Aspirators for producing vacuum using the Venturi effect

Patent metadata

Field	Value
Publication number	US-9827963-B2
Application number	US-201414294727-A
Country	US
Kind code	B2
Filing date	Jun 3, 2014
Priority date	Jun 11, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Aspirators are disclosed herein that include a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section and have a suction port in fluid communication with the Venturi gap. The converging motive section defines a circular-shaped motive inlet and defines an elliptical- or polygonal-shaped motive outlet, and the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet. In one embodiment, the converging motive section defines an inner passageway that transitions as a hyperbolic function from the circular-shaped motive inlet to the elliptical- or polygonal-shaped motive outlet and the elliptical- or polygonal-shaped motive outlet has an area that is less than the area of the circular-shaped motive inlet.

First claim

What is claimed is:

1. An aspirator comprising:
a body having a converging motive section and a diverging discharge section aligned end to end and having an outlet end of the converging motive section facing an inlet end of the diverging discharge section to collectively define a Venturi gap therebetween; and
a suction port in fluid communication with the Venturi gap;
wherein the converging motive section defines a circular-shaped motive inlet and defines an elliptical- or polygonal-shaped motive outlet, and wherein the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet;
wherein the motive outlet is dimensionally smaller than the discharge inlet, and the offset ratio is greater than 0.28, the offset ratio being:
(discharge inlet area−motive outlet area)/peak motive flow rate* k 1,

where k1=c*D fluid , and c is the speed of sound and D fluid is the density of fluid at the motive outlet end.

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

3. The aspirator of claim 1 , wherein the converging motive section defines an inner passageway that transitions as a hyperbolic function from the circular-shaped motive inlet to the elliptical- or polygonal-shaped motive outlet, and wherein the elliptical- or polygonal-shaped motive outlet has an area that is less than the area of the circular-shaped motive inlet.

4. The aspirator 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.

5. The aspirator 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.

6. The aspirator of claim 1 , wherein the elliptical- or polygonal-shaped motive outlet has an eccentricity of between 0 to, and including 1.

7. The aspirator 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.

8. The aspirator of claim 1 , wherein the Venturi gap is proportional to the (motive mass flow rate) n , wherein n is 0.25 to 0.8.

9. The aspirator of claim 1 , wherein the Venturi gap is proportional to the (motive mass flow rate) n , wherein n is 0.4 to 0.6.

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

11. The aspirator of claim 10 , wherein the elliptical- or polygonal-shaped motive outlet has an eccentricity of between 0.4 to, and including 0.97.

12. An aspirator comprising:
a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section; and
a suction port in fluid communication with the Venturi gap;
wherein the converging motive section defines a circular-shaped motive inlet and defines an elliptical- or polygonal-shaped motive outlet, and wherein the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet,
wherein the motive outlet and discharge inlet are offset from one another, and the offset between the motive outlet and the discharge inlet is proportional to the (motive mass flow rate) n , wherein n is 0.25 to 0.8.

13. The aspirator of claim 12 , wherein the offset between the motive outlet and the discharge inlet is proportional to the (motive mass flow rate) n , wherein n is 0.4 to 0.6.

14. An aspirator comprising:
a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section;
wherein the converging motive section defines an internal passageway formed by hyperboloid curves connecting a motive inlet to the motive outlet; and
wherein the motive outlet and the discharge inlet each have an elliptical or polygonal internal cross-section having an eccentricity of between 0 to, and including 1, and the discharge inlet is offset relative to the motive outlet by a value proportional to the (motive mass flow rate) n , where n is 0.25 to 0.8.

15. The aspirator of claim 14 , wherein n is 0.4 to 0.6.

16. A Venturi device comprising:
a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section, the motive section having a motive inlet and a motive outlet having different shapes relative to one another;
wherein the converging motive section defines an internal passageway formed by hyperboloid curves connecting a motive inlet to the motive outlet; and
wherein the motive outlet has an area that is less than the area of the motive inlet:
wherein the motive outlet has a ratio of a major axis to a minor axis of 2 to 4; and
wherein a discharge inlet of the diverging discharge section is offset, relative to the motive outlet, by a ratio of the difference of a discharge inlet area and a motive outlet area to a 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.

17. A Venturi device comprising:
a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section; and
a suction port in fluid communication with the Venturi gap;
wherein the converging motive section defines a circular-shaped motive inlet and defines an elliptical- or polygonal-shaped motive outlet, and wherein the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet;
wherein the converging motive section defines an inner passageway that transitions as a hyperbolic function from the circular-shaped motive inlet to the elliptical- or polygonal-shaped motive outlet, and wherein the elliptical- or polygonal-shaped motive outlet has an area that is less than the area of the circular-shaped motive inlet.

18. A Venturi device comprising:
a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section; and
a suction port in fluid communication with the Venturi gap;
wherein the converging motive section defines a circular-shaped motive inlet and defines an elliptical- or polygonal-shaped motive outlet, and wherein the diverging discharge section defines an elliptical- or polygonal-shaped discharge inlet;
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.

19. A Venturi device comprising:
a body defining a Venturi gap between an outlet end of a converging motive section and an inlet end of a diverging discharge section; and
a suction port in fluid communication with the Venturi gap;
wherein the converging motive section defines a circular-shaped motive inlet and defines an elliptical- or polygonal-shaped motive outlet, and where

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

• B60T13/52 Primary

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

• B60T17/02

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

• Y10T137/87587

  Combining by aspiration · CPC title