CN110741153B - Exhaust gas recirculation device - Google Patents
Exhaust gas recirculation device Download PDFInfo
- Publication number
- CN110741153B CN110741153B CN201880039239.6A CN201880039239A CN110741153B CN 110741153 B CN110741153 B CN 110741153B CN 201880039239 A CN201880039239 A CN 201880039239A CN 110741153 B CN110741153 B CN 110741153B
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- China
- Prior art keywords
- exhaust gas
- gas recirculation
- egr
- condensed water
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/74—Protection from damage, e.g. shielding means
Abstract
The invention provides an exhaust gas recirculation device which can prevent condensed water mixed with soot generated when an EGR cooler cools from polluting vehicle-mounted components such as an engine and pipelines with a simple structure. The exhaust gas recirculation device has: an EGR cooler provided in the EGR passage; an EGR valve (12) that adjusts the flow rate of exhaust gas cooled by the EGR cooler; and a water passage hole (12f) for discharging the condensed water generated in the EGR passage to the outside. The exhaust gas recirculation device further comprises a bracket (20), wherein the bracket (20) is arranged below the water through hole (12f) and collects condensed water discharged from the water through hole (12 f).
Description
Technical Field
The present invention relates to an Exhaust Gas Recirculation apparatus having an EGR (Exhaust Gas Recirculation) cooler and an EGR valve.
Background
In order to reduce NOx in exhaust gas of an engine, an exhaust gas recirculation device (hereinafter also referred to as "EGR device") that recirculates exhaust gas to the engine is widely used. The EGR device is described in, for example, patent document 1.
The EGR apparatus recirculates a part of exhaust gas of the engine to an intake side of the engine through an EGR passage (i.e., an EGR pipe). An EGR cooler and an EGR valve are provided in the EGR passage. The exhaust gas cooled by the EGR cooler is regulated in flow rate by the EGR valve and flows back to the intake port of the engine.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. H07-243354
Disclosure of Invention
Problems to be solved by the invention
However, if the exhaust gas is cooled by the EGR cooler, condensed water mixed with the soot is generated. Since there is a possibility that the condensed water reaches a motor or the like for driving the EGR valve, the motor is adversely affected, and therefore, conventionally, measures such as providing a water passage hole for discharging the condensed water to the outside have been taken.
However, if the engine, the pipe, and the like are disposed below the EGR valve and the condensed water containing the soot discharged from the water passage hole blackens the contamination of the engine, the pipe, and the like, the appearance may be deteriorated, and the marketability may be deteriorated.
The invention aims to provide an exhaust gas recirculation device which can prevent dirt caused by condensed water mixed with soot by a simple structure.
Means for solving the problems
An aspect of the present invention provides an exhaust gas recirculation device for recirculating a part of exhaust gas of an engine to an intake side of the engine through an EGR passage, the exhaust gas recirculation device including:
an EGR cooler provided in the EGR passage;
an EGR valve provided in the EGR passage and configured to adjust a flow rate of the exhaust gas cooled by the EGR cooler;
a water passage hole provided in the EGR valve, for discharging condensed water generated in the EGR passage to the outside; and
and a condensed water collecting unit disposed below the water passage hole and collecting the condensed water discharged from the water passage hole.
Effects of the invention
According to the present invention, condensed water dropping from the water passage holes is collected by the condensed water collecting portion, so that it is possible to prevent the condensed water mixed with the soot from contaminating the engine, the piping, and the like with a simple structure.
Drawings
Fig. 1 is a schematic diagram showing the overall configuration of the embodiment.
Fig. 2 is a simplified cross-sectional view showing the structure of the EGR valve.
Fig. 3 is a side view for explaining the condensed water trap of the embodiment.
Fig. 4 is a side view showing the flow of the condensed water at the condensed water trap portion.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings.
In the present embodiment, an in-line four-cylinder diesel engine is described as an example, but the present invention is not limited to the diesel engine, and may be applied to a gasoline engine, and the number of cylinders and the arrangement of cylinders are not limited thereto. In addition, with respect to the drawings, the dimensions are changed to facilitate understanding of the structure, and the ratios of the plate thickness, the width, the length, and the like of each member and each member do not necessarily match the ratios actually manufactured.
Fig. 1 is a schematic diagram showing the overall configuration of the embodiment. As shown In fig. 1, an engine (internal combustion engine) 1 includes an engine main body 2, an exhaust passage Ex, an intake passage In, and an EGR (exhaust gas recirculation) passage Eg, and includes: an exhaust manifold 3, an intake manifold 4, a turbocharger 5 composed of a variable turbine 5a and a compressor 5b, an air Filter 6, an intercooler 7, an intake throttle valve 8, an intake duct 8a, an aftertreatment device 9 composed of a DOC (Diesel Oxidation Catalyst) 9a and a DPF (Diesel Particulate Filter) 9b, and an EGR device 10.
The EGR device 10 includes an EGR cooler 11, an EGR valve (may also be referred to as an EGR valve unit) 12, and a reed valve (may also be referred to as a check valve) 13. The EGR cooler 11 and the EGR valve 12 are connected by an EGR conduit 14.
The engine 1 includes a so-called high-pressure EGR system that recirculates EGR gas from the exhaust gas upstream side of the turbocharger 5, and therefore the differential pressure at the inlet and outlet of the EGR valve 12 is small and becomes negative pressure depending on the operating state. Therefore, by providing the reed valve 13 in the EGR passage Eg, the EGR gas can be extracted by utilizing the periodic pressure difference variation caused by the pulsation of the intake and exhaust strokes of the cylinder while preventing the backflow of the EGR gas.
Fig. 2 is a simplified cross-sectional view showing the structure of the EGR valve 12. The EGR valve 12 has: a housing 12a, a valve main body 12b formed of a butterfly valve, a drive shaft 12c that drives the valve main body 12b, a gear 12d, and a motor 12 e. The driving force of the motor 12e is transmitted to the valve main body 12b via the gear 12d and the drive shaft 12c, and the valve main body 12b is driven, as a result of which the flow rate of the exhaust gas recirculated from the EGR passage Eg to the engine 1 is adjusted.
The motor 12e, the gear 12d, the drive shaft 12c, and the like are housed in the housing 12 a. Here, although the drive shaft 12c and the pipe (EGR passage Eg) are sealed with a sealant or the like, condensed water generated when the EGR cooler 11 cools may leak from a gap or the like of the sealant. The leaked condensed water is accumulated on the bottom surface of the case 12 a. In order to avoid the adverse effect of the condensed water accumulated in the case 12a on the motor 12e, a water passage hole 12f is formed in the lower surface of the case 12a, and the condensed water is discharged from the water passage hole 12f to the outside of the case 12 a.
In the present embodiment, as shown in fig. 3, a holder 20 serving as a condensate water trap is provided below the water passage hole 12 f. The bracket 20 is a member having a substantially L-shaped cross section, and is fixed to a lower portion of the EGR valve 12 by a bolt 30. The bolt 30 is a bolt for fixing the EGR valve 12 to the EGR passage Eg, and in the present embodiment, the bolt 30 is also used as the fixing bracket 20. This eliminates the need to increase the number of components for fixing the bracket 20.
The bracket 20 is mounted in a manner having an inclination with respect to the horizontal. Specifically, one end 20a of both ends 20a and 20b of the holder 20 is disposed at a position where the condensed water falling from the water passage hole 12f can be received, and the other end 20b is disposed at a position lower than the one end 20 a. Further, the lower end 20b of the holder 20 is closed by a plate-like closing member 20 e.
The bracket 20 is formed by bending a single metal plate into an L shape, and as a result, has a side plate 20c, a bottom plate 20d, and a ridge portion between the side plate 20c and the bottom plate 20 d. The bracket 20 is attached so that one end of the bottom plate 20d faces slightly upward, so that the condensate does not leak from the end of the bottom plate 20d and flows along the ridge. Thus, the condensed water dropped to the one end 20a of the holder 20 flows along the ridge portion of the holder 20 and accumulates on the other end 20b side of the holder 20.
In addition, the stent 20 is painted black.
In the above configuration, part of the condensed water mixed with soot generated when the EGR cooler 11 cools drops from the water passage hole 12f, but the condensed water mixed with soot is trapped by the holder 20 and does not adhere to the engine, the piping, or other members disposed below the EGR valve 12. This can prevent the components such as the engine and the pipes disposed below the EGR valve 12 from being contaminated with condensed water containing soot.
Here, as shown by arrow F in fig. 4, the condensed water mixed with soot dropped to the side of one end 20a of holder 20 flows from the inclined upper end 20a of holder 20 to the lower end 20b along the ridge portion of holder 20, and is accumulated at the lower end 20b of holder 20. The condensed water mixed with the soot evaporates moisture therein with the passage of time, and only the soot remains on the rack 20. The stent 20 is painted in black, so that the fouling of the stent 20 by the soot is not noticeable.
As described above, according to the present embodiment, the bracket 20 is provided below the EGR valve 12, and condensed water mixed with soot dripping from the water passage hole 12f of the EGR valve 12 is collected by the bracket 20, so that the condensed water mixed with soot can be prevented from contaminating the engine, the piping, and the like with a simple structure.
The above-described embodiments are merely examples of embodying the present invention, and the technical scope of the present invention should not be limited by these embodiments. That is, the present invention can be implemented in various forms without departing from the gist or the main feature thereof.
In the above-described embodiment, the case where the holder 20 is provided as the condensed water collection portion that collects the condensed water discharged from the water passage hole 12f has been described, but the present invention is not limited to this, and for example, sponge or cloth may be used as the condensed water collection portion. That is, a sponge or cloth may be disposed below the water passage hole 12 f. However, since there is a possibility that the position where the condensed water trap portion is disposed becomes high temperature, it is more preferable to use the holder 20 as in the embodiment.
In the above-described embodiment, the holder 20 having an L-shaped cross section is used, but the shape of the holder is not limited thereto, and in any case, the holder may have any shape as long as it can collect and temporarily store the condensed water.
The present application is based on the japanese patent application (japanese patent application 2017-122357) filed on 22.6.2017, the contents of which are hereby incorporated by reference in their entirety.
Industrial applicability
The exhaust gas recirculation device of the present invention can be widely applied to an exhaust gas recirculation device for a vehicle.
Description of the reference numerals
1 Engine
2 Engine body
10 EGR (exhaust gas Recirculation) device
11 EGR cooler
12 EGR valve
12a casing
12b valve body
12c drive shaft
12d Gear
12e motor
12f water through hole
20 support
20c side plate
20d bottom plate
20e closure member
Eg EGR (exhaust gas Recirculation) passage
Ex exhaust passage
An In intake passage.
Claims (4)
1. An exhaust gas recirculation device that recirculates a part of exhaust gas of an engine to an intake side of the engine through an exhaust gas recirculation passage, the exhaust gas recirculation device comprising:
an exhaust gas recirculation cooler provided in the exhaust gas recirculation passage;
an egr valve provided in the egr passage and configured to regulate a flow rate of the exhaust gas cooled by the egr cooler;
a water passage hole provided in the exhaust gas recirculation valve, the water passage hole discharging condensed water generated in the exhaust gas recirculation passage to the outside; and
and a condensed water collecting unit disposed below the water passage hole, and collecting the condensed water discharged from the water passage hole in a state where the condensed water is exposed to outside air.
2. The exhaust gas recirculation apparatus according to claim 1,
the condensed water trapping part is a bracket arranged below the water through hole,
the section of the bracket is L-shaped, and the ridge part faces downwards.
3. The exhaust gas recirculation apparatus according to claim 2,
the bracket is installed to have an inclination with respect to the horizontal, and one end of a lower side of the bracket is closed to accumulate the condensed water.
4. The exhaust gas recirculation apparatus according to claim 2,
the stent is painted black.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017122357A JP7095234B2 (en) | 2017-06-22 | 2017-06-22 | Exhaust gas recirculation device |
| JP2017-122357 | 2017-06-22 | ||
| PCT/JP2018/022914 WO2018235736A1 (en) | 2017-06-22 | 2018-06-15 | Exhaust gas recirculating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110741153A CN110741153A (en) | 2020-01-31 |
| CN110741153B true CN110741153B (en) | 2021-08-31 |
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ID=64735640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880039239.6A Active CN110741153B (en) | 2017-06-22 | 2018-06-15 | Exhaust gas recirculation device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7095234B2 (en) |
| CN (1) | CN110741153B (en) |
| WO (1) | WO2018235736A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11608800B2 (en) | 2020-12-11 | 2023-03-21 | Caterpillar Inc. | Engine coolant collector |
| US11149624B1 (en) | 2020-12-11 | 2021-10-19 | Caterpillar Inc. | Mounting structure for engine coolant collector |
| US11454157B2 (en) | 2020-12-11 | 2022-09-27 | Caterpillar Inc. | Engine system with coolant collector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6301887B1 (en) * | 2000-05-26 | 2001-10-16 | Engelhard Corporation | Low pressure EGR system for diesel engines |
| CN102052203A (en) * | 2009-11-04 | 2011-05-11 | 福特环球技术公司 | Method and arrangement for exhaust-gas recirculation in an internal combustion engine |
| JP2012117455A (en) * | 2010-12-01 | 2012-06-21 | Hino Motors Ltd | Condensed water storage discharge mechanism of heat exchanger |
| JP2013011227A (en) * | 2011-06-29 | 2013-01-17 | Daihatsu Motor Co Ltd | Exhaust gas recirculation device |
| CN105986939A (en) * | 2015-03-17 | 2016-10-05 | 通用电气公司 | Apparatus and method for passive charge air condensate drain with exhaust stack vent |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080028757A1 (en) | 2004-10-25 | 2008-02-07 | Behr Gmbh & Co. Kg | Condenser in a Turbo-Compressor System and Method for Operating One Such System |
| JP2014211135A (en) * | 2013-04-19 | 2014-11-13 | いすゞ自動車株式会社 | Exhaust gas recirculation device |
| JP6263928B2 (en) | 2013-09-30 | 2018-01-24 | 三菱自動車工業株式会社 | Condensate separator |
| JP2015086833A (en) | 2013-11-01 | 2015-05-07 | いすゞ自動車株式会社 | Exhaust recirculation device |
| JP5976022B2 (en) | 2014-01-09 | 2016-08-23 | 日本フルハーフ株式会社 | Drain device in a box-type carrier such as a freezer car |
| JP6306980B2 (en) | 2014-08-22 | 2018-04-04 | 日野自動車株式会社 | EGR system |
| JP2016215146A (en) * | 2015-05-21 | 2016-12-22 | 臼井国際産業株式会社 | Gas-liquid separator |
| JP6466257B2 (en) * | 2015-06-05 | 2019-02-06 | 臼井国際産業株式会社 | Gas-liquid separator |
-
2017
- 2017-06-22 JP JP2017122357A patent/JP7095234B2/en active Active
-
2018
- 2018-06-15 WO PCT/JP2018/022914 patent/WO2018235736A1/en active Application Filing
- 2018-06-15 CN CN201880039239.6A patent/CN110741153B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6301887B1 (en) * | 2000-05-26 | 2001-10-16 | Engelhard Corporation | Low pressure EGR system for diesel engines |
| CN102052203A (en) * | 2009-11-04 | 2011-05-11 | 福特环球技术公司 | Method and arrangement for exhaust-gas recirculation in an internal combustion engine |
| JP2012117455A (en) * | 2010-12-01 | 2012-06-21 | Hino Motors Ltd | Condensed water storage discharge mechanism of heat exchanger |
| JP2013011227A (en) * | 2011-06-29 | 2013-01-17 | Daihatsu Motor Co Ltd | Exhaust gas recirculation device |
| CN105986939A (en) * | 2015-03-17 | 2016-10-05 | 通用电气公司 | Apparatus and method for passive charge air condensate drain with exhaust stack vent |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7095234B2 (en) | 2022-07-05 |
| JP2019007388A (en) | 2019-01-17 |
| CN110741153A (en) | 2020-01-31 |
| WO2018235736A1 (en) | 2018-12-27 |
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