KR100292891B1 - Safety apparatus of compressed natural gas engine - Google Patents

Safety apparatus of compressed natural gas engine Download PDF

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Publication number
KR100292891B1
KR100292891B1 KR1019960076009A KR19960076009A KR100292891B1 KR 100292891 B1 KR100292891 B1 KR 100292891B1 KR 1019960076009 A KR1019960076009 A KR 1019960076009A KR 19960076009 A KR19960076009 A KR 19960076009A KR 100292891 B1 KR100292891 B1 KR 100292891B1
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KR
South Korea
Prior art keywords
fuel
valve
gas
fuel tank
compressed natural
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KR1019960076009A
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Korean (ko)
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KR19980056739A (en
Inventor
배강수
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이계안
현대자동차주식회사
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Priority to KR1019960076009A priority Critical patent/KR100292891B1/en
Publication of KR19980056739A publication Critical patent/KR19980056739A/en
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Publication of KR100292891B1 publication Critical patent/KR100292891B1/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
    • 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
    • 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
    • F02B21/00—Engines characterised by air-storage chambers
    • 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
    • F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
    • F02M21/0224—Secondary gaseous fuel storages
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PURPOSE: A safety apparatus of a compressed natural gas is provided to prevent a loss of a gas and a generation of an accident by cutting off a gas discharging of the other fuel tank when generating a gas discharging from one of fuel tanks due to over-compression or overheat of the fuel tank. CONSTITUTION: A safety apparatus of a compressed natural gas engine comprises a plurality of fuel tank(1) filled by a compressed natural gas. A fuel of each fuel tank(1) is collected to one fuel line(2). A low pressure regulator(3) and a high pressure regulator(4) control a pressure of the fuel line(2). Fuel of each fuel tank(1) is collected to one fuel line(2). A low pressure regulator(3) and a high pressure regulator(4) control a pressure of the fuel line(2). The pressure controlled fuel is introduced to a fuel mixer(5) and is mixed with air introduced through an air intake(6) at the fuel mixer(5). The mixed fuel is supplied to an engine(7). A safety valve(8), a solenoid valve(9) and a counterflow preventing valve(10) are provided at each outlet of each fuel tank subsequently. A safety valve(8) is opened to discharge a gas to an exterior when the gas discharging pressure of the fuel tank is higher than a constant value. The solenoid valve(9) is opened to supply the fuel to the fuel line when turning on a starting key(20) and is closed to cut off a fuel supplying to the fuel line when turning off the starting key.

Description

압축천연가스 엔진의 안전장치Safety device of compressed natural gas engine

본 발명은 압축천연가스(CNG) 차량의 안전장치에 관한것이다.The present invention relates to a safety device for a compressed natural gas (CNG) vehicle.

압축천연가스를 연료로 사용하는 차량은 도3에 도시하는 것과 같이 연료탱크 (1)에 저장된 연료를 고압레귤레이터(3)와 저압레귤러(4) 및 연료믹서(5)를 거쳐 엔진(7)에 공급하여 연소시키게 된다.As a vehicle using compressed natural gas as fuel, the fuel stored in the fuel tank 1 is transferred to the engine 7 via the high pressure regulator 3, the low pressure regulator 4, and the fuel mixer 5, as shown in FIG. It is supplied and burned.

그런데 압축천연가스를 저장하는 연료탱크(1)는 통상 5-6개의 실린더용기로 구성되고 각 연료탱크(1)가 하나의 가스라인(2)상에 직렬로 연결되어 있으며 각 연 료탱크(1)의 출구에는 가스압력이 규정 압력 이상시 외부로 가스를 방출하는 안전 밸브(8)가 하나씩 구비되어 있다.By the way, the fuel tank (1) for storing the compressed natural gas is usually composed of 5-6 cylinder containers, each fuel tank (1) is connected in series on one gas line (2) and each fuel tank (1) The safety valve 8 which discharges gas to the outside when gas pressure exceeds a predetermined pressure is provided in the exit of ().

또한 그와 함께 시동키의 온·오프에 연동하여 가스라인(2)을 개폐하는 솔레 노이드밸브(9)도 구비되어 있다.In addition, a solenoid valve 9 for opening and closing the gas line 2 in conjunction with the on / off of the ignition key is also provided.

그러나 상기한 구조에 의하면 하나의 연료탱크(1)에 과압 또는 과온 등에 의해서 안전밸브(8)가 열리게 되어 가스를 대기중에 방출하게 될 때 모든 연료탱크 들이 하나의 가스라인으로 직렬 연결되어 있기 때문에 나머지 연료탱크(1)들의 가스도 불필요하게 외부로 누출되어 손실을 가져오고 화재의 위험성이 있었다.However, according to the above structure, when the safety valve 8 is opened in one fuel tank 1 by overpressure or over temperature, and the gas is released into the atmosphere, all the fuel tanks are connected in series with one gas line. The gas in the fuel tanks 1 also leaked to the outside unnecessarily, resulting in loss and risk of fire.

이는 각 솔레노이드밸브(9)를 차단시키는 것에 의해서 나머지 연료탱크(1)들 의 가스누출을 방지하는 것이 가능하나 각 솔레노이드밸브(9)들은 차량의 운행정지 시 안전을 위해 연료를 차단하는 밸브로 시동키의 오프에 연동하여 자동으로 조작 되는 것이기 때문에 주행상태에서는 시동키의 오프 조작을 수행할 수 없다는데서 기인하는 문제점인 것이다.It is possible to prevent gas leakage of the remaining fuel tanks 1 by shutting off each solenoid valve 9, but each solenoid valve 9 is started by a valve that shuts off fuel for safety when the vehicle is stopped. This is a problem due to the inability to perform the off operation of the ignition key in the driving state because it is automatically operated in conjunction with the key off.

또다른 문제점으로는 안전밸브(8)가 열려 연료탱크(1)로부터 가스누출이 있는 상태인데도 이를 운전자가 알수 없어 안전사고의 위험성이 있을 수 있다는 데 있다.Another problem is that although the safety valve 8 is open and there is a gas leak from the fuel tank 1, the driver may not know and there may be a risk of a safety accident.

이에 본 발명은 상기한 문제점을 감안하여 제안된 것으로서 그의 목적으로 하는 것은Therefore, the present invention has been proposed in view of the above problems, and its object is to

복수개의 직렬로 배열된 압축천연가스 연료탱크중 어느 하나의 연료탱크의 과압이나 과온 발생으로 안전밸브가 개방되어 가스 방출시 나머지 연료탱크의 가스 가 방출되는 것을 차단하여 가스의 손실 및 안전사고 발생을 방지하는 압축천연가 스 차량의 안전장치를 제공하는 데 있다. 상기한 목적을 달성하기 위하여 본 발명은 천연압축가스를 저장하는 복수개의 연료탱크와, 상기 각 연료탱크로부터 공급되는 가스를 엔진에 급송하는 연료라인과, 상기 각 연료탱크의 출구에 설치되어 가스압력이 일정치 이상일 때 가스를 외부로 방출 하도록 개방되는 안전밸브와, 시동키의 온·오프에 연동하여 상기 각 연료탱크의 가스공급을 개폐하는 솔레노이드밸브를 포함하여 구성되는 압축천연가스 차량의 연료계에 있어서, 상기 안전밸브가 열려 어느하나의 연료탱크로부터 가스가 외부로 방출될 때 나머지 연료탱크의 가스누출을 차단하는 역류방지밸브가 각각의 연료탱크의 출구에 장착되어 있는 것을 특징으로 한다.The safety valve is opened due to the overpressure or overtemperature of any one of a plurality of compressed natural gas fuel tanks arranged in series to block the release of the gas from the remaining fuel tanks to prevent gas loss and safety accidents. To provide a safety device for compressed natural gas vehicles. In order to achieve the above object, the present invention provides a plurality of fuel tanks for storing natural compressed gas, a fuel line for supplying gas supplied from each fuel tank to an engine, and a gas pressure installed at an outlet of each fuel tank. Fuel system of a compressed natural gas vehicle including a safety valve which is opened to discharge gas to the outside when the predetermined value is above a certain value, and a solenoid valve which opens and closes the gas supply of each fuel tank in association with on / off of the ignition key. In the above, the safety valve is open, characterized in that the non-return valve for preventing the gas leakage of the remaining fuel tank when the gas is discharged to the outside is mounted to the outlet of each fuel tank.

도 1 은 본 발명에 의한 압축천연가스 엔진의 안전장치를 나타내는 도면1 is a view showing a safety device of a compressed natural gas engine according to the present invention

도 2 는 본 발명의 역류방지 밸브의 상세도Figure 2 is a detailed view of the non-return valve of the present invention

도 3 은 종래기술3 is a prior art

※도면의 주요부분에 대한 부호의 설명※ Explanation of symbols for main parts of drawing

1 : 연료탱크 2 : 연료라인1: fuel tank 2: fuel line

8 : 안전밸브 9 : 솔레노이드밸브8: safety valve 9: solenoid valve

10 : 역류방지 밸브 11 : 밸브시트10: non-return valve 11: valve seat

12 : 밸브 13 : 리턴스프링12: valve 13: return spring

14 : 표시기14 indicator

이하 본 발명의 구성과 작용을 첨부한 도면을 참조하여 설명한다.Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

도 1 은 본 발명에 의한 압축천연가스 차량의 안전장치를 나타내는 도면으로 도면중 부호 1은 압축천연가스가 충진되어 있는 복수개의 연료탱크이며 각 연료탱 크(1)는 하나의 연료라인(2)으로 모아진 후 고압레귤레이터(3)와 저압레귤레이터 (4)를 거쳐 압력이 조정되어져 연료믹서(5)로 들어가며 연료믹서(5)에서 에어인테이크(6)를 통해 유입되는 공기와 혼합되어 엔진(7)에 공급되어지게 된다.1 is a view showing a safety device for a compressed natural gas vehicle according to the present invention, wherein 1 is a plurality of fuel tanks filled with compressed natural gas, and each fuel tank 1 has one fuel line 2. The pressure is adjusted through the high pressure regulator (3) and the low pressure regulator (4) to enter the fuel mixer (5), and mixed with the air flowing through the air intake (6) from the fuel mixer (5). To be supplied.

상기 각 연료탱크(1)의 출구마다에는 안전밸브(8)와 솔레노이드밸브(9) 및 역류방지밸브(10)가 차례로 마련되어 있다.At each outlet of the fuel tank 1, a safety valve 8, a solenoid valve 9, and a non-return valve 10 are provided in sequence.

상기 안전밸브(8)는 연료탱크(1)의 가스배출압력이 일정치 이상이 되면 개방 되어 가스를 외부로 방출하는 밸브이며 상기 솔레노이드밸브(9)는 연료의 공급을 개폐하는 밸브로서 시동키(10)의 온시에는 개방되어 연료라인(2)을 따라 연료가 공급되며 시동키(20)의 오프시에는 폐쇄되어 연료라인(2)을 통한 연료의 공급을 차단 하게 된다.The safety valve (8) is a valve for opening the gas discharged to the outside when the gas discharge pressure of the fuel tank 1 is a predetermined value or more and the solenoid valve (9) is a valve for opening and closing the supply of fuel as a start key ( 10 is turned on to supply fuel along the fuel line 2 and closed when the ignition key 20 is turned off to block the supply of fuel through the fuel line 2.

그리고 상기 역류방지밸브(10)는 밸브시트(11)와 밸브시트(11)를 개폐하는 밸브(12)와 벨브(12)를 탄발지지하는 리턴스프링(13)으로 구성되어 가스의 흐름 방 향이 연료공급 방향과 반대로 일어나게 될 때 상기 밸브(12)가 밸브시트(11)에 당 접하여 관로를 차단하므로써 가스가 역류하는 것을 방지하게 된다.In addition, the non-return valve 10 includes a valve seat 11, a valve 12 opening and closing the valve seat 11, and a return spring 13 supporting the valve 12. When the reverse occurs in the supply direction, the valve 12 is in contact with the valve seat 11 to block the conduit to prevent the back flow of gas.

그리고 상기 밸브시트(11) 절연된 형태의 전극이 양측으로 매설되어 있어 상기 밸브(12)가 밸브시트(11)에 밀착할 때 회로를 통전시켜 운전석 계기판에 마련된 표시기(14), 예를들면 경보음 발생이나 경고등은 점등시키게 된다.And the valve seat 11 of the insulated form When the electrode 12 is buried on both sides and the valve 12 is in close contact with the valve seat 11, the circuit is energized to turn on the indicator 14 provided in the driver's seat instrument panel, for example, an alarm sound or a warning light.

이와같은 본 발명은 어느하나의 안전밸브가 개방되어 당해 연료탱크내의 가스가 외부로 방출될 때 나머지 연료탱크내의 가스가 개방되어 저압측이 된 안전밸 브측으로 역류를 일으키게 되는 데 이때 역류방지밸브(10)가 관로를 차단하므로써 타 연료탱크들의 가스의 외부누출을 방지하게 되며 또한 밸브(12)가 밸브시트(11) 에 당접하는 순간 운전석 계기판의 표시기(14)가 점등되어 운전자는 연료탱크의 가 스방출이 있음을 알게 되며 표시기(14)는 연료탱크(1)의 숫자대로 표시할 수 있도록 하면 문제가 발생된 연료탱크의 번호까지도 알 수 있게 된다.In the present invention, when any one safety valve is opened and the gas in the fuel tank is discharged to the outside, the gas in the remaining fuel tank is opened to cause a reverse flow to the safety valve side that becomes the low pressure side. 10) prevents the external leakage of gas from other fuel tanks by blocking the pipeline, and the indicator 14 of the driver's seat instrument panel lights up at the moment the valve 12 contacts the valve seat 11 so that the driver It is known that there is a discharge, and the indicator 14 can display the number of the fuel tank in which the problem occurs when the indicator of the fuel tank 1 can be displayed numerically.

이상과 같은 본 발명에 의하면 압축천연가스를 저장하는 연료탱크의 출구마 다에 역류방지밸브를 설치하고 역류방지밸브가 가스의 역류를 차단하도록 작동할 때 표시기를 통해 알수 있도록 하므로써 어느 하나의 연료탱크의 안전밸브가 열려 가스를 외부로 방출하게 되더라도 나머지 연료탱크의 가스누출은 역류방지 밸브에 의해 차단되어지게 되어 불필요한 가스의 손실 및 화재위험을 방지하게 되는 효과가 있다.According to the present invention as described above any one fuel tank by installing a non-return valve at the outlet of the fuel tank for storing the compressed natural gas and by knowing through the indicator when the non-return valve is operated to block the back flow of gas Even if the safety valve is opened and the gas is discharged to the outside, the gas leakage of the remaining fuel tank is blocked by the non-return valve to prevent unnecessary gas loss and fire risk.

Claims (1)

천연압축가스를 저장하는 복수개의 연료탱크와,A plurality of fuel tanks storing natural compressed gas, 상기 각 연료탱크로부터 공급되는 가스를 엔진에 급송하는 연료라인과, 상기 각 연료탱크의 출구에 설치되어 가스압력이 일정치 이상일 때 가스를 외부로 방출 하도록 개방되는 안전밸브와, 시동키의 온·오프에 연동하여 상기 각 연료탱크의 가스공급을 개폐하는 솔레노이드밸브를 포함하여 구성되는 압축천연가스 차량의 연료계에 있어서, 관로(2) 내에 형성되는 밸브시트(11)와, 상기 밸브시트(11)를 개폐하는 밸 브(12)와, 밸브(12)를 탄발지지하는 리턴스프링(13)으로 구성되어 가스의 흐름 방 향이 연료공급 방향과 반대로 일어나게 될 때 상기 밸브(12)가 밸브시트(11)에 당접하여 관로를 차단하는 역류방지밸브를 각각의 연료탱크의 출구에 장착하되,상기 밸브시트(11)에 절연된 형태의 전극이 양측으로 매설하고; 상기 밸브 (12)가 밸브시트(11)에 밀착되어 회로가 통전될때 경보음 또는 경고등을 점등 하는 표시기(14)를 운전석의 계기판에 설치한 것을 특징으로 하는 압축천연가스 차 량의 안전장치.A fuel line for supplying gas supplied from the fuel tanks to the engine, a safety valve installed at an outlet of each fuel tank and open to discharge the gas to the outside when the gas pressure is higher than a predetermined value; In a fuel system of a compressed natural gas vehicle including a solenoid valve for opening and closing a gas supply of each fuel tank in conjunction with an off, a valve seat (11) formed in a conduit (2) and the valve seat (11) The valve 12 is composed of a valve 12 for opening and closing the valve 12, and a return spring 13 for supporting the valve 12 in an elastic manner when the flow direction of the gas occurs opposite to the fuel supply direction. A non-return valve for blocking the pipeline in contact with the outlet) at the outlet of each fuel tank, insulated from the valve seat 11 The electrodes are embedded on both sides; Safety device for a compressed natural gas vehicle, characterized in that the valve (12) is in close contact with the valve seat (11) provided with an indicator (14) on the instrument panel of the driver's seat to turn on the alarm sound or warning light when the circuit is energized.
KR1019960076009A 1996-12-30 1996-12-30 Safety apparatus of compressed natural gas engine KR100292891B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101055833B1 (en) 2008-11-04 2011-08-10 기아자동차주식회사 Fuel supply controller of compressed natural gas engine

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KR100482643B1 (en) * 1996-12-30 2005-08-04 현대자동차주식회사 Fuel storage system of cng bus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08158950A (en) * 1994-12-01 1996-06-18 Mazda Motor Corp Fuel supply device of gaseous fuel engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08158950A (en) * 1994-12-01 1996-06-18 Mazda Motor Corp Fuel supply device of gaseous fuel engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101055833B1 (en) 2008-11-04 2011-08-10 기아자동차주식회사 Fuel supply controller of compressed natural gas engine

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