Note: Descriptions are shown in the official language in which they were submitted.
2126S77
HOT WATER SU~PLYI~G APPARATU5
BRIEF DESCRIPTION CF TH~ ~RAWINGS
In the accompanying drawin,gs:
Fig.l is 2 pipir.g diagr2m illustrating an e~bodi-
ment of the present ir,ventiGr,;
Fig.2 ~s a vert1cal cr~ss sectional view illus-
tr~ting a pcrtion of the ho' wate. generating section in the
embodiment above;
Fig.3 is a diagram illustrating the state of heat
exchange generated by the cc~bustion g~s in the heating
chamber of the above;
Fig.4 is a vcrt.cal cross sectional view illus-
trating a portion of t~e ho~ wa~er generating section in
other embodiment; .
Fig . 5 is a vertical cross sectional view illus-
trating other embodiment of the present invention;
Fig. 6 is a diagram illustrating the state of heat
exchange generated by the cc~bustion gas in the heating
chamber of the above;
Fig.7 is a piping diagram Cor a conventional type
of hot water supplying apparatus belonglng to the s~me type
as that according to the present invention; and
~ ig. a is a vertical cross sectlonal vlew illus-
~rating a portion of the hot water generating section above.
2l26s7~
BACKGROUl'.'~D OF THE INVENTIO~
The present invGntlon relates to a hot ~ater
suFplyir,g appara~U5 LC~ holses, colle~tive houses such as
apa~tr,ent ~ouses, hotels, o~dinary buildings, and other
.yp s o. architecture having a number of living rooms there-
in s~ch as plants.
As the ~.ot wa-e, sup~lying appar~us 2s descrlbed
2bove, for instan~e the.e are types established as shown in
Fig.; ar,d Fig.4, and th.e hot w~ter supplyi~g apparat~s has a
1~ hGt w~ter generating section 1 ar,d a load section 2, 3nd in
the hot water generatina ~ection 1 and the load section 2
- are formed a flcw ger.er2'ing path 3 3nd a 102d flow path 4
respe~ti~ely, zn exi' ~f .he f~ow generating path 3 i5
cor.nected to an entrance of the load flow p~th 4 ~ith an
ou'ward flow path 4 ~ith an exit cf th,e load flow~ path 4
ccnnected to an entr2nce o, ~he flow gener2ting path 3 with
an inward flow path 6 having a circulation pump 7 t~ form a
circ~latir.g flow ~ath ~ith these flow p~ths, 3nd also a
water suppiying path 27 having a v~,~e 26 is ~onnected to
the inward flow path 6.
In ~he hot wa~er generating section 1 are provid-
ed a plurality of he~t exchangers 11'-1,2,3 (3 units in this
embodi~,ent ) each having a heater 1~ therein and heat sen-
sors 12-1,2,3 each provided in the d~wnstream therefrom in
the flow generating path 3 a~d controlllng operatlons of the
heater 10. In the load flow path in the load sec~ion 2 is
_ ~ ~1 2~ ~7~ '
provided a temperature insulatingfad~ust~ng valve 13, up-
stream and do~nstream sections thereof and a plutality of (2
ln this embodiment) 102d members 15 are _~nnected with a
~ranch flow path 14 wlth a calor~eter 16 provided in an
inward flo~ sectlon of t}lP branch flow path 14.
Fig.4 shows details of a pcrtion of the hot water
generating secti~n i, ~nd the he~t ex~hanges 11'-1,2,3 have
a heating can 18 ~espectively, and in this heating can 1~
are provided a high limit sensor 17 and a ~ater supply
sectio~ Zl with a heating chamber 19 ' arranged therein, this
heating cham~er 19' is hoilow ar,d cylindrical, a fl3me
supply poct ?~ of ~he heat~r 10 comprising a burner is
opened in one side lower section thereof ~.~ith an air ex-
haust port ~4 provided ln the upper section in another side,
an air exhaust pipe 20 ls connected to this air e~haust port
24r and also a heat exchanging se~ti~n 22 of the outward
flow path lZ 2re located inside and in the upper sec~ion of
the heating can 18- In the load member 15 are provided 3
hot wa~er supplier 31, a ~~ar~.er and other load equipment not
2~ ~hown herein respeftively, while a clear water path 30
having a ~ater cleaner Z8 and a clear water pump 29 is
connected ~o the inward flow path 6.
In the ~onventicnal type of hot water supplying
apparatus as described above, the temperature
insulating/ad~us~ing valve 13 is fully opened with the v31ve
26 opened to supply water via tbe water supply pa~h 27 into
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the circulating L;Ow pa.h until the circulating flow path is
filled ~ith water, then .he valve 26 ls closed, the circula-
tion pump 7 an~ the clean water p~mp 29 are a~tuated to
circul~te w~ter ins_de sa~d circulating flow path, and at
5 the same time .he heGter 10 in each of the heat exchangers
11'-1,2,3 is actuâted tc start heatlng ~he water.
~ Jhen tem~era.ure ~f the water reaches a specified
level after heating as ~escribed zbove, the temperature
insulatingfad~u ting val~re 13 i~ fully ~losed once, and ~hen
the temperature insulat1ngfad~st~ng valve 13 ls opened to
a~ openln~ degree ~here te~perature~pressure ~uges 39, 40
located be~ore and afte~ -he temperature 1nsulatina/adlust-
ing valve 13 show a precC_ro difference acrocs and 2 temper-
~ture in the t~rperatlre insulating/ad~usting valve 13
lndlcate a preset rnini.~,u3T~ flow ra~e. This opera~ion is
required for the fol~o~ino reassns; namely althcugh circula-
ticn of hot water is necessary even .n r.o loa~ condition
~here no hot water ls cor.su~ed in the load member 15 in the
load section 2, ~s a length of .he en.ire circulating ~lcw
path including fl~ ~aths in the hot ~ater generatin~ sec-
cion and the ioad se~t10.r~ Z ~s very la~ge, if the circul~-
tion flow rate is too hiah, h~at lcss due to heat emission
to outside 0c the pipe i-.creases in prcportion to the circu-
l~tion flow ra~e, ~nd for this reason also heat loss due to
heat emission by hot w~ter ~10wing thereln becomes larger,
~o that a flow rate of ho~ water flowing during no load
',',~ -
2126577
condition must be suppressed to as low le~el as possible by
way of preventiGn of heat loss, and furtherm~re this oper~-
tion is required to gener3te z large pressure difference
between the uFstrea" si~e and ~he dov.~nstream side of the
S temFerature insulatina/Gd~usting valve 13 for the purpose to
quickly supply h.ot wa~e- to the lsad ~ember 15 in no load
conditi~n.
If a hot ~.ater supply valve 3~ is opened in the
hot water s~Fplier 31 and ho~ water is consumed t~erein, a
1~ s~gnal from a pres~ure s~itch 33 is sent to a motor valve 34
si~ultaneously when tao water 15 supplied from a water
supply pipe 32 through the pressure s~itch 33, this motor
valve 34 is opened, hot water is supplied to the hot water
supplier 31, heat is exch~nged ir.stantly between this hot
water and the supplied tap ~ater r ar,d ho~ water is ~upplied
f~-om the hot water suppiy valve 35. Gn the other hand, when
the warme~ ls in service, the valve ~6 is opened with hot
water flo~ing thereint~, while wben the warmer 1s n~t in
~ervice, the valve 36 ls closed to prevent ~he hot water
ZO from flowing thereinto.
The hot water harneseed as described above passes
through the calorimeter 16, and is de~ected as a spent
heat value ln the load sec~ion ~. A prescribed temperatu~e
level is fixed in each of the heat sensors 12-1,2,3, and
25 when temperature of a liquid in the generating flow path 3
goes down to below the prescribed ~emperature, the heater 10
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ls actuated acccrding to a signal from the heat sensors
12-1,2,3 to heat the liquid supplied fr~m the water supply
section 21 ir.to t~e heat e~changers 11'~ , heat exchange
is per~ormed betwee~ 'his heated li~uid and liquid ~l~wing
in the ~eat exchange sec~lcn 22 in the flow gener~tlng path
3 with the liquid becomes hot, and on the contr~ry when
~emperature of a liquid in the flow gener~ting path 3
becomes hi~her ~!~an the pre~ribed level, operation ~f the
~.ea~er lC is stoppei acco~ding to a sign~l ~rom the high
limit sensor 17, and heating ~.e 11quld supplied from the
~ater s~pply section 21 into the heat exch~ngers 11'-l,Z,3
ls stopped. Dur~ng these operations, ~he circulation pump 7
contlnues to ~~ork for circulat1r.g the hot water in the
circulating flow pzth.
!5 In the conver.. ional type of hot water supplying
apparatus as deccribed above, temperature ~f hot water is
maintained a~ a ~escriL~cd le~el by adjusting a flow rate in
the temperature insulatin~/adjusting valve 13, and hot water
can instan~ly be flown int~ tl~e load ~,ember i5, but on the
other hand, as the heat exchangers 11'-1,2,3 are located off
from ~he circulat.on pump 7 by degrees, ~he pipe resistance
beco~,es larger by and by, and a flow rate of hot water
flowing ~hrough the heat exchangers beccmes smaller propor-
tionately, and (1) if tem~erature o~ hot water flowing in
~he flow generating pa~h 3 provlded therein the heat sensor
12-3 attached to the heat exchanger 11'-3 o~ the minimum
'~ 2126577
flux becomes lchler due to natural heat emission to o~tslde
of the pipe because of the extreme lowering of the flowing
speed, thereon the heat sensor 12-3 outputs a signal ~rres-
pective of the fact that 'e.~!perature of he~ted water inside
the he-ting can 18 is not too lcw, and operation of the
heater 13 is unnecessary, and (2) ~en a flow rate in the
heat exchanger ~ ke~o~.es lower, ho~ ~ater moves to nearer
an ent~ance of ~he heGt ex~har.ger 22 as indicated by a
dotted line in Fig.4 due to a liquid supplied from the water
sup~ly section 21 into the heating can 18 and circulzting
the hot water by ~onvection, and the hot water inside the
flow generatir,g path 3 flows i~ the reverse direction,
there~pon the heat ser.scr 12-3 outputs a signal. And the
signal generated by the :~eat sensor 12-3 is inputted into
the heater 10, and the he2ter 1~ is ctuated, consequentl~,
temperature of t~.e hot ~ater ln the heating c~n lB becomes
abr,ormally high, ~hich m3y give da~ages ~o the heat exc~ang-
er 11-3 besides i~ cOuses idling and trc~bles in the circu-
lation pump 7, and Lcr this reason sometimes the high limit
23 sensor may mOke a decislon that the te~per~ture is abnormal-
ly high, ~nd provokes to stop operation of the heat exchang-
er 11-3 which sho~uld nct be necessary to stop.
SUrr,MARY OF TH E: I NVE~T I ON
The present in~en~ion was made in the light of
the circu~.stances as described above, and lt is an cbject of
~ ~ 5 7 7
~he present invention to provide for solving the foregolng
pro~lems lnvolved in exis~ing hot ~ater s~pplylns apparatus,
that is flux of a 'luid flowing in the genesation 'low p~th
is not limited to a ~inimum flo~ rate, no d~mage is given to
~he he~t exchang~r because temperature of a hot water in the
heating can does not ~c ab~ormally high, there is no r.eed
for stopplng oper~ion o~ the heat exch~nger ~voiding ~nne-
cessary stopping, ~hus n~ ~roukle is generated due to idling
of the clrculation pump.
Furthermore, in an embodiment of the invention, there
is provided a hot water supplying apparatus having the following
characteristics. ~hile combustion gas generated in the
co~bustion ch2mber a'ter actuatiQn of the heat exchanger,
goe~ up ln the hea~ing chamber and then gces down and is
exh~usted from the exh~u~t port to ou~sLde, heat exchange is
performed between the combustion gas and a liquid in the
h~ating c~n installed on the external surface of ~he heating
ch2mber, the co~bustion ~as gives its heat to the liquid
throu~h this heat exch3nge, the downward Clo~ability becomes
hlghe~ th~reupon the combustion erfl~1ency raised and incom-
plete combustion prevented, and also the liquid in the
heating can senerates conv~c~on an~ ~oes up and down in the
hea.ing can, thus the heat ex~hange efficiency between the
combus~ion gas ~nd the liquid being i~proved and temperature
of the liquid being raised w1~hin a short period of time.
In order to achieve the objects as described
C
2126577
above, the presen~ inven~ion provides a hot water supplying
appazatus having ~ hot hater senerating section wlth a flo.
generatln~ path and ~ load sectisn with a load flow path in
which a conr,ec~ion ~lo~ path c~nnecting with said flow
generat ng p~th to said ~oad flo-~ pa~h i5 provlded with a
circula~ing Ll~w path ~.aving a circulation p~p therein
~orr,ed by these flo-.~ path,, a heat ex~anger having a heater
therein and a heat sensor ptovided in the flow gene~at~ng
path and contr~lling cFerzti~ns ~ ~he heate~ a~e proviGed
in the hot water generatins section, a temperature
insulating~adjust-n~ V~l'Je iS provided in the ioad flow
path, a branch flow path ccnneeting with the upstream side
from the t~per~ture ~n5~ ing ~alve to the do~ns~ream side
therefrom in said load flo~ path is prov~ded, ~nd a load
lS membe; is lcca~ed in thls ~ranch .low path; wherein a byFa~h
plpe having a flux cont~ol valve ccr,necting wi~h the up-
streqm side Lrom the r.eat exchanger to the do~nst~e2~ side
therefrom ls prcvlded in the conr.ection flow p~th des~ribed
above.
Also the present lnventlon provides a hot water
supplying spparatus havin~r in addition to th~se described
above, the feat~re that 3 heating chamber provided ln the
heat exchanger has a flame s~pply port of a heater opened in
the lo~er section ln one side and an exhaust port provlded
in the lowe~ sec~ion in the opposi~e side thereo~ a~d the
intermedlate sectlon bet.~ee~ the flame supp~y port and the
_ 2126577
exhaust port h~s an i~verted U-shaped form.
Furthermore the pres~nt lnvention provldes a hot
water supplylng ~ppzratus in which a flame supply port ~f
the heater .n the hea.ing chamber is losated ab~e the
exhaust port and the flame supply port ls sealed by the
heater.
In the hot ~ater supplying 2ppar~tus accorâ~ng to
the present invention as deccribed above, after the tempera-
ture insulatingf~djusting ~alve is fully ~pened and the
entire circ~lating flcw path ir.cludir.g the bypath flcw path
ls ccmpletely ~illed with ~;ater, the circulation pump is
actuated to circulzte ~ater in the clrculating flow path, at
the szme time the hcat exchanger is actuated to heat ~ater,
ar.d when te~perature o' the ~ater hezted 25 described above
goes up ~o a prescribed ;evel, the te~peratu~e irsulating/
ad;usting valve is opened to a p~eccribed angle so that the
pressure difference ~et~;een hot ~ater be~ore and ~fter the
temperature insulating/adiustir.g valve 2S ~ell 2S tempera-
ture therein indicate a mini~um fl~x previously prescribed
and when temperGture of a liquid in the ~low generating
path ~oes down below the prescribed le~el, ~he heat exchange
is actuated to h at hater, and on the contrary when tempera-
,ure o~ the li~uid in the flcw gGneratin~ pzth beco~,es
higher than the prescribed level, operation of the heat
exchanger is stoFped, thus the operation for heating water
being stopped.
'~ 2~26577
During these s-eps, the circulation pump is
always working so a~ to c~rculate h~t water between cutw~rd
~lcw paths and inward '19-~ ~aths as well as to make hot
water flow thrcush the ~p~th flow pat~, and with these
operations flux of hot water flo~ing ints the heat e~changer
in the hot water gene~atina ~ection is increased. ~n this
5'~-p, when the h,eater in the heat exchanger is ~ctuated,
cor,bustion gas aenerated in the heati~g ch~m~er goes ~p and
t~le~ goes do~n ln th~ hea~ing ch2mber cnd ls exhaustod via
the exhaust por~ through the exhaust pipe to the ~utside.
Lhus du~ing the period ~hen the ~ombustion gas ac,es up and
coes down in the hezting chamber, he~t exchange is perlormed
be~ween the combustio~ aas and the liquid in the heating ca~
c,. the exte~nal surface of the heating cha~ber, and because
o~ this heat exchan~e the ~cmbustion gzs especially in the
downflow section supplies heat to the llquid inside and
ou~side thereof, the downflcw flow2bility being raised, and
durin~ this step, thG liquid in the heating czn generates
convection, going up and down in the heatlng can, thus t~e
heat e~chznse efflciency between the combustion ~as and the
li~uid belng raised, and furthermore the combu3tion gas
stays inside the heat exchanger even when operation of the
heat ex~hanger is down, t~.us per~ea~ion of cool air from
outside being prevented.
2126577
~SCRIPTIO~ OF TH~ P~EFERRED ~MBODI~i~NTS
The e~bsdimen~s of the present invention sh~wn in
Fig.l and Fig.2 have, in I~Ost porti~ns thereo. r almost the
same configuration as thc~ of t~e conventional type of hot
water supplying ~pparatus as descrlbed above, so that the
came reference nume~als are assigned to such pcrtions and
description concernlr~ the portlons is ~mitted hereln. and
des~iption is ~.ade m~nly f~r the different portions.
~etween the outward flow path 5 and the in~atd flow path 6
is pr~ided a bypath flc~ pa.h 9 having a flux control valve
9 connecting with '~ie upstrea~ side from the heat exchangers
11-1,2,3 to the d~nstrozm si~e therefrom. Furthermore
inside the hea.ing can lS ~f the heat exchzn~ers 11-1,2,3 is
opened a flame supply port of the heater 10 in the lower
sectlon in one side thereof, -~hile 'he exhaus- port 24 is
provided in the lo~er sec..on in ano~her slde th~reof, znd
the intermediate seetlcn bet~een ~he flame support port and
the exhaust port ~as an inverted U-shaped fcrm to form the
heating chamber 19.
I~ the hot water supply apparatus as described
above, like in ~he convcntional tj~pe, after the temperature
insulating/adjusting valve is fully opened and the entire
circulating fl~w ~zth is co~pletely filled with water, the
circulation pu~p 7 is aet-iated t~ circulate ~ater in the
circulatir,g fl~w pzth therethrough, ~ the same time the
heat exchanges 11-1,2,3 are actuated t~ heat water, and w~en
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temperature ~f .hP water h2ated as described above goes up
~o a prescribed level, the te~,perature insulat~ng/adjustlng
valYe 13 is opened to a ~rescribed angle where the pressure
difference of the hot wa~er in fror,t and rear of the valve
13, and temperature ln the ;e~,per~ur~ insul2ting/adjusting
~al~ve 13 indlcates z prescri~ed minimum ~10w rzte. ThJs,
when te.~perature of a ilqiid in the flow generatlng path 3
becores lo~er th r, the Firescribed level, the he~t exc~.angers
11-1,2,3 are ac~uzted ~c hea' w2ter, and on the contrary
when te~,perature of a l .~uid in the flow genera~ing path 3
becomes higher than the prescrib~d level, operation o~ the
heat exchangers ll-l,Z,3 are stopped, thus operation for
heating water teing stcpped.
During these steps, the circul~tion pump 7 i5
~lways ~crkir.~ .o circul~te hot water through the outward
flcw path 5 and inwa~d f'ow path 6 and also thr~ugh t~e
b~path flow pat~. ~, and ~.ith this operaticn flux of water
flcwn into the hot wa~er ~enerating section 1 increases,
which in tur~ makes it possible to prevent heated water i~
2~ the heating cans fr~m ~eing heated to an abr.or~al hioh
degree due to shortage o_ the flux, and for ~his re2son
there is nc pocslbillty that any damage ls ai~en to the heat
exchanges, the necessit~ to stop operation of the heat
exchangers is eliminated ~.~hen it is unnecessary, and also
troubles due to ldling of the circulation pump is preven~ed.
If the heater 10 of the heat excha~gers 11-1,2,3
'- 2126577
showing in Fig.2 are actuated in the step described above,
combustion gas generated in the hea~ing chamber 19 goes up
through th~ ~pflow seCtion 41, ent~rs the upper distri~ution
sectlon 43, then turns aroun~ and goes do~;~ through the
5 do~,nflow section 42, and is exh3usted via the ex~,aust port
Z4 throuqh the exhaust pipe to the outslde. T~e heat
exchanger proposed by the present applic~nt and disclo~ed in
J2panese Utility M~del No.55-42216 is similar t~ the heat
exchanger 11, and in this type ~f he~t exch~ger a pheno~e-
r.cn ~alled up/do~n flo~ o. co~kust1~n gas occurs, so th~t
descript~on is made bel~-~ fot th~s pheno~enon referrir,g to
Fig.3.
It ls known tha. cor,bustlon gas generated after
actuation of the heate~ 10 gener~tes the internal aeration
force Pch sho~n by the following equatio~s ~1) and ~2)
irrespective o~ the sta~e of peripheral air in a scS cor,bus-
tion path having the up'low sect'on 41 as well as the down-
flow section 42 with the ca.~e height H as that ~f the upfl~w
section 41 in the heating chamber 19:
Pch = ( Yd - Yu). H ~1)
Pch = PH/R (l/Td - l/Tu) (2)
herein yd: Specific weight of combustion gas in the
~5 downflo~ section 42
yu: Speclflc wei~ht of combustion gas in the
14
7 ~ ~
upflow section 41
H: Height H from the heat generating point U
at the middle point M
P: Pressure of combustion gas
R: Combustion gas constant
Td: Temperature of combustion gas in the
downflow section 42
Tu:- Combustion gas temperature in the upflow
gas section 41.
When the heat exchanger 11 is working, in other
words when the heater 10 is working, always the relation of
Tu > Td is satisfied, so that (l/Td - l/Tu) ~ 0, and the
combustion gas flows from the heat generating point U to the
middle point M and then to the exhaust point D. In contrast
to it, when operation of the heat exchanger 11 is down, Tu
is equal to Td as well as to temperature of the peripheral
water, and for this reason the internal aeration force Pch
becomes 0 (zero) with the combustion gas flow in the combus-
tion gas flow path stopped, which prevents permeation of
cool air from outside to maintain the internal temperature.
Fig.4 and Fig.5 show other 2 examples of the
heat exchanger 11 (called Example 2 and Example 3 respec-
tively), and in these examples as the exhaust point D is
located at a position lower by h than the heat generating
point because of the construction of the architecture in
7 ~
._
whish the hot ~ater supplying point is installed a~ chs~n in
Fig.5, th.e exhaust point D is loca~ed at a ~osition by h
lo~er t~n the heat generatin~ point U ~s shown in Fig. 6,
and ~or ~lis re~ssr., pressure at psint~ U,M and D ~re Fu,Pm,
5 ar,d Pd respe~tivel~, the f~l lo~.Ji~n.g ec~ua~ions are prcvided:
Pd = Pm * J yd.dh (3
Pu = Fm + J ïu.dH - Pm + yu.'~ ~4
and hereir, Pd is reloa2ed to ~he atrr.osphere, so that Pd
is equal to PQ (Atmos~'r.erli- preCsure~. Acr~rdingly also
the foll~wlna equa~i ons are prsvldPd:
Po = Pm +yd.H + yd.h ~S)
Pm = Po -yd.H -yd.h (6)
~ y subs~ituting equatiGns (5) ~nd (6) into equ~-
tion (4). the foll~ irlg eciuaticn is obtain~d:
~u = PO ~'r' d.H ~y d.h ~ YU.H = PG - rd.h (7~
Herein ~hen spera~ ion o~ the heat ex-hc.-J~e~ 21 is
down, Y d is Gqu~l to y u, so that Pu = ?o - y d.h, n3m~1y
Pu - P~ ~ ~ Y d.h < 9, ~nd for ~his reason the relaticn of
16
5 7 ~
Pu < Po ls always s~tic'ied, and the combustion g~s in the
combustlon g3s flo~ path always flo~s ~rom the exhaust point
D ~o the mlddle polnt t~ and then to th~ hea~ generating
polnt ~ without staying in the co~bus~io~ g~s ~low path, so
~hat permeation of external air c~n not be prevented and
heat of hot water ~n the heatirig ~an 18 is disadvantageously
D~itted to outside. In other words, when operation of the
heater lC is stopped, theore~ically the internal combustion
gas tries to 'lo~ from .he exhaust point ~ to the middle
1~ pint M and t~en to the heat generating point U, n~meiy in
the direction contrary a that when the heat exchanger 2 is
~orking, for goir,g out o' the app~ra~us, like in the conven-
t,onal type of hot water supplying zpparatus. In these 2
ex~mples, h~ver, the heater 10 ls loc~ted ~t the fla~,e
supply port Z~ ~o prever.t g~s distrlbution therethrough, so
th~t the co~bustion aaS s~agnates inside the heating chambe~
19, which prevents per~.e~tl~n o~ exte~nal cool 3ir and
m~intains the internal temperature, th~s tempera~u~e of hot
water in the heating czn 18 not being emit~ed to outside.
It sh~uld be n~ted that, in Example 3, the do~n~low section
42 is located outside the heating can 18 and this downflow
section 42 is covered by a heat insulating ma~erial 44.
The present invention is as described above, and
furthermore, a generating flow path in a heat generating
25 section is connected with a load flowpath in a load section
with a con-
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~7~;77
nection flow path, a c~rculating flow path having a clrcula-
tion pump thereln ls formed by ~he~e flo~ paths, heat ex-
~h~ngers ea~h h~v.n~ a he~ter thereln and a hezt ser.sor
provided in .he flow ger, r~ting path znd controlling oper~-
5 tion of the he~ters are pro~rided in the hot water generatingsection, a temp~r~ure insul~ing/~d justing valve is provid-
ed in the load ~lo~ path, a br3nch flow path conne~ting with
the upstream side from the temper~ture insulating/ad~usting
valve to the downstrez~ side therefrom is provided in the
102d flow p~th, a ~cad mem~er is pro~ided i~ .hls branch
flow path, and a bypath pipe ha~ing a flow rate c~ntrol
vdive ~nne~ting with th~ upstr~m slde from the h~t ex-
changer to the down~tream side therefrom is pr~vi~e~ in the
connDctlon f,ow p~th, s~ tha~ flux of a fl~id flowir.g in the
flo-~ gener~ting pat~ is not limited to the minimum flux and
any damage due to abnormally hlgh temper~ture of hot water
ln the heati~g can is not given to the heat exch~nger,
t~e~eon the r,e~essity of stopping operation of the he2t
exchanger is eli~inated when it is not required, and zlso
troubles due to idling of the circulation pump can be pre-
vented.
In another embodiment described in addition to the
features described above there is provided hot water supplying
apparatus according to Claim 1, a feature that a heating
25 chamber provided in the heat exchange has a flame supply port
of a heater opened in the lower
C
section in one side thereof and an exhaust port in the lower
section in another side to thereof. The intermediate section
between the flame supply port and the exhaust port has an
inverted U-shaped form. For this reason this other embodiment
of the hot water supplying apparatus has the additional merit
that while combustion gas generated in the combustion chamber
after actuation of the heat exchanger goes up and then goes down
in th~e heating cha~ber and is exh3usted from the exhaust
por~ to the outside, hea' exch~nge is performed bet~een the
co.~.bus~ion g~s and a li~uid in the heating ~an on the exter-
nal surface of the heatlng .h2~ber, the ~ombustion gas in
the hea~ing chamber suppiied hea~ to a liquid inside and
outslde tkereof through the heat e~change, the dowfi~a~d
flo~ab1lity is improved with ~he combustion e~fic~ency
ral~ed and al~o incnmplete combustion prevented, ,n addition
to a liquid in the hea~ing chambe~ circulates upflo~/do~n-
flGw ccr,vection .herein to raise the beat exchange efficien-
cy be.ween the combu~tion gas and the liquid with tempera
t~re cf the li~uid raised ~uickly, and also that, even whenoperation of the heat exchznger is stoppe~ and the combus-
tion gas tries 'o flow out~ard, a combustion app~ratus
provided in the flame s~pFly port pre~en~s dis~rikution of
~ he ~ombustlon gas, and the combustion gas s~ays inside the
heat exchanger, thus permeation of cool air from outside
being prevented and ~he in~ernal temperature being maln-
19
C
- 2126577
tained at a const~nt level.
~0
