Bottom seated pintle nozzle

Details Bottom seated pintle nozzle Bottom seated pintle nozzle

1997-05-05

1998-12-29

Weldon, Kevin

Fluid sprinkling, spraying, and diffusing

Processes

Of fuel injection

2395339, F02M 308

Patent

active

058531246

ABSTRACT:
A pintle nozzle, preferably an unthrottled pintle nozzle, is provided in which a negative interference angle is formed between the conical tip of the nozzle needle and the mating conical valve seat so that the needle seat is located at the bottom of the valve seat rather than at the top. The resulting nozzle lacks any velocity drop downstream of the needle seat, even at very low needle lifts, so that virtually all of the energy used to pressurize the fuel is converted to kinetic energy. Spray dispersion and penetration at low needle lifts therefore are significantly enhanced. Fuel flow through the converging-diameter discharge passage located between the conical needle tip and conical needle seat also self-centers the nozzle needle at low lifts, thereby helping to assure a symmetric spray and to further enhance spray characteristics. These and other advantages render the nozzle particularly useful for applications which require very small injection quantities such as the injection of fuel into small two-stroke gasoline engines or into pilot-ignited gas-fueled engines.

REFERENCES:
patent: 1690893 (1928-11-01), Dorner
patent: 2017028 (1935-10-01), Heinrich et al.
patent: 3830433 (1974-08-01), Miyake et al.
patent: 4524914 (1985-06-01), Kaibara et al.
patent: 5211340 (1993-05-01), Yoshizu
patent: 5392745 (1995-02-01), Beck
"A Study on a New Combustion System for D.I. Diesel Conical Spray Combustion System"; Z. Yuanxian et al., Chinese Society for the I.C. Engine Paper No. 871025, pp. 1-16.
"Effects of Fuel Injection on Diesel Combustion"; Beck et al., Paper No. 880299, BKM, Inc, pp. 1-28.
"Injection Rate Shaping and High Speed Combustion Analysis-New Tools for Diesel Engine Combustion Development"; Beck et al., SAE International, Paper No. 900639, pp. 1-18.
"Factors that Affect BSFC and Emissions for Diesel Engines: Part II Experimental Confirmation of Concepts Presented in Part I"; Beck et al., pp. 1-20.
"Peripheral Equipment for Diesel Fuel-Injection Systems"; Dr. -Ing. K.-O Riesenberg et al., pp. 192-196.

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