WO2013139113A1 - 一种具有隔热功能的板翅式egr冷却器 - Google Patents

一种具有隔热功能的板翅式egr冷却器 Download PDF

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Publication number
WO2013139113A1
WO2013139113A1 PCT/CN2012/081278 CN2012081278W WO2013139113A1 WO 2013139113 A1 WO2013139113 A1 WO 2013139113A1 CN 2012081278 W CN2012081278 W CN 2012081278W WO 2013139113 A1 WO2013139113 A1 WO 2013139113A1
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WO
WIPO (PCT)
Prior art keywords
plate
heat
egr cooler
fin
bellows
Prior art date
Application number
PCT/CN2012/081278
Other languages
English (en)
French (fr)
Inventor
张文锋
官百俊
刘浩
胡义红
覃小军
赵优琪
杨联民
张守都
许凯俊
陆青松
陈陆瑛
Original Assignee
浙江银轮机械股份有限公司
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 浙江银轮机械股份有限公司 filed Critical 浙江银轮机械股份有限公司
Priority to US14/110,872 priority Critical patent/US9206767B2/en
Priority to EP12872297.2A priority patent/EP2829715B1/en
Publication of WO2013139113A1 publication Critical patent/WO2013139113A1/zh

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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
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • 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
    • F28D7/1684—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 the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/08—Tubular elements crimped or corrugated in longitudinal section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0236—Header boxes; End plates floating elements
    • F28F9/0239—Header boxes; End plates floating elements floating header boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0236—Header boxes; End plates floating elements
    • F28F9/0241—Header boxes; End plates floating elements floating end plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0248—Arrangements for sealing connectors to header boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/20—Arrangements of heat reflectors, e.g. separately-insertible reflecting walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to the technical field of engine exhaust gas cooling, in particular to a tube type EGR cooler for a diesel engine, in particular to a plate fin type EGR cooler with heat insulation function, which can be widely applied to various automobiles.
  • a tube type EGR cooler for a diesel engine in particular to a plate fin type EGR cooler with heat insulation function, which can be widely applied to various automobiles.
  • a plate fin type EGR cooler with heat insulation function which can be widely applied to various automobiles.
  • EGR exhaust gas recirculation cooler
  • the exhaust gas recirculation cooler includes an inlet gas pipe 1 ', an inlet chamber 2', a core assembly 5', an outlet chamber 6' and an outlet gas tube 7', which are sequentially connected.
  • the core assembly 5' includes a heat dissipation turbulence fin 11', a cooling flat tube 10', a connecting main board 9', an outer casing 4', an inlet water pipe 3' and an outlet water pipe 8', and a plurality of cooling flat tubes 10' Laminated in the outer casing 4', the two ends are inserted into the punching holes fixed on the corresponding connecting main board 9', and are electrically connected to the inlet chamber 2' and the outlet chamber 6', and each cooling flat tube 10 is
  • the heat dissipation turbulence fins 11' are disposed inside, and the pair of connecting main plates 9' are respectively fixed at the two ends of the outer casing 4', and the inlet water pipe 3 and the outlet water pipe 8 are disposed on the outer casing 4 on.
  • the exhaust gas recirculation cooler of the above structure has a gas side passage formed of a plurality of flat tube assembly units.
  • the single flat tube assembly unit is composed of a flat tube 10' and a heat exchange fin 1 interposed therebetween.
  • Each flat tube assembly unit is welded to the corresponding hole of the main board 9 at both ends to form a core assembly.
  • the main board 9 at both ends of the core assembly is welded to the outer casing 4' and the inlet chamber 2' and the outlet chamber 6'.
  • the outer casing 4' is welded with an inlet water pipe 3' and an outlet water pipe 8' to constitute an EGR cooler assembly.
  • the conventional plate-fin EGR cooler has the following disadvantages: 1. When the EGR cooler is operated, the high-temperature exhaust gas impacts the main plate of the EGR cooler, and the main plate itself expands to generate stress; 2. The EGR cooler is transported. In the row, the housing and the flat tube assembly unit have different degrees of thermal expansion and contraction, and an axial stress is formed. The stress generated by the above two points is likely to cause cracks in the welded joints at the ends of the main plate and the flat tube assembly unit at both ends. Summary of the invention
  • the present invention is to solve the above problems in the prior art, and aims to provide an EGR cooler which is more excellent in heat dissipation and reliability.
  • a plate-fin EGR cooler having a heat insulating function, comprising a casing, wherein the casing is provided with an intake flange and an outlet chamber at both ends, An inlet pipe and an outlet pipe are respectively disposed on the casing near the inlet flange and the outlet chamber, wherein the casing is provided with a heat dissipation core assembly, a gas chamber and a bellows, and the heat dissipation core assembly comprises a main board at both ends and an alternating flat tube assembly unit and a water side fin, each flat tube assembly unit including a flat tube and a heat exchange fin interposed therebetween, characterized in that the main board of one end of the heat dissipation core assembly
  • the housing is connected to the air outlet chamber, the other end of the main board is connected to one end of the air chamber, the other end of the air chamber is connected to one end of the bellows, and the other end of the bellows and the housing
  • the air outlet chamber the other end of the main board is connected to one
  • the plate-fin EGR cooler with heat insulation function of the invention comprises a gas side passage formed by an air inlet flange, an inner side of the heat insulation tube, a gas chamber, a flat tube inner side and an air outlet chamber, and is provided by the inlet pipe, the outlet pipe and the outer side of the bellows
  • the gas chamber side, the water side fin and the housing inner cavity constitute a water side passage.
  • the exhaust gas from the engine flows through the gas side passage, and exchanges heat with the cooling water passing through the water side passage in the heat dissipating core assembly, and the heat is absorbed by the cooling water and carried away to achieve the cooling effect.
  • one end of the heat-dissipating core assembly is directly connected to the casing, and the other end of the main plate is flexibly connected to the casing through the air chamber and the bellows. Since the other end of the main board is not directly connected to the housing, the axial deformation generated by the flat tube assembly unit can be transmitted through the air chamber to the bellows and absorbed by the bellows through the movement of the other end of the main board in the housing. The axial thermal stress caused by the thermal deformation of the flat tube assembly unit is eliminated.
  • the end of the other end of the main board is further provided with a heat insulation board, and the heat insulation board is provided with a through hole communicating with the flat tube. Due to the existence of the heat insulation board, the high temperature exhaust gas does not directly impact the main board, so the surface temperature of the main board is greatly reduced, that is, the stress generated by the main board due to its own thermal expansion is greatly reduced.
  • the heat insulation board adopts a material with high temperature resistance and corrosion resistance, one end is welded to the main board, and the other end is not fixed, so that the thermal deformation of the heat insulation board due to thermal expansion can be freely released.
  • the housing protrudes outward at a position corresponding to the other end of the main board to form two water flow passages, and a pair of baffles are disposed downstream of the two water flow passages.
  • one end of the heat insulating tube is fixedly connected to the bellows and the air inlet flange, and the other end is in contact with the bellows through a boss of the outer surface thereof.
  • the insulated pipe can effectively connect and position the bellows; on the other hand, since the inner end is only in contact with the bellows and is not fixed, the axial movement of the bellows is not limited, in the flat pipe
  • the bellows can freely move axially, transmitting, absorbing and eliminating axial stress on the main plate of the flat tube assembly unit.
  • the contact between the free end of the insulated pipe and the bellows can also be in the form of a convex ring or a bell mouth, and can also produce the same technical effect.
  • a plurality of sub-boards are respectively disposed on the inner side of the main board at the two ends of the heat dissipating core assembly, and a plurality of perforations for the flat tubes to pass through are formed on the board body of each of the sub-boards.
  • the periphery of each of the perforations is provided with a flange that is perpendicular to the plane of the plate body. Since the joint between the main plate and the flat pipe is at a right angle, stress concentration is likely to occur after welding, which causes cracking of the weld.
  • the joint between the flat tube and the perforation and the flange on the sub-board can increase the length of the weld of the flat tube, so that the stress of the weld is dispersed, thereby protecting the flat tube.
  • the inner side surface of the baffle has a corrugated structure, and the corrugated structure matches the flat tube shape of the heat dissipating core assembly, so that the water flow passage at the place is kept unobstructed.
  • the housing is further provided with a plurality of square bosses which increase the strength of the housing.
  • Figure 1 is a perspective view of a plate-fin EGR cooler having a heat insulating function according to the present invention.
  • FIG. 2 is a schematic view showing the structure of the intake end of the present invention.
  • Figure 3 is a schematic view showing the structure of the outlet end of the present invention.
  • Figure 4 is a cross-sectional view taken along line A-A of Figure 2;
  • Fig. 5 is a schematic structural view of a heat insulating tube.
  • Fig. 6 is a schematic structural view of a heat insulating plate.
  • Fig. 7 is a schematic structural view of a main board.
  • Fig. 8 is a schematic structural view of a sub-board.
  • Figure 9 is a schematic view showing the structure of the baffle.
  • Figure 10 is a schematic illustration of the flow of the gas side and water side media of the present invention.
  • Figure 11 is a schematic view showing the structure of a conventional EGR cooler assembly.
  • Figure 12 is a schematic view showing the structure of a conventional EGR cooler core.
  • Figure 13 is a schematic view showing the structure of a conventional EGR cooling flat pipe assembly.
  • a plate-fin type EGR cooler having a heat insulating function includes front and rear housings 3, 4, and the housings 3, 4 are provided with intake flanges 7 at both ends thereof.
  • Outlet chamber 1 The inlets 3, 4 are respectively provided with water inlets and drains near the inlet flange 7 and the outlet chamber 1, and the inlet and outlet ports are respectively connected to the inlet pipe 6 and the outlet pipe 2.
  • the heat dissipation core subassembly, the air chamber 11 and the bellows 12 are disposed in the housings 3, 4.
  • the heat sink core assembly includes main boards 15 and 27 at both ends, sub boards 14 and 28 on the inner side of the main board, and upper and lower sets of flat tube assembly units 8.
  • Each flat tube assembly unit 8 includes a flat tube and heat exchange fins interposed therein, and the upper and lower flat tube assembly units 8 are disposed in pairs, and a water side is disposed between the adjacent two pairs of flat tube assembly units 8 Fin 17.
  • the plate body 36 of each of the sub-boards 14, 28 is provided with a plurality of through holes 24 for the flat tubes to pass through, and the periphery of each of the perforations 24 is perpendicular to the plane of the plate 36. Flange 37. Referring to FIG.
  • the main board 15, 27 includes an intermediate plate body 30 and a peripheral outer frame 31.
  • the plate body 30 is provided with a through hole 23.
  • the flat tube assembly unit 8 passes through the flange 37 on the secondary main board And the through hole 24 is inserted into the through hole 23 of the main board, and is integrally welded to form a heat dissipation core assembly.
  • the outer frame 31 of the left end main plate 27 of the heat dissipation core assembly is welded to the housings 3, 4 and the air outlet chamber 1, and the outer frame 31 of the right end main plate 15 is welded to the outer wall 32 of the left end of the air chamber 11, the gas
  • the inner wall 33 at the right end of the chamber 11 is welded to the outer wall of the left end of the bellows 12, and the right end of the bellows 12 is welded to the casings 3, 4 and the intake flange.
  • the bellows 12 is provided with a heat insulating tube 13 connected to the inlet flange ⁇ .
  • the right end of the heat insulating tube 13 is welded to the right end of the bellows 12, and the left end is in contact with the inner wall of the bellows 12 through a boss 16 on the outer surface thereof.
  • the outer end of the plate body 30 of the left end main plate 15 is further provided with a heat insulating plate 10, and the heat insulating plate 10 is disposed in the outer frame 31 of the main plate, and the through hole 22 communicating with the flat tube is opened.
  • the left end of the heat insulation board 10 is welded to the board body 30 of the main board 15 and the outer wall 32 of the air chamber 11, and the other end is a free end, so that the heat deformation of the heat insulation board 10 due to thermal expansion can be freely released. Drop it.
  • the positions of the housings 3, 4 corresponding to the right end main plate 15 are outwardly convex, forming two water flow passages 34, 35, and a pair of baffles 9 are provided downstream of the two water flow passages.
  • the outer side surface 38 of the baffle 9 has a circular arc surface and is welded to the inner surfaces of the housings 3 and 4; the inner side surface 25 of the baffle 9 has a corrugated structure, and the corrugated structure and the heat dissipation core
  • the flat tubes of the sub-assemblies are matched in shape to keep the water flow path there unobstructed.
  • the baffle 9 can significantly improve the water side flow field, so that there is sufficient water flow to cool the welded joint between the main plate 15 and the flat tube assembly unit 8 and the main plate 15, which can further reduce the temperature of the intake side main plate 15 and reduce Thermal stress of the main board 15 and the flat tube assembly unit 8.
  • the plate-side EGR cooler of the present invention operates on the gas side as follows:
  • the exhaust gas discharged from the engine enters the inside of the heat insulating tube 13 from the intake flange 7, and flows through the gas chamber 11 and the heat insulating panel 10.
  • After the perforation 22 enters the inside of the flat tube of the heat sink core assembly.
  • heat is exchanged with the cooling water in the water fin 14 region, and the heat is absorbed by the cooling water and taken away to achieve the cooling effect; the exhaust gas after the cooling is discharged from the outlet chamber (as indicated by the solid arrow).
  • the working side of the water side of the present invention is as follows: Cooling water enters the inner cavity of the casings 3, 4 from the inlet pipe, flows through the outside of the bellows 12, outside the gas chamber 11, and the water flow passages 34 and 35 outside the main plate 15, in the flow blocking The plate 9 is blocked and returned, and then bypasses the baffle 9 to enter the water-side fin 17 region between the flat tubes of the heat-dissipating core assembly, and exchanges heat with the high-temperature exhaust gas inside the flat tube to absorb and carry away the heat.
  • the heated cooling water flows out of the outlet pipe (as indicated by the dotted arrow).

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

Abstract

提供一种具有隔热功能的板翅式EGR冷却器，壳体（3、4）两端设有进气法兰（7）和出气室（1），壳体(3、4）上靠近进气法兰（7）和出气室（1）处分别设有进水管（6）和出水管（2），壳体（3、4）内设有散热芯子组件、气室（11）和波纹管（12），散热芯子组件一端的主板（27）与壳体（3、4）和出气室（1）相连，另一端主板（15）与气室（11）的一端相连，气室（11）的另一端与波纹管（12）的一端相连，波纹管（12）的另一端与壳体（3、4）和进气法兰（7）相连；波纹管（12）内设有与进气法兰（7）联通的隔热管（13）。散热芯子组件的另一端主板（15）通过气室（11）和波纹管（12）柔性连接到壳体（3、4）上，扁管组件单元产生的轴向变形通过气室（11）传递到波纹管（12）处，并被波纹管（12）吸收，如此便消除了因扁管组件单元受热变形而产生的轴向热应力。

Description

一种具有隔热功能的板翅式 EGR冷却器
技术领域
本发明涉及发动机尾气冷却技术领域，尤其涉及一种柴油机用管带式的板式 EGR冷却器， 具体地说是一种具有隔热功能的板翅式 EGR冷却器， 它可以广泛 应用在各种汽车柴油发动机上。 背景技术
随着排放要求的日益严格， 废气再循环技术越来越多地应用在动力装置上， 各种结构 EGR冷却器相继产生。其中， 板翅式结构 EGR冷却器， 因其卓越的散 热性能， 得到更多的应用。
排放法规的日益严格，使 EGR率不断的增加， 即需要 EGR冷却器冷却的废 气流量不断增加，并且，很多 EGR设置在涡轮之前，即高压 EGR,这使进入 EGR 冷却器的废气温度达到 700°C— 800°C。 常规的板翅式结构 EGR冷却器，如中国专利 CN2009201173214公开的一种 废气再循环冷却器及其散热紊流翅片。参照图 11、 图 12和图 13， 该废气再循环 冷却器包括依次连接的进口气管 1 '、 进口腔室 2'、 芯子总成 5'、 出口腔室 6' 和出口气管 7'， 所述的芯子总成 5' 包括散热紊流翅片 11 '、 冷却扁管 10'、 连 接主板 9'、 外壳体 4'、 进口水管 3' 和出口水管 8'， 多个冷却扁管 10' 层叠排 列在外壳体 4' 内， 两端插入相应连接主板 9' 上开设的冲孔内固定， 并与所述 的进口腔室 2' 和出口腔室 6' 导通， 每个冷却扁管 10' 内均设有散热紊流翅片 11 '， 所述的一对连接主板 9' 分别固定在外壳体 4' 两端， 所述的进口水管 3和 出口水管 8设置在所述的外壳体 4上。
上述结构的废气再循环冷却器，其气侧通道由多个扁管组件单元构成。单个 扁管组件单元由扁管 10' 和其内部塞置的换热翅片 1 构成。 每个扁管组件单 元与两端主板 9， 对应的孔焊接， 构成芯子组件。 芯子组件的两端主板 9， 又与 外壳体 4' 以及进口腔室 2' 和出口腔室 6' 焊接。外壳体 4' 上焊接进口水管 3' 和出口水管 8'， 构成 EGR冷却器总成。 这样， 扁管组件单元内侧流通废气， 扁 管组件单元外侧与外壳体 4' 内腔流通冷却水， 吸收废气的热量并将其带走。
这种常规的板翅式 EGR冷却器存在以下缺点： 1、 EGR冷却器运行时， 高 温的废气冲击 EGR冷却器的主板， 主板自身膨胀产生应力； 2、 EGR冷却器运 行时， 壳体与扁管组件单元的热胀冷縮程度不同， 形成轴向应力。 以上两点产生 的应力极易造成两端主板与扁管组件单元端部的焊接缝处开裂。 发明内容
本发明要解决的是现有技术存在的上述问题，旨在提供一种散热效果和可靠 性更优良的 EGR冷却器。
为解决上述问题， 本发明采用以下技术方案： 一种具有隔热功能的板翅式 EGR冷却器， 包括壳体， 所述的壳体两端设有进气法兰和出气室， 所述的壳体 上靠近所述的进气法兰和出气室处分别设有进水管和出水管，所述的壳体内设有 散热芯子组件、气室和波纹管， 所述的散热芯子组件包括两端的主板以及交替设 置的扁管组件单元和水侧翅片，每个扁管组件单元包括扁管和其内部塞置的换热 翅片，其特征在于所述散热芯子组件一端的主板与所述的壳体和出气室相连， 另 一端主板与所述气室的一端相连， 所述气室的另一端与所述波纹管的一端相连， 所述波纹管的另一端与所述壳体和进气法兰相连；所述的波纹管内设有与所述的 进气法兰联通的隔热管。
本发明的具有隔热功能的板翅式 EGR冷却器， 由进气法兰、 隔热管内侧、 气室、 扁管内侧和出气室构成气侧通道， 由进水管、 出水管、 波纹管外侧、 气室 外侧、水侧翅片及壳体内腔构成水侧通道。发动机排出的废气流经气侧通道， 与 通过水侧通道的冷却水在散热芯子组件内进行热交换，其热量被冷却水吸收并带 走， 从而达到冷却效果。
本发明的具有隔热功能的板翅式 EGR冷却器， 散热芯子组件的一端主板与 壳体直接连接， 而另一端主板通过气室和波纹管柔性连接到壳体上。 由于另一端 主板不直接与壳体刚性连接，扁管组件单元产生的轴向变形可以通过另一端主板 在壳体内的移动， 使变形通过气室传递到波纹管处， 并被波纹管吸收， 如此便消 除了因扁管组件单元受热变形而产生的轴向热应力。
作为本发明的进一步改进， 所述的另一端主板的端部还设有隔热板， 所述 的隔热板开设有与所述扁管联通的穿孔。 由于隔热板的存在， 使高温废气不会直 接冲击到主板上， 因此主板的表面温度就会大大降低， 即大大的降低了主板因自 身热膨胀产生的应力。所述的隔热板采用耐高温、 耐腐蚀的材料， 一端与主板焊 接， 另一端不固定， 这样隔热板因热膨胀产生的热变形可以自由的释放掉。 作为本发明的再进一步改进， 所述壳体上对应于另一端主板的位置处向外 凸出， 形成两个水流通道， 所述两个水流通道的下游处设有一对挡流板。 这种结 构， 明显改善了水侧流场， 使此处有充分的水流来冷却主板和扁管组件单元与主 板之间的焊接缝，可以进一步降低进气侧主板的温度并降低主板及扁管组件单元 的热应力。
作为本发明的再进一步改进， 所述的隔热管的一端与所述的波纹管和进气 法兰固定连接， 另一端通过其外表面的凸台与所述的波纹管接触。 这种结构， 一 方面隔热管可有效地对波纹管进行连接和定位；另一方面由于其内端与波纹管仅 接触而不固定， 因而不会限止波纹管的轴向运动， 在扁管组件单元受热产生的轴 向变形时， 波纹管能够自由地进行轴向移动， 传递、 吸收并消除扁管组件单元的 主板上的轴向应力。所述的隔热管自由端与波纹管的接触也可以采用凸环或喇叭 口的形式， 也能够产生相同的技术效果。
作为本发明的再进一步的改进， 所述散热芯子组件两端的主板内侧还分别 设有一个副主板， 所述每个副主板的板体上开设有若干供所述的扁管穿越的穿 孔，所述每个穿孔的周边设有与所述板体平面垂直的凸缘。 由于主板与扁管连接 处呈直角， 因此焊接后容易形成应力集中， 从而造成焊缝开裂。 加入副主板后， 扁管与副主板上的穿孔和凸缘的连接部分可以增加扁管的焊缝长度，使焊缝的应 力分散， 从而起到保护扁管的作用。
作为本发明的再进一步的改进， 所述挡流板的内侧面呈波纹状结构， 该波 纹状结构与散热芯子组件的扁管外形相匹配， 使该处的水流通道保持畅通。
作为本发明的更进一步的改进， 所述的壳体上还设有若干方形凸台， 这些 方形凸台可增加壳体的强度。 附图说明
下面结合附图和实施例对本发明作进一步说明。
图 1是本发明的具有隔热功能的板翅式 EGR冷却器的立体示意图。
图 2是本发明的进气端结构示意图。
图 3是本发明的出气端结构示意图。
图 4是图 2的 A-A向剖面图。
图 5是隔热管的结构示意图。 图 6是隔热板的结构示意图。
图 7是主板的结构示意图。
图 8是副主板的结构示意图。
图 9是挡流板的结构示意图。
图 10是本发明气侧和水侧介质流动的示意图。
图 11是现有的 EGR冷却器总成结构示意图。
图 12是现有的 EGR冷却器芯子结构示意图。
图 13是现有的 EGR冷却扁管组件结构示意图。
图中： 1-出气室； 2-出水管； 3-壳体； 4-壳体； 5-排气管； 6-进水管； 7-进 气法兰； 8-扁管组件单元； 9-挡流板； 10-隔热板； 11-气室； 12-波纹管； 13-隔热 管； 14-副主板； 15-主板； 16-凸台； 17-水侧翅片； 18-方形凸台； 19-水流通道； 20-气流通道； 22-隔热板上的穿孔； 23-主板上的穿孔； 24-副主板上的穿孔； 25- 挡流板的内侧面； 26-壳体 3上的向外凸起部分； 27-主板； 28-副主板； 29-壳体 4 上的向外凸起部分； 30-主板板体； 31-主板外框； 32-气室外壁； 33-气室内壁； 34-水流通道； 35-水流通道； 36-副主板的板体； 37-副主板的凸缘； 38-挡流板的 外侧面。 具体实施方式
参照图 1至图 9， 本发明的一种具有隔热功能的板翅式 EGR冷却器， 包括 前后壳体 3、 4， 所述的壳体 3、 4两端设有进气法兰 7和出气室 1。 所述的壳体 3、 4上靠近所述的进气法兰 7和出气室 1处分别设有进水口和排水口， 所述的 进水口和排水口上分别连接进水管 6和出水管 2。 所述的壳体 3、 4内设有散热 芯子组件、 气室 11和波纹管 12。
所述的散热芯子组件包括两端的主板 15和 27，主板内侧的副主板 14和 28， 以及上下两组扁管组件单元 8。每个扁管组件单元 8包括扁管和其内部塞置的换 热翅片， 上下扁管组件单元 8两两成对设置， 相邻两对扁管组件单元 8之间各设 有一个水侧翅片 17。参照图 6， 所述每个副主板 14、 28的板体 36上开设有若干 供所述的扁管穿越的穿孔 24， 所述每个穿孔 24的周边设有与所述板体 36平面 垂直的凸缘 37。参照图 7， 所述的主板 15、 27包括中间的板体 30和周边的外框 31，所述板体 30上开设有穿孔 23。扁管组件单元 8穿过所述副主板上的凸缘 37 和穿孔 24后插接在所述主板的穿孔 23内， 并整体焊接形成散热芯子组件总成。 所述散热芯子组件左端主板 27的外框 31与所述的壳体 3、 4和出气室 1焊 接， 右端主板 15的外框 31与所述气室 11左端的外壁 32焊接， 所述气室 11右 端的内壁 33与所述波纹管 12左端的外壁焊接， 所述波纹管 12右端与所述壳体 3、 4和进气法兰 Ί焊接。 所述的波纹管 12内设有与所述的进气法兰 Ί联通的隔 热管 13。 所述的隔热管 13的右端与所述的波纹管 12的右端焊接， 左端通过其 外表面的凸台 16与所述的波纹管 12的内壁接触。
所述左端主板 15的板体 30外端部还设有隔热板 10， 所述的隔热板 10置于 主板外框 31 内， 其上开设有与所述扁管联通的穿孔 22。 所述隔热板 10的左端 与所述主板 15的板体 30以及气室 11的外壁 32—起焊接， 其另一端为自由端， 这样隔热板 10因热膨胀产生的热变形可以自由地释放掉。
所述壳体 3、 4上对应于右端主板 15的位置处 26、 29向外凸出， 形成两个 水流通道 34、 35， 所述两个水流通道的下游处设有一对挡流板 9。 所述挡流板 9 的外侧面 38呈圆弧面， 并与所述的壳体 3、 4的内表面焊接； 挡流板 9的内侧面 25 呈波纹状结构， 该波纹状结构与散热芯子组件的扁管外形相匹配， 使该处的 水流通道保持畅通。挡流板 9可明显改善水侧流场， 使此处有充分的水流来冷却 主板 15和扁管组件单元 8与主板 15之间的焊接缝，可以进一步降低进气侧主板 15的温度并降低主板 15及扁管组件单元 8的热应力。
参照图 10， 本发明的板翅式 EGR冷却器， 其气侧的工作途径如下： 发动机 排出的废气从进气法兰 7进入隔热管 13内侧， 流经气室 11和隔热板 10上的穿 孔 22后进入散热芯子组件的扁管内侧。在这里与水侧翅片 17区域的冷却水进行 热交换， 其热量被冷却水吸收并带走， 从而达到冷却效果； 降温后的废气从出气 室排出 （如实线箭头所示）。
本发明的水侧的工作途径如下： 冷却水从进水管进入壳体 3、 4的内腔， 流 经波纹管 12外侧、气室 11外侧、 主板 15外侧的水流通道 34和 35， 在挡流板 9 被阻挡后返回， 而后再绕过挡流板 9进入散热芯子组件的扁管间的水侧翅片 17 区域， 与扁管内侧的高温废气进行热交换， 将其热量吸收并带走； 加热后的冷却 水从出水管流出 （如虚线箭头所示）。
应该理解到的是：上述实施例只是对本发明的说明，而不是对本发明的限制， 任何不超出本发明实质精神范围内的发明创造， 均落入本发明的保护范围之内。

Claims

权 利 要 求 书 、 一种具有隔热功能的板翅式 EGR冷却器， 包括壳体（3、 4)， 所述的壳体（3、 4) 两端设有进气法兰 （7) 和出气室 （1 )， 所述的壳体 （3、 4) 上靠近所述 的进气法兰 （7)和出气室 （1 )处分别设有进水管 （6)和出水管 （2)， 所述 的壳体 （3、 4) 内设有散热芯子组件、 气室 （11 )和波纹管 （12)， 所述的散 热芯子组件包括两端的主板（15、 27) 以及交替设置的扁管组件单元（8)和 水侧翅片（17)， 每个扁管组件单元（8)包括扁管和其内部塞置的换热翅片， 其特征在于所述散热芯子组件一端的主板 （27) 与所述的壳体 （3、 4) 和出 气室 （1 )相连， 另一端主板 （15) 与所述气室 （11 ) 的一端相连， 所述气室
( 11 ) 的另一端与所述波纹管 （12) 的一端相连， 所述波纹管 （12) 的另一 端与所述壳体 （3、 4)和进气法兰（7)相连； 所述的波纹管 （12) 内设有与 所述的进气法兰 （7) 联通的隔热管 （13)。
、 如权利要求 1所述的一种具有隔热功能的板翅式 EGR冷却器，其特征在于所 述的另一端主板（15) 的端部还设有隔热板（10)， 所述的隔热板（10)上开 设有与所述扁管联通的穿孔 （22)。
、 如权利要求 2所述的一种具有隔热功能的板翅式 EGR冷却器，其特征在于所 述隔热板 （10) 的一端与所述的另一端主板 （15) 相连， 所述隔热板 （10) 的另一端为自由端。
、 如权利要求 1所述的一种具有隔热功能的板翅式 EGR冷却器，其特征在于所 述壳体 （3、 4) 上对应于另一端主板 （15) 的位置处 （26、 29) 向外凸出， 形成两个水流通道（ 34、 35 )，所述两个水流通道的下游处设有一对挡流板（ 9 )。 、 如权利要求 1所述的一种具有隔热功能的板翅式 EGR冷却器，其特征在于所 述的隔热管 （13) 的一端与所述的波纹管 （12) 和进气法兰 （7) 固定连接， 另一端通过其外表面的凸台 （16) 与所述的波纹管 （12) 接触。
、 如权利要求 1所述的一种具有隔热功能的板翅式 EGR冷却器，其特征在于所 述散热芯子组件两端的主板（15、 27)内侧还分别设有一个副主板（14、 28)， 所述每个副主板 （14、 28) 的板体 （36) 上开设有若干供所述的扁管穿越的 穿孔 （24)， 所述每个穿孔（24) 的周边设有与所述板体（36)平面垂直的凸 缘 （37)。
、 如权利要求 1所述的一种具有隔热功能的板翅式 EGR冷却器，其特征在于所 述挡流板 （9) 的内侧面 （25) 呈波纹状结构。
、 如权利要求 1-7任何一项所述的一种具有隔热功能的板翅式 EGR冷却器，其 特征在于所述的壳体 （3、 4) 上还设有若干方形凸台 （18)。
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US20140034028A1 (en) 2014-02-06
CN102619648B (zh) 2014-06-04
EP2829715B1 (en) 2018-11-07

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