Classifications

• • 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
  • F28D7/1607—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 with particular pattern of flow of the heat exchange media, e.g. change of flow direction
• • 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
  • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
• • 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
  • 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
• • 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
  • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
  • F28F9/0263—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by varying the geometry or cross-section of header box
• • 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
  • 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
  • F28F2009/0285—Other particular headers or end plates
  • F28F2009/029—Other particular headers or end plates with increasing or decreasing cross-section, e.g. having conical shape

Definitions

• the present invention relates to an EGR cooler that is attached to an EGR device that recirculates engine exhaust gas to reduce the generation of nitrogen oxides and cools exhaust gas for recirculation.
• an EGR device that reduces the generation of nitrogen oxides by recirculating a part of exhaust gas from an engine of an automobile or the like to the engine.
• the engine is re-used.
• the temperature of the exhaust gas decreases and its volumetric force S decreases, thereby lowering the combustion temperature without significantly lowering the output of the engine and effectively reducing the generation of nitrogen oxides.
• Some engines are equipped with an EGR cooler that cools the exhaust gas in the middle of the line that recirculates the exhaust gas to the engine.
• FIG. 1 is a cross-sectional view showing an example of the EGR cooler.
• reference numeral 1 denotes a cylindrical shell, and both ends of the shell 1 in the axial direction are closed with end faces of the shell 1.
• the plates 2 are fixed to each other, and a number of tubes 3 are fixed to each plate 2 so that both ends of the tubes 3 penetrate therethrough. These tubes 3 extend inside the shell 1 in the axial direction. ing.
• a cooling water inlet pipe 4 is attached near one end of the shell 1 and a cooling water outlet pipe 5 is attached near the other end of the shell 1, so that the cooling water 9 is cooled.
• Water is supplied from the water inlet pipe 4 to the inside of the shell 1, flows outside the tube 3, and is discharged from the cooling water outlet pipe 5 to the outside of the shell 1.
• a bonnet 6 formed in a bowl shape is fixed to the opposite side of the shell 1 of each plate 2 so as to cover the end surface of each plate 2, and the center of one bonnet 6 is an exhaust gas.
• Exhaust gas outlet 8 is provided at the center of the other bonnet 6, and the exhaust gas 10 of the engine enters the inside of one bonnet 6 from the exhaust gas inlet 7 and a large number of tubes. After being cooled by heat exchange with cooling water 9 flowing outside the tube 3 while passing through the tube 3, it is discharged into the other bonnet 6 and recirculated to the engine from the exhaust gas outlet 8 I'm going to do it.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2002-327654
• Patent Document 2 Japanese Patent Application Laid-Open No. 2000-45884
• the conventional bypass outlet pipe 5a also serves as an air vent for discharging air mixed in the shell 1, so that the cooling water inlet pipe 4 is located below the bypass outlet pipe.
• the two units must be arranged vertically facing each other so that 5a is at the top, and there is a problem that the mounting position of the EGR cooler on the vehicle is restricted.
• the present invention has been made in view of the above circumstances, and has as its object to prevent the formation of cooling water stagnation without restricting the mounting posture of an EGR cooler on a vehicle.
• the present invention includes a tube and a shell surrounding the tube, and supplies cooling water to the inside of the shell and exchanges heat between the exhaust gas and the cooling water by passing exhaust gas into the tube.
• An EGR cooler wherein an annular cooling water supply chamber is fitted around an end of the shell in the axial direction, and a cooling water inlet pipe is connected around the cooling water supply chamber; At a plurality of locations in the circumferential direction of the portion of the shell that is covered by the cooling water supply chamber, as the distance from the connecting location of the cooling water inlet pipe increases in the circumferential direction.
• a communication hole is formed so as to gradually reduce the diameter, and cooling water is introduced into the shell from the communication holes substantially uniformly.
• the cooling water introduced from the cooling water inlet pipe into the cooling water supply chamber extends over the entire circumference in the cooling water supply chamber, and is substantially uniformly distributed from each communication hole. Since it is dispersed and introduced into the shell, cooling water stagnation is not formed near one axial end of the shell.
• the EGR cooler can be rotated around the shell axis to freely change the orientation of the cooling water inlet pipe. Yes.
• a non-opening portion in which a communication hole is not drilled is provided at a position opposite to a cooling water inlet pipe in a portion of the shell covered by the cooling water supply chamber in a circumferential required range.
• the EGR cooler of the present invention since cooling water can be dispersed and introduced into the shell from each communication hole substantially uniformly to prevent the formation of stagnation, heat exchange between the exhaust gas and the cooling water can be prevented. Efficiency is greatly improved, and thermal deformation due to local high-temperature deformation of the tube can be reliably prevented.
• the posture of the EGR cooler is rotated around the axis of the shell to face the cooling water inlet pipe. Can be changed freely, so that there is an excellent effect that the restriction on the mounting posture of the EGR cooler in the vehicle can be greatly eased as compared with the conventional case.
• FIG. 1 is a cross-sectional view showing an example of a conventional EGR cooler.
• FIG. 2 is a sectional view showing one embodiment of the present invention.
• FIG. 3 is a sectional view taken along the line III-III in FIG. 2.
• FIG. 4 is a cross-sectional view showing a mounting posture of the EGR cooler different from FIG.
• FIG. 5 is a cross-sectional view showing another mounting posture of the EGR cooler different from FIG. Explanation of reference numerals
• FIGS. 2 to 5 show one embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.
• an annular cooling water supply chamber 11 is externally mounted near one end of the shell 1 in the axial direction (near the left end in FIG. 2).
• a cooling water inlet pipe 4 is connected to the periphery (the lowermost part in the figure) of the cooling water supply chamber 11, and a plurality of portions of the shell 1 surrounded by the cooling water supply chamber 11 in the circumferential direction are provided with
• the communication holes 12 are drilled so that the diameter gradually decreases as the distance from the connection point of the cooling water inlet pipe 4 in the circumferential direction decreases, and the cooling water 9 is introduced into the shell 1 from the communication holes 12 substantially uniformly. It is structured so that
• a non-opening portion 13 in which a communication hole 12 is not formed is set in a required range in the circumferential direction. It has been secured throughout.
• annular cooling water discharge chamber 14 is externally mounted near the other axial end of the shell 1 (near the right end in FIG. 2), and the cooling water
• the cooling water outlet pipe 5 is connected to the periphery (the uppermost part in the figure) of the discharge chamber 14 and the cooling
• the communication holes 15 are also provided at a plurality of locations in the circumferential direction of the portion covered by the water discharge chamber 14, but only the cooling water outlet pipe 5 may be provided as in the related art.
• the cooling water 9 introduced into the cooling water supply chamber 11 from the cooling water inlet pipe 4 is satisfactorily divided into two hands by first hitting the non-opening portion 13, Since the cooling water is efficiently distributed over the entire circumference in the cooling water supply chamber 11 and is dispersed and introduced into the shell 1 from each of the communication holes 12 almost uniformly, the cooling water is provided near one axial end of the shell 1. No stagnation is formed.
• the cooling water inlet pipe 4 is disposed at the highest position among the plurality of communication holes 12 continuous in the circumferential direction of the shell 1. As it plays the role of an air vent for discharging air from inside the shell 1, the posture of the EGR cooler is rotated around the axis of the shell 1 as shown in Figs. 4 and 5, for example. Then, the direction of the cooling water inlet pipe 4 can be freely changed.
• the cooling water 9 can be dispersed and introduced into the shell 1 almost uniformly from each of the communication holes 12 to prevent the formation of stagnation.
• the heat exchange efficiency with the EGR cooler can be greatly improved, and the thermal deformation of the tube 3 due to the local high temperature can be reliably prevented. Since the direction of the cooling water inlet pipe 4 can be freely changed, restrictions on the mounting posture of the EGR cooler on the vehicle can be remarkably relaxed as compared with the conventional case.

Landscapes

• 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)
• Exhaust-Gas Circulating Devices (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Details Of Heat-Exchange And Heat-Transfer (AREA)
• Exhaust Silencers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34074604

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (21)

Citations (3)

• 2003
  • 2003-07-18 JP JP2003276680A patent/JP2005036765A/ja active Pending
• 2004
  • 2004-07-12 CN CNA2004800207459A patent/CN1826461A/zh active Pending
  • 2004-07-12 US US10/564,160 patent/US20060201661A1/en not_active Abandoned
  • 2004-07-12 WO PCT/JP2004/009940 patent/WO2005008055A1/ja active Application Filing
  • 2004-07-12 EP EP04747406A patent/EP1647697A1/de not_active Withdrawn
  • 2004-07-12 KR KR1020067000850A patent/KR20060063885A/ko not_active Application Discontinuation

Patent Citations (3)

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