SE1451253A1 - Expansion tank and cooling system including such an expansion tank - Google Patents
Expansion tank and cooling system including such an expansion tank Download PDFInfo
- Publication number
- SE1451253A1 SE1451253A1 SE1451253A SE1451253A SE1451253A1 SE 1451253 A1 SE1451253 A1 SE 1451253A1 SE 1451253 A SE1451253 A SE 1451253A SE 1451253 A SE1451253 A SE 1451253A SE 1451253 A1 SE1451253 A1 SE 1451253A1
- Authority
- SE
- Sweden
- Prior art keywords
- coolant
- basin
- inlet
- guide member
- settling basin
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/029—Expansion reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/028—Deaeration devices
Abstract
28 ABSTRACT An expansion tank (1) which is to be included in a cooling systemof a motor vehicle and comprises: - an expansion chamber (3) with a lower part (3a) foraccumulation of coolant and an upper part (3b) for accumulationof air; - an in|et opening (6) to be connected to a vent conduit of thecooling system; - an in|et basin (7), which is arranged in said upper part (3b) ofthe expansion chamber and configured to receive the coolantwhich flows into the expansion chamber via said in|et opening;and - a settling basin (8), which is arranged in said upper part (3b) ofthe expansion chamber and connected to the in|et basin, whereinparticulate contaminants contained in the coolant received in thesettling basin is allowed to settle at the bottom of the settling basin under the effect of gravity. (Fig 6)
Description
Expansion tank and coolinq svstem comprisinq such
an expansion tank
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to an expansion tank according tothe preamble of claim 1 which is intended to be included in acooling system of a motor vehicle. The invention also relates to acooling system for a motor vehicle provided with such an
expansion tank.
A combustion engine of a motor vehicle is cooled by means of
coolant which is circulated in a cooling system. When thecombustion engine is in operation it gives off heat to the coolant,which is thereby heated and expanded. The resulting totalvolume increase of the coolant in the vehicle's cooling systemmay amount to several litres and depends on the original coolantvolume and the temperature increase. ln order to prevent thepressure from increasing too much in the cooling system, thecooling system is provided with an expansion tank which canaccommodate the surplus coolant generated in connection withthe expansion of the coolant. The boiling point of the coolantrises with increasing pressure, and it is therefore desirable tomaintain a certain positive pressure in the cooling system whenthe engine is in operation to thereby prevent coolant boiling. Tomake this possible and at the same time prevent a dangerouslyhigh coolant pressure, the expansion tank is provided with apressure relief valve which ensures that the pressure in the
expansion tank cannot exceed a predetermined pressure level.
When the coolant expands as a consequence of heating, the airin the expansion tank is compressed and the pressure in theexpansion tank and in the rest of the cooling system is thereby
increased.
Another important function of an expansion tank of the above-mentioned type is that it should be possible for the coolantreceived in the expansion tank to be deaerated in the expansiontank before leaving the expansion tank. The air which has beenabsorbed by the coolant when circulating through the coolingcircuit of the cooling system and which therefore accompaniesthe coolant to the expansion tank is intended to rise to thesurface of the coolant volume received in the expansion tank inorder to accumulate in an air-filled space at an upper part of theexpansion tank. Hereby, the coolant in the expansion tank is
deaerated.
Some cast components included in a combustion engine of amotor vehicle have a very complex construction with narrowducts and grooves and it is therefore difficult to completely cleansuch engine components from all foundry sand particles andmetallic particles. Such remaining particles and other particulatecontaminants may be mixed with the coolant when the coolantflows through the coolant ducts in the combustion engine andthrough other parts of the cooling system. Narrow ducts indifferent components included in the cooling circuit of the coolingsystem, such as for instance ducts in heat exchangers, valves orthermostats, may become clogged by particulate contaminantsflowing through the cooling circuit together with the coolant. Suchclogging may damage
the components and/or impair the
functioning thereof. Furthermore, the particulate contaminantsmay cause increased wear of the components included in thecooling circuit. lt is previously known to catch such particulatecontaminants by means of a particulate filter arranged in thecombustion engine. However, a disadvantage with such aparticulate filter is that it may become clogged and therefore
requires recurrent maintenance.
OBJECT OF THE INVENTION
The object of the present invention is to achieve a new andadvantageous manner of removing particulate contaminants from
coolant circulating through a cooling circuit of a cooling system.
SUMMARY OF THE INVENTION
According to the present invention, the above-mentioned objectis achieved by an expansion tank having the features defined in
claim 1.
The expansion tank of the present invention comprises:
- an outer casing;
- an expansion chamber enclosed within the casing, wherein theexpansion chamber comprises a lower part, in which coolant is tobe accumulated, and an upper part, in which air is to beaccumulated;
- an inlet opening, here denominated first inlet opening, which isarranged in the casing and intended to be connected to a vent
conduit of said cooling system in order to allow coolant and air to
flow into said upper part of the expansion chamber via this firstinlet opening;
- an outlet opening which is arranged in the casing and intendedto be connected to a coolant conduit of said cooling system inorder to allow coolant to flow out of said lower part of theexpansion chamber via this outlet opening;
- an inlet basin, here denominated first inlet basin, which isarranged in said upper part of the expansion chamber; and
- a settling basin arranged in said upper part of the expansionchamber.
The first inlet basin is configured to receive the coolant whichflows into the expansion chamber via said first inlet opening. Thefirst inlet basin is connected to the settling basin by a flowpassage, via which coolant may flow from an upper part of thefirst inlet basin and down into the settling basin, whereinparticulate contaminants contained in the coolant received in thesettling basin is allowed to settle at the bottom of the settlingbasin under the effect of gravity. The settling basin is providedwith an outlet, via which coolant may flow from an upper part ofsettling basin and further on towards said lower part of the
expansion chamber.
The coolant flowing into the expansion tank via the first inletopening is initially accumulated and spread out in the first inletbasin before flowing from an upper part of the first inlet basinand down into the settling basin. Particulate contaminantscontained in the coolant entering the expansion chamber via thefirst inlet opening cannot settle in the first inlet basin due to thefact that the flow of coolant in the first inlet basin is too turbulent.
However, the flow of coolant in the settling basin is sufficiently
calm to enable a settling of particulate contaminants at thebottom of the settling basin under the effect of gravity. Thus, withthe solution according to the present invention, particulatecontaminants may be removed from the coolant in a simple andcost-efficient manner without having to use any particulate filter
that may become clogged.
According to an embodiment of the invention, the flow passagebetween the first inlet basin and the settling basin comprises aguide member, here denominated first guide member, whichextends between the first inlet basin and the settling basin andalong which the coolant is to flow when passing from the firstinlet basin to the settling basin, wherein this guide memberslopes downwards towards the settling basin. The coolant flowinginto the expansion chamber via the first inlet opening issubjected to an initial deaeration in the first inlet basin in that airbubbles rise to the surface of the coolant accumulated in the inletbasin and join the air in the air-filled upper part of the expansionchamber. The coolant is then subjected to a further deaerationWith a suitable
dimensioning of the first inlet basin and the first guide member in
when flowing over the first guide member.
relation to the flow of coolant through the first inlet opening, thelayer of coolant formed on the first guide member will be so thinthat the air bubbles accompanying the coolant flowing along thefirst guide member very easily can join the air above the firstguide member. The coolant is thereafter subjected to a furtherdeaeration in the settling basin in that air bubbles rise to thesurface of the coolant accumulated in the settling basin and jointhe air in the air-filled upper part of the expansion chamber. By
making the coolant pass the first inlet basin, the first guide
member and the settling basin, it will be possible to achieve anefficient deaeration of the coolant in a space-saving mannerbefore it is accumulated in the lower part of the expansionchamber, where it is subjected to a final deaeration before
leaving the expansion chamber.
According to another embodiment of the invention, the first guidemember is flat and slopes downwards towards the settling basinat an angle of 5-15°, preferably 5-10°, in relation to the horizontalplane. Hereby, the first guide member slopes gently downwardsand the flow velocity of the coolant along the first guide memberis thereby limited, which is advantageous with respect to thedeaeration.
Another embodiment of the invention is characterized in:
- that the settling basin extends between a first wall located at aninlet end of the settling basin and a second wall located at anoutlet end of the settling basin;
- that the outlet of the settling basin has an outlet edge providedon said second wall; and
- that the settling basin comprises an inlet having an inlet edgeprovided on said first wall, wherein the inlet edge is located at ahigher elevation in the expansion chamber than the outlet edgeto thereby allow the coolant flowing over the inlet edge to fallvertically down into the settling basin. By falling vertically downinto the settling basin, the coolant entering the settling basin isprevented from “sliding” directly from the inlet end to the outletend of the settling basin at the upper surface of the coolantpreviously accumulated in the settling basin, and it is thereby
ensured that the coolant entering the settling basin will get mixed
with the coolant previously accumulated in the settling basin andremain in the settling basin for a period of time that is sufficient
with respect to the settling process.
According to another embodiment of the invention, a second in|etopening is arranged in the casing and intended to be connectedto a vent conduit of said cooling system in order to allow coolantand air to flow into the expansion chamber via this second in|etopening, wherein the expansion tank is so configured that thecoolant entering the expansion chamber via the second in|etopening is allowed to flow to said lower part of the expansionchamber without passing the first in|et basin and the settlingbasin. Hereby, only a part of the total vent flow will pass the firstin|et basin and the settling basin, which will make it possible toobtain a reduced coolant flow through the settling basin andthereby favourable conditions for the
settling particulate
contaminants.
Another embodiment of the invention is characterized in:
- that a second in|et basin is arranged in said upper part of theexpansion chamber, wherein this second in|et basin is configuredto receive the coolant which flows into the expansion chambervia said second in|et opening; and
- that a second guide member is connected to the second in|etbasin, wherein coolant may flow from an upper part of the secondin|et basin and further on towards said lower part of theexpansion chamber via this second guide member.
Hereby, the coolant flowing into the expansion chamber via thesecond in|et opening is subjected to an initial deaeration in the
second in|et basin in that air bubbles rise to the surface of the
coolant accumulated in the second inlet basin and join the air inthe air-filled upper part of the expansion chamber. The coolant isthen subjected to a further deaeration when flowing over thesecond guide member. By making the coolant pass the secondinlet basin and the second guide member, it will be possible toachieve an efficient deaeration of the coolant in a space-savingmanner before it is accumulated in the lower part of theexpansion chamber, where it is subjected to a final deaeration
before leaving the expansion chamber.
According to another embodiment of the invention, the secondguide member is undulated and has at least one crest whichdirection of the
extends perpendicularly to the longitudinal
second guide member. With a suitable dimensioning of thesecond inlet basin and the second guide member in relation tothe flow of coolant through the second inlet opening, the layer ofcoolant formed on the crest of the second guide member will beso thin that the air bubbles accompanying the coolant flowingover this crest very easily can join the air above the second
guide member.
Another embodiment of the invention is characterized in:- that a third guide member is arranged in the expansionchamber below the second guide member, wherein this thirdguide member slopes downwards from an upper end located insaid upper part of the expansion chamber to a lower end locatedin said lower part of the expansion chamber; and
- that the second guide member is connected to the third guide
member by a flow passage, via which coolant may flow from a
lower end of the second guide member and fall down onto thethird guide member.Thus,
expansion chamber via the first and second inlet openings will be
the coolant which flows into the upper part of the
directed by the third guide member down into the coolantaccumulated in the lower part of the expansion chamber and maythereby slide down into the coolant accumulated in the lower partof the expansion chamber in a rather gentle manner. Hereby,only a very small amount of air will be drawn down into thecoolant accumulated in the lower part of the expansion chamberwhen the coolant from the upper part of the expansion chamberenters the coolant accumulated in the lower part of the expansion
chamber.
Further advantageous features of the expansion tank of thepresent invention will appear from the following description and
the dependent claims.
The
features defined in claim 12.
invention also relates to a cooling system having the
Further advantageous features of the cooling system of thepresent invention will appear from the following description and
the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, a specific description
of preferred embodiments of the invention cited as examples
follows below. ln the drawings:
Fig 1
Fig 2
Fig 3
Fig 4
Fig 5
Fig 6
Fig 7
is a perspective view from the front of an expansiontank according to an embodiment of the present
invenüon,
is a perspective view from behind of the expansiontank of Fig 1,
is a perspective view of a rear piece which forms partof the expansion tank of Fig 1,
is a front view of the rear piece of Fig 3,
is a perspective view of a front piece which forms partof the expansion tank of Fig 1,
is a schematic front view of the rear piece of Fig 3,
and
is an outline diagram of a cooling system comprising
an expansion tank according to the present invention.
DETAILED DESCRIPTION OF EMBODIMENTS OF THEINVENTION
An expansion tank 1 according to an embodiment of the present
invention is i||ustrated in Figs 1-6. This expansion tank 1 is
intended to be included in a cooling system of a motor vehicle,
for instance a cooling system 40 of the type i||ustrated in Fig 7.
The expansion tank 1 comprises an outer casing 2 of rigid
11
material, for instance plastic, and an expansion chamber 3 (seeFigs 4 and 6) provided inside the casing. The expansion chamber3 is separated from the surroundings by the casing 2 andcomprises a lower part 3a, in which coolant is to be accumulated,
and an upper part 3b, in which air is to be accumulated.
ln the illustrated example, the casing 2 is formed by a rear piece2a and a front piece 2b, which are secured to each other by hot
plate welding or in any other suitable manner.
The casing 2 is provided with an outlet opening 4 (see Figs 3, 4and 6) which is intended to be connected to a coolant conduit ofa cooling system in order to allow exchange of coolant betweenthe expansion chamber 3 and other parts of the cooling systemvia this outlet opening 4. The outlet opening 4 is located at thebottom of the expansion chamber 3. A pipe 5 connected to theoutlet opening 4 protrudes from the underside of the casing 2.
Said coolant conduit is intended to be connected to this pipe 5.
The casing 2 is provided with a first inlet opening 6 which isintended to be connected to a vent conduit of said coolingsystem in order to allow coolant and air to flow into the upperpart 3b of the expansion chamber 3 via this first inlet opening 6.A first inlet basin 7 and a settling basin 8 are arranged in theupper part 3b of the expansion chamber 3. The first inlet basin 7is configured to receive the coolant which flows into theexpansion chamber 3 via the first inlet opening 6, wherein thiscoolant may be temporarily accumulated in the first inlet basin 7before passing on towards the settling basin 8. The first inlet
basin 7 is connected to the settling basin 8 by a flow passage 9,
12
via which coolant accumulated in the first inlet basin 7 may flowfrom an upper part of the first inlet basin 7 and down into thesettling basin 8. The settling basin 8 is configured to receive thecoolant which flows from the inlet basin 7 via the flow passage 9,wherein this coolant may be temporarily accumulated in thesettling basin 8 before passing further on towards the lower part3a of the expansion chamber. The settling basin 8 is providedwith an outlet 10, via which coolant accumulated in the settlingbasin 8 may flow from an upper part of settling basin and out ofthe settling basin. Particulate contaminants contained in thecoolant accumulated in the settling basin 8 is allowed to settle at
the bottom of the settling basin under the effect of gravity.
The settling basin 8 extends between a first wall 11 located at aninlet end of the settling basin 8 and a second wall 12 locatedopposite said first wall 11 at an outlet end of the settling basin 8.Coolant enters the settling basin 8 via an inlet at said inlet endand leaves the settling basin via the outlet 10 at said outlet end.The inlet of the settling basin 8 has an inlet edge 14 provided onsaid first wall 11, wherein the coolant flows over this inlet edge14 when entering the settling basin 8. The outlet 10 of thesettling basin 8 has an outlet edge 15 provided on said secondwall 12, wherein the coolant flows over this outlet edge 15 whenleaving the settling basin 8. The inlet edge 14 is located at ahigher elevation in the expansion chamber 3 than the outlet edge15 to thereby allow the coolant flowing over the inlet edge 14 tofall vertically down into the coolant previously accumulated in the
settling basin 8.
13
The above-mentioned flow passage 9 comprises a first guidemember 16, which extends between the first inlet basin 7 and thesettling basin 8 and along which the coolant flows when passingthrough the flow passage 9 from the first inlet basin 7 to thesettling basin 8. The first guide member 16 is preferably flat andslopes downwards towards the settling basin 8 at an angle oi (seeFig 4) of 5-15°, preferably 5-10°, in relation to the horizontalplane. ln the illustrated example, the upper end of the first guidemember 16 is connected to an upper end of a curved wall 17 ofthe first inlet basin 7, whereas the lower end of the first guidemember 16 is connected to the above-mentioned first wall 11 ofthe settling basin 8. The upper end of said curved wall 17 formsan upper edge 18 (see Figs 4 and 6) of the first inlet basin 7 andthe first inlet opening 6 is provided in the first inlet basin 7 at alevel below this upper edge 18 so that the coolant flowing intothe expansion chamber 3 via the first inlet opening 6 will riseupwards in the first inlet basin 7 and then over to the first guide
member 16 via this upper edge 18.
A drain hole 19 is provided in a lower part of the first inlet basin7 to thereby allow coolant accumulated in the first inlet basin 7 tobe drained off from the first inlet basin via this drain hole 19when the flow of coolant into the expansion chamber 3 via the
first inlet opening 6 has stopped.
ln the illustrated embodiment, the casing 2 is also provided witha second inlet opening 20 which is intended to be connected to avent conduit of said cooling system in order to allow coolant andair to flow into the upper part 3b of the expansion chamber 3 via
this second inlet opening 20. The flow of coolant into the
14
expansion chamber 3 via the first inlet opening 6 is intended tobe lower than the flow of coolant into the expansion chamber 3via the second inlet opening 20 and the cross-sectional area ofthe first inlet opening 6 is therefore preferably smaller than the
cross-sectional area of the second inlet opening 20.
A second inlet basin 21 is arranged in the upper part 3b of theexpansion chamber 3. The second inlet basin 21 is configured toreceive the coolant which flows into the expansion chamber 3 viathe second inlet opening 20, wherein this coolant may betemporarily accumulated in the second inlet basin 21 beforepassing on towards the lower part 3a of the expansion chamber.Coolant entering the expansion chamber 3 via the second inletopening 20 is directed to the lower part 3a of the expansionchamber without passing the first inlet basin 7, the first guide
member 16 and the settling basin 8.
A second guide member 22 is connected to the second inletbasin 21, wherein coolant accumulated in the second inlet basin21 may flow from an upper part of the second inlet basin 21 andfurther on towards the lower part 3a of the expansion chamber 3via this second guide member 22. The second guide member 22is arranged below the first guide member 16 and the settlingbasin 8. ln the illustrated example, the second guide member 22is undulated and has a crest 23 which extends perpendicularly tothe longitudinal direction of the second guide member 22. Anupper end of the second guide member 22 is connected to anupper end of a curved wall 24 of the second inlet basin 21. Theupper end of said curved wall 24 forms an upper edge 25 (see
Figs 4 and 6) of the second inlet basin 21 and the second inlet
opening 20 is provided in the second inlet basin 21 at a levelbelow this upper edge 25 so that the coolant flowing into theexpansion chamber 3 via the second inlet opening 20 will riseupwards in the second inlet basin 21 and then over to the secondguide member 22 via this upper edge 25. The top of the crest 23is located at a slightly lower elevation in the expansion chamber3 than the upper edge 25 of the second inlet basin 21. A wavetrough 26 is formed between the upper edge 25 of the secondinlet basin 21 and the crest 23, wherein coolant flowing along thesecond guide member 22 will be temporarily accumulated in this
wave trough 26 before flowing over the top of the crest 23.
The settling basin 8 is connected to the second guide member 22by a flow passage 27, via which coolant may flow from the outlet10 of the settling basin 8 and fall down onto the second guide
member 22.
ln the
arranged in the expansion chamber 3 below the second guide
illustrated embodiment, a third guide member 28 ismember 22. This third guide member 28 slopes downwards froman upper end 28b located in the upper part 3b of the expansionchamber 3 to a lower end 28a located in the lower part 3a of theexpansion chamber. The second guide member 22 is connectedto the third guide member 28 by a flow passage 29, via whichcoolant may flow from the lower end 22a of the second guide
member 22 and fall down onto the third guide member 28.
A drain hole 37 is provided in a lower part of the second inletbasin 21 to thereby allow coolant accumulated in the second inlet
basin 21 to be drained off from the second inlet basin via this
16
drain hole 37 when the flow of coolant into the expansion
chamber 3 via the second inlet opening 20 has stopped.
ln the illustrated example, a pipe socket 32 connected to the firstinlet opening 6 and another pipe socket 33 connected to thesecond inlet opening 20 protrude from a side wall of the casing 2.Each pipe socket 32, 33 is connected to the associated inletopening 6, 20 via an inlet conduit 34, 35 provided on the outsideof the casing 2, as illustrated in Fig 2. The above-mentioned ventconduits are intended to be connected to these pipe sockets 32,33.
The expansion tank 1 is provided with a closable refill opening 34(see Fig 1) which is arranged on the casing 2. Coolant may beintroduced into the expansion chamber 3 via this refill opening 34in order to provide for replenishment of the cooling system. Thisrefill opening 34 is closed by means of a removable lid (notshown).
Furthermore, the expansion tank 1 is provided with a valvedevice 35 which is mounted to the casing 2 and comprises apressure relief valve for limiting the pressure in the expansionchamber 3 and a return valve. The pressure relief valve allowsair and vapor to flow out from the upper part 3b of the expansionchamber 3 when the pressure in the expansion chamber, due toan increase of the coolant volume, exceeds a pressure levelgiven by the pressure relief valve. Thus, the pressure relief valveensures that the pressure in the expansion chamber 3 cannotexceed a predetermined pressure level. The return valve allows
air to flow into the upper part 3b of the expansion chamber 3
17
from the surroundings when the pressure in the expansionchamber, due to a reduction of the coolant volume, becomeslower than a pressure level given by the return valve.
ln the illustrated embodiment, the expansion tank 1 is alsoprovided with a liquid level sensor 36 (see Fig 1) which ismounted to the casing 2 at a lower part thereof and configured togive off a signal when the coolant level in the expansion chamber
3 has reached a given lower level.
The casing 2 is provided with a marking 38 (see Fig 1) whichindicates the minimum coolant level in the expansion chamber 3and another marking 39 which indicates the maximum coolant
level in the expansion chamber 3.
A closable discharge opening (not shown) may be provided at thebottom of the settling basin 8 in order to make possible adischarge of particulate contaminants settled at the bottom of the
settling basin.
Fig 6
chamber 3. Coolant and accompanying air bubbles are led into
illustrates the flow of coolant through the expansion
the first inlet basin 7 from a first vent conduit via the first inletopening 6. From the first inlet basin 7 the coolant runs over tothe first guide member 16 via the upper edge 18 of the first inletbasin. By means of the first inlet basin 7 it is ensured that thecoolant will flow along the first guide member 16 in a well-distributed flow so that a thin layer of coolant is formed on thefirst guide member 16. From the lower end of the first guide
member 16 the coolant runs over the inlet edge 14 and down into
18
the settling basin 8. Particulate contaminants contained in thecoolant received in the settling basin 8 settle at the bottom of thesettling basin 8 under the effect of gravity. Coolant leaving thesettling basin 8 will run over the outlet edge 15 and down onto
the second guide member 22 via the flow passage 27.
Coolant and accompanying air bubbles are led into the secondinlet basin 21 from a second vent conduit via the second inletopening 20. From the second inlet basin 21 the coolant runs overto the second guide member 22 via the upper edge 25 of thesecond inlet basin 21. By means of the second inlet basin 21 it isensured that the coolant will flow over the upper end of thesecond guide member 22 in a well-distributed flow so that a thinlayer of coolant is formed on the upper end of the second guidemember 22. The coolant then runs down into the wave trough 26on the second guide member 22 and will thereafter pass over thetop of the crest 23 on the second guide member 22. By means ofthe wave trough 26 it is ensured that the coolant will flow overthe top of the crest 23 in a well-distributed flow so that a thinlayer of coolant is formed on the top of the crest 23. After havingpassed the top of the crest 23 the coolant flowing along thesecond guide member 22 will join the coolant which falls downonto the second guide member 22 from the flow passage 27. Thecombined coolant flow is then directed to the lower part 3a of theexpansion chamber 3 via the third guide member 28 and mixedwith the coolant accumulated in the lower part 3a of theexpansion chamber. Coolant leaves the expansion chamber 3 via
the outlet 4 at the bottom of the expansion chamber.
19
A cooling system 40 intended for a motor vehicle is schematicallyillustrated in Fig 7. This cooling system 40 comprises a coolingcircuit 41 for cooling a combustion engine 42 of the vehicle bymeans of a coolant flowing through the cooling circuit. Thecoolant is preferably in the form of water, with possible anti-freezing additives such as for instance glycol. A coolant pump 43is provided in the cooling circuit 41 in order to circulate thecoolant in the cooling circuit. Furthermore, a radiator 44, forinstance in the form of a conventional coolant radiator, isprovided in the cooling circuit 41 in order to cool the coolant.This radiator 44 has a coolant inlet 45a which is connected to acoolant outlet 46b of the combustion engine 42 via a first conduit47 of the cooling circuit, and a coolant outlet 45b which isconnected to a coolant inlet 46a of the combustion engine 42 viaa second conduit 48 of the cooling circuit. ln the illustratedexample, the coolant pump 43 is arranged in the second conduit48. The first conduit 47 is connected to the second conduit 48 viaa third conduit 49 of the cooling circuit. This third conduit 49 isconfigured to allow coolant to be returned from the coolant outlet46b of the combustion engine 42 back to the coolant inlet 46a ofthe combustion engine without passing through the radiator 44.Thus, the third conduit 49 constitutes a bypass conduit, via whichcoolant circulating in the cooling circuit 41 can bypass theradiator 44 on its way between the coolant outlet 46b and thecoolant inlet 46a of the combustion engine 42. Between thecoolant inlet 46a and the coolant outlet 46b of the combustionengine 42, the coolant is circulated through coolant ducts (notshown) inside the combustion engine while absorbing heat fromthe combustion engine. A thermostat 50 is provided at the
junction point between the first conduit 47 and the third conduit
49. Depending on the temperature of the coolant, the thermostat50 will either direct the coolant from the combustion engine 42 tothe radiator 44 in order to allow the coolant to be cooled thereinbefore being returned to the combustion engine 42, or direct thecoolant from the combustion engine 42 directly back to thecombustion engine via the third conduit 49 without passingthrough the radiator 44.
The coolant flowing through the radiator 44 is cooled by meansof air which is blown towards the radiator when the motor vehicleis in motion. The cooling system 40 may also comprise a fan (notshown) for generating an air flow through the radiator 44. Thisfan may be connected to the combustion engine 42 in order to be
driven by the combustion engine.
The cooling system 40 is provided with an expansion tank 1 ofthe type described above. The outlet opening 4 of the expansiontank 1 is connected to the above-mentioned second conduit 48via a fourth conduit 51 of the cooling circuit 41. This fourthconduü 51
located between the radiator 44 and the coolant pump 43. The
is connected to the second conduit 48 at a point
first inlet opening 6 of the expansion tank 1 is connected to theradiator 44 via a first vent conduit 52 in order to allow coolantand air to flow from the radiator 44 and into the upper part 3b ofthe expansion chamber 3 via this first vent conduit 52 and thefirst inlet opening 6 of the expansion tank 1. The second inletopening 20 is connected to cooling ducts in the combustionengine 42 via a second vent conduit 53 in order to allow coolantand air to flow from the combustion engine 42 and into the upper
part 3b of the expansion chamber 3 via this second vent conduit
21
53 and the second inlet opening 20 of the expansion tank 1. Thediameter of the first vent conduit 52 is preferably smaller than thediameter of the second vent conduit 53. The mass flow of coolantthrough the first vent conduit 52 is with advantage considerablylower than the mass flow of coolant through the second ventconduit 53, for instance 25-50%, preferably about one third, ofthe mass flow of coolant through the second vent conduit 53.Coolant is led into the expansion chamber 3 of the expansiontank 1 via the vent conduits 52, 53 and is returned from theexpansion chamber 3 to the cooling circuit 41 via the above-mentioned fourth conduit 51 after deaeration in the expansionchamber.
The expansion tank according to the invention is particularlyintended for use in a heavy motor vehicle, such as for instance a
bus, a tractor truck or a lorry.
The invention is of course not in any way restricted to the em-bodiments described above. On the contrary, many possibilitiesto modifications thereof will be apparent to a person with ordi-nary skill in the art without departing from the basic idea of the
invention such as defined in the appended claims.
Claims (14)
1-4, characterized in that a second inlet opening (20) is arranged tank according to any of claimsin the casing (2) and intended to be connected to a ventconduit of said cooling system in order to allow coolant andair to flow into the expansion chamber (3) via this second inletopening (20), wherein the expansion tank (1) is so configuredthat the coolant entering the expansion chamber (3) via thesecond inlet opening (20) is allowed to flow to said lower part(3a) of the expansion chamber without passing the first inletbasin (7) and the settling basin (8). An expansion tank according to claim 5, characterized in thatthe cross-sectional area of the first inlet opening (6) is smaller than the cross-sectional area of the second inlet opening (20). An expansion tank according to claim 5 or 6, characterized in: - that a second inlet basin (21) is arranged in said upper part(3b) of the expansion chamber (3), wherein this second inletbasin (21) is configured to receive the coolant which flowsinto the expansion chamber (3) via said second inlet opening(20); and - that a second guide member (22) is connected to the secondinlet basin (21), wherein coolant may flow from an upper partof the second inlet basin (21) and further on towards saidlower part of the expansion chamber (3) via this second guidemember (22). An expansion tank according to c|aim 7, characterized in thatthe second guide member (22) is undulated and has at least(23) thelongitudinal direction of the second guide member (22). one crest which extends perpendicularly to An expansion tank according to c|aim 7 or 8, characterized inthat the second guide member (22) is arranged below the settling basin (8). 10.An expansion tank according to c|aim 9, characterized in that 11 .An the settling basin (8) is connected to the second guidemember (22) by a flow passage (27), via which coolant mayflow from the outlet (10) of the settling basin (8) and fall downonto the second guide member (22). expansion tank according to any of claims 7-10,characterized in: - that a third guide member (28) is arranged in the expansionchamber (3) below the second guide member (22), whereinthis third guide member (28) slopes downwards from an upperend (28b) located in said upper part (3b) of the expansionchamber (3) to a lower end (28a) located in said lower part (3a) of the expansion chamber; and 26 - that the second guide member (22) is connected to the thirdguide member (28) by a flow passage (29), via which coolantmay flow from a lower end (22a) of the second guide member(22) and fall down onto the third guide member (28). 12.A cooling system for a motor vehicle comprising: - a cooling circuit (41) for cooling a combustion engine (42) ofthe motor vehicle by means of coolant circulating in thecooling circuit (41); and - a radiator (44) provided in the cooling circuit (41) for coolingthe coolant; characterized in that the cooling system (40) comprises anexpansion tank (3) according to any of claims 1-11, whereinthe first inlet opening (6) of the expansion tank (3) isconnected to a vent conduit (52) included in the cooling circuit(41) and the outlet opening (4) of the expansion tank (3) isconnected to a coolant conduit (51) included in the coolingcircuit (41). 13.A cooling system according to claim 12, characterized in that the expansion tank (3) is an expansion tank according to anyof claims 5-11, wherein the first inlet opening (6) of theexpansion tank (3) is connected to a first vent conduit (52)included in the cooling circuit (41) and the second inletopening (20) of the expansion tank (3) is connected to a second vent conduit (53) included in the cooling circuit (41). 14.A cooling system according to claim 13, characterized in that the diameter of said first vent conduit (52) is smaller than the diameter of said second vent conduit (53). 27 15.A cooling system according to claim 13 or 14, characterized m: - that said first vent conduit (52) is connected to the radiator(44) in order to allow coolant and air to flow from the radiator(44) and into said upper part (3b) of the expansion chamber(3) via this first vent conduit (52) and the first inlet opening(6) of the expansion tank (3); and - that said second vent conduit (53) is connected to thecombustion engine (42) in order to allow coolant and air toflow from the combustion engine (42) and into said upper part(3b) of the expansion chamber (3) via this second ventconduit (53) and the second inlet opening (20) of the expansion tank (3).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1451253A SE539416C2 (en) | 2014-10-21 | 2014-10-21 | Expansion tank and cooling system including such an expansion tank |
| EP15190338.2A EP3012429B1 (en) | 2014-10-21 | 2015-10-19 | Expansion tank and cooling system comprising such an expansion tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1451253A SE539416C2 (en) | 2014-10-21 | 2014-10-21 | Expansion tank and cooling system including such an expansion tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1451253A1 true SE1451253A1 (en) | 2016-04-22 |
| SE539416C2 SE539416C2 (en) | 2017-09-19 |
Family
ID=54337146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1451253A SE539416C2 (en) | 2014-10-21 | 2014-10-21 | Expansion tank and cooling system including such an expansion tank |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3012429B1 (en) |
| SE (1) | SE539416C2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019132130A (en) * | 2016-06-02 | 2019-08-08 | 日立建機株式会社 | Expansion tank |
| DE102017120056A1 (en) * | 2017-08-31 | 2019-02-28 | Volkswagen Aktiengesellschaft | Expansion tank for a cooling system of a vehicle and vehicle with such a reservoir |
| KR20230040950A (en) * | 2020-06-05 | 2023-03-23 | 쩌지앙 리안콩 테크놀로지스 컴퍼니.,리미티드. | Expansion tanks, vehicle cooling systems and vehicles |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6124659Y2 (en) * | 1980-07-15 | 1986-07-24 | ||
| DE10041121B4 (en) * | 2000-08-22 | 2015-01-08 | Behr Gmbh & Co. Kg | Heat exchanger with several heat transfer circuits |
| GB0318402D0 (en) * | 2003-08-06 | 2003-09-10 | Ford Global Tech Llc | Cooling system expansion tank |
| US7383795B2 (en) * | 2006-03-16 | 2008-06-10 | Daimler Trucks North America Llc | Surge tank |
| JP4600537B2 (en) * | 2008-07-10 | 2010-12-15 | トヨタ自動車株式会社 | Reserve tank |
| CN201916040U (en) * | 2010-11-25 | 2011-08-03 | 集瑞联合重工有限公司 | Expansion tank used for heavy-duty truck |
-
2014
- 2014-10-21 SE SE1451253A patent/SE539416C2/en unknown
-
2015
- 2015-10-19 EP EP15190338.2A patent/EP3012429B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3012429A1 (en) | 2016-04-27 |
| SE539416C2 (en) | 2017-09-19 |
| EP3012429B1 (en) | 2019-07-17 |
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