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CN-122015355-A - Matching method of low-temperature adaptive refrigerating oil and refrigerant of double-rotor compressor

CN122015355ACN 122015355 ACN122015355 ACN 122015355ACN-122015355-A

Abstract

The invention discloses a matching method of low-temperature adaptive refrigerating oil and refrigerant of a double-rotor compressor, belongs to the technical field of refrigeration cycle optimization of vehicle air conditioners, and provides a general and low-cost overall solution for solving the problems that the viscosity of the refrigerating oil is high, the refrigerant adaptation is single and the refrigerant is easy to avoid in the prior art at low temperature. The method comprises the steps of selecting POE synthetic refrigeration oil which has the kinematic viscosity of 32mm 2 /s at 40 ℃ and the pour point of less than or equal to-40 ℃ and is mutually soluble with multiple refrigerants, adjusting the filling quantity difference to 95-108% of rated value according to the physical properties of different refrigerants such as R32, R410A, R a, R1234yf, R290 and R454B, R452B, and adopting a nitrogen purging pipeline of 0.8-1.0MPa before filling. According to the scheme, the structure of the compressor is not required to be changed, the cost is increased by 3% -5%, the double-rotor compressor can stably operate at a low temperature below-15 ℃, the heating capacity is kept above 3500W at a ring temperature of-12 ℃, the current main stream and future novel environment-friendly refrigerants are adapted, and the patent protection range and application scene are effectively expanded.

Inventors

  • WANG HENG
  • Wei Zixue
  • JIANG JINLIN

Assignees

  • 太仓京和机电有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The low-temperature adaptive refrigerating oil and refrigerant proportioning method of the double-rotor compressor is characterized by comprising the following steps of: Step S1, selecting synthetic refrigeration oil suitable for a low-temperature working condition below-15 ℃, wherein the synthetic refrigeration oil has a 40 ℃ kinematic viscosity of 32 mm 2 /S, a pour point of less than or equal to-40 ℃ and good intersolubility with various refrigerants; s2, adjusting the refrigerant filling amount to 95-108% of the rated filling amount of the target air conditioning system according to the type of the selected refrigerant; And step S3, performing adaptation verification, namely starting the compressor to run for a preset time, detecting the running current and the exhaust temperature of the compressor, and if the running current is in the range of 8A to 10A and the exhaust temperature is in the range of 75 ℃ to 85 ℃, confirming that the adaptation is completed.
  2. 2. The method of claim 1, wherein the refrigerant is at least one selected from the group consisting of R32, R410A, R a, R1234yf, R290, R454B, and R452B.
  3. 3. The method for matching refrigerant with low-temperature-adaptive refrigerant of dual-rotor compressor as set forth in claim 1, wherein said synthetic refrigerant is POE refrigerant oil having an kinematic viscosity at 100 ℃ of 5mm 2 /s to 7 mm 2 /s.
  4. 4. The method of matching refrigerant oil to refrigerant for a dual rotor compressor as set forth in claim 2, wherein when said refrigerant is R32, the charge is 105% to 108% of said nominal charge.
  5. 5. The method of matching refrigerant to refrigerant for a dual rotor compressor as set forth in claim 2, wherein when said refrigerant is R290, the charge is 95% to 100% of said rated charge.
  6. 6. The method of matching refrigerant to refrigerant for a dual rotor compressor as set forth in claim 2, wherein when said refrigerant is R410A, R a or R1234yf, the charge is 100% to 102% of said rated charge.
  7. 7. The method of matching refrigerant oil to refrigerant for a dual rotor compressor as set forth in claim 2, wherein when said refrigerant is R454B or R452B, the charge is 102% to 105% of said nominal charge.
  8. 8. The method for matching refrigerant oil with refrigerant according to any one of claims 1 to 7, wherein in the step S2, refrigerant filling is performed by a weighing method, and the filling precision error is less than or equal to + -5 g.
  9. 9. The method for matching refrigerant oil with refrigerant according to any one of claims 1 to 7, wherein in the step S3, the preset time is 30 minutes, and after the preliminary verification is completed, the compressor needs to be continuously operated for at least 4 hours, and no abnormal alarm or shutdown is generated, so that the final matching is considered to be successful.
  10. 10. The method for matching refrigerant oil to refrigerant for a dual rotor compressor as claimed in any one of claims 1 to 7, further comprising a pretreatment step of purging the compressor piping with nitrogen gas having a pressure of 0.8 MPa to 1.0MPa for a period of not less than 5 minutes before performing said step S1.

Description

Matching method of low-temperature adaptive refrigerating oil and refrigerant of double-rotor compressor Technical Field The invention belongs to the technical field of optimization of refrigeration cycle of an air conditioner for a vehicle, and discloses a matching method of low-temperature adaptive refrigeration oil and a refrigerant of a double-rotor compressor. Background When the ambient temperature of the automobile dual-rotor cold-hot overhead integrated machine is lower than-10 ℃, the viscosity of conventional refrigeration oil is obviously increased, so that the lubrication of a compressor is poor, the circulation quantity of a refrigerant is insufficient, and the heating capacity is greatly reduced. Existing solutions are mostly focused on replacing high pressure resistant compressors or employing a specific single refrigerant, which are costly and have poor system compatibility. With the stricter global environmental protection regulations, the refrigerant of the air conditioner for the vehicle has a diversified development trend. Besides the main stream refrigerants such as R32, R410A, R a, R1234yf and R290, the mixed refrigerant with low Global Warming Potential (GWP) such as R454B, R452B is used as an environment-friendly alternative scheme of R410A, and the mixed refrigerant is increasingly widely applied to the field of vehicle-mounted overhead integrated machines. Different refrigerants have obvious differences in physical parameters such as working pressure, intersolubility with the frozen oil, filling quantity sensitivity and the like, and the stable operation of the system at low temperature is challenged. Some improvements in refrigeration oils for specific refrigerants or specific low temperature compatibility are known in the art. For example, chinese patent publication No. CN107828460a discloses a refrigeration oil whose base oil is a polyol ester obtained by reacting a specific mixed fatty acid (valeric acid, heptanoic acid, caproic acid) with a polyol. The scheme aims to improve the compatibility of the refrigeration oil and the R410A or R32 refrigerant in the range of 0 ℃ to-15 ℃ and prevent layering, so that an auxiliary heating component is omitted. However, the technical solution is specifically directed to and limited to two refrigerants R410A and R32, and does not relate to and cannot solve the problem of adapting a plurality of refrigerants such as R134a, R1234yf, R290, R454B, R452B to a wider temperature range (for example, below-15 ℃), and the application range is limited. For another example, chinese patent publication No. CN105754682a provides a compressor refrigeration oil and refrigerant mixture for R161 refrigerant, which uses naphthenic mineral oil as base oil, and adds specific antioxidant and light absorber to maintain stability of R161 refrigerant at high temperature. The scheme is a typical 'one-oil one-medium' special proportioning thought, solves the stability problem of a specific refrigerant (R161), but cannot be completely adapted to other refrigerants with different physical properties, lacks versatility, and focuses on a temperature interval different from the low-temperature lubrication and circulation problem solved by the invention. In summary, the prior art focuses on the compatibility problem of adapting a single or a few refrigerants to a specific temperature range by improving the formulation of the refrigeration oil, which belongs to the point-to-point solution. However, in the face of the market current situation that the air conditioner coolant for vehicles is various and iterates rapidly, the scheme has obvious defects that 1) the adaptive range is narrow, a plurality of coolants from main flow to novel low GWP cannot be covered, the universality and market adaptability of products are limited, 2) the scheme is easy to avoid, competitors can bypass patent protection based on single coolant by simply replacing coolant types, 3) the problem of low-temperature performance is not solved systematically, and particularly, the physical property difference of different coolants is not combined, and the filling amount is finely adjusted to optimize the overall circulation performance and heating capacity of the low-temperature working condition below-15 ℃. Therefore, a low-cost generalized scheme is needed to be proposed, which can adapt to various refrigerants (including the existing mainstream model and novel environment-friendly substitutes), and solves the problems of lubrication guarantee and refrigeration and heating cycle efficiency of the dual-rotor compressor in a severe low-temperature environment by combining the selection of the refrigerating oil and the adjustment of the differential refrigerant filling quantity. Disclosure of Invention In order to solve the problems of narrow adaptation range, easy avoidance and insufficient low-temperature performance in the prior art, the invention provides a low-temperature adaptation refrigerating oil a