JP2002356691A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stably operatable refrigerator wherein a main component of a refrigerant is a fluorohydrocarbon refrigerant(HFC) and a critical temperature of the refrigerant is not less than 40 deg.C. SOLUTION: The stabily operatable refrigerator is operated with a refrigerant wherein a main component is a fluorohydrocarbon(HFC) and a critical temperature of the refrigerant is not less than 40 deg.C. The refrigerator comprises of a closed type compressor 1, a condenser 2, a drying oven 5, an expansion system 3 and an evaporator 4. A base oil for the refrigerator is an alicyclic polyvalent carboxylate compound stabler than a polyol ester obtained from a reaction of an aliphatic polyol with a fatty acid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system for a refrigerant mainly comprising a fluorohydrocarbon-based refrigerant (HFC) and having a critical temperature of 40 ° C. or higher.

[0002]

2. Description of the Related Art In recent years, chlorine-based chlorofluorocarbons have been subject to restrictions on use worldwide due to environmental pollution, in particular, destruction of the ozone layer and global warming. For example, they have been used as refrigerants in refrigeration systems such as refrigerators and dehumidifiers. Fluorocarbons 12 are also subject to regulation. Instead, fluorocarbon-based refrigerants (HFC), which have no destruction of the ozone layer and have a destruction coefficient of 0, have attracted attention. Freon 134a is a representative refrigerant. A conventional refrigeration system using the chlorofluorocarbon 134a is disclosed in Japanese Patent No. 2967574.

Hereinafter, the conventional refrigeration system will be described with reference to the drawings.

FIG. 5 is a configuration diagram of a refrigeration cycle of a conventional refrigeration system, wherein 40 is a compressor, 41 is a condenser, 42 is an expansion mechanism, 43 is an evaporator, and 45 is a dryer.

[0005] The operation of the refrigeration system configured as described above will be described below.

First, the compressor 40 compresses a low-temperature, low-pressure refrigerant gas, discharges a high-temperature, high-pressure refrigerant gas, and
Send to 1. The refrigerant gas sent to the condenser 41 becomes a high-temperature, high-pressure refrigerant liquid while releasing the heat into the air, and is sent to the expansion mechanism 42. The high-temperature, high-pressure refrigerant liquid passing through the expansion mechanism becomes low-temperature, constant-pressure wet steam by the throttle effect and is sent to the evaporator 43. The refrigerant that has entered the evaporator 43 absorbs heat from the surroundings and evaporates, and the low-temperature, low-pressure refrigerant gas that has exited the evaporator 43 is drawn into the compressor 40, and the same cycle is repeated thereafter. In the conventional example, Freon 134a is used as the refrigerant, and the viscosity of the refrigerating machine oil is 2 to 70 cst at 40 ° C.,
It is 1 to 9 cst at 100 ° C. and contains at least one fatty acid ester oil group represented by the following general formulas (a) to (e) having two or more ester bonds in the molecule (provided that it is at least one ester bond). , R2 is an alkyl group having 5 to 12 carbon atoms,
A plurality of fatty acid ester oils represented by the following general formulas (a) to (e) having a carbon number of less than 5 are included among ester oils of fatty acids represented by the following general formulas (a) to (e). No refrigerating machine oil as base oil, lower critical melting temperature is 0 ℃
By using a refrigerating machine oil having a temperature of -30 ° C. or lower for a low-temperature refrigerating device such as a refrigerator, the refrigerating machine oil and the refrigerant are well compatible without being separated into two layers in the entire temperature range of the use environment. As a result, the lubricating oil film of the shaft and the bearing portion and the refrigerant heat transfer performance of the heat exchanger were guaranteed, and the performance and reliability of the compressor and the refrigerating device could be remarkably improved. (R1.CH2) 2.C. (CH2OCOR2) 2 (a) R1.CH2.C. (CH2.OCOR2) 3 (b) C. (CH2-OCOR2) 4 (c) (R2.COOH2C) 3.C CH2.O.CH2.C. (CH2.OCOR2) 3 (d) R2.COOCH2.C (R3) 2.CH2O.CO.CH2 (CH2) n-CH2.COOCH2.C (R3) 2. CH2O.CO.R2 (e) where R1: H or an alkyl group having 1 to 3 carbon atoms R3: an alkyl group having 1 to 3 carbon atoms n: an integer of 0 or 1 to 5

[0007]

However, since the refrigerating machine oil used in the above structure is a polyol ester obtained by a reaction between an aliphatic polyhydric alcohol and a fatty acid, the viscosity of such an ester-based refrigerating machine oil is reduced. In this case, it is one of the effective means to select a fatty acid having a small number of carbon atoms in the alkyl group of the fatty acid used as the raw material. However, in general, when the alkyl group of the fatty acid is reduced, there is a disadvantage that the heat and hydrolyzability of the obtained ester are reduced.

The present invention solves the conventional problems,
An object is to provide a refrigeration device that is more stable than before.

[0009]

Means for Solving the Problems The invention according to claim 1 of the present invention comprises a refrigerant mainly composed of a fluorohydrocarbon-based refrigerant (HFC) and having a critical temperature of 40 ° C. or higher; , A condenser, a dryer, an expansion mechanism, an evaporator, and a viscosity of 2 to 70 cst at 40 ° C and 1 to 9 at 100 ° C.
cst and the bilayer separation temperature with HFC is lower critical temperature-
Refrigeration oil based on an alicyclic polycarboxylic acid ester compound having a base temperature of 35 ° C. or lower and an upper critical temperature of 70 ° C. or higher, which is more stable than a polyol ester obtained by a reaction between an aliphatic polyhydric alcohol and a fatty acid. And has the effect that a stable refrigerating device can be supplied.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the hermetic compressor further includes a motor having an enamel-coated wire and an insulating film, wherein the enamel wire is a refrigerating machine oil. Any one or two types of enamels of upper polyamide imide / lower polyester imide wire (AI / EI) and upper polyamide imide / lower modified polyester (AI / HPE) compatible with cyclic polycarboxylic acid ester compounds With copper wire, the insulating film has the effect of being able to supply a stable refrigeration device by providing any one insulating film of polyethylene terephthalate, polyethylene naphthalate, polyamide imide coated polyester, polyphenylene sulfide, and polyether ether ketone. Have.

According to a third aspect of the present invention, in the first aspect of the present invention, the hermetic compressor has a suction muffler therein, and the suction muffler is a refrigerating machine oil. Compatible with low oligomer polybutylene terephthalate, paraffin-free polybutylene terephthalate, polyethylene naphthalate, polyamide imide-coated polyester, polyphenylene sulfide, and polyether ether ketone. It has the effect that the device can be supplied.

According to a fourth aspect of the present invention, in addition to the first aspect of the present invention, the hermetic compressor further includes a sliding portion, wherein the sliding portion includes a fluorocarbon-based refrigerant and an alicyclic polyvalent carboxylic acid. No problem with abrasion in the presence of acid ester compound, sliding between gray cast iron, sliding between gray cast iron and spheroidal graphite, sliding between gray cast iron and sintered metal, sliding between gray cast iron and high silicon aluminum material , Sliding between spheroidal graphite casting and high-silicon aluminum, sliding with high-silicon aluminum and carburized chromium molybdenum steel, sliding with high-silicon aluminum and nitriding chromium molybdenum steel Providing a kind of sliding material has an effect that a stable refrigerating device can be supplied.

According to a fifth aspect of the present invention, there is provided a refrigerating apparatus which is compatible with the alicyclic polycarboxylic acid ester compound which is a refrigerating machine oil and contains a foaming material and is stable in addition to the first aspect of the present invention. Can be supplied.

According to a sixth aspect of the present invention, there is provided a refrigerating apparatus which is compatible with the alicyclic polycarboxylic acid ester compound which is a refrigerating machine oil and which contains an antioxidant and is stable in addition to the first aspect of the invention. Can be supplied.

According to a seventh aspect of the present invention, there is provided a stable refrigerating apparatus which is compatible with the alicyclic polycarboxylic acid ester compound as a refrigerating machine oil and which contains an extreme pressure additive. Can be supplied.

[0016] The invention according to claim 8 provides a refrigerant having a fluorine hydrocarbon-based refrigerant (HFC) as a main component and having a critical temperature of 40 ° C or higher, a hermetic compressor, a condenser, and a dryer. , Expansion mechanism, evaporator, 2-7 when viscosity is 40 ° C
An alicyclic polyvalent carboxylic acid having 1 to 9 cst at 0 cst and 100 ° C. and having a two-layer separation temperature with a fluorohydrocarbon-based refrigerant (HFC) of lower critical temperature of −35 ° C. or lower and upper critical temperature of 70 ° C. or higher The two-layer separation temperature between the acid ester compound and the fluorohydrocarbon-based refrigerant (HFC) is lower critical temperature -35 ° C
The viscosity is matched with that of a conventionally used refrigerating machine oil by providing a refrigerating machine oil which is a mixture of two kinds of an ester alcohol obtained by a reaction between an aliphatic alcohol having a higher critical temperature of 70 ° C. or higher and a fatty acid. Thereby, it has an effect of easily replacing the conventional product.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a refrigeration apparatus according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a refrigeration cycle diagram of a refrigeration apparatus according to Embodiment 1 of the present invention.

In FIG. 1, 1 is a hermetic compressor, 2 is a condenser, 3 is an expansion mechanism, 4 is an evaporator, and 5 is a dryer.

This refrigeration system uses Freon 134a as a refrigerant, and the hermetic compressor 1 has a viscosity of 40.degree.
An alicyclic polycarboxylic acid ester compound having 1 to 9 cst at 0 cst and 100 ° C. was selected as the base oil.

By selecting this viscosity, it was confirmed that there was no problem in the performance and reliability of the compressor.

Further, an alicyclic polycarboxylic acid ester and HF
Since the two-layer separation temperature with C is lower critical temperature -35 ° C or lower and upper critical temperature 70 ° C or higher, two-layer separation can be performed at a temperature higher than the evaporator temperature -35 ° C and at a condenser temperature 70 ° C or lower. Therefore, a highly reliable apparatus could be supplied as a refrigeration apparatus without refrigeration oil remaining.

The alicyclic polycarboxylic acid ester compound used in the refrigerating machine oil includes an alicyclic ring and the following general formula (1)
And at least two of the ester groups are bonded to mutually adjacent carbon atoms in the alicyclic ring. -COOR1 (1) (In the above formula, R1 represents a hydrocarbon group having 1 to 30 carbon atoms, and R1 of each ester group may be the same or different.) The alicyclic ring referred to herein is a cyclopentane ring , A cyclohexane ring, a cycloheptane ring and the like. As a result of repeated studies, it was found that a cyclohexane ring was preferable.

In order to keep the two-layer separation temperature at -35 ° C. or lower, the alicyclic ring of the alicyclic polycarboxylic acid ester compound preferably has the following structure of a cyclohexane ring. (Chemical formula 1)
An alicyclic polycarboxylic acid ester compound represented by R1 and R2 having 4 carbon atoms is preferable. However, only hydrocarbons having 4 carbon atoms in the ester group have high extractability to organic materials, so that R1 has 4 carbon atoms and R2 in the cyclohexane ring.
Is good by mixing any one or more of the alicyclic polycarboxylic acid ester compounds having more than 4 carbon atoms or the alicyclic polycarboxylic acid ester compounds having R1 and R2 having more than 4 carbon atoms. was gotten.

The alicyclic polycarboxylic acid ester compound having 4 carbon atoms of R1 and R2 in the cyclohexane ring at that time is less than 25% of the total, so that the alicyclic polyvalent carboxylic acid compound has less aggressiveness to an organic material. An acid ester compound was obtained. Table 4 shows the results. Evaluation is Freon 1
The evaluation was performed using a shield tube of 34a and oil.

[0026]

Embedded image

As shown in Table 1, in the test of the compatibility of the materials, when the alicyclic polycarboxylic acid ester compound having 4 carbon atoms of R1 and R2 was 25% or less, the extractability was low and good results were obtained. However, it was found that when the amount exceeded 40%, the amount of extraction increased. In the hermetic compressor, it was found that it was appropriate to set the oil content to 25% or less because an oil having a low extraction amount had to be selected because a high-molecular material was contained therein.

The polyol ester obtained by reacting an aliphatic polyhydric alcohol with a fatty acid, which is a conventional example, has a small number of carbon atoms in the alkyl group of the fatty acid used as a raw material when such an ester-based refrigerator oil is reduced in viscosity. It is one of the effective means to select one, and when the alkyl group of the fatty acid becomes small, there is a drawback that the heat of the obtained ester and the hydrolyzability are reduced, and a disadvantage occurs.
Since the alkyl group of the fatty acid becomes smaller even after the decomposition, there is a concern that the acidity is high and the reaction is further accelerated after the decomposition.

[0029]

[Table 1]

In the case of an alicyclic polycarboxylic acid ester compound, the acid generated even when decomposed is an acid having an alicyclic ring, so that the acidity is lower than the above fatty acids, and the reaction is further accelerated after the decomposition. Less.

Therefore, the decomposition of the refrigerating machine oil used in the refrigerating apparatus was reduced, and a highly reliable refrigerating apparatus could be obtained.

In the evaluation of refrigerant Freon 134a and refrigerating machine oil in the compressor, condenser, expansion mechanism, evaporator, and dryer systems, the flow rate reduction rate of the capillary used in the expansion mechanism after the life test was completed. Can be evaluated. It is known that when a reaction due to decomposition occurs in the system, it accumulates in the capillary and decreases the flow rate of the capillary. If the flow rate is reduced by 30% or more compared to the initial flow rate, the refrigeration system is affected. When a test was conducted for 500 hours using WR10, which is an alicyclic polycarboxylic acid ester compound manufactured by Nisseki Mitsubishi Co., Ltd., and a polyol ester obtained by a reaction between an aliphatic polyhydric alcohol and a fatty acid, (Table 2) As described above, a refrigerating system using an alicyclic polycarboxylic acid ester compound gave good results.

Therefore, a system having no problem in reliability could be supplied.

[0034]

[Table 2]

(Embodiment 2) A cooling device according to Embodiment 1
The same thing as was used. FIG. 2 is a sectional view of the hermetic compressor of the cooling device.

In FIG. 2, reference numeral 10 denotes refrigerating machine oil which is stored at the bottom of the sealed container 11. A compressor 12 is driven by the motor 6. The motor 6 includes an enamel-coated wire 7, an insulating film 8, and the like. As the evaluation of the enameled wire 7, the results of evaluating the behavior in the presence of Freon 134a and an alicyclic polycarboxylic acid ester are shown in Table 3.

[0037]

[Table 3]

For the evaluation of Freon 134a and lubricating oil, characteristic deterioration was confirmed by a shield tube test.

The evaluation of the enameled wire was performed based on the dielectric breakdown retention. The dielectric breakdown retention is a relative value obtained by dividing the value after the test by the value (100) before the test.

The evaluation of the insulating film was made based on the tensile retention. The tensile retention is a relative value obtained by dividing the value after the test by the value (100) before the test.

As shown in Table 4, the upper polyamide imide / lower polyester imide line (AI / EI) and the upper polyamide imide / lower modified polyester (AI / H)
PE), the enameled wire had a dielectric breakdown retention ratio of 95% or more, and it was found that deterioration was not a problem. As a comparison, it was found that the retention rate of the polyester wire (PEW) was 40% or less and the degree of deterioration was high, so that it was not possible to use an alicyclic polycarboxylic acid ester.

[0042]

[Table 4]

Table 4 shows the evaluation of the insulating film. For the evaluation of the Freon 134a and the lubricating oil, the deterioration of the properties of the enamel-coated wire and the insulating film was confirmed by a shield tube test. As shown in Table 4, all of polyethylene terephthalate, polyethylene naphthalate, polyamide imide coated polyester, polyphenylene sulfide, and polyether ether ketone had a retention of 80% or more, and there was no practical problem.

Accordingly, in the refrigerant Freon 134a and the alicyclic polycarboxylic acid ester compound which is a refrigerating machine oil, the upper polyamide imide / lower polyester imide wire (A
I / EI), an enameled copper wire of upper layer polyamideimide / lower layer modified polyester (AI / HPE) and an insulating film of polyethylene terephthalate, polyethylene naphthalate, polyamideimide coated polyester, polyphenylene sulfide, and polyether ether ketone. By selection, a system with no problem in reliability could be supplied.

It has been confirmed that the same effect can be obtained by using any one or more of the above-described copper wires for the enameled copper wire.

Also, it has been confirmed that the same effect was obtained even when one or more types of copper wires specified above were used for the insulating film.

Accordingly, a system having no problem in reliability could be supplied.

(Embodiment 3) A cooling device according to Embodiment 1
The same thing as was used. FIG. 3 is a sectional view of a compressor of the cooling device.

In FIG. 3, reference numeral 9 denotes a suction muffler.
As the evaluation of the inhalation muffler 9, the results of evaluating the behavior in the presence of Freon 134a and an alicyclic polycarboxylic acid ester are shown in Table 5. As shown in Table 5, all of the low oligomer polybutylene terephthalate, polybutylene terephthalate containing no paraffin, polyamide imide coated polyester, polyphenylene sulfide, and polyether ether ketone had a retention of 9
It was 0% or more, and there was no practical problem.

[0050]

[Table 5]

As described in Example 1, a test was performed to evaluate the reduction in capillary flow rate.
The result was as follows. The material used at this time was low oligomer polybutylene terephthalate Toray 120
1G-15-S was used, and WR10 which is an alicyclic polycarboxylic acid ester compound manufactured by Nisseki Mitsubishi Corporation was used as an oil. As a result, the flow rate reduction rate was 5% or less, which was a level with no problem for the refrigeration system.

This tendency is also observed in polybutylene terephthalate, polyamide-imide-coated polyester, polyphenylene sulfide, and polyether ether ketone, which do not contain low oligomer components or impurities, and do not contain paraffin.

It has been confirmed that the same effect can be obtained by using any one or more of the materials specified above for the suction muffler.

Accordingly, a system having no problem in reliability could be supplied.

(Embodiment 4) The cooling device is Embodiment 1
The same thing as was used. FIG. 4 is a sectional view of the hermetic compressor of the cooling device.

In FIG. 4, reference numeral 1 is a sectional view of the hermetic compressor. The behavior of the sliding part used in the hermetic compressor in the presence of Freon 134a and an alicyclic polycarboxylic acid ester was evaluated. As an evaluation method of the sliding portion of the hermetic compressor, evaluation was performed using an environmental wear tester in the presence of refrigerant oil.

The material used is F as gray cast iron.
FCD-500 as a C-200 spheroidal graphite cast iron, sintered metal having a hardness of HRB70, ADC14 as a high silicon aluminum, SCM4 as a chromium molybdenum steel
15 were used. As for the sliding between the castings, manganese phosphate treatment was performed on one side because the same kind of metal easily adhered.

Sliding between FC-200 (one side manganese phosphate treatment), FC-200 (surface manganese phosphate treatment)
Between FCD-500 and FCD-500, FC-200 and FCD-5
Sliding with 00 (surface manganese phosphate treatment), FC-20
0, sliding of sintered metal, sliding of FC-200 and ADC14, sliding of FCD-500 and ADC14, ADC-1
4 with SCM415 which has been carburized, AD
It was confirmed that the wear amount was 5 μm or less in any combination of C14 and the SCM415 subjected to the nitriding treatment, and there was no problem.

Therefore, a system having no problem in reliability could be supplied. (Embodiment 5) A cooling device is a system similar to that of Embodiment 1. The evaluation was performed using an alicyclic polycarboxylic acid ester compound containing a foaming material in a refrigerating machine oil inside a refrigerating device mainly containing a fluorohydrocarbon-based refrigerant (HFC).

As an evaluation method, as described in Example 1, a test for evaluating a reduction in capillary flow rate was performed. Refrigeration oil was prepared by adding dimethylsiloxane 4 to WR10, which is an alicyclic polycarboxylic acid ester compound manufactured by Mitsubishi Nisseki.
It was performed by adding 20 to 100 ppm of a substance having a viscosity of 0 to 100 cst. When the test time was 500 hours, the rate of decrease in the capillary flow rate was 5% or less, which was at a level without any problem.

Therefore, a system having no problem in reliability even when a foaming agent was added could be supplied. (Embodiment 6) The cooling device is a system similar to that of Embodiment 1. The evaluation was performed using an alicyclic polycarboxylic acid ester compound containing an antioxidant in a refrigerating machine oil inside a refrigerating apparatus mainly containing a fluorohydrocarbon-based refrigerant (HFC). Dibutyl paracresol (DBPC) was used as an antioxidant.

As described in Example 1, a test for evaluating a reduction in the capillary flow rate was performed. The refrigerating machine oil was prepared by adding 0.05 to 0.2 wt% of dibutyl paracresol (DBPC) to WR10 which is an alicyclic polycarboxylic acid ester compound manufactured by Nisseki Mitsubishi Corporation. When the test time was 500 hours, the rate of decrease in the capillary flow rate was 5% or less, which was at a level without any problem.

Therefore, a system having no problem in reliability even when an antioxidant was added could be supplied.

(Embodiment 7) A cooling device according to Embodiment 1
In a similar system. Fluorohydrocarbon refrigerant (H
The evaluation was carried out using an alicyclic polycarboxylic acid ester compound containing an extreme pressure additive in a refrigerating machine oil inside a refrigerating device mainly composed of FC). Tricresyl phosphate (TCP) was used as an extreme pressure additive.

As described in Example 1, a test was performed to evaluate the reduction in capillary flow rate. The refrigerating machine oil was prepared by adding 0.5 to 0.3 wt% of tricresyl phosphate (TCP) to WR10 which is an alicyclic polycarboxylic acid ester compound manufactured by Mitsubishi Nisseki. When the test time was 500 hours, the rate of decrease in the capillary flow rate was 5% or less, which was at a level without any problem.

The amount of wear of the sliding material of the hermetic compressor is 5
μm or less, which was a level without any problem.

Therefore, it was possible to supply a system having no problem in reliability even if the extreme pressure agent was added. (Embodiment 8) The cooling system of the cooling system in the same system as that of Embodiment 1 is based on a cycloaliphatic polycarboxylic acid ester compound as a base oil, and the carbon number of R1 and R2 in the cyclohexane ring structure (Formula 1). Is a mixture of an alicyclic polyvalent carboxylic acid ester compound represented by Formula (4) and a monocarboxylic acid ester having one ester group. The effect of this is that the performance of the hermetic compressor is the same by adjusting the viscosity at 65 ° C., which is the performance measurement condition of hermetic compressor, with monocarboxylic acid in order to replace the oil with the conventional ISO VG10 grade oil. Using a hermetic compressor with a cylinder capacity of 5.7 CC, discharge pressure 1015 k
oil under the conditions of pa and suction pressure of 85 kpa,
An evaluation was performed. (Table 6) shows the results. Since the alicyclic polycarboxylic acid ester compound must have a ring due to its structure, it is difficult to adjust the viscosity. To compensate for the viscosity, a monocarboxylic acid is mixed to obtain a conventional ISO VG10 compound.
We were able to supply a hermetic compressor with the same performance as the grade. As a result, the performance was not changed even if the conventional oil was changed to this oil.

[0068]

[Table 6]

Therefore, the viscosity can be matched with that of the conventionally used refrigerating machine oil, and it can be easily replaced with the conventional product.

[0070]

As described above, the invention according to claim 1 comprises a refrigerant having a fluorocarbon refrigerant (HFC) as a main component and a critical temperature of 40 ° C. or higher, a hermetic compressor, A condenser, a dryer, an expansion mechanism, an evaporator, and a viscosity of 2 to 70 cst at 40 ° C and 1 to 9 at 100 ° C.
It is cst and the two-layer separation temperature with HFC is lower critical temperature -35 ° C or lower and upper critical temperature is 70 ° C or higher, which is more stable than polyol ester obtained by reaction of aliphatic polyhydric alcohol and fatty acid. A stable refrigerating device can be supplied because the refrigerating device includes a refrigerating machine oil having an alicyclic polycarboxylic acid ester compound as a base oil.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the hermetic compressor has a motor having an enamel-coated wire and an insulating film, and the enamel wire is made of refrigeration oil. Any one of enamel copper of upper polyamide imide / lower polyester imide wire (AI / EI) and upper polyamide imide / lower modified polyester (AI / HPE), which is compatible with a certain alicyclic polycarboxylic acid ester compound. A stable refrigerating apparatus can be supplied by providing a wire and the insulating film including any one of polyethylene terephthalate, polyethylene naphthalate, polyamide imide coated polyester, polyphenylene sulfide, and polyether ether ketone.

According to a third aspect of the present invention, in addition to the first aspect, the hermetic compressor has a suction muffler therein, and the suction muffler is a refrigerating machine oil alicyclic polyvalent. Compatible with carboxylic acid ester compounds,
Low oligomer polybutylene terephthalate, polybutylene terephthalate containing no paraffin, polyethylene naphthalate, polyamide imide coated polyester,
A stable refrigerating apparatus can be supplied by providing any one of polyphenylene sulfide and polyether ether ketone.

According to a fourth aspect of the present invention, in addition to the first aspect, the hermetic compressor has a sliding portion, and the sliding portion is an alicyclic polyvalent carboxylic acid which is a refrigerating machine oil. Sliding parts compatible with acid ester compounds, sliding between gray cast irons, sliding between gray cast iron and spheroidal graphite, sliding between gray cast iron and sintered metal, sliding between gray cast iron and high silicon aluminum material Dynamic, sliding between spheroidal graphite casting and high silicon aluminum, sliding between high silicon aluminum and chromium molybdenum steel after carburizing, sliding between high silicon aluminum and chromium molybdenum steel after nitriding A stable refrigerating device can be supplied by providing any one of the sliding materials.

A fifth aspect of the present invention provides, in addition to the first aspect of the present invention, a stable refrigeration which is compatible with the alicyclic polycarboxylic acid ester compound which is a refrigerating machine oil and contains a foaming material. Equipment can be supplied.

According to a sixth aspect of the present invention, there is provided a refrigeration apparatus which is compatible with the alicyclic polycarboxylic acid ester compound which is a refrigerating machine oil and which contains an antioxidant. Can be supplied.

According to a seventh aspect of the present invention, there is provided a refrigerating apparatus which is compatible with the alicyclic polycarboxylic acid ester compound which is a refrigerating machine oil in addition to the first aspect of the invention, and which contains an extreme pressure additive and is stable. Can be supplied.

[0077] The invention according to claim 8 provides a refrigerant which is mainly composed of a fluorohydrocarbon-based refrigerant (HFC) and has a critical temperature of 40 ° C or higher, a hermetic compressor, a condenser, and a dryer. , Expansion mechanism, evaporator, and 2 to 7 when the viscosity is 40 ° C.
An alicyclic polyvalent carboxylic acid having 1 to 9 cst at 0 cst and 100 ° C. and having a two-layer separation temperature with a fluorohydrocarbon-based refrigerant (HFC) of lower critical temperature of −35 ° C. or lower and upper critical temperature of 70 ° C. or higher The two-layer separation temperature between the acid ester compound and the fluorohydrocarbon-based refrigerant (HFC) is lower critical temperature -35 ° C
The viscosity is matched with that of a conventionally used refrigerating machine oil by providing a refrigerating machine oil which is a mixture of two types of an ester oil obtained by a reaction between an aliphatic alcohol having a higher critical temperature of 70 ° C. or higher and a fatty acid. Thereby, it can be easily replaced with a conventional product.

[Brief description of the drawings]

FIG. 1 is a refrigeration system diagram of a refrigeration apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a hermetic compressor according to a second embodiment of the refrigeration apparatus according to the present invention.

FIG. 3 is a sectional view of a hermetic compressor according to a third embodiment of the refrigeration apparatus according to the present invention.

FIG. 4 is a sectional view of a hermetic compressor according to a fourth embodiment of the refrigeration apparatus according to the present invention.

FIG. 5 is a refrigeration system diagram of a conventional refrigeration apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hermetic compressor 2 Condenser 3 Expansion mechanism 4 Evaporator 5 Dryer 6 Motor 7 Enamel wire 8 Insulation film 9 Suction muffler

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Claims (8)

[Claims] 1. A refrigerant mainly composed of a fluorohydrocarbon-based refrigerant (HFC) having a critical temperature of 40 ° C. or higher, a hermetic compressor, a condenser, a dryer, an expansion mechanism, and an evaporator. And an alicyclic polyether having a viscosity of 2 to 70 cst at 40 ° C., 1 to 9 cst at 100 ° C., and a bilayer separation temperature with HFC of lower critical temperature −35 ° C. or lower and upper critical temperature of 70 ° C. or higher. A refrigerating machine oil having a polyvalent carboxylic ester compound as a base oil, wherein the refrigerating machine oil has at least two ester groups represented by the following general formula (1), and at least two of the ester groups are alicyclic. A refrigerating device comprising an alicyclic polycarboxylic acid ester compound bonded to cyclic adjacent carbon atoms. -COOR1 (1) (In the above formula, R1 represents a hydrocarbon group having 1 to 30 carbon atoms, and R1 of each ester group may be the same or different.) 2. The hermetic compressor has a motor having an enamel-covered wire and an insulating film, wherein the enamel wire is
Upper polyamide imide / lower polyester imide wire (A
I / EI), an upper layer polyamide imide / a lower layer modified polyester (AI / HPE), and the insulating film is made of polyethylene terephthalate, polyethylene naphthalate, polyamide imide coated polyester, polyphenylene sulfide, or polyphenylene sulfide. The refrigeration apparatus according to claim 1, further comprising an insulating film of any one of ether ether ketone. 3. The hermetic compressor has a suction muffler inside, wherein the suction muffler includes low oligomer polybutylene terephthalate, paraffin-free polybutylene terephthalate, polyethylene naphthalate, polyamideimide-coated polyester, polyphenylene sulfide, and 2. The refrigeration apparatus according to claim 1, wherein the refrigeration apparatus comprises any one of polyetheretherketone. 4. A hermetic compressor having a sliding portion, wherein the sliding portion slides between gray cast irons, slides between gray cast iron and spheroidal graphite, slides between gray cast iron and sintered metal, Sliding between gray cast iron and high silicon aluminum material, sliding between spheroidal graphite casting and high silicon aluminum, sliding with high silicon aluminum and carburized chromium molybdenum steel, nitriding with high silicon aluminum The refrigeration apparatus according to claim 1, further comprising a sliding material selected from a group consisting of sliding with chromium molybdenum steel. 5. The refrigerating apparatus according to claim 1, wherein a foaming material is contained in the refrigerating machine oil. 6. The refrigerating apparatus according to claim 1, wherein an antioxidant is contained in the refrigerating machine oil. 7. The refrigerating apparatus according to claim 1, wherein the refrigerating machine oil contains an extreme pressure additive. 8. A refrigerant mainly composed of a fluorohydrocarbon refrigerant (HFC) having a critical temperature of 40 ° C. or higher, a hermetic compressor, a condenser, a dryer, an expansion mechanism, an evaporator, And a viscosity of 2 to 70 cst at 40 ° C. and 1 to 9 cst at 100 ° C.
A) The alicyclic polycarboxylic acid ester compound having a lower critical temperature of −35 ° C. or lower and the upper critical temperature of 70 ° C. or higher (the alicyclic polycarboxylic acid ester compound is represented by the following general formula (C)): An alicyclic polycarboxylic acid ester compound having at least two ester groups represented by 1), and at least two of the ester groups are bonded to carbon atoms adjacent to each other on the alicyclic ring); Fluorohydrocarbon refrigerant (HF
A refrigerating apparatus comprising a mixture of two kinds of ester oils obtained by a reaction between an aliphatic alcohol having a lower critical temperature of −35 ° C. or lower and an upper critical temperature of 70 ° C. or higher and a fatty acid. -COOR1 (1) (In the above formula, R1 represents a hydrocarbon group having 1 to 30 carbon atoms, and R1 of each ester group may be the same or different.)