Refrigeration device using hydrofluorocarbon refrigerant
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsSusumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
Life of this patent
Estimating the term…
Abstract
A refrigeration device comprising a compressor, a condenser, an evaporator, an accumulator and a refrigerant is described. Lubricating oil present in the compressor is chosen so as to be insoluble with the refrigerant, and a particular accumulator design is described to ensure return of oil back to the compressor.
Claims31
A closed-loop refrigeration device comprising a compressor, a condenser, an evaporator, a refrigerant, a lubricating oil, an accumulator and a suction pipe;
- said refrigerant comprising a hydrofluorocarbon as a main ingredient;
- said lubricating oil being stored in said compressor for lubricating movable members thereof and having a smaller specific gravity than the refrigerant and being insoluble with said refrigerant;
- an upper end portion of said accumulator being connected to an outlet of said evaporator;
- one end of said suction pipe being inserted into said accumulator upwardly from below, another end of said suction pipe being connected to an introduction port of said compressor;
- said suction pipe and said accumulator forming a refrigerant pooling section between a bottom of said accumulator and an opening provided in a wall of that portion of said suction pipe inserted into said accumulator for storing said refrigerant and said insoluble lubricating oil in a phase separated state;
- wherein said device is arranged such that said refrigerant and said lubricating oil flow downwardly through said suction pipe from an upper end of said accumulator during operation.
A closed-loop refrigeration device comprising a compressor, a condenser, an evaporator, a hydrofluorocarbon refrigerant and a lubricating oil, wherein said refrigerant is insoluble in said lubricating oil at operating temperatures of the device and said lubricating oil has a smaller specific gravity than said refrigerant.
A refrigeration air conditioning system comprising:
- a closed-loop refrigerant circuit for circulating a refrigerant containing hydrofluorocarbon as its main ingredient, in which a compressor, a condenser and an evaporator are connected by pipes wherein
- bearings of said compressor are assembled by applying a first oil which is insoluble with said refrigerant as a process oil, and
- a housing of said compressor is provided for storing a second oil which is insoluble with said refrigerant and has a smaller specific gravity than said refrigerant as a lubricating oil in a single or mixed state.
Dependencies are inferred from the claim text.