JPH10103816A - Refrigerating device and closed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform stable operation for a long period even when ester refrigerator oil and an HFC refrigerant are used by a method wherein a water absorber having a desiccant placed therein is coupled to a compressor and during operation of a refrigerating device, a refrigerant and refrigerator oil are brought into contact with the desiccant in the water absorber to remove a moisture content. SOLUTION: A line 10 communicated with the internal part of a case is arranged in a closed case 7 of a closed compressor 1A. A water absorber 12 in which desiccant 11 is placed is arranged at the other end of the line 10 and a pressure reducing valve 13 and a check valve 14 are arranged in a line 10 running between the water absorber 12 and the closed case 7. A moisture content contained in air in the closed case 7 and a moisture content entering through penetration of it to the closed case 7 through a refrigerant outlet 9 in which a rubber plug is inserted are brought into contact with the desiccant 11 for removal. Further, during operation of the refrigerating device, the refrigerant and the refrigerator oil are brought into contact with the desiccant 11 in the water absorber 12 to remove a moisture content in a refrigerating circuit. This constitution prevents the generation of sludge, such as metallic soap, since hydrolysis of the refrigerator oil is not effected, and performs stable operation for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus and a hermetic compressor, and more particularly, to a refrigerating apparatus using an HFC-based refrigerant or the like which does not have a risk of destroying an ozone layer. TECHNICAL FIELD The present invention relates to a refrigeration apparatus and a hermetic compressor capable of preventing a capillary tube from being clogged by sludge or the like and enabling stable operation for a long period of time.

[0002]

2. Description of the Related Art Conventionally, refrigerants used for refrigerators include dichlorodifluoromethane (R-12) or an azeotropic mixed refrigerant R-22 and monochloropentafluoroethane (R-115a). 502 are many. These refrigerants are suitable for ordinary refrigeration equipment, and refrigeration cycles using refrigeration oils such as mineral oils and alkylbenzene-based oils compatible with the refrigerants have reached high quality levels such as reliability and durability.

[0003] However, the above-mentioned refrigerant has high ozone depletion, and when released into the atmosphere and reaches the ozone layer above the earth, the ozone layer is destroyed. This destruction of the ozone layer is caused by chlorine groups (Cl) in the refrigerant. Therefore, a refrigerant having a low chlorine group content, such as chlorodifluoromethane (HCFC-22, R-22), a refrigerant containing no chlorine group, such as difluoromethane (HFC-32,
R-32), pentafluoroethane (HFC-125,
R-125) and 1,1,1,2-tetrafluoroethane (HFC-134a, R-134a) are considered as these alternative refrigerants (hereinafter referred to as HFC-based refrigerants).

FIG. 3 shows an example of a conventional typical refrigeration circuit. 1 is a compressor, 2 is a condenser, 3 is a dryer, 4 is a capillary tube, 5 is an evaporator, and 6 is an accumulator. Arrows indicate the flow direction of the refrigerant. Refrigeration oils used for HFC-based refrigerants include mineral oils and alkylbenzene-based oils that are incompatible with HFC-based refrigerants, and HF.
There are ester refrigerating machine oils, ether refrigerating machine oils, and mixed oils thereof (hereinafter, referred to as ester refrigerating machine oils) that are compatible with the C-based refrigerant. However, when an ester-based refrigerating machine oil is used, when moisture is present in the refrigerating circuit, the refrigerating machine oil is hydrolyzed to generate an acid, and the generated acid forms sludge such as metal soap. The generated sludge flows into the capillary tube 4 and causes problems such as clogging the capillary tube 4, damaging the sliding portion of the compressor, increasing frictional resistance, and abrading. And it is not possible to operate stably for a long period of time.

[0005]

SUMMARY OF THE INVENTION A first object of the present invention is to use an ester type refrigerating machine oil as a refrigerating machine oil,
Even when FC-based refrigerants are used, water in the refrigeration circuit is removed to prevent sludge from forming, clogging the capillary tubes, damaging the sliding parts of the compressor, increasing frictional resistance, and causing wear. It is an object of the present invention to provide a refrigeration apparatus that can be operated stably for a long time by eliminating such a problem. The second object of the present invention is to reduce moisture in the internal air used in such a refrigeration apparatus. It is an object of the present invention to provide a hermetic compressor which has been removed.

[0006]

Means for Solving the Problems As a result of repeated studies to solve the above-mentioned problems, the present inventors have found that a water absorber containing a desiccant in a compressor case to remove moisture in the air inside the compressor case. Prepare a compressor installed in connection with, to manufacture a refrigeration device using this compressor, during operation of the refrigeration device contact the refrigerant and refrigerating machine oil with the desiccant in the water absorber The inventors have found that the above problem can be solved by removing water in the refrigeration circuit, and have completed the present invention.

A first aspect of the present invention is a condenser for condensing and liquefying a refrigerant, a capillary tube for adjusting the pressure of the refrigerant, an evaporator for evaporating the liquefied refrigerant, an accumulator, and a condenser for compressing the vaporized refrigerant. In a refrigerating apparatus provided with a compressor or the like that discharges water to a compressor, a pipe is connected to the inside of the case of the compressor, and a desiccant is added to the other end of the pipe to remove moisture in the refrigerating circuit. This is a refrigeration apparatus characterized by installing a water absorber.

According to a second aspect of the present invention, in the refrigeration apparatus according to the first aspect, a pressure reducing valve and a check valve are provided in the pipeline.

According to a third aspect of the present invention, in the refrigeration apparatus according to the first or second aspect, the desiccant is silica gel or molecular sieve.

According to a fourth aspect of the present invention, there is provided a hermetic compressor used in the refrigeration apparatus according to the first aspect, wherein a pipe line communicating with the inside of the compressor is provided in a case of the compressor.
A hermetic compressor characterized in that a water absorber containing a desiccant is installed at the other end of the pipe in order to remove moisture in the air in the compressor.

According to a fifth aspect of the present invention, in the hermetic compressor according to the fourth aspect, a pressure reducing valve and a check valve are provided in the pipeline.

According to a sixth aspect of the present invention, in the closed type compressor according to the fourth or fifth aspect, the desiccant is silica gel or molecular sieve.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a hermetic compressor 1A according to the present invention is driven by an electric element (motor) having a rotating shaft (not shown) on the upper side of a sealed case 7 and a rotating shaft of the motor on a lower side. A compression element (not shown) is accommodated, and the refrigerant sucked from the refrigerant inlet 8 is compressed by the compression element and discharged into the sealed case 7, and then discharged from the refrigerant outlet 9 out of the sealed case 7. I have.

A hermetic compressor 1A manufactured by housing the electric element (electric motor) and the compression element in a closed case 7.
Is filled with air, the refrigerant inlet 8 is usually pinched and closed, and the refrigerant outlet 9 is sealed with a rubber stopper and stored until it is incorporated into a refrigeration circuit.

The closed case 7 of the hermetic-type compressor 1A according to the present invention is provided with a pipe 10 communicating with the inside of the case, and the other end of the pipe 10 is provided with a water absorber 12 containing a desiccant 11 therein. I have. Pipe line 1 between water absorber 12 and sealed case 7
0 is provided with a pressure reducing valve 13 and a check valve 14. In FIG.
Part A is shown enlarged. The moisture contained in the air in the sealed case 7 and the water that enters the sealed case 7 through the rubber outlet 9 through the refrigerant outlet 9 by permeation or the like come into contact with the desiccant 11 and are removed. Can be kept dry.

FIG. 2 shows an example of a refrigeration circuit when the hermetic compressor 1A thus stored is used in a refrigeration system.
1A is a hermetic compressor, 2 is a condenser, 3 is a dryer, 4 is a capillary tube, 5 is an evaporator, and 6 is an accumulator. Arrows indicate the flow direction of the refrigerant. During operation of the refrigerating apparatus, the refrigerant and the refrigerating machine oil come into contact with the desiccant 11 in the water absorber 12, so that the water in the refrigerating circuit can be removed.

The pressure reducing valve 13 is used to reduce the pressure in the case where the pressure in the closed case 7 becomes high. The pressure reducing valve 13 receives a signal from a pressure sensor (not shown) even if it is manually adjusted. May be automatically adjusted so as to be activated when a predetermined value is exceeded by a signal from the control device. The check valve 14 is provided so that the air or the refrigerant in the closed case 7 enters the water absorber 12 to remove the water, but the desiccant 11 does not enter the closed case 7.

The dryer 3 is provided for removing moisture in the refrigeration circuit.
May be used, but the desiccant 11 in the water absorber 12 can remove the water in the refrigeration circuit, so that the dryer 3 may not be used. The desiccant 11 used in the present invention can be used as long as it can remove moisture contained in the air or the refrigerant in the closed case 7 and does not adversely affect the operation and performance. Not limited. As the desiccant 11, specifically, for example, silica gel, molecular sieve, or the like can be preferably used.

Even if an ester-based refrigerating machine oil, an ether-based refrigerating machine oil, or a mixture thereof is easily used as a refrigerating machine oil because there is no water in the refrigerating circuit,
Since the refrigerating machine oil is not hydrolyzed and sludge such as metal soap is not generated, problems such as clogging of the capillary tube 4 and damage to the sliding portion of the compressor 1A are eliminated.
It becomes possible to operate stably for a long time.

The water absorber 12 can be used while it is always attached, or it can be detached so that it can be used as needed. Preferably, the end of the pipe 10 is provided with a coupling or the like so that the water absorber 12 can be attached or detached at any time.

The type of the hermetic electric compressor of the present invention is not particularly limited, and specific examples thereof include a rotary compressor, a reciprocating compressor, a vibration compressor, a multi-vane rotary compressor, and a scroll compressor. And the like.

[0022]

The refrigerating apparatus of the present invention removes water in the refrigerating circuit even when a refrigerating machine oil such as an ester refrigerating machine oil or an ether refrigerating machine oil which is easily hydrolyzed or an HFC-based refrigerant is used. To prevent the generation of sludge and clog the capillary tube, damage the sliding part of the compressor, increase the frictional resistance, wear, etc.
It can be operated stably for a long time. The hermetic compressor of the present invention can remove moisture in the air in the case, and thus can be preferably used in the above-described refrigeration apparatus. The refrigeration apparatus and the hermetic compressor of the present invention are economical because they have a simple configuration, and are highly effective as described above and have high industrial utility value.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a hermetic compressor of the present invention.

FIG. 2 is an example of a refrigeration circuit of the refrigeration apparatus of the present invention.

FIG. 3 is a refrigeration circuit diagram of a commercially available refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Compressor 2 Condenser 3 Dryer 4 Capillary tube 5 Evaporator 6 Accumulator 7 Sealing case 8 Refrigerant inlet 9 Refrigerant outlet 10 Pipe line 11 Desiccant 12 Water absorber 13 Pressure reducing valve 14 Check valve

Claims (6)

[Claims] 1. A condenser for condensing and liquefying a refrigerant, a capillary tube for adjusting the pressure of the refrigerant, an evaporator for evaporating the liquefied refrigerant, an accumulator, and a compressor for compressing the vaporized refrigerant and discharging the refrigerant to the condenser. In the refrigeration apparatus, while installing a pipeline leading to the inside of the compressor case, and installing a water absorber containing a desiccant at the other end of the pipeline to remove moisture in the refrigeration circuit. Characterized refrigeration equipment. 2. The refrigeration system according to claim 1, wherein a pressure reducing valve and a check valve are provided in the pipeline. 3. The refrigerating apparatus according to claim 1, wherein the desiccant is silica gel or molecular sieve. 4. A hermetic compressor used in the refrigeration apparatus according to claim 1, wherein a pipe line communicating with an inside of a case of the compressor is provided, and moisture in air in the compressor is removed. A hermetic compressor characterized in that a water absorber containing a desiccant is installed at the other end of the pipe line. 5. The hermetic compressor according to claim 3, wherein a pressure reducing valve and a check valve are provided in the pipeline. 6. The hermetic compressor according to claim 4, wherein the desiccant is silica gel or molecular sieve.