Compressor for refrigeration and air-conditioning and refrigerating and air-conditioning apparatus

a compressor and refrigeration technology, applied in the direction of machines/engines, lighting and heating apparatus, positive displacement liquid engines, etc., can solve the problems of large amount of refrigerant dissolved in the compressor, high miscibility of compressor bearings, propane, propylene and fluoroethane each having a very high miscibility with the refrigerating machine oil, etc., to improve the performance of the compressor and the wear resistance thereof, improve the long-term reliability of the r

Inactive Publication Date: 2012-02-02
HITACHI APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]In accordance with the present invention, it is possible to obtain a compressor which has achieved both the improvement of the performances of the compressor and the wear resistance thereof without using a phosphorus-containing extreme pressure agent detrimental to environment as the additive of the refrigerating machine oil.
[0024]Further, in accordance with the present invention, it is possible to obtain an environmentally friendly refrigerating and air-conditioning apparatus capable of achieving both the improvement of performances and the long-term reliability of the refrigerating and air-conditioning apparatus without using the phosphorus-containing extreme pressure agent as the additive of the refrigerating machine oil.

Problems solved by technology

For this reason, in the case of the refrigerating machine oils, there remains a problem on the wear resistance in sliding parts such as compressor bearings.
Further, refrigerants such as HFO1234yf, HFO1234ze, propane, propylene and fluoroethane each have a very high miscibility with the refrigerating machine oils, and the amount of each refrigerant dissolved in the compressor is large.
This unfavorably causes reduction of the sealing property of the compression part, and further an increase in wear amount of the sliding part.

Method used

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  • Compressor for refrigeration and air-conditioning and refrigerating and air-conditioning apparatus
  • Compressor for refrigeration and air-conditioning and refrigerating and air-conditioning apparatus
  • Compressor for refrigeration and air-conditioning and refrigerating and air-conditioning apparatus

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 12

[0062](Refrigerating Machine Oil Component)

[0063]For the enhancement of efficiency of the compressor for refrigeration and air-conditioning, the dissolved viscosity of the refrigerant and the refrigerating machine oil in a mutually dissolved state (which will be hereinafter simply referred to as “dissolved viscosity”) is the important factor.

[0064]A refrigerant whose lower critical solution temperature at which liquid-liquid double layer separation starts to occur at low temperatures is −30° C. or less and a refrigerating machine oil are combined. In this case, the refrigerant is dissolved in a large amount in the refrigerating machine oil according to the compressor operation conditions. Accordingly, the dissolved viscosity is largely reduced. When the dissolved viscosity in the compressor is low, not only the compression part sealing property is reduced, but also the oil film strength at the compressor sliding part is reduced. Accordingly, wear proceeds, resulting in degradation o...

examples 13 to 25

[0090]A refrigerant and a refrigerating machine oil are charged in the compressor for refrigeration and air-conditioning.

[0091]The compatibility between the refrigerant and the refrigerating machine oil is one of important characteristics in terms of ensuring the reliability of the compressor such as oil return from the refrigeration cycle to the compressor (ensuring the oil amount inside the compressor) or reduction of the heat exchange efficiency. However, the dissolved viscosity of the liquid mixture largely varies according to the amount of the refrigerant dissolved in the refrigerating machine oil due to the presence of the refrigerant. A large dissolution amount results in a remarkable reduction of the viscosity of the oil. Accordingly, a sufficient oil film strength cannot be obtained at the sliding part. Further, the function as the sealing material of the compression part is impaired.

[0092]The compatibility between the refrigerant and the refrigerating machine oil was evalu...

examples 38 and 39

, Comparative Examples 9 and 10

[0107]FIG. 1 shows the outline of a dual-purpose cooling / heating room air conditioner used in the present Examples.

[0108]When an inside of a room is cooled, a high-temperature high-pressure refrigerant gas (charged refrigerant) adiabatically compressed through a discharge pipe of a compressor 1 passes through a four-way valve 2 to be cooled in an outdoor heat exchanger 3 (used as a condensing means), resulting in a high-pressure liquid refrigerant. The refrigerant is expanded in an expansion means 4 (such as a capillary tube or a temperature type expansion valve, which is also referred to as a pressure reducing unit), resulting in a low-temperature low-pressure solution slightly containing a gas. The solution reaches the indoor heat exchanger 5 (used as an evaporation means), and gets heat from the air inside the room, resulting in a low-temperature gas form. The resulting gas passes through the four-way valve 2 again, and reaches the compressor 1. Whe...

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PUM

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Abstract

A refrigerating machine oil including a refrigerating machine oil basis such as polyol ester oil and an additive polyol ester oil is mixed to a refrigerant including 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene or the like. A compressor for refrigeration and air-conditioning including the mixture charged therein is used. The composition of the additive polyol ester oil is 1 to 30 wt %.
The wear resistance of the compressor is improved, and the efficiency of a refrigerating and air-conditioning apparatus using the compressor is enhanced.

Description

CLAIM OF PRIORITY[0001]The present application claims priority from Japanese Patent application serial No. 2010-169889, filed on Jul. 29, 2010, the content of which is hereby incorporated by reference into this application.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a compressor for refrigeration and air-conditioning and a refrigerating and air-conditioning apparatus using a heat pump cycle.[0004]2. Description of Related Art[0005]As the global environment measures in a refrigerating and air-conditioning system field, mention may be made of substitution of CFC (Chlorofluorocarbons) and HCFC (Hydrochlorofluorocarbons) used as refrigerants or heat insulating materials as ozone depleting substances, and substitution of HFC (Hydrofluorocarbons) used for enhancement of efficiency or refrigerants as global warming countermeasures. These have been positively pursued.[0006]For substitutes of CFC and HCFC which are ozone depleting substanc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B41/00F25B1/00
CPCC09K5/042C10N2220/022C09K2205/126C09K2205/24C10M171/008C10M2203/1065C10M2205/0285C10M2207/283C10M2207/2835C10M2209/043C10M2209/105C10N2220/302C10N2220/303C10N2230/06C10N2240/30F25B1/04C09K5/045C10M2209/108C10N2020/02C10N2030/06C10N2040/30C10N2020/101C10N2020/103C09K5/04C10M105/38F04B39/02F25B1/00
Inventor OTA, RYOSUGANO, TSUNEJIARAKI, KUNINARI
Owner HITACHI APPLIANCES INC
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