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LEAF SPRING ADJUSTABLE VANE NOZZLE

IP.com Disclosure Number: IPCOM000248090D
Publication Date: 2016-Oct-25
Document File: 5 page(s) / 99K

Publishing Venue

The IP.com Prior Art Database

Abstract

A design for a nozzle ring for radial inflow turbines with adjustable throat area is disclosed. The design includes a leaf spring adjustable vane nozzle. The nozzle enables varying a flow function of the turbine and raising power and pressure for low flow rates by closing a nozzle throat, whereas allows more flow passing through at lower pressure by opening the nozzle throat. The proposed leaf spring adjustable vane nozzle design when used in a turbocharger enables higher engine power and lower emissions, while for an industrial gas expander such a nozzle increases power generation when process conditions vary.

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LEAF SPRING ADJUSTABLE VANE NOZZLE

BACKGROUND

The present invention relates generally to variable geometry turbines and more particularly to a nozzle ring design with improved reliability and long lifetime.

Generally, variable geometry turbines are used for turbochargers to improve efficiency and emissions of engines. The variable geometry turbines enables such improvement by providing more boost over a wider range of operating conditions than that provided by a fixed geometry turbine. The variable geometry turbines also enable higher flow or lower backpressure without a wastegate, while delivering sufficient air at low loads. In fact, such turbochargers may be the largest single leap towards meeting critical emission and fuel consumption targets. However, cost and reliability have hampered widespread adoption.

Variable geometry nozzles are also used for industrial turbines in expanding various gases and help to maintain inlet pressure or desired power and speed when process conditions vary. An example are expanders for organic Rankine cycles or power recovery from natural gas, where flow rate and power generation control relies on inefficient throttle and bypass valves unless variable nozzles are used.

A conventional technique uses pivoting vanes, which are expensive to manufacture and integrate with individual hinges and levers. The pivoting vanes also face reliability and lifetime issues.

Another conventional technique uses a configuration including moveable shroud. The moveable shroud covers part of an impeller inlet area, which is used in truck turbochargers. The moveable shroud reduces the number of moving parts and complexity. However, such a configuration reduces efficiency as the moveable shroud adversely affects a nozzle and impeller tip aerodynamics.

Therefore, it would be desirable to have a nozzle ring design with improved reliability and long lifetime.

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BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts a cross sectional view of a leaf spring adjustable vane nozzle design.

Figure 2 depicts a cross sectional three dimensional view of a rigid vane ring section.

. Figure 3 depicts a three dimensional view of a leaf spring blade ring.

Figure 4 depicts a cross sectional view of assembled nozzle design in a turbocharger.

Figure 5 depicts a radial outside view of a nozzle ring with one vane pair that includes a leaf spring vane and a rigid vane.

DETAILED DESCRIPTION

A design for a nozzle ring for radial inflow turbines with adjustable throat area is disclosed. The design includes a leaf spring adjustable vane nozzle. The nozzle enables varying a flow function of the turbine and raising power and pressure for low flow rates by closing a nozzle throat, whereas allows more flow passing through at lower pressure by opening the nozzle throat. The proposed leaf spring adjustable vane nozzle design when used in a turbocharger enables higher engine power and lower emissions, while for an industrial gas expander such a nozzle increases power gener...