Gas and liquid contact apparatus – Fluid distribution – Pumping
Patent
1998-12-22
2000-11-21
Chiesa, Richard L.
Gas and liquid contact apparatus
Fluid distribution
Pumping
137533, 261 691, 261DIG39, 261DIG68, F02M 1704
Patent
active
06149139&
ABSTRACT:
The invention relates to a membrane carburetor for an internal combustion engine in a portable handheld work apparatus such as a motor-driven chain saw. A throttle flap is arranged in the intake channel for the combustion air. The throttle flap is pivotally journalled downstream of a venturi section of the intake channel. A main nozzle for supplying fuel from a fuel-filled control chamber of the carburetor is provided in the region of the venturi section. The control chamber is delimited by a membrane which actuates a control valve controlling the fuel inflow into the control chamber. The main nozzle includes a check valve which includes a valve seat with a valve platelet assigned thereto. In order to avoid a dripping of the main nozzle even under unfavorable operating conditions, a sieve platelet is provided which effects an additional capillary sealing of the main nozzle during idle. The sieve platelet substantially completely covers the outlet cross section of the main nozzle downstream of the check valve.
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Andreas Stihl AG & Co.
Chiesa Richard L.
Ottesen Walter
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