Crankcase ventilating evacuator

Patent metadata

Field	Value
Publication number	US-10100720-B2
Application number	US-201614989177-A
Country	US
Kind code	B2
Filing date	Jan 6, 2016
Priority date	Jan 9, 2015
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A turbocharged engine air system is disclosed. The system includes a vacuum consuming device, a turbocharger having a compressor fluidly connected to an intake manifold of an engine, a first check valve located upstream of the compressor, a second check valve located downstream of the compressor and upstream of the intake manifold, and an evacuator. The evacuator includes a converging motive section, a diverging discharge section, at least one suction port, and a Venturi gap located between an outlet end of the converging motive section and an inlet end of the diverging discharge section. The diverging discharge section of the evacuator is fluidly connected to both the first check valve and the second check valve. The suction port is fluidly connected to the vacuum consuming device.

First claim

What is claimed is:

1. A turbocharged engine air system, comprising:
a crankcase ventilation system having an oil mist separator;
a turbocharger having a compressor fluidly connected to an intake manifold of an engine;
a first check valve located upstream of the compressor and a second check valve located downstream of the compressor and upstream of the intake manifold; and
an evacuator, comprising:
a converging motive section, a diverging discharge section, at least one suction port, and a first Venturi gap located between an outlet end of the converging motive section and an inlet end of the diverging discharge section;
wherein the diverging discharge section of the evacuator comprises a plurality of additional Venturi gaps;
wherein the diverging section is fluidly connected to both the first check valve and the second check valve, and the suction port is fluidly connected to an outlet end of the oil mist separator;
wherein the first Venturi gap and the plurality of additional Venturi gaps are separated from one another such that the plurality of Venturi gaps do not draw air from one another and only draw air from the oil mist separator;

wherein the first check valve and the second check valve ensure that a pressure at the converging motive section of the evacuator is always greater than a pressure at the diverging discharge section.

2. The turbocharged engine air system of claim 1 , comprising a charge air cooler (CAC) located downstream from the compressor of the turbocharger.

3. The turbocharged engine air system of claim 2 , comprising a first engine air connection located upstream of the CAC and downstream of the compressor of the turbocharger and a second engine air connection is fluidly connected to the diverging discharge section of the evacuator.

4. The turbocharged engine air system of claim 3 , wherein a junction is located along the second engine air connection and is connected to the turbocharged engine air system at two discrete locations.

5. The turbocharged engine air system of claim 1 , wherein the plurality of Venturi gaps define a surface, and wherein the surface includes a substantially pointed profile.

6. The turbocharged engine air system of claim 1 , wherein the evacuator is constructed of a material that withstands temperatures of at least 200° C.

7. The turbocharged engine air system of claim 1 , wherein the evacuator is constructed of one of polyphenylene sulfide (PPS), a metallic material, and polypropylene.

8. A turbocharged engine air system, comprising:
a crankcase ventilation system having an oil mist separator with an outlet;
a turbocharger having a compressor fluidly connected to an intake manifold of an engine;
a first check valve located upstream of the compressor and a second check valve located downstream of the compressor and upstream of the intake manifold; and
an evacuator, comprising:
a converging motive section, a diverging discharge section, at least one suction port, and a first Venturi gap located between an outlet end of the converging motive section and an inlet end of the diverging discharge section, wherein the diverging discharge section of the evacuator comprises a plurality of additional Venturi gaps;
wherein the diverging discharge section is fluidly connected to both the first check valve and the second check valve, and the suction port is fluidly connected to the outlet of the oil mist separator of the crankcase ventilation system, and
wherein the first Venturi gap and the plurality of additional Venturi gaps define a surface, and the surface includes a substantially pointed profile;
wherein the first check valve and the second check valve ensure that a pressure at the converging motive section of the evacuator is always greater than a pressure at the diverging discharge section.

9. The turbocharged engine air system of claim 8 , comprising a charge air cooler (CAC) located downstream from the compressor of the turbocharger.

10. The turbocharged engine air system of claim 9 , comprising a first engine air connection located upstream of the CAC and downstream of the compressor of the turbocharger and a second engine air connection is fluidly connected to the diverging discharge section of the evacuator.

11. The turbocharged engine air system of claim 10 , wherein a junction is located along the second engine air connection and is connected to the turbocharged engine air system at two discrete locations.

12. The turbocharged engine air system of claim 8 , wherein the first Venturi gap and the plurality of additional Venturi gaps are separated from one another such that each Venturi gap does not draw air from any of the others and only draw air from the oil mist separator.

13. The turbocharged engine air system of claim 8 , wherein the evacuator is constructed of a material that withstands temperatures of at least 200° C.

14. The turbocharged engine air system of claim 8 , wherein the evacuator is constructed of one of polyphenylene sulfide (PPS), a metallic material, and polypropylene.

15. A Venturi device assembly, comprising:
an evacuator, comprising:
a converging motive section;
a diverging discharge section;
a first Venturi gap located between an outlet end of the converging motive section and an inlet end of the diverging discharge section,
a plurality of additional Venturi gaps in the diverging discharge section downstream of the first Venturi gap;
wherein the first Venturi gap and the plurality of additional Venturi gaps define a surface having a stepped configuration; and

an oil mist separator with an outlet connected to the surface having the stepped configuration, the outlet being in fluid communication with the first Venturi gap and the plurality of additional Venturi gaps.

16. The Venturi device assembly of claim 15 , wherein no check valve element is along the surface having the stepped configuration.

17. The Venturi device assembly of claim 15 , wherein the surface having the stepped configuration has a plurality of walls defining the first Venturi gap and the plurality of additional Venturi gaps; wherein a wall of greatest height is located between the first Venturi gap and a most downstream Venturi gap.

18. The Venturi device assembly of claim 17 , wherein the wall of greatest height is centrally position between the first Venturi gap and a most downstream Venturi gap.

Assignees

• Fletcher David E
• Graichen Brian M
• Miller James H
• Hampton Keith
• Dayco Ip Holdings Llc

Inventors

• Fletcher David E
• Graichen Brian M
• Miller James H
• Hampton Keith

Classifications

• F01M2013/027

  with a turbo charger or compressor · CPC title

• F01M2013/026

  with pumps sucking air or blow-by gases from the crankcase · CPC title

• F02M25/06

  adding lubricant vapours · CPC title

• F02B37/004 Primary

  with exhaust drives arranged in series · CPC title

• F01M13/021 Primary

  of negative pressure · CPC title