EP1960646A1 - A cooling system - Google Patents

A cooling system

Info

Publication number
EP1960646A1
EP1960646A1 EP06824472A EP06824472A EP1960646A1 EP 1960646 A1 EP1960646 A1 EP 1960646A1 EP 06824472 A EP06824472 A EP 06824472A EP 06824472 A EP06824472 A EP 06824472A EP 1960646 A1 EP1960646 A1 EP 1960646A1
Authority
EP
European Patent Office
Prior art keywords
coolant
engine
cooling system
deaeration
expansion vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06824472A
Other languages
German (de)
French (fr)
Inventor
Erik Dahl
Peter Nilsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Truck Corp
Original Assignee
Volvo Lastvagnar AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Lastvagnar AB filed Critical Volvo Lastvagnar AB
Publication of EP1960646A1 publication Critical patent/EP1960646A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01P11/028—Deaeration devices

Definitions

  • the present invention relates to a cooling system for an engine.
  • the system comprises a main radiator, at least one coolant pump, an expansion vessel, and at least one
  • deaeration conduit connecting at least one high point of the cooling system and the expansion vessel.
  • the higher coolant temperature is however not only
  • a side effect of the higher coolant temperature is that the life of the expansion vessel is significantly reduced.
  • One way of improving the life is to manufacture the expansion vessel of a more temperature durable
  • the present invention solves the abovementioned problems by providing at least one secondary heat exchanger for cooling coolant flowing through said at least one deaeration conduit .
  • the at least one secondary heat exchanger is an elongate pipe or hose placed in a stream of air. This embodiment is advantageous in that it is uncomplicated and inexpensive.
  • elongate pipe or hose is provided with area increasing means. This allows for a shorter pipe or hose.
  • the secondary heat exchanger is a coolant/coolant heat exchanger exchanging heat between a cold coolant and the coolant flowing through said at least one deaeration conduit.
  • This embodiment could be useful if the vehicle is equipped with separate cooling circuits for engine and appliances, e.g. gearbox and/or charge cooler.
  • Fig. 1 is a schematic view of a first embodiment of the present invention
  • Fig. 2 is a schematic view of a second embodiment of the present invention.
  • Fig. 1 shows a cooling system 100 according to the present invention, wherein the cooling system 100 is intended to cool an engine 150.
  • the cooling system 100 comprises a main radiator 110, a bypass 115, a coolant pump 120, an
  • expansion tank 130 provided with a filler cap 131, inlets 137, 138 and an outlet 139 situated at a bottom part of the expansion tank, a thermostat 140 and secondary heat
  • the outlet 139 is connected to a point downstream the radiator 110 and upstream the coolant pump 120 by a conduit 180 (for definition of upstream and downstream, see next paragraph) .
  • the cooling system 100 includes first and second drain cocks 160, 161 located at bottom portions of the main radiator 110 and an engine 150 to be cooled, respectively.
  • the cooling system is connected to a gearbox cooler 170 and/or a brake compressor 175, i.e. the compressor for supplying the braking system of the vehicle with compressed air.
  • a hosing and/or piping system which in Fig. 1 are shown as full lines provided with small arrows indicating a flow direction of a coolant flowing between the above mentioned components . Consequently, a side of a component facing a tip of a small arrow is an upstream side of the component, and a side of a component facing a base of the small arrow is a downstream side of said component.
  • the hosing and/or piping system is only given reference numerals when a portion of the system is directly referred to, since the basic function of such a system is well known by persons skilled in the art.
  • Two deaeration conduits 137', 138' connect high points in the cooling system 100 on the engine 150 and on the main radiator 110 to the inlets 137, 138 of the expansion vessel, via the secondary heat exchangers 145, 145' , respectively.
  • the purpose of the cooling system is mainly to cool the engine by transferring heat from the engine 150 to the main radiator 110.
  • the coolant pump 120 provides the flow of coolant, the
  • the coolant absorbs heat, which increases the temperature of the coolant.
  • the coolant passes the thermostat 140; if the coolant temperature is above a threshold value, e.g. 110 degrees centigrade, the thermostat directs the flow of coolant to the main radiator 110, where the hot coolant exchanges heat with ambient air. The heat exchange with the air results in a temperature drop of the coolant.
  • the radiator the cold coolant is again fed to the coolant pump 120, from which it again enters the engine's coolant circuits CC.
  • the coolant is directed by the thermostat 140 to the bypass 115, in order to let the coolant bypass the main radiator 110. Hence, the coolant experiences no significant temperature drop, which helps the coolant, and hence the engine, to reach an appropriate working temperature more rapidly. If the temperature is close to the threshold value, the thermostat might direct part of the coolant flow through the radiator, and allow the other part of the coolant flow to bypass the main radiator.
  • the two deaerating conduits 137 ' , 138' are connecting a point close to the thermostat 140 and a point on the top area of the main radiator 110 to the inlets 137 and 138 of the expansion vessel 130, respectively.
  • coolant will be forced to flow through the conduits 137', 138' to the expansion vessel 130 due to the coolant pressure drop over the main radiator 110 or the bypass 115.
  • the coolant entering the expansion vessel will eventually re-enter the cooling flow scheme coolant pump 120 - engine 150 - thermostat 140 - main radiator 110. This re-entering takes place by the conduit 180 connecting the expansion vessel outlet 139 to a point downstream the main radiator 110 and upstream the coolant pump 120. Since the thermostat 140 and the main radiator 110
  • the coolant flowing through the deaerating conduits may contain some gas, which e.g. might emanate from small leaks or simply from diffusion of combustion gas through the cast iron from which the engine is manufactured.
  • the possible gas mixed in the coolant from the engine 150 and the main radiator 110 will raise towards the coolant surface, hence leaving a virtually gas free coolant to re-enter the cooling circuits CC of the engine 150.
  • the coolant temperature is decreased by the provision of the secondary heat exchangers 145, 145', which as mentioned are placed in the deaeration conduits 137' , 138' .
  • the secondary heat exchangers 145 and 145' are simply elongate pipes of a heat conducting material, e.g. any kind of metal, e.g. iron, steel, copper, aluminium, stainless steel or any other suitable metal.
  • the pipes are placed in a stream of cold air, e.g. in front of the main radiator 110.
  • these pipes are provided with area increasing means, e.g. circumferentially extending wings .
  • the secondary heat exchangers might be coolant/coolant heat exchangers.
  • This might be an advantageous solution if two separate cooling systems are used, e.g. one high temperature cooling system for cooling the engine and one low temperature cooling system for gearbox cooling. Separate cooling systems could also be used as a means for allowing a coolant/air heat exchanger as a charge cooler for engine intake air, compressed in the turbocharger, in a way that is well known by persons skilled in the art.
  • the invention has been described with two separate secondary heat exchangers 145, 145'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A cooling system (100) for an engine (150) , comprising at least one coolant pump (120) for pumping a coolant through the engine (150) and a thermostat (140) operable to selectively direct said coolant from said engine (150) via a bypass (115) back to said engine (150) or via a main radiator (110) back to said engine (150) in response to a temperature of said coolant from said engine (150) , and an expansion vessel (130) for deaerating said cooling system (100) . The system (100) includes a first deaeration conduit (13V) connecting a high point of said engine (150) to said expansion vessel (130) , and a second deaeration conduit (138') connecting a high point of said main radiator (110) to said expansion vessel, and said first and second deaeration conduits (137' , 138' ) are provided with at least one heat exchanger (145, 145') for cooling coolant flowing through said deaeration conduits (137' , 138' ) .

Description

TITLE OF THE INVENTION: A COOLING SYSTEM
FIELD OF THE INVENTION
The present invention relates to a cooling system for an engine. The system comprises a main radiator, at least one coolant pump, an expansion vessel, and at least one
deaeration conduit connecting at least one high point of the cooling system and the expansion vessel.
PRIOR ART
Today, most cooling systems for engines in trucks, heavy duty trucks, tractors, passenger cars, marine engines, excavators etc. are equipped with so called deaeration systems, i.e. a (small diameter) hose or pipe leading from a high point of the cooling system to the expansion vessel. As is well known by persons skilled in the art, gas tends to cumulate in high points in cooling systems, and by providing a hose or pipe leading from a high point to the expansion vessel, cumulated gas will enter the expansion vessel, where the gas can be separated from coolant by the force of gravity.
For a number of reasons , it is more or less industry standard to use expansion vessels made from transparent plastic material; a transparent material gives a
possibility to monitor both the coolant level and the condition of the coolant by noticing colour changes. In the automotive industry, there is an ongoing trend towards ever higher coolant temperatures . Higher coolant temperatures mean a lot of advantages; for example, the main radiator can be significantly smaller, still
maintaining a cooling rate which is high enough. The higher coolant temperature is however not only
beneficial; a side effect of the higher coolant temperature is that the life of the expansion vessel is significantly reduced. One way of improving the life is to manufacture the expansion vessel of a more temperature durable
material, but this has proven to be expensive.
SUMMARY OF THE INVENTION
The present invention solves the abovementioned problems by providing at least one secondary heat exchanger for cooling coolant flowing through said at least one deaeration conduit .
In a preferred embodiment of the invention, the at least one secondary heat exchanger is an elongate pipe or hose placed in a stream of air. This embodiment is advantageous in that it is uncomplicated and inexpensive.
The first embodiment can be further improved if the
elongate pipe or hose is provided with area increasing means. This allows for a shorter pipe or hose.
In another embodiment, the secondary heat exchanger is a coolant/coolant heat exchanger exchanging heat between a cold coolant and the coolant flowing through said at least one deaeration conduit. This embodiment could be useful if the vehicle is equipped with separate cooling circuits for engine and appliances, e.g. gearbox and/or charge cooler. BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described with reference to the appended drawings, wherein:
Fig. 1 is a schematic view of a first embodiment of the present invention, and Fig. 2 is a schematic view of a second embodiment of the present invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
Fig. 1 shows a cooling system 100 according to the present invention, wherein the cooling system 100 is intended to cool an engine 150. The cooling system 100 comprises a main radiator 110, a bypass 115, a coolant pump 120, an
expansion tank 130 provided with a filler cap 131, inlets 137, 138 and an outlet 139 situated at a bottom part of the expansion tank, a thermostat 140 and secondary heat
exchangers 145, 145' . The outlet 139 is connected to a point downstream the radiator 110 and upstream the coolant pump 120 by a conduit 180 (for definition of upstream and downstream, see next paragraph) . Moreover, the cooling system 100 includes first and second drain cocks 160, 161 located at bottom portions of the main radiator 110 and an engine 150 to be cooled, respectively. In some embodiments, the cooling system is connected to a gearbox cooler 170 and/or a brake compressor 175, i.e. the compressor for supplying the braking system of the vehicle with compressed air.
As is well known by persons skilled in the art, the above mentioned components are interconnected by a hosing and/or piping system, which in Fig. 1 are shown as full lines provided with small arrows indicating a flow direction of a coolant flowing between the above mentioned components . Consequently, a side of a component facing a tip of a small arrow is an upstream side of the component, and a side of a component facing a base of the small arrow is a downstream side of said component. The hosing and/or piping system is only given reference numerals when a portion of the system is directly referred to, since the basic function of such a system is well known by persons skilled in the art. Two deaeration conduits 137', 138' connect high points in the cooling system 100 on the engine 150 and on the main radiator 110 to the inlets 137, 138 of the expansion vessel, via the secondary heat exchangers 145, 145' , respectively.
Hereinafter, the function of the cooling system 100 will be described with reference to Fig. 1. The purpose of the cooling system is mainly to cool the engine by transferring heat from the engine 150 to the main radiator 110. The coolant pump 120 provides the flow of coolant, the
direction of which, as mentioned earlier, being indicated by small arrowheads on the conduits connecting various components, into internal cooling circuits CC in the engine 150, where the coolant absorbs heat, which increases the temperature of the coolant. After having collected the heat in the engine, the coolant passes the thermostat 140; if the coolant temperature is above a threshold value, e.g. 110 degrees centigrade, the thermostat directs the flow of coolant to the main radiator 110, where the hot coolant exchanges heat with ambient air. The heat exchange with the air results in a temperature drop of the coolant. After the radiator, the cold coolant is again fed to the coolant pump 120, from which it again enters the engine's coolant circuits CC.
If the temperature of the coolant after having passed the engine's coolant circuits is lower than the threshold value, the coolant is directed by the thermostat 140 to the bypass 115, in order to let the coolant bypass the main radiator 110. Hence, the coolant experiences no significant temperature drop, which helps the coolant, and hence the engine, to reach an appropriate working temperature more rapidly. If the temperature is close to the threshold value, the thermostat might direct part of the coolant flow through the radiator, and allow the other part of the coolant flow to bypass the main radiator. In order to deaerate the coolant, the two deaerating conduits 137 ' , 138' are connecting a point close to the thermostat 140 and a point on the top area of the main radiator 110 to the inlets 137 and 138 of the expansion vessel 130, respectively. During operation, coolant will be forced to flow through the conduits 137', 138' to the expansion vessel 130 due to the coolant pressure drop over the main radiator 110 or the bypass 115. The coolant entering the expansion vessel will eventually re-enter the cooling flow scheme coolant pump 120 - engine 150 - thermostat 140 - main radiator 110. This re-entering takes place by the conduit 180 connecting the expansion vessel outlet 139 to a point downstream the main radiator 110 and upstream the coolant pump 120. Since the thermostat 140 and the main radiator 110
represent two high points in the cooling system, the coolant flowing through the deaerating conduits may contain some gas, which e.g. might emanate from small leaks or simply from diffusion of combustion gas through the cast iron from which the engine is manufactured.
In the expansion vessel 130, which compared to the conduits 137' and 138' represents a large volume, the possible gas mixed in the coolant from the engine 150 and the main radiator 110 will raise towards the coolant surface, hence leaving a virtually gas free coolant to re-enter the cooling circuits CC of the engine 150.
According to the invention, the coolant temperature is decreased by the provision of the secondary heat exchangers 145, 145', which as mentioned are placed in the deaeration conduits 137' , 138' .
According to a first embodiment of the invention, the secondary heat exchangers 145 and 145' are simply elongate pipes of a heat conducting material, e.g. any kind of metal, e.g. iron, steel, copper, aluminium, stainless steel or any other suitable metal. In one embodiment, the pipes are placed in a stream of cold air, e.g. in front of the main radiator 110. In another embodiment of the invention, these pipes are provided with area increasing means, e.g. circumferentially extending wings .
In still another embodiment, the secondary heat exchangers might be coolant/coolant heat exchangers. This might be an advantageous solution if two separate cooling systems are used, e.g. one high temperature cooling system for cooling the engine and one low temperature cooling system for gearbox cooling. Separate cooling systems could also be used as a means for allowing a coolant/air heat exchanger as a charge cooler for engine intake air, compressed in the turbocharger, in a way that is well known by persons skilled in the art. Furthermore, the invention has been described with two separate secondary heat exchangers 145, 145'. In another embodiment, it might be advantageous to omit one of such heat exchangers 145, 145', or, such as shown in Fig. 2, to combine them into a single heat exchanger 200 cooling coolant emanating from either the top of the radiator or the top of the engine, or both.
As can be seen, most reference numerals have been omitted in Fig. 2, for the sake of simplicity. It is however obvious that all non-referenced components shown in Fig. 2 are identical to those shown in Fig. 1.

Claims

1. A cooling system (100) for an engine (150), said system (100) comprising at least one coolant pump (120) operable to pump a coolant through the engine (150) , a thermostat (140) operable to selectively direct said coolant from said engine
(150) via a bypass (115) back to said engine (150) or via a main radiator (110) back to said engine (150) in response to a temperature of said coolant from said engine (150) , and an expansion vessel (130) for deaerating said cooling system (100)
characterized in that
said cooling system (100) includes at least a first deaeration conduit (13V ) connecting a high point of said engine (150) to said expansion vessel (130), and a second deaeration conduit (138') connecting a high point of said main radiator (110) to said expansion vessel, and
said first and second deaeration conduits (13V , 138' ) are provided with at least one heat exchanger (145, 145') for cooling coolant flowing through said deaeration conduits (13V , 138') .
2. A cooling system (100) as claimed in claim 1, wherein the at least one secondary heat exchanger (145, 145' ) is an elongate pipe or hose placed in operation in a stream of air.
3. A cooling system (100) as claimed in claim 2, wherein the elongate pipe or hose is provided with area increasing means .
4. A cooling system (100) as claimed in claim 1, wherein the secondary heat exchanger (145, 145') is a coolant/coolant heat exchanger exchanging heat between a second coolant and the coolant flowing through said deaerating conduits .
EP06824472A 2005-12-05 2006-11-24 A cooling system Withdrawn EP1960646A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0502676A SE529541C2 (en) 2005-12-05 2005-12-05 Cooling
PCT/SE2006/001332 WO2007067118A1 (en) 2005-12-05 2006-11-24 A cooling system

Publications (1)

Publication Number Publication Date
EP1960646A1 true EP1960646A1 (en) 2008-08-27

Family

ID=38123157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06824472A Withdrawn EP1960646A1 (en) 2005-12-05 2006-11-24 A cooling system

Country Status (6)

Country Link
US (1) US20090250019A1 (en)
EP (1) EP1960646A1 (en)
CN (1) CN101321938B (en)
BR (1) BRPI0619426A2 (en)
SE (1) SE529541C2 (en)
WO (1) WO2007067118A1 (en)

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CN102042073A (en) * 2011-01-28 2011-05-04 东风朝阳柴油机有限责任公司 Engine cooling water system device with automatic exhaust function
US9121335B2 (en) * 2011-05-13 2015-09-01 Ford Global Technologies, Llc System and method for an engine comprising a liquid cooling system and oil supply
CN102337956A (en) * 2011-08-30 2012-02-01 奇瑞汽车股份有限公司 Dual-water chamber radiator structure
DE112013003619T5 (en) * 2012-08-20 2015-04-23 Borgwarner Inc. Heat cold start system with multifunction valve
US20160059672A1 (en) * 2014-08-26 2016-03-03 CNH Industrial America, LLC Cooling system for a work vehicle
US10378429B2 (en) * 2015-10-28 2019-08-13 Hyundai Motor Company Hybrid intercooler system and control method thereof
DE112018000019B4 (en) * 2018-03-28 2022-07-14 Komatsu Ltd. Engine cooling device with valves for switching circulation routes for a coolant depending on the temperature of the coolant
CA3153805A1 (en) * 2020-05-18 2021-11-25 Richard John Donahue System and method for extending oil life in an engine
CN112459889A (en) * 2020-11-25 2021-03-09 东风汽车集团有限公司 Engine cooling system and control method thereof

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Also Published As

Publication number Publication date
WO2007067118A1 (en) 2007-06-14
CN101321938A (en) 2008-12-10
SE529541C2 (en) 2007-09-11
US20090250019A1 (en) 2009-10-08
BRPI0619426A2 (en) 2011-10-04
SE0502676L (en) 2007-06-06
CN101321938B (en) 2010-12-15

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