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Refrigeration apparatus

A refrigeration device and refrigerant technology, which is applied to household refrigeration devices, refrigerators, refrigeration components, etc.

Inactive Publication Date: 2008-07-09
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Examples

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no. 1 example 》

The refrigerating apparatus 10 of the first embodiment is installed in a convenience store or the like to cool a plurality of freezers.

[0055] As shown in FIG. 1 , the refrigerating device 10 of the first embodiment has an outdoor unit 11 , a first refrigerated showcase 12 , a second refrigerated showcase 13 , a first booster unit 14 and a second booster unit 15 . The outdoor unit 11 is installed outdoors. On the other hand, the other units 12, 13, 14, and 15 are installed in stores such as convenience stores.

[0056] The outdoor unit 11 is provided with an outdoor circuit 40, the first refrigerated showcase 12 is provided with a first refrigerated circuit 80, the second refrigerated showcase 13 is provided with a second refrigerated circuit 90, and the first booster unit 14 is provided with a A supercharging circuit 100 is provided with a second supercharging circuit 120 in the second supercharging unit 15 . In this refrigerating apparatus 10, these circuits 40, 80, 90, 1...

no. 2 example 》

The refrigeration system 10 of the second embodiment is different from the above-mentioned first embodiment in the structure of the refrigerant circuit 20 and the operation of the defrosting operation. Differences from the first embodiment described above will be described below.

[0121]As shown in FIG. 4 , the refrigerant circuit 20 of the second embodiment is provided with two liquid injection pipes 190 , 192 . One end of the first liquid injection pipe 190 is connected between the first cooling heat exchanger 83 of the first refrigeration circuit 80 and the first indoor expansion valve 82 . On the other hand, the other end of the first liquid injection pipe 190 is connected to the first low-stage suction pipe 113 of the first booster circuit 100 . The first liquid injection pipe 190 is provided with a first liquid injection valve 191 . The first liquid injection valve 191 is composed of an electronic expansion valve whose opening degree can be adjusted. Furthermore, one ...

no. 3 example 》

The refrigeration device 10 of the third embodiment is different from the above-mentioned first embodiment and the second embodiment in the structure of the booster units 14 , 15 . Differences from the first and second embodiments described above will be described below.

[0141] As shown in FIG. 6 , in the first booster circuit 100 of the first booster unit 14 , a first oil separator 143 is provided on the discharge side of the second inverter compressor 101 and the third fixed frequency compressor 102 . Similarly, in the second booster circuit 120 of the second booster unit 15 , a second oil separator 144 is provided on the discharge side of the third inverter compressor 121 and the fourth fixed frequency compressor 122 .

[0142]As shown in FIG. 7 , each of the oil separators 143 and 144 is constituted by a so-called demister type oil separator. Each of the oil separators 143 and 144 has an airtight oil recovery container 145 and a demister 146 . Each oil recovery containe...

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Abstract

The refrigerant circuit (20) is provided with low-stage compressors (101, 102, 121, 122), high-stage compressors (41, 42, 43), an outdoor heat exchanger (44), and a utilization-side heat exchanger ( 83, 93). During the defrosting operation of this refrigeration device (10), the high stage side compressors (41, 42, 43) are operated. The refrigerant discharged from the high-stage compressors (41, 42, 43) is introduced into the use-side heat exchangers (83, 93) to heat the frost from the inside. Thereafter, the refrigerant is evaporated in the outdoor heat exchanger (44), compressed in the high-stage compressors (41, 42, 43), and sent to the use-side heat exchangers (83, 93) again.

Description

technical field [0001] The present invention relates to a refrigerating device performing a two-stage compression refrigerating cycle, in particular to a defrosting technique for a heat exchanger on the utilization side for cooling the air in a freezer or the like. Background technique [0002] Refrigerators equipped with a refrigerant circuit that performs a refrigeration cycle have been known, and are widely used as cooling devices such as refrigerators and freezers for storing food and the like. [0003] For example, Patent Document 1 proposes a refrigeration device for cooling the air in a freezer in a convenience store or the like. A low-stage compressor, a high-stage compressor, an outdoor heat exchanger (heat source side heat exchanger), and a cooling heat exchanger (usage side heat exchanger) are connected to the refrigerant circuit of the refrigeration system. In this refrigeration system, the cooling heat exchanger is used as the evaporator and the heat source sid...

Claims

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Application Information

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IPC IPC(8): F25B47/02F25B1/00F25B1/10F25D21/14
Inventor 植野武夫竹上雅章北宏一谷本憲治小田吉成野村和秀近藤东
Owner DAIKIN IND LTD
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