Cold stocker

a stocker and cold technology, applied in the field of cold stockers, can solve the problems of large amount of cooling air that needs to be blown to the radiator, large amount of power consumed by the fan, and large noise, so as to reduce the thermal load of the heat dissipation system, reduce power consumption, and improve the heat dissipation efficiency of the whole heat dissipation system

Inactive Publication Date: 2007-05-10
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0050] With this structure, since the heat storage portion is formed in the warm-side refrigerant circulation circuit that includes the heat exchange portion and the heat exchanger disposed in the warm section of the Stirling refrigerating engine, it is possible, even if the Stirling refrigerating engine is off, to carry out defrosting by making use of heat stored in the heat storage portio

Problems solved by technology

Furthermore, a large amount of cooling air needs to be blown to the radiator.
Such a structure is accompanied by inconveniences such as: dust clogging between the fins for dissipating heat; big noise caused by the blowing air; and a large amount of power consumed by the fan.
In addition, the air cooling method itself inherently suffers from a large thermal resistance and does not help achieve absorption of enough heat.
This inconveniently prevents the difference between the temperature of the warm section and the ambient temperature from reducing quickly, which prevents the COP (coefficient of perform

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0070] From a top, to a rear, and further to a bottom of the housing 10, a cooling system and a heat dissipation system are arranged having a Stirling refrigerating engine as their main component. FIG. 1 (sectional view) and FIG. 2 (piping arrangement diagram) show a first embodiment thereof.

[0071] In a corner between the top and the rear of the housing 10, a mounting space 19 is formed, in which a Stirling refrigerating engine 30 is mounted. Part of the Stirling refrigerating engine 30 is a cold section, to which a cold-side heat exchanger 41 is fitted. In the back of the cooling compartment 13, a compartment-cooling heat exchanger 42 is mounted. The cold-side heat exchanger 41 and the compartment-cooling heat exchanger 42 are connected to each other via a refrigerant pipe so as to form a cold-side refrigerant circulation circuit 40 (see FIG. 2). The cold-side refrigerant circulation circuit 40 is charged with a natural refrigerant such as CO2. Inside the cold-side heat exchanger 4...

second embodiment

[0106] the cold stocker of the present invention is illustrated in FIG. 3. Here, the heat exchange portion 62 for promoting evaporation in drainage and the heat exchange portion 63 for preventing dew condensation on the cold stocker wall are connected in parallel with each other, and this parallel connection configuration is connected in series with the second warm-side heat exchanger 61 and the circulation pump 64. In this embodiment, too, the circulation pump 64 is arranged at the most upstream part of the second warm-side refrigerant circulation circuit 60. Inside the parallel connection configuration, a valve 65 is connected to the heat exchange portion 62 at the upstream side thereof, and a valve 66 is connected in series with the heat exchange portion 63 at the upstream side thereof.

[0107] With the above structure, the flow resistance of the refrigerant at the heat exchange portions 62 and 63 is approximately half that in the first embodiment, and thus the power consumption of...

third embodiment

[0112] In the third embodiment, the warm-side heat exchanger 71 built as one block is fitted to the warm section of the Stirling refrigerant engine 30. As in the first warm-side heat exchanger 51 and the second warm-side heat exchanger 61, a great number of fins are provided in the warm-side heat exchanger 71 so as to achieve efficient heat exchange with the refrigerant. To the warm-side heat exchanger 71, there are connected the circulation pump 64, the heat exchange portion 62 for promoting evaporation in drainage, the heat exchange portion 63 for preventing dew condensation on the cold stocker wall, and heat exchanger 52 for dissipating heat in this order from the upstream of the flow of the refrigerant to form a serial circuit so as to form a warm-side refrigerant circulation circuit 70.

[0113] When the Stirling refrigerating engine 30 is driven, the warm-side heat exchanger 71 is heated. When the warm-side heat exchanger 71 is heated, the refrigerant starts evaporating so as to ...

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Abstract

In a cold stocker according to the present invention, a compartment-cooling heat exchanger is connected to a cold-side heat exchanger mounted to a cold section of a Stirling refrigerating engine so as to form a cold-side refrigerant circulation circuit. To a warm section of the Stirling refrigerating engine, a first warm-side heat exchanger and a second warm-side heat exchanger are mounted. A heat-dissipating heat exchanger is connected to the first warm-side heat exchanger so as to form a first warm-side refrigerant circulation circuit. To the second warm-side heat exchanger are connected a heat exchange portion for promoting evaporation in drainage and a heat exchange portion for preventing dew condensation on a cold stocker wall so as to form a second warm-side refrigerant circulation circuit.

Description

TECHNICAL FIELD [0001] The present invention relates to a cold stocker that uses to a Stirling engine to cool the inside of a compartment thereof. A “cold stocker” is a concept encompassing appliances in general in which the temperature in a closed space thereof (referred to as the “compartment” thereof) is lowered for the purpose of preserving food and the like, and the specific product name thereof is not limited to “refrigerator”, “freezer”, “refrigerator-freezer”, or the like. BACKGROUND ART [0002] In the refrigerating cycle of a cold stocker, a chlorofluorocarbon (CFC) or a hydrochlorofluorocarbon (HCFC) is used as a refrigerant. Since these refrigerants, when released into the atmosphere, more or less lead to the destruction of the ozone layer, the production and use thereof are globally regulated. [0003] Hence, Stirling refrigerating engines, which do not use an ozone depleting substance as a refrigerant, have been attracting much attention. In a Stirling refrigerating engine...

Claims

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Application Information

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IPC IPC(8): F25B9/00F25D21/06F25B9/14F25D21/04F25D11/00F25D21/14F25D23/00
CPCF25B9/14F25D21/04F25D21/14F25D23/003F25D2317/0665F25D2317/0682F25D2400/04F25D11/00F25D21/00
Inventor CHEN, WEIZHANG, HENGLIANGYONEDA, TETSUYAMASUDA, MASAAKI
Owner SHARP KK
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