2016/9/16
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`Patent & Utility Model Number Search(Detail) [J-PlatPat
`
`(11)Publication number
`
`2004-125199
`
`(43)Date of publication of application
`
`22.04.2004
`
`(51)Int.Cl.
`
`(21)App|ication number
`
`(22)Date of filing
`
`(71)Applicant
`
`(72)Inventor
`
`F258
`
`1/10
`
`F258
`
`1/00
`
`2002—286112
`
`30.09.2002
`
`SANYO ELECTRIC CO LTD
`SANYO ELECTRIC BIOMEDICAL CO LTD
`
`YOSHIDA FUKUJI
`INOUE KATSUHIKO
`
`SUDO MINORU
`
`YUZAWA JIRO
`
`TAKASUGI KATSUJI
`
`TOBE RYUZO
`
`(54) REFRIGERANT CIRCUIT
`
`(57)Abstract
`
`PROBLEM TO BE SOLVED: To provide a highly reliable refrigerant circuit causing no blocking
`
`up, damaging and breaking of the refrigerant circuit used for a refrigerating plant for obtaining
`
`a cooling temperature of an extremely low temperature of ~ 70 °C or less without causing risk
`
`of breaking an ozone layer.
`
`SOLUTION: This refrigerant circuit successively connects a compressor, a radiator, a
`
`decompressor and a cooler, and is constituted so as to seal a refrigerant inside. This refrigerant
`
`circuit is provided with a motor—driven element, a low stage compression element and a high
`
`stage compression element driven by this motor—driven element as the compressor. This
`
`refrigerant circuit uses a two—stage compression type compressor for supplying, further
`
`compressing and delivering the refrigerant compressed by the low stage compression element
`
`to the suction side of the high stage compression element. The refrigerant including no chlorine
`
`group and having a boiling point of — 80 °C or less is sealed as the refrigerant.
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`https://www4.j-platpat.inpit.go.jpleng/tokujitsu/tkbs_erVTKBS_EN_GM BOLDetailedacti on
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`2016/9/16
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`Patent & Utility Model Number Search(Detail) [J—PlatPat
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`CLAIMS
`
`[Claim(s)]
`
`[Claim 1]
`
`In a refrigerant circuit where a refrigerant is enclosed with an inside while connecting a compressor, a
`
`radiator, a pressure reducing device, and a condensator sequentially,
`
`A refrigerant circuit which is provided with the following, supplies a refrigerant compressed with the
`
`aforementioned low stage compression element to an inlet side of the aforementioned high rank
`
`compression element, uses a two—step compression equation compressor which is further compressed
`
`and is discharged, and is characterized by the boiling point enclosing a refrigerant not more than -80
`
`degree C as the aforementioned refrigerant excluding a chlorine group.
`
`As the aforementioned compressor, it is a motor element.
`
`A low stage compression element and a high rank compression element which are driven with this
`motor element.
`
`[Claim 2]
`
`The refrigerant circuit according to claim 1, wherein the aforementioned refrigerants are at least 1
`
`type of refrigerants chosen from a mixture of trifluoromethane, trifluoromethane, and
`
`hexafluoroethane, N20, and ethane.
`
`[Claim 3]
`
`The refrigerant circuit according to claim 2, wherein the aforementioned refrigerant contains at least 1
`
`type of refrigerants further chosen from tetrafluoromethane, methane, and ethane.
`
`[Claim 4]
`
`The refrigerant circuit according to any one of claims 1 to 3, wherein the aforementioned refrigerant
`
`contains at least 1 type of hydrocarbon chosen from various hydrocarbon suitable as an oil returning
`
`agent.
`
`[Claim 5]
`
`The refrigerant circuit according to claim 4, wherein the aforementioned oil is at least 1 type of oil
`
`chosen from straight mineral oil and alkylbenzene oil.
`
`[Claim 6]
`
`The refrigerant circuit according to any one of claims 1 to 5 providing an oil separator which separates
`
`oil in a refrigerant compressed with the aforementioned high rank compression element, and supplies
`
`separated oil to a refrigerant return end of the aforementioned two-step compression equation
`compressor.
`
`[Claim 7]
`
`While separating into gas-liquid a refrigerant compressed with the aforementioned low stage
`
`compression element and supplying a separated vapor phase component to an inlet side of the
`
`aforementioned high rank compression element, A heat exchange apparatus for heat-exchanging with
`
`a refrigerant which supplied a liquid phase component and was compressed with the aforementioned
`
`high rank compression element, and making it evaporate substantially is installed in a line of a
`
`discharge side of the aforementioned high rank compression element, The refrigerant circuit according
`
`to any one of claims 1 to 6 supplying a liquid phase component made to evaporate with the
`
`aforementioned heat exchange apparatus to a refrigerant return end of the aforementioned two-step
`
`compression equation compressor.
`
`[Claim 8]
`
`Separate into gas—liquid a refrigerant compressed with the aforementioned high rank compression
`
`element, supply a separated vapor phase component to a condensator, and it generates cold energy,
`
`The refrigerant circuit according to any one of claims 1 to 6 making a liquid phase component which
`
`separated [ aforementioned ] from the aforementioned vapor phase component after generating cold
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`energy join, and supplying a refrigerant return end of the aforementioned two-step compression
`
`equation compressor.
`
`[Claim 9]
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`The refrigerant circuit according to any one of claims 1 to 8 using a capillary tube for pressure control
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`of a refrigerant.
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`DETAILED DESCRIPTION
`
`[Detailed Description of the Invention]
`
`[0001]
`
`[Field of the Invention]
`
`The present invention relates to the refrigerant circuit which it relates to a refrigerant circuit, and
`
`there is no risk of destroying the ozone layer used for a freezer in more detail, and can obtain the
`
`cooling temperature of ultra low temperature of -70 degrees C or less.
`
`[0002]
`
`[Description of the Prior Art]
`
`It is the dichlorodifluoromethane which is conventionally used as a refrigerant of a freezer.
`
`(Hereinafter, it is called R12) R500 which consists of R12 of an azeotropic refrigerant and 1 and 1-
`
`difluoroethane (henceforth R152a) is used, and the boiling point of R12 is -29.65 degree C in
`
`atmospheric pressure, The boiling point of R500 is -33.45 degree C, and is suitable to the usual
`
`freezer before and behind cooling temperature-18 degree C. R12 had good compatibility with oil
`
`(refrigerating machine oil), such as straight-minerai-oil system oil of a compressor, and alkylbenzene
`
`system oil, and the role which pulls back the oil in a refrigerant circuit to a compressor was also
`
`performing.
`
`[0003]
`
`However, if these refrigerants are emitted by the latency of that high ozone crack into the atmosphere
`
`and arrive at the ozone layer over the earth, they will destroy this ozone layer. Depletion of this ozone
`
`layer is caused by the chlorine group (Cl) in a refrigerant. Then, for example, this chlorine group is
`
`not included, C02 refrigerant is used, C02 refrigerant compressed with the low stage compression
`
`element is supplied to the inlet side of a high rank compression element, and the two~step
`
`compression equation compressor which is further compressed and is discharged is proposed (for
`
`example, see Patent Document 1).
`
`[0004]
`
`[Patent document 1]
`
`JP,2001~82368,A
`
`[0005]
`
`[Problem to be solved by the invention]
`
`In order to stop chemical and the physical change of biological materials, such as a stock cell, DNA,
`
`blood, and marrow cells, and to save over a long period of time generally, The growth rate of an ice
`
`crystal declines remarkably and it is called necessity that enzyme activity puts on the temperature
`
`zone not more than abbreviation—80 degree C said to stop completely, In order to carry out a
`
`mothball without not building an ice crystal, but glassiness—izing a cell and recrystallizing it, it is called
`
`necessity to put on the temperature zone not more than abbreviation-135 degree C.
`
`If it is about —50 degrees C or more in cooling temperature, it will be satisfactory in the conventional
`
`refrigerant circuit provided with the two-step compression equation compressor using C02 refrigerant,
`
`but when the cooling temperature of ultra low temperature of -70 degrees C or less is required,
`
`C02 refrigerant solidifies, and there is a possibility of a refrigerant circuit being blockaded, and it being
`damaged and destroying.
`
`Although there is a 2 yuan refrigeration system which connects the refrigerant circuit where cooling
`
`temperature is comparatively high, and the refrigerant circuit where low-temperature cooling
`
`temperature is obtained, and obtains the cooling temperature at -70 degrees C or less, the number of
`
`parts of a frozen system of 2 yuan increases, equipment becomes large—sized, and there is a problem
`
`that power consumption becomes cost increase largely.
`
`[0006]
`
`The present invention is a refrigerant circuit which the above~mentioned problem is solved, and there
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`https:/Mww4.j-platpat.inplt.go.j p/cgi~bin/tran_web_cgi__ejje?u= http:/vaw4.j—platpatinpit.go.j pleng/translatlon/20160916114721 9964667391 6929619021 086. ..
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`is no risk of destroying an ozone layer used for a freezer, and can obtain cooling temperature of ultra
`
`low temperature of ~70 degrees C or less.
`
`The purpose is to provide a refrigerant circuit where reliability which is not damaged [ which is not
`
`damaged and does not blockade a refrigerant circuit ] and is not destroyed is high.
`
`[0007]
`
`[Means for solving problem]
`
`The refrigerant circuit of Claim 1 of the present invention for solving the above-mentioned problem,
`
`In the refrigerant circuit where a refrigerant is enclosed with an inside while connecting a compressor,
`
`a radiator, a pressure reducing device, and a condensator sequentially, As the aforementioned
`
`compressor, it has a motor element, and the low stage compression element and high rank
`
`compression element which are driven with this motor element, The refrigerant compressed with the
`
`aforementioned low stage compression element was supplied to the inlet side of the aforementioned
`
`high rank compression element, the two-step compression equation compressor which is further
`
`compressed and is discharged was used, and the boiling point enclosed the refrigerant not more than
`
`-80 degree C as the aforementioned refrigerant excluding the chlorine group.
`
`[0008]
`
`The boiling point using the refrigerant not more than -80 degree C excluding a chlorine group by the
`
`refrigerant circuit which uses as a compressor the two—step compression equation compressor which
`
`supplies the refrigerant compressed with the low stage compression element to the inlet side of the
`
`aforementioned high rank compression element, further compresses it, and discharges it as a
`
`refrigerant, There is no risk of destroying the ozone layer used for a freezer, and it can obtain the
`
`cooling temperature not more than about abbreviation-18 degree-C——70 degree C, The refrigerant
`
`circuit where the reliability which is not damaged [ which is not damaged and does not blockade a
`
`refrigerant circuit ] and is not destroyed is high can be provided, and since chemical and the physical
`
`change of biological materials, such as a stock cell, DNA, blood, and marrow cells, are stopped and it
`
`saves over a long period of time, it can be used.
`
`[0009]
`
`The refrigerant circuits of Claim 2 of the present invention are at least 1 type of refrigerants in which
`
`the aforementioned refrigerant is chosen from the mixture of trifluoromethane, trifluoromethane, and
`
`hexafluoroethane, N20, and ethane in the refrigerant circuit according to claim 1.
`
`[0010]
`
`Mixture [R—508A of trifluoromethane (R—23, boiling point-82.4 degree C), trifluoromethane, and
`
`hexafluoroethane, R-23 (39 mass o/o) / hexafluoroethane (R-116) (61 mass 0/0), Boiling point : -85.7
`
`degree C, R-508i3, R—23 (46 mass %) / R—116 (54 mass O/o), Boiling point: It is chemically [ the
`
`boiling points, such as —86.9 degree-C], N20 (R—744A, boiling point:-88.5 degree C), and ethane
`
`(boiling point: —89 degree C), ] and physically stable, and the refrigerant not more than ~80 degree C
`
`is excellent in a handling property, and also easy to receive.
`
`[0011]
`
`The refrigerant circuit of Claim 3 of the present invention contains at least 1 type of refrigerants in
`
`which the aforementioned refrigerant is further chosen from tetrafluoromethane, methane, and
`
`ethane in the refrigerant circuit according to claim 2.
`
`[0012]
`
`Tetrafluoromethane (R—14, boiling point-128 degree C), methane (R—SO, boiling point-162 degree
`
`C), It is chemically [ ethane ] and physically stable, and it excels in a handling property, and also
`
`acquisition is also easy, and it can obtain low—temperature cooling temperature further by blending at
`
`least 1 type of refrigerants further chosen as the aforementioned refrigerant from these.
`
`[0013]
`
`The refrigerant circuit of Ciaim 4 of the present invention contains at least 1 type of hydrocarbon in
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`which the aforementioned refrigerant is chosen from various hydrocarbon suitable as an oil returning
`
`agent in the refrigerant circuit according to any one of claims 1 to 3.
`
`[0014]
`
`Ethane, propane (R—290, boiling point—42.8 degree C), n—butane (R—600, boiling point:-5.6 degree
`
`C), Compatibility with oil is improved by blending with the aforementioned refrigerant by making into
`
`an oil returning agent at least 1 type of hydrocarbon chosen from various hydrocarbon, such as iso—
`
`butane (R—600a, boiling point—11.7 degree C) and n—pentane (boiling point: 36.1 degrees C), Since
`
`the oil discharged from the compressor can be returned to a compressor, even if it uses oil, such as
`
`alkylbenzene oii, such as straight mineral oil with bad compatibility with a refrigerant, and a HAB oil
`
`(hard alkylbenzene oil), There are no problems, such as becoming a lubrication defect of a
`
`compressor from aggravation of the return of the oil to a compressor, sucking of the separation
`
`refrigerant at the time of falling-asleep starting, etc.
`
`[0015]
`
`The refrigerant circuits of Claim 5 of the present invention are at least 1 type of oil as which the
`
`aforementioned oil is chosen from straight mineral oil and alkylbenzene oil in the refrigerant circuit
`
`according to claim 4.
`
`[0016]
`
`It is chemically and physically stable, and since it excels in a lubrication characteristic, it is oil used as
`
`refrigerating machine oil of a refrigerant circuit from the former, and straight mineral oil and
`
`alkylbenzene oil are excellent in a handling property, and inexpensive.
`
`[0017]
`
`The refrigerant circuit of Claim 6 of the present invention provided the oil separator which separates
`
`the oil in the refrigerant compressed with the aforementioned high rank compression element, and
`
`supplies the separated oil to the refrigerant return end of the aforementioned two-step compression
`
`equation compressor in the refrigerant circuit according to any one of claims 1 to 5.
`
`[0018]
`
`Whether it uses an oil returning agent or does not use it, the oil discharged from the compressor can
`
`be more reliably returned to a compressor by providing an oil separator.
`
`[0019]
`
`While separating into gas—liquid the refrigerant compressed with the aforementioned low stage
`
`compression element and supplying the separated vapor phase component to the inlet side of the
`
`aforementioned high rank compression element in the refrigerant circuit according to any one of
`
`claims 1 to 6, the refrigerant circuit of Claim 7 of the present invention, The heat exchange apparatus
`
`for heat-exchanging with the refrigerant which supplied the liquid phase component and was
`
`compressed with the aforementioned high rank compression element, and making it evaporate
`
`substantially is installed in the line of the discharge side of the aforementioned high rank compression
`element, and the liquid phase component made to evaporate with the aforementioned heat exchange
`
`apparatus is supplied to the refrigerant return end of the aforementioned two—step compression
`
`equation compressor.
`
`[0020]
`
`By separating into gas—liquid the refrigerant compressed with the low stage compression element, and
`
`supplying the separated vapor phase component to the inlet side of a high rank compression element,
`
`Damage to the compressor by a liquid phase component being supplied to a high rank compression
`
`element, destruction, etc. can be prevented, By ****** which heat—exchanges with the refrigerant
`
`which supplied liquid phase components, such as a separated oil returning agent, to the heat
`
`exchange apparatus, and was compressed with the high rank compression element, makes evaporate
`
`substantially, and it supplies to the refrigerant return end of a two—step compression equation
`
`compressor, While being able to prevent damage to a compressor, destruction, etc., since only the
`
`aforementioned vapor phase component is supplied to the condensator of a refrigerant circuit, low
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`cooling temperature can be obtained more.
`
`[0021]
`
`In the refrigerant circuit according to any one of claims 1 to 6 the refrigerant circuit of Claim 8 of the
`
`present invention, The refrigerant compressed with the aforementioned high rank compression
`
`element is separated into gas-liquid, the separated vapor phase component is supplied to a
`
`condensator, the liquid phase component which separated [ aforementioned ] from the
`
`aforementioned vapor phase component after generating cold energy and generating cold energy is
`
`made to join, and the refrigerant return end of the aforementioned two—step compression equation
`
`compressor is supplied.
`
`[0022]
`
`Low cooling temperature can be obtained more by separating into gas~liquid the refrigerant
`
`compressed with the high rank compression element, and supplying the separated vapor phase
`
`component to a condensator.
`
`[0023]
`
`In the refrigerant circuit according to any one of claims 1 to 8, the capillary tube was used for the
`
`refrigerant circuit of Claim 9 of the present invention for the pressure control of a refrigerant.
`
`[0024]
`
`A capillary tube is simple for structure and it is inexpensive.
`
`[0025]
`
`[Mode for carrying out the invention]
`Hereinafter, the present invention is described in detail using Drawings.
`(First embodiment of the present invention)
`
`Fig.1 is an explanatory view showing one working example of the refrigerant circuit of the present
`invention.
`
`Fig.2 is an explanatory view showing the longitudinal cross section of the rotary compressor which is
`
`one working example of the two-step compression equation compressor used by the present
`invention.
`
`The form in particular of the two-step compression equation compressor used by the present
`
`invention is not limited, but, specifically, can illustrate a rotary compressor, a reciprocating type
`
`compressor, an oscillating type compressor, a multi-vane type rotary compressor, a scroll type
`
`compressor, etc. Hereinafter, it describes about the case of the two-step compression equation rotary
`
`compressor shown in Fig.2.
`
`[0026]
`
`As shown in Fig.2, the rotary compressor (rotary system compressor) 1 of a two-step compression
`
`equation consists of the motor element 3 provided by the upper part in the well-closed container 2
`
`which consists of metal, such as iron, and the compression element 5 which this motor element 3 is
`
`provided caudad and rotated with the axis of rotation 4 of the motor element 3. The aforementioned
`
`well-closed container 2 makes the lower part an oil sump, and the terminal terminal (wiring is
`
`omitted) 6 for supplying electric power to the motor element 3 is attached to the upper part.
`
`The compression element 5 of the two—step compression equation rotary compressor 1 is provided
`
`with the low stage compression element 7 and the high rank compression element 8, The refrigerant
`
`sucked and compressed from the inlet side (refrigerant return end) 9 of the low stage compression
`
`element 7 (excluding a chlorine group) After the boiling point discharges the refrigerant not more
`
`than —80 degree C from the discharge side 10 of the low stage compression element 7, the inlet side
`
`11 of the high rank compression element 8 is supplied through the radiator etc. which are not
`
`illustrated, and it further compresses, and discharges from the discharge side 12.
`
`[0027]
`
`As shown in Fig.1, the refrigerant sucked and compressed from the inlet side 9 of the low stage
`
`compression element 7 of the two-step compression equation rotary compressor 1 of the refrigerant
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`circuit A of the present invention is discharged from the discharge side 10 of the low stage
`
`compression element 7, After being cooled by the degree which a refrigerant does not liquefy through
`
`the radiator 13, the inlet side 11 of the high rank compression element 8 is supplied, and it is further
`
`compressed into high voltage, and discharges from the discharge side 12, The oil in a refrigerant is
`
`separated by the oil separator 14, and the separated oil is supplied to the inlet side 9 (refrigerant
`
`return end) of the low stage compression element 7. If it is cooled with the radiator 15, and pressure
`
`control of the refrigerant which passed through the oil separator 14 was carried out, and after
`
`adiabatic expansion is carried out by the capillary tube (or expansion valve) 16, it generates cold
`
`energy and is made to heat-exchange with the air for example, in a cooling system with the
`
`condensator 17, it can obtain the cooling temperature at -70 degrees C or less. Then, a refrigerant
`
`joins the separated oil, and is supplied to the inlet side 9 (refrigerant return end), it does in this way,
`
`and a refrigerating cycle is formed.
`
`The cooling temperature not more than abbreviation-18 degree—C—-70 degree C can be obtained by
`
`the refrigerant circuit A where the boiling point used the two—step compression equation rotary
`
`compressor 1 using the refrigerant not more than ~80 degree C excluding the chlorine group as a
`
`refrigerant.
`
`[0028]
`
`Trifluoromethane is used for the temperature (degree C) and the pressure (MPa) which were shown in
`
`Fig.1 as a refrigerant, and they show the temperature of every place of the refrigerant circuit A at the
`
`time of operating using a HAB oil as oil, and the example of a pressure.
`
`[0029]
`
`(Second embodiment of the present invention)
`
`Fig.3 is an explanatory view showing other refrigerant circuits of the present invention.
`
`As shown in Fig.3, the refrigerant circuit B of the present invention discharges the refrigerant
`
`compressed with the low stage compression element 7 of the two—step compression equation rotary
`
`compressor 1 from the discharge side 10, After cooling a refrigerant through the radiator 13, while
`
`separating into gas-liquid by the gas liquid separation device 18 and supplying the separated vapor
`
`phase component to the inlet side 11 of the high rank compression element 8, After carrying out
`
`pressure regulation of the separated liquid phase component by the capillary tube 19, the heat
`
`exchange apparatus 20 installed in the line of the discharge side 12 of the high rank compression
`
`element 8 is supplied, Heat—exchange with the refrigerant which was compressed with the high rank
`
`compression element 8, and became an elevated temperature, and it makes it evaporate
`
`substantially. And the refrigerant supplied to the heat exchange apparatus 20 through the
`
`condensator 17 in order to cool the high temperature refrigerant discharged from the high rank
`
`compression element 8 in the aforementioned liquid phase component made to evaporate is made to
`
`join. It is the same as that of the refrigerant circuit A shown in Fig.1 except having made it supply the
`
`refrigerant return end 9 of the two-step compression equation rotary compressor 1.
`
`[0030]
`
`Since a liquid phase component is not supplied to the high rank compression element 8 by separating
`
`into gas-liquid the refrigerant compressed with the low stage compression element 7, and supplying
`
`the separated vapor phase component to the inlet side 11 of the high rank compression element 8,
`
`damage to the two~step compression equation rotary compressor 1, destruction, etc. can be
`
`prevented. By ****** which heat—exchanges with the refrigerant which supplied liquid phase
`
`components, such as a separated oil returning agent, to the heat exchange apparatus 20, and was
`
`compressed with the high rank compression element 8, makes evaporate substantially, and it supplies
`
`to the refrigerant return end 9 of the two—step compression equation rotary compressor 1, While
`
`being able to prevent damage to the two—step compression equation rotary compressor 1,
`
`destruction, etc., since only the aforementioned vapor phase component is supplied to the
`
`condensator 17 of the refrigerant circuit B, low cooling temperature can be obtained more.
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`[0031]
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`Patent & Utility Modei Number Search(Detail) | J-PlatPat
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`The temperature (degree C) and the pressure (MPa) which were shown in Fig.3, The mixture (R—
`
`508A) of trifluoromethane and hexafluoroethane is used as a refrigerant, using propane, to a
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`refrigerant, it carries out and, as for 7 mass % combination, the temperature of every place of the
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`refrigerant circuit B at the time of operating using a HAB oil as oil and the example of a pressure are
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`shown as an oil returning agent.
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`[0032]
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`(A 3rd embodiment of the present invention)
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`Fig.4 is an explanatory view showing other refrigerant circuits of the present invention.
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`As shown in Fig.4, the refrigerant circuit C of the present invention is compressed into high voltage
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`with the high rank compression element 8, and is discharged from the discharge side 12, The oil in a
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`refrigerant is separated by the oil separator 14, and the separated oil is supplied to the inlet side 9
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`(refrigerant return end) of the low stage compression element 7, Separate into gas-liquid by the gas
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`liquid separation device 22, and the refrigerant which passed through the oil separator 14 supplies the
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`separated vapor phase component to the heat exchange apparatus 23, after being cooled with the
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`radiator 15, it heat—exchanged with the refrigerant which passed through the condensator 17, cooled,
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`and carried out pressure control by the capillary tube (or expansion valve) 16 ~- if after adiabatic
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`expansion is carried out, cold energy is generated and it is made to heat—exchange with the air for
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`example, in a cooling system with the condensator 17, the cooling temperature at —70 degrees C or
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`less can be obtained. After carrying out pressure regulation of the liquid phase component separated
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`by the gas liquid separation device 22 on the other hand by the capillary tube 24, it joins the
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`refrigerant which passed through the condensator 17 supplied to the heat exchange apparatus 23,
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`and is the same as that of the refrigerant circuit A shown in Fig.1 except having made it supply the
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`refrigerant return end 9 of the two-step compression equation rotary compressor 1.
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`Low cooling temperature can be obtained more by separating into gas—liquid the refrigerant
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`compressed with the high rank compression element 8, and supplying the separated vapor phase
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`component to the capillary tube (or expansion valve) 16 — the condensator 17.
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`[0033]
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`The mixture of which it N20 Received and did methane 25 mass % mixing is used for the temperature
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`(degree C) shown in Fig.4 as a refrigerant, using n-butane, to a refrigerant, it carries out and 10 mass
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`% combination shows the example of the temperature of every place of the refrigerant circuit C at the
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`time of operating using straight mineral oil as oil as an oil returning agent.
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`[0034]
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`According to the refrigerant circuit A, B, or C of the present invention, the cooling temperature not
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`more than —70 degree C can be obtained by full operation, but the cooling temperature at -18 degrees
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`C can also be obtained by operation which shortened time of ON of ON/OFF.
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`[0035]
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`Although make the refrigerant compressed with the compressor condense with a condenser, it is
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`usually liquefied, the liquefied refrigerant is evaporated with an evaporator in the conventional
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`refrigerant circuit and cold energy is generated, In the refrigerant circuit of the present invention, it is
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`also possible to carry out adiabatic expansion of the refrigerant in a supercritical state, and to
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`generate cold energy, without operating on condition of under the supercritical pressure of a
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`refrigerant, and supercritical temperature, and condensate~izing a refrigerant.
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`[0036]
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`The refrigerant used by the present invention is not limited excluding a chlorine group that the boiling
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`point should just be [ especially ] a refrigerant not more than -80 degree C. Specifically, the mixture
`of trifluoromethane, trifluoromethane, and hexafluoroethane, N20, ethane, etc. can be mentioned, for
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`example. Two or more type can also use these, mixing.
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`[0037]
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`https://www4.j-piatpat.inpit.go.jplcgi—bithran~web_cgi_ejje?u=http://www4.j-platpatinpitgojplengltranslationl2016091611472199646673916929619021D86...
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`6/10
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`

`

`2016/9/16
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`Patent & Utility Model Number Search(Detall) I J—PlatPat
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`Low—temperature cooling temperature can be further obtained by blending at least 1 type of
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`refrigerants further chosen as the refrigerant used by the present invention from tetrafluoromethane,
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`methane, and ethane. Although compounding amount in particular, such as tetrafluoromethane to the
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`refrigerant used by the present invention, methane, and ethane, is not limited, their 25 — 40 mass %
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`is preferable.
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`[0038]
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`It is not limited that the oil returning agent used by the present invention should just be [ especially ]
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`a hydrocarbon compound with oil and high compatibility. Specifically, ethane, propane, n-butane, iso—
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`butane, n-pentane, etc. can be mentioned, for example. Two or more type can also use these,
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`mixing.
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`Although the compounding amount in particular of an oil returning agent is not limited to a
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`refrigerant, it is preferable that it is the 0.1 to 14 mass %. Since the effect of oil returning may not be
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`acquired for the compounding amount of an oil returning agent with less than the 0.1 mass °/o, and
`an inflammability will become large if the 14 mass % is exceeded, it is not'preferable.
`In the case of the refrigerant circuit A shown in Fig.1, and the refrigerant circuit B shown in Fig.3, it is
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`preferable that the compounding amount of an oil returning agent is the 0.1 to 6 mass %, and, as for
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`the compounding amount of an oil returning agent, in the case of the refrigerant circuit C shown in
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`Fig.4, it is preferable that it is the six to 14 mass %.
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`[0039]
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`The oil in particular used by the present invention is not well limited as these ******** the thing of a
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`natural product or natural product origin, or synthetic compounds. Usually, if used as base oil of a
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`lubricating oil, it can be used regardless of a mineral oil system and a constructional system.
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`[0040]
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`As a mineral oil system oil, specifically a crude oil atmospheric distillation and the lubricating oil
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`fraction produced by carrying out distillation under reduced pressure, Oils, normal paraffin, etc. which
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`were refined combining refining ****, such as solvent deasphalting, solvent extraction,
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`hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid treatment, and clay
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`treatment, etc. as appropriate, such as paraffin series and a naphthene system, can be used.
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`[0041]
`moreover -— as a constructional system oil —- specific -~ for example, poly alpha olefin (polybutene ——)
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`Isoparaffi