KR20120084375A - Cng engine cooler - Google Patents

Cng engine cooler Download PDF

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Publication number
KR20120084375A
KR20120084375A KR1020110005704A KR20110005704A KR20120084375A KR 20120084375 A KR20120084375 A KR 20120084375A KR 1020110005704 A KR1020110005704 A KR 1020110005704A KR 20110005704 A KR20110005704 A KR 20110005704A KR 20120084375 A KR20120084375 A KR 20120084375A
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South Korea
Prior art keywords
natural gas
compressed natural
heat exchanger
engine
cooling
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KR1020110005704A
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Korean (ko)
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KR101652130B1 (en
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조성배
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두산인프라코어 주식회사
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Priority to KR1020110005704A priority Critical patent/KR101652130B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/16—Other apparatus for heating fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/04—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture
    • F02M31/10—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture by hot liquids, e.g. lubricants or cooling water
    • F02M31/102—Particular constructional characteristics of the shape of the heat exchange surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/04—Lubricant cooler
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/18—Heater
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

PURPOSE: A device for cooling a compressed natural gas engine is provided to control a flow rate of coolants passing through an oil cooler according to the temperature of compressed natural gas. CONSTITUTION: A device for cooling a compressed natural gas engine comprises an oil cooler(100) and a heat exchanger. The heat exchanger heats the compressed natural gas in a gas regulator for combustion. The heat exchanger(106) comprises a plurality of fluid paths as a heater. The heat exchanger is integrally installed with a space between a case of a chiller and a heat exchange plate. The heat exchange plate forms an engine oil path of the oil cooler. The case is formed in the chiller.

Description

압축천연가스 엔진 냉각장치{ＣＮＧ ENGINE COOLER}Compressed Natural Gas Engine Cooling System {ＣＮＧ ENGINE COOLER}

본 발명은 압축천연가스 엔진 냉각장치에 관한 것으로, 특히 엔진오일 쿨러 내부에 열교환기를 일체화시켜 엔진 오일의 냉각과 함께 압축천연가스를 연소에 적당한 온도로 히팅시킬 수 있는 압축천연가스 엔진 냉각장치에 관한 것이다.The present invention relates to a compressed natural gas engine cooler, and more particularly, to a compressed natural gas engine cooler capable of integrating a heat exchanger inside an engine oil cooler and heating compressed natural gas to a temperature suitable for combustion with cooling of the engine oil. will be.

일반적으로, 차량은 엔진에서 사용되는 연료의 종류에 따라 차량의 종류가 분류될 수 있으며, 가솔린을 사용하는 경우 가솔린차량으로 분류되고 경유를 사용하는 경우 디젤차량으로 분류되며, 액화석유가스(LPG)를 사용하는 경우 LPG차량으로 분류되고 압축천연가스(CNG)를 사용하는 경우 CNG차량 등으로 분류된다.In general, a vehicle may be classified into a vehicle type according to the type of fuel used in the engine, and when a gasoline is used, it is classified as a gasoline vehicle, and when a diesel is used, it is classified as a diesel vehicle, and LPG In case of using, it is classified as LPG vehicle, and in case of using compressed natural gas (CNG), it is classified as CNG vehicle.

근래 대도시에는, 자동차 배출가스로 인한 대기오염이 심화되면서 기존의 경유차에 비해 매연이 거의 없고 소음이 적게 나며, 질소산화물 등과 같은 유해물질의 배출이 매우 적은 CNG 버스의 도입이 점진적으로 이루어지고 있다. CNG차량은 연료인 압축천연가스를 높은 압력으로 가스탱크에 저장하고 가스탱크에서 공급되는 가스와 외부의 에어필터로부터 에어컴프레서를 통해 공급되는 압축공기를 혼합기(Mixer)에 공급하여, 상기 혼합기를 통해 혼합된 가스를 엔진의 실린더(또는 연소실)에 공급하여 폭발시킴으로써 동력을 얻는 방식으로 작동된다.In recent years, CNG buses have been gradually introduced in metropolitan cities due to the increased air pollution caused by automobile exhaust gas, which produces little smoke, generates less noise, and emits less harmful substances such as nitrogen oxides. The CNG vehicle stores the compressed natural gas, which is a fuel, in the gas tank at high pressure, and supplies the gas supplied from the gas tank and the compressed air supplied from the external air filter through the air compressor to the mixer, and supplies the gas through the mixer. It is operated in such a way as to obtain power by supplying the mixed gas to the cylinder (or combustion chamber) of the engine to explode.

이와 같은 CNG 차량에서, 엔진의 성능을 최적으로 발휘해 줄 수 있도록 오일을 냉각해 주는 오일 쿨러를 사용하며, 압축된 CNG를 감압할 때 하강된 가스 온도를 연소하기 좋은 적정 온도를 유지해 주기 위하여 가스를 히팅시키는 열교환기를 장착하고 있다.In such a CNG vehicle, an oil cooler that cools the oil to optimize the performance of the engine is used, and when the compressed CNG is decompressed, a gas is maintained to maintain a proper temperature for burning the lowered gas temperature. It is equipped with a heat exchanger to heat.

이러한 종래 기술의 CNG 엔진의 냉각장치의 예가 도 1에 개략적으로 블럭도 형태로 도시되어 있다.An example of such a prior art CNG engine cooling device is shown schematically in block diagram form in FIG. 1.

도 1에 도시된 바와 같이, 냉각수 펌프(1)를 통과한 냉각수는 각기 엔진부분, 가스공급부분, 에어컴프레서 등의 해당 진행경로를 따라 순환된다.As shown in FIG. 1, the coolant that has passed through the coolant pump 1 is circulated along the respective traveling paths of the engine part, the gas supply part, and the air compressor, respectively.

여기서, 상기 엔진부분의 경우, 상기 냉각수 펌프(1)를 통과한 일부의 냉각수는 오일쿨러(2), 실린더블록(3), 실린더헤드(4), 냉각수 서모스탯(5), 라디에이터(6) 및 냉각수 펌프(1)를 따라 순환되면서 엔진을 냉각시킨다.Here, in the case of the engine portion, a part of the coolant passing through the coolant pump (1) is an oil cooler (2), cylinder block (3), cylinder head (4), coolant thermostat (5), radiator (6) And cools the engine while circulating along the coolant pump 1.

상기 가스공급부분의 경우, 상기 냉각수 펌프(1)를 통과한 일부의 냉각수는 가스레귤레이터(7), 열교환기(8), 가스서모스탯(9) 및 냉각수 펌프(1)를 따라 순환되면서 상기 열교환기(8)를 거치는 압축천연가스를 데운다. 상기 가스레귤레이터(7)를 통과한 압축천연가스는 200bar에서 10bar로 압력이 낮아지고, 이와 같이 압력이 낮아진 압축천연가스는 상기 열교환기(8)를 통과하면서 냉각수와 열교환되어 적정 온도까지 가열되고 냉각수는 냉각된다.In the case of the gas supply portion, a part of the cooling water passing through the cooling water pump 1 is circulated along the gas regulator 7, the heat exchanger 8, the gas thermostat 9, and the cooling water pump 1 and the heat exchanger. The compressed natural gas passing through the machine (8) is heated. The compressed natural gas passing through the gas regulator 7 is lowered in pressure from 200 bar to 10 bar, and the compressed natural gas thus reduced in pressure is heat-exchanged with the cooling water while passing through the heat exchanger 8 to be heated to an appropriate temperature and cooled water. Is cooled.

상기 에어컴프레서의 경우, 상기 냉각수 펌프(1)를 통과한 일부의 냉각수는 에어컴프레서(10) 및 냉각수 펌프(1)를 따라 순환되면서 상기 에어컴프레서(10) 및 상기 에어컴프레서(10)를 지나는 압축공기를 냉각시킨다.In the case of the air compressor, a part of the coolant passing through the coolant pump 1 is circulated along the air compressor 10 and the coolant pump 1 while passing through the air compressor 10 and the air compressor 10. Cool the air.

상기 에어컴프레서(10)는 피스톤의 왕복운동을 이용하여 외부로부터 유입되는 공기를 압축시켜 에어 탱크(미도시)에 축압하며, 상기 에어 탱크에 축압된 압축 공기는 브레이크 장치나 도어 개폐장치 등의 구동력으로 사용되게 된다. 도면에서 미설명된 부호(20)는 터보 차져이다.The air compressor 10 compresses air introduced from the outside by using a reciprocating motion of a piston to accumulate air in an air tank (not shown), and the compressed air accumulated in the air tank is a driving force of a brake device or a door opening / closing device. To be used. Unexplained reference numeral 20 in the figure is a turbocharger.

그러나, 종래 기술에 따른 에어컴프레서(10)는 에어컴프레서 헤드만을 냉각시키는 구조이었기 때문에, 상기 에어컴프레서(10)로부터 토출되는 공기를 충분히 냉각시키지 못하여 압축시 발생되는 고온의 열로 인해 오일이 에어컴프레서(10)의 피스톤의 실링과 실린더 내벽 사이를 통하여 넘어와 에어컴프레서(10)를 오염 또는 파손시키거나 상기 에어 탱크를 오염시키는 등의 전체 공기 냉각장치의 품질 문제를 야기시켰다.However, since the air compressor 10 according to the related art has a structure in which only the air compressor head is cooled, the oil may not be sufficiently cooled in the air discharged from the air compressor 10, and thus oil may not be sufficiently cooled. 10. It crossed over between the seal of the piston and the cylinder inner wall and caused quality problems of the entire air cooler such as contaminating or breaking the air compressor 10 or contaminating the air tank.

또한, 상기 오일 쿨러(2)는 도 2에 개략적으로 도시된 바와 같이 판형 냉각기 형태로 오일펌프로부터 유입된 냉각수가 다단으로 적층된 열교환판(21)들 사이의 냉각수 유로(22)를 통하여 유동하는 동안에, 엔진에서 가열된 엔진오일이 오일 쿨러의 유로(23)로 유입되어 열교환판을 통한 냉각수와의 열교환으로 냉각된 다음 엔진으로 배출되는 구조로서 엔진오일만을 냉각시킬 수 있도록 되어 있으며, 냉각수 유로(22)와 엔진오일의 유로(23)가 번갈아 형성된다. In addition, the oil cooler 2 flows through the cooling water flow path 22 between the heat exchange plates 21 in which the coolant flowing from the oil pump in the form of a plate-shaped cooler is stacked in multiple stages as shown in FIG. 2. In the meantime, the engine oil heated in the engine flows into the oil cooler flow path 23 and is cooled by heat exchange with the cooling water through the heat exchanger plate, and then discharged into the engine, thereby cooling only the engine oil. 22 and the flow path 23 of the engine oil are alternately formed.

그러나, 이러한 냉각장치에서 감압과정에서 낮아진 압축천연가스의 온도를 연소에 적정한 온도로 히팅시키기 위한 열교환기는 협소한 엔진룸에 별도로 설치됨에 따라 정비하기 어렵고, 열교환기에서의 누기로 인한 엔진 과열로 인하여 현재 압축 천연가스 엔진의 냉각을 위한 냉각수에서 부동액을, 예를들어 디젤엔진의 경우 30 - 50% 수준으로 함유하여 관리하는데 비하여 엔진 부동액을 60% 수준으로 관리함에 따라 냉각성능의 저하 및 부동액의 과도한 사용으로 인한 비용 상승이 초래되며, 열교환기의 별도 설치에 따라 추가되는 부품이 많아 비용이 크게 상승되는 문제가 있었다.However, the heat exchanger for heating the compressed natural gas lowered in the decompression process to a temperature suitable for combustion is difficult to maintain as it is separately installed in a narrow engine room, and due to engine overheating due to leakage in the heat exchanger, Currently, antifreeze is contained in the cooling water for cooling the compressed natural gas engine, for example, in the case of diesel engines at 30-50% level. There is a cost increase due to use, there is a problem that the cost is greatly increased due to the large number of additional parts according to the separate installation of the heat exchanger.

본 발명은 상기한 종래 CNG 엔진에서의 압축천연가스를 히팅시키기 위한 열교환기가 별도로 엔진룸에 장착되는 구조에 따른 문제점을 해결하기 위하여 안출된 것으로, 감압시 온도가 낮아진 압축천연가스를 연소에 적정한 온도로 히팅시키기 위한 열교환기를 오일쿨러에 일체화시켜 종래의 문제를 개선한 구조의 CNG 엔진 냉각장치의 제공을 목적으로 한다.The present invention was devised to solve the problems caused by the structure that the heat exchanger for heating the compressed natural gas in the conventional CNG engine is mounted in the engine room separately, the temperature suitable for the combustion of the compressed natural gas is reduced at the time of decompression It is an object of the present invention to provide a CNG engine cooling apparatus having a structure in which a heat exchanger for heating furnace is integrated with an oil cooler, thereby improving a conventional problem.

상기한 목적을 달성하기 위하여 본 발명에 따른 압축천연가스 엔진 냉각장치는 요철이 형성된 열교환판들이 다단으로 이격되어 적층되고 그 사이의 공간에 의해 냉각수 유로와 엔진 오일 유로가 번갈아 형성된 구조를 갖는 오일쿨러와, 가스레귤레이터에서의 압축천연가스의 감압시 강하된 온도를 연소를 위한 적정 온도로 히팅시키기 위한 히터로서의 열교환기를 구비하는 압축천연가스 엔진의 냉각장치에 있어서, 상기 히터로서의 열교환기가 복수 개의 유로가 형성되어 엔진 오일을 냉각시키기 위한 상기 오일쿨러의 엔진 오일 유로를 형성하는 상단의 열교환판 상면과 상기 냉각장치의 케이스 사이의 공간에서 일체로 설치되어 구성된다.In order to achieve the above object, the compressed natural gas engine cooling apparatus according to the present invention is an oil cooler having a structure in which heat exchanger plates having irregularities formed therein are spaced apart in multiple stages and alternately formed between the cooling water flow path and the engine oil flow path by spaces therebetween. And a heat exchanger as a heater for heating the temperature lowered during decompression of the compressed natural gas in the gas regulator to an appropriate temperature for combustion, wherein the heat exchanger as the heater is provided with a plurality of flow paths. It is formed integrally installed in the space between the upper surface of the heat exchange plate upper surface and the case of the cooling device formed to form the engine oil flow path of the oil cooler for cooling the engine oil.

또한 상기 열교환기로부터 배출되는 압축천연가스 온도가 연소에 적정한 온도로 유지되도록 상기 열교환기 내부에 서머스탯이 일체로 설치되어 가스 온도를 탐지하여 신호를 출력하며, 그 출력 신호에 응답하여 차량의 전자제어장치에 의해 오일쿨러를 통과하는 냉각수의 유량을 제어하도록 구성될 수 있다.In addition, the thermostat is integrally installed inside the heat exchanger so that the compressed natural gas temperature discharged from the heat exchanger is maintained at a temperature suitable for combustion, and detects the gas temperature and outputs a signal. The controller may be configured to control the flow rate of the cooling water passing through the oil cooler.

또한 상기 열교환기는 복수 개의 열교환판들 사이의 공간으로 압축 천연가스 유로가 형성되며, 엔진 오일 출구측에 인접하여 압축천연가스 입구가 형성되고 엔진 오일 입구측에 인접하여 압축천연가스 출구가 형성될 수 있다.In addition, the heat exchanger may be a compressed natural gas flow path is formed in the space between the plurality of heat exchange plates, the compressed natural gas inlet is formed adjacent to the engine oil outlet side and the compressed natural gas outlet is formed adjacent to the engine oil inlet side. have.

본 발명에 따라, 압축천연가스 엔진에서 엔진 오일의 냉각을 위한 오일쿨러에 압축천연가스의 감압과정에서 강하되는 온도를 연소에 적정한 온도로 보정하기 위한 히터로서의 열교환기를 일체로 구성함으로써, 종래에 별도로 열교환기를 구성하는 것과 비교하여 구조가 콤팩트하게 되고, 부품수가 줄어들며, 또한 정비 공간도 확보할 수 있는 효과가 있다.According to the present invention, by separately configuring a heat exchanger as a heater for correcting the temperature dropped in the decompression process of the compressed natural gas to a temperature suitable for combustion, the oil cooler for cooling the engine oil in the compressed natural gas engine, separately Compared with the construction of the heat exchanger, the structure is compact, the number of parts is reduced, and the maintenance space is also secured.

또한, 열교환기 내부에 서머스탯을 설치하여 배출되는 압축천연가스의 온도에 따라 오일쿨러를 통과하는 냉각수의 유량을 제어할 수 있게 되어 엔진 전체적으로 볼 때 냉각유량 증대 및 냉각 시스템 최적화에 기여할 수 있고, 냉각성능이 향상되는 효과가 있다.In addition, by installing a thermostat inside the heat exchanger, it is possible to control the flow rate of the cooling water passing through the oil cooler according to the temperature of the compressed natural gas discharged, thereby contributing to the increase of the cooling flow and the optimization of the cooling system as a whole. There is an effect that the cooling performance is improved.

도 1은 종래 CNG 엔진의 엔진오일 냉각장치의 구성을 보여주는 개략적인 블럭도.
도 2는 도 1의 오일 쿨러의 구조를 보여주는 개략적인 단면도.
도 3은 본 발명에 따른 CNG 엔진의 개선된 오일쿨러의 개략적인 단면도.
도 4는 압축천연가스 히팅을 위한 열교환기가 일체로 병합되어 개선된 오일쿨러에 의한 CNG 엔진의 냉각장치의 개략적인 블럭도.
도 5는 본 발명에 따른 냉각장치를 채용한 CNG 엔진에서 냉각라디에이터를 통과하는 냉각수의 온도와, 오일쿨러와 일체로 형성된 압축천연가스 열교환기를 통과하는 냉각수 온도 및 대기온도에 대한 그래프.1 is a schematic block diagram showing the configuration of an engine oil cooling apparatus of a conventional CNG engine.
2 is a schematic cross-sectional view showing the structure of the oil cooler of FIG.
3 is a schematic cross-sectional view of an improved oil cooler of a CNG engine according to the present invention.
4 is a schematic block diagram of a CNG engine cooling system with an improved oil cooler incorporating an integrated heat exchanger for compressed natural gas heating.
5 is a graph of the temperature of the cooling water passing through the cooling radiator, the cooling water temperature and the atmospheric temperature passing through the compressed natural gas heat exchanger formed integrally with the oil cooler in the CNG engine employing the cooling device according to the present invention.

이하에서는 본 발명의 실시예를 도시한 첨부 도면을 참고하여 본 발명을 보다 상세히 설명하기로 한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.

도 3은 본 발명에 따라 압축천연가스 열교환기가 일체화된 오일 쿨러로 구성된 압축천연가스 엔진의 냉각장치의 개략적인 블럭도이다. 도면에서 종래 기술과 동일한 부품에 대한 부호는 동일하게 표시하였으며, 본 발명에 따라 일체화되어 개선된 구조의 오일쿨러와 압축천연가스용 열교환기는 각각 도면 부호 100과 106으로 표시하였다.3 is a schematic block diagram of a cooling apparatus of a compressed natural gas engine configured as an oil cooler in which a compressed natural gas heat exchanger is integrated according to the present invention. In the drawings, the same reference numerals are used for the same parts as in the prior art, and the oil cooler and the heat exchanger for compressed natural gas of the integrated structure and improved structure according to the present invention are denoted with reference numerals 100 and 106, respectively.

냉각수 펌프(1)를 통과한 일부의 냉각수는 오일쿨러(100), 실린더블록(3), 실린더헤드(4), 냉각수 서모스탯(5), 라디에이터(6) 및 냉각수 펌프(1)를 따라 순환되면서 엔진을 냉각시키고, 상기 냉각수 펌프(1)를 통과한 일부의 냉각수는 가스레귤레이터(7)와 에어컴프레셔(10)를 거쳐 압축공기를 냉각시킨 다음 냉각수 펌프로 귀환되어 라디에이터로부터 배출된 냉각수와 혼합된다. 이러한 기본적인 냉각수의 순환 과정은 본 발명에 따라 오일쿨러와 일체화된 (점선으로 표시된) 압축천연가스용 열교환기와 서머스탯이 제거된 점을 제외하고는 도 1에서 설명한 바와 동일하다.Some of the coolant passing through the coolant pump (1) is circulated along the oil cooler (100), cylinder block (3), cylinder head (4), coolant thermostat (5), radiator (6) and coolant pump (1). While cooling the engine, a portion of the coolant passing through the coolant pump 1 cools the compressed air through the gas regulator 7 and the air compressor 10, and then returns to the coolant pump to mix with the coolant discharged from the radiator. do. This basic cooling water circulation process is the same as described in FIG. 1 except that the heat exchanger and thermostat for the compressed natural gas (indicated by the dashed lines) integrated with the oil cooler according to the invention are removed.

도 4는 도 3에서 점선으로 개략적으로 표시한 압축천연가스 열교환기가 오일쿨러와 일체화된 구조를 구체적으로 단면도 형태로 보여준다.FIG. 4 is a cross-sectional view illustrating a structure in which the compressed natural gas heat exchanger schematically illustrated by a dotted line in FIG. 3 is integrated with an oil cooler.

본 발명에 따른 오일쿨러(100)는 예를들어 피시본(fishbone) 형태로 요철이 형성된 열교환판(101)들이 다단으로 이격되어 적층되고 그 사이의 공간에 의해 냉각수 유로(102)와 엔진 오일 유로(103)가 번갈아 형성된 구조를 갖는다.In the oil cooler 100 according to the present invention, for example, a heat exchange plate 101 having irregularities in the form of a fishbone is stacked in multiple stages, and the coolant flow path 102 and the engine oil flow path are spaced by the space therebetween. 103 has a structure alternately formed.

상기 오일쿨러는 일측에 형성된 냉각수 입구를 통해 라디에이터로부터 워터펌프(미도시)에 의해 공급되는 냉각수가 유로(102)를 통해 반대쪽의 냉각수 출구쪽으로 열교환판들을 가로질러 유동하는 동안 상기 열교환판들에 인접하여 형성된 엔진 오일 유로(103)를 통해 엔진 연소실에서 가열된 엔진 오일이 유동하면서 열교환판(101)을 통한 열교환에 의해 엔진 오일이 냉각된다. 이러한 기본적인 구조와 기능은 도 2에 도시된 오일쿨러의 구조와 기능과 유사하다.The oil cooler is adjacent to the heat exchange plates while the coolant supplied by the water pump (not shown) from the radiator flows across the heat exchange plates through the flow path 102 to the opposite coolant outlet through a coolant inlet formed on one side. The engine oil is cooled by heat exchange through the heat exchange plate 101 while the engine oil heated in the engine combustion chamber flows through the engine oil flow passage 103 formed thereon. This basic structure and function is similar to the structure and function of the oil cooler shown in FIG.

본 발명에 따라, 상기 오일쿨러(100)의 엔진오일 유로를 형성하는 최상단의 열교환판(101)의 상면과 상기 냉각장치의 케이스(105) 사이의 공간을 확대시키고, 그 확대된 공간에 압축 천연가스 히터로서의 열교환기(106)가 일체로 제공된다.According to the present invention, the space between the upper surface of the upper heat exchange plate 101 forming the engine oil flow path of the oil cooler 100 and the case 105 of the cooling device is enlarged, and the compressed natural A heat exchanger 106 as a gas heater is provided integrally.

상기 압축 천연가스 히터로서의 열교환기(106)는 상기한 오일쿨러의 열교환판(101)과 유사한 판형 열교환기 형태로서 오일쿨러(100)의 최상단의 열교환판(101) 위에 폭과 길이가 상대적으로 작은 열교환판(107)들이 복수단으로 이격되어 적층된 형태로 이루어진다.The heat exchanger 106 as the compressed natural gas heater is in the form of a plate heat exchanger similar to the heat exchanger plate 101 of the oil cooler, and has a relatively small width and length on the heat exchanger plate 101 at the top of the oil cooler 100. The heat exchange plate 107 is formed in a stacked form spaced apart in a plurality of stages.

이와 같은 구조로 열교환판(107)들 사이의 공간으로 이루어지는 압축 천연가스 유로(110)가 복수 개의 층으로 형성되며, 엔진 오일 출구측에 인접하여 압축천연가스 입구(111)가 형성되고 엔진 오일 입구측에 인접하여 압축천연가스 출구(112)가 형성되어 엔진 오일의 유동 방향과 반대로 되게 함으로써 엔진 오일의 체류시간이 가능한 길게 됨으로써 열교환이 효율적으로 이루어지도록 한다. In such a structure, the compressed natural gas flow path 110 including the space between the heat exchange plates 107 is formed in a plurality of layers, and the compressed natural gas inlet 111 is formed adjacent to the engine oil outlet side and the engine oil inlet. Compressed natural gas outlet 112 is formed adjacent to the side to be opposite to the flow direction of the engine oil so that the residence time of the engine oil is as long as possible, so that the heat exchange can be made efficiently.

이로써, 엔진 오일은 오일쿨러(100)에서 냉각수에 의해 냉각됨과 동시에, 상기 오일쿨러(100) 상부에 일체로 설치된 압축천연가스 히터로서의 열교환기(106)에서 압축천연 가스와의 열교환에 의해서 감압 과정에서 낮아진 압축 천연가스의 온도(약 0 ~ -3℃)를 연소하기 적당한 온도(약 30 ℃)로 상승시키면서 엔진오일이 냉각수와 압축천연가스에 의해 동시적이고 이중적인 열교환에 의해 냉각된다.As a result, the engine oil is cooled by the coolant in the oil cooler 100, and at the same time, a pressure reduction process is performed by heat exchange with the compressed natural gas in the heat exchanger 106 as a compressed natural gas heater installed integrally on the oil cooler 100. The engine oil is cooled by simultaneous and dual heat exchange by cooling water and compressed natural gas, while raising the temperature of the compressed natural gas (approximately 0 to -3 ° C) lowered at to a suitable temperature (about 30 ° C) for combustion.

또한, 상기 열교환기(106)의 전단에 서머스탯(120)이 설치되어 가스 온도를 탐지하여 신호를 출력하며, 열교환기(106)에서 배출되는 압축천연가스의 온도가 적정 온도 이상으로 올라갈 경우 그 출력 신호에 응답하여 차량의 전자제어장치(미도시)에 의해 오일쿨러(100)를 통과하는 냉각수의 유량을 제어함으로써 압축천연가스의 배출 온도가 연소하기 적당한 온도(약 30 ℃)로 유지되도록 한다.In addition, the thermostat 120 is installed in front of the heat exchanger 106 detects the gas temperature and outputs a signal, and when the temperature of the compressed natural gas discharged from the heat exchanger 106 rises above an appropriate temperature, In response to the output signal, the flow rate of the cooling water passing through the oil cooler 100 is controlled by the electronic control unit (not shown) of the vehicle so that the discharge temperature of the compressed natural gas is maintained at a temperature suitable for combustion (about 30 ° C.). .

도 5의 그래프들은 본 발명에 따른 냉각장치를 채용한 CNG 엔진에서 냉각라디에이터를 통과하는 냉각수의 온도와, 오일쿨러와 일체로 형성된 압축천연가스 열교환기를 통과하는 냉각수 온도 및 대기온도를 그래프로 보여준다.5 shows graphs of the temperature of the cooling water passing through the cooling radiator, the cooling water temperature and the atmospheric temperature passing through the compressed natural gas heat exchanger formed integrally with the oil cooler in the CNG engine employing the cooling device according to the present invention.

도 5에서 볼 수 있듯이, 라디에이터 입구측의 냉각수 온도는 83~100℃ 수준에서 유지되고, 이때 라디에이터 출구측의 냉각수 온도는 입구측의 냉각수 온도 보다는 통상 5~8 ℃ 낮은 수준이 유지된다. 상기 감압과정에서 낮아진 압축천연가스온도를 연소에 적절한 온도로 히팅하기 위한 열교환기를 통과하는 냉각수 온도는 30~60℃ 수준이다.As can be seen in Figure 5, the cooling water temperature at the radiator inlet side is maintained at 83 ~ 100 ℃ level, wherein the cooling water temperature of the radiator outlet side is usually maintained 5 ~ 8 ℃ lower than the cooling water temperature of the inlet side. The temperature of the cooling water passing through the heat exchanger for heating the compressed natural gas temperature lowered in the decompression process to a temperature suitable for combustion is 30 to 60 ° C.

이때, 엔진 부하가 올라갈수록 엔진오일과 냉각수의 온도가 올라가게 되지만, 이 경우 압축천연가스 유량이 증대하여 열교환기를 통과하는 냉각수 온도는 상기한 수준으로 유지된다.At this time, as the engine load increases, the temperature of the engine oil and the coolant increases, but in this case, the compressed natural gas flow rate increases to maintain the coolant temperature passing through the heat exchanger.

따라서, 엔진 오일의 냉각 효율이 향상됨과 함께 오일쿨러 자체의 크기 또한 최대 70%까지 감소시킬 수 있어 구조를 콤팩트하게 할 수 있고, 압축천연가스의 감압 과정에서 낮아진 온도를 별도의 가열수단 없이도 엔진 오일의 냉각과정에서의 열교환으로 연소에 적정한 온도로 상승시킬 수 있어 연료를 절약할 수 있다.Therefore, the cooling efficiency of the engine oil is improved and the size of the oil cooler itself can also be reduced by up to 70%, making the structure compact, and the engine oil can be reduced even in the decompression process of compressed natural gas without a separate heating means. The heat exchange in the cooling process can raise the temperature suitable for combustion, thereby saving fuel.

본 발명은 CNG 엔진에서 압축천연가스 감압과정에서 온도가 강하되는 가스 온도를 연소에 적정한 온도로 승온시키기 위한 히팅수단과 엔진 오일 냉각을 위한 오일쿨러를 구비하여야 하는 CNG 엔진의 냉각장치의 구조를 콤팩트하게 하고 냉각효율을 향상시키도록 적용할 수 있다. The present invention provides a compact structure of a cooling device of a CNG engine, which must be provided with a heating means for raising the temperature of the gas which is lowered in the compressed natural gas decompression process in the CNG engine to a temperature suitable for combustion and an oil cooler for cooling the engine oil. It can be applied to improve the cooling efficiency.

100 : 오일쿨러 101 : 열교환판
102 : 냉각수가 유로 103 ; 엔진오일 유로
105,107 : 케이스 106 : 열교환기
110 : 유로 120 : 서머스탯.100: oil cooler 101: heat exchange plate
102: coolant flow path 103; Engine Oil Euro
105,107: Case 106: Heat Exchanger
110: Euro 120: Thermostat.

Claims (3)

요철이 형성된 열교환판(101)들이 다단으로 이격되어 적층되고 그 사이의 공간에 의해 냉각수 유로(102)와 엔진 오일 유로(103)가 번갈아 형성된 구조를 갖는 오일쿨러(100)와, 가스레귤레이터에서의 압축천연가스의 감압시 강하된 온도를 연소를 위한 적정 온도로 히팅시키기 위한 히터로서의 열교환기를 구비하는 압축천연가스 엔진의 냉각장치에 있어서,
상기 히터로서의 열교환기(106)는 복수 개의 유로가 형성되어 엔진 오일을 냉각시키기 위한 상기 오일쿨러(100)의 엔진 오일 유로를 형성하는 상기 열교환판(101)의 상면과 상기 냉각장치의 케이스(105) 사이의 공간에서 일체로 설치된 것을 특징으로 하는 압축천연가스 엔진 냉각장치.
The oil cooler 100 having the structure in which the uneven heat exchange plates 101 are stacked in multiple stages and alternately formed with the cooling water flow path 102 and the engine oil flow path 103 by a space therebetween, In the cooling device of the compressed natural gas engine having a heat exchanger as a heater for heating the temperature dropped during the decompression of the compressed natural gas to the appropriate temperature for combustion,
The heat exchanger 106 as the heater has a plurality of flow paths formed thereon, and an upper surface of the heat exchange plate 101 forming an engine oil flow path of the oil cooler 100 for cooling the engine oil and a case 105 of the cooling device. Compressed natural gas engine cooling apparatus, characterized in that integrally installed in the space between).
제 1 항에 있어서,
상기 열교환기(106)로부터 배출되는 압축천연가스 온도가 연소에 적정한 온도로 유지되도록 상기 열교환기 내부에 서머스탯(120)이 일체로 설치되어 가스 온도를 탐지하여 신호를 출력하며, 그 출력 신호에 응답하여 차량의 전자제어장치에 의해 오일쿨러(100)를 통과하는 냉각수의 유량을 제어하는 것인 압축천연가스 엔진 냉각장치.
The method of claim 1,
The thermostat 120 is integrally installed inside the heat exchanger to detect the gas temperature and output a signal so that the compressed natural gas temperature discharged from the heat exchanger 106 is maintained at an appropriate temperature for combustion. In response to controlling the flow rate of the cooling water passing through the oil cooler (100) by the electronic control unit of the vehicle.
제 1 항 또는 제 2 항에 있어서,
상기 열교환기(106)는 복수 개의 열교환판(107)들 사이의 공간으로 압축 천연가스 유로(110)가 형성되며, 엔진 오일 출구측에 인접하여 압축천연가스 입구(111)가 형성되고 엔진 오일 입구측에 인접하여 압축천연가스 출구(112)가 형성된 것인 압축천연가스 엔진 냉각장치.The method according to claim 1 or 2,
The heat exchanger 106 has a compressed natural gas flow path 110 as a space between the plurality of heat exchange plates 107, a compressed natural gas inlet 111 is formed adjacent to the engine oil outlet side, and the engine oil inlet Compressed natural gas engine cooling apparatus is formed adjacent to the compressed natural gas outlet (112).
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105593504A (en) * 2013-07-02 2016-05-18 马勒金属立夫有限公司 Heat exchanger for thermal management systems for the feeding of fuel in internal combustion engines
CN105612339A (en) * 2013-07-02 2016-05-25 马勒金属立夫有限公司 Heat exchanger for feeding of fuel in internal combustion engine
CN105705763A (en) * 2013-07-02 2016-06-22 马勒金属立夫有限公司 Heat exchanger for the feeding of fuel in internal combustion engines
JP2016145529A (en) * 2015-02-06 2016-08-12 ヤンマー株式会社 Biogas engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004285987A (en) * 2003-03-25 2004-10-14 Nikki Co Ltd Heat exchanger for lpg
KR20060019069A (en) * 2004-08-26 2006-03-03 가부시키가이샤 닛키 Apparatus for supplying vaporized gas fuel to engine
KR100748058B1 (en) * 2006-03-15 2007-08-09 민복기 Device for exhausting oil in fuel injection valve for compressed natural gas vehicle
KR20100131810A (en) * 2009-06-08 2010-12-16 두산인프라코어 주식회사 Cooling system of a compressed natural gas engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004285987A (en) * 2003-03-25 2004-10-14 Nikki Co Ltd Heat exchanger for lpg
KR20060019069A (en) * 2004-08-26 2006-03-03 가부시키가이샤 닛키 Apparatus for supplying vaporized gas fuel to engine
KR100748058B1 (en) * 2006-03-15 2007-08-09 민복기 Device for exhausting oil in fuel injection valve for compressed natural gas vehicle
KR20100131810A (en) * 2009-06-08 2010-12-16 두산인프라코어 주식회사 Cooling system of a compressed natural gas engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105593504A (en) * 2013-07-02 2016-05-18 马勒金属立夫有限公司 Heat exchanger for thermal management systems for the feeding of fuel in internal combustion engines
CN105612339A (en) * 2013-07-02 2016-05-25 马勒金属立夫有限公司 Heat exchanger for feeding of fuel in internal combustion engine
CN105705763A (en) * 2013-07-02 2016-06-22 马勒金属立夫有限公司 Heat exchanger for the feeding of fuel in internal combustion engines
JP2016145529A (en) * 2015-02-06 2016-08-12 ヤンマー株式会社 Biogas engine
EP3255272A4 (en) * 2015-02-06 2018-01-17 Yanmar Co., Ltd. Biogas engine

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