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Refrigerating apparatus

A refrigeration device and refrigerant technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as weakening, and achieve the effects of improving performance, increasing refrigeration effect, and reducing the amount of compression work.

Active Publication Date: 2011-06-29
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] That is, if the amount of the first refrigerant flow is too large, the amount of the second refrigerant flow that is finally evaporated in the evaporator will be insufficient. On the contrary, if the amount of the first refrigerant flow is too small, the The cooling effect (i.e., the effect of separating the circulation) is reduced

Method used

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Embodiment Construction

[0096] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a refrigerant circuit diagram of the refrigeration apparatus R which concerns on embodiment of this invention. The refrigerator R of this embodiment includes a refrigerator unit 3 and a plurality of showcase units 5A, 5B. The refrigerator unit 3 and each showcase unit 5A, 5B are connected by refrigerant pipes 7 and 9 to form a predetermined refrigeration cycle.

[0097] In this refrigerating cycle, carbon dioxide whose refrigerant pressure on the high pressure side (high pressure) is equal to or higher than its critical pressure (supercritical) is used as a refrigerant. This carbon dioxide refrigerant is a natural refrigerant that is beneficial to the global environment and considers flammability, toxicity, and the like. In addition, existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, and PAG (polyalkylene glycol) are u...

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Abstract

The present invention provides a refrigerating apparatus to obtain an adequate medium pressure of the refrigerant circuit of the refrigerating apparatus and precisely obtain the effect of a split cycle, thereby enhancing the performance of the refrigerating apparatus. The refrigerating apparatus (R) in the present invention has a split cycle device, in the refrigerating apparatus (R), an operation amount of the valve open degree of a auxiliary reducing means (83) is determined by calculating and merging from a first control amount to a third control amount, wherein the first control amount isobtained based on a discharged refrigerant temperature (DT) of the compressor (11), the second control amount is obtained based on an over-compression judgment value (MPO) and a high pressure side pressure (HP), wherein the over-compression judgment value (MPO) is obtained based on an adequate medium pressure (MP) and a low pressure side pressure (LP) of the refrigerant circuit, and the third control amount is obtained by a difference between a temperature (GCT) of the refrigerant passed through the gas cooler and a temperature (LT) of the second refrigerant flow passed through the intermediate heat exchanger.

Description

technical field [0001] The present invention relates to a refrigeration device including a first refrigerant flow and a second refrigerant flow adjusted according to predetermined control characteristics, and a high-pressure side having a supercritical pressure. Background technique [0002] At present, in this kind of refrigeration device, a refrigeration cycle is composed of a compression mechanism, a gas cooler, and a throttling mechanism. , so as to use the evaporation of the refrigerant at this time to cool the surrounding air. In recent years, it has been impossible to use Freon-based refrigerants in such refrigerators due to natural environmental problems and the like. Therefore, a refrigeration device using carbon dioxide, which is a natural refrigerant, as a substitute for Freon refrigerant has been developed. It is known that the carbon dioxide refrigerant is a refrigerant with a large high-pressure difference, and has a low critical pressure, and the high-pressu...

Claims

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Application Information

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IPC IPC(8): F25B49/02
CPCF25B49/02F25B2600/25F25B2400/075F25B2400/072F25B2400/04F25B41/20
Inventor 三原一彦佐佐木英孝长谷川说川久保贤大竹雅久
Owner SANYO ELECTRIC CO LTD
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