency operation switch configured in parallel with a contact of the normal operation switch 14 of the machine room fan, Both operate according to the command of the control circuit. The machine room fan 13 is placed in a refrigerator machine room in which a compressor or the like is installed, and is set to operate at a larger air volume than that during normal operation during emergency operation.
[0045]
5, steps S11, S12, S14 to S18, and S20 to S22 are the same as those in FIG. 3 of the first embodiment.
In the figure, step S24 is a switch to the emergency operation of the machine room fan 13, which is performed simultaneously with the compressor stop (step S18) after detection of refrigerant leakage with an explosion risk up to step S16 shown in FIG. It is.
[0046]
In step S23, when the compressor is stopped (step S18) and the machine room fan emergency operation is switched (step S24), and the compressor is restarted (step S14) after a predetermined stop time T5 has elapsed (step S21), the machine room is in advance. The fan 13 is switched to normal operation.
[0047]
In the present embodiment thus configured, the atmosphere in the refrigerator installation room is agitated by operating the machine room fan 13 in an emergency operation mode with a larger air volume than during normal operation upon detection of refrigerant leakage with an explosion risk. And the risk of explosion can be greatly reduced by preventing the leakage refrigerant from reaching the dangerous explosion concentration or allowing it to diffuse below the dangerous explosion concentration in a short time.
[0048]
In addition, the stirring of the atmosphere in the refrigerator installation room is promoted, and the predetermined stop time T5 until the restart after the abnormal stop of the compressor can be further shortened, so that the rise in the internal temperature when the compressor is stopped can be minimized. Become.
[0049]
Embodiment 3 FIG.
Embodiment 3 of the present invention will be described below in detail with reference to the drawings.
6 and 7 are diagrams showing Embodiment 3, FIG. 6 is an electric circuit diagram of the refrigerator, and FIG. 7 is a control flowchart of the refrigerator.
In FIG. 6, the AC power source 5, the control circuit 6, the compressor switch 7, the compressor 8, and the current detector 9 are the same as those of the conventional refrigerator in FIG. Reference numeral 16 denotes an outlet outlet installed in the outer portion of the refrigerator, 17 is a manual switch for turning on and off the outlet outlet, 18 is configured in parallel with the outlet circuit manual switch 17, and similarly to the outlet outlet 16. It is a contact of a switch for turning on and off the current. The outlet circuit switch 18 performs an on / off operation in response to a command from the control circuit.
[0050]
In FIG. 7, steps S11, S12, S14 to S18, and S20 to S22 are the same as those in FIG. Step S26 is an outlet circuit switch ON, which is performed simultaneously with the compressor stop (step S18) after detection of the refrigerant leakage with danger of explosion up to step S16 shown in FIG. In step S25, the outlet switch 18 is turned off. When the compressor is restarted (step S14) after a predetermined stop time T5 has elapsed (step S21), the outlet circuit switch 18 is turned off in advance.
[0051]
In this embodiment configured as described above, a device that can ventilate an indoor atmosphere such as a ventilating fan placed in a refrigerator installation room such as a kitchen is normally connected to the outlet outlet 16 installed in the outer portion of the refrigerator. In the case of detecting a refrigerant leak that has a risk of explosion, a ventilator fan that is normally turned on and off by a manual switch installed in the outer part of the refrigerator should automatically turn on the outlet circuit switch 18 and operate it. This makes it possible to ventilate the interior atmosphere of the refrigerator, and to greatly reduce the risk of explosion.
[0052]
In the above-described embodiment, the refrigerator has been described as an example, but the same applies to household appliances such as an air conditioner and a dehumidifier that use a flammable refrigerant.
[0053]
【The invention's effect】
The household electric appliance using the flammable refrigerant according to the present invention has an operating current per hour in which leakage of the flammable refrigerant having a leakage rate of a certain level or more that has a possibility of causing an explosion or the like in the electric appliance installation chamber is detected. By detecting the amount of decrease by comparing it with a reference value obtained from an experiment or the like, it is possible to detect the refrigerant leakage by an inexpensive and highly accurate detection method, and to detect the danger earlier.
[0054]
In addition, if the refrigerant leak detection means detects a leak of flammable refrigerant with a leak rate above a certain level, the compressor will be stopped and an abnormality will be notified. Can be applied.
[0055]
In addition, by setting the stop time from the compressor stop to restart as a predetermined time based on the indoor explosion danger time obtained from experiments etc., the risk of explosion due to restart is avoided and trouble due to false detection Can be avoided.
[0056]
In addition, by detecting the amount of decrease in operating current per hour by measuring the elapsed time for a certain amount of decrease in operating current, it is possible to detect refrigerant leaks with a higher explosion risk and a greater leak rate in a shorter time. Become.
[0057]
Further, the current of the compressor can be directly detected by providing the current detector in the compressor current circuit.
[0058]
Moreover, the current of the compressor can be detected even if the current detector is provided in all current circuits of the home appliance.
[0059]
In addition, by providing an abnormality notification device that performs abnormality notification by sound or light, it is possible to quickly recognize the danger and take measures to avoid danger such as explosion.
[0060]
In addition, it has a normal operation function and an emergency operation function with a larger air volume, and has a machine room fan placed in the machine room of home appliances where a compressor etc. is installed, and the refrigerant leak detection means has a leak rate above a certain level If a leak of flammable refrigerant with a detected value is detected, the compressor is stopped and the emergency operation function of the machine room fan is activated to promote the diffusion of the indoor atmosphere and to avoid dangers such as explosions earlier. it can.
[0061]
In addition, when the refrigerant leak detection means detects the leakage of a flammable refrigerant having a leak rate higher than a certain level, the compressor is stopped and a switch that turns on / off the outlet outlet is operated to Risk can be avoided earlier.
[0062]
In addition, by connecting the indoor ventilator to the outlet outlet, the indoor ventilator can be automatically operated, thereby ventilating the indoor atmosphere and avoiding dangers such as explosions more quickly. .
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment and is an electric circuit diagram of a refrigerator.
FIG. 2 is a diagram showing the first embodiment, and is a diagram showing a time course of compressor operating current in a refrigerant leakage experiment of a refrigerator using a combustible refrigerant.
FIG. 3 shows the first embodiment and is a control flowchart of the refrigerator.
FIG. 4 is a diagram showing a second embodiment and is an electric circuit diagram of a refrigerator.
FIG. 5 is a diagram showing the second embodiment and is a control flowchart of the refrigerator.
FIG. 6 is a diagram showing a third embodiment and is an electric circuit diagram of a refrigerator.
FIG. 7 is a diagram showing the third embodiment and is a control flowchart of the refrigerator.
FIG. 8 is a diagram showing the indoor maximum concentration as a function of time among the measured values of the gas concentration sensor in an experiment in which the refrigerant was leaked from the refrigerator by changing the leakage rate.
FIG. 9 is an electric circuit diagram of a conventional refrigerator.
FIG. 10 is a control flowchart of a conventional refrigerator.
[Explanation of symbols]
5 AC power supply, 6 Control circuit, 8 Compressor, 9 Current detector, 10 Abnormality alarm device, 13 Machine room fan, 14 Switch for normal operation of machine room fan, 15 Switch for emergency operation of machine room fan, 16 Outlet outlet, 17 outlet circuit manual switch, 18 outlet circuit switch.

Claims (10)

A refrigeration cycle composed of a compressor and the like, and enclosing a combustible refrigerant
A current detector for detecting the operating current of the refrigeration cycle;
A control circuit for controlling the operation of the compressor;
Based on experiments, the amount of decrease in operating current per hour when leakage of flammable refrigerant with a leak rate above a certain level that could cause danger such as explosion in the interior of home appliances was detected in this control circuit. Refrigerant leakage detection means for detecting by comparing with the obtained reference value,
A home appliance that uses a flammable refrigerant. 2. The household appliance using combustible refrigerant according to claim 1, wherein when the refrigerant leakage detection unit detects leakage of a combustible refrigerant having a leak rate of a certain level or more, the compressor is stopped and an abnormality is notified. machine. 3. The household electrical appliance using combustible refrigerant according to claim 2, wherein the stop time from the stop to the restart of the compressor is a predetermined time based on an indoor explosion danger time obtained from an experiment or the like. The household electric appliance using a combustible refrigerant according to claim 1, wherein the amount of decrease in operating current per hour is detected by measuring an elapsed time with respect to a constant amount of decrease in operating current. 2. The home appliance using a combustible refrigerant according to claim 1, wherein the current detector is provided in a compressor current circuit. 2. The household electrical appliance using flammable refrigerant according to claim 1, wherein the current detector is provided in an all current circuit of the household electrical appliance. The home appliance using a combustible refrigerant according to claim 2, further comprising an abnormality notification device for performing abnormality notification by sound or light. It has a normal operation function and an emergency operation function with a larger air volume, and has a machine room fan placed in the machine room of a household electrical appliance in which a compressor or the like is installed. 2. The home appliance using the combustible refrigerant according to claim 1, wherein when the leakage of the combustible refrigerant is detected, the compressor is stopped and the emergency operation function of the machine room fan is activated. Outlet outlets provided in the outer part of home appliances,
A manual switch that turns on and off the power to the outlet outlet,
A switch that is provided in parallel with the manual switch, and that turns on and off the outlet outlet;
2. The combustible according to claim 1, wherein the compressor is stopped and the switch is operated when the refrigerant leakage detection means detects leakage of a flammable refrigerant having a leakage rate of a certain level or more. Appliances that use a functional refrigerant. The household electrical appliance using a combustible refrigerant according to claim 9, wherein an indoor ventilator is connected to the outlet outlet.

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