IL32004A

IL32004A - Liquid trapping device

Info

Publication number: IL32004A
Application number: IL32004A
Authority: IL
Original assignee: Virginia Chemicals Inc
Priority date: 1968-07-05
Filing date: 1969-04-11
Publication date: 1971-12-29
Also published as: BE732265A; GB1261944A; ES366454A1; NO121957B; US3483714A; FR2012335A1; IE32879B1; NL6909706A; CH494382A; DE1928984A1; IL32004A0; IE32879L

Description

PATENTS LAW 1967 SPECIFICATION: LIQUIDS TRAPPING DEVICE Yaacov Salomon, Lipschutz & Co., (a) Title of Invention: LIQUID TRAPPING DEVICE . Inventors: Walter 0. Krause * 110 Poplar Hill Road ' ' Chesapeake, Virginia Kenneth W Rupert 1339 Oakes Street Marinette, Wisconsin b) Abstract of the Disclosure: Liquid trapping device of the type used for accumulating liquid intermediate the compressor and evaporator in a refrigerant vaporous return system. (c) Cross-References to Related Applications: None . (d) Background of the Invention: (1) Field of the Invention: The present device is designed to protect the compressor in a refrigerant system from the effects of liquid refrigerant returning to it.

' In liquid refrigerant systems and heat pumps, a basic problem consists in the unavoidable return of liquid refrigerant to the compresso Liquid refrigerant can cause the discharge valves to bre"ak in the. compressor, while diluting the oil in the compressor. The- resultant galling or seizing of bearings and other moving parts in the compressor directly affects compressor capability. refrigeration system. Inlet 26 is fed by conduit 20 extending from evsperater 16. .C©n£u£t 21 extends from outlet 28 to compressor 12 and conduit 22 extends from compressor 12 to condenser 11. The outlet fitting 33 M;'L is so designed as to serve as the outlet port 28 and bracket 30. It is a tubular device with a semi-circular opening in its side to permit the escape of refrigerant vapor. Eductor tube 32 is supported coaxially and inset with respect to outlet : 28 by means of bracket 30, so that the eductor tube bottom 35 is offset wi'th respect to'the chamber bottom 36. Eductor tube top 31 is inset with respect to the side walls of outlet 28 and outlet bottom 29. Bracket 30 includes a vertically downwardly extending semi-circular portion 33 which partiall encircles eductor tube 32, shielding the eductor top 31 and the outlet bottom 29 from inlet 26. > Applicants have found that by properly designing the outlet 28, the aforementioned prior art problems can be overcome. Instead of directing the refrigerant vapor directly into the outlet port 28, the ; outlet fitting of which port 28 is a part is so designed that the vapor must enter at a 90° angle to the vertical, axis of the accumulator tank. This creates a swirling action, as shown by directional arrows in FIG 2, in the liquid refrigerant which is trapped in the chamber bottom 36.

This being the case, the turbulence is reduced and almost all of the internal volume of the accumulator chamber 36 will trap liquid refrigerant This results in the use of a smaller volume for a given application, i giving economy to both space requirements and unit costs.

Furthermore, the swirling action of liquid refrigerant results in a decrease in the buffeting of the entering and leaving refrigerant vapor. A lower pressure loss is encountered, thereby increasing the jj operating efficiency of the refrigerating or air conditioning devices '· requiring one of these devices.

Since the outlet fitting or port 28 is so designed that the ref igerant vapor QntgtfS 6ΐ a 90° a gle to the hoei^ental axis of the accumulator, refrigerant vapor is "dead ended" at the bottom 36. Port 28 therefore can serve as a holder or mounting bracket for the oil pick up or eductor tube 32. This provides a very effective means of returning any trapped oil to the compressor 12.

The refrigerant vapor flows around the top 31 of the eductor tube 32, creating a Venturi action. This pulls trapped oil 'into the tube off of the bottom 36. The oil contains a certain amount of dissolvec refrigerant. The quantity of dissolved refrigerant is dependent upon the temperature-pressure relationship encountered and is, an equilibrium condition. When the oil-refrigerant solution enters eductor tube 32, a certain resistance to flow is encountered resulting in a slight jpressure loss in tube '32. This pressure loss will cause some of the 'dissolved refrigerant to leave the solution. The expanding refrigerant jjar.d the Venturi action will push the oil upward out of the tube 32 into the main stream of the refrigerant vapor to retur to the compressor 12.

In this manner, a very effective accumulator can be fabricated with economy in space and cost requirements and with efficient oil return to the compressor withouf significant penalty to system efficiency due to above. normal pressure losses.

Manifestly, "the dimensions of the accumulator chamber and the mode of supporting the eductor tube may be varied without departing from the spirit of invention.

Claims

WE Claim:

1. A liquid trapping device of the type used for accumulating liquid intermediate a compressor and an evaporator within a refrigerant system comprising: A) An accumulator chamber having a top and bottom with inlet and outlet ports supported in said top at right angles to the bottom of said -chamber so as to deadend refrigerant vapors · within said chamber; B) A bracket fitted to the top of said chamber and extending downwardly from the outlet port into the chamber, said bracket being integral with said outlet extending downwardly from the outlet within the chamber .. as a half-cylinder baffle having its open side opposed to the chamber wall and its enclosed side interposed between the outlet and inlet; and C) An eductor tube supported by said bracket coaxially inset with said outlet and extending from within said outlet to the bottom of said chamber. f.i/f

2. A liquid trapping device of the type used for accumulating liquid intermediate a compressor and an evaporator within a. refrigerant vapor return system comprising: A) An accumulator chamber having a top and bottom with inlet and outlet ports in said top, said 1 . ports being at right angles to the chamber bottom; B) fc A bracket fitted to the top of said chamber and extending as a half-cylinder downwardly frqm the outlet port into the chamber, the closed side of said half-cylinder being interposed between inlet and outlet ports and the open side of said cylinder being exposed to the chamber wall; and ' C) An eductor tube supported by said bracket coaxial ly inset within said outlet, spaced from the walls of said outlet and extending from within said outlet to the bottom of said chamber.