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Refrigeration apparatus

Inactive Publication Date: 2015-10-22
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The refrigeration apparatus described in this patent can prevent the deterioration and corrosion of refrigerator oil, and improve lubrication performance. It can also prevent the wear and burning of sliding parts, and prevent the separation of refrigerant from the refrigerator oil. In summary, the technical effects of this patent are better protection of the refrigeration system and improved efficiency of the refrigeration process.

Problems solved by technology

However, although these fluorine-based refrigerants do not contain chlorine and therefore have little effect of destroying the ozone layer, they strongly impact global warming due to the greenhouse effect.

Method used

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embodiments

[0030]There shall now be described an air-conditioning apparatus 1 as a refrigeration apparatus according to an embodiment of the present invention. FIG. 1 is a refrigerant circuit diagram of the air-conditioning apparatus 1. The air-conditioning apparatus 1 is configured primarily from a compressor 2, a four-way switching valve 3, an outdoor heat exchanger 4, an expansion mechanism 5, and an indoor heat exchanger 6. In FIG. 1, the solid-line arrows represent the flow of refrigerant during an air-cooling operation, and the dashed-line arrows represent the flow of refrigerant during an air-heating operation.

[0031]The refrigerating cycle of the air-conditioning apparatus 1 during the air-cooling operation shall now be described. First, the compressor 2 compresses low-pressure gas refrigerant and discharges high-pressure gas refrigerant. The refrigerant discharged from the compressor 2 passes through the four-way switching valve 3 to be supplied to the outdoor heat exchanger 4. The out...

examples

[0056]The test results for the refrigerator oil used by the refrigeration apparatus in the present embodiment are described. In the refrigerator oil tests, a product prototype test was performed and the impact of the refrigerator oil on the refrigeration apparatus was analyzed.

[0057]In these tests, the refrigeration apparatus was run with varying added amounts of the acid scavenger blended into the refrigerator oil. The state of the brass expansion valve of the expansion mechanism of the refrigeration apparatus was then confirmed. The results of the prototype test are shown in the following Table 1. The test conditions were such that the temperature of the refrigerant gas discharged from the compressor was 120° C., the operating time of the refrigeration apparatus was 2000 hours, and the operating pressure of the refrigeration apparatus was a value set as appropriate. Polyvinyl ether oil was used as the base oil of the refrigerator oil. 0.3 to 5.0 wt % of an acid scavenger was added...

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Abstract

A refrigeration apparatus includes a compressor, a condenser, an expansion mechanism, and an evaporator. A refrigerant containing R32 and refrigerator oil are used in the refrigeration apparatus. The refrigerator oil is used to lubricate the compressor. An acid scavenger added in an amount of 1.0 wt % to 5.0 wt % is blended in the refrigerator oil. The amount of air mixed into the refrigeration apparatus is controlled to 500 ppm or less relative to the amount of filled refrigerant. The amount of water mixed into the refrigeration apparatus is controlled to 300 ppm or less relative to the amount of filled refrigerant. A discharged-gas temperature of the refrigeration apparatus is controlled to 120° C. or less.

Description

TECHNICAL FIELD[0001]The present invention relates to a refrigeration apparatus.BACKGROUND ART[0002]Conventionally, refrigerator oil used for air-conditioning apparatuses and other refrigeration apparatuses has contained substances for suppressing deterioration of the refrigerator oil and corrosion of expansion valves caused by in hydrofluoric acid and other acids produced by refrigerant decomposition. For example, in the refrigerator oil disclosed in Patent Literature 1 (Japanese Laid-open Patent Application No. 2001-226690), at least 0.05 wt % of an acid scavenger is added.[0003]In addition, conventionally, air-conditioning apparatuses and other refrigeration apparatuses have used R134a which is tetrafluoroethane, R410A and R407C which are mixed refrigerants, and other fluorine-based refrigerants. However, although these fluorine-based refrigerants do not contain chlorine and therefore have little effect of destroying the ozone layer, they strongly impact global warming due to the...

Claims

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Application Information

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IPC IPC(8): F25B13/00
CPCF25B13/00C09K5/045C10M171/00C10M129/74C10M145/28C10M171/008F25B2313/02741C09K2205/24C10M2207/2835C10M2209/043C10N2020/101C10N2030/10C10N2030/12C10N2030/06C10N2040/30F25B41/31F25B41/20C10M2203/04C10M2207/042C10M2215/14C09K5/04C10M105/32C10M107/24C10M129/18C10M133/22C10M169/04F25B1/00
Inventor TANAKA, MASARUMATSUURA, HIDEKITAIRA, SHIGEHARUNAKAI, AKINORI
Owner DAIKIN IND LTD