JPH1054618A - Refrigeration cycle device using ternary mixed refrigerant - Google Patents

Abstract

(57) [Summary] To provide a refrigeration cycle apparatus using a high-efficiency three-component mixed refrigerant as a substitute for R22. An R32 / R125 discharged from a compressor 1 is provided.
/ R134a three-component mixed refrigerant
When the capillary tube 5 is used as a decompression device, the suction pipe 8 connecting the capillary tube 5 and the evaporator / compressor is subjected to counter-flow heat exchange. It is to let. Further, a plurality of oil return holes are provided in the accumulator 7 in the vertical direction, and a mineral oil, an alkylbenzene-based oil, a mixed oil thereof, and a small amount of hydrocarbons for improving compatibility are provided as a lubricant for the compressor. It uses a lubricating oil which has a boiling point of +4 as hydrocarbons to be mixed.
Alkane-based saturated hydrocarbons at 5 ° C. or higher are desirable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example,
The present invention relates to a refrigeration cycle apparatus using a ternary mixed refrigerant, which is used in place of a refrigeration cycle apparatus such as a large refrigerator or a vending machine using the same.

[0002]

2. Description of the Related Art Conventionally, a refrigerating cycle device such as a large refrigerator or a vending machine has a compressor, a condenser, a throttle device such as a capillary tube or an expansion valve, a single or a plurality of evaporators, etc. connected by piping. By circulating the refrigerant through
Performs a cooling action. In these refrigeration cycle apparatuses, R502 (azeotropic mixed refrigerant of chlorodifluoromethane R22 and chloropentafluoroethane R115, boiling point: −45.3 ° C.) has been used as a refrigerant.
Due to its stratospheric ozone depletion potential, its use has already been determined by the Montreal International Convention,
2 (chlorodifluoromethane, boiling point: -40.8 ° C). However, since R22 also has some stratospheric ozone depletion potential, R2
There is a move to abolish the use and production of 2.

[0003] On the other hand, in order to make the influence on the stratospheric ozone layer almost negligible, it is necessary that the molecular structure does not contain chlorine. Fluorocarbons (HFC
A mixed refrigerant comprising s) has been proposed. Conventional R502
As a substitute refrigerant for a refrigeration cycle device such as a large refrigerator, a vending machine, etc., a two-component mixed refrigerant composed of R125 / R143a proposed as a substitute refrigerant of R502 and a refrigerant composed of R125 / R143a / R134a have been proposed.
Component-mixed refrigerants have been considered promising. Where R125, R
143a, each single refrigerant R134a, respectively, pentafluoroethane (CF ₃ -CHF _2, R125, boiling point: -48
° C.), 1,1,1-trifluoroethane (CF ₃ -CH _3, R
143a, boiling point: -48 ° C.), 1,1,1,2-tetrafluoroethane _{(CF 3 -CH 2 F, R134a} , boiling point: -27
° C).

[0004]

However, the conventional R125 / R143a and R125 / R143a / R13
4a has a theoretical and experimental performance of R22
It has been clarified in subsequent studies that the temperature of the refrigerant is less than that of R125 and R143a.

As an alternative refrigerant, R32 / R125 / R1 has been proposed as an alternative refrigerant to R22.
A three-component mixed refrigerant consisting of 34a is a candidate. Where R
32 single refrigerants are difluoromethane (CH ₂ F ₂ , R3
2, boiling point: -52 ° C), and R125 and R134a are as described above. However, the three-component mixed refrigerant has a problem that the discharge temperature is higher than that of the mixed refrigerant containing a large amount of R125 or R143a.

[0006] In view of the above-mentioned conventional problems, the present invention provides a refrigeration cycle apparatus including R32 / R125 / R134a.
It is an object of the present invention to provide a refrigeration cycle apparatus using a three-component mixed refrigerant that can lower the discharge temperature thereof even when using a mixed refrigerant of components.

[0007]

According to the present invention, there is provided a compressor, and R32 and R32 discharged from the compressor.
A condenser for cooling a three-component mixed refrigerant containing 125 and R134a; a condenser for condensing the cooled refrigerant;
A pressure reducing device having one or more capillary tubes or an expansion valve for decompressing the condensed refrigerant, and one or more evaporators for evaporating the decompressed refrigerant, and one or more evaporators and the compressor. This is a refrigeration cycle apparatus using a three-component mixed refrigerant in which an accumulator connected between the two pipes is connected.

According to a second aspect of the present invention, the ternary mixed refrigerant comprises substantially 20 to 30% by weight of R32 and substantially 1% by weight.
5 to 25% by weight of R125 and substantially 50 to 60% by weight
This is a refrigeration cycle apparatus using a ternary mixed refrigerant containing R134a.

According to a third aspect of the present invention, when the capillary tube is used as the expansion device, counterflow heat exchange is performed between the capillary tube and a pipe connected between the evaporator and the compressor. This is a refrigeration cycle apparatus using a three-component mixed refrigerant.

According to a fourth aspect of the present invention, a pipe on the outlet side of the evaporator is connected to an upper part of the accumulator, and one end of the lower part of the accumulator is connected to a suction port of the compressor. The other end of the pipe connected to the side is inserted substantially upward, and a plurality of oil return holes are formed in a side wall portion of the inserted one end, and these oil return holes are inserted into the oil return hole. This is a refrigeration cycle apparatus using three-component mixed refrigerants having different distances from one end of the one end.

According to a fifth aspect of the present invention, the upper part of the accumulator is connected to a pipe on the suction port side of the compressor, and the lower part of the accumulator has one end connected to the outlet of the evaporator. The other end of the pipe connected to the pipe side is inserted substantially upward, and a plurality of oil return holes are formed in a side wall portion of the inserted one end, and these oil return holes are inserted into the oil return hole. This is a refrigeration cycle apparatus using three-component mixed refrigerants having different distances from the top end of one end.

[0012] The present invention according to claim 6 is a mixture of a mineral oil, an alkylbenzene-based oil, or a mixed oil thereof, or a mixture of the mineral oil, an alkylbenzene-based oil, or a mixed oil thereof, and a hydrocarbon. Is a refrigeration cycle apparatus using a three-component mixed refrigerant which uses as a lubricating oil for the compressor.

According to a seventh aspect of the present invention, the hydrocarbons are for improving the compatibility between the refrigerant and the lubricating oil, and the alkane-based saturated hydrocarbon having a boiling point of + 45 ° C. or higher. This is a refrigeration cycle apparatus using a three-component mixed refrigerant.

According to the present invention as set forth in claim 8, the compressor comprises:
Having a compression cylinder for compressing the refrigerant inside the high-pressure shell, discharging the refrigerant compressed in the compression cylinder into the high-pressure shell, and then discharging the refrigerant from the high-pressure shell to the outside, The refrigerant cooled by the cooler is a refrigeration cycle apparatus that uses a ternary mixed refrigerant that is sent to the condenser once through a pipe provided in the high-pressure shell.

According to a ninth aspect of the present invention, in the compressor,
A high-pressure shell has a compression cylinder for compressing the refrigerant, and the refrigerant compressed in the compression cylinder is directly discharged from the compression cylinder to the outside of the high-pressure shell, and cooled by the cooler. The refrigerant thus obtained is a refrigeration cycle apparatus using a three-component mixed refrigerant which is once released into a high-pressure shell of the compressor, released from the high-pressure shell again, and sent to the condenser.

According to a tenth aspect of the present invention, there is provided the condenser for diverting the refrigerant to each of the plurality of refrigerant circuits including the capillary tube or the expansion valve and the evaporator, and the plurality of refrigerant circuits. And a plurality of solenoid valves connected to each of the plurality of refrigerant circuits, using a three-component mixed refrigerant.

According to the present invention, the evaporators provided in the plurality of refrigerant circuits are respectively arranged in individual load chambers, and the plurality of solenoid valves are controlled based on the temperature control of each load chamber. This is a refrigeration cycle apparatus using a three-component mixed refrigerant for controlling the opening and closing of the refrigerant.

In the present invention, the cooler cools the three-component mixed refrigerant containing R32, R125 and R134a discharged from the compressor, the condenser condenses the cooled refrigerant, and the expansion device comprises: Having one or more capillary tubes or expansion valves to decompress the condensed refrigerant, one or more evaporators evaporate the depressurized refrigerant, and an accumulator between the evaporator and the compressor Connected to.

As a result, R3 discharged from the compressor
An increase in the discharge temperature of the three-component mixed refrigerant containing R2, R125, and R134a can be suppressed.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The refrigeration cycle apparatus according to the present invention uses a three-component mixed refrigerant consisting of R32 / R125 / R134a, and uses R32 near 20 to 30% by weight,
Compared to a mixed refrigerant containing about 25% by weight of R125 and about 50 to 60% by weight of R134a, and containing a large amount of R125 and R143a, it has both reduced GWP and improved coefficient of performance (COP) to reduce global warming. The effect can be reduced, the refrigerant discharged from the compressor is once cooled in the cooler, then the condenser, one or more capillary tubes and expansion devices such as expansion valves, one or more evaporators, R32 / R125 / R134a was connected by piping so that it could be sucked into the compressor via an accumulator etc.
It is possible to solve problems such as an increase in the discharge temperature when using a three-component mixed refrigerant composed of:

When a capillary tube is used as a decompression device, the suction pipe connecting the capillary tube and the evaporator / compressor is subjected to counter-flow heat exchange.
Utilizing the feature that the three-component mixed refrigerant consisting of 32 / R125 / R134a is a non-azeotropic mixed refrigerant, even when the refrigerant is not evaporated at the evaporator outlet, heat is effectively exchanged with the capillary tube and the capillary tube Since the refrigerant flowing inside is cooled while performing the depressurizing action, the dryness of the refrigerant at the evaporator inlet is reduced, and the evaporating capacity of the evaporator is increased,
Further improvement in the coefficient of performance (COP) can be expected.

Further, in order to ensure compatibility with a refrigerant consisting of only R32 / R125 / R134a fluorocarbons (HFCs), when an ester-based oil is used as a compressor lubricating oil, a rotary compressor is used. When a compressor is used, the contact temperature at the tip of the vane tends to rise, and the hydrolysis of ester oils is easily promoted. Therefore, mineral oils, alkylbenzene oils, mixed oils and compatible oils are used as lubricants for compressors. In order to improve lubrication, a lubricating oil mixed with a small amount of hydrocarbons is used. Due to the poor compatibility with the refrigerant consisting of only R32 / R125 / R134a fluorocarbons (HFCs) at this time, in the accumulator, an upper layer mainly composed of lubricating oil,
It is easy to be separated into a mixed layer of intermediate lubricating oil and refrigerant and a lower layer mainly composed of refrigerant.However, this problem point is ensured by returning the lubricating oil to the compressor by a plurality of oil return holes provided vertically. is there.

Further, only fluorinated hydrocarbons (HFCs)
Of refrigerant consisting of mineral oil and alkylbenzene oil
As hydrocarbons mixed in small amounts to improve solubility
Alkane-based saturated hydrocarbons are desirable for thermal stability
The leakage of hydrocarbons during operation of the refrigeration cycle
To avoid flammability hazards due to large refrigerators, automatic
Average condensing temperature of refrigeration cycle equipment such as vending machines
Hydrocarbons having a boiling point of + 45 ° C. or higher are desirable. this
Alkane-based saturated carbon with a boiling point of + 45 ° C or higher
Hydrogens include n-hexane (C₆H₁₄, Boiling point: +6
9 ° C), 2-methylpentane (C₆H₁₄, Boiling point: +60
C), 3-methylpentane (C₆H₁₄, Boiling point: +63
° C), 2,2-dimethylbutane (C₆H₁₄, Boiling point: +50
° C), 2,3-dimethylbutane (C₆H₁₄, Boiling point: +58
° C), n-heptane (C₇H₁₆, Boiling point: + 98 ° C), 2-
Methylhexane (C₇H₁₆, Boiling point: + 90 ° C), 3-methyl
Hexane (C ₇H₁₆, Boiling point: + 92 ° C), 2,2-dimethyl
Chilpentane (C₇H₁₆, Boiling point: + 79 ° C), 2,3-di
Methylpentane (C₇H₁₆, Boiling point: + 90 ° C), 2,4-
Dimethylpentane (C₇H₁₆, Boiling point: + 80 ° C), 3,3
-Dimethylpentane (C₇H₁₆, Boiling point: + 86 ° C), 3-
Ethyl pentane (C₇H₁₆, Boiling point: + 93 ° C), 2, 2,
3-trimethylbutane (C₇H₁₆, Boiling point: + 81 ° C), n
-Octane (C₈H₁₈, Boiling point: + 126 ° C), n-nonane
(C₉H₂₀, Boiling point: + 151 ° C), n-decane (C_TenH_{twenty two},
Boiling point: + 174 ° C), n-undecane (C₁₁H_{twenty four},boiling point:
+ 196 ° C).

Hereinafter, embodiments of the present invention will be further described.

(Embodiment 1) Some mixed compositions of the three-component mixed refrigerant used in the refrigeration cycle apparatus according to the present invention will be described below.

Table 1 shows R3, which is a component of the present invention.
It compares the ideal refrigeration performance of some mixed compositions of 2 / R125 / R134a mixed refrigerant with the presumed mixed composition of mixed refrigerants rich in R125 and R143a. The conditions are as follows: the compressor suction temperature is 30 ° C., the condensation average temperature is 45 ° C., the evaporation average temperature is −15 ° C., the condenser outlet supercooling degree is 0 deg, and the evaporator outlet superheat degree is 15 deg. Includes the enthalpy of superheat at the evaporator outlet. As a reference for comparison, refrigerant R22
And refrigerant R502.

At this time, the condensation pressure of R22 is 1.723 MPa,
The evaporation pressure is 0.295 MPa, and the condensing pressure of R502 at this time is 1.873 MPa, and the evaporation pressure is 0.346 MPa. / R1
The theoretical coefficient of performance (COP) of the mixed refrigerant of No. 34a is R
Not only does it not reach 22 or R502, but also the condensing pressure and the evaporating pressure increase.

On the other hand, the exemplified R32 / R125 / R13
4a The theoretical coefficient of performance (COP) of the mixed refrigerant is R50
2 and is not only equivalent to R22, but also substantially equal in condensation pressure and evaporation pressure to R22 and R502. 3
Since the composition of 0/20/50% by weight has a higher composition ratio of R32 having a higher vapor pressure than R22, the condensing pressure and the evaporating pressure slightly increase, and the discharge temperature also slightly increases, but the refrigeration capacity and the coefficient of performance ( COP) both exhibit better properties than the 23/25/52% by weight composition. 25/15/60
In the composition by weight, the composition ratio of R125 having a higher vapor pressure than R22 is smaller, so that the condensing pressure and the evaporating pressure slightly decrease, the discharge temperature slightly increases, and the refrigerating capacity is 23/25/5.
Coefficient of performance (C
OP) shows better properties than the 23/25/52% by weight composition.

Further studying the global warming potential (GWP) of the ternary mixed refrigerant, which is a component of the present invention, shows that fluorocarbon refrigerants have an effect on global warming which is another environmental problem. The indicated global warming potential (hereinafter referred to as GWP) is said to have the same effect as R22. IPCC (IntergovermentalPa) in 1995
nel on Climate Change (Intergovernmental Panel on Climate Change) reports that when GWP of carbon dioxide (CO ₂ ) is set to 1, the comparison value for each of the 20-year, 100-year, and 500-year horizontal axes is R22. GWP of 4300, 1700, 52
0, G of R32 among fluorinated hydrocarbons containing no chlorine
WP is 2100, 650, 200, GWP of R125 is 4600, 2800, 920, GWP of R143a is 5
GWP of 000, 3800, 1400, R134a is 3
400, 1300, and 420.

Therefore, when the GWP of carbon dioxide (CO ₂ ) of each mixed refrigerant shown in Table 1 is set to 1, the comparison values for the respective 20-year, 100-year, and 500-year horizontal axes upon integration are: It is calculated as shown in Table 1). R shown in (Table 1)
The 32 / R125 / R134a mixed refrigerant is R125 or R
R1 having a higher GWP than a mixed refrigerant containing a large amount of 143a
Since the composition ratio of 25 or R143a is small, not only the GWP is small over the entire period, but also the GWP can be reduced as compared with R22.

20 to 30% by weight of R32 and 15 to 25%
A three-component mixed refrigerant consisting of R125% by weight and R134a of 50 to 60% by weight exhibits good characteristics of performance (COP), and it is possible to determine the composition which becomes nonflammable near these composition ranges. As compared with the mixed refrigerant containing a large amount of R125 or R143a, the GWP is reduced and the coefficient of performance (C
OP), the impact on global warming can be reduced.

It should be noted that the present invention relates to a ternary refrigerant mixture containing substantially 20 to 30% by weight of R32, substantially 15 to 25% by weight of R125, and substantially 50 to 60% by weight of R134a. The above means that the upper limit value and the lower limit value indicating each of the above numerical ranges are allowed to fluctuate in a range of about ± 2% by weight, respectively. Thus, for example, R
The fact that 125% by weight is substantially 15 to 25% by weight includes the range of 13 to 27% by weight. This is because, if the change of each mixing ratio of these three-component mixed refrigerants is within the range of ± 2% by weight as described above, there is no change that greatly affects the refrigerating capacity and the coefficient of performance.

Here, R32 / R125 / R13
A disadvantage of the three-component mixed refrigerant composed of 4a compared with the mixed refrigerant containing a large amount of R125 or R143a is that the discharge temperature rises, and the present invention has improved this by contriving the refrigeration cycle device. Specifically, by providing a cooler between the compressor and the condenser for once cooling the three-component mixed refrigerant including R32, R125, and R134a discharged from the compressor (see FIG. 1). ) To lower the discharge temperature. This will be further described later.

[0034]

[Table 1]

(Embodiment 2) Next, an embodiment of a refrigeration cycle apparatus using a ternary mixed refrigerant according to the present invention will be described with reference to FIG. Here, the configuration and operation of an embodiment in which the above-described three-component mixed refrigerant is applied to a refrigeration cycle device of a large refrigerator having one evaporator will be described.

In the refrigeration cycle apparatus shown in FIG.
The compressor 1 has a compression cylinder 102 for compressing the refrigerant inside the high-pressure shell 101, discharges the refrigerant compressed in the compression cylinder 102 into the high-pressure shell 101, It is discharged to a cooler 2 described later. The cooler 2 is means for temporarily cooling the refrigerant discharged from the compressor 1. The refrigerant cooling pipe 3 in the compressor is a pipe for guiding the refrigerant cooled by the cooler 2 again into the high-pressure shell 101 of the compressor 1 and cooling the refrigerant discharged into the high-pressure shell 101. Connected to the container 4. It should be noted that a state in which the discharged refrigerant 200a discharged from the compression cylinder 102 exists inside the high-pressure shell 101 of the compressor 1 shown in FIG. The condenser 4 is a means for condensing the cooled refrigerant, and includes a capillary tube 5
Is means for reducing the pressure of the refrigerant condensed in the condenser 4. The evaporator 6 is a means for evaporating the refrigerant decompressed by the capillary tube 5 and cools the inside of a large refrigerator (not shown). The accumulator 7 is connected to an outlet pipe of the evaporator 6, and is connected to a suction pipe 8 described later. An outlet pipe 61 of the evaporator 6 is connected to an upper part of the accumulator 7.
In addition, one end of a suction pipe 8 to be described later is inserted upward into the lower part of the accumulator 7, and two oil return holes 10 are formed in the side wall of one end 71 of the inserted pipe.
a and 10b are formed. The oil return holes are vertically arranged such that the distance from the upper end 71a of one end 71 of the inserted pipe is different from each other. The suction pipe 8 is connected between the accumulator 7 and the suction port of the compressor 1, and is a pipe for counterflow heat exchange with the capillary tube 5. A check valve 9 is inserted into the outlet of the suction pipe 8. The check valve 9 prevents the refrigerant and the lubricating oil from flowing backward from the suction port side of the compressor 1 to the low-pressure side of the evaporator 6, the accumulator 7, and the suction pipe 8 when the compressor 1 is stopped. It is for.

In the above configuration, in the refrigeration cycle apparatus of the present embodiment, the refrigerant discharged from the compressor 1 is cooled by the cooler 2 and then passes through the pipe 3 inside the compressor 1 again. The refrigerant circulates through the condenser 4, the capillary tube 5, the evaporator 6, the accumulator 7 provided at the outlet of the evaporator 6, the suction pipe 8, and the like, and returns to the compressor 1.

In addition, this refrigeration cycle apparatus has an R32
/ R125 / R134a three-component mixed refrigerant
The compressor 1 is filled with a lubricating oil in which a mixed oil of a mineral oil and an alkylbenzene-based oil and a small amount of hydrocarbons are mixed to improve the compatibility with the mixed refrigerant. In addition, R32 / R125 /
The disadvantage of the R134a mixed refrigerant can be solved by efficiently cooling the discharged refrigerant by the cooler 2 and the refrigerant cooling pipe 3 in the compressor.

The capillary tube 5 and the suction pipe 8 extending from the accumulator 7 at the outlet of the evaporator 6 to the compressor 1 are subjected to counter-flow heat exchange, and are R32 / R125 / R134.
By utilizing the characteristic that the three-component mixed refrigerant consisting of a is a non-azeotropic mixed refrigerant, even when the refrigerant is not evaporated at the outlet of the evaporator 6, heat is effectively exchanged with the capillary tube 5, and the capillary tube 5 Since the refrigerant flowing inside is cooled while performing the depressurizing action, the dryness of the refrigerant at the inlet of the evaporator 6 is reduced, the evaporation capacity in the evaporator 6 is increased, and a further improvement in the coefficient of performance (COP) can be expected. Things.

Further, even when the contact temperature at the tip of the vane (not shown) rises, for example, when a rotary compressor is used as the compressor 1, mineral oil, alkylbenzene-based oil, and lubricating oil for the compressor 1 can be used. Since these mixed oils and lubricating oils in which a small amount of hydrocarbons are mixed in order to improve compatibility are used, hydrolysis does not occur unlike the ester-based oils. In this case, R32 / R125 / R134a
In the accumulator 7 at the outlet of the evaporator 6, the upper layer mainly composed of the lubricating oil, the intermediate layer composed of the intermediate lubricating oil and the refrigerant, The lubricating oil and the refrigerant once stored in the accumulator 7 are easily separated into a lower layer mainly composed of the refrigerant, and even if the lubricating oil and the refrigerant are separated into a layer mainly composed of the lubricating oil and the refrigerant mainly, The pipe connected below the accumulator 7 has a plurality of oil return holes 10a, 10
Since b is provided, the lubricating oil can be reliably returned to the compressor 1.

Further, only fluorinated hydrocarbons (HFCs)
Of refrigerant consisting of mineral oil and alkylbenzene oil
As hydrocarbons mixed in small amounts to improve solubility
Alkane-based saturated hydrocarbons are desirable for thermal stability
The leakage of hydrocarbons during operation of the refrigeration cycle
To avoid flammability hazards due to large refrigerators, automatic
Average condensing temperature of refrigeration cycle equipment such as vending machines
Hydrocarbons having a boiling point of + 45 ° C. or higher are desirable. this
Alkane-based saturated carbon with a boiling point of + 45 ° C or higher
Hydrogens include n-hexane (C₆H₁₄, Boiling point: +6
9 ° C), 2-methylpentane (C₆H₁₄, Boiling point: +60
C), 3-methylpentane (C₆H₁₄, Boiling point: +63
° C), 2,2-dimethylbutane (C₆H₁₄, Boiling point: +50
° C), 2,3-dimethylbutane (C₆H₁₄, Boiling point: +58
° C), n-heptane (C₇H₁₆, Boiling point: + 98 ° C), 2-
Methylhexane (C₇H₁₆, Boiling point: + 90 ° C), 3-methyl
Hexane (C ₇H₁₆, Boiling point: + 92 ° C), 2,2-dimethyl
Chilpentane (C₇H₁₆, Boiling point: + 79 ° C), 2,3-di
Methylpentane (C₇H₁₆, Boiling point: + 90 ° C), 2,4-
Dimethylpentane (C₇H₁₆, Boiling point: + 80 ° C), 3,3
-Dimethylpentane (C₇H₁₆, Boiling point: + 86 ° C), 3-
Ethyl pentane (C₇H₁₆, Boiling point: + 93 ° C), 2, 2,
3-trimethylbutane (C₇H₁₆, Boiling point: + 81 ° C), n
-Octane (C₈H₁₈, Boiling point: + 126 ° C), n-nonane
(C₉H₂₀, Boiling point: + 151 ° C), n-decane (C_TenH_{twenty two},
Boiling point: + 174 ° C), n-undecane (C₁₁H_{twenty four},boiling point:
+ 196 ° C).

(Embodiment 3) Next, another embodiment of a refrigeration cycle apparatus using a ternary mixed refrigerant according to the present invention will be described with reference to FIG. Here, the configuration and operation of an embodiment in which the above-described three-component mixed refrigerant is applied to a refrigeration cycle device such as a vending machine having a plurality of evaporators will be described.

In the refrigeration cycle apparatus shown in FIG.
The same components as those in the first embodiment are denoted by the same reference numerals. In the present embodiment, the difference from FIG. 1 is that the refrigerant discharged from the compressor 1 is cooled by a cooler 2 formed integrally with a condenser 4 and then re-compressed.
The compressor 1 is a high pressure shell type rotary compressor which is returned to the inside, and the returned refrigerant is the compressor 1
In the high pressure shell.

Here, the compressor 1 of the present embodiment will be further described. That is, as shown in FIG.
Has a compression cylinder 102 inside the high-pressure shell 101 for compressing the refrigerant, and the compression cylinder 1
In this configuration, the refrigerant compressed in 02 is directly discharged from the compression cylinder 102 to the outside of the high-pressure shell 101. Therefore, unlike the above embodiment, the refrigerant cooled by the cooler 2 is once opened in the high pressure shell 101 of the compressor 1, discharged again from the high pressure shell 101 to the outside, and sent to the condenser 4. Things. A state in which the return refrigerant 200b returned from the cooler 2 is present inside the high-pressure shell 101 of the compressor 1 shown in FIG.

In this way, the refrigerant discharged from the compressor 1 again passes through the condenser 4 and passes through the distributor 1
In FIG. 1, the refrigerant circuit is branched into a plurality of refrigerant circuits, and the plurality of branched refrigerant circuits are provided with solenoid valves 12a, 12b, and 12c. A plurality of refrigerant circuits after the solenoid valves 12a, 12b, 12c have capillary tubes 5a, 5a,
b, 5c and the evaporators 6a, 6b, 6c are connected, and the refrigerant circuit that has exited the evaporators 6a, 6b, 6c is connected to the suction pipes 8a, 8
b and 8c are joined at the accumulator 7 and further returned to the compressor 1 via the check valve 9 and the like.

In the present embodiment shown in FIG. 2, the arrangement of the accumulator 7 and the configuration of the piping are different from those in the embodiment shown in FIG. Suction pipes 8a, 8b, 8
c and countercurrent heat exchange.

Here, the accumulator 7 of this embodiment will be further described.

As shown in FIG. 2, a pipe on the suction port side of the compressor 1 is connected to the upper part of the accumulator 7.
In addition, one end of the evaporator 6 is located below the accumulator 7.
suction pipes 8a, 8 connected to the respective outlets of a, 6b, 6c
The other ends of b and 8c are inserted upward, respectively, and two oil return holes 10a and 10b are formed in the side walls of the three inserted pipes 72, 73 and 74, respectively. , The oil return holes are provided at the uppermost ends 72a, 73a. They are arranged in the vertical direction so that the distances from 74a are different from each other. A check valve 9 is connected between the upper part of the accumulator 7 and the suction port side of the compressor 1, and has the same function as that described in the first embodiment.

Each of the evaporators 6a, 6b, 6c is disposed in a load chamber to be cooled, and by controlling the temperature of each load chamber, the electromagnetic valves 12a, 12a, 12
The opening and closing of b and 12c are controlled.

The refrigeration cycle apparatus has an R32
/ R125 / R134a three-component mixed refrigerant
The compressor 1 is filled with a lubricating oil in which a mixed oil of a mineral oil and an alkylbenzene-based oil and a small amount of hydrocarbons are mixed to improve the compatibility with the mixed refrigerant. In addition, the discharge temperature is increased by R32
The drawbacks of the / R125 / R134a mixed refrigerant are that the structure of the cooler 2 for efficiently cooling the discharged refrigerant and the cooler 2
Once returned to the high-pressure shell 101,
The compression cylinder 102 can also be eliminated by the configuration of cooling.

Also, by utilizing the characteristic that the three-component mixed refrigerant consisting of R32 / R125 / R134a is a non-azeotropic mixed refrigerant, even when the refrigerant is not evaporated at the outlets of the evaporators 6a, 6b and 6c, the capillary tube can be used. 5a, 5b, 5c are effectively exchanged with heat, and the capillary tubes 5a, 5b, 5c
Since the refrigerant flowing inside c is cooled while performing the depressurizing action, the dryness of the refrigerant at the inlets of the evaporators 6a, 6b, 6c is reduced, and the evaporation capacity in each of the evaporators 6a, 6b, 6c is increased. An improvement in the coefficient of performance (COP) can be expected. Further, in the accumulator 7 joined at the outlets of the evaporators 6a, 6b, and 6c, it is easy to be separated into an upper layer mainly composed of a lubricant, a mixed layer of intermediate lubricant and a refrigerant, and a lower layer mainly composed of a refrigerant, Since a plurality of oil return holes 10a, 10b are provided in the pipes 72, 73, 74 inserted into the accumulator 7 from the lower part, the lubricating oil and the refrigerant once stored in the accumulator 7 are again returned to each evaporator. 6
The lubricating oil can be reliably returned to the compressor 1 together with the refrigerant which is returned to the outlet pipes a to 6c and flows back from each evaporator at high speed. In the case where the accumulator 7 is connected to a position closer to the compressor than the evaporator, the configuration of the above-described pipe connection of the accumulator 7 is preferably performed as in the present embodiment, as described in the first embodiment. This is advantageous in that the possibility that the refrigerant returns to the compressor 1 in a liquid state is smaller than that in the case of performing the above operation.

As described above, in the above embodiment, R32 /
Using a three-component mixed refrigerant consisting of R125 / R134a,
A refrigeration cycle device in which a compressor, a cooler that temporarily cools the refrigerant discharged from the compressor, a condenser, a throttle device such as one or more capillary tubes and an expansion valve, a single or multiple evaporators, and an accumulator are connected by piping. Is provided.

R32 / R125 / R134 used
The three-component mixed refrigerant consisting of a, R32 near 20 to 30% by weight, R125 near 15 to 25% by weight,
It contains R134a in the vicinity of 60% by weight.

When a capillary tube is used as the decompression device, heat is exchanged between the capillary tube and the suction pipe connecting the evaporator / compressor in a counterflow manner.

Further, a plurality of oil return holes are provided in the accumulator in the vertical direction, and mineral oil or alkylbenzene-based oil as a lubricating oil for a compressor, and a mixed oil thereof or a small amount of hydrocarbons for improving compatibility. Using a lubricating oil mixed with the same. In addition, as the hydrocarbons mixed to improve the compatibility, alkane-based saturated hydrocarbons having a boiling point of + 45 ° C. or more are used.

As is apparent from the above description, the present invention provides the R32 / R125 conventionally proposed as an alternative to the R22.
/ R134a three-component mixed refrigerant, large refrigerator,
In applying to a refrigeration cycle device such as a vending machine, the refrigerant discharged from the compressor is once cooled by a cooler, thereby eliminating problems such as a rise in discharge temperature,
An object of the present invention is to provide a refrigeration cycle apparatus that has a reduced influence on global warming by reducing GWP and improving the coefficient of performance (COP). When a capillary tube is used as the decompression device, the suction tube connecting the capillary tube and the evaporator / compressor is subjected to counterflow heat exchange, and the three-component mixed refrigerant composed of R32 / R125 / R134a is a non-azeotropic mixed refrigerant. Utilizing a certain feature, the evaporation capacity of the evaporator is increased, and a further improvement in the coefficient of performance (COP) can be expected.

Further, in the present invention, since a plurality of oil return holes are provided in the accumulator in the vertical direction, the lubricating oil can be reliably returned to the compressor. As the lubricating oil for the compressor, mineral oil, alkylbenzene oil, And a mixture of these oils and a lubricating oil mixed with a small amount of hydrocarbons to improve the compatibility. The hydrocarbons mixed to improve the compatibility include alkane-based compounds having a boiling point of + 45 ° C. or more. Are preferred.

In the above embodiment, the case where a mixture of a mixed oil of a mineral oil and an alkylbenzene-based oil and hydrocarbons for improving compatibility with a refrigerant is used as a lubricant for a compressor. Was explained, but not limited to this, for example,
(1) Mineral oil, alkylbenzene-based oil, or a mixed oil thereof may be used as a lubricant for a compressor, or
(2) A mixture of a mineral oil, an alkylbenzene-based oil, or a mixed oil thereof and a hydrocarbon may be used as the lubricating oil for the compressor.

In the above embodiment, the high-pressure shell 10
In the case where the discharge refrigerant 200a is discharged into the inside 1, the case where the refrigerant cooling pipe 3 in the compressor is disposed in the high-pressure shell 101 has been described. However, the present invention is not limited to this, and, for example, the pipe 3 contacts the outside of the high-pressure shell 101. It is good also as a structure wound around. Also in this case, the refrigerant discharged in the high-pressure shell can be cooled.

Further, in the above embodiment, the case where the piping configuration of the accumulator is changed as follows according to the case where the mounting position of the accumulator is closer to the evaporator and the case where the mounting position is closer to the compressor is described. That is, in the case of the former mounting position, one end of the pipe connected to the suction port side of the compressor is configured to be inserted upward from the lower side of the accumulator, and in the case of the latter mounting position, One end of a pipe connected to the outlet side of the evaporator was inserted upward from the lower side of the accumulator. However, the invention is not limited to this.
Combination with two mounting positions of accumulator,
Of course, a combination opposite to the above combination may be used.

[0061]

As is apparent from the above description, the present invention provides a refrigeration cycle apparatus having R32, R125 and R13.
Even when a three-component mixed refrigerant containing 4a is used, there is an advantage that the discharge temperature can be lowered as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a piping configuration diagram in which a three-component mixed refrigerant is applied to a refrigeration cycle apparatus having a single evaporator according to an embodiment of the present invention.

FIG. 2 is a piping configuration diagram in which a ternary mixed refrigerant is applied to a refrigeration cycle apparatus having a plurality of evaporators according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Cooler 3 Refrigerant cooling pipe in a compressor 4 Condenser 5, 5a-5c Capillary tube 6, 6a-6c Evaporator 7 Accumulator 8, 8a-8c Suction pipe 9 Check valve 10a, 10b Oil return hole 11 Distri Viewer 12a-12c Solenoid valve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location F25B 43/02 F25B 43/02 J // C09K 5/04 ZAB C09K 5/04 ZAB C10N 40:30 (72) Inventor Noriho Okaza 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Akihiro Jino 4-5-2, Takaidahondori, Higashi Osaka City, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. ) Inventor Yoshifumi Seiji 4-2-5 Takaida Hondori, Higashi Osaka City, Osaka Prefecture Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Inventor Takahiro Inoue 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigeration Co., Ltd.

Claims (11)

[Claims] 1. A compressor, and R32, R125, and R13 discharged from the compressor.
A condenser that cools the three-component mixed refrigerant including 4a; a condenser that condenses the cooled refrigerant; and a throttle device that has one or more capillary tubes or expansion valves that decompresses the condensed refrigerant. One or more evaporators for evaporating the decompressed refrigerant, and an accumulator connected between the evaporator and the compressor are connected by piping to a three-component mixed refrigerant. Refrigeration cycle equipment. 2. The ternary mixed refrigerant is substantially 20 to 3
0% by weight of R32 and substantially 15 to 25% by weight of R12
5. The refrigeration cycle apparatus using a ternary mixed refrigerant according to claim 1, wherein the refrigeration cycle apparatus contains 5 and substantially 50 to 60% by weight of R134a. 3. When the capillary tube is used as the expansion device, the capillary tube and a pipe connected between the evaporator and the compressor are subjected to counter-flow heat exchange. Item 3. A refrigeration cycle apparatus using the three-component mixed refrigerant according to Item 1. 4. An upper part of the accumulator is connected to a pipe on an outlet side of the evaporator, and a lower part of the accumulator is connected to a pipe having one end connected to a suction port side of the compressor. The other end is inserted substantially upward, and a plurality of oil return holes are formed in a side wall portion of the inserted one end, and the oil return holes are located at a distance from the uppermost end of the inserted one end. The refrigeration cycle apparatus using a three-component mixed refrigerant according to claim 1, wherein 5. A pipe connected to a suction port side of the compressor at an upper part of the accumulator, and a pipe connected at one end to an outlet pipe side of the evaporator at a lower part of the accumulator. The other end is inserted substantially upward, a plurality of oil return holes are formed in the side wall of the inserted one end, and these oil return holes are formed from the uppermost end of the inserted one end. The refrigeration cycle apparatus using a three-component mixed refrigerant according to claim 1, wherein the distances are different from each other. 6. A compressor lubricating oil comprising a mineral oil, an alkylbenzene-based oil, or a mixed oil thereof, or a mixture of said mineral oil, an alkylbenzene-based oil, or a mixed oil thereof, and hydrocarbons. The refrigeration cycle apparatus using the three-component mixed refrigerant according to claim 1, wherein: 7. The hydrocarbons are for improving the compatibility between the refrigerant and the lubricating oil, and are alkane-based saturated hydrocarbons having a boiling point of + 45 ° C. or higher. A refrigeration cycle apparatus using the three-component mixed refrigerant according to claim 6. 8. The compressor has a compression cylinder inside the high-pressure shell for compressing the refrigerant, and discharges the refrigerant compressed in the compression cylinder into the high-pressure shell, and then releases the high-pressure shell. The refrigerant is cooled by the cooler, and the refrigerant is sent to the condenser once through a pipe arranged in the high-pressure shell. A refrigeration cycle device using a three-component mixed refrigerant. 9. The compressor has a compression cylinder inside the high-pressure shell for compressing the refrigerant, and discharges the refrigerant compressed in the compression cylinder from the compression cylinder directly to the outside of the high-pressure shell. The refrigerant cooled by the cooler is opened once in a high-pressure shell of the compressor, discharged again from the high-pressure shell to the outside, and sent to the condenser. Item 3. A refrigeration cycle apparatus using the three-component mixed refrigerant according to Item 1. 10. A plurality of refrigerant circuits including the capillary tube or the expansion valve and the evaporator, and a distributor provided at an outlet of the condenser for diverting the refrigerant to each of the plurality of refrigerant circuits. The refrigeration cycle apparatus using a three-component mixed refrigerant according to claim 1, further comprising: a viewer; and a plurality of solenoid valves connected to each of the plurality of refrigerant circuits. 11. An evaporator provided in each of the plurality of refrigerant circuits is arranged in a separate load chamber, and controls opening and closing of the plurality of solenoid valves based on temperature control of each of the load chambers. A refrigeration cycle apparatus using the three-component mixed refrigerant according to claim 10.