Ejector with check valve
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorTenghua Tom Shieh
Life of this patent
Estimating the term…
Abstract
PCV systems are well known in the art and commonly used in turbocharged engines. The ejector creates a pressure drop for additional pull of PCV gas under boosted conditions of the turbocharger engine. The ejector typically includes a first inlet and a second inlet and a sole outlet. The first inlet pulls air from the compressor of the PCV system. The second inlet pulls air from the cyclone separator of the PCV system. Air exiting the ejector is exited to the intake manifold. However, when the turbocharger of the system is off, fresh air can leak in from the inlet from the oil separator thereby preventing the ventilation of blowby. The unwanted air reduces the efficiency of the turbocharger system. Accordingly, an ejector preventing unwanted fresh air flow is needed in the art.
Claims12
A check valve for use in a turbocharger, the valve comprising:
- an ejector having an inlet for receiving air from a compressor, a passageway for receiving air from an oil separator and an outlet for ejecting air, the passageway fluidly connected to the outlet;
- a subassembly movable within the ejector having a first spool, a second spool, a nozzle and a spring, the first spool having an outer edge, the spring positioned between the first spool and the second spool;
- a first position defined when the spring biases the first spool and second spool to a closed position where the outer edge of the first spool rests adjacent the passageway and fully covers the passageway;
- a second position defined when the outer edge of the first spool is positioned away from the passageway to allow air to flow into the passageway, the second position further defined where the subassembly is moved from a rearward to a forward position to compress the spring, the outer edge moved to the second position by means of air pressure received from the compressor.
An assembly comprising:
- a turbocharger engine;
- a turbocharger ejector having an inlet for receiving air from a compressor of the turbocharger engine, a passageway for receiving air from an oil separator and an outlet for ejecting air;
- a subassembly movable within the turbocharger ejector having a first spool, a second spool, a nozzle body and a spring, the first spool having an outer edge, the spring positioned between the first spool and the second spool, the nozzle body having a smaller diameter than the first spool, the spring positioned around the outside of the nozzle body;
- a first position defined when the outer edge of the spool rests adjacent the passageway and fully covers the passage, the first position further defined when the spring biases the first spool and the second spool;
- a second position defined when the outer edge of the spool is positioned away from the passageway, the second position further defined where the subassembly is moved from a rearward to a forward position to compress the spring, the outer edge moved to the second position by means of air pressure received from the compressor.
Dependencies are inferred from the claim text.