# US 2019/0170425 A1 · Freezing refrigerator

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- Number: US 2019/0170425 A1
- Document ID: US20190170425A1
- Status: Published application
- Kind: A1
- Application number: 16/210,754
- Filed: 2018-12-05
- Published: 2019-06-06
- Earliest claimed: 2017-12-05
- Assignees: Panasonic Corporation
- Applicants: Panasonic Corporation
- Inventors: Fuminori TAKAMI; Terutsugu SEGAWA
- Web page: https://patentgrep.com/patent/US20190170425A1

## CPC

- F25B 41/40: Fluid line arrangements
- F25D 17/045: {Air flow control arrangements}
- F25D 17/062: {in household refrigerators}
- F25D 21/08: by electric heating
- F25B 39/02: Evaporators
- F25B 2400/052: between the capillary tube and another part of the refrigeration cycle
- F25B 2400/054: between the suction tube of the compressor and another part of the cycle
- F25D 2317/0681: Details thereof
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B)

## Abstract

A freezing refrigerator heats an entrance side pipe of evaporator, which is difficult to heat in the related art, with the condensation latent heat of refrigerant that builds up in a lower portion of evaporator in a liquid state while being vaporized with the heat of defrosting heater so as to warm the outlet pipe by a second thermal coupling part thermally coupling an inlet pipe and an outlet pipe of evaporator, whereby temperature variation of the entire evaporator in a defrosting operation can be suppressed, and the power consumption of defrosting heater can be reduced.

## Claims

### Claim 1

A freezing refrigerator comprising:
a compressor;
a condenser;
a dryer;
a decompressor;
an evaporator;
a first pipe including an inlet pipe of the evaporator;
a second pipe including an outlet pipe of the evaporator;
a first thermal coupling part configured to thermally couple the decompressor and the second pipe together; and
a second thermal coupling part configured to thermally couple the first pipe and the second pipe together, wherein
the compressor, the condenser, the dryer, the decompressor and the evaporator configure a refrigerant cycle.

### Claim 2 (depends on 1)

The freezing refrigerator according to claim 1,
wherein the first pipe includes an expanding portion, and
wherein a pipe diameter downstream of the expanding portion is greater than a pipe diameter upstream of the expanding portion.

### Claim 3 (depends on 2)

The freezing refrigerator according to claim 2, wherein the second thermal coupling part is located on the evaporator side after the expanding portion.

### Claim 4 (depends on 1)

The freezing refrigerator according to claim 1, wherein the second thermal coupling part thermally couples an accumulator provided in an outlet pipe of the evaporator and an inlet pipe of the evaporator together.

### Claim 5 (depends on 1)

The freezing refrigerator according to claim 1, wherein the second coupling part includes:
an accumulator provided in an outlet pipe of the evaporator; and
an inlet pipe of the evaporator, the inlet pipe passing through inside of the accumulator.

### Claim 6 (depends on 1)

The freezing refrigerator according to claim 1,
wherein an entrance of the evaporator is disposed at an upper portion of an entirety of the evaporator;
wherein a pipe of the evaporator includes a plurality of pipe lines, each pipe line being one pipe which extends in a vertical direction while horizontally meandering by a predetermined number of times, the plurality of pipe lines being arranged in a front-rear direction orthogonal to the vertical direction and the horizontal direction;
wherein a fin for facilitating heat exchange is attached to the pipe; and
wherein the second thermal coupling part thermally couples a returning vertical pipe with the inlet pipe of the evaporator, the returning vertical pipe extending from a lower side to an upper side and being communicated with a pipe of an end portion disposed at a position closest to an outlet of the evaporator when a number of the pipe line is an odd number.