US 5,813,249 AGranted

Refrigeration cycle

AssigneeDenso Corporation

InventorsHiroki Matsuo, Kaoru Tsuzuki

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Abstract

A refrigeration apparatus is constructed by connecting a sight glass via a refrigerant pipe at a downstream side of a supercooling unit of an integrated type condenser-receiver. A required capacity VR of a receiver is obtained by subtracting a required capacity V3 for making the sight glass bubble-free from a total of a refrigerant fluctuation buffer amount V1 for accounting differences in the operating conditions of the refrigeration cycle, and an extra capacity to account for leakage of refrigerant from the refrigeration cycle. Therefore, even when the capacity of receiver is reduced by the required capacity V3 for making the sight glass bubble free, gaseous refrigerant containing bubbles flowing from the receiver are all liquified at the supercooling unit and gaseous refrigerant will never reach the sight glass as long as the refrigeration cycle is filled with the sufficient quantity of refrigerant.

Claims22

Dependent claims

A refrigeration apparatus comprising:

a compressor for compressing refrigerant;
a condenser of volume capacity VCOND1, said condenser having a plurality of condensing tube members for condensing said refrigerant that flows therein from said compressor and a converging member of volume capacity Vh1 for converging said refrigerant that flows therein from said plurality of condensing tube members;
a receiver of required volume capacity VR for separating said refrigerant from said converging member of said condenser into gaseous refrigerant and liquid refrigerant and discharging said liquid refrigerant;
a supercooler of volume capacity VCOND2, said supercooler having a distributing member of volume capacity Vh2 for distributing said refrigerant discharged by said receiver and a supercooling tube member of volume capacity VSC for supercooling said refrigerant that flows therein from said refrigerant distributing member;
a thermostatic expansion valve for expanding said refrigerant that flows therein;
and
an evaporator of volume capacity VEVA for evaporating said refrigerant that flows therein from said thermostatic expansion valve,
wherein said VR satisfies the following relationship:
VR=L.times.(V1+V2-V3) cc,
in which
V1=1.52.times.10.sup.-3 .times.(VCOND1+VCOND2)+34.3.times.10.sup.-3 .times.VEVA cc,
V2=170 cc,
V3=0.65.times.(Vh1+Vh2+VSC) cc and
L is a predetermined coefficient.
2.

12 more elements

A refrigeration apparatus comprising:

a compressor for compressing refrigerant;
a condenser of volume capacity VCOND1, said condenser having a plurality of condensing tube members for condensing said refrigerant that flows therein from said compressor and a converging member of volume capacity Vh1 for converging said refrigerant that flows therein from said plurality of condensing tube members;
a receiver of required volume capacity VR for separating said refrigerant from said converging member of said condenser into gaseous refrigerant and liquid refrigerant and discharging said liquid refrigerant;
a supercooler of volume capacity VCOND2, said supercooler having a distributing member of volume capacity Vh2 for distributing said refrigerant that flows therein from said receiver and a supercooling tube member of volume capacity VSC for supercooling said refrigerant distributed by said refrigerant distributing member;
a first thermostatic expansion valve for expanding said refrigerant that flows therein;
a second thermostatic expansion valve connected in parallel with said first thermostatic expansion valve for expanding said refrigerant that flows therein;
a first refrigerant evaporator of volume capacity VFEVA for evaporating said refrigerant that flows therein from said first thermostatic expansion valve;
a second refrigerant evaporator of volume capacity VREVA connected in parallel with said first refrigerant evaporator for evaporating said refrigerant that flows therein from said second thermostatic expansion valve;
a refrigerant pipe coupled to said second thermostatic expansion valve;
and
a switching valve provided in said refrigerant pipe for opening and closing said refrigerant pipe,
wherein VR satisfies the following relationship:
VR=L.times.(V1+V2-V3+V4) cc,
in which
V1=1.52.times.10.sup.-3 .times.(VCOND1+VCOND2)+34.3.times.10.sup.-3 .times.VFEVA cc,
V2=170cc,
V3=0.65.times.(Vh1+Vh2+VSC) cc,
V4=VP+6.5.times.10.sup.-2 .times.VREVA cc,
L is a predetermined coefficient and
VP is a capacity volume of said refrigerant pipe from said switching valve to said second thermostatic expansion valve.

17 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/909,378Filed 11 Aug 1997 · continuation
Priority: JP 7-18140718 Jul 1995
Granted: 29 Sep 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

B60H 1/3227
Using compression: characterised by the arrangement or the type of heat exchanger, e.g. condenser, evaporator
B60H 1/3229
Using compression: characterised by constructional features, e.g. housings, mountings, conversion systems
F25B 39/04
Evaporators; Condensers: condensers
F25B 41/006
Fluid-circulation arrangements: optical fluid control arrangements