JP5137726B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner that can replace (replace) at least one of a new heat-source side unit or a load-side unit using existing refrigerant piping, and in particular, contaminant removal that performs contaminant removal during replacement. The present invention relates to an air conditioner provided with a mechanism.

  Conventionally, there is an air conditioner that can replace a refrigerant by using an existing refrigerant pipe as it is. In such an air conditioner, it is only necessary to replace at least one of the heat source side unit (outdoor unit) or the load side unit (indoor unit) with a new heat source side unit or load side unit. This saves labor, cost and time. In addition, since the refrigerant pipe replacement work is unnecessary, a large construction of the building in which the air conditioner is installed is not necessary, and the reliability of the air conditioner is improved.

  As such, “When the working refrigerant is changed from an old refrigerant containing chlorine to a new refrigerant that does not contain chlorine, the outdoor unit and indoor unit are replaced with equipment compatible with the new refrigerant. When diverting what was being used, the compressor and the outdoor heat exchanger and the indoor heat exchanger are connected to each other by the gas side extension pipe and the liquid side extension pipe of the refrigerant pipe. In addition, a refrigeration air conditioner in which chloride recovery means for removing chloride is provided in a pipe through which liquid refrigerant flows between an outdoor unit heat exchanger and an indoor unit heat exchanger has been proposed (see, for example, Patent Document 1). ).

Japanese Patent No. 3855884 (page 5-7, Fig. 1)

  The refrigerating and air-conditioning apparatus described in Patent Document 1 targets a refrigerant that does not contain chlorine, such as R410A, as a new refrigerant after replacement. Such a refrigerant has an ozone depletion coefficient of zero and has been considered suitable for global environmental conservation. However, some of the refrigerants that do not contain chlorine have a large global warming potential. Therefore, alternatives are being desired from the viewpoint of further global environmental conservation. As an example of a refrigerant having a small global warming potential, a hydrofluorocarbon refrigerant containing a double bond in the molecule (for example, 2,3,3,3-tetrafluoropropene) has been proposed.

However, a hydrofluorocarbon having a double bond in the molecule is poor in chemical stability as compared with a saturated hydrofluorocarbon. For example, hydrofluorocarbons with double bonds in the molecule are chemically similar to aldehydes and ketones with poor chemical stability due to the large electronegativity of fluorine when fluorine is unevenly distributed on one side across the double bond. It comes with nature. For this reason, it is conceivable that the hydrofluorocarbon having such a double bond in the molecule reacts with water or the like and deteriorates to produce alcohol (see Reaction Formula 1).

Such alcohol reacts with iron chloride, which is a Lewis acid (in the following description, a reaction product of alcohol and iron chloride may be referred to as an acid-base reaction product). For this reason, it is considered that the generated acid-base reaction product has a molecular weight larger than that of iron chloride while maintaining the same structure as iron chloride at the terminal (see Reaction Formula 2). Note that iron chloride is generated in the refrigerant pipe when an old refrigerant containing chlorine is used, and remains in the refrigerant pipe after replacement.

  It is known that ferric chloride (III) (hereinafter simply referred to as iron chloride) is deliquescent and easy to make hydrates. Since the molecular weight of iron chloride is 163 (253 if it is pentahydrate), even if iron chloride is a hydrate, it could be removed by the refrigeration air conditioner described in Patent Document 1. However, in the case of an acid-base reaction product, the molecular weight is 293 when it is not hydrated at all. However, when water is coordinated in the vicinity of iron chloride to form a monohydrate, the molecular weight becomes 311. The refrigeration air conditioner described in Document 1 cannot be removed.

In addition, there is a possibility that a compound containing large molecular weight iron chloride as a part of the structure is generated by a reaction different from the reaction described in the above formula. For example, it is considered that iron chloride acts as a cationic polymerization initiator, and a hydrofluorocarbon having a double bond is polymerized by cationic polymerization, resulting in a compound having a large molecular weight (see Reaction Formula 3, see this reaction product). In the following description, it may be referred to as a cationic polymerization product). In this case, if the cationic polymerization product is a monomer, the molecular weight is 277.5 and is within the range of the refrigerating and air-conditioning apparatus described in Patent Document 1, but if it is a dimer, the molecular weight is 391.5. The refrigerating and air-conditioning apparatus described in Patent Document 1 cannot be removed.

  Such a chemical reaction does not occur in a hydrofluorocarbon that does not contain a double bond that has been used as a refrigerant. For this reason, conventionally, it has only been necessary to consider removing the refrigerant oil for refrigerant containing iron chloride or chlorine at the time of replacement. Iron chloride remarkably accelerates the deterioration of refrigerating machine oil and causes sludge generation. The generated sludge causes the refrigerant piping to be blocked. Chlorine ions also deteriorate the sliding state due to copper plating or the like.

  The refrigerating and air-conditioning apparatus described in Patent Document 1 is a reaction product (acid-base reaction product) of alcohol and iron chloride generated by deterioration of refrigerant in order to remove iron chloride having a molecular weight of 150 to 300 using activated carbon. ) Or, the hydrofluorocarbon polymerization products having a double bond initiated by iron chloride (cationic polymerization products) all have iron chloride as part of the structure of the reaction product, from the viewpoint of sludge reduction. Despite the necessity of removal, these compounds cannot be removed.

  The present invention has been made to solve the above-described problems, and is generated when a refrigerant having a small global warming potential (for example, a hydrofluorocarbon-based refrigerant containing a double bond in a molecule) is used. An object of the present invention is to provide an air conditioner that can effectively remove contaminants.

  In the air conditioner according to the present invention, the working refrigerant is changed from an old refrigerant containing chlorine to a hydrofluorocarbon refrigerant containing a double bond, and when the refrigerant pipe used for the old refrigerant is diverted, the molecular weight is reduced. Iron chloride recovery means having fine pores formed on the surface capable of adsorbing 300 or more substances is provided in a pipe through which liquid refrigerant flows between the outdoor heat exchanger and the indoor heat exchanger, and corresponds to the hydrofluorocarbon refrigerant. The iron chloride that dissolves and flows in the refrigerating machine oil and the reaction product of the hydrofluorocarbon refrigerant are adsorbed and recovered by the iron chloride recovery means.

  With the air conditioner according to the present invention, iron chloride remaining in the refrigerant pipe can be effectively adsorbed and recovered. Further, iron chloride having an increased molecular weight due to the polymerization reaction of a hydrofluorocarbon-based refrigerant containing a double bond as a reaction initiator can also be effectively adsorbed and recovered. Furthermore, according to the air conditioning apparatus of the present invention, iron chloride can be effectively removed, so that reliability is not lowered.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram showing a circuit configuration of an air-conditioning apparatus 100 according to Embodiment 1 of the present invention. Based on FIG. 1, the circuit configuration of the air conditioning apparatus 100 will be described. The air conditioner 100 is installed in a building, a condominium, or the like, and performs a cooling operation or a heating operation by using a refrigeration cycle that circulates a refrigerant. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. In addition, as a premise for explanation, the old refrigerant is R22, the new refrigerant is tetrafluoropropene, the old refrigerator oil is mineral oil, and the new refrigerator oil is ester oil.

  As shown in FIG. 1, the air conditioning apparatus 100 includes an outdoor unit X and an indoor unit Y. And the outdoor unit X and the indoor unit Y are connected and communicated by the liquid side refrigerant | coolant piping 5 and the gas side refrigerant | coolant piping 6 which are refrigerant | coolant piping which can respond to an old refrigerant | coolant and a new refrigerant | coolant. The outdoor unit X is an outdoor unit compatible with a new refrigerant, and has a function of supplying cold heat to the indoor unit Y through the liquid side refrigerant pipe 5 or the gas side refrigerant pipe 6. The indoor unit Y is an indoor unit compatible with a new refrigerant and is installed in a room or the like having an air conditioning target area. The indoor unit Y is supplied from the outdoor unit X and uses cooling heat to supply cooling air or heating air to the air conditioning target area. It has a function to supply. Hereinafter, the configuration and function of each component device will be described.

[Outdoor unit X]
In the outdoor unit X, a compressor 1, a four-way valve 7 that is a flow path switching unit, an outdoor heat exchanger 2, and a decompression unit 3 are connected and connected in series through a main pipe 9. Further, the outdoor unit X is equipped with a bypass circuit unit Z ₁ . This bypass circuit unit Z ₁ is configured by connecting iron chloride recovery means 10, a first on-off valve 11a, and a second on-off valve 11b in series by a bypass pipe 13 which is a refrigerant pipe. The bypass pipe 13 connects the refrigerant flow before and after the decompression means 3 so that the iron chloride recovery means 10 is in parallel with the decompression means 3, that is, so as to bypass the decompression means 3. The iron chloride recovery means 10 is provided between the first on-off valve 11a and the second on-off valve 11b so as to be in parallel with the decompression means 3.

  The compressor 1 sucks refrigerant and compresses the refrigerant to a high temperature / high pressure state. For example, the compressor 1 may be of a type in which the rotation speed is controlled by an inverter and the capacity is controlled. The four-way valve 7 switches the refrigerant flow during the heating operation and the refrigerant flow during the cooling operation. The outdoor heat exchanger 2 functions as an evaporator during heating operation, functions as a condenser during cooling operation, and performs heat exchange between air supplied from a blower such as a fan (not shown) and a refrigerant, and the refrigerant. Is vaporized or condensed and liquefied. The decompression means 3 functions as a fully-closed decompression valve and an expansion valve, and decompresses the refrigerant to expand it. The decompression means 3 may be composed of a variable opening, for example, an electronic expansion valve.

[Bypass circuit unit Z ₁ ]
The bypass circuit unit Z ₁ has a function of collecting and removing contaminants mixed in the refrigeration cycle constituted by the liquid side refrigerant pipe 5, the gas side refrigerant pipe 6 and the main pipe 9. The iron chloride recovery means 10 recovers contaminants from the refrigerant introduced into the bypass pipe 13 (described in detail in FIG. 2). First on-off valve 11a and the second on-off valve 11b is to perform a continuity and interruption of the refrigerant to the bypass circuit unit Z ₁ by being on-off controlled. That is, the air conditioner 100 controls the opening / closing of the first opening / closing valve 11a and the second opening / closing valve 11b and the opening degree of the decompression means 3 so that the refrigerant is conducted to the bypass pipe 13 and the iron chloride recovery means. 10 can block contaminants.

[Indoor unit Y]
An indoor heat exchanger 4 is mounted on the indoor unit Y. The indoor heat exchanger 4 functions as a condenser during the heating operation, functions as an evaporator during the cooling operation, and is supplied with air supplied from a blower such as a fan (not shown) and the liquid-side refrigerant pipe 5 or the gas-side refrigerant pipe 6. Heat is exchanged with the refrigerant supplied from the outdoor unit X through the air to create heating air or cooling air to be supplied to the air-conditioning target area.

  FIG. 2 is a longitudinal sectional view showing an example of a schematic internal configuration of the iron chloride recovery means 10. FIG. 3 is a graph showing the relationship between the pore diameter of activated carbon and its cumulative distribution. FIG. 4 is a longitudinal sectional view showing another example of the schematic internal configuration of the iron chloride recovery means 10. The iron chloride recovery means 10 will be described in detail based on FIGS. In FIG. 3, the vertical axis represents the cumulative pore volume distribution, and the horizontal axis represents the pore diameter (nm). In FIG. 3, activated carbon having a cumulative pore volume of 50% or more with a line (A) having a pore diameter of 1 nm to 3 nm or less, and a cumulative pore having a pore diameter of 3 nm or more and 50% or more with a line (B). The activated carbon having a volume and the activated carbon having a cumulative pore volume of 90% or more with a line (C) having a pore diameter of 1 nm to 10 nm are shown.

  As shown in FIG. 2, the iron chloride recovery means 10 has a configuration in which a main body 30 is provided with two mesh retaining plates 31, a first activated carbon 32, and a second activated carbon 33. The mesh retaining plate 31 forms a space for housing the first activated carbon 32 and the second activated carbon 33 in the main body 30. The first activated carbon 32 and the second activated carbon 33 are separated or mixed in the space partitioned by the mesh retaining plate 31 and stored. Here, the first activated carbon 32 is a first recovery means that can adsorb a substance such as a compound having a molecular weight of 150 to 300, and the second activated carbon 33 is a second recovery means that can adsorb a substance having a molecular weight of 300 or more.

  As a result of investigating activated carbon stored in the iron chloride recovery means 10, activated carbon capable of adsorbing a substance having a molecular weight of 150 to 300 has a pore diameter shown by a line (A) in FIG. It had a pore volume distribution. The activated carbon capable of adsorbing a substance having a molecular weight of 300 or more is preferably activated carbon having pores larger than the activated carbon shown by the line (A) in FIG. 3, for example, 50% over 3 nm shown by the line (B) in FIG. Activated carbon having the above cumulative pore volume distribution is good. Therefore, such activated carbon may be used as the first activated carbon 32 and the second activated carbon 33, respectively. That is, the first activated carbon 32 can adsorb unreacted iron chloride and mineral oil, and the second activated carbon 33 can adsorb iron chloride reacted with alcohol.

  Further, the pore diameter as shown in FIG. 1 (C) has a wide distribution having a cumulative pore volume distribution of 90% or more in 1 nm to 10 nm, and as a result, a substance having a molecular weight of 150 to 300 The same effect can be obtained even if it can adsorb together with 300 or more substances. When this activated carbon is applied to the first activated carbon 32 and the second activated carbon 33, the same activated carbon is accommodated in the iron chloride recovery means 10. In addition, when using the activated carbon of the line (A) and line (B) shown in FIG. 3, you may store and use the 1st activated carbon 32 and the 2nd activated carbon separately as shown in FIG. As shown in FIG. 4, a mixture (activated carbon 34) obtained by mixing the first activated carbon 32 and the second activated carbon 33 may be accommodated and used.

The purpose of iron chloride recovery will be described.
Since the existing refrigerant pipes (the liquid side refrigerant pipe 5 and the gas side refrigerant pipe 6) are all used in the old refrigerant, the old refrigerant, the old refrigerating machine oil, the chloride compound, the sulfur compound, etc. remain in the refrigerant pipe. Among these substances, a problem substance is a chlorinated compound (particularly, iron chloride). Iron chloride generates a metal salt of fatty acid (sludge, that is, a precipitate from oil that forms a very fine solid liquid slurry) by the following reaction, or a new refrigerant for a new refrigerant that does not contain chlorine. Refrigerator oil is decomposed and deteriorated, and in particular, its lubricity is reduced to cause wear of the sliding portion of the compressor. That is, the remaining iron chloride is recovered in order to avoid a decrease in the reliability of the air conditioner 100.

Here, the iron chloride recovery procedure will be specifically described.
Here, the iron chloride recovery procedure will be specifically described by taking as an example the replacement from the old refrigerant-compatible machine to the new refrigerant-compatible machine. At the time of iron chloride recovery, first, the old refrigerant is recovered to the outdoor heat exchanger 2 by a pump-down operation from the refrigerant circuit configured by the old refrigerant-compatible machine. Thereafter, the outdoor unit and the indoor unit corresponding to the old refrigerant are removed from the liquid side refrigerant pipe 5 and the gas side refrigerant pipe 6. Next, the outdoor unit X and the indoor unit Y corresponding to the new refrigerant are connected to the liquid side refrigerant pipe 5 and the gas side refrigerant pipe 6. And the liquid side refrigerant | coolant piping 5, the gas side refrigerant | coolant piping 6, the indoor unit Y, and the iron chloride collection | recovery means 10 are evacuated. Tetrafluoropropene, which is a new refrigerant, is one type of hydrofluorocarbon refrigerant that contains a double bond in the molecule.

Next, the new refrigerant sealed in the outdoor unit X is discharged to the liquid side refrigerant pipe 5, the gas side refrigerant pipe 6, the indoor unit Y, and the iron chloride recovery means 10. In addition, when the liquid side refrigerant | coolant piping 5 and the gas side refrigerant | coolant piping 6 are long and an additional filling is required, an additional filling is carried out at this stage. The state at this time is a state shown in FIG. 5 described below. As will be described in more detail in FIG. 5, the case of conducting the new refrigerant to the bypass circuit unit Z ₁ is a first on-off valve 11a and the second on-off valve 11b is opened, and the pressure reducing means 3 is fully closed Shall be kept.

  FIG. 5 is an explanatory diagram for explaining the flow of the new refrigerant during the iron chloride recovery operation. Based on FIG. 5, the procedure at the time of iron chloride recovery operation will be described. In FIG. 5, the arrow on the refrigerant circuit indicates the flow of the new refrigerant, the solid line arrow indicates the high pressure side, and the broken line arrow indicates the low pressure side. When the air conditioner 100 executes the iron chloride recovery operation, first, the four-way valve 7 is connected to the discharge side of the compressor 1 and the outdoor heat exchanger 2, and the suction side of the compressor 1 and the gas side refrigerant pipe 6 are connected. Switch to communicate. Then, the decompression means 3 is fully closed, the first on-off valve 11a and the second on-off valve 11b are opened, and an iron chloride recovery circuit for allowing the new refrigerant to flow through the bypass pipe 13 is formed. Thereby, the new refrigerant discharged from the compressor 1 can be distributed to the iron chloride recovery means 10.

  The new refrigerant discharged from the compressor 1 includes the four-way valve 7, the outdoor heat exchanger 2, the first on-off valve 11a, the iron chloride recovery means 10, the second on-off valve 11b, the liquid side refrigerant pipe 5, the indoor heat exchanger 4, And it distribute | circulates sequentially through the gas side refrigerant | coolant piping 6, and returns to the suction side of the compressor 1 through the four-way valve 7. FIG. Here, it is desirable that the state of the new refrigerant flowing through the iron chloride recovery means 10 is a liquid state or a gas-liquid two-phase state controlled by a liquid phase. The reason is that the adsorption to activated carbon is more in the liquid phase than in the gas phase. In the air conditioner 100, the guarantee that the circulation of the new refrigerant to the iron chloride recovery means 10 is sufficiently performed and the amount of iron chloride in the refrigerant circuit does not cause sludge generation or failure of the compressor 1 is established. When the concentration drops to a certain level, the iron chloride recovery operation is stopped.

  In particular, since the first activated carbon 32 also adsorbs additives necessary for improving the performance of the new refrigeration oil, it should be noted that excessive iron chloride recovery operation is prohibited. Therefore, the influence of the decrease in additives can be reduced by adding more additives than necessary. Moreover, the 1st activated carbon 32 and the 2nd activated carbon 33 are previously immersed in new refrigerating machine oil, and the reduction | decrease of the additive which arises at the time of an iron chloride collection | recovery operation is prevented by using for the iron chloride collection | recovery means 10 in the state which adsorb | sucked the additive enough. be able to. This is because the pores having the pore diameters of the first activated carbon 32 and the second activated carbon 33 suitable for the adsorption of the additive are closed in advance, so that there is no room for adsorbing the additive when applied to an actual machine. Therefore, alteration of the new refrigeration machine oil due to adsorption of the additive to the first activated carbon 32 and the second activated carbon 33 can be prevented.

Finally, the first on-off valve 11a and the second on-off valve 11b are closed, and the pressure reducing means 3 is put into operation. By doing so, the new refrigerant discharged from the compressor 1 flows through the main pipe 9, does not flow into the bypass pipe 13, and does not flow through the iron chloride recovery means 10. That is, the decompression means 3 is opened, the first on-off valve 11a and the second on-off valve 11b are closed, and iron chloride is separated from the refrigerant circuit constituting the air conditioner 100. If the bypass circuit unit Z ₁ is detachable, the iron chloride adsorbed and recovered by the iron chloride recovery means 10 can be physically separated from the refrigerant circuit constituting the air conditioner 100.

Embodiment 2. FIG.
FIG. 6 is a schematic configuration diagram showing a circuit configuration of the air-conditioning apparatus 200 according to Embodiment 2 of the present invention. Based on FIG. 2, the circuit structure of the air conditioning apparatus 200 is demonstrated. This air conditioner 200 is installed in a building, a condominium, etc., like the air conditioner 100 according to Embodiment 1, and performs a cooling operation or a heating operation by using a refrigeration cycle that circulates the refrigerant. It is assumed that the old refrigerant is R22, the new refrigerant is tetrafluoropropene, the old refrigeration oil is mineral oil, and the new refrigeration oil is ester oil. Further, in the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and differences from the first embodiment will be mainly described.

In the air conditioner 100 according to the first embodiment, the case where the iron chloride recovery means 10 is used alone is shown as an example. However, in the air conditioner 200 according to the second embodiment, the iron chloride recovery means 10 is replaced with other iron chloride recovery means 10. The case where it uses together with a contaminant removal means is shown as an example. By doing in this way, the further iron chloride recovery effect can be exhibited. In the second embodiment, the case where the iron chloride recovery means 10 and the dryer 14 are used in combination will be described as an example. The dryer 14 is connected in a iron collecting means 10 and the series chloride (downstream side of the iron chloride recovery means 10) are mounted on the bypass circuit unit Z _2.

  Typically, zeolite is enclosed in the dryer 14, but silica gel, activated alumina, and a mixture thereof may be enclosed. This dryer 14 has two effects. The first effect is removal of moisture. As described above, the fluorocarbon refrigerant (tetrafluoropropene) having a double bond in the molecule generates an alcohol by reaction with water. The second activated carbon 33 is required to remove the iron chloride reacted with the alcohol. However, the amount of the second activated carbon 33 used can be reduced by removing the water. By providing the dryer 14 as shown in FIG. 6, the dryer 14 can be used even after the iron chloride recovery means 10 is disconnected. Further, it can be removed together with the iron chloride recovery means 10 without providing the first on-off valve 11a and the second on-off valve 11b.

  The second effect is the removal of alcohol. Moisture is present in the activated carbon. As shown in Embodiment 1, in use, the iron chloride recovery means 10 performs evacuation to remove moisture. However, activated carbon has a large surface area, and it takes a long time for vacuuming to completely remove the water adsorbed thereon, and the workability deteriorates. For this reason, the moisture remaining on the activated carbon surface reacts with the new refrigerant, and alcohol is generated on the activated carbon surface. For this reason, when alcohol is generated in the vicinity of the most downstream of the activated carbon, it is expected that the alcohol flows out to the existing piping without being adsorbed by the activated carbon and reacts with iron chloride in the existing piping.

  In this case, iron chloride that should originally be adsorbed by the first activated carbon 32 is adsorbed by the second activated carbon 33. Even if the amount of the second activated carbon 33 is determined in advance, this amount may be insufficient. Occurs. For this reason, like the air conditioner 200, the activated carbon surface is obtained by installing the dryer 14 on the downstream side of the activated carbon (iron chloride recovery means 10) in advance (between the iron chloride recovery means 10 and the second on-off valve 11b). It is possible to remove the alcohol generated in step (1), avoid load fluctuations on the second activated carbon 33 due to alcohol generation on the activated carbon surface which is difficult to predict, and minimize the amount of the second activated carbon 33. Accordingly, the dryer 14 removes moisture to prevent the new refrigerant from deteriorating and removes alcohol, which is a reaction product of the new refrigerant and water, thereby preventing sludge generation and corrosion of metal in the circuit.

  In the first embodiment and the second embodiment, the case where the bypass circuit unit Z1 and the bypass circuit unit Z2 are mounted in the outdoor unit X is described as an example. However, the present invention is not limited to this. Connection may be made as a unit different from X. In the second embodiment, the case where the iron chloride recovery means 10 and the dryer 14 are separately connected has been described as an example. However, the iron chloride recovery means 10 and the dryer 14 are integrated, for example, in the main body 30. The first activated carbon 32 and the second activated carbon 33 may be separated from the first activated carbon 32 and the second activated carbon 33 by separating them with a mesh stopper plate or the like.

It is a schematic block diagram which shows the circuit structure of the air conditioning apparatus which concerns on Embodiment 1. FIG. It is a longitudinal cross-sectional view which shows an example of schematic internal structure of an iron chloride collection | recovery means. It is a graph which shows the relationship between the pore diameter of activated carbon, and its cumulative distribution. It is a longitudinal cross-sectional view which shows another example of schematic internal structure of an iron chloride collection | recovery means. It is explanatory drawing for demonstrating the flow of the new refrigerant | coolant at the time of an iron chloride recovery driving | operation. 6 is a schematic configuration diagram showing a circuit configuration of an air-conditioning apparatus according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor, 2 Outdoor heat exchanger, 3 Pressure reduction means, 4 Indoor heat exchanger, 5 Liquid side refrigerant piping, 6 Gas side refrigerant piping, 7 Four-way valve, 9 Main piping, 10 Iron chloride collection | recovery means, 11a 1st opening / closing Valve, 11b second on-off valve, 13 bypass pipe, 14 dryer, 30 body, 31 mesh stopper plate, 32 first activated carbon, 33 second activated carbon, 34 activated carbon, 100 air conditioner, 200 air conditioner, X outdoor unit, Y Indoor unit, Z ₁ bypass circuit unit, Z ₂ bypass circuit unit.

Claims (7)

Fine pores that can adsorb substances with a molecular weight of 300 or more when the working refrigerant is changed from an old refrigerant containing chlorine to a hydrofluorocarbon refrigerant containing a double bond and the refrigerant pipe used in the old refrigerant is diverted The iron chloride recovery means formed on the surface is provided in a pipe through which the liquid refrigerant flows between the outdoor heat exchanger and the indoor heat exchanger,
An air conditioner characterized in that iron chloride that dissolves and flows in refrigerating machine oil corresponding to the hydrofluorocarbon refrigerant and a reaction product of the hydrofluorocarbon refrigerant are adsorbed and recovered by the iron chloride recovery means. The iron chloride recovery means includes
The air conditioner according to claim 1, wherein the air conditioner is detachably provided so as to be parallel to a part between the outdoor heat exchanger and the indoor heat exchanger. The iron chloride recovery means includes
A first recovery means having micropores on the surface capable of adsorbing a substance having a molecular weight of 300 or more;
The air-conditioning apparatus according to claim 1, further comprising: a second recovery unit having a micropore formed on a surface capable of adsorbing a substance having a molecular weight of 150 to 300. The first recovery means is a first activated carbon having a cumulative pore volume of 3% or more and 50% or more;
The air conditioner according to claim 3, wherein the second recovery means is a second activated carbon having a cumulative pore volume of 50% or more at 1 to 3 nm or less. The first activated carbon and the second activated carbon are:
The air conditioner according to claim 4, wherein the air conditioner is pre-immersed in refrigerating machine oil corresponding to a hydrofluorocarbon refrigerant containing a double bond. The air conditioner according to any one of claims 1 to 5, further comprising a dryer arranged in series with the iron chloride recovery means. The air-conditioning apparatus according to any one of claims 1 to 6, wherein the hydrofluorocarbon-based refrigerant containing a double bond is tetrafluoropropene.

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