JP4924239B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a vapor compression refrigeration cycle apparatus having an expander.

  Non-Patent Document 1 discloses a refrigeration cycle apparatus using a so-called separation type expander in which a expander is separated from a compressor in a vapor compression refrigeration cycle apparatus.

FIG. 5 is a configuration diagram showing a conventional refrigeration cycle apparatus described in Non-Patent Document 1. In FIG. 5, the refrigeration cycle apparatus 1 is configured by connecting a compressor 21, a radiator 16, an expander 22, and an evaporator 17 in this order. The refrigerant charged in the refrigeration cycle apparatus is compressed from low pressure to high temperature and high pressure in the compressor 21, is cooled to low temperature by exchanging heat with air and water in the radiator 16, and is expanded from high pressure to low temperature and low pressure in the expander 22. Then, heat is exchanged with water or air in the evaporator 17 and, after evaporation, is repeatedly compressed by the compressor 21. The expander 22 is connected to an expansion mechanism that converts the expansion energy of the refrigerant into a rotary motion and a generator, so that power can be recovered in the form of electric power and used as drive energy for the compressor. Efficiency can be improved.
Daikin / 2002 NEDO Results Report P.D. 5-37

  In general, a hermetic terminal used in a compressor provided in a small refrigerator is welded and fixed to a hermetic container while maintaining hermeticity. This state will be described with reference to FIG. FIG. 4 is a cross-sectional view showing a state where an airtight terminal of a conventional compressor is attached to a sealed container. In FIG. 4, since the pressure in the sealed container is usually higher than the atmospheric pressure, the airtight terminal 22a is inserted from the inside into the hole provided in the sealed container 22b as the mounting structure, and the hermetic terminal main body and the sealed container spread in a tapered shape. It is used by welding the inner end of the hole provided in the airtightly. Therefore, a fine gap 22c is formed outside the airtight terminal mounting hole cross section of the sealed container and the airtightly welded place of the airtight terminal main body, but the outer surface of the compressor is usually coated with excellent water resistance. Even if the fine gap is not sufficiently painted, the compressor is less likely to retain moisture in the fine gap due to its higher temperature than the surroundings, and it has been established as a general airtight terminal mounting structure. ing. The expansion terminal's airtight terminal is basically assumed to be installed in the same manner as the conventional compressor's airtight terminal, but the temperature of the expander is maintained at a low temperature in a refrigeration cycle apparatus equipped with a separate expander. For this reason, condensation may occur on the surface of the expander depending on the operating conditions, and moisture will remain in the minute gap outside the cross section of the airtight terminal mounting hole of the hermetic container and the airtight terminal main part of the airtight terminal. Even if a water-resistant coating is applied, there is a high possibility of rusting in a closed container in the situation where water droplets are always present.

  This invention is made | formed in view of this point, The place made into the objective is providing the refrigerating-cycle apparatus provided with the reliable expander which can prevent the rusting by the dew condensation of an airtight container.

In order to solve the above-mentioned conventional problems, the refrigeration cycle apparatus of the present invention is composed of a hermetic container for a compressor, which has a compression mechanism portion and an electric motor portion, and has an airtight terminal for transmitting electricity and is subjected to rust prevention coating. A compressor, a radiator for cooling the refrigerant compressed by the compressor, an expansion container and an airtight terminal for storing electricity and containing an expansion mechanism and a generator, and a sealed container for an expander having a rust-proof coating A refrigeration cycle apparatus having a configured expander, an evaporator for evaporating a refrigerant expanded by the expander, and a refrigerant pipe for circulating the refrigerant between the expander, an airtight terminal of the expander, and By applying a waterproof treatment to the joint of the expander sealed container, rusting due to condensation on the sealed container can be prevented.

  The refrigeration cycle apparatus according to the present invention is a separate type expander in which a compressor and an expander are housed in respective sealed containers. The refrigeration cycle apparatus is a highly efficient refrigeration cycle apparatus while preventing rusting due to dew condensation in the sealed container and ensuring reliability. Can be provided.

  1st invention accommodates the compressor compressed with the compressor comprised by the airtight terminal which accommodated the compression mechanism part and the motor part, and was equipped with the airtight terminal which transmits electricity, and gave antirust coating, and the said compressor An expander composed of a heatsink for cooling, an expansion mechanism section and a generator section, an airtight terminal for transmitting electricity, and a rust preventive coating hermetically sealed container for the expander, and expanded by the expander A refrigerating cycle apparatus having an evaporator for evaporating the refrigerant and a refrigerant pipe for circulating the refrigerant between them, and a waterproof treatment is applied to a portion in contact with the outside air at the joint between the hermetic terminal of the expander and the sealed container Even if the surface of the expander is condensed due to the application of moisture, it is possible to provide a highly reliable refrigeration cycle apparatus capable of preventing the occurrence of rust without moisture remaining in the minute gap between the secret terminal and the expander sealed container.

  In the second invention, in particular, the joint between the airtight terminal of the expander of the first invention and the hermetic container for the expander is hermetically welded from the outside, so that a minute gap between the expander container and the airtight terminal is removed from the external space. Since moisture can be shut off, even if condensation occurs on the surface of the expander, internal condensation can be prevented, and a highly reliable refrigeration cycle apparatus that can prevent rust can be provided.

  Even if the surface of the expander is condensed, for example, the third aspect of the present invention is the case where the surface of the expander is particularly condensed by filling the gap between the airtight terminal of the expander of the first invention and the sealed container for the expander with a resin-based waterproof filler. It is possible to provide a highly reliable refrigeration cycle apparatus capable of preventing the generation of rust without moisture remaining in the minute gap between the secret terminal and the expander sealed container.

  The fourth aspect of the invention is a change in the operating condition of the refrigeration system by filling the non-cured resin waterproof filler from the outside into the gap between the airtight terminal of the expander of the first aspect and the expander sealed container. Even if the pressure inside the expander sealed container fluctuates greatly, peeling of the filler can be prevented, and even if the expander surface is condensed, moisture does not stay in the minute gap between the confidential terminal and the expander sealed container. In addition, a highly reliable refrigeration cycle apparatus that can prevent the occurrence of rust can be provided.

  In the fifth invention, in particular, the refrigerant of any one of the first to fourth inventions is a high-pressure refrigerant, for example, carbon dioxide. As a result, high efficiency can be achieved even in equipment using carbon dioxide refrigerant, which has a large throttle loss in the expansion process compared to refrigeration air conditioners using chlorofluorocarbon as a refrigerant. A cycle device can be provided.

  In particular, the sixth invention uses the lubricating oil of the fifth invention mainly composed of polyalkylene glycol. As a result, since carbon dioxide and polyalkylene glycol have low compatibility, the liquid level of the lubricating oil in the hermetic container can be restrained from rising due to the refrigerant being melted, so the circulation rate of the lubricating oil during steady operation can be reduced. Can be small. As a result, since the performance of the radiator and the evaporator can be improved, a more efficient refrigeration cycle apparatus can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram showing a refrigeration cycle apparatus according to a first embodiment of the present invention. FIG. 2 is a view showing a detailed cross section of a joint portion between the hermetically sealed container and the airtight terminal portion of the expander in the first embodiment of the present invention. In FIG. 1, a compressor 21 composed of a compression mechanism portion 21e, an electric motor portion 21f, and a sealed container 21b, a radiator 16 for cooling the refrigerant compressed by the compressor 21, an expansion mechanism portion 22e and an electric motor portion 22f. The refrigerating cycle apparatus 1 includes an expander 22 composed of a closed container 22b, an evaporator 17 for evaporating the refrigerant expanded by the expander 22, and a refrigerant pipe 11 for circulating the refrigerant therebetween. . An airtight terminal 22a for taking out the electric power generated in the expander 22 is fixed to the expander sealed container 22b by welding. In FIG. 2, in order to withstand the internal pressure of the expander, the airtight terminal 22a is inserted from the inside into a fixing hole 22b1 provided in the expander hermetic container, and the internal angle 22b2 of the fixing hole and the airtight terminal main body skirt portion 22a1 are confidential. It is fixed while welding. The entire sealed container is rust-proofed. Further, the fixing hole external corner 22b3 and the airtight terminal main body portion of the expander hermetic container are fixed by welding.

(Embodiment 2)
FIG. 3 is a diagram showing a detailed cross section of the joint between the hermetically sealed container 22b and the airtight terminal portion 22a of the expander according to the second embodiment of the present invention. In FIG. 3, a minute gap 22c formed by the fixing hole 22b1 and the airtight terminal 22a of the hermetically sealed container of the expander is filled with a water resistant resin 22d.

  Since the microscopic gap 22c formed by the fixing hole 22b and the airtight terminal 22a of the expander hermetic container is filled with the non-curing resin-based water-resistant resin 22d, the pressure inside the expander hermetic container due to a change in the operating condition of the refrigeration system is increased. Even if it fluctuates, the peeling of the filler can be prevented, and even if the surface of the expander is condensed, moisture does not stay in the minute gap between the confidential terminal and the expander sealed container, and it is possible to prevent the occurrence of rust. A high refrigeration cycle apparatus can be provided.

  When the refrigerant is a high-pressure refrigerant, for example, carbon dioxide, the throttle loss in the expansion process is larger than that of a refrigeration air conditioner using Freon as the refrigerant. In this case, if this configuration that can be operated with increased reliability of the expander 22 is used, the efficiency of the equipment can be improved even if carbon dioxide refrigerant is used, so that the refrigeration cycle having high refrigeration efficiency without destroying the global environment. An apparatus can be provided.

  In addition, when a lubricating oil mainly composed of polyalkylene glycol is used as the lubricating oil, carbon dioxide and polyalkylene glycol have low compatibility, so the oil level of the lubricating oil in the sealed container increases due to the melting of the refrigerant. Therefore, the oil level change of the lubricating oil pool can be reduced depending on the operating conditions and pressure. Therefore, the total amount of the lubricating oil circulated outside the sealed container is increased by raising the oil level of the lubricating oil reservoirs 21d and 22d of both the compressor 21 and the expander 22, which is assumed in the case of a highly compatible lubricating oil. Thus, the problem of reducing the performance of the radiator 16 and the evaporator 17 can be avoided, so that a more efficient refrigeration cycle apparatus can be provided.

As described above, the refrigeration cycle apparatus according to the present invention includes a compressor composed of a hermetic container for a compressor having an airtight terminal that houses a compression mechanism portion and an electric motor portion and transmits electricity, and has been subjected to rust prevention coating, Expansion composed of a radiator for cooling the refrigerant compressed by the compressor, and an expansion container sealed with a rust-proof coating that has an airtight terminal that houses the expansion mechanism section and the generator section and conducts electricity A refrigeration cycle apparatus having an air conditioner, an evaporator for evaporating the refrigerant expanded by the expander, and a refrigerant pipe for circulating the refrigerant between them, wherein the airtight terminal of the expander and the sealed container are joined This is a refrigeration cycle apparatus characterized in that a waterproof treatment is applied to a portion that comes into contact with the outside air, thereby preventing condensation in a minute gap formed between the airtight terminal of the expander and the closed container of the expander Can be expensive It is possible to provide a refrigeration cycle device for securing a-reliability. Applicable to refrigeration cycle devices such as air conditioners, water heaters, car coolers. In addition, as a compressor and an expander, the vertical high pressure type scroll type has been described. However, a horizontal type compressor or expander in which the rotation axis is horizontal, or the pressure in the sealed container is the compressor suction side. The present invention can be similarly applied to a low-pressure compressor and an expander having the same pressure as the above. Further, the present invention can be similarly applied to various types such as a reciprocating type, a screw type, a vane rotary type, a rolling piston type, and a swing piston type as a compression mechanism or an expansion mechanism.

The block diagram which shows the refrigerating-cycle apparatus in Embodiment 1 of this invention. Sectional drawing of the junction part of the airtight terminal and closed container for expanders in Embodiment 1 of this invention Sectional drawing of junction part of the airtight terminal in Embodiment 2 of this invention, and the airtight container for expanders Sectional view of the joint between a conventional airtight terminal and a closed container for an expander Configuration diagram showing a conventional refrigeration cycle apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 11 Refrigerant piping 16 Radiator 17 Evaporator 21 Compressor 21a Compressor airtight terminal 21b Compressor sealed container 21e Compressor mechanism part 21f Compressor motor part 22 Expander 22a Expander airtight terminal 22a1 For expander Airtight terminal skirt portion 22a2 Airtight terminal for expander 22b Airtight container for expander 22b1 Airtight container fixing hole for expander 22b2 Internal angle of expander hermetic container fixing hole 22b3 External angle of expander airtight container fixing hole 22c Minute gap 22d Filler 22e Compressor mechanism 22f Compressor motor

Claims (3)

A compressor composed of a sealed container for a compressor that has an airtight terminal that houses electricity and conducts electricity, and that has been subjected to rust prevention coating, and heat dissipation for cooling the refrigerant compressed by the compressor , An expander composed of an expander hermetically sealed container having an airtight terminal for storing electricity and containing an expansion mechanism section and a generator section and provided with anticorrosion coating, and evaporating the refrigerant expanded by the expander And a refrigeration cycle apparatus having a refrigerant pipe that circulates a refrigerant between them, and a waterproof treatment is applied to a portion that comes into contact with the outside air at the joint between the hermetic terminal of the expander and the sealed container ,
A refrigeration cycle apparatus characterized in that an airtight terminal of the expander and a joint portion of the expander sealed container are airtightly welded from the outside . The refrigeration cycle apparatus according to claim 1, wherein the refrigerant is a high-pressure refrigerant, for example, carbon dioxide. The refrigeration cycle apparatus according to claim 1 or 2 , wherein a lubricating oil mainly composed of polyalkylene glycol is used as the lubricating oil.