Butterfly bypass valve, and throttle loss recovery system incorporating same

Patent metadata

Field	Value
Publication number	US-10358987-B2
Application number	US-201314387877-A
Country	US
Kind code	B2
Filing date	Apr 23, 2013
Priority date	Apr 23, 2012
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A butterfly bypass valve includes a housing defining a bypass flow passage with a pivotable throttle plate therein. An outer edge of the throttle plate in a closed position is in sealing engagement with a sealing portion of the housing such that the throttle plate restricts fluid flow through the bypass flow passage. The throttle plate is pivotable to an open position to allow fluid flow through the bypass flow passage. A port in the housing allows a portion of fluid passing through the bypass flow passage to be removed when the throttle plate is pivoted to the open position. A predetermined amount of pivoting of the throttle plate toward the open position can occur so as to allow flow through the port, while maintaining the edge of the throttle plate in substantially sealing engagement with the sealing portion so as to substantially prevent flow through the bypass passage.

First claim

What is claimed is:

1. A butterfly bypass valve, comprising:
a housing defining a bypass flow passage therethrough;
a throttle plate disposed in the bypass flow passage, the throttle plate being pivotable about a pivot axis oriented transverse to a flow direction through the bypass flow passage, an outer peripheral edge of the throttle plate being in substantially sealing engagement with a sealing portion of an inner surface of the housing when the throttle plate is in a closed position such that the throttle plate substantially restricts fluid flow through the bypass flow passage, the throttle plate being pivotable to an open position in which portions of the edge of the throttle plate are spaced from the inner surface to allow fluid flow through the bypass flow passage; and
a port defined through the housing for allowing a portion of fluid passing through the bypass flow passage to be removed through the port, the edge of the throttle plate restricting fluid flow into the port when the throttle plate is in the closed position, the port being uncovered to allow fluid flow into the port when the throttle plate is pivoted to the open position;
wherein said sealing portion of the inner surface of the housing in substantially sealing engagement with the edge of the throttle plate is configured to allow a predetermined amount of pivoting of the throttle plate toward the open position while maintaining the edge of the throttle plate in substantially sealing engagement with the sealing portion so as to restrict fluid flow through the bypass flow passage; and
wherein the port is located with respect to the sealing portion such that as the throttle plate is pivoted from the closed position toward the open position, the throttle plate begins to progressively uncover a first part of the port to allow fluid flow therethrough while the edge of the throttle plate is still in substantially sealing engagement with the sealing portion restricting fluid flow through the bypass flow passage, and wherein the port is located with respect to the sealing portion such that the throttle plate begins to allow flow through the bypass flow passage before the port is fully uncovered by the throttle plate.

2. The butterfly bypass valve of claim 1 , wherein the first part of the port widens in a direction of movement of the edge of the throttle plate.

3. The butterfly bypass valve of claim 2 , wherein the first part of the port transitions into a second part of the port having a generally constant width in the direction of movement of the edge of the throttle plate.

4. The butterfly bypass valve of claim 3 , wherein the second part of the port transitions into a third part of the port that narrows in the direction of movement of the edge of the throttle plate.

5. The butterfly bypass valve of claim 1 , wherein the housing further includes a return passage spaced from the port and extending into the bypass flow passage, through which fluid removed from the bypass flow passage via the port is returned to the bypass flow passage.

6. The butterfly bypass valve of claim 1 , further comprising a single actuator coupled with the throttle plate and operable for pivoting the throttle plate so as to control flow through both the bypass flow passage and the port.

7. A throttle-loss recovery system for an internal combustion engine, comprising:
a turbine/generator unit comprising a turbine connected to an electrical generator, air passing through the turbine being throttled and expanded by the turbine before the air is supplied to an intake of the engine, the turbine driving the generator to produce electrical power; and
a butterfly bypass valve arranged in parallel to the turbine of the turbine/generator unit, the valve comprising:
a housing defining a bypass flow passage allowing air destined for the intake to bypass the turbine;
a throttle plate disposed in the bypass flow passage, the throttle plate being pivotable about a pivot axis oriented transverse to a flow direction through the bypass flow passage, an outer peripheral edge of the throttle plate being in substantially sealing engagement with a sealing portion of an inner surface of the housing when the throttle plate is in a closed position such that the throttle plate substantially restricts air flow through the bypass flow passage, the throttle plate being pivotable to an open position in which portions of the edge of the throttle plate are spaced from the inner surface to allow air flow through the bypass flow passage; and
a port defined through the housing for allowing a portion of air passing through the bypass flow passage to be removed through the port, the edge of the throttle plate restricting air flow into the port when the throttle plate is in the closed position, the port being arranged to feed air to the inlet of the turbine when the throttle plate is pivoted to uncover the port;
wherein said sealing portion of the inner surface of the housing in substantially sealing engagement with the edge of the throttle plate is configured to allow a predetermined amount of pivoting of the throttle plate toward the open position while maintaining the edge of the throttle plate in substantially sealing engagement with the sealing portion so as to restrict air flow through the bypass flow passage; and
wherein the port is located with respect to the sealing portion such that as the throttle plate is pivoted from the closed position toward the open position, the throttle plate begins to progressively uncover a first part of the port to allow air flow therethrough while the edge of the throttle plate is still in substantially sealing engagement with the sealing portion restricting air flow through the bypass flow passage, and wherein the port is located with respect to the sealing portion such that the throttle plate begins to allow flow through the bypass flow passage before the port is fully uncovered by the throttle plate.

8. The throttle-loss recovery system of claim 7 wherein the first part of the port widens in a direction of movement of the edge of the throttle plate.

9. The throttle-loss recovery system of claim 8 , wherein the first part of the port transitions into a second part of the port having a generally constant width in the direction of movement of the edge of the throttle plate.

10. The throttle-loss recovery system of claim 9 , wherein the second part of the port transitions into a third part of the port that narrows in the direction of movement of the edge of the throttle plate.

11. The throttle-loss recovery system of claim 7 , wherein the housing further includes a return passage spaced from the port and extending into the bypass flow passage, the return passage being connected to the exit of the turbine such that air removed via the port and supplied to the turbine is returned to the bypass flow passage after the air has passed through the turbine.

Assignees

• Honeywell Int Inc
• Garrett Transportation I Inc

Inventors

• Reyenga James William
• Guidry Mike
• Beresewicz Patrick

Classifications

• F02D2009/0201

  Arrangements; Control features; Details thereof · CPC title

• F05D2220/62

  with energy recovery turbines · CPC title

• F02D9/1015 Primary

  Details of the edge of the flap, e.g. for lowering flow noise or improving flow sealing in closed flap position · CPC title

• F02D9/10 Primary

  having pivotally-mounted flaps · CPC title

• F05D2220/40

  in turbochargers · CPC title