Compositions, methods of making the same, compressors, and refrigeration systems

Abstract

Disclosed are a composition, a method for preparing the same, a compressor and a refrigeration system. The method comprises: providing a composite refrigerant containing at least 15 wt% of HFO refrigerant and at least 55 wt% of HFC refrigerant; and determining the composition of the refrigeration oil based on the composition of the composite refrigerant, so that the composition meets the following requirement when the oil content of the refrigeration oil mass is in a predetermined range: the refrigerant and the refrigeration oil are phase-separated during the refrigeration system cycle operation within -30 DEG C to 20 DEG C. The composition obtained by the method has a low GWP value, and can ensure the reliable sealing and lubrication of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressors and refrigeration devices, and more specifically, to compositions thereof, methods of their preparation, compressors, and refrigeration systems. Background Technology

[0002] In existing refrigeration cycle systems, the compressor is a key component of the refrigeration unit, and ensuring its reliability is crucial. The compressor contains a composition of refrigeration oil and refrigerant, which can be compatible or separate under certain conditions. The refrigeration oil supplies lubrication to components such as the compressor mechanism, ensuring lubrication and reducing wear. The refrigerant vaporizes under the action of the compressor mechanism and circulates within the refrigeration cycle system, achieving the cooling effect. However, with the implementation of the Kigali Amendments, traditional HFO refrigerants, such as R410A, R134a, R404A, and even R32, are gradually being phased out due to their high GWP values. New or composite refrigerants with lower GWP values ​​are emerging to replace pure HFO refrigerants in the preparation of refrigeration oil and refrigerant compositions.

[0003] However, changes in the composition of the refrigerant will alter the compatibility between the refrigerant and the refrigeration oil in the composition, and their compatibility is crucial for the compressor's sealing and lubrication.

[0004] Therefore, the current compositions, their preparation methods, compressors, and refrigeration systems still need improvement. Summary of the Invention

[0005] The present invention aims to alleviate or even solve at least one of the above problems to a certain extent.

[0006] In one aspect of the invention, a method for preparing a composition for a refrigeration device is provided. The method includes: providing a composite refrigerant containing at least 15 wt% HFO refrigerant and at least 55 wt% HFC refrigerant; and determining the composition of a refrigeration oil based on the composition of the composite refrigerant, such that the composition, when the oil content of the refrigeration oil is within a predetermined range, satisfies the following requirement: during refrigeration system cycle operation within a temperature range of -30°C to 20°C, the refrigerant and refrigeration oil separate. The composition obtained by this method has advantages such as a low GWP value, ensuring reliable sealing and lubrication of the compressor.

[0007] According to embodiments of the present invention, the composition of the composite refrigerant includes selecting an HFO refrigerant with a higher polarity than the HFC refrigerant, and ensuring that the GWP value of the composite refrigerant is lower than that of the HFC-R32. This reduces the GWP value of the composition, resulting in a more environmentally friendly option.

[0008] According to embodiments of the present invention, the HFO refrigerant includes HFO-1234yf, and the HFC refrigerant includes at least one of HFC-R32, HFC-R410A, HFC-R134a, and HFC-R404A. Providing a composite refrigerant involves containing 30-35 wt% HFO refrigerant and 60-70 wt% HFC refrigerant. This allows the composite refrigerant to contain a higher proportion of HFO refrigerant, thereby further reducing the GWP value of the composition while maintaining good refrigeration performance.

[0009] According to an embodiment of the present invention, the composition of the refrigeration oil is selected from at least one of PAG and POE. This further improves the performance of the composition.

[0010] According to an embodiment of the present invention, the content of the refrigeration oil is adjusted so that the refrigerant and refrigeration oil separate during the refrigeration system cycle operation within the range of -30°C to 20°C. This results in a smaller amount of refrigerant dissolved in the composition at lower temperatures, preventing excessive decrease in refrigeration oil viscosity, and thus improving the sealing performance of internal compressor components caused by oil film rupture.

[0011] According to an embodiment of the present invention, the composition of the refrigeration oil is determined based on the composition of the composite refrigerant and the solubility of the composite refrigerant in the refrigeration oil, and the solubility viscosity of the composition in the compressor online test is not less than 1.8 within the range of -30°C to 20°C. This further improves the sealing performance of the composition for compressor components during low-temperature operation.

[0012] According to embodiments of the present invention, determining the composition of the refrigeration oil further includes ensuring that the composition meets the following requirements: the refrigeration oil has an oil content in the range of 15% to 45% and a temperature in the range of -30°C to 60°C; the refrigeration oil and the composite refrigerant undergo two-phase separation; the refrigeration oil has an oil content of less than 5% and a temperature in the range of 20°C to 40°C; and the refrigeration oil has an oil content of more than 55% and a temperature in the range of 25°C to 55°C; the composite refrigerant and the refrigeration oil are miscible. This further improves the reliability of compressors using this composition.

[0013] In another aspect of the invention, a composition is provided. This composition is obtained using the method described above. Therefore, this composition possesses all the features and advantages of compositions obtained by the aforementioned method, which will not be repeated here. In general, this composition has a low GWP value and good compressor operating reliability.

[0014] In another aspect, the present invention provides a compressor. The compressor includes a housing, and inside the housing are a motor, an eccentric crankshaft, and a compression mechanism. The housing contains the aforementioned composition. The motor and the eccentric crankshaft are connected to drive the eccentric crankshaft to rotate and compress the composite refrigerant in the composition within the compression mechanism. Refrigeration oil in the composition is configured to supply oil to the compression mechanism and the eccentric crankshaft. Thus, the compressor possesses at least one of the advantages of being more environmentally friendly and having higher reliability.

[0015] According to an embodiment of the present invention, the refrigeration oil is located in the refrigeration oil containment space at the bottom of the compressor housing.

[0016] In another aspect, the present invention provides a refrigeration system comprising the compressor described above. Thus, this refrigeration system possesses at least one of the advantages of being more environmentally friendly and having higher reliability. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 A flowchart illustrating a method according to an embodiment of the present invention is shown;

[0019] Figure 2 A schematic diagram of a compressor according to an embodiment of the present invention is shown;

[0020] Figure 3 A schematic diagram of a refrigeration system according to an embodiment of the present invention is shown;

[0021] Figure 4 A graph showing the compatibility behavior of a refrigerant with refrigeration oil of a composition according to an embodiment of the present invention is displayed.

[0022] Figure 5 A coordinate graph showing the refrigerant compatibility behavior of a composition according to another embodiment of the present invention with refrigeration oil is displayed. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and are not intended to require that this invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] In one aspect, the present invention provides a method for preparing a composition for a refrigeration device. This method adjusts the composition of the refrigeration oil based on the composition of the composite refrigerant, ultimately obtaining a composition with a low GWP value that provides reliable sealing and lubrication for the compressor. The composition provided by this method exhibits excellent performance, and the composition of the refrigeration oil can be flexibly adjusted to obtain a composition that provides reliable protection for the compressor when the composite refrigerant components are changed. This method is applicable to combinations of various composite refrigerants.

[0026] The method will now be described in detail according to specific embodiments of the present invention. (Refer to...) Figure 1 The method includes:

[0027] S100: Provides composite refrigerant

[0028] According to an embodiment of the present invention, a composite refrigerant is first provided in this step. As mentioned above, single-component refrigerants, especially those containing HFO components, are difficult to meet usage requirements due to their high GWP values, thus necessitating the addition of more environmentally friendly components to form composite refrigerants. One option is to add HFC refrigerants to HFO refrigerants, utilizing the generally lower GWP values ​​of HFC refrigerants to achieve better environmental performance. However, HFC refrigerants generally have low polarity and weak chemical stability, therefore, single-component HFC refrigerants cannot be directly used as refrigerants.

[0029] According to embodiments of the present invention, the specific chemical composition of the multi-component refrigerant in the aforementioned composite refrigerant is not particularly limited, and those skilled in the art can select and determine it according to the actual requirements of the compressor and the requirements for GWP value. For example, according to some examples of the present invention, in this step, the chemical composition of the HFC refrigerant to be used can be determined first, and then an HFO refrigerant with greater polarity than the HFC refrigerant can be selected. By using the low GWP value of the selected HFC refrigerant, the GWP value of the composite refrigerant is made lower than that of HFC-R32. Thus, the GWP value of the composition can be reduced, giving it a more environmentally friendly advantage.

[0030] According to an embodiment of the present invention, in this step, the content of the two refrigerants in the composite refrigerant is determined based on the specific chemical composition of the selected HFO and HFC refrigerants, such that the composite refrigerant contains at least 15 wt% HFO refrigerant and at least 55 wt% HFC refrigerant. The inventors have found that when the content of the two refrigerants is above the aforementioned levels, on the one hand, the refrigerant cooling effect is better, and on the other hand, the stability of the composite refrigerant can be guaranteed. Furthermore, the polarity of the composite refrigerant and its solubility relative to refrigeration oil change less, allowing it to be matched with a wider range of refrigeration oil components, thus offering the advantage of reduced research and development costs.

[0031] According to some specific embodiments of the present invention, the HFC refrigerant includes at least one of HFC-R32, HFC-R410A, HFC-R134a, and HFC-R404A, and the HFO refrigerant may include HFO-1234yf. More specifically, the composite refrigerant contains 30-35 wt% HFO refrigerant and 60-70 wt% HFC refrigerant. For example, in some examples, based on the total weight of the composite refrigerant, it may contain 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, or 35 wt% HFO refrigerant, such as specifically 30-33 wt% HFO-1234yf. Based on the total weight of the composite refrigerant, it may contain 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, or 70 wt% HFC refrigerant, specifically 65-69 wt% HFC-R32. Therefore, the composite refrigerant can contain more HFO refrigerant, which can further reduce the GWP value of the composition while maintaining a good refrigeration effect. In addition, the composite refrigerant has good stability and is not prone to releasing too many acidic products during operation.

[0032] S200: Based on the composition of the composite refrigerant, determine the composition of the refrigeration oil.

[0033] According to an embodiment of the present invention, in this step, the composition of the refrigeration oil is determined based on the composition of the composite refrigerant determined in the preceding steps, i.e., the chemical composition and content of each component in the composite refrigerant. Specifically, the chemical composition and content of the refrigeration oil are determined. The composition and content of the refrigeration oil selected in this step need to ensure that the refrigerant and refrigeration oil exhibit phase separation during the refrigeration system cycle operation within a predetermined range of -30°C to 20°C when the oil content of the refrigeration oil is within a predetermined range. Thus, the composition is obtained. The composition obtained by this method has advantages such as a low GWP value, ensuring reliable sealing and lubrication of the compressor.

[0034] The inventors discovered that when the selected composition contains refrigerants with low chemical polarity (HFO type) and is combined with refrigeration oils with high solubility in synthetic oils such as POE and PAG, the refrigerant solubility is high in the lower operating range of the compressor. This means that a certain amount of refrigerant will dissolve in the refrigeration oil used for lubricating components inside the compressor, leading to a decrease in the viscosity of the refrigeration oil in the compressor, insufficient sealing of components, or oil film rupture. Ultimately, this results in insufficient lubrication of compressor components, wear of moving parts, and a significant reduction in compressor reliability and lifespan. The composition obtained using the aforementioned method, in system circulation, especially at lower temperatures, shows phase separation between the refrigerant and refrigeration oil. These combinations result in less refrigerant dissolution and increased viscosity at lower temperatures, which can better improve the sealing of internal compressor components and prevent oil film rupture, making it easier to achieve fluid lubrication and significantly improving compressor reliability.

[0035] When the composition has an oil content within a predetermined range, meaning that the percentage of refrigeration oil by mass in the composition is within a predetermined range, the composition can meet the aforementioned requirements. The predetermined range is a range of oil content, which can be determined based on the performance requirements of the compressor to which the composition is applied. For example, in some examples of the present invention, the predetermined range may include a range with an oil content greater than 15%, specifically, an oil content between 15% and 45%. In other examples, the predetermined range may include cases where the oil content is greater than 20%, specifically, an oil content between 20% and 60%.

[0036] According to embodiments of the present invention, in this step, the chemical composition of the refrigeration oil can be determined first. According to some embodiments of the present invention, the composition of the refrigeration oil can be selected from at least one of PAG, PVE, and POE. This can further improve the performance of the composition. For example, the refrigeration oil can be selected to contain one or more of PAG, POE, and PVE. More specifically, the refrigeration oil can be selected as a POE-type refrigeration oil.

[0037] According to an embodiment of the present invention, in this step, in addition to ensuring that the composite refrigerant meets the aforementioned requirements, the composition of the refrigeration oil can be further adjusted by regulating the composition and content of the refrigeration oil based on the solubility of the composite refrigerant in the refrigeration oil. This ensures that the solubility viscosity of the composition in the compressor online test is not less than 1.8 within the range of -30°C to 20°C. This further improves the sealing performance of the composition for compressor components during low-temperature operation.

[0038] According to an embodiment of the present invention, determining the composition of the refrigeration oil further includes enabling the composition to satisfy at least one of the following requirements:

[0039] When the composition is used in refrigeration oil with an oil content of 15%–45% and a temperature of -30°C–60°C, the refrigeration oil and the composite refrigerant undergo two-layer phase separation during compressor operation. When the composition is used in refrigeration oil with an oil content of less than 5% and a temperature of 20°C–40°C, the composite refrigerant and the refrigeration oil are miscible during compressor operation. When the composition is used in refrigeration oil with an oil content of 55% or more and a temperature of 25°C–55°C, the composite refrigerant and the refrigeration oil are miscible during compressor operation. Therefore, the reliability of compressors using this composition can be further improved.

[0040] Specifically, the composition can be further designed to allow for phase separation of the refrigeration oil and the composite refrigerant during compressor operation over a wide temperature range, specifically -30°C to 60°C. This ensures that within the aforementioned temperature range during compressor operation, the amount of refrigerant dissolved in the refrigeration oil is low, allowing the compressor components to be adequately lubricated by the higher concentration of the refrigeration oil component. This benefits fluid lubrication and the lubrication and reliability of the compressor's moving parts. Furthermore, when the refrigeration oil content is below 5% and the temperature is between 20°C and 40°C, the composite refrigerant and the refrigeration oil are miscible during compressor operation. When the refrigeration oil content is above 55% and the temperature is between 25°C and 55°C, the composite refrigerant and the refrigeration oil are also miscible. Under these conditions, the refrigeration oil and refrigerant in the composition circulate together in the refrigeration system, which facilitates oil return to the compressor in the refrigeration cycle system and provides stable and continuous lubrication for the compression components. In some specific examples, the stratification range between the refrigeration oil and the composite refrigerant in the composition within a specific temperature and oil content range can be as follows: Figure 4 As shown, in a composition with an oil content of 20-60% and a temperature range of -30 to 20 degrees Celsius, the refrigeration oil and refrigerant undergo two-phase separation. At a relatively wide temperature range (e.g., -40 to 80 degrees Celsius) with an oil content below 20%, they are miscible. At low and high temperatures, below -30 degrees Celsius and above 20 degrees Celsius, the composition exhibits miscibility between the refrigeration oil and refrigerant across a broad oil content range. Therefore, this composition allows for stratification of the refrigeration oil and refrigerant over a relatively wide range of compressor operating temperatures, resulting in good oil film sealing. Simultaneously, their miscibility in extremely low and high temperature ranges facilitates oil return from the compressor. Alternatively, within a specific temperature and oil content range, the stratification intervals between the refrigeration oil and refrigerant in this composition can be as follows: Figure 5As shown. In this case, the composition exhibits stratification of the refrigeration oil and the composite refrigerant when the oil content is low, such as 15%–45%. However, the stratification occurs over a wide temperature range, from -40°C to 80°C. This allows for stratification of the refrigeration oil and refrigerant at most compressor operating temperatures, ensuring good compressor reliability. In other temperature ranges, the two (refrigeration oil and composite refrigerant) are miscible, which facilitates oil return from the compressor in the refrigeration cycle system.

[0041] In another aspect of the invention, a composition is provided. This composition is obtained using the method described above. Therefore, this composition possesses all the features and advantages of compositions obtained by the aforementioned methods, which will not be repeated here. In general, this composition has a low GWP value and good compressor operating reliability.

[0042] In another aspect, the present invention provides a compressor. (See reference...) Figure 2 The compressor includes a housing 110, a motor 120, an eccentric crankshaft 130, and a compression mechanism 140 located inside the housing. The internal unit contains the aforementioned composition 200. Specifically, the motor and the eccentric crankshaft 130 are connected to drive the eccentric crankshaft to rotate and compress the composite refrigerant in the composition within the compression mechanism. Refrigeration oil in the composition is configured to supply oil to the compression mechanism and the eccentric crankshaft. The composite refrigerant in the composition is vaporized under the action of the compressor and can be output from the compressor to a mass system having the compressor for cyclic refrigeration. Therefore, this compressor has at least one of the advantages of being more environmentally friendly and having higher reliability.

[0043] According to an embodiment of the present invention, the refrigeration oil is located in the refrigeration oil accommodating space at the bottom of the compressor housing. The motor 120 may consist of a stator 10 and a rotor 20, the rotor 20 being connected to an eccentric crankshaft 130 and driving the eccentric crankshaft to rotate. The rotating eccentric crankshaft can compress the composite refrigerant in the composition in the compression mechanism. The refrigeration oil is preferably located at the bottom of the compressor to supply oil to the eccentric crankshaft and the compression mechanism, providing lubrication.

[0044] In another aspect, the present invention provides a refrigeration system. (See reference...) Figure 3 The system includes the compressor 100 described above. Therefore, the refrigeration system has at least one of the advantages of being more environmentally friendly and having higher reliability.

[0045] Specifically, the refrigeration system may include the aforementioned compressor 100, as well as a condenser 300, a throttling mechanism 400, and an evaporator 500. These components are interconnected to form a system capable of circulating a composite refrigerant. The compressor 100 compresses the refrigerant 210 into a high-temperature, high-pressure gas, which flows into the condenser 300. In the condenser, the refrigerant 210 releases heat and becomes a high-temperature, high-pressure liquid. After passing through the throttling mechanism, it becomes a low-temperature, low-pressure liquid and flows into the evaporator. In the evaporator, the refrigerant absorbs heat and becomes a low-temperature, low-pressure gas, which then flows back into the compressor, forming a cycle. The circulation direction of the composite refrigerant in this system is shown by the arrow in the figure.

[0046] The present invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the invention in any way. Unless otherwise specified, all reagents used in the following embodiments are commercially available.

[0047] Example 1

[0048] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 33 wt% HFO-1234yf and 66 wt% HFC-R32.

[0049] Refrigeration oil is provided: The refrigeration oil contains POE compounds. Based on the total mass of the composition, the oil content (refrigeration oil mass percentage) of the refrigeration oil is 25 wt%.

[0050] Example 2

[0051] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 33 wt% HFO-1234yf and 66 wt% HFC-R32.

[0052] Refrigeration oil is provided: The refrigeration oil contains POE compounds. Based on the total mass of the composition, the oil content (refrigeration oil mass percentage) of the refrigeration oil is 2 wt%.

[0053] Example 3

[0054] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 33 wt% HFO-1234yf and 66 wt% HFC-R32.

[0055] Refrigeration oil is provided: The refrigeration oil contains POE compounds. Based on the total mass of the composition, the oil content (refrigeration oil mass percentage) of the refrigeration oil is 60 wt%.

[0056] Example 4

[0057] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 31 wt% HFO-1234yf and 69 wt% HFC-R32.

[0058] Refrigeration oil is provided: The refrigeration oil contains POE compounds. Based on the total mass of the composition, the oil content (refrigeration oil mass percentage) of the refrigeration oil is 20%.

[0059] Example 5

[0060] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 32 wt% HFO-1234yf and 68 wt% HFC-R32.

[0061] Refrigeration oil is provided: The refrigeration oil contains POE compounds and has an oil content (percentage of refrigeration oil by mass) of 22%.

[0062] Comparative Example 1

[0063] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 30 wt% HFO-1234yf and 70 wt% HFC-R32.

[0064] Refrigeration oil is provided: The refrigeration oil contains POE compounds and has an oil content (percentage of refrigeration oil by mass) of 22%.

[0065] Comparative Example 2

[0066] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 25 wt% HFO-1234yf and 75 wt% HFC-R32.

[0067] Refrigeration oil is provided: The refrigeration oil contains POE compounds and has an oil content (percentage of refrigeration oil by mass) of 20%.

[0068] Comparative Example 3

[0069] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 35 wt% HFO-1234yf and 65 wt% HFC-R32.

[0070] Refrigeration oil is provided: The refrigeration oil contains POE compounds and has an oil content (percentage of refrigeration oil by mass) of 60%.

[0071] Comparative Example 4

[0072] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 26 wt% HFO-1234yf and 74 wt% HFC-R32.

[0073] Refrigeration oil is provided: The refrigeration oil contains POE compounds and has an oil content (percentage of refrigeration oil by mass) of 5%.

[0074] Comparative Example 5

[0075] The compound refrigerant is provided: Based on the total content of the compound refrigerant, the compound refrigerant contains 28 wt% HFO-1234yf and 72 wt% HFC-R32.

[0076] Refrigeration oil is provided: The refrigeration oil contains POE compounds and has an oil content (percentage of refrigeration oil by mass) of 60%.

[0077] The stratification state of Examples 1-5 and Comparative Examples 1-5 at different temperatures was tested, and the test results are shown in Table 1 below:

[0078] Table 1

[0079]

[0080]

[0081] The online viscosity of the compressors in Examples 4 and 5, and Comparative Examples 4 and 5 was tested under the following conditions:

[0082] The viscosity test was performed according to the JIS K2283 viscosity test method and the temperature conditions corresponding to the chart in the embodiment.

[0083] The solubility years of Examples 4 and 5 are both above 2, specifically 2.2 and 2.4 respectively, while the solubility year of Comparative Example 4 is only 1.7 and that of Comparative Example 5 is 1.8. From the above results, it can be seen that the refrigerant and refrigeration oil combination of the compositions provided by this invention in Examples 4 and 5 has a higher viscosity, which can better improve the sealing of the internal components of the compressor and prevent oil film rupture, making it easier to achieve fluid lubrication and greatly improving the reliability of the compressor.

[0084] In the description of this specification, references to terms such as "one embodiment," "another embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. Additionally, it should be noted that in this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0085] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a composition for a refrigeration device, characterized in that, include: A composite refrigerant is provided, wherein the composite refrigerant contains at least 31-33 wt% HFO refrigerant and 66-69 wt% HFC refrigerant; and Based on the composition of the composite refrigerant, the composition of the refrigeration oil is determined so that when the oil content of the refrigeration oil is within a predetermined range, the composition meets the following requirement: during the refrigeration system cycle operation within the range of -30℃ to 20℃, the refrigerant and refrigeration oil separate into phases. The HFO refrigerant includes HFO-1234yf, and the HFC refrigerant includes at least one of HFC-R32, HFC-R410A, HFC-R134a, and HFC-R404A. The composition of the refrigeration oil is selected from POE.

2. The method according to claim 1, characterized in that, Determining the composition of the composite refrigerant includes selecting an HFO refrigerant with a higher polarity than the HFC refrigerant, and ensuring that the GWP value of the composite refrigerant is lower than that of HFC-R32.

3. The method according to claim 1, characterized in that, The content of the refrigeration oil is adjusted so that the refrigerant and refrigeration oil separate during the refrigeration system cycle operation of the composition within the range of -30°C to 20°C.

4. The method according to claim 2, characterized in that, Based on the composition of the composite refrigerant and its solubility in the refrigeration oil, the composition of the refrigeration oil is determined, and the solubility viscosity of the composition in the compressor online test is not less than 1.8 within the range of -30℃ to 20℃.

5. The method according to claim 2, characterized in that, Determining the composition of the refrigeration oil further includes ensuring that the composition meets the following requirements: When the oil content of the refrigeration oil is in the range of 15-45% and the temperature is in the range of -30℃ to 60℃, the refrigeration oil and the composite refrigerant undergo two-layer phase separation. When the oil content of the refrigeration oil is below 5% and the temperature is in the range of 20℃ to 40℃, and when the oil content of the refrigeration oil is above 55% and the temperature is in the range of 25℃ to 55℃, the composite refrigerant and the refrigeration oil are miscible.

6. A composition, characterized in that, It is obtained by using the method described in any one of claims 1-5.

7. A compressor, characterized in that, The device includes a housing, and a motor, an eccentric crankshaft, and a compression mechanism located inside the housing, wherein the internal mechanism has the composition of claim 6. The motor is connected to the eccentric crankshaft to drive the eccentric crankshaft to rotate and compress the composite refrigerant in the composition in the compression mechanism. The refrigeration oil in the composition is configured to supply oil to the compression mechanism and the eccentric crankshaft.

8. The compressor according to claim 7, characterized in that, The refrigeration oil is located in the refrigeration oil containment space at the bottom of the compressor housing.

9. A refrigeration system comprising the compressor of claim 7.

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