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US 6,438,980 B1Granted
Refrigerating apparatus, refrigerator, air-cooled type condenser unit for refrigerating apparatus and compressor unit
AssigneeHitachi, Ltd.
InventorsTakashi Sakurai, Hideo Takemoto
Life of this patent
Estimating the term…
Abstract
In a refrigerating apparatus using an HFC group refrigerant, the. performance is improved by increasing the refrigerating capacity and a stable operation is made possible. In order to achieve this, a cycle system in a refrigerator is structured so as to connect a compressor, a condenser, a liquid receiver and a supercooler in this order. In an air-cooled separation type refrigerator, the liquid receiver is disposed within an air-cooled type condenser unit. Further, in the case where a flush gas is liable to be generated in a liquid pipe, a vapor-liquid separator is disposed within the compressor unit integral with an accumulator and separated therefrom by a partition plate.
Claims10
An air-cooled type condenser unit for a refrigerating apparatus comprising
- a compressor,
- a condenser,
- a cooling fan for cooling said condenser,
- a first refrigerant pipe for feeding refrigerant from said compressor to said condenser,
- a liquid receiver to which refrigerant from said condenser is supplied,
- a supercooler for further cooling refrigerant taken out from said liquid receiver,
- a second refrigerant pipe for feeding refrigerant from said supercooler towards a low pressure side device;
- and
- a liquid injection line for injecting liquid refrigerant flowing in said second refrigerant pipe downstream of said supercooler to a compressing chamber of said compressor, wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument, and
- said electromagnetic valve is controlled to be closed when said compressor is stopped.
8 more elements
A refrigerator having
- a compressor,
- a pipe for circulating an HFC group refrigerant, selected from a group consisting of R404A and R507A, in a closed manner by said compressor,
- a condenser for condensing HFC group refrigerant discharged from said compressor,
- a liquid receiver to which HFC group refrigerant from the condenser is supplied,
- a pipe for taking out only HFC group liquid refrigerant having a dryness of 0 from said liquid receiver and feeding it to a supercooler,
- an accumulator disposed in a refrigerant pipe for feeding refrigerant from a low pressure side device to said compressor, and
- a liquid injection line for injecting a part of the liquid refrigerant in said refrigerant pipe downstream of said condenser to a compressing chamber in said compressor, wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument, and
- said electromagnetic valve is controlled to be closed when said compressor is stopped.
6 more elements
An air-cooled type condenser unit for a refrigerating apparatus comprising
- a compressor,
- a condenser,
- a cooling fan for cooling said condenser,
- a first refrigerant pipe for feeding a refrigerant from said compressor to said condenser,
- a liquid receiver to which refrigerant from said condenser is supplied,
- a second refrigerant pipe for feeding refrigerant from said liquid receiver towards a low pressure side device;
- a sight glass capable of observing the flow state of the refrigerant in said second refrigerant pipe, and
- a liquid injection line for injecting liquid refrigerant flowing in said second refrigerant pipe upstream of said sight glass to a compressing chamber of said compressor, wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument, and
- said electromagnetic valve is controlled to be closed when said compressor is stopped.
7 more elements
A refrigerator having
- a compressor,
- a pipe for circulating an HFC group refrigerant, selected from a group consisting of R404A and R507A, in a closed manner by said compressor,
- a condenser for condensing HFC group refrigerant discharged from said compressor,
- a liquid receiver to which HFC group refrigerant from the condenser is supplied,
- an accumulator disposed in a refrigerant pipe for feeding refrigerant from a low pressure side device to said compressor,
- a sight glass capable of observing the flow state of the refrigerant in a refrigerant pipe for taking out HFC group liquid refrigerant from said liquid receiver and feeding it to a low pressure side device, and
- a liquid injection line for injecting liquid refrigerant flowing in a refrigerant pipe upstream of said sight glass to a compressing chamber of said compressor, and a valve and an expansion instrument provided in said liquid injection line wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument, and
- said electromagnetic valve is controlled to be closed when said compressor is stopped.
6 more elements
A refrigerator having
- a compressor,
- a refrigerant pipe for circulating an HFC group refrigerant, selected from a group consisting of R404A and R507A, in a closed manner by said compressor,
- a condenser for condensing HFC group refrigerant discharged from said compressor,
- a liquid receiver to which HFC group refrigerant from the condenser is supplied,
- an accumulator disposed in a refrigerant pipe for feeding refrigerant from a low pressure side device to said compressor, and
- a liquid injection line for injecting a part of the liquid refrigerant in said refrigerant pipe downstream of said condenser to a compressing chamber in said compressor,
- wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument, and
- said electromagnetic valve is controlled to be closed when said compressor is stopped.
6 more elements
A refrigerator having
- a scroll compressor,
- a condenser,
- a first refrigerant pipe for feeding refrigerant from said compressor to said condenser,
- a liquid receiver to which refrigerant from said condenser is supplied,
- a second refrigerant pipe for feeding refrigerant from said condenser to a low pressure side device,
- a third refrigerant pipe for feeding refrigerant from said low pressure side device to said compressor, and
- a liquid injection line for injecting a part of the liquid refrigerant in said second refrigerant pipe downstream of said liquid receiver to a compressing chamber in said compressor,
- wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument,
- said electromagnetic valve is controlled to be closed when said compressor is stopped, and
- said refrigerant is an HFC group pseudo-azeotropic mixture refrigerant selected from the group consisting of R404A and R507A.
8 more elements
An air-cooled type condenser unit for a refrigerating apparatus comprising
- a scroll compressor,
- a condenser,
- a cooling fan for cooling said condenser,
- a first refrigerant pipe for feeding a refrigerant from said compressor to said condenser,
- a second refrigerant pipe for feeding refrigerant from said condenser toward a low pressure side device;
- and
- a liquid injection line for injecting liquid refrigerant flowing in said second refrigerant pipe downstream of said condenser to a compressing chamber of said scroll compressor, wherein
- said liquid injection line includes an electromagnetic valve and an expansion instrument,
- said electromagnetic valve being controlled to be closed when said compressor is stopped, and
- said refrigerant is an HFC group pseudo-azeotropic mixture refrigerant selected from the group consisting of R404A and R507A.
7 more elements
A refrigerator having
- a scroll compressor,
- a pipe for circulating an HFC group refrigerant, selected from a group consisting of R404A and R507A, in a closed manner by said scroll compressor,
- a condenser for condensing HFC group refrigerant discharged from said scroll compressor, and
- a liquid injection line for injecting liquid refrigerant flowing in a refrigerant pipe downstream of said condenser to a compressing chamber of said scroll compressor, and a valve and an expansion instrument provided in said liquid injection line, wherein
- said valve in said liquid injection line being controlled to be closed when said compressor is stopped.
2 more elements
Dependencies are inferred from the claim text.