Refrigerant mixture and household appliance

Abstract

The invention provides a refrigerant mixture and a household appliance, relates to the technical field of household appliances, and aims to solve the problem of low stability caused by large fluctuation of lubricating oil along with temperature influence during ultralow-temperature work. The refrigerant mixture is applied to the household appliance, the household appliance comprises a circulating flow path, and the refrigerant mixture comprises a refrigerant arranged in the circulating flow path and used as a circulating medium; and the lubricating oil is arranged in the circulating flow path, the viscosity index of the lubricating oil is larger than or equal to 120, and the solubility of the refrigerant in the lubricating oil is smaller than or equal to 60 wt% within the temperature range of-40 DEG C to 100 DEG C. According to the refrigerant mixture provided by the invention, the viscosity index of the lubricating oil is greater than or equal to 120, which shows that the viscosity of the lubricating oil is slightly influenced by temperature change, so that the lubricating oil can keep better lubricating performance in an environment with larger temperature change.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a refrigerant mixture and household appliances. Background Art

[0002] In recent years, air conditioners, heat pumps and other products have been increasingly used in low-temperature applications, and the heating operating range of related products has been as low as -25°C. For products in extremely cold regions, the operating range may even be as low as -30°C or below, and low-temperature applications have posed new challenges to the reliability of compressors.

[0003] In the current related technologies, system control and structural adjustment are usually used to ensure low-temperature applications. However, when facing ultra-low temperature applications, there are still certain defects. How to improve the reliability of ultra-low temperature heating applications is an urgent problem to be solved by personnel in this technical field.

[0004] The viscosity index is used to characterize the effect of temperature on the viscosity of lubricating oil. Conventional lubricating oil has a small viscosity index and fluctuates greatly under the influence of temperature. The viscosity fluctuates greatly at ultra-low temperatures, resulting in poor stability when working at low temperatures. In addition, at low temperatures, it also affects the solubility of the refrigerant in the lubricating oil and affects the lubrication performance of the compressor. Summary of the invention

[0005] The present invention aims to at least solve the problem that when working at ultra-low temperatures, lubricating oil fluctuates greatly with the influence of temperature, resulting in low stability.

[0006] To this end, a first aspect of the present invention provides a refrigerant mixture.

[0007] A second aspect of the present invention provides a household appliance.

[0008] The refrigerant mixture provided by the present invention is applied to household appliances, which include a circulation flow path, and the refrigerant mixture includes: a refrigerant, which is arranged in the circulation flow path and serves as a circulation medium; a lubricating oil, which is arranged in the circulation flow path, wherein the viscosity index of the lubricating oil is greater than or equal to 120, and within the temperature range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt%.

[0009] The refrigerant mixture provided by the present invention has a viscosity index of lubricating oil greater than or equal to 120, indicating that the viscosity of the lubricating oil is less affected by temperature changes, which enables the lubricating oil to maintain good lubrication performance even in an environment with large temperature changes. The viscosity index of conventional lubricating oils is less than 110, which is greatly affected by temperature. In addition, within the range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt%, that is, after the refrigerant is dissolved and saturated, the mass percentage of the mass of the refrigerant to the mass of the lubricating oil is less than or equal to 60%. Since the solubility is less than or equal to 60wt%, the lubricating oil and the refrigerant are easy to separate, which helps to improve the heat exchange efficiency of the system. In addition, even at an ultra-low temperature of -40°C, a low solubility can be guaranteed, while for common lubricating oils, as the temperature decreases, the solubility of the refrigerant in the lubricating oil gradually increases, and at low temperatures, the solubility is even greater than or equal to 80%, thereby affecting the lubrication performance of the compressor.

[0010] Generally, the viscosity of lubricating oil is affected by temperature changes. Generally, the viscosity of lubricating oil at 40°C and the viscosity of lubricating oil at 100°C are considered. The lubricating oil of the present invention has a higher viscosity index, and the viscosity at 40°C is ≤60 mm 2 / s, viscosity at 100℃≥8mm 2 / s.

[0011] In some technical solutions, optionally, in the temperature range of -40°C to -20°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60 wt %.

[0012] In some technical solutions, optionally, in the temperature range of -40°C to 0°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60 wt %.

[0013] In some technical solutions, optionally, in the temperature range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 50 wt%.

[0014] In these technical solutions, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt% in the temperature range of -40°C to 0°C. Furthermore, in the temperature range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 50wt%. That is, the refrigerant mixture of the present application has a low saturated solubility even under ultra-low temperature conditions, thereby ensuring the stability of the lubricating oil.

[0015] In some technical solutions, optionally, the viscosity index of the lubricating oil is greater than or equal to 150.

[0016] In these technical solutions, the viscosity index of the lubricating oil is greater than or equal to 150, which can further improve the stability of the lubricating oil and improve the lubrication performance, so that the refrigerant mixture of the present invention is particularly suitable for low-temperature work and has good stability at ultra-low temperatures. Optionally, the viscosity index of the lubricating oil is greater than or equal to 170.

[0017] In some technical solutions, optionally, the lubricating oil includes: base oil: dipentaerythritol ester, wherein the dipentaerythritol ester is obtained by reacting dipentaerythritol with an acid, and the number of carbon atoms in the acid is 9 to 14.

[0018] In these technical solutions, the lubricating oil includes a base oil and a dipentaerythritol ester, wherein the dipentaerythritol ester is obtained by reacting dipentaerythritol with an acid, and the number of carbon atoms of the acid is 9 to 14. The dipentaerythritol ester obtained by the reaction of an acid having multiple carbon atoms with dipentaerythritol in the present invention, and the ester compounds formed by longer-chain fatty acids generally have better viscosity characteristics and can maintain a stable viscosity of the lubricating oil in a wider temperature range, which helps to improve the viscosity index of the lubricating oil, so that it performs well under extremely high or extremely low temperature conditions. In addition, the longer-chain ester compounds often have better oxidation stability, which means that they are not easy to decompose or oxidize and deteriorate at high temperatures, thereby extending the service life of the lubricating oil. After the dipentaerythritol ester is used as an additive for the lubricating oil, the viscosity index of the lubricating oil can be greatly improved, and it is particularly suitable for HFC (Hydrofluorocarbons) refrigerants, HCFC (Hydrochlorofluorocarbons) refrigerants and HFO (Hydrofluoroolefins) refrigerants, so that these refrigerants have a lower saturated solubility, thereby improving the stability of the refrigerant mixture. If the number of carbon atoms in the fatty acid is small, the viscosity index of the lubricating oil will be greatly reduced. Of course, although long-chain esters perform better at high temperatures, they also make the fluidity relatively poor at low temperatures. Therefore, the best number of carbon atoms is 9 to 14, such as 10, 12, etc.

[0019] In some technical solutions, optionally, the acid having 9 to 14 carbon atoms may be nonanoic acid, decenoic acid, caprylic acid, undecanoic acid, lauric acid or myristic acid.

[0020] In some technical solutions, optionally, the mass ratio of the base oil to the lubricating oil is greater than or equal to 99%, and the mass ratio of the dipentaerythritol ester to the lubricating oil is less than or equal to 1%.

[0021] In this technical solution, the content of dipentaerythritol ester should not be too high, otherwise it will affect the low-temperature stability of the lubricating oil. Therefore, it is best to set the content of dipentaerythritol ester to less than or equal to 1% by mass of the lubricating oil, such as 0.5% and 0.8%.

[0022] In some technical solutions, optionally, the lubricating oil further includes one or a combination of the following: an antioxidant, a rust inhibitor, a defoaming agent, a colorant, a desiccant, and a friction modifier.

[0023] In this technical solution, antioxidants are chemicals used to prevent or delay the oxidation of refrigerants and lubricants. Oxidation can lead to the formation of sludge and deposits, which in turn affect the efficiency and life of the system. Rust inhibitors are used to prevent metal parts in the system from rusting or corroding, protecting the system from corrosive damage. Defoamers are used to reduce the formation of foam in lubricants, which can affect the performance and lubrication of lubricants. Dyes are used to mark refrigerants to facilitate leak detection. Some refrigerants are colorless by themselves, and the addition of dyes can make it easier for technicians to find leaks. Desiccants are used to remove moisture from the system. The presence of moisture can cause problems such as ice blockage and affect system performance. Friction modifiers can reduce friction between metal surfaces and improve lubrication.

[0024] In some technical solutions, optionally, the pour point of the lubricating oil is less than or equal to -45°C.

[0025] In this technical solution, the pour point of the lubricating oil is less than or equal to -45°C, that is, the lowest temperature at which the lubricating oil starts to flow is less than or equal to -45°C, so that the lubricating oil can have good fluidity even at ultra-low temperatures. Optionally, the pour point of the lubricating oil is less than or equal to -50°C. For example, -50°C.

[0026] In some technical solutions, optionally, the mass fraction ratio of the refrigerant to the lubricating oil is 1:9, and the viscosity of the refrigerant mixture is less than or equal to 600 mm at -30°C. 2 / s.

[0027] In this technical solution, under ultra-low temperature conditions, the lower viscosity makes the lubricant easier to flow, which is conducive to rapid lubrication of various components, can reduce friction losses between mechanical components, and improve the energy efficiency of the system. Optionally, the mass fraction ratio of the refrigerant to the lubricant is 1:9, and the viscosity of the refrigerant mixture is less than or equal to 500mm at -30°C. 2 / s, for example 400mm 2 / s, 450mm 2 / s.

[0028] In some technical solutions, optionally, in the temperature range of -40°C to 100°C, the maximum solubility of the refrigerant in the lubricating oil is X1, the minimum solubility is X2, and (X1-X2) / X1≤40%. That is, in the temperature range of -40°C to 100°C, the change in the solubility of the refrigerant in the lubricating oil is ≤40%, indicating that the solubility of the refrigerant in the lubricating oil is not greatly affected by the change in temperature, thereby indirectly illustrating the stability of the lubricating oil of the present invention. Optionally, the change in the solubility of the refrigerant in the lubricating oil is ≤35%, such as 35% or 30%.

[0029] In some technical solutions, optionally, the refrigerant includes one or a combination of the following: HFC refrigerant, HCFC refrigerant and HFO refrigerant.

[0030] In this technical solution, HFC refrigerants, HCFC refrigerants and HFO refrigerants are all well compatible with the lubricating oil of the present invention. Of course, it is not limited to using dipentaerythritol ester as the viscosity index modifier of the lubricating oil, and other additives can also be used to ensure the ultra-low temperature stability of the lubricating oil, so that the refrigerant can also be selected from HC (Hydrocarbons, hydrocarbon refrigerant) refrigerants.

[0031] The second aspect of the present invention provides a household appliance, comprising: a circulation flow path; and a refrigerant mixture provided by any one of the technical solutions of the first aspect of the present invention disposed in the circulation flow path. Since the household appliance provided by the present invention comprises the circulation flow path and the refrigerant mixture provided by any one of the technical solutions of the first aspect of the present invention disposed in the circulation flow path, it has all the beneficial effects of the refrigerant mixture.

[0032] In some technical solutions, optionally, the household appliance includes one of the following: an air conditioner, a heat pump and a heating device.

[0033] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 A schematic structural diagram of a household appliance according to an embodiment of the present invention is shown.

[0036] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0037] 1 household appliance, 12 compressor, 14 condenser, 16 expansion valve, 18 evaporator, 19 circulation flow path. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0040] like Figure 1 As shown, the refrigerant mixture provided in this embodiment is applied to a household appliance 1, and the household appliance 1 includes a circulation flow path 19, and the refrigerant mixture includes: a refrigerant, which is arranged in the circulation flow path 19 and serves as a circulation medium; a lubricating oil, which is arranged in the circulation flow path 19, and the viscosity index of the lubricating oil is greater than or equal to 120, and in the temperature range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt%.

[0041] The refrigerant mixture provided in this embodiment has a viscosity index of lubricating oil greater than or equal to 120, indicating that the viscosity of the lubricating oil is less affected by temperature changes, which enables the lubricating oil to maintain good lubrication performance even in an environment with large temperature changes. The viscosity index of conventional lubricating oils is less than 110, which is greatly affected by temperature. In addition, within the range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt%, that is, after the refrigerant is dissolved and saturated, the mass percentage of the mass of the refrigerant to the mass of the lubricating oil is less than or equal to 60%. Since the solubility is less than or equal to 60wt%, the lubricating oil and the refrigerant are easy to separate, which helps to improve the heat exchange efficiency of the system. In addition, even at an ultra-low temperature of -40°C, a low solubility can be guaranteed, while for common lubricating oils, as the temperature decreases, the solubility of the refrigerant in the lubricating oil gradually increases, and at low temperatures, the solubility is even greater than or equal to 80%, thereby affecting the lubrication performance of the compressor 12.

[0042] Generally, the viscosity of lubricating oil is affected by temperature changes. Generally, the viscosity of lubricating oil at 40°C and the viscosity of lubricating oil at 100°C are considered. The lubricating oil of the present invention has a higher viscosity index, and the viscosity at 40°C is ≤60 mm 2 / s, viscosity at 100℃≥8mm 2 / s.

[0043] In addition, it should be noted that if the lubricant is used as the solvent and the refrigerant is used as the solute, then the solubility of the refrigerant in the lubricant is less than or equal to 60wt%. If the refrigerant is still added after it reaches saturation, the refrigerant will no longer be a solvent. However, as the refrigerant is added in large quantities, when the refrigerant is excessive, the refrigerant becomes a solvent and the lubricant becomes a solute, which is equivalent to the lubricant dissolving in the refrigerant. At this time, the mass percentage of the mass of the refrigerant to the mass of the lubricant will be greater than or equal to 75wt%.

[0044] In some embodiments, optionally, in the temperature range of -40° C. to -20° C., the solubility of the refrigerant in the lubricating oil is less than or equal to 60 wt %. For example, the solubility is equal to 60 wt % or 55 wt %.

[0045] In some embodiments, optionally, in the temperature range of -40°C to 0°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60 wt %.

[0046] In some embodiments, optionally, in the temperature range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 50 wt %. For example, the solubility is equal to 50 wt % or 45 wt %.

[0047] In these embodiments, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt% in the temperature range of -40°C to 0°C. Furthermore, in the temperature range of -40°C to 100°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 50wt%. That is, the refrigerant mixture of the present application has a low saturated solubility even under ultra-low temperature conditions, thereby ensuring the stability of the lubricating oil.

[0048] In some embodiments, optionally, the viscosity index of the lubricating oil is greater than or equal to 150.

[0049] In these embodiments, the viscosity index of the lubricating oil is greater than or equal to 150, which can further improve the stability of the lubricating oil and the lubricating performance, so that the refrigerant mixture of the present invention is particularly suitable for low-temperature work and has good stability at ultra-low temperatures. For example, the viscosity index of the lubricating oil is equal to 150, 160 or 170.

[0050] In some embodiments, optionally, the lubricating oil includes: base oil: dipentaerythritol ester, wherein the dipentaerythritol ester is obtained by reacting dipentaerythritol with an acid, and the number of carbon atoms of the acid is 9 to 14.

[0051] In these embodiments, the lubricating oil includes a base oil and a dipentaerythritol ester, wherein the dipentaerythritol ester is obtained by reacting dipentaerythritol with an acid, and the number of carbon atoms of the acid is 9 to 14. The dipentaerythritol ester obtained by reacting an acid having multiple carbon atoms with dipentaerythritol in the present invention, and the ester compounds formed by longer-chain fatty acids generally have better viscosity characteristics, and can maintain a stable viscosity of the lubricating oil in a wider temperature range, which helps to improve the viscosity index of the lubricating oil, so that it performs well under extremely high or extremely low temperature conditions. In addition, longer-chain ester compounds often have better oxidation stability, which means that they are not easy to decompose or oxidize and deteriorate at high temperatures, thereby extending the service life of the lubricating oil. After the present invention uses dipentaerythritol ester as an additive for the lubricating oil, the viscosity index of the lubricating oil can be greatly improved, and it is particularly suitable for HFC refrigerants, HCFC refrigerants and HFO refrigerants, so that these refrigerants have a lower saturated solubility, thereby improving the stability of the refrigerant mixture. If the number of carbon atoms in the fatty acid is small, the viscosity index of the lubricating oil will be greatly reduced. Of course, although long-chain esters perform better at high temperatures, they also make the fluidity relatively poor at low temperatures. Therefore, the best number of carbon atoms is 9 to 14, such as 10, 12, etc.

[0052] In some technical solutions, optionally, the acid having 9 to 14 carbon atoms may be nonanoic acid, decenoic acid, caprylic acid, undecanoic acid, lauric acid or myristic acid.

[0053] In some embodiments, the base oil may be mineral oil, synthetic oil, vegetable oil, ester oil, etc., such as poly-α-olefin, dipentaerythritol ester, fluorinated oil, etc.

[0054] In some embodiments, optionally, the mass ratio of the base oil to the lubricating oil is greater than or equal to 99%, and the mass ratio of the dipentaerythritol ester to the lubricating oil is less than or equal to 1%.

[0055] In this embodiment, the content of dipentaerythritol ester should not be too high, otherwise it will affect the low temperature stability of the lubricating oil. Therefore, it is better to set the content of dipentaerythritol ester to less than or equal to 1% by mass of the lubricating oil, such as 0.5% and 0.8%.

[0056] In some embodiments, optionally, the lubricating oil further comprises one or a combination of the following: an antioxidant, a rust inhibitor, a defoaming agent, a colorant, a drying agent, and a friction modifier.

[0057] In this embodiment, antioxidants are chemicals used to prevent or delay oxidation of refrigerants and lubricants. Oxidation can lead to the formation of sludge and deposits, which can affect the efficiency and life of the system. Rust inhibitors are used to prevent metal parts in the system from rusting or corroding, protecting the system from corrosive damage. Defoamers are used to reduce the formation of foam in the lubricant, which can affect the performance and lubrication of the lubricant. Colorants are used to mark refrigerants to facilitate leak detection. Some refrigerants are colorless by themselves, and the addition of colorants can make it easier for technicians to find leaks. Desiccant is used to remove moisture from the system. The presence of moisture can cause problems such as ice blockage, affecting system performance. Friction modifiers can reduce friction between metal surfaces and improve lubrication.

[0058] In some embodiments, optionally, when the lubricating oil includes an antioxidant, the mass ratio of the antioxidant to the lubricating oil is less than or equal to 0.1%. When the lubricating oil includes a rust inhibitor, the mass ratio of the rust inhibitor to the lubricating oil is less than or equal to 0.1%. When the lubricating oil includes a defoaming agent, the mass ratio of the defoaming agent to the lubricating oil is less than or equal to 0.1%. When the lubricating oil includes a coloring agent, the mass ratio of the coloring agent to the lubricating oil is less than or equal to 0.1%. When the lubricating oil includes a desiccant, the mass ratio of the desiccant to the lubricating oil is less than or equal to 0.1%. When the lubricating oil includes a friction modifier, the mass ratio of the friction modifier to the lubricating oil is less than or equal to 0.1%.

[0059] In some embodiments, optionally, the pour point of the lubricating oil is less than or equal to -45°C.

[0060] In this embodiment, the pour point of the lubricating oil is less than or equal to -45°C, that is, the lowest temperature at which the lubricating oil starts to flow is less than or equal to -45°C, which can ensure that the lubricating oil has good fluidity even at ultra-low temperatures. Optionally, the pour point of the lubricating oil is less than or equal to -50°C. For example, -50°C.

[0061] In some embodiments, optionally, the mass fraction ratio of the refrigerant to the lubricant is 1:9, and the viscosity of the refrigerant mixture is less than or equal to 600 mm at -30°C. 2 / s.

[0062] In this embodiment, under ultra-low temperature conditions, the lower viscosity makes the lubricating oil flow more easily, which is conducive to rapid lubrication of various components, can reduce friction losses between mechanical components, and improve the energy efficiency of the system. Optionally, the mass fraction ratio of the refrigerant to the lubricating oil is 1:9, and the viscosity of the refrigerant mixture is less than or equal to 500mm at -30°C. 2 / s, for example 400mm 2 / s, 450mm 2 / s.

[0063] In some embodiments, optionally, in the temperature range of -40°C to 100°C, the maximum solubility of the refrigerant in the lubricating oil is X1, the minimum solubility is X2, and (X1-X2) / X1≤40%. That is, in the temperature range of -40°C to 100°C, the change in the solubility of the refrigerant in the lubricating oil is ≤40%, indicating that the solubility of the refrigerant in the lubricating oil is not greatly affected by the change in temperature, thereby indirectly illustrating the stability of the lubricating oil of the present invention. Optionally, (X1-X2) / X1≤35%, for example, 35% or 30%.

[0064] In some embodiments, optionally, the refrigerant comprises one or a combination of the following: HFC refrigerant, HCFC refrigerant, and HFO refrigerant.

[0065] In this embodiment, HFC refrigerant, HCFC refrigerant and HFO refrigerant are all well compatible with the lubricating oil of the present invention. Of course, it is not limited to using dipentaerythritol ester as the viscosity index modifier of the lubricating oil, and other additives can also be used to ensure the ultra-low temperature stability of the lubricating oil, so that the refrigerant can also be selected from HC refrigerant.

[0066] like Figure 1 As shown, the second aspect of the present invention provides a household appliance 1, comprising: a circulation flow path 19; and a refrigerant mixture provided by any embodiment of the first aspect of the present invention disposed in the circulation flow path 19. Since the household appliance 1 provided by the present invention comprises the circulation flow path 19 and the refrigerant mixture provided by any embodiment of the first aspect of the present invention disposed in the circulation flow path 19, it has all the beneficial effects of the refrigerant mixture.

[0067] In some embodiments, optionally, the household appliance 1 includes one of the following: an air conditioner, a heat pump, and a heating device.

[0068] The household appliance 1 provided by the present invention further includes a compressor 12, a condenser 14, an expansion valve 16 and an evaporator 18. The compressor 12 is the heart of the heating cycle, which compresses the low-temperature and low-pressure gaseous refrigerant from the evaporator 18 into a high-temperature and high-pressure gas. The outlet of the compressor 12 is connected to the inlet of the condenser 14. The condenser 14 receives the high-temperature and high-pressure gaseous refrigerant from the compressor 12. In the condenser 14, the refrigerant is cooled and condensed into a liquid by dissipating heat to the external environment (usually air or water). The outlet of the condenser 14 is connected to the inlet of the expansion valve 16. The function of the expansion valve 16 is to reduce the pressure of the high-temperature and high-pressure liquid refrigerant from the condenser 14 into a low-temperature and low-pressure liquid refrigerant. The outlet of the expansion valve 16 is connected to the inlet of the evaporator 18. The evaporator 18 receives low-temperature, low-pressure liquid refrigerant from the expansion valve 16. In the evaporator 18, the refrigerant absorbs heat from the surrounding environment (such as indoor air) and evaporates into gas. The outlet of the evaporator 18 is connected back to the inlet of the compressor 12, completing a complete heating or cooling cycle.

[0069] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A refrigerant mixture, characterized in that: Applied to household electrical appliances, the household electrical appliances include a circulation flow path, and the refrigerant mixture includes: A refrigerant is provided in the circulation flow path and serves as a circulation medium; Lubricating oil is arranged in the circulation flow path, the viscosity index of the lubricating oil is greater than or equal to 120, and the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt% in the temperature range of -40°C to 100°C.

2. The refrigerant mixture according to claim 1, characterized in that: When the refrigerant mixture is within a temperature range of -40°C to -20°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60 wt %; or When the refrigerant mixture is within a temperature range of -40°C to 0°C, the solubility of the refrigerant in the lubricating oil is less than or equal to 60wt%; or The solubility of the refrigerant in the lubricating oil is less than or equal to 50 wt % within the temperature range of -40°C to 100°C of the refrigerant mixture; or The viscosity index of the lubricating oil is greater than or equal to 150.

3. The refrigerant mixture according to claim 1, characterized in that: The lubricating oil comprises: Base Oil: Dipentaerythritol ester, wherein the dipentaerythritol ester is obtained by reacting dipentaerythritol with an acid, and the number of carbon atoms of the acid is 9 to 14.

4. The refrigerant mixture according to claim 3, characterized in that: The mass ratio of the base oil to the lubricating oil is greater than or equal to 99%, and the mass ratio of the dipentaerythritol ester to the lubricating oil is less than or equal to 1%.

5. The refrigerant mixture according to claim 1, characterized in that: The pour point of the lubricating oil is less than or equal to -45°C.

6. The refrigerant mixture according to claim 1, characterized in that: The mass fraction ratio of the refrigerant to the lubricating oil is 1:9, and the viscosity of the refrigerant mixture is less than or equal to 600 mm at -30°C. 2 / s.

7. The refrigerant mixture according to claim 1, characterized in that: In the temperature range of -40°C to 100°C, the maximum solubility of the refrigerant in the lubricating oil is X1, the minimum solubility is X2, and (X1-X2) / X1≤40%.

8. The refrigerant mixture according to any one of claims 1 to 7, characterized in that: The refrigerant comprises one or a combination of the following: HFC refrigerant, HCFC refrigerant and HFO refrigerant.

9. A household appliance, characterized in that: include: Circulation flow path; A refrigerant mixture according to any one of claims 1 to 8 provided in the circulation flow path.

10. The household appliance according to claim 9, characterized in that: The household electrical appliance includes one of the following: an air conditioner, a heat pump and a heating device.

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