GB2596670A

GB2596670A - Method for producing lubrication composition and lubrication composition produced by same, and compressor and refrigeration system using same

Info

Publication number: GB2596670A
Application number: GB2113548.8A
Authority: GB
Inventors: Miyamoto Yoshiaki; Horaguchi Norihisa; Ishimoto Takao
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2019-03-25
Filing date: 2019-04-17
Publication date: 2022-01-05
Anticipated expiration: 2039-04-17
Also published as: JP6651664B1; JP2020158566A; DE112019007077T5; WO2020194762A1; GB2596670B; GB202113548D0

Abstract

The purpose of the present invention is to provide: a refrigerator oil (lubrication composition) that improves the wear resistance of an Oldham's link during a high oil temperature/low speed operation; and a method for producing the same. This method for producing a lubrication composition includes: a selection step in which a selection is made of a lubrication reagent, as an additive for improving lubrication characteristics, having a decomposition start temperature that is in a temperature range of 70-90°C, the decomposition start temperature being the temperature at which the change in thermogravity is 0.675-0.825%; and a blending step in which the selected lubrication reagent is blended, in the amount of 1-5 wt%, into a base oil.

Description

DESCR:PTION

Title of Invention

METHOD FOR PRODUCING LUBRICATION COMPOSITION, LUBRICATION COMPOSITION PRODUCED BY SAME, AND COMPRESSOR AND

REFRIGERATION SYSTEM USING SAME

Technical Field

[0001] The present invention relates to a method for producing a lubrication composition, a lubrication composition produced by the same, and a compressor and a refrigeration system using the same.

Background Art

[0002] A refrigeration device includes at least a compressor, a condenser, an expansion valve, and an evaporator. In the refrigeration device, components are connected to each other as a closed circuit by refrigerant pipes, and a structure is adopted in which a mixed liquid in which a refrigerant and a refrigeration oil are compatible circulates in a sealed system.

[0003] As part of global warming countermeasures, it has been essential to reduce the global warming potential (OWE) of refrigerants, and it has been a long time since the transition to hydrofluorocarbon (HFC) substitute refrigerants has been made. R410A, R32, and the like are known as HFC refrigerants. The GWP of R32 is approximately 1/3 of that of R410A.

[0004] It is assumed that HFC refrigerants are used under higher pressure than chlorofluorocarbon (CFC) refrigerants or hydrochlorofluorocarbon refrigerants (HCFC) that have been previously used. The pressure load is high in the compressor of the refrigeration device that uses HFC refrigerants.

[0005] The refrigeration oil is responsible for lubricating the compressor. As described in PIL 1, the refrigeration oil includes a base oil and a lubricant.

Citation List Patent Literature [0006] [PTL 1] Japanese Unexamined Patent Application Publication No. 2013-108033

Summary of Invention

Technical Problem [0007] One type of compressor is a scroll compressor -2 -including a fixed scroll and an orbiting scroll. The scroll compressor includes an Oldham link that allows the orbiting scroll to undergo a revolving motion while preventing the rotation of the orbiting scroll. The Oldham link slides back and forth along a groove as the orbiting scroll undergoes a revolving motion.

[0008] In the use of the HFC refrigerant in the refrigeration device at high load, reducing wear of the Oldham link during low speed operation is an issue. Particularly, an oil film is unlikely to be formed at low speed, and the state of lubrication is severe. In addition, the oil viscosity is low at high oil temperature, and the lubrication characteristics deteriorate, which is a problem.

[0009] The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a refrigeration oil (lubrication composition) and a method for producing the same capable of improving the wear resistance of an Oldham link from the current level during high oil temperature and low speed operation. Solution to Problem [0010] In order to solve the above problems, a method for -3 -producing a lubrication composition, a lubrication composition produced by the same, and a compressor and a refrigeration system using the same according to the present disclosure adopts the following means.

[0011] According to an aspect of the present disclosure, there is provided a method for producing a lubrication composition, the method including: a selection step of selecting a lubrication reagent having a decomposition start temperature in a temperature range of 702C to 902C, as an additive that Improves lubrication characteristics, when the decomposition start temperature is defined to be a temperature at which a change in thermal weight is from 0.675% to 0.825%; and a blending step of blending the selected lubrication reagent of an amount of 1% by weight to 5% by weight with a base oil.

[0012] The additive that improves the lubrication characteristics is decomposed by heat, and the weight of the additive changes (decreases). As a result of diligent studies, the inventors have defined a temperature at which the thermal weight decreases by 0.675% to 0.825%, preferably 0.7125% to 0.7875%, and more preferably 0.75% from an initial state, as the decomposition start temperature, and have selected the lubrication reagent -4 -based on the decomposition start temperature.

[0013] As a result of diligent studies, the inventors have found that evaluations may be performed under the condition that when a tribofilm is formed on an Oldham link, a change in thermal weight is approximately 0.75% ± 10%. The rate of the change in thermal weight is obtained from a thermogravimetric analysis graph. When the change in thermal weight is too small (for example, 0.3%), it is difficult to find the point of inflection. When the change in thermal weight is too large, there is a high probability that the lubrication reagent with which wear resistance is not improved is included in options.

[0014] According to the studies by the inventors, the oil temperature during high oil temperature and low speed operation in which wear was pronounced was from 702C to 90QC, and the temperature of a sliding portion of the Oldham link was higher than 902C. The lubrication reagent that starts to decompose in this temperature range (from 702C to 902C) can exhibit the function of an extreme-pressure agent or an anti-wear agent in the Oldham link during high oil temperature and low speed operation. When the decomposition start temperature is too low, a problem may occur in the chemical stability of the lubrication -5 -reagent such as oxidation stability. When the decomposition start temperature is too high, a tribofilm is unlikely to be formed on a surface of the Oldham link during low speed operation, and sufficient lubrication performance is not exhibited.

[0015] In one aspect of the disclosure, the selection step may include a step of selecting a high-temperature lubrication reagent having the decomposition start temperature in a temperature range exceeding 90QC from the additives that improve the lubrication characteristics. The blending step may include a step of blending the selected high-temperature lubrication reagent with the base oil.

[0016] The lubrication composition that can exhibit lubrication performance in a wide temperature range can be obtained by further blending the high-temperature lubrication reagent that starts to decompose (forms a tribofilm) at a higher temperature than the lubrication reagent.

[0017] According to an aspect of the present disclosure, there is provided a compressor to which the lubrication composition produced by the production method described in -6 -the above aspect is supplied, the compressor including: an Oldham link including a protruding key and made of iron or an aluminum alloy; and a member provided with a key groove into which the key is inserted, and made of the material different from a material of the Oldham link. The member is made of an aluminum alloy or iron.

[0018] Since the Oldham link and the key groove are made of different materials, adhesion caused by the same material during sliding can be prevented.

[0019] According to an aspect of the present disclosure, there is provided a refrigeration system including the compressor.

[0020] According to an aspect of the present disclosure, there is provided a lubrication composition including: a base oil; and a lubrication reagent which is selected from additives that improve lubrication characteristics and of which a change in thermal weight in a temperature range of 70QC to 902C is from 0.675% to 0.825%, in which 1% by weight to 5% by weight of the lubrication reagent is blended with the base oil.

Advantageous Effects of Invention [0021] -7 -The lubrication composition that improves wear resistance of the Oldham link during high oil temperature and low speed operation can be produced by selecting the lubrication reagent suitable for a usage environment, based on the decomposition start temperature, and blending the lubrication reagent. In the compressor to which the produced lubrication composition is supplied, the amount of wear in the Oldham link portion can be suppressed.

Brief Description of Drawings

[0022] Fig. 1 is a sectional view showing a scroll compressor according to a first embodiment.

Fig. 2 is a plan view showing an Oldham link and an upper bearing of Fig. 1.

Fig. 3 is a sectional view cut at the position of a key of the Oldham link of Fig. 2.

Fig. 4 is a block diagram of a refrigeration system. Fig. 5 is a thermogravimetric reagent A. Fig. 6 is a thermogravimetric reagent B. Fig. 7 is a thermogravimetric reagent C. Fig. 8 is a graph showing the relationship of wear depth with respect to a refrigerant and a refrigeration analysis graph of a analysis graph of a analysis graph of a -8 -oil.

Fig. 9 is a graph showing the relationship between the amount of TBP added and the wear depth.

Description of Embodiments

[0023] Hereinafter, one embodiment of a method for producing a lubrication composition, a lubrication composition produced by the same, and a compressor and a refrigeration system using the same according to the present disclosure will be described.

[First Embodiment] The method for producing a lubrication composition according to the present embodiment includes a selection step of selecting a lubrication reagent and a blending step of blending the selected lubrication reagent with a base oil.

[0024] (Selection Step) In the selection step, a lubrication reagent having a decomposition start temperature in a temperature range of 70QC to 90QC is selected as an additive for a refrigeration oil which improves the lubrication characteristics.

[0025] The decomposition start temperature is a temperature -9 -at which the weight of the lubrication reagent begins to change (decrease) due to heat. The decomposition start temperature of the lubrication reagent can be obtained by thermogravimetric analysis. In the thermogravimetric analysis, the temperature of reactions such as oxidation and decomposition is specified by changing the temperature of a sample and a reference substance in the same manner and measuring the electrical energy required for the change. The thermogravimetric analysis can be Performed by a differential thermal analyzer (DTA). When the decomposition start temperature of the reagent is published in a catalog or the like, the decomposition start temperature may be used.

[0026] In the present embodiment, a temperature at which the amount of change (decrease) in weight of the lubrication reagent from an initial state is from 0.675% to 0.825%, preferably 0.7125% to 0.7875%, and more preferably 0.75% is defined as the "decomposition start temperature".

[0027] (Blending Step) In the blending step, the lubrication reagent of an amount of 1 wt% to 5 wt% and preferably 1 wt% to 3 wt% is blended with the base oil. A blend of the lubrication -10 -reagent and the base oil is a lubricant composition (refrigeration oil).

[0028] The base oil may be a polyol ester (POE), polyvinyl ether (PVE), polyalkylene glycol (PAG), mineral oil, or the like. The base oil may have an ester bond in the molecular structure.

[0029] In the blending step, an additive and the like that improve thermal stability may be further blended.

[0030] (Application to Compressor) The lubrication composition produced according to the embodiment is suitable for use in a scroll compressor including an Oldham link.

[0031] The material of the Oldham link may be iron or an aluminum alloy.

[0032] Fig. 1 is a sectional view of the scroll compressor to which the lubrication composition can be supplied.

A scroll compressor (scroll fluid machine) 1 is provided in a refrigerant circuit (refrigeration system) of an air conditioning device, and compresses a gaseous refrigerant, which is supplied from an evaporator, to supply the gaseous refrigerant of high pressure to a condenser. As shown in Fig. 1, the scroll compressor 1 includes a fixed scroll 3 and an orbiting scroll 4, which revolves with respect to the fixed scroll 3, in a housing 2.

[0033] The fixed scroll 3 is fixed to the housing 2 via an upper bearing 21, and includes a wall body 33 having a scroll shape erected on an end plate 31. The orbiting scroll 4 includes a wall body 43 having a scroll shape erected on an end plate 41. The wall body 33 of the fixed scroll 3 and the wall body 43 of the orbiting scroll 4 have substantially the same shape. The orbiting scroll 4 is rotated by 180Q with respect to the fixed scroll 3 to cause the wall bodies 33 and 43 to mesh with each other, so that a plurality of sealed compression spaces R1 are formed.

[0034] The orbiting scroll 4 undergoes a revolving motion with respect to the fixed scroll 3 in a state where the rotation of the orbiting scroll 4 is restricted by an Oldham link 23.

[0035] The orbiting scroll 4 is rotated by a motor 6 that drives the orbiting scroll 4. A rotating shaft 5 to be -12 -rotated by the motor 6 is connected to the orbiting scroll 4 via a crank pin 27. The crank pin 27 is eccentrically provided with respect to a central axis of the rotating shaft 5. The crank pin 27 is rotatably connected to a boss formed on a back surface (lower surface in the drawing) of the end plate 41 of the orbiting scroll 4 via a drive bush and a drive bearing 52. The rotating shaft 5 is rotatably supported by the upper bearing 21 and a lower bearing 24 fixed to the housing 2.

[0036] A storage region 26 that stores the lubrication composition (lubricant 0) is provided in a lower portion of the housing 2. The lubricant 0 is pumped through an oil supply path 53 inside the rotating shaft 5 by a pump 54 provided at a lower end of the rotating shaft 3, and is provided to sliding portions of the lower bearing 24, the upper bearing 21, the drive bearing 52 provided around the crank pin 27, the orbiting scroll 4, the Oldham link 23, and the like.

[0037] The housing 2 is provided with a suction pipe 28 that suctions the gaseous refrigerant of low pressure, and a discharge pipe 29 that discharges the compressed gaseous refrigerant of high pressure. The suction pipe 28 and the discharge pipe 29 are connected to the refrigeranr_ circuit -13 -of the air conditioner not shown.

[0038] The scroll compressor 1 described above operates as follows.

When a driving current is supplied to a stator 61 of the motor 6 from a power supply not shown, a rotor 62 of the motor 6 rotates, and driving force is output to the rotating shaft 5.

When the rotating shaft 5 rotates, driving force is transmitted to the orbiting scroll 4 via the crank pin 27 provided at an upper end of the rotating shaft 5 to be eccentric from the central axis of the rotating shaft 5 to one outward direction (eccentric direction) in a radial direction. Accordingly, the orbiting scroll 4 revolves with respect to the fixed scroll 3 while being prevented from rotating due to action of the Oldham link 23.

[0039] The refrigerant that has flowed in from the suction pipe 28 is suctioned between the orbiting scroll 4 and the fixed scroll 3 by the orbiting of the orbiting scroll 4. Then, as the orbiting scroll 4 orbits, the volume of the compression spaces R1 between the orbiting scroll 4 and the fixed scroll 3 decreases, so that the refrigerant in the compression spaces R1 is compressed.

[0040] -14 -The compressed refrigerant is discharged to the refrigerant circuit by the discharge pipe 29 through a discharge port 32 of the fixed scroll 3 and a discharge port 38 of a discharge cover 37. A multiport 32A is formed in the fixed scroll 3, and the multiport 32A is provided with a reed valve 36 attached to the end plate 31 of the fixed scroll 3 via a retainer 35. The discharge port 38 of the discharge cover 37 is also provided with a reed valve 37B attached to the discharge cover 37 via a retainer 37A. When the pressure of the compressed refrigerant reaches a predetermined value, the refrigerant that pushes and opens the reed valves 36 and 373 is discharged to a condenser side of the refrigerant circuit.

[0041] Figs. 2 and 3 show the Oldham link 23 shown in Fig. 1. The Oldham link 23 is provided on the upper bearing 21. As shown in Fig. 1, the Oldham link 23 is provided on a back surface side of the end plate 41 of the orbiting scroll 4.

[0042] As shown in Fig. 2, the Oldham link 23 has a substantially annular shape in the case of a plan view. In the case of a plan view as shown in Fig. 2, keys 23A protruding downward (upper bearing 21 side) are provided on both right and left sides, namely, at the positions of -15 - 3 o'clock and 9 o'clock. In the case of a plan view as shown in Fig. 2, keys 233 protruding upward (orbiting scroll 4 side) are provided on both upper and lower sides, namely, at the positions of 6 o'clock and 12 o'clock. Namely, a direction in which two keys 23A are provided and a direction in which two keys 233 are provided are provided to be orthogonal to each other. As shown in Fig. 3, each of the keys 23A protruding downward is inserted into a key groove 21A formed in the upper bearing 21. Each of the keys 233 protruding upward is, although not shown, inserted into a key groove formed in the end plate 41 of the orbiting scroll 4.

[0043] The upper bearing 21 and the orbiting scroll 4 may be made of a material different from that of the Oldham link 23. When the material of the Oldham link 23 is iron, the material of the key grooves formed in the upper bearing 21 and the orbiting scroll 4 may be aluminum. When the material of the Oldham link 23 is aluminum, the material of the key grooves formed in the upper bearing 21 and the orbiting scroll 4 may be iron.

[0044] Fig. 4 is a block diagram of the refrigeration system including the scroll compressor 1. As shown in Fig. 4, for example, the refrigeration system includes the -16 -scroll compressor 1, a condenser 12, an expansion valve 13, and an evaporator 14. These components are connected to each other via pipes 15a to 15d that allow the flow of the refrigerant to transfer the refrigerant.

[0045] In the refrigeration system, the condenser 12 condenses and liquefies the refrigerant gas of high temperature and high pressure to dissipate heat, the expansion valve 13 adiabatically expands the liquid refrigerant of high temperature and high pressure, which has passed through the condenser 12, to reduce the pressure, the evaporator 14 evaporates and vaporizes the liquid refrigerant of low temperature and low -pressure, which has passed through the expansion valve 13, 7.0 absorb heat, and the scroll compressor 1 adiabatically compresses the refrigerant gas of low temperature and low pressure which has passed through the evaporator 14. The refrigerant gas of high temperature and high pressure which has passed through the scroll compressor 1 is supplied to the condenser 12. The movement of heat from the evaporator 14 to the condenser 12 can be realized and interior air conditioning (heating and cooling) is feasible by circulating the refrigerant as a heat transfer medium in the closed system in such a manner.

[0046] -17 -The lubrication composition supplied to the scroll compressor 1 circulates through the refrigeration system including the evaporator 14, the expansion valve 13, and the condenser in a state where the lubrication composition is mixed with the refrigerant, and returns to the compressor. The lubrication composition in the refrigeration system is used almost without being replaced for the duration of use of the refrigeration system in a state where the lubrication composition is sealed, together with the refrigerant, in the system.

[0047] In the actual machine environment, the temperature of the lubrication composition in the vicinity of the Oldham link 23 during high oil temperature and low speed operation is 802C ± 102C. The lubrication reagent having a decomposition start temperature in a temperature range of 702C to 902C forms a low shear tribofilm on a sliding surface of the Oldham link during low speed operation to lower the friction coefficient of the sliding portion. As a result, the lubrication reagent having a decomposition start temperature in a temperature range of 70QC to 902C has the effect of reducing the amount of wear.

[0048] [Second Embodiment] In the present embodiment, the selection step may -18 -further include a step of selecting a high-temperature lubrication reagent. The blending step may further include a step of blending the selected high-temperature lubrication reagent with the base oil.

[0049] As the high-temperature lubrication reagent, one or a plurality of additives having a decomposition start temperature in a temperature range exceeding 90QC are selected from additives functioning as extreme-pressure agents or lubricants.

[0050] The high-temperature lubrication reagent of an amount of 0.1 wt% to 5 wt% and preferably 0.1 wt% to 3 wt% is blended with the base oil.

[0051] [Test] (Selection of Lubrication Reagent) The decomposition start temperatures of the following reagents A to C were obtained by thermograv±metric analysis.

[0052] A: Triphenylphosphate (TPP) B: Ethyl diethylphosphonoacetate (JC-224) C: Tributyl phosphate (TBP) [0053] -19 -The results are shown in Figs. 5 to 7 and Table 1. [0054] Fig. 5 is a graph showing a change in thermal weight of the reagent A (TPP). Fig. 6 is a graph showing a change in thermal weight of the reagent B (JC-224). Fig. 7 is a graph showing a change in thermal weight of the reagent C (TBP). In Figs. 5 to 7, the horizontal axis is time (minutes), the left vertical axis is a change in thermal weight (%), and the right vertical axis is temperature (QC).

[0055] In Table 1, the temperatures when a change in thermal weight was 0.75% were read from Figs. 5, 6 and 7, and were described as the decomposition start temperatures.

[0056]

[Table 1]

Reagent_ pecumP°51Liun Decomposition Acid Value MelLing Poinli Start RemperaLur-e (mmK OH/g) or Solidifying Point (QC) 7emperature (QC) (QC) A 190 300 0.03 or less 47 53 H°.

E 165 225 0.03 or less liquid A 80 210 0.07 or less liquid [0057] According to Table 1, the reagents A, B, and C had low acid values. A change between the decomposition temperatures of the reagents B and C was only several -20 -degrees C, but a difference in decomposition start temperature was approximately 852C.

[0058] (Wear Resistance) Wear resistance was evaluated by sliding a fixed piece and a rotating piece according to JIS K7218 using a ring-on-disk refrigerant atmosphere friction test device.

[0059] The material of the fixed piece was ADC12, which is an Al-Si-Cu alloy, and the surface was coated with hard alumite. For the rotating piece, a material made of flake graphite cast iron (FC200) was used.

[0060] In the actual machine, wear of the Oldham link is observed at high oil temperature and low speed. Test conditions were set according to operating conditions of the actual machine.

[0061] Table 2 shows the test conditions.

-21 -

[Table 2]

Item Test I Test 2 Test 3 Refrigerant R410A*1 R32-2 Lubrication POE Oil #1 POE Oil #2 Environment Oil Bath Oil Bath Additive TBP JC-224 0 to 5 wt% 5 wt% Load 950 N Rotation Speed 2000 rpm Test Time 4.5 hr Test Start Oil Temperature 88°C Pressure 1.05 MPaG *1: refrigerant in which R32 and R125 (pentafluoroethane) are mixed at equal amounts *2: difluoromethane [0062] Results are shown in Figs. 8 and 9. Fig. 8 is a graph showing the relationship of wear depth with respect to the refrigerant and the refrigeration oil. Fig. 9 is a graph showing the relationship between the amount of the TBP added and the wear depth of the fixed piece in Test 3. In the graph, the horizontal axis is the amount of the TBP added (wt%), and the vertical axis is the wear depth (pm) of the fixed piece.

[0063] According to Fig. 8, the wear depth of the TBP (1 wt% and 5 wt% added) in Test 2 was approximately 3 pm, and the amount of wear was the lowest as compared to those in -22 -Tests 1 and 3. Regarding the amount of wear in Test 3 in which the JC-224 was added, the amount of wear was lower than that in Test 2 in which the TBP was not added, but the amount of wear was larger than that in Test 1 in which the R410A refrigerant was used.

[0064] According to Fig. 9, in Test 2 in which the TBP was added, when the amount of the TBP added was set to 1% or more, the effect of =prong the wear resistance was observed. In a test in which 1 wt% to 5 wt% of the TBP was added, the wear depth of the fixed piece was from approximately 2.5 pm to 3.2 pm. Meanwhile, in tests in which 0.75 wt% and 0.25 wt% of the TBP were added, the wear depths of the fixed pieces were 20 pm and 19 pm, respectively. From the above results, it was confirmed that the wear resistance was remarkably Improved by adding 1 wt% or more of the TB?.

Incidentally, according to Fig. 8, in Test 3 in which the JC-224 was added, the wear depth of the fixed piece was 55 pm. In Test 1 in which the R410A refrigerant was used and no additive was added, the wear depth of the fixed piece was 43 pm, and the effect of improving the wear resistance with an oil in which 5 wt% of the JC-224 was added was not observed.

[0065] -23 -Both the 30-224 and the TBP are phosphorus compounds, but both have different decomposition start temperatures. The decomposition start temperature of the TBP is equal to or lower than a test start oil temperature of this test. For this reason, it is expected that during the test, the TBP is decomposed to form a fribofilm, and meanwhile, the 30-224 having a decomposition start temperature higher by approximately 852C than the test start oil temperature of this test does not form a tribofilm.

[0066] Incidentally, in the embodiments, the Oldham link has been described, and the same effect can also be expected in a blade sliding portion of a rotary compressor. Reference Signs List [0067] 1: Scroll compressor (scroll fluid machine) 2: Housing 3: Fixed scroll 4: Orbiting scroll 12: Condenser 13: Expansion valve 14: Evaporator 15a to 15d: Pipe 21: Upper bearing 21A: Key groove -24 - 23: Oldham link 23A: Key 23B: Key 24: Lower bearing 26: Storage region 27: Crank pin 28: Suction pipe 29: Discharge pipe 31: End plate 32, 38: Discharge port 32A: Multiport 33: Wall body 35: Retainer 36: Reed valve 37: Discharge cover 37A: Retainer 373: Reed valve 41: End plate 43: Wall body 52: Drive bearing R1: Compression space -25 -

Claims

Claims [Claim 1] A method for producing a lubrication composition, the method comprising: a selection step of selecting a lubrication reagent having a decomposition start temperature in a temperature range of 702C to 902C, as an additive that improves lubrication characteristics, when the decomposition start temperature is defined to be a temperature at which a change in thermal weight is from 0.675% to 0.825%; and a blending step of blending the selected lubrication reagent of an amount of 1% by weight to 5% by weight with a base oil.[Claim 2] The method for producing a lubrication composition according to claim 1, wherein the selection step includes a step of selecting a high-temperature lubrication reagent having the decomposition start temperature in a temperature range exceeding 902C from the additives that improve the lubrication characteristics, and the blending step includes a step of blending the selected high-temperature lubrication reagent with the -26 -base oil.[Claim 3] A compressor to which the lubrication composition produced by the production method according to claim 1 or 2 is supplied, the compressor comprising: an Oldham link including a protruding key and made of iron or an aluminum alloy; and a member provided with a key groove into which the key is inserted, and made of a material different from a material of the Oldham link, wherein the member is made of an aluminum alloy or iron.[Claim 4] A refrigeration system comprising: the compressor according to claim 3.[Claim 5] A lubrication composition comprising: a base oil; and a lubrication reagent which is selected from additives that improve lubrication characteristics and of which a change in thermal weight in a temperature range of 702C to 902C is from 0.675% to 0.825%, -27 -wherein 1% by weight to 5% by weight of the lubrication reagent is blended with the base oil.-28 -