Fuel injection system
AssigneeSulzer Brothers Limited
InventorAnton Steiger
Life of this patent
Estimating the term…
Abstract
The fuel injection system employs a relief valve which is connected to the fuel chamber in the injection valve containing the primary fuel. The relief valve opens towards the end of the primary fuel injection phase to connect the fuel chamber to a discharge duct. Further, the relief valve permits a flushing of the fuel chamber after a changeover from operation with a coal slurry suspension to operation with diesel oil as the primary fuel. A selector valve, a pair of three way valves and multiple reservoirs are provided to accommodate switching over of operation from coal slurry to diesel oil.
Claims16
A fuel injection system for a combustion chamber of a reciprocating internal combustion engine comprising
- a first injection valve having a plurality of spray openings for injecting a primary fuel into the combustion chamber, a valve seat and a valve needle seated on said valve seat and movable from said valve seat during an injection phase to control flow from a fuel chamber about said valve needle through said spray openings;
- a second injection valve having at least one spray opening for injecting an ignition oil into the combustion chamber and a valve needle for controlling flow through said one spray opening;
- an accumulator chamber for receiving ignition oil at an injection pressure at least equal to an injection pressure of the primary fuel, said chamber being in communication with said second injection valve for delivering ignition oil to said one spray opening;
- a supply duct communicating with said first injection valve for delivering primary fuel thereto;
- a cylinder in said supply duct to receive primary fuel therein;
- a hydraulically operated piston in said cylinder for expelling primary fuel from said cylinder into said first injection valve for injection from said plurality of spray openings during said injection phase;
- a relief valve communicating with said fuel chamber of said first injection valve, said relief valve being selectively disposed in one of a closed position to block a said fuel chamber and an open flow of primary fuel from position towards an end of said injection phase thereof to exhaust a flow of primary fuel from said fuel chamber;
- and
- a discharge duct extending from said relief valve for discharging primary fuel from said relief valve.
A fuel injection system for a combustion chamber of a reciprocating internal combustion engine comprising
- a first injection valve having a plurality of spray openings for injecting a primary fuel containing a suspension of solid fuel particles into the combustion chamber and a fuel chamber upstream of said openings;
- a second injection valve having at least one spray opening for injecting diesel oil into the combustion chamber for ignition of the primary fuel;
- an accumulator chamber for receiving diesel oil at an injection pressure at least equal to an injection pressure of the primary fuel, said chamber being in communication with said second injection valve for delivering diesel oil to said one spray opening;
- a supply duct communicating with said first injection valve for delivering primary fuel to said fuel chamber;
- a cylinder in said supply duct to receive primary fuel therein;
- a hydraulically operated piston in said cylinder for expelling primary fuel from said cylinder into said fuel chamber of said first injection valve for injection from said plurality of spray openings during said injection phase;
- a relief valve communicating with said fuel chamber of said first injection valve, said relief valve being selectively disposed in one of a closed position to block a flow of primary fuel from said fuel chamber and an open position towards an end of said injection phase thereof to exhaust a flow of primary fuel from said fuel chamber;
- and
- a discharge duct extending from said relief valve for discharging primary fuel from said relief valve.
A fuel injection system as set forth in claim 14 wherein said first injection valve includes a valve seat upstream of said spray openings and a valve needle seated on said valve seat and which further comprises a piston pump communicating with said piston to deliver pressurized diesel oil to said piston for moving said piston to expel primary fuel from said cylinder to said first injection valve and communicating with an end of said valve needle to deliver pressurized diesel oil thereto for biasing said valve needle toward said valve seat and against the pressure of the primary fuel during said injection phase.
Dependencies are inferred from the claim text.