Patent GB-425403-A (GB)
Abstract: 425,403. Regulating delivery of pumps. RAY BURNER CO., 401, Bernal Avenue, San Francisco, U.S.A.-(Assignees of Neubauer, E. ; 4804, N. E. Davis Street, Portland, Oregon, U.S.A.) July 10, 1933, No. 19569. Convention date, July 9, 1932. [Class 102 (i)] [See also Groups XI, XXVI, and XXIX] A fluid supply system such as a system for supplying liquid fuel to burners comprises a plurality of branch conduits, one branch conduit being for the delivery of a desired quantity of the fluid and another one being for the return of excess fluid to the source of supply, both these conduits containing restricted passageways in which the fluid flows in accordance with Poiseuille's law so as to prevent changes in viscosity of the fluid from affecting the rate of discharge of the fluid from the system. Fig. 1 shows a constant volumetric discharge pump 3 delivering fuel from a reservoir 2 through a branch 8 to a burner 6, the excess fuel being returned to the reservoir 2 through a branch 7. The branch 8 includes one or more Poiseuille tubes 9 arranged in parallel and the branch 7 includes one or more Poiseuille tubes 11 arranged in parallel, the Poiseuille tubes being of such dimensions that the pressure differences between their ends A, A<1> and B, B<1> are from 10 to 15 times the back pressures developed in the system beyond the points A<1>, B<1>. The tubes 9, 11 may be replaced by a valve, Fig. 3, in which a Poiseuille passageway 37 is formed between a tapered plug 31 on an adjustable spindle 32 and a tubular member 28. The plug 31 is maintained centrally in the passageway by pins 39 engaging the tubular member 28. Fig. 4 shows a burner supply system embodying such valves 59, 63 in the byepass branch 58 and the delivery branch 61 leading to the burner 62. The proportionate flow between the branches may be varied by adjustment of the valves, but is not affected by the fuel viscosity. A branch 67 containing a safety valve 68 connects the delivery side of the pump 54 with the fuel reservoir to prevent a dangerous rise of pressure in the system and a branch 64 containing a valve 66 allows a low frame to be obtained. Fig. 5 shows an alternative form of valve comprising a tubular chamber 81 having inlet and outlet supplies 84, 85 and containing an adjustable spring-pressed plug 86 formed on its outer surface with a gradually tapered helical passageway 87 in which the flow will be according to Poiseuille's law. Figs. 8 and 10 show the preferred form of unit in which liquid fuel is supplied by a constant volumetric discharge pump 106 from a tank 104 connected to the main supply tank to a chamber 102 containing two tapered tubes 116 each fitted with an adjustable tapered plug member 118 so as to leave a Poiseuille passage 119. Fuel can flow from the chamber 102 through one passage 119 and a passage 133 to the burner and through the other passageway 119 and a passage 136 back to the tank 104. Fuel can also flow from the chamber 102 to the tank 104 through a spring-pressed valve 143 if its pressure becomes excessive and through an adjustable valve 147 if a low flame is desired. The tubes 116 are considerably longer than the members 118 so that adjustment of the members 118 does not affect the effective lengths of the passages 119. Examples of suitable dimensions of the various parts for different outputs are stated in the Specification.