Egr device having diffusing device and egr mixer for egr device

Patent metadata

Field	Value
Publication number	US-2016160804-A1
Application number	US-201414561308-A
Country	US
Kind code	A1
Filing date	Dec 5, 2014
Priority date	Dec 5, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

A housing has an housing body. An inner pipe is accommodated in the housing body. The inner pipe defines an inner passage internally. The inner pipe defines an annular passage externally with the housing body. The inner pipe has through holes 68 communicating the inner passage with the annular passage. The housing internally defines an EGR channel communicating with the annular passage. The EGR channel accommodates a diffusing device 60 partitioning the EGR channel.

First claim

What is claimed is:

1 . An EGR device comprising:
a housing defining an inner passage internally and having an EGR inlet; and a diffusing device extended from the EGR inlet into the inner passage, wherein the diffusing device is a hollow member having at least one wall, a root end, and a tip end defining an interior, the at least one wall has a plurality of through holes communicating the interior with the inner passage, and the tip end is twisted relative to the root end.

2 . The EGR device according to claim 1 , wherein
the least one wall includes an upstream wall, lateral walls, and a downstream wall, and the lateral walls has at least one of the through holes.

3 . The EGR device according to claim 2 , wherein the downstream wall has at least one of the through holes.

4 . The EGR device according to claim 2 , wherein the upstream wall defines a closed surface without the at least one of the through holes.

5 . The EGR device according to claim 2 , wherein the upstream wall has a cross section in a convex shape.

6 . The EGR device according to claim 1 , wherein
the root end has a cross section having a root center, the tip end has a cross section having a tip center, and the root center is inclined at an angle relative to the tip center.

7 . The EGR device according to claim 6 , wherein the angle is between 5 degree and 45 degree.

8 . The EGR device according to claim 1 , wherein
the EGR inlet defines an EGR channel internally, the root end has an opening, and the opening communicates the EGR channel with the interior of the diffusing device.

9 . The EGR device according to claim 1 , wherein the throttle holes are arranged lengthwise in a plurality of rows.

10 . The EGR device according to claim 1 , wherein the throttle holes are alternately arranged lengthwise.

11 . The EGR device according to claim 1 , wherein
the housing has an inner periphery defining the inner passage, and the tip end is in contact with the inner periphery.

12 . The EGR device according to claim 1 , wherein the EGR inlet defines a funnel reduced in diameter into the opening.

13 . The EGR device according to claim 1 , wherein
the housing has an inner periphery defining the inner passage, and the tip end is distant from the inner periphery.

14 . The EGR device according to claim 13 , wherein the tip end is located around a center of the inner passage.

15 . The EGR device according to claim 1 , wherein the throttle holes are located on a downstream side in the lateral walls.

16 . The EGR device according to claim 14 , wherein the throttle holes are located around a center of the inner passage.

17 . An EGR mixer configured to be accommodated in a housing of an EGR device, the housing defining an inner passage internally and having an EGR inlet, the EGR mixer comprising:
a diffusing device body configured to be extended from the EGR inlet into the inner passage, wherein the diffusing device body is a hollow member having a wall, a root end, and a tip end defining an interior, the wall has a plurality of through holes configured to communicate the interior with the inner passage, and the tip end is twisted relative to the root end.

Assignees

• Denso Int America Inc
• Denso Corp

Inventors

• Dettloff Ian

Classifications

• F02M25/0722 Primary

  Mechanical Engineering · mapped topic

• B01F23/10

  Mixing gases with gases · CPC title

• B01F25/31331

  Perforated, multi-opening, with a plurality of holes · CPC title

• F02M26/19 Primary

  Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system · CPC title