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JPH01294946A - Waste heat utilizing device for engine - Google Patents

Waste heat utilizing device for engine

Info

Publication number
JPH01294946A
JPH01294946A JP63124366A JP12436688A JPH01294946A JP H01294946 A JPH01294946 A JP H01294946A JP 63124366 A JP63124366 A JP 63124366A JP 12436688 A JP12436688 A JP 12436688A JP H01294946 A JPH01294946 A JP H01294946A
Authority
JP
Japan
Prior art keywords
engine
water
stirling
stirling engine
cooling water
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.)
Pending
Application number
JP63124366A
Other languages
Japanese (ja)
Inventor
Masaaki Michizoe
道添　正章
Mitsuo Kaino
会野　光雄
Shigeo Aoki
青木　繁夫
Toshio Sasajima
笹島　敏雄
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP63124366A priority Critical patent/JPH01294946A/en
Publication of JPH01294946A publication Critical patent/JPH01294946A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • F02G5/04—Profiting from waste heat of exhaust gases in combination with other waste heat from combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2243/00—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes
    • F02G2243/02—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes having pistons and displacers in the same cylinder
    • F02G2243/04—Crank-connecting-rod drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2260/00—Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

PURPOSE:To enable large auxiliary power to be generated with two-step pressurization of pressure fluid serving as the auxiliary power by driving each individual Stirling engine by exhaust gas and cooling water of a water-cooled engine and compressors respectively by power of these Stirling engines. CONSTITUTION:An exhaust pipe 6, derived from a water-cooled Diesel engine 1 for driving a work device, is arranged so as to pass through via a heating pipe 7 in one (2) of the two Stirling engines 2, 3, and utilizing a quantity of heat of exhaust gas, the Stirling engine 2 is driven. While a cooling water return pipe (hot water pipe) 8, derived from the water-cooled engine 1, is connected communicating with a heating part 9 of the other Stirling engine 3, and utilizing a quantity of heat of cooling water, the Stirling engine is driven. And by compressors 4, 5 connected to output shafts 10, 11 of each Stirling engine 2, 3, pressure fluid, serving as the auxiliary power, is pressurized over two steps.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、エンジン発電機等のエンジン作業機で作業装
置を駆動しているエンジンの廃棄熱エネルギーを利用し
てコンプレッサーやポンプ等の圧縮機を駆動する廃熱利
用装置に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention utilizes the waste thermal energy of an engine that drives a working device with an engine generator such as a compressor or pump. This invention relates to a waste heat utilization device that drives a.

（従来技術） 一般にエンジンにおける燃焼熱エネルギーの有効利用率
は３０〜４５％程度で、６０％前後の熱エネルギーが排
気ガスやエンジン冷却水として外部に廃棄されている。(Prior Art) Generally, the effective utilization rate of combustion heat energy in an engine is about 30 to 45%, and about 60% of the heat energy is discarded to the outside as exhaust gas or engine cooling water.

そして従来、エンジン廃熱を利用するものにあっては、
このエンジン冷却水や排気ガスの保有熱エネルギーを熱
交換して、温水や温風として利用している。Conventionally, for those that utilize engine waste heat,
The thermal energy retained in the engine cooling water and exhaust gas is exchanged and used as hot water or hot air.

（解決しようとする課題） 従来のエンジンを廃熱利用するものでは、熱エネルギー
を温風や温水の形で熱として取り出して利用しているだ
けであるから、熱エネルギーを直接的に利用するにとど
まっていた。(Problem to be solved) Conventional engines that utilize waste heat only extract and use thermal energy in the form of hot air or hot water, so it is difficult to directly utilize thermal energy. It stayed.

本発明は、エンジンから廃棄される熱エネルギーを他の
エネルギーの形で利用することのできるエンジン廃熱利
用装置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide an engine waste heat utilization device that can utilize thermal energy discarded from an engine in the form of other energy.

（課題を解決するための手段） 上記目的を達成するために本発明では、エンジン廃熱利
用装置を、作業装置駆動用の水冷式エンジンと２つのス
ターリングエンジン及び各スターリングエンジンでそれ
ぞれ駆動される圧縮機とで構成し、水冷式エンジンの排
気ガスを一方のスターリングエンジンの加熱部に供給す
るとともに、水冷式エンジンからの高温冷却水を他方の
スターリングエンジンの加熱部に供給し、冷却水温を熱
源としているスターリングエンジンで駆動されている圧
縮機の吐出口を、排気ガス温を熱源としているスターリ
ングエンジンで駆動されている圧縮機の吸入口に連結し
たことを特徴としている。(Means for Solving the Problems) In order to achieve the above object, the present invention provides an engine waste heat utilization device including a water-cooled engine for driving working equipment, two Stirling engines, and a compressor driven by each Stirling engine. The exhaust gas from the water-cooled engine is supplied to the heating section of one Stirling engine, and the high-temperature cooling water from the water-cooled engine is supplied to the heating section of the other Stirling engine, using the cooling water temperature as a heat source. The discharge port of the compressor, which is driven by a Stirling engine, is connected to the suction port of a compressor, which is driven by a Stirling engine, which uses exhaust gas temperature as a heat source.

（作　　用） 本発明では、エンジン廃熱利用装置を、作業装置駆動用
の水冷式エンジンと２つのスターリングエンジン及び各
スターリングエンジンでそれぞれ駆動される圧縮機とで
構成し、水冷式エンジンの排気ガスを一方のスターリン
グエンジンの加熱部に供給するとともに、水冷式エンジ
ンからのａ！冷却水を他方のスターリングエンジンの加
熱Ｈに供給しているので、エンジン作業機の補助作業と
してエンジンからの廃棄熱エネルギーを利用して流体を
圧送することができる。(Function) In the present invention, the engine waste heat utilization device is composed of a water-cooled engine for driving working equipment, two Stirling engines, and a compressor driven by each Stirling engine. is supplied to the heating section of one Stirling engine, and the a! from the water-cooled engine is supplied to the heating section of one Stirling engine. Since cooling water is supplied to the heating H of the other Stirling engine, fluid can be pumped using waste thermal energy from the engine as an auxiliary work of the engine working machine.

さらに、冷却水温を熱源としているスターリングエンジ
ンで駆動されている圧縮機の吐出口を、排気ガス温を熱
源としているスターリングエンジンで駆動されている圧
縮機の吸入口に連結しているので、冷却水と排気ガスと
の温度差を利用して負荷の異なるスターリングエンジン
をそれぞれ駆動して、被圧縮体を二段加圧することにな
る。Furthermore, the discharge port of the compressor, which is driven by a Stirling engine that uses cooling water temperature as its heat source, is connected to the inlet of the compressor that is driven by a Stirling engine, which uses exhaust gas temperature as its heat source. Using the temperature difference between the engine and the exhaust gas, Stirling engines with different loads are driven to pressurize the compressed body in two stages.

（実施例） 図面は本発明の一実施例を示す概略系統図である。(Example) The drawing is a schematic system diagram showing one embodiment of the present invention.

このエンジン廃熱利用装置は、作業装置駆動用の水冷式
ディーゼルエンジン（１）と、２つのスターリングエン
ジン（２）（３）、及びスターリングエンジン（２）（
３）で各々駆動されるコンプレッサー（４）（５）で構
成されている。This engine waste heat utilization device consists of a water-cooled diesel engine (1) for driving working equipment, two Stirling engines (2) (3), and a Stirling engine (2) (
It consists of compressors (4) and (5), each driven by a compressor (4) and (5).

水冷式エンジン（１）から導出した排気管（６）は、一
方のスターリングエンジン（２）の加熱部（７）を経由
するように配管してあり、排気ガスが保有している熱エ
ネルギーを熱源として、このスターリングエンジン（２
）を駆動するようにしである。また、水冷式エンジン（
１）から導出した冷却水戻り管（温水管）（８）は、他
方のスターリングエンジン（３）の加熱部（９）に連通
連結してあり、冷却水の保有している熱エネルギーを熱
源としてこのスターリングエンジン（３）を駆動するよ
うに構成しである。The exhaust pipe (6) led out from the water-cooled engine (1) is piped to pass through the heating section (7) of one Stirling engine (2), and uses the thermal energy held by the exhaust gas as a heat source. As, this Stirling engine (2
). In addition, a water-cooled engine (
The cooling water return pipe (hot water pipe) (8) led out from 1) is connected to the heating section (9) of the other Stirling engine (3), and uses the thermal energy possessed by the cooling water as a heat source. It is configured to drive this Stirling engine (3).

このように構成すると、排気ガスの保有熱量は冷却水の
保有熱量よりも遥かに大きいことから、排気ガスの熱量
できる駆動されているスターリングエンジン（２）は冷
却水の熱量で駆動されているスターリングエンジン（３
）よりもその高負荷状態で運転することが可能となる。With this configuration, the heat capacity of the exhaust gas is much larger than the heat capacity of the cooling water, so the Stirling engine (2) that is driven by the heat capacity of the exhaust gas is replaced by the Stirling engine (2) that is driven by the heat capacity of the coolant. Engine (3
), it is possible to operate under higher load conditions.

このため、各スターリングエンジン（２）（３）の出力
軸（１０）（１１）に各々連動連結されているはコンプ
レッサー（４）（５）のうち、冷却水保有熱を熱源とし
ているスターリングエンジン（３）で駆動される第１コ
ンプレ、サー（５）の吐出口（１２）を、排気ガス保有
熱を熱源としているスターリングエンジン（２）で駆動
される第２コンプレツサー（４）の吸入口（１３）に接
続して、第１コンプレツサー（５）で圧縮された流体を
第２コンプレツサー（４）でさらに圧縮できるように構
成しである。For this reason, among the compressors (4) and (5) that are interlocked and connected to the output shafts (10) and (11) of each Stirling engine (2) and (3), the Stirling engine (which uses the heat retained in the cooling water as a heat source) The discharge port (12) of the first compressor (5), which is driven by ) so that the fluid compressed by the first compressor (5) can be further compressed by the second compressor (4).

なお、冷却水で加熱されるスターリングエンジン（３）
の加熱部（９）に供給された冷却水は、排気ガスで加熱
されるスターリングエンジン（２）の加熱部（７）を介
して水冷エンジン（１）のウォータジャケット（図示路
）に返送されるように構成してあり、この水冷エンジン
のウォータジャケットに戻される冷却水で、スターリン
グエンジン（２）の加熱部（７）を保温するようにしで
ある。In addition, Stirling engine heated with cooling water (3)
The cooling water supplied to the heating section (9) of is returned to the water jacket (path shown) of the water-cooled engine (1) via the heating section (7) of the Stirling engine (2), which is heated by exhaust gas. The heating section (7) of the Stirling engine (2) is kept warm by the cooling water returned to the water jacket of the water-cooled engine.

上記実施例では、一方のスターリングエンジン（３）を
加熱した後の冷却水を、他方のスターリングエンジン（
２）の加熱部（７）を介して水冷エンジン（１）に返送
するように構成したが、一方のスタ−リングエンジン（
３）の加熱部（９）から直接水冷エンジン（１）のウォ
ータジャケットに戻すようにしてもよい。In the above embodiment, the cooling water after heating one Stirling engine (3) is transferred to the other Stirling engine (3).
The water is returned to the water-cooled engine (1) via the heating section (7) of the Stirling engine (2).
The heating part (9) of 3) may be directly returned to the water jacket of the water-cooled engine (1).

（効　　果） 本発明では、エンジン廃熱利用装置を、作業装置駆動用
の水冷式エンジンと２つのスターリングエンジン及び各
スターリングエンジンでそれぞれ駆動される圧縮機とで
構成し、水冷式エンジンのｔ−＋を気ガスを一方のスタ
ーリングエンジンの加熱部に供給するとともに、水冷式
エンジンからの高を急冷却水を他方のスターリングエン
ジンの加熱部に供給しているので、エンジンからの廃棄
熱を有効に利用して、エンジン作業機の補助動力として
圧力流体を得ることができる。(Effects) In the present invention, the engine waste heat utilization device is composed of a water-cooled engine for driving working equipment, two Stirling engines, and a compressor driven by each Stirling engine, and the water-cooled engine's t- In addition to supplying air gas to the heating section of one Stirling engine, rapid cooling water from the water-cooled engine is also supplied to the heating section of the other Stirling engine, making the waste heat from the engine effective. This can be used to obtain pressurized fluid as auxiliary power for engine working machines.

さらに、冷却水温を熱源としているスターリングエンジ
ンで駆動されている圧縮機の吐出口を、排気ガス温を熱
源としているスターリングエンジンで駆動されている圧
縮機の吸入口に連結しているので、冷却水と排気ガスと
の温度差を利用して負荷の異なるスターリングエンジン
をそれぞれ駆動して、被圧縮体を二段加圧することにな
り、高圧の流体をえることができるから、大きな補助動
力を取り出すことができる。Furthermore, the discharge port of the compressor, which is driven by a Stirling engine that uses cooling water temperature as its heat source, is connected to the inlet of the compressor that is driven by a Stirling engine, which uses exhaust gas temperature as its heat source. By using the temperature difference between the engine and the exhaust gas to drive Stirling engines with different loads, the compressed body is pressurized in two stages, and high-pressure fluid can be obtained, so a large amount of auxiliary power can be extracted. I can do it.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の一実施例を示す概略系統図である。 ｌ・・・水冷式エンジン、２・３・・・スターリングエ
ンジン、４・５・・・圧縮機。The drawing is a schematic system diagram showing one embodiment of the present invention. 1... Water-cooled engine, 2.3... Stirling engine, 4.5... Compressor.

Claims (1)

【特許請求の範囲】[Claims] １、作業装置駆動用の水冷式エンジン（１）と２つのス
ターリングエンジン（２）（３）及び各スターリングエ
ンジン（２）（３）でそれぞれ駆動される圧縮機（４）
（５）とからなり、水冷式エンジン（１）の排気ガスを
一方のスターリングエンジン（２）の加熱部に供給する
とともに、水冷式エンジン（１）からの高温冷却水を他
方のスターリングエンジン（３）の加熱部に供給し、冷
却水温を熱源としているスターリングエンジン（３）で
駆動されている圧縮機（５）の吐出口を、排気ガス温を
熱源としているスターリングエンジン（２）で駆動され
ている圧縮機（４）の吸入口に連結したことを特徴とす
るエンジンの廃熱利用装置1. A water-cooled engine (1) for driving working equipment, two Stirling engines (2) (3), and a compressor (4) driven by each Stirling engine (2) (3).
(5), which supplies exhaust gas from the water-cooled engine (1) to the heating section of one Stirling engine (2), and supplies high-temperature cooling water from the water-cooled engine (1) to the other Stirling engine (3). ) and is driven by a Stirling engine (3) that uses the cooling water temperature as a heat source. An engine waste heat utilization device characterized by being connected to an inlet of a compressor (4).
JP63124366A 1988-05-20 1988-05-20 Waste heat utilizing device for engine Pending JPH01294946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63124366A JPH01294946A (en) 1988-05-20 1988-05-20 Waste heat utilizing device for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63124366A JPH01294946A (en) 1988-05-20 1988-05-20 Waste heat utilizing device for engine

Publications (1)

Publication Number Publication Date
JPH01294946A true JPH01294946A (en) 1989-11-28

Family

ID=14883622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63124366A Pending JPH01294946A (en) 1988-05-20 1988-05-20 Waste heat utilizing device for engine

Country Status (1)

Country Link
JP (1) JPH01294946A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340872A1 (en) * 1993-12-01 1994-06-16 Heinz Dr Ing Mueller Engine unit for motor vehicles, generators, etc - with exhaust and heat losses of IC engine used in Stirling motor
EP1624176A1 (en) * 2003-05-13 2006-02-08 HONDA MOTOR CO., Ltd. Multi-stage stirling engine
CN100370128C (en) * 2003-05-13 2008-02-20 本田技研工业株式会社 Multi-stage stirling engine
GB2442006A (en) * 2006-09-21 2008-03-26 Ray Mason Waste heat driven Stirling engine
WO2008035108A1 (en) * 2006-09-21 2008-03-27 Ray Mason Engine assemblies
FR2917129A1 (en) * 2007-06-11 2008-12-12 Tecknomer Sarl Motorization system for propelling e.g. trawler, has energy converter transforming part/entire heat energy dissipated by heat engine into mechanical energy to drive alternator, and constituted of stirling engine
FR2984411A1 (en) * 2011-12-20 2013-06-21 Peugeot Citroen Automobiles Sa Powertrain for car, has internal combustion engine adapted to supply compressed air into chamber when piston is in position, and compression system adapted to be pulled by energy supplied by exhaust gases of engine
JP2016521534A (en) * 2013-03-22 2016-07-21 エルイーエヌアール カーズ ソシエテ アノニムＬｅｎｒ Ｃａｒｓ Ｓａ Low energy nuclear thermoelectric system
US10781771B1 (en) * 2019-09-22 2020-09-22 Ghasem Kahe Automatic cooling system for combustion engine
DE102011109147B4 (en) 2010-08-09 2022-01-27 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust aftertreatment system for treating an exhaust gas feedstream of an internal combustion engine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340872A1 (en) * 1993-12-01 1994-06-16 Heinz Dr Ing Mueller Engine unit for motor vehicles, generators, etc - with exhaust and heat losses of IC engine used in Stirling motor
EP1624176A4 (en) * 2003-05-13 2012-05-16 Honda Motor Co Ltd Multi-stage stirling engine
EP1624176A1 (en) * 2003-05-13 2006-02-08 HONDA MOTOR CO., Ltd. Multi-stage stirling engine
CN100370128C (en) * 2003-05-13 2008-02-20 本田技研工业株式会社 Multi-stage stirling engine
US7484366B2 (en) 2003-05-13 2009-02-03 Honda Motor Co., Ltd. Multistage stirling engine
GB2442006A (en) * 2006-09-21 2008-03-26 Ray Mason Waste heat driven Stirling engine
WO2008035108A1 (en) * 2006-09-21 2008-03-27 Ray Mason Engine assemblies
GB2442006B (en) * 2006-09-21 2008-08-13 Ray Mason Engine assemblies
FR2917129A1 (en) * 2007-06-11 2008-12-12 Tecknomer Sarl Motorization system for propelling e.g. trawler, has energy converter transforming part/entire heat energy dissipated by heat engine into mechanical energy to drive alternator, and constituted of stirling engine
DE102011109147B4 (en) 2010-08-09 2022-01-27 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust aftertreatment system for treating an exhaust gas feedstream of an internal combustion engine
FR2984411A1 (en) * 2011-12-20 2013-06-21 Peugeot Citroen Automobiles Sa Powertrain for car, has internal combustion engine adapted to supply compressed air into chamber when piston is in position, and compression system adapted to be pulled by energy supplied by exhaust gases of engine
JP2016521534A (en) * 2013-03-22 2016-07-21 エルイーエヌアール カーズ ソシエテ アノニムＬｅｎｒ Ｃａｒｓ Ｓａ Low energy nuclear thermoelectric system
US10781771B1 (en) * 2019-09-22 2020-09-22 Ghasem Kahe Automatic cooling system for combustion engine

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