CN112410109A - Refrigerator oil, working fluid composition, and refrigeration cycle device - Google Patents
Refrigerator oil, working fluid composition, and refrigeration cycle device Download PDFInfo
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- CN112410109A CN112410109A CN202011363234.4A CN202011363234A CN112410109A CN 112410109 A CN112410109 A CN 112410109A CN 202011363234 A CN202011363234 A CN 202011363234A CN 112410109 A CN112410109 A CN 112410109A
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- 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
- C10M169/045—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds
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- 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
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
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- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
- C10M2207/042—Epoxides
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- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
- C10M2207/2835—Esters of polyhydroxy compounds used as base material
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- 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
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/02—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen and halogen only
- C10M2211/022—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen and halogen only aliphatic
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- 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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
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- 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
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/041—Triaryl phosphates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Oil, Petroleum & Natural Gas (AREA)
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Lubricants (AREA)
Abstract
The application relates to the technical field of refrigerator oil products and refrigeration devices, in particular to refrigerator oil, a working fluid composition and a refrigeration cycle device. The refrigerator oil is prepared by taking polyol ester synthesized by esterification of polyol and fatty acid as base oil, the viscosity of the refrigerator oil at 40 ℃ is 60-100 cst, and the density at 20 ℃ is more than 1g/cm3The refrigerating machine oil and the R32 refrigerant are separated into two layers in the working temperature range of the refrigerating system to form an oil-poor layer and an oil-rich layer. The working fluid composition formed by mixing the refrigerating machine oil and the R32 refrigerant can meet the requirements of long-term durability and ultralow temperature of the compressorThe starting performance and the oil return performance test requirements are met, the refrigerant oil can be widely applied to a refrigeration cycle device using R32 as a refrigerant, the oil return and lubrication problems of the refrigerant oil which is difficult to dissolve or is dissolved in the middle of the refrigerant used in the R32 refrigeration cycle device are solved under the condition that a compressor and the refrigeration cycle device are not modified, and the selection of the refrigerant oil of the R32 refrigeration cycle device is widened.
Description
Technical Field
The application relates to the technical field of refrigerator oil products and refrigeration devices, in particular to refrigerator oil, a working fluid composition containing the refrigerator oil and a refrigeration cycle device using the working fluid composition.
Background
Refrigerating machine oil is a functional fluid in a compressor, and plays an important role in a refrigeration cycle. The fast flowing refrigerant circulating system inevitably brings the refrigerating machine oil in the compressor into the refrigerating system, and the intermiscibility of the refrigerating machine oil and the refrigerant directly influences the working performance of the refrigerating system.
In the refrigeration equipment used in the room air-conditioning industry, the refrigerating machine oil used by the compressor is required to be completely dissolved with the refrigerant in a certain area above 0 ℃, so that the refrigerating oil discharged from the compressor can be dissolved in the refrigerant in the system and can return to the compressor along with the refrigerant, and the oil quantity in the compressor and the lubrication of parts are ensured. However, when the refrigerating machine oil having a good compatibility is combined with the refrigerant, the refrigerant is diluted more in viscosity of the refrigerating machine oil, so that the viscosity is greatly reduced, and the lubricating property is reduced by the reduction of viscosity, thereby causing wear of sliding parts. In addition, because the refrigerating machine oil and the refrigerant have good compatibility, the refrigerating machine oil and the refrigerant are mixed together and discharged out of the compressor, so that the oil quantity in the compressor is reduced, the lubricating property of parts of the compressor is influenced by serious people, the refrigerating machine oil discharged by the compressor is attached to the pipe wall of the refrigerating system, the heat exchange efficiency is influenced, and the energy efficiency of the refrigerant system is reduced.
In the prior art, refrigerating machine oil which is insoluble (difficult to dissolve or weak to dissolve) with a refrigerant is rarely used, and the problem that the refrigerating machine oil which is not sucked from the bottom of a compressor and is discharged from the compressor is difficult to return to the inside of the compressor when the compressor is started in a low-temperature environment exists, although the oil viscosity can be ensured because the dilution degree of the oil is low due to the small dissolving amount of the refrigerant. Although patent CN102679604B discloses a refrigeration device using a hydrocarbon refrigerant, which uses polyalkylene glycol oil separated into two layers from the refrigerant, the density of the hydrocarbon refrigerant is low, and even if the refrigerant and the oil are separated into two layers, the refrigerator oil will sink below the liquid refrigerant, so that the problem that the oil cannot be sucked from the bottom of the compressor can be solved. For the problem of oil return, although it is mentioned that the refrigerating machine oil dissolved in the refrigerant can be ensured to circulate in the refrigerating circuit by dissolving more than 2% of the refrigerating machine oil in the liquid refrigerant, when the mixture of the refrigerant and the refrigerating machine oil circulates to the evaporator, the refrigerant is gasified, the content of the refrigerating machine oil is gradually increased, the mixture is layered, for an oil-poor layer (more than 2% of the refrigerating machine oil dissolved in the refrigerant), the oil return is not problematic, for an oil-rich layer (high content of the refrigerating machine oil), the proportion of the refrigerating machine oil is not specified, even if the viscosity grade of the refrigerating machine oil is as low as ISO VG 32-68 (40 ℃ viscosity), the evaporator is generally in a low-temperature environment, when the temperature is 0 ℃ or lower, the viscosity of the refrigerating machine oil is increased, and at the moment, the amount of the refrigerant dissolved in the refrigerating machine oil is small.
For HFC refrigerants having a density at low temperatures greater than that of refrigerating machine oil, the use of immiscible oils requires solving the problems of the refrigerant separating from the refrigerating machine oil into two layers, the refrigerant sinking into the lower oil layer and being sucked by the compressor, and the refrigerant returning from the evaporator to the compressor, and requires modification of the compressor refrigeration circuit or refrigeration system, resulting in an increase in cost, and therefore HFC refrigeration devices use little immiscible oils.
Among HFC refrigerants, HFC-134a, R407C, and R410A have high Global Warming Potential (GWP) and are subject to restriction, although the Ozone Depletion Potential (ODP) is 0. R32 (difluoromethane) refrigerant has attracted attention as one of chlorine-free HFCs and candidate refrigerants with low GWP because of its characteristics such as environmental friendliness, high energy efficiency, and easy handling. However, the refrigerating machine oil widely used in the HFC refrigerant at present is difficult to be compatible with the R32 refrigerant. When a refrigeration cycle apparatus using R32 refrigerant uses a refrigerator oil that is incompatible or intermediate-compatible with R32 refrigerant, the above-described problems of oil return and lubrication are also present.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a refrigeration cycle apparatus using R32 refrigerant uses a refrigerator oil that is difficult or intermediate to dissolve in the refrigerant, so that the oil return performance of the refrigerator oil in the refrigeration cycle system is poor, and poor lubrication is caused by a decrease in the amount of the refrigerator oil inside the compressor. In order to solve the above technical problems, the present application provides a refrigerator oil, a working fluid composition, and a refrigeration cycle device.
In order to achieve the above object, according to a first aspect of an embodiment of the present application, there is provided a refrigerator oil.
The refrigerator oil according to the embodiment of the application takes polyol ester synthesized by esterification of polyol and fatty acid as base oil, and the refrigerator oil and R32 refrigerant are subjected to two-layer separation in the working temperature range of a refrigerating system to form an oil-poor layer and an oil-rich layer; and under the state that the refrigerating system is at the lowest evaporation temperature, the viscosity of the oil-rich layer is not higher than 30cst, and the viscosity of the oil-poor layer is not lower than 0.5 cst.
Further, the refrigerator oil has a viscosity of 60-100 cst at 40 ℃ and a density of more than 1g/cm at 20 ℃3。
Further, in the lean oil layer: the saturated solubility of the refrigerator oil in the R32 refrigerant is not higher than 25%, and the saturated solubility of the refrigerator oil in the R32 refrigerant is not lower than 10% in a state where the refrigeration system is at the lowest evaporation temperature;
in the oil-rich layer: the saturated solubility of the R32 refrigerant in the refrigerator oil is not higher than 60%, and the saturated solubility of the R32 refrigerant in the refrigerator oil is not lower than 30% in a state where the refrigeration system is at the lowest evaporation temperature.
Further, the working temperature range of the refrigerating system is-30 ℃ to 70 ℃.
Further, in the refrigerator oil, the polyol is at least one of neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol; the fatty acid is C4～C10A mono-fatty acid and/or a di-fatty acid.
Further, in the refrigerator oil, the fatty acid is at least one of butyric acid, isobutyric acid, valeric acid, 2-methylbutyric acid, caproic acid, 2-methylpentanoic acid, 2-ethylhexanoic acid, 3,5, 5-trimethylhexanoic acid, adipic acid, azelaic acid, and sebacic acid.
Further, the refrigerator oil also comprises an additive, wherein the additive comprises at least one of an antiwear agent, an antioxidant, a passivator and an acid catcher.
In order to achieve the above object, according to a second aspect of embodiments of the present application, the present invention also provides a working fluid composition.
A working fluid composition according to an embodiment of the present application comprising a refrigerator oil as provided in the first aspect of the embodiments of the present application and R32 refrigerant.
In order to achieve the above object, according to a third aspect of an embodiment of the present application, there is also provided a refrigeration cycle apparatus.
A refrigeration cycle device according to an embodiment of the present application, includes:
a refrigeration circuit; and
and a working medium enclosed in the refrigeration circuit and circulating in the refrigeration circuit while repeating compression, condensation, throttling, and evaporation, the working medium being a working fluid composition provided in a second aspect of embodiments of the present application.
Further, in the refrigeration cycle device, the refrigeration circuit comprises a compressor, a condenser, a throttling element and an evaporator which are connected through pipelines, and the compressor is a double-stage enthalpy-increasing rotary compressor.
The refrigerating machine oil provided by the invention can meet the requirements of long-term durability, ultralow-temperature startability and oil return performance tests of a compressor by mixing the working fluid composition with the R32 refrigerant, can be widely applied to a refrigeration cycle device taking R32 as the refrigerant, solves the problems of oil return and lubrication of the refrigerating machine oil which is difficult to dissolve in the refrigerant or is dissolved in the middle in the R32 refrigeration cycle device under the condition of not modifying the compressor and the refrigeration cycle device, and widens the refrigerating machine oil selection of the R32 refrigeration cycle device.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is a schematic system configuration diagram of a refrigeration cycle apparatus according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a two-stage enthalpy-increasing rotary compressor according to an embodiment of the present application;
FIG. 3 is a graph showing the density of a refrigerating machine oil and an R32 refrigerant obtained in examples 1-2 and comparative examples 1-2 of the present invention as a function of temperature; and
fig. 4 is a graph showing two-layer separation temperature curves of working fluid compositions of the refrigerator oil obtained in examples 1-2 and comparative examples 1-2 according to the present invention and R32 refrigerant, respectively, wherein a legend with arrows indicates that the temperature of the refrigerant-refrigerant separation layer is higher or lower than the oil content.
In the figure:
1. a compressor; 2. a four-way change-over valve; 3. an outdoor heat exchanger; 4. an electric expansion valve; 5. an indoor heat exchanger; 6. a reservoir; 7. a control device; 8-9, connecting a pipeline; 10. an outdoor assembly; 11-16, a temperature sensor; 17. a closing valve; 18. a closing valve; 19. an indoor assembly; 101. an upper cover assembly; 102. a housing assembly; 103. a motor rotor; 104. a motor stator; 105. a crankshaft; 106. an upper flange; 107. an upper roller; 108. an upper cylinder; 109. a middle partition plate; 110. an enthalpy increasing component; 111. a lower cylinder; 112. a lower roller; 113. a lower flange; 114. a lower cover; 115. mounting a plate; 116. a dispenser component.
Detailed Description
In order to make the technical solution of the present invention more clear, the refrigerating machine oil, the working fluid composition and the refrigeration cycle device using the same of the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic system configuration diagram of a refrigeration cycle apparatus according to the present invention, the refrigeration cycle apparatus includes a refrigeration circuit, the refrigeration circuit includes a compressor, a condenser, a throttling element, and an evaporator connected by a pipeline, specifically, in fig. 1, the condenser and the evaporator are an outdoor heat exchanger 3 and an indoor heat exchanger 5, and the throttling element is an electric expansion valve 4. As can be seen in FIG. 1, the refrigeration cycle device comprises a compressor 1, a four-way change-over valve 2, an outdoor heat exchanger 3, an electric expansion valve 4, an indoor heat exchanger 5, a liquid storage 6, a control device 7, temperature sensors 11-16, closing valves 17-18 and connecting pipelines 8-9; the outdoor unit 10 is composed of a compressor 1, a four-way change-over valve 2, an outdoor heat exchanger 5, an electric expansion valve 4, a liquid storage 6, a control device 7, a closing valve 17, a closing valve 18, temperature sensors 11-13 and a temperature sensor 16, the indoor unit 19 is composed of an indoor heat exchanger 5, temperature sensors 14 and a temperature sensor 15, and the indoor unit 10 and the outdoor unit 19 are connected through a connecting pipeline 8 and a connecting pipeline 9.
Specifically, in the refrigeration cycle apparatus, one end of the four-way switching valve 2 is connected to the discharge side of the compressor 1; one end of the outdoor heat exchanger 3 is connected to the other end of the four-way switching valve 2; one end of the electric expansion valve 4 is connected to the other end of the outdoor heat exchanger 3; one end of the indoor heat exchanger 5 is connected to the other end of the electric expansion valve 4; one end of the accumulator 6 is connected to the other end of the indoor heat exchanger 5 via the four-way switching valve 2, and the other end is connected to the suction side of the compressor 1. The refrigeration cycle device is provided with: a temperature sensor 11 for detecting the temperature of the discharge pipe of the compressor 1; a temperature sensor 12 for detecting the refrigerant temperature of the outdoor heat exchanger 3; a sensor 13 for detecting an outside air temperature; a temperature sensor 14 for detecting the refrigerant temperature of the indoor heat exchanger 5; a temperature sensor 15 for detecting an indoor temperature; a temperature sensor 16 for detecting the suction side refrigerant temperature of the compressor 1; the control device 7 is configured to receive signals output from the temperature sensors 11 to 16 and control operations of the compressor 1, the motor-driven expansion valve 4, and the like. A closing valve 17 is disposed between the electric expansion valve 4 and the indoor heat exchanger 5, and a closing valve 18 is disposed between the indoor heat exchanger 5 and the four-way switching valve 2.
In the above refrigeration cycle device, the compressor is preferably a two-stage enthalpy-increasing rotary compressor, and the specific structure thereof refers to the structural schematic diagram of the two-stage enthalpy-increasing rotary compressor shown in fig. 2. The main structure of the double-stage enthalpy-increasing rotary compressor comprises an upper cover assembly 101, a shell assembly 102, a motor rotor 103, a motor stator 104, a crankshaft 105, an upper flange 106, an upper roller 107, an upper cylinder 108, a middle partition plate 109, an enthalpy-increasing component 110, a lower cylinder 111, a lower roller 112, a lower flange 113, a lower cover 114, a mounting plate 115 and a liquid distributor component 116. The shell is internally provided with a motor, a low-pressure stage compression part and a high-pressure stage compression part which are driven by the motor are arranged, an intermediate channel is arranged between the high-pressure stage compression part and the low-pressure stage compression part, and an enthalpy increasing loop is arranged on the intermediate channel. The specific structure and the operation principle of the two-stage enthalpy-increasing rotary compressor are applicable to the prior art, and reference may be made to patent publications of the applicant before the filing date of this patent application, such as patent publications with publication numbers CN104632626B, CN105508246B, and CN104110377B, for example, so that the present invention is not described in detail.
In recent years, with the development of heat pump water heaters, the service temperature range of a compressor is required to be wider, the lowest evaporation temperature is about-30 to-10 ℃, and the highest condensation temperature is about 60 to 70 ℃. Along with the reduction of the environmental temperature, the suction pressure of the circulating working medium is reduced, the suction specific volume is increased, the pressure ratio of the compressor is increased, the exhaust temperature is rapidly increased, the system heating capacity and the energy efficiency are rapidly reduced, the long-term operation reliability of the compressor is poor, the compression ratio of the compressor adopting the double-stage compression cycle is smaller than that of the compressor adopting the conventional single-stage cycle, the exhaust temperature is low, and the double-stage enthalpy-increasing rotary compressor can be suitable for the field of low-temperature heating, and the lowest working temperature of the double-.
The refrigerating machine oil and the working fluid composition provided by the present invention are described by taking the use in the above-mentioned two-stage enthalpy-increasing rotary compressor and refrigeration cycle device as an example. When the working fluid composition as a working medium is used for refrigerating operation in the refrigeration cycle apparatus having the above-described structure, the four-way switching valve 2 is switched to the switching position indicated by the solid line in fig. 1 (switching to the dotted line position during heating operation), the two-stage enthalpy-increasing rotary compressor is started, and when the compressor 1 is operated, the low-pressure refrigerant enters the low-pressure stage compression portion through the accumulator, is discharged to the intermediate passage through the low-pressure stage discharge port after the low-pressure stage compression portion completes the first-stage compression, and the intermediate-pressure refrigerant entering from the enthalpy-increasing circuit is mixed with the first-stage discharge gas in the intermediate passage, and the mixed gas enters the high-pressure stage compression portion, and after the second-stage compression is completed, the discharged high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 3 with a part of the refrigerating machine oil through the four-way switching valve 2, and the high-temperature, next, the low-temperature high-pressure refrigerant condensed by the outdoor heat exchanger 3 is decompressed by the electric expansion valve 4 to become a low-temperature low-pressure liquid, and enters the indoor heat exchanger 5 through the connection line, and the low-temperature low-pressure refrigerant is evaporated by heat exchange with a medium such as air in the indoor heat exchanger 5, and the evaporated refrigerant is returned to the suction side of the two-stage enthalpy-increasing rotary compressor through the connection line, the four-way switching valve 2, and the accumulator 6. In this way, the working fluid composition containing the refrigerant is circulated in the refrigerant circuit constituted by the two-stage enthalpy-increasing rotary compressor, the outdoor heat exchanger 3, the motor-operated expansion valve 4, the indoor heat exchanger 5, and the accumulator 6.
The refrigerator oil provided by the embodiment of the invention takes polyol ester as base oil, and the polyol ester is synthesized by esterification of polyol and fatty acid.
Among them, the polyol used for synthesizing the polyol ester includes, but is not limited to, one or more of neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol, and dipentaerythritol and/or pentaerythritol is preferably used.
Among them, for synthesizing polyol estersThe fatty acid is preferably C4-C10The fatty acid of (2) may be linear or branched, and may be a monovalent fatty acid or a divalent fatty acid, and specific examples thereof include butyric acid, isobutyric acid, valeric acid, 2-methylbutyric acid, caproic acid, 2-methylpentanoic acid, 2-ethylhexanoic acid, 3,5, 5-trimethylhexanoic acid, adipic acid, azelaic acid, sebacic acid, and the like.
It should be noted that the polyol ester in the present invention may be a full ester in which all of the hydroxyl groups of the polyol are esterified, a partial ester in which a part of the hydroxyl groups of the polyol are not esterified but remain, or a mixture of the full ester and the partial ester, and the full ester is preferred in the embodiment of the present invention.
In addition to the base oil, the refrigerator oil of the present invention may further contain conventional additives for refrigerator oil, such as hindered phenol/alkyldiphenylamine synergistic antioxidants, benzotriazole metal deactivators, thiophosphate anti-wear agents, and alkyl glycidyl ether acid scavengers, as required, in order to further improve the performance, wherein the total amount of the additives is not more than 3% by mass of the total amount of the refrigerator oil.
In order to make the technical solutions in the embodiments of the present application better understood, the technical solutions in the embodiments of the present application are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
According to the stoichiometric proportion required by full ester generation through esterification reaction, under the condition of slight excess of acid, taking a proper amount of dipentaerythritol, butyric acid and 2-ethylhexanoic acid, and obtaining the target base oil after heating, water separation, reflux and reduced pressure distillation, wherein the molar ratio of butyric acid to 2-ethylhexanoic acid is 1.1: 1. the mass percentage of the base oil in the refrigerator oil is 97.5%, the rest 2.5% is additive, specifically 0.5% antioxidant, and 2, 6-di-tert-butyl-4-cresol is selected; 0.02% of a metal deactivator selected as a benzotriazole derivative (T551); 1% of antiwear agent, selected from tricresyl phosphate; 0.98% of acid trapping agent, 2-ethylhexyl glycidyl ether was selected, and the above percentages are mass ratios.
Example 2
According to the stoichiometric proportion required by the full ester generated by the esterification reaction, under the condition of slight excess of acid, a proper amount of pentaerythritol, isobutyric acid, adipic acid and 3,5, 5-trimethylhexanoic acid are taken, and the target base oil is obtained after heating, water separation, reflux and reduced pressure distillation, wherein the molar ratio of the isobutyric acid to the adipic acid to the 3,5, 5-trimethylhexanoic acid is 20:15: 65. The total amount of the base oil in the refrigerator oil accounts for 97.5%, the rest 2.5% is additive, specifically 0.5% antioxidant, and 2, 6-di-tert-butyl-4-cresol is selected; 0.02% of a metal deactivator selected as a benzotriazole derivative (T551); 1% of antiwear agent, selected from tricresyl phosphate; 0.98% of an acid scavenger selected as pentaerythritol tetraglycidyl ether. The above percentages are mass ratios.
Comparative example 1
According to the stoichiometric proportion required by full ester generation through esterification reaction, under the condition of slight excess of acid, taking a proper amount of dipentaerythritol, butyric acid and 2-ethylhexanoic acid, and obtaining the target base oil after heating, water separation, reflux and reduced pressure distillation, wherein the molar ratio of butyric acid to 2-ethylhexanoic acid is 1: 1.3. the total amount of the base oil in the refrigerator oil accounts for 97.5%, the rest 2.5% is additive, specifically 0.5% antioxidant, and 2, 6-di-tert-butyl-4-cresol is selected; 0.02% of a metal deactivator selected as a benzotriazole derivative (T551); 1% of antiwear agent, selected from tricresyl phosphate; 0.98% of an acid scavenger, 2-ethylhexyl glycidyl ether was chosen. The above percentages are mass ratios.
Comparative example 2
According to the stoichiometric proportion required by the full ester generated by the esterification reaction, under the condition of slight excess of acid, a proper amount of pentaerythritol, isobutyric acid, adipic acid and 3,5, 5-trimethylhexanoic acid are taken, and the target base oil is obtained after heating, water separation, reflux and reduced pressure distillation, wherein the molar ratio of the isobutyric acid to the adipic acid to the 3,5, 5-trimethylhexanoic acid is 60:10: 30. The total amount of the base oil in the refrigerator oil accounts for 97.5%, the rest 2.5% is additive, specifically 0.5% antioxidant, and 2, 6-di-tert-butyl-4-cresol is selected; 0.02% of a metal deactivator selected as a benzotriazole derivative (T551); 1% of antiwear agent, selected from tricresyl phosphate; 0.98% of an acid scavenger selected as pentaerythritol tetraglycidyl ether. The above percentages are mass ratios.
Table 1 shows the physicochemical properties of the refrigeration oil obtained in examples 1-2 and comparative examples 1-2, wherein the kinematic viscosity, density and pour point index were measured by a conventional detection method for refrigeration oil, the separation ratio of refrigeration oil and refrigerant was determined by referring to SH/T0699-2000 "test method for compatibility of refrigeration oil and refrigerant", and two-phase separation temperatures of refrigeration oil and R32 refrigerant were measured at different oil contents, and a two-layer separation temperature curve was drawn to determine that when refrigeration oil and refrigerant were separated into two phases, the layer with less refrigeration oil content was an oil-poor layer, and the layer with more refrigeration oil content was an oil-rich layer. The viscosity of the refrigerating machine oil and refrigerant composition is measured by filling the refrigerating machine oil and the refrigerant with a proper proportion by using an independently-built online viscometer pressure-resistant device and adjusting the pressure and the temperature.
FIG. 3 is a graph showing the change in density with temperature of the refrigerator oil and the R32 refrigerant obtained in examples 1-2 and comparative examples 1-2 of the present invention. The density of the R32 refrigerant is higher than that of the refrigerator oil under low temperature conditions, and the densities of the refrigerator oil and the refrigerant are reversed as the temperature increases, so that when the refrigerator oil and the R32 refrigerant composition are separated into two layers, a lean oil layer is in the lower layer and a rich oil layer is in the upper layer under low temperature conditions, and a rich oil layer is in the lower layer and a lean oil layer is in the upper layer under high temperature conditions. Specifically, when the temperature was lower than 10 ℃ and the two-layer separation of the refrigerator oil obtained in examples 1-2 and comparative example 1 and the R32 refrigerant composition occurred, the lean oil layer was in the lower layer, and when the temperature was higher than 10 ℃, the rich oil layer was in the lower layer. For comparative example 2, when the temperature was lower than 0 ℃, the oil-poor layer was in the lower layer when the two-layer separation of the refrigerator oil from the R32 refrigerant composition occurred, and when the temperature was higher than 0 ℃, the oil-rich layer was in the lower layer.
TABLE 1 refrigerator oil physico-chemical properties
Fig. 4 is a graph showing two-layer separation temperature curves of working fluid compositions of the refrigerating machine oil obtained in examples 1-2 and comparative examples 1-2 according to the present invention, respectively, and R32 refrigerant, in the range of the operating temperature of the refrigerating system, and the refrigerating machine oil of the examples and comparative examples has a completely immiscible region with R32 refrigerant, which is specifically analyzed as follows.
Refrigerator oil prepared in example 1: when the ratio of the refrigerating machine oil prepared in example 1 in the mixed liquid of the refrigerating machine oil and the refrigerant is within 20-45%, the refrigerating machine oil is not dissolved in the R32 refrigerant in the whole temperature range, and two-layer separation occurs. In the lean layer region, the saturated solubility of the refrigerating machine oil in the refrigerant of example 1 was 18% (it should be noted that the solubility in the present invention means the mass content of the refrigerant dissolved in the liquid refrigerant or the refrigerating machine oil in the total mass of the refrigerating machine oil and the refrigerant mixture at a certain temperature), and in the oil-rich layer region, the saturated solubility of the refrigerant in the refrigerating machine oil was 52%. In the lean layer in which the refrigerator oil of example 1 was separated into two layers from the R32 refrigerant at-30 ℃, the solubility of the refrigerator oil in R32 was 10%, and in the rich layer, the solubility of the R32 refrigerant in the refrigerator oil was 42%.
Refrigerator oil prepared in example 2: when the ratio of the refrigerating machine oil prepared in the embodiment 2 in the mixed liquid of the refrigerating machine oil and the R32 refrigerant is within 20-45%, the refrigerating machine oil is not dissolved in the R32 refrigerant in the whole temperature range, and two-layer separation occurs. In the lean region, the saturated solubility of the refrigerator oil of example 2 in the refrigerant was 19%, and in the rich region, the saturated solubility of the refrigerant in the refrigerator oil was 55%. The solubility of the refrigerator oil of example 2 in R32 was 12% in the oil-poor layer in which the refrigerator oil of example 2 and the R32 refrigerant were separated into two layers at-30 ℃, and the solubility of the R32 refrigerant in the oil-rich layer was 38%.
Refrigerator oil prepared in comparative example 1: when the ratio of the refrigerating machine oil of comparative example 1 is within 10 to 50% of the mixed liquid of the refrigerating machine oil and the refrigerant, the refrigerant is not miscible with the R32 refrigerant in the entire temperature range, and two-layer separation occurs. In the lean layer region, the refrigerator oil of comparative example 1 had a saturated solubility in the refrigerant of 10%, and in the oil-rich layer region, the refrigerator oil had a saturated solubility in the refrigerant of 47%. In the lean layer in which the refrigerator oil of comparative example 1 and the R32 refrigerant were separated into two layers at-30 ℃, the solubility of the refrigerator oil of comparative example 1 in R32 was 5%, and in the rich layer, the solubility of the R32 refrigerant in the refrigerator oil was 25%.
Refrigerator oil prepared in comparative example 2: when the ratio of the refrigerating machine oil of comparative example 2 is within 30 to 40% of the mixed liquid of the refrigerating machine oil and the refrigerant, the refrigerant is not miscible with the R32 refrigerant in the entire temperature range, and two-layer separation occurs. In the lean layer region, the saturated solubility of the refrigerator oil of comparative example 2 in the refrigerant was 28%, and in the rich layer region, the saturated solubility of the refrigerant in the refrigerator oil was 58%. In the lean layer in which the refrigerator oil of comparative example 2 and the R32 refrigerant were separated into two layers at-30 ℃, the solubility of the refrigerator oil of comparative example 2 in R32 was 22%, and in the rich layer, the solubility of the R32 refrigerant in the refrigerator oil was 54%.
The refrigerator oils obtained in examples 1 to 2 and comparative examples 1 to 2 were subjected to a compressor durability test, a low-temperature start test, and an air conditioning system oil return test, and the results are shown in table 2.
TABLE 2 Endurance test, low temperature start test and oil return test results of air conditioning system for refrigerator oil compressor
The endurance test working condition of the compressor is shown in a table 3, the low-temperature starting test working condition is shown in a table 4, and the oil return time of the air conditioner system is shown in a table 5.
TABLE 3 endurance test conditions for compressor
TABLE 4 Low temperature Start-Up test conditions
TABLE 5 oil Return Experimental conditions of air conditioning system
The working fluid composition of the present invention, which consists of R32 refrigerant and the refrigerating machine oil in each of the examples and comparative examples, has a completely immiscible region in the operating temperature range of the refrigerating system (lowest evaporation temperature-30 ℃ to highest condensation temperature-70 ℃), in which the refrigerating machine oil and the R32 refrigerant are separated into two layers in the entire temperature range, in which the refrigerating machine oil and the refrigerant are in equilibrium with each other, and at low temperatures, since the density of the R32 refrigerant is higher than that of the refrigerating machine oil, when the refrigerating machine oil and the R32 refrigerant are separated into two layers, the lower layer is a saturated solution of the refrigerating machine oil in the refrigerant (referred to as an oil-poor layer), the upper layer is a saturated solution of the refrigerant in the refrigerating machine oil (referred to as an oil-rich layer), and at high temperatures, the oil-rich layer is the lower layer, and.
Under the normal operation condition of the compressor, when the solubility of the refrigerating machine oil in the refrigerant is increased, the content of the refrigerating machine oil discharged out of the compressor along with the refrigerant is increased, and the tightness and the energy efficiency of the compressor are easily reduced, so the solubility of the refrigerating machine oil in the refrigerant cannot be too high, and when the solubility of the refrigerating machine oil in the refrigerant is less than 25%, the discharge amount of the refrigerating machine oil can be controlled below 5%, and the internal oil amount of the compressor is ensured. When the compressor is started and operated in a low-temperature environment, the density of the refrigerant is higher than that of the refrigerating machine oil, the lower layer is an oil-poor layer, a mixed liquid layer rich in the refrigerant is firstly sucked by the compressor, the viscosity of the mixed liquid is reduced along with the low solubility of the refrigerating machine oil in the refrigerant, the sucked mixed liquid cannot form a proper oil film at a friction motion part in the compressor, and the abrasion of parts of the compressor is possibly caused. When the temperature is-30 ℃, the solubility of the refrigerating machine oil of the embodiments 1-2 and the comparative example 2 in the refrigerant is more than 10%, the viscosity of the working fluid composition mixed with the R32 refrigerant is about 1cst, and the lubricating property of the compressor at low-temperature starting can be ensured. Along with the start of the compressor, the temperature in the compressor rises, the liquid refrigerant begins to evaporate, the oil content of the refrigerator gradually increases, the viscosity of the mixed working medium further increases, and the long-term lubrication of the compressor can be ensured. When the refrigerating machine oil in the comparative example 1 is divided into two layers with the R32 refrigerant at-30 ℃, the lean oil layer is arranged at the lower layer, the content of the refrigerating machine oil in the lean oil layer is 5%, the viscosity of the mixed working medium of the refrigerating machine oil and the refrigerant is low (0.24cst), and the mixed liquid initially sucked by the compressor at low-temperature start cannot form an oil film on the surface of a part, so that the part is abraded after the compressor is tested at low-temperature start.
After the compressor normally operates, the temperature in the compressor rises, an oil-rich layer of the mixed working medium of the refrigerating machine oil and the refrigerant is positioned at the bottom of the compressor, the compressor sucks mixed liquid rich in the refrigerating machine oil, at the moment, the dissolving amount of the refrigerant in the oil-rich layer cannot be too large, otherwise, the refrigerating machine oil can be diluted, the viscosity of the refrigerating machine oil can be reduced due to the rise of the temperature, and in addition, the dilution of the refrigerant can lead to the lower viscosity of the mixed working medium, so that an oil film cannot be formed at a friction movement part in the compressor possibly, and the abrasion of parts of the compressor. In examples 1-2 of the present invention, the working fluid composition formed by mixing the refrigerating machine oil in comparative example 1 with the R32 refrigerant respectively has a viscosity of about 2cst at 110 ℃ and 4.2MPa, and parts are slightly worn after a 1000-hour endurance test of the compressor, while the refrigerating machine oil in comparative example 2 has a low viscosity and has a viscosity of 1.16cst at 110 ℃ and 4.2MPa with the working fluid mixture of R32 because of its low viscosity, and the compressor stops due to the serious wear of the parts after the endurance test of the compressor is run for 570 hours.
Further, as for the oil discharged from the compressor in the refrigeration cycle, it does not exceed 10% even in the case where the oil discharge amount is large, so it is considered that the liquid refrigerant and the refrigerator oil are not separated together in the refrigeration cycle circuit and are introduced into the outdoor heat exchanger, and in the outdoor heat exchanger, as the liquid refrigerant is vaporized when the refrigeration system is operated at the minimum evaporation temperature such as-30 ℃, the refrigerator oil and the refrigerant are gradually separated into two layers. According to the specific embodiment and the comparative example of the invention, the refrigerating machine oil content in the lean layer area is below 25%, the refrigerant occupies the main body, the viscosity of the mixed working medium is low, and the mixed working medium can return to the compressor along with the refrigerant gas. In the oil-rich layer area, the refrigerant oil occupies the main body, and the refrigerant content in the working fluid composition respectively mixed with the refrigerant in the embodiments 1-2 and the comparative example 2 is higher than 30%, so that the viscosity of the refrigerant oil can be diluted to a certain degree, the viscosity of the mixed working medium is reduced to be below 30cst, and under the condition, the mixed working medium in the oil-rich layer can also return to the compressor along with the refrigerant gas, and the oil return property is ensured. In comparative example 1, at-30 ℃, the content of the refrigerating machine oil in the oil-rich layer is 75%, the viscosity of the mixed working medium is 65.85cst, and the oil return is slow, so that the oil-empty time of the compressor is long, and the reliability of the refrigerating device in long-term operation in a low-temperature environment cannot be guaranteed.
The refrigerator oil of the present invention using a polyol ester as a base oil can be adjusted in properties such as viscosity, density, and degree of dissolution with a refrigerant by changing the composition ratio of the raw materials, as long as the refrigerator oil is prepared from the above-mentioned polyol component and fatty acid component in a specific combination. The applicant continued to construct examples with reference to the forms of examples 1-2 and comparative examples 1-2 and found through studies that a working fluid composition consisting of a refrigerator oil and an R32 refrigerant satisfies lubricity and oil return property of a refrigeration cycle device under the following conditions, that is: the refrigerating machine oil and the R32 refrigerant are subjected to two-layer separation within the working temperature range of the refrigerating system to form an oil-poor layer and an oil-rich layer, the viscosity of the oil-rich layer is not higher than 30cst, and the viscosity of the oil-poor layer is not lower than 0.5cst when the refrigerating system is at the lowest evaporation temperature and the corresponding equilibrium pressure at the lowest evaporation temperature. Whether the oil product is suitable for the compressor or not is mainly considered according to the viscosity of a mixture of oil and a refrigerant at present, the viscosity at low temperature cannot be too high, otherwise the resistance is too large, oil return is difficult, the viscosity at high temperature cannot be too small, otherwise poor lubrication can be caused, and therefore the proportioning of the refrigerating machine oil is mainly based on the viscosity of the mixture of the oil product and the refrigerant. When the refrigerating machine oil is started at a low temperature, an oil-rich layer and an oil-poor layer are formed in the compressor, the oil-poor layer is positioned at the lower layer, if the viscosity of the oil-poor layer is lower than 0.5cst when the refrigerating system is in a lowest evaporation temperature state, a refrigerant in the oil-poor layer occupies a large proportion, the compressor sucks the oil-poor layer at the lower layer when starting, the refrigerant is basically the refrigerant, the content of the refrigerating machine oil is very low, and the compressor is easy to wear during the starting process and after starting; in a refrigeration loop, when a mixture of refrigerant and refrigerating machine oil circulates to an evaporator, the refrigerant is gasified, the content of the refrigerating machine oil is gradually increased, the mixture is layered, the evaporator is generally in a low-temperature environment, when the temperature is 0 ℃ or lower, the viscosity of the refrigerating machine oil is rapidly increased, at the moment, the dissolved amount of the refrigerant in the refrigerating machine oil is small, the refrigerating machine oil cannot return to a compressor along with the refrigerant, and the applicant finds through research and experiments that if the viscosity of an oil-rich layer is not higher than 30cst when a refrigeration system is in a lowest evaporation temperature state, the refrigeration system can ensure better oil return performance.
Further, the applicant has found that, in the refrigeration cycle system provided in the embodiment of the present invention, the refrigerating machine oil and the R32 refrigerant undergo two-layer separation in the operating temperature range of the refrigeration system (the embodiment of the present invention is described by taking-30 ℃ to 70 ℃) to form an oil-poor layer (having a small content of the refrigerating machine oil) and an oil-rich layer (having a large content of the refrigerating machine oil). In the oil-lean layer, the saturated solubility of the refrigerator oil in the R32 refrigerant is not higher than 25%, and the saturated solubility of the refrigerator oil in the R32 refrigerant is not lower than 10% at the lowest evaporation temperature and pressure of the refrigeration system; in the oil-rich layer, the saturated solubility of the R32 refrigerant in the refrigerator oil is not higher than 60%, and the saturated solubility of the R32 refrigerant in the refrigerator oil is not lower than 30% at the lowest evaporation temperature and pressure of the refrigeration system.
The viscosity of the composition formed by the refrigerating machine oil and the refrigerant after layering is required to be controlled within the range of 0.5-30 cst (at the lowest evaporation temperature) under the dissolving condition, and the refrigerating machine oil needs to be fullThe following conditions are satisfied: the refrigerator oil has a viscosity of 60-100 cst at 40 ℃ and a density of more than 1g/cm at 20 ℃3。
The viscosity, density and refrigerant separation of the refrigerator oil obtained under the above conditions are determined by the type and preparation of each raw material forming the base oil of the refrigerator oil, specifically, the type of the selected raw material alcohol, the type of the fatty acid and the mixture ratio of the two.
As described above, the refrigerating machine oil according to the embodiment of the present invention can satisfy the requirements of the long-term durability, the ultra-low-temperature startability, and the oil return test of the compressor after being mixed with the R32 refrigerant, and can be widely used in the refrigeration cycle apparatus using R32 as the refrigerant, including an air conditioner, a water heater, and the like.
The refrigerator oil according to the embodiment of the present invention is usually present in the form of a working fluid composition mixed with R32 (difluoromethane) refrigerant in a compressor of a refrigerator. The content of the refrigerating machine oil in the working fluid composition is not particularly limited, and 1 to 500 parts by mass of the refrigerating machine oil is preferably used, and more preferably 2 to 400 parts by mass of the refrigerating machine oil is used, based on 100 parts by mass of the refrigerant.
Some embodiments in this specification are described in a progressive or parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The refrigerator oil is characterized in that polyol ester synthesized by esterification of polyol and fatty acid is used as base oil, and the refrigerator oil and R32 refrigerant are subjected to two-layer separation in the working temperature range of a refrigerating system to form an oil-poor layer and an oil-rich layer; and under the state that the refrigerating system is at the lowest evaporation temperature, the viscosity of the oil-rich layer is not higher than 30cst, and the viscosity of the oil-poor layer is not lower than 0.5 cst.
2. The refrigerator oil according to claim 1, wherein the refrigerator oil has a viscosity of 60 to 100cst at 40 ℃ and a density of more than 1g/cm at 20 ℃3。
3. The refrigerator oil of claim 1,
in the lean oil layer: the saturated solubility of the refrigerator oil in the R32 refrigerant is not higher than 25%, and the saturated solubility of the refrigerator oil in the R32 refrigerant is not lower than 10% in a state where the refrigeration system is at the lowest evaporation temperature;
in the oil-rich layer: the saturated solubility of the R32 refrigerant in the refrigerator oil is not higher than 60%, and the saturated solubility of the R32 refrigerant in the refrigerator oil is not lower than 30% in a state where the refrigeration system is at the lowest evaporation temperature.
4. The refrigerator oil of claim 1 wherein the refrigeration system operating temperature ranges from-30 ℃ to 70 ℃.
5. The refrigerator oil of claim 1 wherein the polyol is at least one of neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol; the fatty acid is C4-C10And/orOr a dibasic fatty acid.
6. The refrigerator oil of claim 5 wherein the fatty acid is at least one of butyric acid, isobutyric acid, valeric acid, 2-methylbutyric acid, caproic acid, 2-methylpentanoic acid, 2-ethylhexanoic acid, 3,5, 5-trimethylhexanoic acid, adipic acid, azelaic acid, and sebacic acid.
7. The refrigerator oil of claim 5 further comprising an additive comprising at least one of an antiwear agent, an antioxidant, a passivating agent, and an acid scavenger.
8. A working fluid composition comprising the refrigerator oil of any one of claims 1 to 7 and R32 refrigerant.
9. A refrigeration cycle apparatus, comprising:
a refrigeration circuit; and
a working fluid composition according to claim 8, wherein the working fluid composition is enclosed in the refrigeration circuit and circulates in the refrigeration circuit while repeating compression, condensation, throttling, and evaporation.
10. The refrigeration cycle apparatus of claim 9, wherein the refrigeration circuit includes a compressor, a condenser, a throttling element, and an evaporator connected by piping, the compressor being a two-stage enthalpy-increasing rotary compressor.
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| CN115433619A (en) * | 2021-06-03 | 2022-12-06 | 瑞孚化工（上海）有限公司 | Refrigerating machine oil composition and application thereof |
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