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Refrigerated filter assembly and method of using same
| Details |
Inventors: Pefley, Richard K.; Pullman, J. Barrett;
Assignee: Prodatek Corporation (Portola Valley, CA)
Primary Examiner: Capossela; Ronald C.
Assistant Examiner:
Attorney, Agent or Firm: Limbach, Limbach & Sutton
The present invention is a self-aided refrigerated filter assembly and method for its use for filtration of liquid petroleum gas (LPG) so that a liquid phase is maintained during the filtration process and that the LPG is sufficiently subcooled to suppress the formation bubbles to prevent the risk of vapor lock or cavitation damages to a pump downflow from the filtration process and/or to provide liquid for metering purpose. |
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DETAILED DESCRIPTION OF THE DRAWINGS Referring to FIGS.
1 and 2, the apparatus and method of the invention will be described.
A saturated liquid, such as LPG, is normally subject to storage in a tank.
When it is desired to use the LPG, it must be removed from the tank, filtered, and transferred for use.
The disclosure hereinafter when it refers to LPG is describing saturated liquid that is used for the preferred embodiment of the invention.
However, other saturated liquids or refrigerants can be substituted for LPG and not prevent practicing of the invention.
Referring to FIG.
1, a pressure-enthalpy graph is shown.
The property of enthalpy is the thermodynamic potential of a system.
In this case the system contains a saturated liquid.
Enthalpy is expressed by the following formula: H=U+pV, where U is the internal energy of the system, p is the pressure and V the specific volume.
The state (or phase) of the saturated liquid is dependent on the temperature of the saturated liquid at a given pressure.
Referring to FIG.
2, the assembly includes fuel filter housing 12, heat sink 18, flow control solenoid 24, and a pump (not shown).
Their interaction will be hereafter described in detail so as to disclose the apparatus and method of the invention.
Fuel filter housing has LPG inlet 14 connected to the top surface.
The filter housing has contained therein conventional filter elements of any standard type used for filtering liquids such as LPG.
The fuel filter housing 12 is situated so that LPG, once filtered, can pass into heat sink 18.
The heat sink 18, to which the fuel filter housing 12 is integrally connected in the primary embodiment, is configured for the purposes of allowing the LPG to flow through it and for heat removal from the assembly.
For this purpose, the LPG inlet passage 20 is aligned with outlet 16 of the fuel filter housing.
Disposed from and in fluid communication with passage 20 within heat sink 18 is passage 22.
Passage 22 is for outflow of the LPG from the heat sink.
An opening (or bore) 21 having upper area 23 is disposed in the heat sink
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Heat Accumulators 
