JPH0777364A - Freezer - Google Patents

Abstract

PURPOSE:To provide a freezer in which refrigerant and a freezer oil having no compatibility with the refrigerant are used, and which can easily be manufactured to maintain a low price. CONSTITUTION:In a freezer system in which refrigerant of HFC-134a and freezer oil composed of alkylbenzene and naphthene mineral oil having no compatibility with the refrigerant are enclosed in correspondence with full elimination of CFC, the refrigerant and oil are mixed to each other and the mixture substance enters from a capillary tube 53 into an upper part 60 of an evaporator coil. The refrigerant evaporates and the evaporated refrigerant and oil are moved downward in sequence and reach the lowest point 61 of the evaporator coil. Accordingly, alkylbenzene, and naphthene mineral oil not compatible with the refrigerant can be used without any shortage of oil in a compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating device used in an electric refrigerator or the like.

[0002]

2. Description of the Related Art In a meeting on the revision of the "Montreal Protocol on Ozone Depleting Substances" of the Ozone Layer Conservation Treaty, the 1996 abolition of chlorofluorocarbons (CFCs) was agreed. 25 years since 1994 compared to 1986
Regulations are becoming more and more spurred, with a significant reduction to less than%. Research and development to deal with the abolition of CFCs have been actively carried out by refrigerant manufacturers, refrigerator manufacturers, and oil manufacturers for four to five years, and the technology for substitution has almost reached the completion area. An example of the conventional refrigeration system described above will be described below with reference to the drawings.

FIG. 3 shows a refrigerating apparatus disclosed in Japanese Unexamined Patent Publication No. 4-183788. In the refrigerating cycle 46 shown in the figure, a refrigerant containing chlorine-free fluorocarbon-based refrigerant as a main component, for example, HFC. -134a and a refrigerating machine oil containing an ester oil compatible with the refrigerant as a base oil are enclosed.

FIG. 4 is also shown in Japanese Unexamined Patent Publication No. 4-183788, in which the horizontal axis represents the actual viscosity of the refrigerating machine oil stored in the rotary compressor, and the vertical axis represents the coefficient of performance of the compressor (displayed as a relative value. ), The encapsulated ester oil has a viscosity of 5 to 56 cSt at 40 ° C., and the alkylbenzene oil (SUNISO Z-300A) when CFC 12 is used, the actual viscosity of the refrigerator oil and the coefficient of performance (COP). It represents the relationship of. According to this, Freon 12 and 40
When Z-300A (alkylbenzene oil) having a viscosity of 56 cSt at 0 ° C. is set to 1.0 and the relative comparison is made,
The ester oil having a viscosity of 56.6 cSt at 40 ° C. is 0.
906 shows a good result.

As described above, the combination of the HFC-134a refrigerant and the ester oil compatible with the HFC-134a has almost reached the completion range, and the coefficient of performance indicates that the target is achieved.

FIG. 5 is an explanatory view of the layout of a conventional evaporator.
In FIG. 5, the refrigerant and the refrigerating machine oil sealed in the refrigeration cycle mix with each other and enter the upper part 21 of the evaporator from the capillary tube 20 which is the expansion mechanism.

Here, the refrigerant evaporates, and the refrigerant and the oil mixed therewith sequentially move downward to reach the lowest point 22 of the evaporator, and then sequentially move upward, and the terminal end 23 moves upward. positioned. The terminal 23 enters the accumulator 24, the suction pipe 25, and then the refrigerant compressor.

CF enclosed in a conventional refrigeration cycle
Since the refrigerant of C-134a and the ester oil have good compatibility with each other, they are well melted, so that the oil does not accumulate at the lowest point 22 of the evaporator coil.

[0009]

However, in the above-mentioned constitution, the ester is remarkably inferior in hydrolysis stability and hygroscopicity, so that a special capital investment is required to remove water. Esters are 3 to 4 times more expensive than naphthene mineral oil and alkylbenzenes.

When the ester is used, the capillary tube of the refrigeration system tends to be clogged with pollutants, and in order to prevent the contaminants, the refrigeration cycle components must be washed by a special method, which is costly.

In view of the above problems, the present invention uses the HFC-134a refrigerant in response to the total abolition of CFCs, and, unlike the conventional method, uses alkylbenzene and naphthene mineral oil, which are incompatible with the refrigerant, and is incompatible. The refrigeration system is easy to manufacture and can be maintained at a low price by devising a solution to the problems.

[0012]

In order to solve the above problems, the refrigerating apparatus of the present invention comprises a refrigerant compressor, a condenser, an expansion mechanism, and an evaporator to form a series of refrigerant flow paths. H
Refrigerant compressor, condenser, expansion mechanism in a refrigerating apparatus characterized in that a refrigerant containing a fluorocarbon-based compound containing no chlorine such as FC-134a as a main component and a refrigerating machine oil incompatible with the refrigerant are enclosed. , A refrigerant having an evaporator to form a series of refrigerant channels, a refrigerant containing a fluorocarbon-based compound containing no chlorine as a main component, and a refrigerating machine oil containing an alkylbenzene or naphthene mineral oil which is incompatible with the refrigerant as a main component The expansion mechanism is connected above the evaporator and the refrigerant and the oil mixed with the refrigerant are discharged to sequentially guide the refrigerant and the oil from the upper side to the lower side of the evaporator, and the evaporator from the lower side of the evaporator. It has a configuration in which it is connected by piping to a refrigerant compressor arranged below.

[0013]

The present invention has the above-described structure and is capable of producing HFC-134a.
Coil above the evaporator from the capillary tube that is the expansion mechanism in the state where the refrigerant mainly containing a fluorocarbon compound that does not contain equal chlorine and the alkylbenzene or naphthene mineral oil that is incompatible with the refrigerant and the oil are mixed. Is discharged inside. In the coil of the evaporator, the refrigerant and the oil move sequentially from the upper side to the lower side. There is no part that goes down from the top and goes up again like a conventional evaporator, so oil does not accumulate.

Therefore, the refrigerant evaporates and takes heat from the surroundings, and the oil that is incompatible with the refrigerant falls downward due to gravity. The oil reaching the lower side of the evaporator in this way falls by gravity to the refrigerant compressor disposed further below the position and accumulates in the refrigerant compressor at the lowest point. In this way, even if the refrigerant and the oil are not compatible with each other, the oil return to the refrigerant compressor is achieved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigeration system according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the conventional example will be described using the same reference numerals, and the same parts of the configuration and the operation will be omitted.

In FIG. 1, the HFC is installed inside the refrigeration system 50.
Refrigerant compressor 51 and condenser 52, expansion mechanism 53, evaporator 54, and -134a refrigerant, and alkylbenzene or naphthene mineral oil, which is refrigerating machine oil that is not compatible with this refrigerant, are enclosed.
The dryer 55 and the suction pipe 56 form a series of refrigerant flow paths.

As for the positional relationship among the respective components, a refrigerant compressor 51 is arranged below the evaporator 54, and is connected to the evaporator 54 downward by a suction pipe 56.

FIG. 5 is a diagram showing the layout of a conventional evaporator.
In FIG. 5, the refrigerant and the refrigerating machine oil sealed in the refrigeration cycle mix with each other and enter the upper part 21 of the evaporator from the capillary tube 20 which is the expansion mechanism.

Here, the refrigerant evaporates, and the refrigerant and the oil mixed therewith sequentially move downward to reach the lowest point 22 of the evaporator, and then sequentially move upward, and the terminal end 23 goes upward. positioned. The terminal 23 enters the accumulator 24, the suction pipe 25, and then the refrigerant compressor.

CF enclosed in a conventional refrigeration cycle
Since the refrigerant of C-134a and the ester oil have good compatibility with each other, they are well melted, so that the oil does not accumulate at the lowest point 22 of the evaporator coil.

FIG. 2 is an illustration of the layout of the evaporator, in which the refrigeration cycle is filled with HFC-134a refrigerant and alkynebenzene or naphthene mineral oil which is incompatible with this refrigerant. The refrigerant and the refrigerating machine oil are incompatible with each other, but they are mixed with each other and enter the upper portion 60 of the evaporator through the capillary tube 53.
Here, the refrigerant evaporates, and the refrigerant and the oil mixed therewith sequentially move downward and reach the lowest point 61 of the evaporator. Next, it returns from the suction pipe 56 disposed below this position to the refrigerant compressor at the lowest position through the accumulator 62.

Therefore, even if the refrigerating machine oil is not compatible with the refrigerant, the refrigerating machine oil returns to the refrigerant compressor 51 because there is no space for the refrigerating machine oil to stay in the refrigeration cycle. This means that the problem that the refrigerating machine oil stays in the low-temperature evaporator and causes the compressor to run out of oil will be eliminated, and even if the refrigerating machine oil and the refrigerating machine oil are incompatible, the refrigerator can be used without any problems, No special capital investment is required by using the ester, and cheap refrigerating machine oil can be used, so it is possible to provide a refrigerating apparatus that maintains a low price.

[0023]

As described above, the present invention is provided with a refrigerant compressor, a condenser, an expansion mechanism, and an evaporator to form a series of refrigerant passages, and is a fluorocarbon system such as HFC-134a containing no chlorine. A refrigerant compressor, characterized in that a refrigerant containing a compound as a main component and a refrigerating machine oil that is incompatible with the refrigerant are enclosed.
A refrigerant having a condenser, an expansion mechanism and an evaporator to form a series of refrigerant passages, which mainly contains a fluorocarbon-based compound containing no chlorine and an alkylbenzene or naphthene mineral oil which is incompatible with the refrigerant are mainly used. Refrigerant and oil are sequentially introduced from the upper side to the lower side of the evaporator coil by sealing the refrigerator oil as a component and connecting the expansion mechanism to the coil above the evaporator to discharge the oil mixed with the refrigerant, A pipe was connected from below the evaporator coil to a refrigerant compressor arranged below the evaporator.

According to the present invention, the HFC-13 having the above-mentioned configuration is used.
4a Refrigerant and alkylbenzene or naphthene mineral oil which is incompatible with the refrigerant are discharged from the capillary tube which is the expansion mechanism into the upper coil of the evaporator in a state where the refrigerant and the oil are mixed. In the evaporator coil, the refrigerant and the oil move sequentially from the top to the bottom. There is no part that goes down from the top and goes up again like a conventional evaporator, so oil does not accumulate.

Therefore, the refrigerant evaporates, takes heat from the surroundings, and the oil that is incompatible with the refrigerant falls downward due to gravity. The oil thus reaching the lower side of the evaporator coil falls by gravity to the refrigerant compressor disposed below the position of the evaporator coil and accumulates in the refrigerant compressor at the lowest point. In this way, even if the refrigerant and the oil are not compatible with each other, the oil can be returned to the refrigerant compressor, so that the following effects can be obtained. 1. When the refrigerating machine oil of claim 2 is alkylbenzene, no special equipment is required to remove water, and the cost is lower than that of ester oil. Also, there is no need to clean the refrigeration cycle components by a special method. 2. When the refrigerating machine oil according to claim 2 is naphthene mineral oil, the viscosity of the mineral oil is lower than that of the above-mentioned synthetic alkylbenzene, which is incompatible with HFC-134a (for example, Suniso IGS manufactured by Nippon San Oil Co., Ltd., kinematic viscosity (cS).
t) is 1 at 40 ° C according to the test method of JISK2283.
1.0-13.0 cSt. 2.60-3.1 at 100 ° C
0 cSt of mineral oil] does not cause a change in its viscosity in the refrigeration system due to compatibility with the refrigerant, that is, it is not affected by the change in oil viscosity, and energy efficiency (EE
R) or the coefficient of performance (COP) is small, and the energy-saving stable refrigeration system is provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a refrigerating apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view of the arrangement of the evaporator coil shown in FIG.

FIG. 3 is a refrigeration cycle diagram of a conventional refrigeration system.

FIG. 4 is a diagram showing the relationship between the actual viscosity of the refrigerator and the coefficient of performance during the rated operation of the conventional rotary compressor.

FIG. 5 is an explanatory view of coil arrangement of a conventional evaporator.

[Explanation of symbols]

 50 Refrigerator 51 Refrigerant Compressor 52 Condenser 53 Expansion Mechanism 54 Evaporator 56 Piping 60 Above Evaporator Coil 61 Bottom Point of Evaporator Coil

Claims (2)

[Claims] 1. A refrigerant comprising a refrigerant compressor, a condenser, an expansion mechanism, and an evaporator to form a series of refrigerant passages and containing a fluorocarbon-based compound containing no chlorine as a main component, and the refrigerant. A refrigeration system characterized by enclosing a refrigerating machine oil that is incompatible. 2. A refrigerant comprising a refrigerant compressor, a condenser, an expansion mechanism, and an evaporator to form a series of refrigerant passages and containing a fluorocarbon-based compound containing no chlorine as a main component, and the refrigerant. Refrigerating machine oil mainly composed of incompatible alkylbenzene or naphthene mineral oil is enclosed, and the expansion mechanism is connected to the upper side of the evaporator to discharge the refrigerant and the oil mixed with the refrigerant and sequentially from the upper side to the lower side of the evaporator. A refrigerating device in which a refrigerant and oil are introduced and connected by piping from below the evaporator to a refrigerant compressor arranged below the evaporator.