WO2023053204A1 - 空気調和機 - Google Patents

空気調和機 Download PDF

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Publication number
WO2023053204A1
WO2023053204A1 PCT/JP2021/035638 JP2021035638W WO2023053204A1 WO 2023053204 A1 WO2023053204 A1 WO 2023053204A1 JP 2021035638 W JP2021035638 W JP 2021035638W WO 2023053204 A1 WO2023053204 A1 WO 2023053204A1
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WO
WIPO (PCT)
Prior art keywords
mass
machine oil
refrigerating machine
hydrogen iodide
air conditioner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/035638
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English (en)
French (fr)
Japanese (ja)
Inventor
修平 多田
宏治 内藤
亮 太田
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Hitachi Johnson Controls Air Conditioning Inc
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Hitachi Johnson Controls Air Conditioning Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Johnson Controls Air Conditioning Inc filed Critical Hitachi Johnson Controls Air Conditioning Inc
Priority to JP2021575000A priority Critical patent/JPWO2023053204A1/ja
Priority to PCT/JP2021/035638 priority patent/WO2023053204A1/ja
Publication of WO2023053204A1 publication Critical patent/WO2023053204A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/22—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehyde, ketonic, ether, ketal or acetal radical
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/16—Ethers
    • C10M129/18—Epoxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat

Definitions

  • the present invention relates to air conditioners.
  • Patent Document 1 uses a refrigerant containing trifluoroiodomethane, a refrigerating machine oil containing a stabilizer containing an epoxy compound and a monoterpene compound, an acid scavenger consisting of an aliphatic epoxy compound, and an extreme pressure agent.
  • a refrigeration cycle apparatus is disclosed.
  • Trifluoroiodomethane has poor thermochemical stability compared to even conventional refrigerants such as R32 refrigerant. Therefore, it is required more than before to deal with deteriorated substances generated by the deterioration of the refrigerant.
  • Trifluoroiodomethane generates R23 and hydrogen iodide by decomposition.
  • the generated hydrogen iodide poses a problem of lowering the reliability of the air conditioner. For example, hydrogen iodide reacts with copper in each connecting pipe in the refrigerating cycle, depositing copper iodide, and possibly clogging capillaries in the refrigerating cycle.
  • hydrogen iodide may act on refrigerating machine oil molecules to decompose refrigerating machine oil molecules to generate organic acids.
  • the generated organic acid and hydrogen iodide itself which is a strong acid, may corrode piping in the refrigeration cycle or cause stress corrosion cracking, resulting in refrigerant leakage.
  • additives such as stabilizers, acid scavengers, and extreme pressure agents are used for refrigerating machine oil
  • the viscosity of the refrigerating machine oil itself decreases due to the additives, and the inside of the compressor is damaged. There was a possibility that the lubricating function of the refrigerating machine oil would be degraded.
  • the present invention has been made in view of such problems, and aims to reduce the possibility of deterioration in the reliability of air conditioners while suppressing functional deterioration of refrigerating machine oil.
  • the present invention is an air conditioner, in which a refrigerant containing trifluoroiodomethane circulates, and hydrogen iodide generated due to deterioration of refrigerating machine oil and trifluoroiodomethane in the refrigerant can be captured by adsorption.
  • a refrigerating cycle in which a degraded substance capturing material capable of capturing hydrogen iodide having a mass of 0.0037 times or less the mass of the refrigerating machine oil is enclosed.
  • the present invention it is possible to reduce the possibility of deterioration in the reliability of the air conditioner while suppressing functional deterioration of the refrigerating machine oil.
  • FIG. 1 is a schematic diagram of a refrigerant circuit of an air conditioner according to Embodiment 1.
  • FIG. Fig. 3 is a cross-sectional view of an accumulator; It is a figure which shows the relationship between the mass of refrigerating machine oil, and the mass of the hydrogen iodide which arises in refrigerating machine oil. It is a figure which shows the adsorption amount of the hydrogen iodide for every material.
  • FIG. 4 is a diagram showing the relationship between the mass of refrigerating machine oil and the mass of a deteriorated substance capturing material;
  • FIG. 4 is a diagram showing the relationship between the mass of refrigerating machine oil and the mass of a deteriorated substance capturing material; is a diagram showing .
  • FIG. 1 is a schematic diagram of a refrigerant circuit of an air conditioner 1 according to this embodiment.
  • the air conditioner 1 includes an outdoor unit 10 and two indoor units 20a and 20b.
  • the outdoor unit 10 and the indoor units 20 a and 20 b are connected by a liquid pipe 31 and a gas pipe 32 .
  • a plurality of outdoor units may be connected to one indoor unit, or a plurality of indoor units may be connected to one outdoor unit.
  • Solid arrows shown in FIG. 1 indicate the flow of the refrigerant during the cooling operation.
  • the dashed arrows shown in FIG. 1 indicate the flow of the refrigerant during the heating operation.
  • the outdoor unit 10 includes a four-way valve 11, an accumulator 12, a compressor 13, an oil separator 14, an outdoor heat exchanger 15 and an outdoor expansion valve 16.
  • the indoor units 20a, 20b are provided with indoor heat exchangers 21a, 21b and indoor expansion valves 22a, 22b, respectively.
  • the four-way valve 11 is connected to the indoor units 20a and 20b, the accumulator 12, the oil separator 14, and the outdoor heat exchanger 15 via piping.
  • the four-way valve 11 and the indoor units 20 a and 20 b are connected via gas pipes 32 .
  • the four-way valve 11 and the accumulator 12 are connected via a pipe 34 .
  • the four-way valve 11, the oil separator 14, and the outdoor heat exchanger 15 are connected via piping.
  • the oil separator 14 is connected to a pipe 34 via an oil return pipe 33 . Also, the accumulator 12 and the compressor 13 are connected via a pipe 35 . Also, the compressor 13 and the oil separator 14 are connected via a pipe 36 .
  • the outdoor heat exchanger 15 is connected via piping to the outdoor expansion valve 16 connected to the liquid piping 31 .
  • the four-way valve 11 switches the refrigerant flow path according to the operation mode of the air conditioner 1 .
  • the compressor 13 the oil separator 14, the outdoor heat exchanger 15 (condenser), the outdoor expansion valve 16, the indoor expansion valves 22a and 22b, and the indoor heat A refrigeration cycle is formed in which the refrigerant circulates through the exchangers 21a and 21b (evaporators) and the accumulator 12 in this order.
  • the accumulator 12, the compressor 13, the oil separator 14, the indoor heat exchangers 21a, 21a (condensers), the indoor expansion valves 22a, 22b It becomes a refrigerating cycle in which the refrigerant circulates in the order of the outdoor expansion valve 16 and the outdoor heat exchanger 15 (evaporator).
  • the refrigerating cycle also contains refrigerating machine oil for lubricating the inside of the compressor 13 .
  • the refrigerating machine oil enclosed in the refrigerating cycle of the present embodiment is any one of polyvinyl ether oil, polyol ester oil, and polyalkylene glycol oil. Further, in the present embodiment, additives such as acid scavengers and stabilizers made of epoxy compounds are not added to the refrigerator oil.
  • the accumulator 12 is a container that adjusts the refrigerant discharged from the evaporator to a predetermined refrigerant dryness and discharges it to the compressor suction pipe (pipe 35). To ensure the reliability of a compressor by supplying refrigerant with a predetermined degree of dryness for compression even when excessive liquid refrigerant flows in during operation of an air conditioner, thereby avoiding liquid compression of the compressor.
  • the oil separator 14 separates the refrigerating machine oil discharged together with the gas refrigerant from the compressor 13 and the gas refrigerant.
  • a refrigerant containing trifluoroiodomethane (CF 3 I) is used as the refrigerant circulating in the refrigeration cycle.
  • trifluoroiodomethane Compared to conventional refrigerants, trifluoroiodomethane has lower stability of refrigerant molecules and tends to deteriorate in a high-temperature environment. Degradation of trifluoroiodomethane produces hydrogen iodide. Substances produced by degradation of trifluoroiodomethane are hereinafter referred to as degradation products. Some or all of hydrogen iodide, which is a degradation product, dissolves in the refrigerating machine oil.
  • FIG. 2 is a cross-sectional view of the accumulator 12.
  • An inflow pipe 41 and an outflow pipe 42 for the refrigerant are provided above the container 40 of the accumulator 12 .
  • the inflow pipe 41 is connected to the pipe 34 connected to the four-way valve 11 .
  • the outlet side of the outflow pipe 42 is connected to the pipe 35 on the suction side of the compressor 13 .
  • liquid refrigerant oil or a mixture of liquid refrigerant and refrigerant oil is stored in the lower part of the accumulator 12.
  • this stored refrigerating machine oil or mixture is referred to as refrigerating machine oil ⁇ .
  • refrigerating machine oil ⁇ the refrigerant coming out of the evaporator outlet through the inflow pipe 41 or the mixture of the refrigerant and the refrigerant flows into the accumulator 12 and is stored as the refrigerant oil ⁇ .
  • a portion of the refrigerant dissolves in the refrigerating machine oil ⁇ .
  • the solubility of the refrigerant in the refrigerating machine oil ⁇ varies depending on the refrigerant temperature and pressure.
  • the refrigerating machine oil ⁇ is sucked into the outflow pipe 42 through the opening 43a due to the pressure loss from the inlet of the outflow pipe 42 to the opening 43a, which is a hole for oil return provided in the outflow pipe 42. It is sent to the compressor 13 .
  • the outflow tube 42 is further provided with openings 43b and 43c for preventing overflow and adjusting dryness.
  • a filter-like partition plate 45 is provided on the lower side of the outflow pipe 42, and a degradation product capturing material 46 that captures hydrogen iodide, which is a degradation product, is accommodated under the partition plate 45.
  • the degraded substance capturing material 46 is an adsorbent that is solid at room temperature and captures hydrogen iodide by physically adsorbing it, and is molecular sieves in this embodiment.
  • the deteriorated substance trapping material 46 in the refrigerating cycle, has a predetermined amount of hydrogen iodide that can adsorb a predetermined mass of 0.0037 times or less the mass of the refrigerating machine oil enclosed in the refrigerating cycle. only enclosed.
  • the mass of the deteriorated substance trapping material 46 included in the refrigeration cycle of the present embodiment is greater than 0.25 times and 0.4 times or less the mass of the refrigerating machine oil. Further, in the present embodiment, the deteriorated substance trapping material 46 is granular with a diameter of about 0.5 mm to 3 mm. These numerical values will be described in detail later.
  • the number, hole diameter, and position of the openings of the accumulator 12 are not limited because they depend on the designed dryness. However, in order to exhibit the effect of the deteriorated substance trapping material 46 more effectively, the number, diameter, and position of the openings must be adjusted so that a certain amount of the refrigerating machine oil ⁇ is stored in the accumulator 12 in the steady operation state of the air conditioner. Also, the length and inner diameter of a capillary (not shown) installed on the oil return pipe 33 are desirably designed.
  • the amount of refrigerant circulation and the amount of refrigerating machine oil discharged from the compressor also fluctuate due to fluctuations in the compressor frequency.
  • the liquid level may rise up to the uppermost opening provided. Therefore, in order to effectively remove the hydrogen iodide produced by the deterioration of the refrigerant, it is desirable to provide the depleted hydrogen iodide capture material 46 at least below the uppermost opening. Furthermore, in order to remove hydrogen iodide from the mixture of refrigerating machine oil and refrigerant existing inside the accumulator even when the liquid level drops, the bottom of the accumulator, more preferably the lowest part for dryness adjustment of the outflow pipe, is used. It is desirable to provide the deteriorated substance trapping material 46 below the opening of the .
  • FIG. 3 shows the relationship between the amount of refrigerating machine oil enclosed in the refrigerating cycle and the mass of hydrogen iodide that can be generated in the refrigerating machine oil for each of a plurality of air conditioners.
  • the horizontal axis of graph 300 indicates the mass of refrigerating machine oil enclosed in the refrigerating cycle.
  • Mo indicates the mass of the refrigerating machine oil enclosed in the refrigerating cycle.
  • the vertical axis of the graph 300 indicates the mass of the maximum amount of hydrogen iodide that can be generated in the refrigerator oil.
  • the mass of hydrogen iodide that can be generated in the refrigerating machine oil enclosed in the refrigerating cycle is indicated by Mi.
  • Each plot in the graph 300 shows the relationship between the mass Mo of the refrigerating machine oil enclosed in the refrigerating cycle in a plurality of predetermined air conditioners and the mass Mi of hydrogen iodide that can be generated in the refrigerating machine oil. From the graph 300, it was found that in the air conditioner, hydrogen iodide with a maximum mass of 0.0037 times the mass Mo of the refrigerating machine oil can be generated in the refrigerating machine oil enclosed in the refrigerating cycle. That is, it was found that Mi ⁇ 0.0037 Mo, and hydrogen iodide having a mass of 0.0037 times or less the mass Mo of the refrigerating machine oil is produced in the air conditioner.
  • the refrigerating cycle of the air conditioner 1 is provided with a deteriorated substance capturing material in an amount capable of adsorbing hydrogen iodide having a mass not more than 0.0037 times the mass Mo of the refrigerating machine oil enclosed in the refrigerating cycle. 46 is enclosed.
  • Experiment 2 will be described. It can be used as a degraded substance capture material 46 that adsorbs hydrogen iodide generated as trifluoroiodomethane (CF 3 I) degrades from materials that have a track record of being installed as a dryer in the refrigeration cycle and materials that are expected to have an iodine removal effect.
  • materials A to D were prepared as materials. Material A is molecular sieves. Subsequently, trifluoroiodomethane and polyol ester (POE) oil VG68 were placed in a pressure vessel and heated in a coexistence environment for accelerated deterioration.
  • POE polyol ester
  • the refrigerating machine oil after accelerated deterioration was diluted with new oil containing no additives to adjust the total acid value to 0.5 mgKOH/g.
  • the refrigerating machine oil after adjustment and 1 g of each of the four materials A to D were allowed to stand in the refrigerating machine oil whose total acid value had been adjusted.
  • the refrigerant oil was analyzed after a certain period of time, and the adsorbed amounts of refrigerant deterioration products, ie, hydrogen iodide, to the materials A to D were measured.
  • Table 400 shows the correspondence between each of Materials AD and the mass of hydrogen iodide adsorbed on 1 g of each of Materials AD.
  • the material used as the deteriorated substance trapping material 46 be compatible with the refrigerant and refrigerating machine oil.
  • Compatibility tests with refrigerants and refrigerating machine oils were conducted for each of materials A to D.
  • materials B to D have a high possibility of opening the epoxy group of the acid scavenger having an epoxy group that can be added to the refrigerator oil and reducing the original effect.
  • the depleted substance trapping material 46 is composed of molecular sieves.
  • Mf represents the mass of the trapping material required to adsorb the maximum amount of hydrogen iodide generated in the refrigerating machine oil. More specifically, the maximum amount of hydrogen iodide that can be generated in the refrigerating machine oil was determined for each of a plurality of predetermined air conditioners having various rated capacities. Then, the following was performed for each of the plurality of predetermined air conditioners.
  • a graph 500 is a graph showing the relationship between the mass Mo of the refrigerating machine oil enclosed in the refrigerating cycle and the mass Mf of the capturing material required to adsorb the maximum amount of hydrogen iodide generated in the refrigerating machine oil.
  • the horizontal axis of the graph 500 indicates the mass Mo of the refrigerating machine oil enclosed in the refrigerating cycle.
  • the vertical axis of the graph 500 indicates the mass Mf of the trapping material required to adsorb the maximum amount of hydrogen iodide that can occur in the refrigerating machine oil enclosed in the refrigerating cycle.
  • Each plot of the graph 500 shows the mass Mo of the refrigerating machine oil enclosed in the refrigerating cycle when any of the materials A to D is applied as a hydrogen iodide trapping material to any of a plurality of predetermined air conditioners.
  • the relationship with the mass Mf of the capturing material required to capture the maximum amount of hydrogen iodide generated in the refrigerating machine oil is shown.
  • the mass of the deteriorated substance trapping material 46 is set to be greater than 0.25 times and less than or equal to 0.4 times the mass of the refrigerating machine oil enclosed in the refrigerating cycle.
  • the air conditioner 1 can capture hydrogen iodide without depending on the additive, and can reduce the possibility of deterioration in the reliability of the air conditioner 1 while suppressing the deterioration of the performance of the refrigerating machine oil due to the additive. .
  • the air conditioner 1 includes the deteriorated substance capturing material 46 in an amount capable of adsorbing hydrogen iodide having a mass of 0.0037 times or less the mass of the refrigerator oil.
  • any of the materials A to D with a mass of 0.25 to 0.4 times the mass of the refrigerating machine oil can appropriately adsorb hydrogen iodide generated in the refrigerating machine oil. is.
  • the air conditioner 1 of the present embodiment includes the deteriorated substance capturing material 46 having a mass equal to or less than 0.4 times and greater than 0.25 times the mass of the refrigerator oil. As a result, the air conditioner 1 does not have to include an excessive amount of the deteriorated substance capturing material 46 .
  • the space for storing solids in the refrigerating cycle is limited by setting the mass of the deteriorated substance capturing material 46 to an amount capable of adsorbing hydrogen iodide of a mass of 0.0037 times or less the mass of the refrigerating machine oil.
  • the degraded substance trapping material 46 can be arranged.
  • the depleted substance trapping material 46 is stored in the accumulator 12 .
  • the accumulator 12 stores a large amount of refrigerating machine oil in the refrigerating cycle.
  • hydrogen iodide can be captured more efficiently.
  • trifluoroiodomethane tends to deteriorate in a high-temperature environment, and hydrogen iodide is likely to be generated because compressed high-temperature, high-pressure refrigerant flows through the piping 36 on the discharge side of the compressor 13 and becomes hot. Hydrogen iodide produced in the pipe 36 flows into the accumulator 12 through the oil return pipe 33 . Therefore, by storing the depleted material capturing material 46 in the accumulator 12, the generated hydrogen iodide can be quickly captured.
  • a partition plate 45 is provided above the deteriorated substance trapping material 46 below the accumulator 12 .
  • the deteriorated substance trapping material 46 is granular with a diameter of about 0.5 mm to 3 mm. As a result, the surface area of the deteriorated substance trapping material 46 is increased, the number of times of contact with hydrogen iodide is increased, and the chances of trapping are increased. In addition, in this embodiment, since the upper portion of the depleted material capturing material 46 is closed by the partition plate 45, the depleted material capturing material 46 can be prevented from flowing out from the openings 43a to 43c. In addition, it is assumed that the particles of the deteriorated substance trapping material 46 rub against each other due to the flow of refrigerant and refrigerating machine oil inside the accumulator, generating abrasion powder.
  • partition plate 45 is configured in a mesh shape, it is possible to avoid flowing out of the accumulator. Therefore, it is possible to avoid the malfunction of the compressor and the expansion valve caused by the flow out of the accumulator and being caught in the bearing of the compressor, between the valve and the valve seat of the expansion valve, and by the poor sliding.
  • the air conditioner 1 of this embodiment differs from the air conditioner 1 of Embodiment 1 in the following two points.
  • the first point is that the refrigerating machine oil enclosed in the refrigerating cycle contains, as an additive, an acid scavenger that has an epoxy group and captures hydrogen iodide by chemically rendering it harmless. .01 wt % (mass %) or more and 5 wt % or less is added.
  • an acid scavenger that has an epoxy group and captures hydrogen iodide by chemically detoxifying it is simply referred to as an acid scavenger.
  • the second point is that the mass of the deteriorated substance trapping material 46 is 0.05 times or more and 0.25 times or less the mass of the refrigerating machine oil (mass without additives) Mo enclosed in the refrigeration cycle. This is the point.
  • the air conditioner 1 of the present embodiment uses both the degraded substance scavenger 46 and the acid scavenger added to the refrigerating machine oil to remove hydrogen iodide produced due to the degradation of trifluoroiodomethane contained in the refrigerant. to capture
  • an acid scavenger is added as an additive to the refrigerating machine oil enclosed in the refrigerating cycle at a rate of 0.01 wt % or more and 5 wt % or less.
  • the amount of the deteriorated substance scavenger 46 should be included to determine the amount of trifluoroiodomethane contained in the refrigerant. It was verified whether it is possible to prevent all the acid scavenger from being consumed only by hydrogen iodide generated with the deterioration of . As a result, it was found that it is desirable to include the deteriorated substance trapping material 46 in an amount of 0.05 times or more the mass Mo of the refrigerating machine oil sealed in the refrigerating cycle.
  • the mass of the deteriorated substance trapping material 46 is set to 0.05 Mo or more and 0.25 Mo or less. That is, the mass of the deteriorated substance capturing material 46 of the present embodiment falls within the range indicated by the dotted pattern in the graph 600 of FIG.
  • the air conditioner 1 of the present embodiment includes, in the refrigeration cycle, refrigerating machine oil to which an acid scavenger is added at a rate of 0.01 wt% or more and 5 wt% or less, 0.05 Mo or more, and A degraded substance capturing material 46 having a mass of 0.25 Mo or less is enclosed.
  • the acid scavenger can deal with organic acids other than hydrogen iodide that are generated due to the deterioration of trifluoroiodomethane contained in the refrigerant.
  • the mass of the depleted material capturing material 46 is greater than 0.25 times that of Mo and 0.4 times or less.
  • the mass of the depleted substance trapping material 46 may be greater than 0 and 0.25 times Mo or less. Even in this case, at least part of the hydrogen iodide generated as the trifluoroiodomethane contained in the refrigerant deteriorates can be captured.
  • additives such as acid scavengers and stabilizers are not added to the refrigerating machine oil in the refrigerating cycle.
  • additives may be added to the refrigerating machine oil in the refrigerating cycle within a range in which the viscosity does not drop below a predetermined level.
  • an acid scavenger is added as an additive to the refrigerating machine oil in the refrigerating cycle.
  • other additives such as stabilizers may also be added to the refrigerating machine oil in the refrigerating cycle within a range in which the viscosity does not drop below a predetermined level.
  • the deteriorated substance trapping material 46 having a mass of 0.25 times or less that of Mo is enclosed in the refrigeration cycle.
  • the deteriorated substance trapping material 46 having a mass larger than 0.25 times that of Mo may be enclosed in the refrigeration cycle.
  • the depleted material capturing material 46 is accommodated in the accumulator 12 .
  • the storage location of the deteriorated substance trapping material 46 may be a location different from the accumulator 12 in the refrigeration cycle. From the viewpoint of trapping efficiency, it is desirable to increase the number of contact times between the deteriorated substance trapping material 46 and the refrigerating machine oil. For this reason, instead of the accumulator 12 , the compressor 13 may be used as a reservoir for the refrigerating machine oil, and the deteriorated substance capturing material 46 may be accommodated in the compressor 13 .
  • a reservoir for refrigerating machine oil or a mixture of refrigerating machine oil and refrigerant is provided in the circuit in which the refrigerating machine oil circulates between the pipes 34, 35, and 36 and the oil return pipe 33, and the deteriorated substance capturing material 46 is provided in this reservoir.
  • the material used for the depleted substance trapping material 46 capable of effectively trapping hydrogen iodide generated by decomposition of trifluoroiodomethane may have a low heat resistance temperature. Therefore, when a material having a low heat resistance temperature is used as the depleted material trapping material 46, it is preferable to store it in a position where it does not reach a high temperature in the refrigeration cycle.
  • the depleted material capturing material 46 is granular. Therefore, the deteriorated substance trapping material 46 may have a shape different from the granular shape.
  • the depleted material capturing material 46 may be in the form of a block.
  • the depleted substance trapping material 46 may be applied to the inner walls of the accumulator 12, the pipes 34 and 35, and the like. As a result, the chances of contact between the hydrogen iodide and the depleted substance trapping material 46 can be increased more effectively, and the hydrogen iodide can be adsorbed more effectively.
  • the depleted substance trapping material 46 may be applied to the inner wall of the liquid pipe 31 .
  • the depleted substance capturing material 46 is molecular sieves.
  • the depleted substance trapping material 46 may be another material as long as it has properties similar to those of the materials AD.
  • the depleted substance trapping material 46 may be a material that is solid at room temperature and that adsorbs 0.006 g or more of hydrogen iodide per 1 g.
  • the depleted substance trapping material 46 may be any one of materials BD.
  • Air conditioner 10 Outdoor unit 11
  • Compressor 13 Compressor 14
  • Oil separator 15 Outdoor heat exchangers 20a, 20b Indoor unit 46

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Lubricants (AREA)
PCT/JP2021/035638 2021-09-28 2021-09-28 空気調和機 Ceased WO2023053204A1 (ja)

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WO2021044613A1 (ja) * 2019-09-06 2021-03-11 東芝キヤリア株式会社 冷凍サイクル装置
WO2021084569A1 (ja) * 2019-10-28 2021-05-06 日立ジョンソンコントロールズ空調株式会社 空気調和機

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WO2008006866A1 (en) * 2006-07-12 2008-01-17 Solvay Fluor Gmbh Method for heating and cooling using fluoroether compounds, compositions suitable therefore and their use

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WO2021044613A1 (ja) * 2019-09-06 2021-03-11 東芝キヤリア株式会社 冷凍サイクル装置
WO2021084569A1 (ja) * 2019-10-28 2021-05-06 日立ジョンソンコントロールズ空調株式会社 空気調和機

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