Claims
- 1. A refrigerating cycle comprising:
- a refrigerant containing hydrofluorocarbon as a main component and a refrigerator oil which has no compatibility with the refrigerant so that the refrigerator oil and the refrigerant are in the form of two-phase separation in a liquid portion in the refrigerating cycle;
- wherein:
- refrigerator oil and refrigerant are both circulated; and
- an accumulator is provided in a final stage between a compressor and an evaporator, wherein said accumulator, said compressor and said evaporator are connected via a refrigerant pipe arrangement, which is determined in size and direction so that the refrigerator oil can surely flow to the accumulator;
- an internal volume of the accumulator is determined so as not to cause any trouble against a running of the compressor even if the accumulator is filled with the refrigerator oil and/or the compressor is operated intermittently, and when the accumulator is filled with refrigerant and refrigerator oil, the refrigerant which has a larger specific gravity than the refrigerator oil will settle below the refrigerator oil, so as to permit the refrigerant to return to the compressor before the refrigerator oil, for reducing a load on the compressor caused by a sucking of refrigerator oil into the compressor; and
- said accumulator is provided near the compressor on a suction side of the compressor and is located in a suction pipe which leads to the compressor, so that the refrigerant flows in a downward direction to the compressor.
- 2. A refrigerating cycle comprising:
- a refrigerant containing hydrofluorocarbon as a main component and a refrigerator oil which has no compatibility with the refrigerant so that the refrigerator oil and the refrigerant are in the form of two-phase separation in a liquid portion in the refrigerating cycle; wherein,
- refrigerator oil and refrigerant are both circulated; and
- an accumulator is provided in a final stage between a compressor and an evaporator, wherein said accumulator, said compressor and said evaporator are connected via a refrigerant pipe arrangement, which is determined in size and direction so that the refrigerator oil can surely flow to the accumulator;
- an internal volume of the accumulator is determined so as not to cause any trouble as a result of lack of oil in the compressor when running the compressor because a sufficient quantity of the oil remains in the compressor even if at least one of,
- the accumulator is filled with the refrigerator oil and
- the compressor is operated intermittently.
- 3. The refrigerating cycle of claim 2, wherein:
- said refrigerant pipe arrangement comprises an ascending pipe; and
- a zero penetration flow rate, Ug*, of said refrigerant in said ascending pipe complies with a relationship, ##EQU5##
- =(g.multidot.dx.multidot.(867Vx-1)).sup.0.5
- where,
- g is a gravitation acceleration (m/sec.sup.2),
- .rho..sub.oil is oil liquid density (Kg/m.sup.3)=867(Kg/m.sup.3),
- .rho.g is refrigerant gas density (Kg/m.sup.3),
- dx is an inner diameter of the pipe in a state x (m) ,
- Vx is a specific volume in the state x (m.sup.3 /Kg), and
- x is a state of running.
- 4. The refrigerating cycle of claim 2, wherein:
- said refrigerant pipe arrangement comprises an ascending pipe having an inner diameter dx determined by a relationship, ##EQU6## where, g is a gravitation acceleration (m/sec.sup.2),
- dx is the inner diameter of the pipe (m) ,
- Vx is a specific volume (m.sup.3 /Kg),
- N is a rotation number (rps),
- .eta.v is a volume efficiency, and
- Vx is a specific volume of sucked gas (m.sup.3 /Kg).
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-245040 |
Sep 1993 |
JPX |
|
5-335998 |
Dec 1993 |
JPX |
|
Parent Case Info
This is a Continuation of application Ser. No. 08/267,906 filed on Jul. 6, 1994, now U.S. Pat. No. 5,517,824.
US Referenced Citations (4)
Non-Patent Literature Citations (2)
Entry |
U.S. application No. 08/273,848, Konishi et al., filed Jul. 12, 1994. |
U.S. application No. 08/582,932, Konishi et al., filed Jan. 4, 1996. |
Continuations (1)
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Number |
Date |
Country |
Parent |
267906 |
Jul 1994 |
|