Refrigeration – Refrigeration producer – Compressor-condenser-evaporator circuit
Reexamination Certificate
2003-12-23
2004-09-21
Jiang, Chen Wen (Department: 3744)
Refrigeration
Refrigeration producer
Compressor-condenser-evaporator circuit
C062S502000, C062S512000, C062S471000
Reexamination Certificate
active
06792773
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to a collector for the liquid phase of the working medium of an air conditioning system, having a first and second connecting pipes provided for connection into the circuit of the air conditioning system. A guide tube is connected to the second connecting pipe and is guided through the interior of the container, so that part of the guide tube runs through the bottom region of the container, which is provided for vertical arrangement, and its open end is situated in the upper region of the container. That part of the guide tube which runs through the bottom region has at least one opening for recycling collected oil and the liquid phase of the working medium into the working medium circulating through the air conditioning system.
A collector of this type is disclosed by German publication DE 19842019 A1. This collector has the disadvantage of not being suitable for an air conditioning system with an optional heat pump mode since, during the required reversal of the direction of flow, said collector prevents collected oil from being recycled into the circuit of the air conditioning system. This results from the fact that medium flowing out from the guide tube into the container discards its oil fraction in the container before it can be taken up by the outlet connecting pipe. The accumulation of oil which is therefore possible in the collector brings the risk of the compressor of the air conditioning system failing due to lack of oil.
German publication DE 2650935 C3 discloses a centrifugal separator for a refrigerator, having a multipart, vertically orientated housing in which there is arranged, from the top downward, first of all a cylindrical, then a conical separating space and finally a liquid collecting space. An inlet connecting pipe and, in the direction of the vertical axis, a dip tube which merges into a suction gas duct lead tangentially into the cylindrical separating space. Cleaning of the refrigerant takes place by separating off liquid and particles along a defined flow path. A reversal of the direction of flow is neither envisaged nor possible.
One object of this invention is the object of finding a collector which ensures that oil is discharged from the liquid phase even if the direction in which the flow passes through the container is reversed, and which also has an improved separating effect for separating off the liquid phase of the medium.
The above mentioned object is achieved according to the invention by a device having the features of claim
1
. In this case, in order to separate off the liquid phase, a cyclone-like separating device having a cyclone chamber and having a central outflow connecting pipe forming an overflow is provided, into which one of the connecting pipes leads tangentially, with the open end of the guide tube ending at a distance on the same axis before this outflow connecting pipe, so that when the flow through the collector passing from the second connecting pipe via the guide tube to the cyclone chamber is reversed, the liquid phase and oil can be driven out of the collector via the hole and the tangential connecting pipe.
The invention will be explained in greater detail below with reference to two exemplary embodiments illustrated in the drawings.
REFERENCES:
patent: 3411319 (1968-11-01), Thompson et al.
patent: 3877904 (1975-04-01), Lowrie
patent: 4142380 (1979-03-01), Dyhr et al.
patent: 4506523 (1985-03-01), DiCarlo et al.
patent: 5347817 (1994-09-01), Kim
patent: 5551255 (1996-09-01), Rothfleisch
patent: 5850743 (1998-12-01), Dreiman et al.
patent: 6062039 (2000-05-01), Haramoto et al.
Kuhn Peter
Obrist Frank
Crowell & Moring LLP
Daimler-Chrysler AG
Jiang Chen Wen
LandOfFree
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