GB2559866A

GB2559866A - Heat exchanger

Info

Publication number: GB2559866A
Application number: GB1721429.7A
Authority: GB
Inventors: Maruyama Katsumi; Yuri Nobuyuki; Shimizu Motohiro; Etsunagi Kenichi
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2016-12-26
Filing date: 2017-12-20
Publication date: 2018-08-22
Anticipated expiration: 2037-12-20
Also published as: GB2559866B; JP2018105216A; CN108240775A; JP6622688B2; GB201721429D0

Abstract

A heat exchanger 1 comprises a bottomed case portion 2 which holds a fluid B, and an exhaust gas flow channel 10 inside the case portion. Heat is conducted from exhaust gas A1, A2 flowing through the exhaust gas flow channel to the fluid. The exhaust gas flow channel 10 has a first exhaust gas flow channel 11 which passes through the inside of the case portion 2 and a second exhaust gas flow channel 12 which winds spirally around the first exhaust gas flow channel 11 in a space where the fluid in the case portion 2 is held. The first and second exhaust gas flow channels 11, 12 are connected in series. The second exhaust gas flow channel 12 may be a single flow channel. The first exhaust gas flow channel 11 may have a chamber 11a which accommodates a catalyst 6 for treating the exhaust gas A1 and a bottomed inner tube 11b which surrounds the catalyst accommodating chamber 11a to define a flow channel 11c for the exhaust gas A2 around the catalyst accommodating chamber 11a. The heat exchanger 1 is particularly suitable for use with exhaust gas from an internal combustion engine.

Description

(54) Title of the Invention: Heat exchanger

Abstract Title: Heat exchanger for exhaust gas with helical gas flow channel (57) A heat exchanger 1 comprises a bottomed case portion 2 which holds a fluid B, and an exhaust gas flow channel 10 inside the case portion. Heat is conducted from exhaust gas A1, A2 flowing through the exhaust gas flow channel to the fluid. The exhaust gas flow channel 10 has a first exhaust gas flow channel 11 which passes through the inside of the case portion 2 and a second exhaust gas flow channel 12 which winds spirally around the first exhaust gas flow channel 11 in a space where the fluid in the case portion 2 is held. The first and second exhaust gas flow channels 11, 12 are connected in series. The second exhaust gas flow channel 12 may be a single flow channel. The first exhaust gas flow channel 11 may have a chamber 11a which accommodates a catalyst 6 for treating the exhaust gas A1 and a bottomed inner tube 11b which surrounds the catalyst accommodating chamber 11 a to define a flow channel 11 c for the exhaust gas A2 around the catalyst accommodating chamber 11a. The heat exchanger 1 is particularly suitable for use with exhaust gas from an internal combustion engine.

FIG.2

CD

CL

FIG.l

2/6

FIG.2

A3*

3/6

8g

FIG.3

4/6

A2 < 2d 11 bd A2 2b CL

FIG.4

-CL o

Ξ3

CN ro cn

CN

FIG. 5

6/6

1B

IE AT EXCHANGER .

Πκ' present invention relates to a heat exchanger utilizing heat of exhaust gas from an internal combustion engine.

JP-A-2009-293448 explains a cogeneration system including a heat exchanger which exchanges Iks- between a coolani of an internal combustion engine connected to a geneutior and o hauu gas disch-uged ib-m the internal combustion engine to increase the suupamsnse of the coolant. in the neat exehanger described in ,;P-\~20du. 29344$. a heat conductive pipe through which exhaust gas is passed is connected vepieafly inside a fluid channel for the coolant so that the coolant flows dnough: the heat conductive pipe spirally io effect a heat exchange. jp-Λ· 2060--2 3 7415 also explains a heai exchanger winch exchanges heat between exhaust gas dtsdtargcd hem an internal combustion engine and a coola?h. and the heat exchanger has a configuration in which a piunibis of heat conductive pines are connected vertically inside a fluid channel for the coolant.

With the configuration of the I seat exchanger described in JP-A-200°-29244«S or the heat exchanger dC'Cribed it; .Φ~α-2Τ00~2574 15 in which the phuaiity of heat conductive pipes are provided so as to pass through the fluid channel ku the coolant vertically.;·; sufficient length of on exhaust gas flow channel necessary to efieef a heal exchange is ensured. On the other hand, since many connecting portions exist where the heat conduelive pipes are connected, there is caused a problem that die configuration ano the production process become complex.

An dued -ΌηΙ least the preferred embodiments ofthe invention is to provide a heat exchanger which has a sufficient length of an exhaust gas flow channel necessary

IlCvt <i heat exchange and a sin-pie configuration.

[0006

According to the invention, there is provided a heat exchanger {for example, heat exchangers 1, 1Λ, 1 B in an embodiment) including:

a bottomed case portion (for example, a ease portion 2 in an embodiment) winch hold-'·,: fluid (for example, a fluid B in an embodiment); and an exhaust gas flow channel tfbr example, an exhaust gas flow channel SO in an embodiment; v Inch Is pnwided io-dde of the ease portion.

wherein heat is conducted from exhaust gas Bowing through: the exhaust gas flow channel Io the fluid, the exhaust gas flow channel has:

a firs; exhaust gas flow channel (for example, a lost exhaust gas flow channel 11 in an embodiment) which passes thu-ugh the inside of the case porti--m. and a ,-cc-.>nd pa flow' channel (for example, a second exh-mst pas flow channel 12 n ,tr e:o.)0'f:i eafi n/ach wine.? ,-ptm 1/ am -nd tire flrst exhaust gas flow channel in a space where the fluid inside the case portion is held.

wherein the first ex In channel and the second exhaust gas flow are connected in scries

The second exhaust gas How channel may be made up oi a single flow channel.

[0008 u

The fir;·-! exhaust gas now eiiajmei may have a catalyst accommodating chamber (fm example, a catalyst accommodating chamber Ila in an embodiment5 which accommodates a catal·.sf (for example, a oataivst 6 in an embodiment) which treats condiments of fIk exhaust gas. and a bottomed inner lobe (for example, inner tubes lib, lid. lie in an embodiment) which surrounds the catalyst accommodating chamber to define a flow channel lor the exhaust gas around the catalyst accommodating chamber,

A bottom surface (for example, a bodo-n surface ilbci in an embodhnent) of the inner tube tnay he supported on a single point by a projecting portion (for example, a projecting portion 2d in an embodiment) which is formed on a bottom portion (for example, a o- atom porik-u 2b in an embodiment) of the ease portion.

An miler eiren inferential surface of the inner tube mav base an uneven portion y -: * (for example, a projecting portion 11 be In an embodiment) which snatches an uneven vonfigmatien of the second exhaust uas flow channel which luces -foe inner tube,

The heat exchanger may comprise:

a lid portion (for example, a lid portion 8 in an embodiment) which is psovided ms a side of the ease portion which lies opposite to the bottom portion of the case portion. and which defines a space (for example, a space I? in an embodiment) establishing, a comnmnteafiou iron· the first exhaust gas -low channel to the second exhaust gas flow channel, wherein a groove (for example, a grooves 8g in an embodiment) directed toward an inlet port (for example, an inlet port 121 in an embodiment) of inc second exhaust ;.-ai fiow channel -s formed on an inner surface t for exanmle, an inner surface · a ·

S-: sn ass cmbiidimein) <>f the Hd portion, [0012]

The first e.xhaust g0^;; charjuel and fire second exhaasi gas flow channel may be eonuecied directly io each other.

[0013]

According io (he invention, the exhaust gas flow channel provided inside of the ease portion Iras the luM cxbau-'t ga·' flow channel which passes through the case portion, and she second exhaust gas flow channel which winds spirally an-und the first exhaust gas fiow cluumel In rfic space where dm fluid in.-ido the ease poituur is h>,ld The first exhaust gas flow channel and the second exhaust gas flow channel arc connected in scries, in this v,ay since the second exhaust gas flow' channel is formed spirally, the sufficient length of exhaust gas flow channel necessary to effect r= hc:d exchange ear; be ensured. Additionally since the first exhaust gas flow channel and the second uxhaust gas flow channel are connected fit scries, d is possible to provide he hen; οχ banner havinu the sum-ic eonii.e.uraiiou.

In embodiments in which the second exhaust gas flow channel is made up of a single flow channel the numbe- of pup, necessary p, make up the second e.sb.aust gas flow channel can be ,edueed Additionally since the >c-.ond οχήηη,ΰ gas flow channel has to be connected to other portions of the heat exchanger al only two locations of the ink; port and an outlet port, the manufacturing process of the heat exchanger can bo simplified.

[001aj hi embodiment·' in which the firs? exhaust gas fiow channel ha> a catalyst accommodating chamber winch accomm-”-datss a catalyst for treating -<.u-slitueuts of the exhaust gas. and in which a flow channel for the exhaust gas ts defined around she eataiyst accommodating chamber by a bottomed inuer tube, a space inside the second exhaust gas flow channel which, is formed spirally can be made use of without any loss. As a rest ill, the heat exchanger can be made small in size.

in embodiments in which a bottom surface of the inner tube Is supported on a single point by a protecting portion which is formed on die bottom portion of the ease portion, the amount of heat dissipated from the first exhaust gas flow channel to orc fide of the neat exchanger by way of the inner robe and tire bottom portion of the ease portion can be reduced. As a reauh, the heat recovering eifide.ney of the heat exchanger can be improved.

in embodiments in which an uneven 'portion is burned on an outer circumlerenfiai surface of the timer tube tin? urea where the fimd contacts the outer eircurnieresuial surface of the inner tube can be increased, therebv makine it possible to increase the amount of heat to he exchanged. Additionally. where the uneven portion is imide to inan.il the uneven configuration oi'rhe second exhaust gas tlow channel winch faces the inner tube, and where tire second exhaust gas flew channel is disposed in a recessed portion on the outer circumferential surface of the inner tubs, the heat exchange- can he made small in size.

In embodiment? in which n groove directed toward the inlet port of the second exhaust gas flow channel I? bn med on an Inner smihee of a lid portion, the exhaust pus is limviug along the inner .surface of the hd portion con he guidon effectively to the inlci port of the second e.xhansl gas Dow channel et on though the only single inky port Is provided, d-erd-y making il possible to improve -he How of ihe exhaust g<w.

In embodiments in which., the first, exhaust gas flow channel and the second exhaust gas lunv channel tut.· connected directly in each other. tliere exists no tabes portion than the thud to which heat is conducted along the path defined In she heat exchanger horn the point whe-e exhaust, gas is introduced to the point where the exhaust gas is discharged from the heat exchanger. As a result, the heat recovering eifieic nc y of Ihe heat exchanges can be improved.

ig, 1 is an exploded perspective view of a heat exchanger of a first embodiment according to the invention.

Fig, 2 is a vertical sectional view of the heat exchanger of the first embodiment taken along a line X~X shown in Fig, 1, showing an assembled state of the heal exchanger.

f-ig. 3 is a perspective view of a t a second exhaust gas flow' channel cm an i

Fig. 4 is a vertical sectional \ sew taken along the line X-X shvwn in Fig. exchanger.

xuhon which lies opposite to an inlet port of rarer surface of a lid portion, i,-f a heat exchanger of a second embodiment L -dmwing car assembled slate of the heat

Fig. 5 is air exploded perspective view of a heat exchanger of a third embodiment according to the invention.

Fig. 6 is a verucal sectional view of the heat exchanger of tne ihnd embodiment laktn along a line Y-Y slv.-wn in pig. 5, showing «η assembled state oi'tbe liCUt 0X0 h,-llgCr ! ( |: W i ( llerehiaiter, emh—brocots of die invention will be described by reference to the drawings and by way of example only, [0022] (First Embodiment)

A heat exchanger of a first embodiment according to the invention will be described by reference to figs. 1 and .:. 1 ig. 1 is an exploded pessneciiw icw oi (be heat exchanger of the first embodiment. Fig. 2 is a vertical sectional view old he beat exchanger of the first embodiment taken along a lino X-X shown in Fig. 1. showing an assembled stare of the heat exchanger.

[0023] /Vs shown in Figs. 1 and 2. the heat exchanger 1 includes a bottomed cylindrical case portion 2 which holds a fluid B for a heat exchange, and an exhaust gas flow channel 10 which is provided inside of the case portion 2, In the heat exchanger 1. the beat exchange is executed by conducting heat iron- exhaust gas discharged from an internal combustion engine and Hewing through the exhaust gas flow channel 10 to the fluid bold in the case portion 2 The fluid is a coolant of the

Internal combustion engine or the like.

The h /AV Zh t’5 . f y ·. .-j ci-k* has a cylindrical shape as a whole. One end face and an outer circumferential surface of the heat exchanger 1 defined around a center line

CL as an axis thereof are made up of the case portion 2, while a bd normm S having an exhaust gas muodiuflon pipe 3- substotitittlly at a ccnte- thereof is provided nt the other end face of the heat exchange! 1, Exhaust gas Λ J discharged from the interna; combustion engine or the like is introduced into the exhaust gas introduction prpe 3 of the lid portion 8, arid exhaust gas A3 whose heat has already been exchanged is discharged font an exhaust gas dtseh'uge pipe 4 which is provided at a bottom portion 2b of the ea*e portion 2. Additionally. the fluid B is introduced from an inlei port 2i which: N provided on a lower side tat a portion lying close to the bohorn portion of thi/ heal exchange: and is discharged iro-r: an outlet port 2u which is provided on an upper side fat a portion lying close to the lid portion 8;· of the heat exchanger 1.

The exhaust gas Slow channel If has Am; exhaust gas How channel 11 which is provided in the case portion 2 to extend along the center line Cl· of the heat exchanger 1, and a single second exhaust gas flow channel 12 which winds spirally around the first exhaust gas flow channel 11 in a space where the fluid B inside the case portion 2 is held. I he flr.-a exhaust gas How channel 11 and tire second exhaust gas flow channel 12 arc connected in senes. Namely, the first exhaust gas flow channel 11 is disposed along the center axis CI inside the second exhaust gas flow channel 1.2. which ) ’ iormed in a cod-like ennflgutahon in which a single pipe winds around the center hire CL sptrally and substantially concentrically. Exhaust gas introduced Iron: the exhaust gas uun-huedon pipe 3 flows at first through the first exhaust uas flow channel IL

The frrst exhaust gas flow channel 11 includes a catalyst accommodating chamber tin which is disposed along tin? center line CL. and a bottomed cylindrical inner tube 1 ih which: surrounds the catalyst .ueummodatlnc chamber I la to defluc an exhaust gas How channel around the catalyst accommodating chamber 11a. The inner tube lib is disposed anart from the bottom portion 2b -d flu.

portion 2, and a bottom surface i Ibd of the inner tube 11b is supported on a single point at a projecting portion 2d which is formed substantially at a center of the bottom portion 2b of the ease portion 2.

The exhaust gas introduced from the exhaust gas introduction pipe 3 into the first exhaust gas flow channel H is sent at fust into the Calais st accommodating chamber 1 it;. A catalyst 6 to; treating constituents of the exhaust gas Al introduced from the exhaust gas introduction pipe 3 is accommodated in the catalyst accommodating chamber I la. The catalyst accommodating chamber I la is opened at a lower surtace thereof so dial exhaust gas A2 resulting from treating the exhaust gas

Al supplied horn above using the catalyst o is discharged downward, the treated exhaust gas Λ2 discharged from the catalyst accommodating chamber Ila passes inrough a eormetung flow channel lie which is defined between the eandyst accommodating chamber 1 la and the inner lube 1 lb. and is discharged into a space 13 which connects the first exhaust gas How channel 11 to the second exhaust gas flow channel 12. The space P- faces an inner surface of Jr· |jfl portion 8. A single inlet non Pi for the second exhaust gas fl--w channel 12 ;s provided m an upper wall portion 2c which connects an outcu wall portion 2a of the cast portion 2 and the inner tube lib together.

[0028] fig, 3 is a perspective view of a portion winch lies opposite to the inlet port 121 ol the second exhaust gas flow, channel 12 in the inner surtacc of the iid portion 8. As shown in big. 3, a plurality of grooves 8g are formed on the inner surface 8s of the kd portion S, 1 he groove.? Sg arc directed toward a circular recess ; xuiion Sp which:

PC’S the inlet pmi 1 21 el the ^ecottd exhaust gns Slo-vc channel 1.?.. Ί he grooves 8g are formeu so that the grt-oves 8g get deeper as they are apart away from the recess portion Sp.

h.hic open eno oi trie seeoti.il cxlion-d g&u*: now ehantier ¢^. is cotutecicu ».o lute inlet port 12i of the second exhaust gas How channel 12 which is provided in die tipper wail portion 2c of die ease portion 2, The exhaust gas discharge pipe 4 is ec-nnceted to the other open end oi the second exhaust gas flow channel 12 which winds in a coil-like toshion in a space where the thhd B is held arid which: is deiined by the outer wail portion 2a„ the bottom portion .:h and dw epicr wall portion 2c of the case portion .: and the inner tube 11 h.

I iercuiidto;·, the operation to nre heat exchanger I of this embodiment wdl he described.

[0031] be exhaust gas Λ1 which: is introduced Γηιηι the exhaust, gas introduction ptpc 3 a; the upper portion of the heal exchanger I flows into the th si exhaust gas How channel 11. The constituents of the exhaust gas Al are treated in die catalyst accoiinnodating chamber I la, and the treated exhaust gas is discharged from a lower surface of the catalyst accommodating chamber Ila, The treated exhaust gas ;\?: discharged from the catalyst accommodating chamber Ila passes through: the connecting Itov channel lie which is defined between the catalyst ace-nim-’dating chamber 1 la arid tire tuner tube lib. Heal of the exhaust gas A2 which is passing through the connecting How channel ilc is conducted io the fluid B by way of the tuner its be lib.

[0032]

The exhaust gas A2 which hm· passed through tl-e connecting flow channel

I lc is discharged into the space 13 which connects the first exhaust gas flow channel

II and the second exhaust gas A-w channel 12 together, ihereafte; the exhaust gas Λ.?. is guided into the inlet port 121 of the second exltaust gas flow channel 12 by the plurality of grooves Sg now-ded on the inner surface Ss of the Hd portion S. Ihc exhaust gas which flows into the second exhaust gas flow channel 12 from the inlet p-rt 121 parses through the second exhaust gas flow channel 12 which is spiral, and is then discharged front the exhaust gas pipe 4 at a lower portion of the heat excl as exhaust gas A3, exhaust gas flow eh;

I leal of the exhaust gas which is ’passing through the second siiel 12 is conducted io the fluid B which surrounds the second exhaust gas flow; channel 12.

I bus. ns has been described heretofore. according to the this embodiment, the exhaust gas flow channel J) pj woed rnii he ccc-e portion 2 includes the first, exhaust go,- flow channel I I w nt h js ί ' i.ed .t te center line Cl. of the ease pordon 2, and the second exhaust gj ·, flow channel 12. which winds spirally around the fust exhaust gas channel 11 in dtc space where the lluid & inside the ease portion 2 is held. The fust exhaust gas flow channel 11 and rite second exhaust gas flow channel 12 ate connected in scries. In thi?· way. -ince the <eta;ud exhaust ga-' flow channel 12 is ioruted in the coil-tike configuration, the- sufficient length of the exhaust gas flow chnnnel 10 necessary to effect a heat exchange can be ensured. Since the first exhaust gas flow channel ii and the second exhaust gas Hew channel 12 are connected in series, it is possible to provide the heat exchange; having the simple configuration. [0034]

Α00:ί1οί:<ιΠy. -dnce die se-„ond cxbatwl gas flow channel 12 is made up of the single How channel, the number of parts for the second exhaust gas flow channel 12 can he reduced. In addition, since the second exhaust gas ttow channel 12. has to- he connected to other portions ofthe heat exchanger 1 al the only two locations of the inlet port and the outlet port, the manufacturing process of the heat exchanger j car; be simplified [0035] ; he hrs; exhaust gu> How channel 1 1 has the catalyst accommodating chamber ita which accommodates the catalyst 6 for treating the constituents ofthe exhaust gas, and the exhaust gas how channel is defined around the catalyst accommodating chamber Ila by the bottomed inner tube lib. Therefore, the spacc iaside the second exhaust gas How channel 12 which ;s formed spirally can be made use of without any loss. As a result, the heat exchanger t can be made small in size.

In addition, since the bottom surface 11 bd oftiic inner lube I ib is supported on i he single point at the projecting portion 2d which fo formed on the bottom portion 2b of the case portion 7. the amount of heal winch ;s dissipated from the first exhaust gas How channel 11 to the outside rh the heat exchanger 1 by way of the inner tube 1 lb and the bottom portion 2b ofthe case portion 2 can be reduced, recovering efficiency of the beat exchanger 1 can be improved, [0037]

As a result, the heal

Since the inner surface 8s of foe hd portion 8 has the grooves Eg which are directed the Inlet pert 121 of the second exhaust gas flow channel 12. the exhaust gas 'lowing along the inner surface 8s ot the lid pea-don 8 etna Sac guided effectively to the inlet port 12i ofthe second exhaust gas flow channel 12 even though the only single inkt port 12i is provided, thereby making it possible to improve the lb »w of the exhaust gas.

[0038j ; Second I Imbodimenu fig. 4 1·; a vertical sectional view of a heat exchanger of a second entbodirnent taken along, the line X-N shown in Fig, 1, showing an assembled state of the heat exchanger. A beat exchanger 1A of the second emh”dbnent outers trom the heat exchanger 1 of the tirst embodiment in the eonlieurahon of an inner tube 1 Id. The remaining features ofthe heat exchanger 1A of the second embodiment are similar to those of the heat exchanger 1 of the lt-st embodiment, and hence. In I-Ig. 4, like relejencc numerals are given io like eonsitiutnt elements to those of the first embodiment,

As shown in Fig. 4, surface ·.. the hater a projecting portion llbe is formed on an outer circumferential tube lid ol this embodiment, the p-ojeeihtg portion 1 1 be is configured to extend spirally along the outer elrcttmfeenfial surface of the inner tube

I Id. A spacing W defined along a center line Cl by the spiral projecting portion

II be is made to match an uneven configuration on a side of a second exhaust gas flow channel 12 which faces the inner tube lid. Namely, the second exhaust gas flow channel 12 is set to fit in a recess portion which is defined spirally along the spiral projecting portion l lbe on tire other eircumterential surface of the inner tube 1 Id.

In this way, aceordingt to the second embodiment. since die projecting pm:km 1 Ibc is formed on the outer circumferential surface of the inner tube 1 hi, the area where the fluid B contacts the outer circumferential surface of the inner tube I Id can be increased, thereby making it possible to increase the amount of heat to be exchanged. Additionally. since the projecting portion Si be is made io match the uneven eo-digum-ion of the second exhaust gas slow' channel 12 which laces the inner tube 11d. and the second exhaust gas flow channel 12 is disposed in the recess portion on the outer circumferential surface of the inner tube 1 id. the heat exchanger I A. can be made small in size in relation to a radial direction.

(Third b.mbodimcm)

In the first and second embodiments, the space 13 which mees the- lid portion 8 exists between the first exhaust gas flow channel 11 and the second exhaust gas flow channel 12. Since the exhaust gas A2 discharged from the firs; crimm·: gas flow channel II into the space 13 strikes the inner surface 8s of the lid portion 8 and lie wukn lows .nfo the second exhaust gas How channel 12, the temperature of the lid po non X Ifeh m«h. ip an upper surface of the heat exchanger 1 Is increased by the heat from the exhaust gas A2. dissipated from the lid portion 8 o cfslcieney of the heat exchanger 1

Namely,, pari of the heat of the exhaust gas is the heat exchanger 1 to reduce the hen; recovering

In the third embodiment, a connection between

1he fnst exh.tU't mamh muddied gas flow channel 11 and the second exhaust gas How channel 12 is with a dew to in-proving da,· I teat recovering efficiency of the heat exchanger.

[0042] of a third id perspective view of a heat ex;, hanger embodiment. fig, 6 is a icriiutl sectional view os the heat exchanger ol the fiord embodiment biken akmg a hue Y-Y shown at 1 diowinc an assembled Mate ol die heat exchanger. The heat, exchanger 1B ofthe third embodiment differs irotn the heat exchanger I of fine first embodiment in a connection between a first exhaest gas flow channel li and a second exhaust gas flow channel 12. and configurations of mt inner lube I Ie and a ltd pojskm IS. The n.-mainirsg features cd the heat exchanger I B ofthe 1 bird end--.tun·. m are sirmiar to those of the heat ex chan get I ofthe first embodiinenf, and hence, in figs. .5 nod 6. like reference nuinwafi a?e given to like constituent elements to those shown in figs. 1 and 2. A projecting portion 11 be similar to that of the second embodiment may be Ibrnted on an outet eircumferential surface ofthe inner ε I I e of this embodiment.

[0043]

As shown in fig. o, in this embodiment, the ‘mace 13 defined between the fir a exhaust gas flow channel II and the second exbail·’· ;<t^; flow channel I.?, in the first embodiment is not provided, and a first exhaust gas flow channel 11 and a second exhaust gas flow channel 12 are connected directly to each oiher. To realize list* emmeeied configuration, an outlet port llo is prodded in an otster circumferential surim c ol the Inner tube lie of this embodiment, and; one open cut! ofthe second exhaust gas thaw channel 12 is connected to- the outlet port I Io. (.'onsecuenfly, the exhaust gas Λ2 which has passed through a eonnerting flow channel I ic of the lust exhaust gas flow channel I I flows directly into the second exhaust gas flow- channel

12.

Although the grooves arc formed on the inner surface <F; of the lid portion 8 in the orsi embodiment. no grooves are formed on an inner surface -d die hd porttoi 18 >.u rins mnl--dunem. Ί he lid portion 18 11 nid-tightfi seals up the space vitero the Hold B is stored with the eo;moeriug flow channel 1 le who-tibc lid po-fiou 18 is fitted in the ease portion 2.

[0045]

In -his way. in this embodiment, since the first exhaust nas flow channel 11 and the second exhaust gas flow channel 12 are connected directly to each other, there exists no other portion than the fluid B a- which heat is conducted along the path defined in the heat exchanger 1 B from the point where exhaust gas is introduced to the point where, the exhaust gas ts discharged from the heat exchanger IB. As a result the heat recovering efficiency of the heat exchanger IB can be improved, fhc invent heretofore and hen·,.

litst m third etttboe coil dike configuration wit channel 11 around the first on is not Hmttvd to the embodiments that have been described e can he modified or improved ;ts required Fm example., in the irnems the second exhaust gas flow- channel 12 is formed in tite n a case where fite ease portion ieh surrounds eonecntrieaily fhc thst exhaust gas flow exhaust gas flow channel 11 as the center line. However.

is not cylindrical. the configuration ol the second exhaust gas Fv channel 12 is not limited to tlte eoll-Hke configured·'··: and ience.

other spiral configurations may he adopted which correspond to configurations of the ease portion 2. in addition, as to the spiral configuration of the second exhaust gas low' channel 12. the second exhaust gas stow- channel 12 winds spirally in the smgle toil-Hke configuration around the firsf exhat. a go - Ifow channel 1 1 in the first to third embodiments, However, tlte second exhaust gas flow channel 12 may wind spirally ar an-J {be first ολΑοοΗ gas Ifou channel in a double or triple concentric eoil-like eon.bgurau.e-n [0047J

A; to the pipe enallguntion Uribe -.'-haust gas flow channel 10, the invention is not limited to the eircuia; configuration shown in the figmes, and hence, the exhaust uus how channel 10 mav be modified into other uneven configurations as r.-quired,

Trie eenfiguradon of the grooves Kg formed on she mne: surface Ka ·η the fd -nation X is not limited to the configuration ,-hown in the figures, and hence, the gna fee modified accordingly as the configuration of the lid portion 8 changes. [0048]

VO

8g can

In the embodiments, while the invention is described as being applied to ihe heat esehnnge; which makes ux* of exhuma gas ol -he interna! combustion engine,, the heat source to which? the invention is applied is not limited to the Internal ec engine, and ^[wm\, the inversion can be anphed to curious types of hen •mbustion t sources including an evtcrnu! combustion engine.

1, IA, IB Heat exchanger

Case pm non

2b Bottom portion

2d Projecting porsion

Catalyst

8, 1.8 hid portion

Exhaust gas flow channel

First exhaust oas flow channel

Ihi	t atari a accenunedui ng dsambe
lib,	lid, lie inner tube
He	Connecting flow channel
11 bd	Bottom anti bee
1 Ibe	Pmjtwnne, pmtien
12	Sewn.! exhanai gas fle·, channel
	Cenri-r An;

Claims

Claims

1. A heat exchanger. ec-mprising;

a bottomed case portion which holds a fluid; and an e.xhaust gas Hove channel which is provided inside of the case p-udon.

wherein heat is conducted iron) exhaust gas Hewing through the exhaust gas flow channel to the- fluid.

the exhaust gas How channel has:

a first exhaust gas How channel which: passes through tire inside of the ease portion:; and a second flow channel in a gas flow channel which winds spirally around the first exhaust gas pace w'herc the fluid inside the ease portion is held.

wherein the first exhaust gas flow channel and the second exhaust gna flow are connecteu nt hcrte?

The heat exchanger according to claim 1 whereat the second exhaust gas flow channel is made up of a single flow channel
3. The heat exchanger according to claim wherein tlte first exhaust gas flow el chamber which accommodates a catartsi tor heating constituents of die exhaust gas, and a bottomed mne! tube which surrounds the eaiah.st accommodating chamber to define a flow channel for the exhaust gas around the catalyst accommodating chamber.

lannel has a catalvst acconunodadtu?.
4, i: „ heat ·.\·.hanger avcordiue n · chain ?.

wherein a bottom surface of the inner tube is supported on a single point by a projecting portion which is formed on a bottom portion of the ease portion
5, i lie heat exchanger ,κ<. ordmg to. d tho m 4, wherein an outer dreoniCeteiittui surface m die meet tube has an uneven portion which matches an uneven configuration of the second exhaust gas flow' channel

5 ’ S <v , { v t

W ' c ' , C\ ' ,< ce
6» 1 t'c he ’f c w n a ge ac\i > 'n to a·o u. υ or > to o > 1 to 5 ,. >mg ta up a fid pmOi'-i which m pnwwkd on a aide ol tin aw pwnon winch het opposite to the bottom portion of the case portion, end whkh defines a space esubh-duttg t lounmnucatmu hunt the fnrt exhaust gas tkov d,annd io die second exhaust gas m-v, dmnnd whetein a groove directed toward an inlet port of the second exhaust gas flow channel is formed on an inner sus face of die lifi portion,
7. Hie he U ewhanget aeemdutg to am mt', of daens 1 toy vheo.m the first exhaust ga^c fl-nv channel and ihu second exhaust gas that channel are vonucelcd directh lo each etfim.

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Application No: GB1721429.7