KR0147523B1 - Fuel injection device in the combustion chamber for cng engine - Google Patents

Fuel injection device in the combustion chamber for cng engine

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Publication number
KR0147523B1
KR0147523B1 KR1019950059154A KR19950059154A KR0147523B1 KR 0147523 B1 KR0147523 B1 KR 0147523B1 KR 1019950059154 A KR1019950059154 A KR 1019950059154A KR 19950059154 A KR19950059154 A KR 19950059154A KR 0147523 B1 KR0147523 B1 KR 0147523B1
Authority
KR
South Korea
Prior art keywords
fuel
combustion chamber
injector
cng
engine
Prior art date
Application number
KR1019950059154A
Other languages
Korean (ko)
Other versions
KR970045270A (en
Inventor
황계상
Original Assignee
한승준
기아자동차주식회사
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Application filed by 한승준, 기아자동차주식회사 filed Critical 한승준
Priority to KR1019950059154A priority Critical patent/KR0147523B1/en
Publication of KR970045270A publication Critical patent/KR970045270A/en
Application granted granted Critical
Publication of KR0147523B1 publication Critical patent/KR0147523B1/en

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Classifications

    • 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
    • F02M21/0296—Manufacturing or assembly; Materials, e.g. coatings
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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

본 발명은 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치에 관한 것으로, 특히 CNG(Compressed Natural Gas)를 연소실 내에 직접 분사시켜 엔진 성능의 향상을 도모하도록 한 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치로, 일반적이 가솔린 엔진에 사용되는 실린더 헤드(1)의 스파크 플러그(2) 근접위치에 일단에 나사산(111)이 형성되며 이 나사산(111)과 연장형성되는 단턱부(110)에 냉각수 유입방지용 가스킷(10)이 설치되고 내부에 연소실(3)로 통하는 관통구멍(120)이 형성된 외부홀더(100)와; 이 외부홀더(100) 내에 삽입되며 일단에 형성된 단턱부(210)에 가스 유입 방지용 가스킷(20)이 설치되며 내부가 상기 연소실(3)과 연통하는 통로(220)가 형성된 연료공급용 튜브(200)와 ; 이 연료공급 튜브(200)의 일단에 삽입되며 연료를 공급 하기 위한 씨엔지용 인젝터(300)가 장착된다.The present invention relates to a fuel injector in a combustion chamber in a CNG engine. In particular, the fuel in the combustion chamber in a CNG engine is designed to directly inject a compressed natural gas (CNG) into the combustion chamber to improve engine performance. As an injection device, a thread 111 is formed at one end near the spark plug 2 of the cylinder head 1 generally used in a gasoline engine, and cooling water is formed at the stepped portion 110 extending from the thread 111. An outer holder (100) having an inflow preventing gasket (10) installed therein and a through hole (120) connected to the combustion chamber (3) therein; The gas supply preventing tube 200 is inserted into the outer holder 100, and the gas inlet preventing gasket 20 is installed in the stepped portion 210 formed at one end thereof, and a passage 220 in which the inside is in communication with the combustion chamber 3 is formed. )Wow ; It is inserted into one end of the fuel supply tube 200 is equipped with the CNG injector 300 for supplying fuel.

Description

씨엔지(CNG)엔진에서 연소실 내 연료 분사장치Fuel Injector in Combustion Chamber at CNG Engine

제 1 도는, 본 발명 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치가 설치된 상태를나타낸 단면도.1 is a cross-sectional view showing a state in which a fuel injector in a combustion chamber is installed in a CNG engine of the present invention.

제 2 도는, 본 발명 연료 분사장치를 나타낸 도.2 is a view showing a fuel injector of the present invention.

제 3 도는, 본 발명 연료공급 튜브의 요부확대 단면도.3 is an enlarged cross-sectional view of the main portion of the fuel supply tube of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 실린더 헤드 2 : 스파크 플러그1: cylinder head 2: spark plug

3 : 연소실 10 : 냉각수 유입방지용 가스킷3: combustion chamber 10: cooling water inlet gasket

20 : 가스유입방지용 가스킷 100 : 외부홀더20: Gasket for preventing gas inflow 100: External holder

110 : 나사산 120 : 관통구멍110: thread 120: through hole

200 : 연료공급용 튜브 210 : 단턱부200: fuel supply tube 210: stepped portion

220 : 통로 300 : 인젝터220: passage 300: injector

400 : 첵밸브400: check valve

본 발명은 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치에 관한 것으로, 특히 CNG(Compressed natural Gas)를 연소실 내에 직접 분사시켜 엔진 성능의 향상을 도모하도록 한 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치에 관한 것이다.The present invention relates to a fuel injector in a combustion chamber in a CNG engine. In particular, the fuel in the combustion chamber of a CNG engine is designed to directly inject a compressed natural gas (CNG) into the combustion chamber to improve engine performance. It relates to an injection device.

일반적인 가솔린(gasolin) 엔진이 경우 일반적인 포트 분사 타입으로 인텍크 (INTAKE) 메니폴드에 인젝터(injector)가 장착되어 실린더헤드의 인텍크 포트에 연료를 분사하는 형태이다.In the case of a general gasolin engine, an injector is installed in the INTAKE manifold as a general port injection type to inject fuel into an inlet port of the cylinder head.

즉, 현행의 가솔린 엔진 연료분사 방법은 인텍크 메니폴드에 장착된 인텍크에서 연료가 분사되어 인텍크 포트에 연료가 분사된다.That is, in the current gasoline engine fuel injection method, the fuel is injected from the intec mounted on the intec manifold, and the fuel is injected into the intec port.

이때, 연료는 액체 상태가 되므로 직접 연소실에 흡입되는 경우 스파크 플러그(spark plug)에 노킹이 생겨 불착화 현상이 일어날 가능성이 높다.At this time, since the fuel is in a liquid state, when directly sucked into the combustion chamber, knocking occurs on a spark plug, and thus a high possibility of incombustibility occurs.

따라서, 분사되는 시기는 인텍크 밸브가 닫혀있는 상태에서 분사되어 인텍크 부터 밸브까지 도달시 연료가 기화되게 된다.Therefore, the injection timing is injected in the state where the intec valve is closed so that fuel is vaporized when the intec valve reaches the valve.

따라서, 현재 가솔린 엔진에서도 직접 연소실내에 연료를 분사하는 경우도 연구중이나 이 경우 인테크 압력이 약 30-50bar(이때 약 30-50bar는 가솔린 연료의 분무 입경을 작게하여 스파크 플러그에 충돌시 노킹이 일어나지 않도록 하기위한 필요한 압력이다)로 이를 구동시키기 위한 구동력이 필요하며 또한 인텍크 쪽의 가격이 상당히 올라가 차량 가격이 고가가 된다는 문제점이 있다.Therefore, gasoline engines are also currently injecting fuel directly into the combustion chamber, but in this case, the intech pressure is about 30-50 bar (in this case, about 30-50 bar reduces the particle size of the gasoline fuel, so knocking does not occur when it hits the spark plug). The driving force is required to drive it, and there is a problem that the price of the Intec side increases considerably and the vehicle price becomes expensive.

따라서, 본 발명은 상기와 같은 문제점을 해소하기 위한 것으로, 씨엔지 엔진을 채택하고, 여기에 사용되는 연료 상태가 가스상태이므로 공기와의 혼합이 손쉽게 이루어져 믹싱(MIXING)에 전혀없다.Therefore, the present invention is to solve the above problems, adopts the CNG engine, and since the fuel state used here is a gas state, mixing with air is easy and there is no mixing at all.

또한 직접연소실 내에 분사가 되므로 천연 가스 연료가 유입됨으로서 생기는 체적효율을 저감방지에 따른 성능을 향상시키는 데에 있다.In addition, since the injection into the direct combustion chamber, the natural gas fuel is introduced to improve the performance by preventing the volumetric efficiency caused by the inflow.

상기와 같은 목적을 달성하기 위하여 본 발명 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치는, 일반적이 가솔린 엔진에 사용되는 실린더 헤드의 스파크 플러그 근접위치에 일단에 나사산이 형성되며 이 나사산과 연장형성되는 단턱부에 냉각수 유입방지용 가스킷이 설치되고 내부에 연소실로 통하는 관통구멍이 형성된 외부홀더와; 이 외부홀더 내에 삽입되며 일단에 형성된 단턱부에 가스 유입방지용 가스킷이 설치되며 내부가 상기 연소실과 연통하는 통로가 형성된 연료공급용 튜브와; 이 연료공급 튜브의 일단에 삽입되며 연료를 공급하기 위한 씨엔지용 인젝터가 장착됨을 특징으로 한다.In order to achieve the above object, in the CNG engine of the present invention, the fuel injector in the combustion chamber has a thread formed at one end near the spark plug of the cylinder head which is generally used in a gasoline engine, and the thread and the extension are formed. An outer holder having a gasket for preventing the inflow of cooling water from the stepped portion and having a through-hole formed therein; A fuel supply tube inserted into the outer holder and provided with a gas inlet prevention gasket at one end formed at one end thereof, and having a passage communicating with the combustion chamber therein; It is inserted into one end of the fuel supply tube and is characterized in that it is equipped with a CNG injector for supplying fuel.

또한 연료의 분무가 확대되어 연료와 공기의 혼합이 쉽도록 상기 연료공급용 튜브의 일단이 확장된 것을 특징으로 한다.In addition, one end of the fuel supply tube is extended so that the spray of fuel is expanded to facilitate the mixing of fuel and air.

또한 상기 연료공급용 튜브 통로에 연소실 내의 압력이 인젝터에 전달되지 못하고 첵 밸브가 장착됨을 특징으로 한다.In addition, the fuel supply tube passage is characterized in that the pressure in the combustion chamber is not transmitted to the injector is equipped with a check valve.

본 발명은 실린더에 장착되는 점화 플러그 근접위치에 가는 튜브형상의 연료공급용 튜브를 장착하여 직접분사하도록 함으로서, 연료의 상태를 가스상태로 하여 공기와의 혼합이 손쉽게 이루어지도록 하고, 또한 천연가스가 직접 연소실 내에 분사가 되므로써 생기는 체적효율의 저감을 줄일 수가 있다.The present invention is equipped with a tube-shaped fuel supply tube that is close to the spark plug to be mounted on the cylinder to be injected directly, so that the state of the fuel to the gas state to be easily mixed with air, and also natural gas directly It is possible to reduce the reduction in volumetric efficiency caused by injection into the combustion chamber.

이하, 본 발명의 실시 예를 첨부도면에 의하여 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

제 1 도는 본 발명 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치가 설치된 상태를 나타낸 단면도이고, 제 2 도는 본 발명 연료 분사장치를 나타낸 도이며, 제 3 도는 본 발명 연료공급 튜브의 요부확대 단면도이다.1 is a cross-sectional view showing a fuel injector in a combustion chamber installed in the CNG engine of the present invention, Figure 2 is a view showing the fuel injector of the present invention, Figure 3 is an enlarged cross-sectional view of the main portion of the fuel supply tube of the present invention. to be.

본 발명은, 일반적이 가솔린 엔진에 사용되는 실린더 헤드(1)의 스파크 플러그(2) 근접위치에 일단에 나사산(111)이 형성되며 이 나사산(111)과 연장형성되는 단턱부(110)에 냉각수 유입방지용 가스킷(10)이 설치되고 내부에 연소실(3)로 통하는 관통구멍(120)이 형성된 외부홀더(100)와; 이 외부홀더(100) 내에 삽입되며 일단에 형성된 단턱부(210)에 가스 유입방지용 가스킷(20)이 설치되며 내부가 상기 연소실(3)과 연통하는 통로(220)가 형성된 연료공급용 튜브(200)와; 이 연료공급 튜브(200)의 일단에 삽입되며 연료를 공급하기 위한 씨엔지용 인젝터(300)가 장착됨을 본 발명의 기술적 구성으로 한다.According to the present invention, a coolant (111) is formed at one end in a position close to the spark plug (2) of a cylinder head (1) generally used in a gasoline engine, and the coolant is formed at the stepped portion (110) extending from the screw (111). An outer holder (100) having an inflow preventing gasket (10) installed therein and a through hole (120) connected to the combustion chamber (3) therein; The gas supply preventing tube 200 is inserted into the outer holder 100, and the gas inlet preventing gasket 20 is installed in the stepped portion 210 formed at one end thereof, and a passage 220 is formed therein in communication with the combustion chamber 3. )Wow; The technical configuration of the present invention is that the CNG injector 300 is inserted into one end of the fuel supply tube 200 to supply fuel.

또한 상기 연료공급 튜브(200) 일단이 연료의 분무가 확대되어 연료와 공기의 혼합이 쉽도록 확장된다.In addition, one end of the fuel supply tube 200 is expanded to facilitate the mixing of fuel and air by spraying the fuel.

또한 상기 연료공급용 튜브(200) 통로(220)에 연소실(3) 내의 압력이 인젝터(300)에 전달되지 못하도 첵 밸브(400)가 장착된다.In addition, the valve 400 is mounted in the fuel supply tube 200 passage 220 even though the pressure in the combustion chamber 3 is not transmitted to the injector 300.

상기와 같이 구성된 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the fuel injector in the combustion chamber in the CNG engine configured as described above are as follows.

현재 연구중인 씨엔지 차량의 연료분사는 일반적으로 가솔린의 방식 즉 포트 인젝션 타입으로, 여기서는 씨엔지 차량의 연료분사 장치를 연소실에 직접분사하는 연료장치를 구상 제안한다.The fuel injection of the CNG vehicle under study is generally a gasoline method, that is, a port injection type. Here, a fuel device that directly injects the CNG vehicle fuel injection device into a combustion chamber is proposed.

이때, 종래의 가솔린과 동일한 연료 압력의 사용은 불가하므로 일반 포트 분사시 분사하는 압력을 사용한다.At this time, since the same fuel pressure as that of the conventional gasoline cannot be used, the pressure injected during general port injection is used.

또한 씨엔지 인젝터(300)는 일반 내츄럴 가스용 인젝터를 사용하며 연소실내에 삽입되는 부분은 인젝터 부분이 아닌 첵 밸브(400)를 가지며 가는 튜브형상을 갖는 연료공급용 튜브(200)가 설치된다.In addition, the CNG injector 300 uses a general natural gas injector, and a portion inserted into the combustion chamber has a check valve 400 instead of an injector portion, and a fuel supply tube 200 having a thin tube shape is installed.

예를들면 냉각수 통로를 관통할 수 있도록 외부홀더(100)를 장착하고 내부에 연료공급용 튜브(200)를 통과시킨다.For example, the outer holder 100 is mounted to penetrate the cooling water passage and the fuel supply tube 200 is passed therein.

상기 연료공급용 튜브(200)는 분사 상태에서 공급되는 것이 유리하도록 마지막 부분이 확장되어 연료의 분무가 확대됨으로서 연료와 공기의 혼합을 쉽도록 만든다.The fuel supply tube 200 is extended in the last part to advantageously be supplied in the injection state to facilitate the mixing of fuel and air by expanding the spraying of the fuel.

따라서 상기와 같이 설치된 분무장치는 인젝터(300)를 통한 고압 연료가스가 연료공급용 튜브(200)의 통로(220)를 통하여 연소실(3) 내로 들어가 스파크 플러그(2)에 의해 폭발/팽창 압축된다.Therefore, in the spray device installed as described above, the high-pressure fuel gas through the injector 300 enters the combustion chamber 3 through the passage 220 of the fuel supply tube 200 and is exploded / expanded and compressed by the spark plug 2. .

이때, 연소실 내는 고압 상태이 되므로 연료공급 튜브(200)에 첵 밸브(400)를 장착하여 연소실내의 압력이 인젝터(300)에 전달되지 못하도록 한다.At this time, since the combustion chamber is in a high pressure state, the valve 400 is mounted on the fuel supply tube 200 to prevent the pressure in the combustion chamber from being transmitted to the injector 300.

이상과 같이, 본 발명은 실린더에 장착되는 점화 플러그 근접위치에 가는 튜브 형상의 연료공급용 튜브를 장착하여 직접분사하도록 함으로서, 연료의 상태를 가스 상태로 하여 공기와의 혼합이 손쉽게 이루어지도록 하고, 또한 천연가스가 직접 연소실 내에 분사가 되므로써 생기는 체적효율의 저감을 줄일 수가 있다.As described above, the present invention is to be directly injected by mounting a tube-shaped fuel supply tube going to the position near the spark plug mounted on the cylinder, so that the state of the fuel to the gas state to be easily mixed with air, In addition, it is possible to reduce the reduction in volumetric efficiency caused by the direct injection of natural gas into the combustion chamber.

Claims (3)

일반적인 가솔린 엔진에 사용되는 실린더 헤드의 스파크 플러그 근접위치에 일단에 나사산이 형성되며 이 나사산과 연장형성되는 단턱부에 냉각수 유입방지용 가스킷이 설치되고 내부에 연소실로 통하는 관통구멍이 형성된 외부홀더와; 이 외부홀더 내에 삽입되며 일단에 형성된 단턱부에 가스 유입방지용 가스킷이 설치되며 내부가 상기 연소실과 연통하는 통로가 형성된 연료공급용 튜브와; 이 연료공급 튜브의 일단에 삽입되며 연료를 공급하기 위한 씨엔지용 인젝터가 장착됨을 특징으로 하는 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치.An outer holder having a thread formed at one end thereof near a spark plug of a cylinder head used in a general gasoline engine, and a gasket for preventing the inflow of cooling water installed at a stepped portion extending from the thread and having a through hole passing through the combustion chamber; A fuel supply tube inserted into the outer holder and provided with a gas inlet prevention gasket at one end formed at one end thereof, and having a passage communicating with the combustion chamber therein; A fuel injector in a combustion chamber in a CNG engine, which is inserted into one end of the fuel supply tube and is equipped with a CNG injector for supplying fuel. 제 1 항에 있어서, 연료의 분무가 확대되어 연료와 공기의 혼합이 쉽도록 상기 연료공급용 튜브의 일단이 확장된 것을 특징으로 하는 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치.2. The fuel injector of claim 1, wherein one end of the fuel supply tube is extended so that the spraying of the fuel is expanded to facilitate the mixing of the fuel and the air. 제 1 항에 있어서, 상기 연료공급용 튜브 통로에 연소실 내의 압력이 인젝터에 전달되지 못하도 첵 밸브가 장착됨을 특징으로 하는 씨엔지(CNG) 엔진에서 연소실 내 연료 분사장치.2. The fuel injector of a combustion engine of claim 1, wherein the fuel supply tube passage is equipped with a valve to prevent the pressure in the combustion chamber from being transmitted to the injector.
KR1019950059154A 1995-12-27 1995-12-27 Fuel injection device in the combustion chamber for cng engine KR0147523B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101011517B1 (en) * 2008-08-28 2011-01-31 (주)모토닉 Lpi injector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101011517B1 (en) * 2008-08-28 2011-01-31 (주)모토닉 Lpi injector

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