# US 2018/0023847 A1 · Ejector refrigeration cycle

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- Number: US 2018/0023847 A1
- Document ID: US20180023847A1
- Status: Published application
- Kind: A1
- Application number: 15/551,047
- Filed: 2016-03-04
- Published: 2018-01-25
- Earliest claimed: 2015-03-23
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Youhei NAGANO; Haruyuki NISHIJIMA; Yoshiyuki YOKOYAMA
- Web page: https://patentgrep.com/patent/US20180023847A1

## CPC

- F25B 41/335: via diaphragms
- F04B 39/04: Measures to avoid lubricant contaminating the pumped fluid
- F04B 41/06: Combinations of two or more pumps
- F25B 1/06: with compressor of jet type, e.g. using liquid under pressure ({F25B1/005,} F25B1/10 take precedence)
- F25B 41/00: Fluid-circulation arrangements
- F25B 43/02: for separating lubricants from the refrigerant
- F25B 2341/0011: Ejectors with the cooled primary flow at reduced or low pressure
- F25B 2341/0012: Ejectors with the cooled primary flow at high pressure
- F25B 2400/23: Separators
- F25B 2500/18: Optimization, e.g. high integration of refrigeration components
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

An ejector refrigeration cycle has a compressor, a radiator, an ejector, a swirl flow generator, an evaporator, and an oil separator. The compressor compresses refrigerant, mixed with refrigerant oil compatible with a liquid-phase refrigerant, and discharges the high-pressure refrigerant. The ejector has a nozzle and a body having a refrigerant suction port and a pressure increasing part. The swirl flow generator is configured to cause a decompression boiling in the refrigerant by causing the refrigerant to swirl about a center axis of the nozzle. The oil separator separates the refrigerant oil from the high-pressure refrigerant compressed by the compressor and guides the refrigerant oil to flow to a suction side of the compressor. The oil separator decreases a concentration of the refrigerant oil in the refrigerant, which is to flow into the swirl flow generator, so as to promote the decompression boiling of the refrigerant in the swirl flow generator.

## Claims

### Claim 1

An ejector refrigeration cycle comprising:
a compressor that compresses refrigerant, mixed with refrigerant oil, to be a high-pressure refrigerant and discharges the high-pressure refrigerant, the refrigerant oil being compatible with a liquid-phase refrigerant;
a radiator that causes a high-pressure refrigerant discharged by the compressor to radiate heat to be a subcooled liquid-phase refrigerant;
an ejector having
a nozzle that decompresses the refrigerant flowing from the radiator and injects the refrigerant as an injection refrigerant at a high speed and
a body that has a refrigerant suction port and a pressure increasing part, the refrigerant suction port that draws the refrigerant, as a suction refrigerant, using suction power of the injection refrigerant, the pressure increasing part that mixes the injection refrigerant and the suction refrigerant and increases a pressure of a mixture of the injection refrigerant and the suction refrigerant;
a swirl flow generator that is configured to cause the refrigerant flowing from the radiator to swirl about a center axis of the nozzle at a speed causing a decompression boiling of the refrigerant swirling adjacent to the center axis, the refrigerant flowing into the nozzle;
an evaporator that evaporates refrigerant and guides the refrigerant to the refrigerant suction port; and
an oil separator that separates the refrigerant oil from the high-pressure refrigerant compressed by the compressor and guides the refrigerant oil to flow to a suction side of the compressor, wherein
the oil separator decreases a concentration of the refrigerant oil in the refrigerant, which is to flow into the swirl flow generator, so as to promote the decompression boiling of the refrigerant in the swirl flow generator.

### Claim 2 (depends on 1)

The ejector refrigeration cycle according to claim 1, wherein
the body has a gas-liquid separator that separates the refrigerant flowing from the pressure increasing part into a liquid-phase refrigerant and a gas-phase refrigerant,
the liquid-phase refrigerant separated in the gas-liquid separator flows to an inlet side of the evaporator and
the gas-phase refrigerant separated in the gas-liquid separator flows to the suction side of the compressor.

### Claim 3 (depends on 1)

The ejector refrigeration cycle according to claim 1, further comprising
a gas-liquid separator that separates the refrigerant flowing out of the ejector into a liquid-phase refrigerant and a gas-phase refrigerant, wherein
the liquid-phase refrigerant separated in the gas-liquid separator flows to an inlet side of the evaporator, and
the gas-phase refrigerant separated in the gas-liquid separator flows to the suction side of the compressor.

### Claim 4 (depends on 1)

The ejector refrigeration cycle according to claim 1, further comprising
a discharge capacity controller that controls a discharge capacity of the compressor, wherein
the discharge capacity controller controls the discharge capacity of the compressor such that a refrigerant evaporating temperature in the evaporator approaches a target evaporating temperature.

### Claim 5

(canceled)