Aspirators for producing vacuum using the venturi effect

Patent metadata

Field	Value
Publication number	US-10336305-B2
Application number	US-201715791561-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Jun 11, 2013
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A Venturi device for producing vacuum from fluids in an engine system has a body defining a Venturi gap separating apart an outlet end of a converging motive section and an inlet end of a diverging discharge section by a lineal distance, and a suction port in fluid communication with the Venturi gap. The converging motive section and the diverging discharge section both gradually, continuously taper toward the Venturi gap, the converging motive section defines a circular-shaped motive inlet and an elliptical- or polygonal-shaped motive outlet, the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet, and an inner passageway of the converging motive section transitions as a hyperbolic function from the motive inlet to the elliptical- or polygonal-shaped motive outlet.

First claim

What is claimed is:

1. A Venturi device for producing vacuum from fluids in an engine system comprising:
a body defining a Venturi gap separating apart an outlet end of a converging motive section and an inlet end of a diverging discharge section by a lineal distance, wherein the converging motive section defines an inner passageway that tapers as a hyperbolic function from a circular-shaped motive inlet to an elliptical- or polygonal-shaped motive outlet and the diverging discharge section gradually, continuously tapers toward the Venturi gap; and
a suction port in fluid communication with the Venturi gap;
wherein the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet;
wherein the hyperbolic function provides flow lines at the motive outlet end being parallel to one another.

2. The Venturi device of claim 1 , wherein the diverging discharge section further defines a circular-shaped discharge outlet.

3. The Venturi device of claim 1 , wherein the suction port extends downward around the sides of the outlet end of the converging motive section and the sides of the inlet end of the diverging discharge section and defines a void between all sides thereof; and wherein the exterior profile of the outlet end of the converging motive section and the inlet end of the diverging discharge section generally match their respective internal shapes.

4. The Venturi device of claim 3 , wherein the inlet end of the diverging discharge section terminates with a rounded chamfer directing fluid flow into the elliptical- or polygonal-shaped discharge inlet.

5. The Venturi device of claim 1 , wherein the elliptical- or polygonal-shaped motive outlet has an eccentricity of 0.4 to 0.97.

6. The Venturi device of claim 1 , wherein the elliptical- or polygonal-shaped motive outlet has a ratio of a major axis to a minor axis of 2 to 4, and the elliptical- or polygonal-shaped discharge inlet is offset, relative to the elliptical- or polygonal-shaped motive outlet, by the ratio of the difference of the discharge inlet area and the motive outlet area to the peak motive flow rate ((discharge inlet area motive outlet area)/peak motive flow rate) times a constant is greater than 0.28, wherein the constant is equal to the speed of sound times the density of the fluid at the motive outlet.

7. The Venturi device of claim 1 , wherein the lineal distance is proportional to the (motive mass flow rate) n , wherein n is 0.25 to 0.8.

8. The Venturi device of claim 1 , wherein the lineal distance is proportional to the (motive mass flow rate) n , wherein n is 0.4 to 0.6.

9. The Venturi device of claim 8 , wherein the elliptical- or polygonal-shaped motive outlet has an eccentricity of between 0 to, and including 1.

10. The Venturi device of claim 1 , wherein an offset, a discharge inlet area minus the motive outlet area, is proportional to the (motive mass flow rate) n , wherein n is 0.25 to 0.8.

11. The Venturi device of claim 1 , wherein an offset, a discharge inlet area minus the motive outlet area, is proportional to the (motive mass flow rate) n , wherein n is 0.4 to 0.6.

12. The Venturi device of claim 1 , wherein a ratio of suction inlet area/suction outlet area is between 3 and 12, the ratio of motive inlet area/motive outlet area is greater than 4, and a ratio of discharge outlet area/discharge inlet area is greater than 4.

13. The Venturi device of claim 1 , wherein the body further comprises a bypass port intersecting the diverging discharge section downstream of the discharge inlet.

14. An engine system comprising:
a source of fluid pressure;
a device requiring vacuum;
an engine and an engine component; and
a Venturi device according to claim 1 ;
wherein the Venturi device has the suction port in fluid communication with the device requiring vacuum, the motive inlet in fluid communication with the source of fluid pressure, and a discharge outlet in fluid communication with the engine or the engine component.

15. The engine system of claim 14 , wherein the device requiring vacuum is a brake boost device, positive crankcase ventilation device, or fuel purge device.

16. The engine system of claim 14 , wherein the source of fluid pressure is in a range of 5 kPa to 60 kPa.

Assignees

• Fletcher Dave
• Graichen Brian
• Hampton Keith
• Gilmer Matt
• Niedert Andrew
• Dayco Ip Holdings Llc

Inventors

• Fletcher Dave
• Graichen Brian
• Hampton Keith
• Gilmer Matt
• Niedert Andrew

Classifications

• Y10T137/87587

  Combining by aspiration · CPC title

• B60T17/02

  Arrangements of pumps or compressors, or control devices therefor · CPC title

• B60T13/52 Primary

  indirect, i.e. vacuum booster units · CPC title