CN116997711A - EGR cooler - Google Patents

EGR cooler Download PDF

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Publication number
CN116997711A
CN116997711A CN202280020126.8A CN202280020126A CN116997711A CN 116997711 A CN116997711 A CN 116997711A CN 202280020126 A CN202280020126 A CN 202280020126A CN 116997711 A CN116997711 A CN 116997711A
Authority
CN
China
Prior art keywords
gas inlet
pipe
egr cooler
gas
tube
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.)
Pending
Application number
CN202280020126.8A
Other languages
Chinese (zh)
Inventor
岳下正挥
难波巧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Radiator Mfg Co Ltd
Original Assignee
Tokyo Radiator Mfg Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Radiator Mfg Co Ltd filed Critical Tokyo Radiator Mfg Co Ltd
Publication of CN116997711A publication Critical patent/CN116997711A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

An EGR cooler having: a flat tube (11) through which the exhaust gas flows, the tube having a substantially rectangular shape having a second direction longer than the first direction when viewed in cross section; a housing (12) that accommodates a plurality of tubes (11) in a state of being aligned in the first direction; and a single gas inlet portion (20) for introducing the exhaust gas into the pipe (11), wherein the gas inlet portion (20) is provided with two gas inlet ports (21 a, 21 b), a partition portion (22) for partitioning a space from each of the gas inlet ports (21 a, 21 b) to the pipe (11) into two spaces independent of each other is provided in the gas inlet portion (20), and when the gas inlet portion (20) side is viewed from the pipe (11) side in a cross section orthogonal to the extending direction of the pipe (11), an end portion of the partition portion (22) on the pipe (11) side extends between the two pipes (11) along the second direction.

Description

EGR cooler
Technical Field
The present application relates to an EGR cooler.
Background
An EGR cooler for cooling exhaust gas of an automobile or the like is known from patent document 1 or the like.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2014-152626
Disclosure of Invention
Technical problem to be solved by the application
The EGR cooler is provided with a gas inlet for EGR gas flowing from the internal combustion engine. The pressure of the EGR gas at the gas introduction port is not constant, and pulsation that periodically fluctuates due to the operation of the internal combustion engine is generated.
However, when there are a plurality of gas inlets, the pulsation cycles at the gas inlets may be shifted from each other due to variations in the ignition timing of the engine and variations in the length of piping from the internal combustion engine to the EGR cooler. At this time, since pulsation interference that averages the pressure differences of the respective gas introduction ports occurs, the maximum pressure obtained at the gas introduction ports may be reduced, and a desired flow of EGR gas may not be obtained in the EGR cooler. Therefore, it is desirable to develop an EGR cooler that suppresses pulsation interference and suppresses an increase in air resistance.
The purpose of the present application is to provide an EGR cooler that suppresses pulsation interference and suppresses an increase in air resistance.
Means for solving the problems
An EGR cooler according to an aspect of the present application includes:
a flat pipe in which exhaust gas flows, and which has a substantially rectangular shape in which a second direction is longer than a first direction when viewed in cross section;
a housing accommodating a plurality of the tubes in a state of being aligned in the first direction; and
a single gas inlet portion that introduces exhaust gas to the tube,
the gas inlet portion has two gas inlets,
the gas inlet portion is provided with a partition portion that divides a space from each of the gas inlets to the tube into two spaces that are independent of each other,
the end portion of the partition portion on the tube side extends between the two tubes along the second direction when the gas inlet portion side is viewed from the tube side in a cross section orthogonal to the extending direction of the tubes.
Effects of the application
According to the present application, an EGR cooler that suppresses pulsation interference and suppresses an increase in air resistance can be provided.
Drawings
Fig. 1 is a perspective view of an EGR cooler according to a first embodiment of the present application.
Fig. 2 is an exploded perspective view of the EGR cooler according to the first embodiment.
Fig. 3 is a cross-sectional view of the EGR cooler according to the first embodiment as viewed from above.
Fig. 4 is a view from the gas inlet section in section IV-IV in fig. 3.
Fig. 5 is a cross-sectional view of the gas inlet portion according to the first embodiment as viewed from above.
Fig. 6 is a cross-sectional view of the gas inlet portion according to the second embodiment as viewed from above.
Description of the reference numerals
1 EGR cooler
10. Heat exchange part
11. Pipe
12. Shell body
13. Dent is provided with
14. Front end plate
14a opening
15. Rear end plate
17. Fin type
20. 20A gas inlet portion
21a, 21b gas inlets
22. 22A partition
22a facing portion
22aA first opposite part
22aB second opposite part
22b engagement portion
30. Gas outlet
40. Water inlet part
50. Water outlet
Detailed Description
Hereinafter, embodiments of the present application will be described with reference to the drawings. For convenience of explanation, the dimensions of the components shown in the present drawing are sometimes different from the actual dimensions of the components.
In the description of the present embodiment, for convenience of description, the terms "left-right direction", "front-rear direction", and "up-down direction" are appropriately referred to. Here, the "up-down direction" is a direction including the "up direction" and the "down direction". The "front-rear direction" is a direction including the "front direction" and the "rear direction". The "left-right direction" is a direction including the "left direction" and the "right direction". Reference numeral U shown in the drawings described below represents an upper side. Reference numeral D denotes a downward direction. Reference symbol F denotes the front direction. Reference numeral B denotes a rear direction. Reference numeral L denotes a left direction. Reference symbol R denotes the right direction. In addition, when the EGR cooler is mounted to the vehicle, these directions are not limited to be coincident with the respective directions set for the vehicle.
(first embodiment)
Fig. 1 is a perspective view of an EGR cooler 1 according to a first embodiment of the present application. As shown in fig. 1, the EGR cooler 1 has: a heat exchange portion 10, a gas inlet portion 20 for introducing exhaust gas into the heat exchange portion 10, a gas outlet portion 30 for discharging exhaust gas from the heat exchange portion 10, a water inlet portion 40 for introducing cooling water into the heat exchange portion 10, and a water outlet portion 50 for discharging cooling water from the heat exchange portion 10 (see fig. 2).
In the example shown in fig. 1, the hot exhaust gas flows into the heat exchange portion 10 from the front through the gas inlet portion 20. Inside the heat exchange portion 10, heat exchange is performed between the exhaust gas and the cooling water. The cooled exhaust gas is discharged from the heat exchange portion 10 through the gas outlet portion 30 to the rear. The cold cooling water flows into the heat exchange portion 10 from below through the water inlet portion 40 at the rear of the heat exchange portion 10. The cooling water exchanges heat with the exhaust gas in the heat exchange portion 10. The heated cooling water is discharged downward through the water outlet portion 50 at the front of the heat exchange portion 10. The illustrated EGR cooler 1 is a so-called convection type EGR cooler in which the flow direction of cooling water in the heat exchange portion 10 is opposite to the flow direction of exhaust gas.
Fig. 2 is an exploded perspective view of the EGR cooler 1. Fig. 3 is a sectional view of the EGR cooler 1 as seen from above. As shown in fig. 2, the heat exchange unit 10 includes: a plurality of tubes 11 and a housing 12 accommodating the tubes 11.
The pipe 11 is a hollow member, and the exhaust gas flows inside thereof. The tube 11 is flat and substantially rectangular in cross section, and longer in the up-down direction (one example of the second direction) than in the left-right direction (one example of the first direction).
The housing 12 accommodates the plurality of tubes 11 in a state of being aligned in the left-right direction. The number of the tubes 11 accommodated in the case 12 may be any number, and in this embodiment, 11 tubes 11 are provided.
The cooling water flows in the space between the tubes 11 inside the case 12. Fins 17 are provided inside the tube 11 to facilitate heat exchange between the exhaust gas and the cooling water. The outer surface of the tube 11 is provided with dimples 13 for generating turbulence in the cooling water to promote heat exchange.
The case 12 is a square tubular member long in the front-rear direction. A front end plate 14 is mounted to an opening at the front end of the housing 12. A rear end plate 15 is mounted to an opening at the end behind the housing 12. The gas inlet 20 is mounted to the housing 12 via the front end plate 14. The gas outlet portion 30 is attached to the housing 12 via the rear end plate 15. The tubes 11 are mounted to these front and rear end plates 14, 15.
Fig. 4 is a cross-sectional view of section IV-IV of fig. 3. Fig. 5 is a cross-sectional view of the gas inlet portion 20 as seen from above. As shown in fig. 4 and 5, openings 14a are provided in the front end plate 14 at a plurality of positions corresponding to the tubes 11. The tube 11 is fitted into the opening 14a of the front end plate 14. The exhaust gas introduced into the gas inlet 20 flows through the pipe 11 fitted into the opening 14a.
Openings are provided in the rear end plate 15 at a plurality of positions corresponding to the tubes 11, respectively. The tube 11 is fitted into the opening of the rear end plate 15. The exhaust gas passing through the pipe 11 flows toward the gas outlet portion through the opening of the rear end plate 15. The openings 14a of the front end plate 14 and the openings of the rear end plate 15 are closed, and a liquid-tight space is formed by the housing 12, the tube 11, the front end plate 14, and the rear end plate 15. Cooling water flows in the liquid-tight space.
The gas inlet 20 has two gas inlets 21a, 21b and a partition 22. The gas introduction ports 21a and 21b are directly or indirectly connected to a pipe connected from the internal combustion engine to the EGR cooler 1, and introduce exhaust gas discharged by heating of the internal combustion engine into the gas introduction port 20. The partition 22 extends from between the two gas inlets 21a, 21b toward the pipe 11. That is, the partition 22 divides the space from the gas inlets 21a, 21b to the tube 11 into two spaces on the left and right sides. In the following description, a space located on the left side is sometimes referred to as a left gas passage, and a space located on the right side is sometimes referred to as a right gas passage. In addition, the partition 22 is provided to substantially divide the left gas passage and the right gas passage in half.
The end of the partition 22 on the tube 11 side has: the opposing portion 22a (corresponding to the first portion) extending in the flat direction (up-down direction in the present embodiment) of the tube 11; and a joint portion 22b (corresponding to a second portion) extending so as to intersect the vertical direction. The opposing portion 22a includes a first opposing portion 22aA and a second opposing portion 22aB. The first opposing portion 22aA is provided between adjacent tubes 11 when viewed from the front. The second opposing portions 22aB are also provided between adjacent tubes 11, and the second opposing portions 22aB are disposed with respect to the first opposing portions 22aA with one tube 11 interposed therebetween.
In the case where the tubes 11 are provided in an even number, the engagement portions 22b may not be provided. However, when the tube 11 is provided with an odd number, the joint 22b disposed so as to intersect the tube 11 is required to divide the space in the gas inlet 20 into approximately half of each of the left gas passage and the right gas passage.
Here, if the length of the first opposing portion 22aA is l 1a The length of the second opposing portion 22aB is l 1b The length of the joint portion 22b is l 2 The following equation is satisfied.
l 2 /(l 1a +l 1b )≤1/3
In the gas inlet 20 according to the present embodiment, a gap S is provided between the partition 22 and the pipe 11. In this case, the size of the gap S is preferably 2mm or less.
Next, the flow of the exhaust gas in the gas inlet portion 20 will be described with reference to fig. 4 and 5. The exhaust gas flows from the front toward the rear. Since the partition 22 is provided to partition the inside of the gas inlet 20 into the left gas passage and the right gas passage, the exhaust gas introduced from the gas inlets 21a, 21b reaches the pipe 11 without being mixed with each other. Since most of the exhaust gas reaching the pipe 11 flows into the pipe 11 closest to the position among the plurality of pipes 11, the exhaust gas introduced into the two gas introduction ports 21a, 21b hardly mixes even in the vicinity of the pipe 11, but flows into the pipe 11.
Here, the opposing portion 22a of the partition 22 extends in the vertical direction, which is the direction in which the tube 11 is flat. The opposing portions 22a are located between the adjacent tubes 11. In other words, the opposing portion 22a is disposed so as not to block the pipe 11, and thus the inflow of exhaust gas into the pipe 11 is not easily hindered by the opposing portion 22 a.
In the EGR cooler according to the present embodiment, the gas inlet portion 20 is provided with the partition portion 22, and the partition portion 22 divides the space from each of the gas introduction ports 21a, 21b to the pipe 11 into two spaces, i.e., the left gas passage and the right gas passage, so that the exhaust gas flowing in the left gas passage and the right gas passage does not mix with each other but flows into the pipe 11. Further, since the end portion of the partition 22 on the tube 11 side extends between the two tubes 11 along the vertical direction, which is the flat direction of the tubes 11, the inflow of the exhaust gas into the tubes 11 is not easily hindered by the partition 22. Thereby, the EGR cooler 1 is provided in which pulsation interference is suppressed and increase in ventilation resistance is suppressed.
In the EGR cooler 1 according to the present embodiment, the tubes 11 are provided in an odd number, and the end portion of the partition portion 22 on the tube 11 side has: an opposing portion 22a as a first portion extending between the two tubes 11 in the up-down direction; and an engagement portion 22b extending in a direction intersecting the up-down direction as a second portion, the engagement portion 22b having a length of 1/3 or less of the length of the opposing portion 22a, and therefore, the engagement portion 22b extending so as to block the pipe 11 and possibly obstructing the flow of exhaust gas into the pipe 11 is shorter than the opposing portion 22 a. Thus, even when the tubes 11 are provided with an odd number, the increase in ventilation resistance can be suppressed to a necessary minimum.
In the EGR cooler 1 according to the present embodiment, a gap S exists between the pipe 11 and the pipe 11 at the end of the partition 22 on the pipe 11 side when viewed from above the EGR cooler 1, which is a direction orthogonal to the direction in which the pipe 11 extends. Since the exhaust gas passing through the gas inlet 20 and the pipe 11 is at a high temperature, the gas inlet 20 and the pipe 11 may expand due to heat. At this time, since the gap S is provided between the partition 22 and the tube 11, interference caused by the gas inlet 20 and the tube 11 coming into contact with each other can be suppressed when the gas inlet 20 and the tube 11 expand.
In the EGR cooler 1 according to the present embodiment, the gap S provided between the gas inlet portion 20 and the pipe 11 is 2mm or less, and therefore the gap S is set to an amount taking into consideration expansion of the gas inlet portion 20 and the pipe 11. At this time, the exhaust gases introduced from the two gas introduction ports 21a, 21b can be further suppressed from being mixed with each other through the gap S, and therefore pulsation interference can be further reduced.
Next, an EGR cooler according to a second embodiment will be described. In addition, the same reference numerals are given to the components substantially identical to those already described in the description of the first embodiment, and the duplicate description is omitted.
Fig. 6 is a cross-sectional view of the gas inlet 20A according to the second embodiment as viewed from above. The gas inlet 20A according to the second embodiment is different from the gas inlet 20 according to the first embodiment in that the partition 22A is joined to the pipe 11, and the gap S existing in the gas inlet 20 according to the first embodiment is not present in the second embodiment.
In the present embodiment, the partition 22A is joined to the pipe 11 penetrating the front end plate 14, but the partition may be joined to the front end plate.
In the EGR cooler according to the present embodiment, the partition 22A is joined to the pipe 11, so that mixing of the exhaust gas flowing through the left gas passage and the right gas passage can be further suppressed near the pipe 11. This can further reduce the influence of pulsation interference.
The present application has been described above based on the embodiments. The present embodiment is an example of the present application, and is not limited to the above embodiment, and can be modified or improved as appropriate. The material, shape, size, numerical value, form, number, arrangement location, and the like of each component in the above embodiment are not limited as long as the present application can be implemented.
For example, in the present embodiment, the EGR cooler is described as an example in which the water inlet portion is located rearward of the water outlet portion, but the EGR cooler may be an EGR cooler in which the water inlet portion is located forward of the water outlet portion and in which the direction of flow of cooling water is the same as the direction of flow of exhaust gas.
The present application is appropriately incorporated by reference in Japanese patent application No. 2021-055579 filed on 3 months of 2021.

Claims (5)

1. An EGR cooler, comprising:
a flat pipe in which exhaust gas flows, and which has a substantially rectangular shape in which a second direction is longer than a first direction when viewed in cross section;
a housing accommodating a plurality of the tubes in a state of being aligned in the first direction; and
a single gas inlet portion that introduces exhaust gas to the tube,
the gas inlet portion has two gas inlets,
the gas inlet portion is provided with a partition portion that divides a space from each of the gas inlets to the tube into two spaces that are independent of each other,
the end portion of the partition portion on the tube side extends between the two tubes along the second direction when the gas inlet portion side is viewed from the tube side in a cross section orthogonal to the extending direction of the tubes.
2. The EGR cooler as claimed in claim 1, characterized in that,
the number of the tubes is an odd number,
the end portion of the partition portion on the tube side has, when the gas inlet portion side is viewed from the tube side in a cross section orthogonal to the extending direction of the tube: a first portion extending between two of the tubes along the second direction; and a second portion extending in a direction intersecting the second direction, and having a length of 1/3 or less of a length of the first portion.
3. An EGR cooler according to claim 1 or 2, characterized in that,
a gap exists between the pipe-side end of the partition portion and the pipe when viewed from a direction orthogonal to the direction in which the pipe extends.
4. An EGR cooler according to claim 3, characterized in that,
the gap is 2mm or less.
5. An EGR cooler according to claim 1 or 2, characterized in that,
the housing has:
a cylindrical portion having an opening; and
an end plate closing the opening,
the end plate separates a cooling space inside the housing through which cooling water flows from the gas inlet portion through which the exhaust gas flows,
the pipe penetrates the end plate to extend from the gas inlet portion to the cooling space,
the partition is engaged with the tube or the end plate.
CN202280020126.8A 2021-03-29 2022-03-18 EGR cooler Pending CN116997711A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2021-055579 2021-03-29
JP2021055579A JP2022152713A (en) 2021-03-29 2021-03-29 EGR cooler
PCT/JP2022/012701 WO2022210035A1 (en) 2021-03-29 2022-03-18 Egr cooler

Publications (1)

Publication Number Publication Date
CN116997711A true CN116997711A (en) 2023-11-03

Family

ID=83456032

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202280020126.8A Pending CN116997711A (en) 2021-03-29 2022-03-18 EGR cooler

Country Status (3)

Country Link
JP (1) JP2022152713A (en)
CN (1) CN116997711A (en)
WO (1) WO2022210035A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000018103A (en) * 1998-07-06 2000-01-18 Hino Motors Ltd Exhaust gas cooler
JP2010209878A (en) * 2009-03-12 2010-09-24 Tokyo Radiator Mfg Co Ltd Egr cooler
JP2012127267A (en) * 2010-12-15 2012-07-05 Ud Trucks Corp Egr device of multicylinder engine
JP2013088010A (en) * 2011-10-17 2013-05-13 Maruyasu Industries Co Ltd U-turn heat exchanger
JP6276054B2 (en) * 2013-06-21 2018-02-07 株式会社ティラド Heat exchanger
JP2016145524A (en) * 2015-02-06 2016-08-12 株式会社デンソー EGR cooler
KR101887750B1 (en) * 2016-07-22 2018-08-13 현대자동차주식회사 Egr cooler for vehicle
DE102018215746A1 (en) * 2018-09-17 2020-03-19 Mahle International Gmbh Exhaust cooling unit

Also Published As

Publication number Publication date
WO2022210035A1 (en) 2022-10-06
JP2022152713A (en) 2022-10-12

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