KR20070025125A - Liquid phase lpg injection fuel system for vehicle - Google Patents

Liquid phase lpg injection fuel system for vehicle Download PDF

Info

Publication number
KR20070025125A
KR20070025125A KR1020050080917A KR20050080917A KR20070025125A KR 20070025125 A KR20070025125 A KR 20070025125A KR 1020050080917 A KR1020050080917 A KR 1020050080917A KR 20050080917 A KR20050080917 A KR 20050080917A KR 20070025125 A KR20070025125 A KR 20070025125A
Authority
KR
South Korea
Prior art keywords
pump
fuel
lpg
pump chamber
impeller
Prior art date
Application number
KR1020050080917A
Other languages
Korean (ko)
Inventor
신상익
Original Assignee
르노삼성자동차 주식회사
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 르노삼성자동차 주식회사 filed Critical 르노삼성자동차 주식회사
Priority to KR1020050080917A priority Critical patent/KR20070025125A/en
Publication of KR20070025125A publication Critical patent/KR20070025125A/en

Links

Images

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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • 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
    • 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
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
    • 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
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of 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
    • 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
    • F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/16—Pumping installations or systems with storage reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F04D5/003—Regenerative pumps of multistage type
    • F04D5/006—Regenerative pumps of multistage type the stages being axially offset
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
    • F02D19/026—Measuring or estimating parameters related to the fuel supply system
    • F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
    • 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
    • F02M21/0248—Injectors
    • F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A liquid phase LPG injection fuel system for a vehicle is provided to pump an appropriate amount of LPG corresponding to an engine output even when the voltage relatively lower than a rated output voltage is applied to a DC motor unit of a fuel pump. A liquid phase LPG injection fuel system for a vehicle presses LPG in a fuel tank through a fuel pump(6) arranged in the fuel tank and directly injects LPG to a combustion chamber through an injector. The fuel pump includes a DC motor unit(20) for providing driving force; and a pump unit(30) including a plurality of impellers(31,32) coupled to a driving shaft(21) of the DC motor unit so that the impellers receive driving force from the DC motor unit and press and pump LPG in multiple stages.

Description

차량용 엘피엘아이 연료시스템{LIQUID PHASE LPG INJECTION FUEL SYSTEM FOR VEHICLE}LLP fuel fuel system for vehicle {LIQUID PHASE LPG INJECTION FUEL SYSTEM FOR VEHICLE}

도 1은 본 발명에 따른 차량용 LPLI 연료시스템의 전체적인 구성을 도시한 구성도이다. 1 is a block diagram showing the overall configuration of a vehicle LPLI fuel system according to the present invention.

도 2는 본 발명에 따른 차량용 LPLI 연료시스템의 연료펌프의 구조를 도시한 단면도이다. 2 is a cross-sectional view showing the structure of a fuel pump of a vehicle LPLI fuel system according to the present invention.

도 3은 도 2의 요부를 확대도시한 단면도이다.3 is an enlarged cross-sectional view of the main part of FIG. 2.

도 4는 도 2의 연료펌프에 있어서, 펌프부의 구조를 분해 도시한 사시도이다.4 is an exploded perspective view illustrating a structure of a pump unit in the fuel pump of FIG. 2.

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

6: 연료펌프 20: 직류모터부6: fuel pump 20: DC motor unit

21: 구동축 30: 펌프부21: drive shaft 30: pump portion

31: 제1임펠러 32: 제2임펠러31: first impeller 32: second impeller

33: 제1펌프실 34: 제2펌프실33: first pump chamber 34: second pump chamber

60: 펌프케이스 61: 토출케이스60: pump case 61: discharge case

62: 흡입케이스 63: 구획부재62: suction case 63: partition member

본 발명은 차량용 LPLI 연료시스템에 관한 것으로, 더욱 상세하게는 펌핑능력의 저하가 방지되도록 하면서도 연료펌프의 구동력을 형성하는 직류모터의 수명이 연장되도록 마련된 차량용 LPLI 연료시스템에 관한 것이다.The present invention relates to a vehicle LPLI fuel system, and more particularly to a vehicle LPLI fuel system provided to extend the life of the DC motor to form a driving force of the fuel pump while preventing the reduction in pumping capacity.

일반적으로 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템은 연료탱크 내부의 LPG 연료를 연료펌프를 통해 가압하여 액상상태로 유지되도록 한 후 이를 이송하여 인젝터를 통해 연소실로 직접 분사시키는 액상 LPG 연료공급시스템을 뜻하는 것으로, 베이퍼라이져를 통해 기체 상태의 LPG 연료를 엔진으로 공급하던 기존 LPG 믹서시스템에 비해 연료밀도가 증가되어 엔진의 출력이 향상되도록 하고, 인젝터를 통한 연료의 정밀제어분사를 통해 배기가스 유해물질이 저감되도록 하는 등의 이점을 갖게 되어 최근 주목 받고 있다. In general, the LPLI (Liquid Phase LPG INJECTION) fuel system for vehicles is a liquid LPG fuel supply system that pressurizes LPG fuel in a fuel tank through a fuel pump to be kept in a liquid state, and then transfers it and injects it directly into a combustion chamber through an injector. In other words, compared to the existing LPG mixer system that supplied gaseous LPG fuel to the engine through the vaporizer, the fuel density is increased to improve the output of the engine. Attention has recently been drawn to have the advantage of reducing the material.

종래 이러한 차량용 LPLI 연료시스템은 연료탱크와, 인젝터가 설치된 연료레일을 구비하며, 이들 사이에는 각각 연료공급라인과 연료리턴라인이 설치된다. Conventionally, such a vehicle LPLI fuel system includes a fuel tank and a fuel rail provided with an injector, and a fuel supply line and a fuel return line are installed therebetween.

연료탱크의 내부에는 액상의 LPG를 가압하여 연료공급라인을 따라 인젝터로 공급하기 위한 연료펌프가 설치되고, 연료공급라인에는 연료펌프의 구동시 개방되도록 체크밸브 형태의 차단밸브가 설치되며, 연료리턴라인에는 인젝터 측 LPG압력이 연료탱크 내부의 LPG압력보다 소정크기 더 크게 형성되도록 하여 연료분사압을 형성하기 위한 압력레귤레이터가 설치된다. 이 압력레귤레이터는 상기 차단밸브와 함께 압력조절유닛을 형성하고, 이러한 LPLI 연료시스템의 각 구성은 엔진의 출력 모드에 따라 ECU를 통해 자동으로 제어된다. A fuel pump is installed inside the fuel tank to pressurize the liquid LPG to supply the injector along the fuel supply line, and a check valve type shutoff valve is installed in the fuel supply line so as to open when the fuel pump is driven. The line is provided with a pressure regulator for forming the fuel injection pressure by causing the injector side LPG pressure to be formed to a predetermined size larger than the LPG pressure inside the fuel tank. The pressure regulator forms a pressure regulating unit together with the shutoff valve, and each configuration of this LPLI fuel system is automatically controlled by the ECU according to the output mode of the engine.

이러한 구조를 통해 연료펌프가 구동됨과 동시에 차단밸브가 개방되면, 연료탱크 내부의 액상 LPG는 연료공급라인을 따라 인젝터로 공급되어 액상상태로 분사되고, 이때 인젝터로 분사되는 연료의 분사압력은 상기 압력레귤레이터에 의해 조절되며, 인젝터로부터 분사되지 않은 잔여 연료는 연료리턴라인을 따라 다시 연료탱크로 복귀된다.Through this structure, when the fuel pump is driven and the shutoff valve is opened, the liquid LPG in the fuel tank is supplied to the injector along the fuel supply line and injected in the liquid state, and the injection pressure of the fuel injected into the injector is the pressure Controlled by the regulator, residual fuel not injected from the injector is returned to the fuel tank along the fuel return line.

한편, 상기 연료펌프로는 통상 가솔린 연료공급방식에 채용되는 것과 동일한 직류모터구동방식의 터빈펌프가 채용되는데, 대한민국 공개특허공보 공개번호 10-2004-0065687호에는 이러한 종래 연료펌프의 대표적인 일례가 개시된다. On the other hand, the fuel pump is adopted a turbine pump of the same DC motor drive system that is usually employed in the gasoline fuel supply system, Republic of Korea Patent Publication No. 10-2004-0065687 discloses a representative example of such a conventional fuel pump do.

이러한 연료펌프는 하우징과, 하우징 내부에 설치되는 것으로 연료펌핑을 위한 구동력을 제공하는 구동부와, 구동부의 구동력을 전달받아 연료의 펌핑작용을 수행하는 펌프부를 구비한다. The fuel pump includes a housing, a driving unit which is installed inside the housing and provides a driving force for fuel pumping, and a pump unit which receives the driving force of the driving unit and performs a pumping operation of the fuel.

구동부는 통상의 직류모터로 마련되어 하우징의 상부 내측에 설치되고, 펌프부는 하우징의 하부 내측에 설치되며, 구동부의 구동축은 펌핑부 측으로 연장된다. The drive unit is provided with a normal DC motor and installed inside the upper part of the housing, the pump part is installed inside the lower part of the housing, and the drive shaft of the drive unit extends to the pumping part side.

펌프부는 직류모터의 구동축과 함께 회전하도록 구동축에 설치되는 임펠러와, 임펠러를 내부에 수용하도록 마련된 케이스를 구비한다. 임펠러의 외주 측에는 원주방향을 따라 복수의 날개가 형성된 날개부가 마련되고, 임펠러 외곽 측 케이스에는 날개부의 형성방향을 따라 “C"자 형상으로 형성되어 상기 날개부를 감싸도록 마련된 펌프실이 형성되며, 케이스의 일측과 타측에는 펌프실의 시작단에 연결되는 흡입구 및 펌프실의 끝단에 연결되는 토출구가 각각 형성된다. The pump unit includes an impeller installed on the drive shaft to rotate together with the drive shaft of the DC motor, and a case provided to accommodate the impeller therein. On the outer circumferential side of the impeller is provided a wing portion formed with a plurality of wings along the circumferential direction, the impeller outer side case is formed in a "C" shape along the forming direction of the wing portion is formed a pump chamber provided to surround the wing portion, One side and the other side is formed with an inlet connected to the start of the pump chamber and the discharge port connected to the end of the pump chamber, respectively.

따라서 ECU의 제어에 따라 상기 구동부로 전원이 인가되어 구동축과 함께 임펠러가 회전하게 되면, 연료탱크 내부의 냉매는 임펠러의 회전시 부력발생에 의한 압력차로 상기 흡입구를 통해 펌프실로 흡입되고, 이후 계속적인 임펠러의 회전으로 펌프실 내부에서 발생하게 되는 회전류에 의해 압력이 상승됨에 따라 연료펌프 외측으로 이송되어 연료공급라인 쪽으로 가압 토출된다.Therefore, when the power is applied to the driving unit under the control of the ECU and the impeller rotates together with the driving shaft, the refrigerant inside the fuel tank is sucked into the pump chamber through the inlet through the pressure difference due to the buoyancy generated during the rotation of the impeller, and then continuously As the pressure is increased by the rotational flow generated inside the pump chamber due to the rotation of the impeller, the fuel is transferred to the outside of the fuel pump and discharged to the fuel supply line.

그러나 이러한 LPLI 연료시스템에 채용된 연료펌프는 가솔린에 비해 점성이 작은 LPG를 펌핑하게 되는 만큼, 동일한 전압이 상기 구동부에 인가된다 하더라도 가솔린 연료공급시스템에 채용되어 가솔린을 펌핑하는 경우 보다 적은 량의 LPG를 펌핑하게 된다. However, the fuel pump employed in the LPLI fuel system pumps LPG, which is less viscous than gasoline, so that even if the same voltage is applied to the driving unit, the LPG fuel pump is employed in the gasoline fuel supply system to pump gasoline. Will be pumped.

따라서 이러한 연료펌프를 통해 엔진 출력에 맞는 적정유량의 액상 LPG를 인젝터 측으로 공급하기 위해서는 상대적으로 높은 전압이 구동부에 인가되도록 하여 항상 임펠러를 고속으로 회전시켜야 하기 때문에 구동부의 수명이 단축되는 문제점이 발생하며, 구동부의 수명을 연장시키기 위해 구동부에 인가되는 전압을 낮추게 되면 연료펌프의 펌핑능력이 저하되는 또 다른 문제점이 발생하게 된다.Therefore, in order to supply the liquid LPG with an appropriate flow rate corresponding to the engine output to the injector through such a fuel pump, a relatively high voltage is applied to the driving unit, so that the impeller must be rotated at a high speed. In addition, when the voltage applied to the driving unit is lowered to extend the life of the driving unit, another problem occurs that the pumping capability of the fuel pump is lowered.

본 발명은 이러한 문제점을 해결하기 위한 것으로, 본 발명의 목적은 연료펌프의 펌핑능력 저하가 방지되도록 하면서도 연료펌프의 구동력을 형성하는 구동부의 수명이 연장되도록 마련된 차량용 LPLI 연료시스템을 제공하는 것이다. The present invention is to solve this problem, an object of the present invention is to provide a LPLI fuel system for a vehicle provided to extend the life of the driving unit to form a driving force of the fuel pump while preventing the pumping capacity of the fuel pump is prevented.

이러한 목적을 달성하기 위해 본 발명에 따른 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템은 연료탱크의 LPG를 상기 연료탱크 내부에 마련된 연료펌프를 통해 가압하여 액상상태로 유지되도록 한 상태에서 인젝터를 통해 연소실로 직접 분사되도록 마련되고, 상기 연료펌프는 구동력을 제공하는 직류모터부와, 상기 직류모터부의 구동력을 전달받아 LPG를 다단으로 가압하여 펌핑하도록 상기 직류모터부의 구동축에 결합된 복수의 임펠러를 포함하는 펌프부를 구비하도록 마련된 것을 특징으로 한다. In order to achieve this object, the LPLI fuel system for vehicles according to the present invention pressurizes LPG of a fuel tank through a fuel pump provided inside the fuel tank to maintain a liquid state in a combustion chamber through an injector. It is provided to be injected directly to the fuel pump, the fuel pump includes a DC motor unit for providing a driving force, and a plurality of impeller coupled to the drive shaft of the DC motor unit to pump by pressing the LPG in multiple stages by receiving the driving force of the DC motor unit. Characterized in that provided with a pump unit.

그리고 상기 임펠러의 외주 측에는 원주방향을 따라 복수의 날개가 형성된 날개부가 마련되고, 상기 펌프부는 상기 각 임펠러의 외곽 측에 상기 날개부의 형성방향을 따라 “C"자 형상으로 형성되어 상기 날개를 감싸도록 마련된 복수의 펌프실을 더 포함하며, 상기 각 펌프실의 끝단은 인접한 직 하류 측 펌프실의 시작단에 연결되도록 마련된 것을 특징으로 한다.And the outer circumferential side of the impeller is provided with a wing portion formed with a plurality of wings in the circumferential direction, the pump portion is formed in the "C" shape along the formation direction of the wing portion on the outer side of each impeller to surround the wing It further comprises a plurality of pump chambers, characterized in that the end of each pump chamber is provided to be connected to the start of the adjacent downstream downstream pump chamber.

또한 상기 펌프부는 상기 복수의 임펠러가 내부에 수용되도록 상호 결합되되 각각 흡입구와 토출구가 형성된 흡입케이스 및 토출케이스와, 상기 흡입 및 토출케이스 사이에 개재되는 구획부재를 더 포함하고, 상기 임펠러는 상기 흡입케이스와 구획부재 사이에 수용되는 제1임펠러와, 상기 구획부재와 토출케이스 사이에 수용되는 제2임펠러를 포함하여 한 쌍으로 마련되고, 상기 펌프실은 상기 흡입케이스와 구획부재 사이에 마련되는 제1펌프실과, 상기 구획부재와 토출케이스 사이에 마련되는 제2펌프실을 포함하여 한 쌍으로 마련된 것을 특징으로 한다.The pump unit may further include a suction case and a discharge case coupled to each other such that the plurality of impellers are accommodated therein, the suction and discharge cases being formed therebetween, and a partition member interposed between the suction and discharge cases. A first impeller accommodated between the case and the partition member, and a second impeller accommodated between the partition member and the discharge case, the pump chamber being provided between the suction case and the partition member; And a pump chamber and a second pump chamber provided between the partition member and the discharge case.

또한 상기 제1펌프실의 시작단은 상기 흡입구에 연결되고, 상기 제2펌프실의 끝단은 상기 토출구에 연결되며, 상기 구획부재에는 상기 제1펌프실의 끝단과 상기 제2펌프실의 시작단을 연결하는 연결홀이 마련된 것을 특징으로 한다.In addition, the start end of the first pump chamber is connected to the suction port, the end of the second pump chamber is connected to the discharge port, the partition member is connected to connect the end of the first pump chamber and the start end of the second pump chamber A hall is provided.

다음은 본 발명에 따른 바람직한 실시예를 첨부된 도면을 참조하여 상세하게 설명하도록 한다.Next, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 차량용 LPLI 연료시스템은 도 1에 도시된 바와 같이, 연료탱크(1)와, 인젝터(2)가 설치된 연료레일(3)을 구비하며, 이들 사이에는 각각 연료공급라인(4)과 연료리턴라인(5)이 설치된다. The LPLI fuel system for a vehicle according to the present invention has a fuel tank 1 and a fuel rail 3 provided with an injector 2, as shown in FIG. 1, between which a fuel supply line 4 and The fuel return line 5 is installed.

연료탱크(1)의 내부에는 액상의 LPG를 가압하여 연료공급라인(4)을 따라 인젝터(2)로 공급하기 위한 연료펌프(6)가 설치되고, 연료공급라인(4)에는 연료펌프(6)의 구동시 개방되도록 체크밸브 형태의 차단밸브(7)가 설치되며, 연료리턴라인(5)에는 인젝터(2) 측 LPG압력이 연료탱크(1) 내부의 LPG압력보다 소정크기 더 크게 형성되도록 하여 연료분사압을 형성하기 위한 압력레귤레이터(8)가 설치된다. A fuel pump 6 is installed inside the fuel tank 1 to pressurize the liquid LPG to supply the injector 2 along the fuel supply line 4, and the fuel pump 6 is installed in the fuel supply line 4. A check valve-type shutoff valve 7 is installed to open when the fuel cell is driven, and the LPG pressure on the injector 2 side is formed to be larger than the LPG pressure inside the fuel tank 1 in the fuel return line 5. Is provided with a pressure regulator 8 for forming a fuel injection pressure.

여기서 상기 압력레귤레이터(8)는 상기 차단밸브(7)와 함께 압력조절유닛(9)을 형성하고, 이러한 LPLI 연료시스템의 각 구성은 엔진의 출력모드에 따라 ECU(10)를 통해 자동으로 제어된다. Here, the pressure regulator 8 forms a pressure regulating unit 9 together with the shutoff valve 7, and each configuration of the LPLI fuel system is automatically controlled by the ECU 10 according to the output mode of the engine. .

이러한 구조를 통해 연료펌프(6)가 구동됨과 동시에 차단밸브(7)가 개방되면, 연료탱크(1) 내부의 액상 LPG는 연료공급라인(4)을 따라 인젝터(2)로 공급되어 액상상태로 분사되고, 이때 인젝터(2)로 분사되는 연료의 분사압력은 상기 압력레귤레이터(8)에 의해 조절되며, 인젝터(2)로부터 분사되지 않은 잔여 LPG는 연료리턴라인(5)을 따라 다시 연료탱크(1)로 복귀된다. Through this structure, when the fuel pump 6 is driven and the shutoff valve 7 is opened, the liquid LPG in the fuel tank 1 is supplied to the injector 2 along the fuel supply line 4 to the liquid state. The injection pressure of the fuel injected into the injector 2 is controlled by the pressure regulator 8, and the remaining LPG not injected from the injector 2 is again supplied along the fuel return line 5. Return to 1).

또 LPG는 연료특성상 부탄과 프로판의 비율이 계절마다 다르게 형성되기 때 문에, 같은 부피의 액상 LPG를 인젝터(2)로 분사하게 되더라도 LPG의 조성에 따라 연소실에서 발생하는 발열량이 달라지게 되면서 엔진의 출력이 변하게 될 우려가 있다.In addition, LPG has a different ratio of butane and propane due to its fuel characteristics, so even if the same volume of liquid LPG is injected into the injector 2, the amount of heat generated in the combustion chamber varies depending on the composition of the LPG. The output may change.

따라서 상기 압력조절유닛(9) 측 연료리턴라인(5) 측에는 온도센서(9a)와 압력센서(9b)가 설치되고, ECU(10)는 이러한 온도센서(9a)와 압력센서(9b)를 통해 얻은 LPG의 온도와 압력을 LPG 증기압 선도와 비교하여 연료탱크(1) 내부 LPG 조성을 추정하고, 이렇게 추정된 LPG 조성에 따라 연료펌프(6)와 압력레귤레이터(8)를 제어하여 연료조성비에 관계없이 일정한 엔진출력이 발휘되도록 한다.Therefore, the temperature sensor 9a and the pressure sensor 9b are installed on the fuel return line 5 side of the pressure regulating unit 9, and the ECU 10 uses the temperature sensor 9a and the pressure sensor 9b. The LPG temperature and pressure of the obtained LPG are compared with the LPG vapor pressure diagram to estimate the LPG composition inside the fuel tank (1), and the fuel pump (6) and the pressure regulator (8) are controlled in accordance with the estimated LPG composition, regardless of the fuel composition ratio. Ensure constant engine power.

한편, 연료탱크(1) 내부의 LPG를 펌핑하도록 마련된 상기 연료펌프(6)는 도 2에 도시된 바와 같이, 구동력을 제공하는 직류모터부(20)와, 직류모터부(20)의 구동력을 전달받아 LPG를 2단으로 가압하여 펌핑하도록 상기 직류모터부(20)의 구동축(21)에 결합된 한 쌍의 임펠러(31,32)를 포함하는 펌프부(30)를 구비한다. On the other hand, the fuel pump 6 provided to pump the LPG in the fuel tank 1, as shown in Figure 2, the DC motor unit 20 for providing a driving force and the driving force of the DC motor unit 20 The pump unit 30 includes a pair of impellers 31 and 32 coupled to the drive shaft 21 of the DC motor unit 20 to pump the LPG to the second stage by receiving the pump.

이와 같이 직류모터부(20)의 구동축(21)에 결합되는 펌프부(30)의 임펠러가 한 쌍으로 마련되도록 한 연료펌프(6)의 구성은 이러한 연료펌프(6)가 가솔린에 비해 점성이 작은 LPG를 펌핑하도록 마련된 것임을 감안 한 것으로, 하나의 임펠러만을 구비하는 종래 연료펌프의 구동부에 인가되던 전압보다 상대적으로 낮은 전압이 상기 직류모터부(20)에 인가되도록 하더라도 각 임펠러(31,32)에 의해 순차적으로 가압된 LPG의 펌핑유량이 엔진출력에 맞는 적정유량이 되도록 하기 위한 것이다. As such, the configuration of the fuel pump 6 such that the impeller of the pump unit 30 coupled to the drive shaft 21 of the DC motor unit 20 is provided in pairs is more viscous than the gasoline. Considering that it is provided to pump a small LPG, each impeller (31, 32) even if a voltage relatively lower than the voltage applied to the driving unit of the conventional fuel pump having only one impeller is applied to the DC motor unit 20 In order to ensure that the pumping flow rate of the LPG sequentially pressurized by the appropriate flow rate suitable for the engine output.

이를 통해 본 발명에 따른 연료펌프(6)는 펌핑능력이 저하되지 않으면서도 직류모터부(20)의 전반적인 회전수가 낮아질 수 있게 되어 직류모터부(20)의 수명 이 연장됨으로써 보다 장기간 사용할 수 있게 된다. Through this, the fuel pump 6 according to the present invention can lower the overall rotational speed of the DC motor unit 20 without lowering the pumping capability, so that the life of the DC motor unit 20 is prolonged and thus can be used for a longer period of time. .

이러한 연료펌프(6)의 상세 구조를 도 2 내지 도 4를 참조하여 설명하면 다음과 같다.Detailed structure of the fuel pump 6 will be described with reference to FIGS. 2 to 4 as follows.

먼저 연료펌프(6)는 상기 직류모터부(20)와 펌프부(30)가 내부에 내장되도록 중공의 원통형상으로 마련된 하우징(40)을 구비하고. 직류모터부(20)는 이러한 하우징(40)의 상부 내측에 위치되며, 펌프부(30)는 하우징(40)의 하부 내측에 하우징(40)의 하단을 덮도록 마련된다. First, the fuel pump 6 is provided with a housing 40 provided in a hollow cylindrical shape so that the DC motor unit 20 and the pump unit 30 are embedded therein. The DC motor unit 20 is located inside the upper part of the housing 40, and the pump part 30 is provided to cover the lower end of the housing 40 inside the lower part of the housing 40.

직류모터부(20)는 하우징(40) 내부에 회전 가능하도록 설치된 회전자(22)와, 회전자(22)의 중심을 관통하도록 회전자(22)에 압입 고정되며 하단이 펌프부(30) 측으로 연장된 상기 구동축(21)과, 회전자(22)와 소정간격 이격되도록 하우징(40)의 내벽에 고정되는 마그네트(23)를 포함하여 구성된다. 회전자(22)의 상단에는 정류자(24)가 돌출 형성되며, 회전자(24)의 외면에는 코일(25)이 감겨진다. The DC motor unit 20 is pressurized and fixed to the rotor 22 so as to pass through the center of the rotor 22 and the rotor 22 installed in the housing 40 and the lower end of the pump unit 30 And a magnet 23 fixed to an inner wall of the housing 40 so as to be spaced apart from the rotor 22 by a predetermined distance. The commutator 24 protrudes from the upper end of the rotor 22, and the coil 25 is wound around the outer surface of the rotor 24.

하우징(40)의 상단에는 펌프부(30)를 통해 연료펌프(6) 내부에서 가압된 LPG가 상기 연료공급라인(4) 측으로 토출되도록 연료토출구(51)가 형성된 펌프커버(50)가 결합되는데, 이러한 펌프커버(50)의 상단에는 전원공급을 위한 전원소켓(52)이 설치되고, 펌프커버(50)의 하단에는 회전자(22)의 회전시 정류자(24)와 단속적으로 접촉되면서 전원소켓(52)으로 공급된 전원을 정류자(24)로 전달하는 브러시(53)가 마련된다. The pump cover 50 having the fuel discharge port 51 is coupled to the upper end of the housing 40 so that the LPG pressurized in the fuel pump 6 through the pump unit 30 is discharged to the fuel supply line 4. The upper end of the pump cover 50 is provided with a power socket 52 for power supply, and the lower end of the pump cover 50 is intermittently in contact with the commutator 24 when the rotor 22 rotates. Brush 53 is provided to transfer power supplied to 52 to commutator 24.

이러한 구조를 통해 전원소켓(52)으로 공급된 전원이 브러시(53)를 통해 정류자(24)로 전달되면 상기 코일(25)과 마그네트(23) 간의 전자기 작용에 의해 회전 자(22)가 회전하게 되고, 이에 따라 회전자(22)에 압입된 구동축(21)이 회전하게 된다. When the power supplied to the power socket 52 is transmitted to the commutator 24 through the brush 53 through the structure, the rotor 22 is rotated by the electromagnetic action between the coil 25 and the magnet 23. As a result, the drive shaft 21 pushed into the rotor 22 is rotated.

참고로 미설명 부호 54와 61a는 각각 펌프커버(50)와 후술하게 될 펌프부(30) 토출케이스(61)에 설치되는 것으로 구동축(21)을 회전 가능하게 지지하도록 마련된 베어링이며, 또 다른 부호 55와 56은 각각 연료펌프(6)의 구동정지시 연료공급라인(4)의 LPG가 연료펌프(6) 내부로 역류되는 것을 방지함과 동시에 연료펌프(6) 내부의 LPG압력이 일정한 잔압을 유지하도록 하여 연료펌프(6)의 재구동시 LPG를 신속히 재펌핑할 수 있도록 연료토출구(51)에 설치되는 체크밸브와, 연료펌프(6) 내부의 압력이 비정상적으로 놓아질 경우 이를 낮출 수 있도록 마련된 안전밸브이다. For reference, reference numerals 54 and 61a are installed in the pump cover 50 and the pump case 30 discharge case 61 to be described later, respectively, and are bearings provided to rotatably support the drive shaft 21. 55 and 56 respectively prevent the LPG of the fuel supply line 4 from flowing back into the fuel pump 6 when the driving of the fuel pump 6 is stopped, and at the same time, the LPG pressure inside the fuel pump 6 maintains a constant residual pressure. Check valve is installed in the fuel discharge port 51 so that the LPG can be re-pumped quickly when the fuel pump 6 is restarted, and the pressure inside the fuel pump 6 is lowered if it is abnormally released. It is a safety valve.

그리고 상기 펌프부(30)는 구동축(21)과 함께 회전하도록 펌프부(30)로 연장된 구동축(21)의 하단부에 소정간격 상호 이격되도록 결합된 2개의 임펠러(31,32)와, 이 2개의 임펠러(31,32)를 내부에 수용하도록 마련된 펌프케이스(60)를 구비한다. The pump unit 30 includes two impellers 31 and 32 coupled to the lower end of the drive shaft 21 extending to the pump unit 30 so as to rotate together with the drive shaft 21 so as to be spaced apart from each other by a predetermined interval. The pump case 60 is provided to accommodate the two impellers 31 and 32 therein.

펌프케이스(60)는 토출구(61b)가 형성되도록 상부에 마련되는 토출케이스(61)와, 흡입구(62a)가 형성되도록 하부에 마련되는 흡입케이스(62)가 상호 결합되어 형성되는데, 이러한 토출케이스(61)와 흡입케이스(62) 사이에는 토출 및 흡입케이스(61,62) 내부공간이 상호 구획되도록 하는 구획부재(63)가 개재되고, 상기 임펠러(31,32)는 흡입케이스(62)와 구획부재(63) 사이에 수용되는 제1임펠러(31)와, 구획부재(63)와 토출케이스(61) 사이에 수용되는 제2임펠러(32)로 구분된다. The pump case 60 is formed by combining the discharge case 61 provided in the upper portion to form the discharge port 61b and the suction case 62 provided in the lower portion so as to form the suction port 62a. A partition member 63 interposed between the 61 and the suction case 62 to allow the internal spaces of the discharge and suction cases 61 and 62 to be partitioned therebetween, and the impellers 31 and 32 are connected to the suction case 62. It is divided into a first impeller 31 accommodated between the partition member 63 and a second impeller 32 accommodated between the partition member 63 and the discharge case 61.

각 임펠러(31,32)와 상기 상하부케이스(61,62) 및 구획부재(63)의 중앙에는 구동축(21)이 관통하도록 각각 관통공(31a,32a,61c,62b,63a)이 형성되며, 각 임펠러(31,32)는 동일한 형상과 치수를 갖도록 마련된다. Through-holes 31a, 32a, 61c, 62b, and 63a are formed in the centers of the impellers 31 and 32, the upper and lower cases 61 and 62, and the partition member 63, respectively, so that the drive shaft 21 penetrates. Each impeller 31, 32 is provided to have the same shape and dimensions.

각 임펠러(31,32)의 외주 측에는 원주방향을 따라 복수의 날개가 형성된 날개부(31b,32b)가 마련되고, 각 임펠러(31,32)의 외곽 측에는 날개부(31b,32b)의 형성방향을 따라 “C"자 형상으로 형성되어 상기 날개부(31b,32b)를 감싸도록 마련된 펌프실(33,34)이 형성되며, 이러한 펌프실(33,34)은 제1임펠러(31) 측 제1펌프실(33)과 제2임펠러(32) 측 제2펌프실(34)로 구분된다. Wing parts 31b and 32b having a plurality of wings are formed along the circumferential direction on the outer circumferential side of each impeller 31 and 32, and forming directions of the wing parts 31b and 32b on the outer side of each impeller 31 and 32. The pump chambers 33 and 34 are formed in the shape of “C” to surround the wing portions 31b and 32b, and the pump chambers 33 and 34 are the first pump chambers on the side of the first impeller 31. It is divided into 33 and the second pump chamber 34 on the second impeller 32 side.

제1펌프실(33)은 각각 제1임펠러(32) 날개부(31b)의 위치에 대응하는 흡입케이스(62)의 상면과 구획부재(63)의 하면에 상호 대칭되도록 “C"자 형상으로 마련된 제1 및 제2그루브(62c,63b)를 통해 형성되고, 제2펌프실(34)은 각각 제2임펠러(32) 날개부(32b)의 위치에 대응하는 구획부재(63)의 상면과 토출케이스(61)의 하면에 역시 상호 대칭되도록 “C"자 형상으로 마련된 제3 및 제4그루브(63c,61d)를 통해 형성된다.The first pump chamber 33 is formed in a “C” shape so as to be symmetrical to the upper surface of the suction case 62 and the lower surface of the partition member 63 respectively corresponding to the position of the first impeller 32 wing 31b. It is formed through the first and second grooves (62c, 63b), the second pump chamber 34 is the upper surface and the discharge case of the partition member 63 corresponding to the position of the blade portion (32b) of the second impeller 32, respectively The lower surface of 61 is formed through the third and fourth grooves 63c and 61d provided in a “C” shape so as to be mutually symmetrical.

그리고 상기 흡입구(62a)는 임펠러(31,32)의 회전방향을 따라 제1그루브(62c)의 시작단 측 흡입케이스(62)에 상기 제1펌프실(33)과 연료탱크(1) 내부를 연결하도록 형성되고, 상기 토출구(61b)는 제4그루브(61d)의 끝단 측 토출케이스(61)에 상기 제2펌프실(34)과 직류모터부(20) 측 하우징(40) 내부를 연결하도록 형성되는데, 여기서 상기 흡입구(62a)는 연료탱크(1)의 LPG가 연료펌프(6) 내부로 흡입되도록 하는 연료펌프(6)의 연료흡입구를 겸하게 되며, 상기 구획부재(63)에는 구획 부재(63)의 하면에 형성된 제2그루브(63b)의 끝단과 상면에 형성된 제3그루브(63c)의 시작단을 연결하는 연결홀(63d)이 마련되어 제1펌프실(33)과 제2펌프실(34)이 상호 연통되도록 한다.In addition, the suction port 62a connects the first pump chamber 33 and the fuel tank 1 to the suction case 62 at the start end side of the first groove 62c along the rotation directions of the impellers 31 and 32. The discharge port 61b is formed to connect the inside of the housing 40 of the second pump chamber 34 and the DC motor unit 20 to the discharge case 61 at the end of the fourth groove 61d. Here, the inlet port 62a serves as a fuel inlet port of the fuel pump 6 to allow the LPG of the fuel tank 1 to be sucked into the fuel pump 6, and the partition member 63 includes a partition member 63. A connection hole 63d is provided to connect the end of the second groove 63b formed on the lower surface of the lower surface and the start end of the third groove 63c formed on the upper surface of the first pump chamber 33 and the second pump chamber 34. Ensure communication.

이러한 펌프부(30)의 구조를 통해 구동축(21)과 함께 제1 및 제2임펠러(31,32)가 회전하게 되면, LGP의 경로를 나타낸 도 4의 A와 같이, 연료탱크(1) 내부의 LPG는 먼저 제1임펠러(31)의 회전에 따른 압력차에 의해 상기 흡입구(62a)를 통해 제1펌프실(33)의 시작단 측으로 흡입된 후 제1펌프실(33)의 끝단으로 측으로 회전류를 형성하면서 1차적으로 압력이 상승된다. When the first and second impellers 31 and 32 rotate together with the drive shaft 21 through the structure of the pump unit 30, as shown in FIG. 4A, which illustrates the path of the LGP, the inside of the fuel tank 1. LPG is first sucked by the pressure difference according to the rotation of the first impeller 31 to the start end side of the first pump chamber 33 through the suction port 62a, and then rotates toward the end of the first pump chamber 33. The pressure is primarily raised while forming

그리고 이와 같이 1차적으로 압력이 상승된 LPG는 상기 연결홀(63d)을 통해 제2펌프실(34)로 재흡입되고, 제2펌프실(34)로 재흡입된 LPG는 제1펌프실(33)에서와 동일한 방식을 통해 더욱 승압된 상태로 상기 토출구(61b)를 통해 펌프부(30) 외측 하우징(40) 내부로 펌핑되며, 이러한 LPG는 계속해서 상기 회전자(22)와 마그네트(23) 사이를 경유한 후 상기 연료토출구(51)를 통해 연료펌프(6) 외부로 토출되면서 상기 연료공급라인(4)을 따라 인젝터(2) 측으로 공급된다. In this way, the LPG in which the pressure is primarily raised is re-intaked into the second pump chamber 34 through the connection hole 63d, and the LPG re-suctioned into the second pump chamber 34 is discharged from the first pump chamber 33. The pump is pumped into the outer housing 40 of the pump unit 30 through the discharge port 61b while being further boosted in the same manner as the above, and the LPG is continuously connected between the rotor 22 and the magnet 23. After passing through the fuel discharge port 51 is discharged to the outside of the fuel pump 6 is supplied to the injector 2 side along the fuel supply line (4).

따라서 상기 연료펌프(6)는 연료탱크(1) 내부의 LPG를 2단으로 가압하여 펌핑할 수 있도록 마련된 상기 펌프부(30)를 통해 종래 LPLI 연료시스템의 연료펌프 구동부에 인가되던 정격출력전압보다 낮은 전압이 상기 직류모터부(20)에 인가되도록 하더라도 엔진출력에 맞는 적정유량의 LPG를 상기 인젝터(2) 측으로 공급할 수 있게 되며, 이를 통해 본 발명에 따른 LPLI 연료시스템은 연료펌프(6)의 연료펌핑능력 저하가 방지되도록 하면서도 연료펌프(6)의 펌핑구동력을 제공하는 직류모터 부(20)를 저속으로 회전시킬 수 있게 되어 연료펌프(6)의 직류모터부(20) 수명이 연장될 수 있게 된다. Therefore, the fuel pump 6 is higher than the rated output voltage applied to the fuel pump driving unit of the conventional LPLI fuel system through the pump unit 30 provided to pressurize and pump the LPG in the fuel tank 1 to the second stage. Even if a low voltage is applied to the DC motor unit 20, an LPG having an appropriate flow rate corresponding to an engine output can be supplied to the injector 2, thereby allowing the LPLI fuel system according to the present invention to provide a fuel pump 6. It is possible to rotate the DC motor unit 20 which provides the pumping driving force of the fuel pump 6 at a low speed while preventing the fuel pumping ability from being lowered, thereby extending the life of the DC motor unit 20 of the fuel pump 6. Will be.

참고로 본 실시예에 있어서 상기 연료펌프(6)는 상기 2개의 임펠러(31,32)를 통해 LPG를 2단으로 펌핑하도록 마련되어 있으나, 본 발명에 따른 연료펌프는 본 실시예와 달리 상기 직류모터부(20)의 구동축(21)에 3개 이상의 임펠러가 설치되도록 하여 3단 이상으로 LPG를 가압펌핑할 수 있도록 마련되어도 무방하다. For reference, in the present embodiment, the fuel pump 6 is provided to pump LPG in two stages through the two impellers 31 and 32, but the fuel pump according to the present invention is different from the present embodiment in the DC motor. Three or more impellers may be installed on the drive shaft 21 of the unit 20 so that the LPG may be pumped in three or more stages.

단 임펠러의 수가 과도하게 증가할 경우에는 상기 구획부재(63)와 같은 부재의 수가 추가되어야 하고 여러 개의 펌프실로 인해 펌프부 내부 유로가 복잡하게 형성될 수도 있음을 감안 했을 때 임펠러는 본 실시예에서와 같이 2개로 마련되는 것이 바람직하다.However, when the number of impellers is excessively increased, the number of members, such as the partition member 63, must be added, and the impeller may be formed in a complicated manner due to several pump chambers. It is preferable to provide two as shown.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 차량용 LPLI 연료시스템은 직류모터부의 구동에 의해 펌핑작용을 수행하는 연료펌프의 펌프부가 직류모터부의 구동축에 2단으로 설치되는 임펠러를 포함하여 구성됨으로써 LPG를 2단으로 가압하여 펌핑할 수 있게 된다.As described in detail above, the vehicle LPLI fuel system according to the present invention comprises a pump unit of the fuel pump for performing the pumping action by driving the DC motor unit comprises an impeller installed in the drive shaft of the DC motor unit in two stages to LPG It can be pumped by pressing in two stages.

따라서 본 발명에 따른 연료펌프는 종래 연료펌프에 인가되던 정격출력전압보다 상대적으로 낮은 전압이 연료펌프의 직류모터부에 인가되도록 하더라도 엔진출력에 맞는 적정유량의 LPG를 펌핑할 수 있게 되어 펌핑능력의 저하가 방지되면서도 종래에 비해 비교적 저속으로 회전할 수 있게 되는 직류모터부의 수명이 연장되도록 하는 이점을 갖는다. Therefore, the fuel pump according to the present invention can pump an appropriate flow rate of LPG suitable for the engine output even if a voltage relatively lower than the rated output voltage applied to the conventional fuel pump is applied to the DC motor part of the fuel pump. It has the advantage of extending the life of the DC motor portion that can be rotated at a relatively low speed compared to the conventional while preventing the deterioration.

Claims (4)

연료탱크의 LPG를 상기 연료탱크 내부에 마련된 연료펌프를 통해 가압하여 액상상태로 유지되도록 한 상태에서 인젝터를 통해 연소실로 직접 분사되도록 하는 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템에 있어서, In the vehicle LPLI (LIQUID PHASE LPG INJECTION) fuel system to press the LPG of the fuel tank through the fuel pump provided inside the fuel tank to be injected directly into the combustion chamber through the injector in a state of maintaining the liquid state, 상기 연료펌프는 구동력을 제공하는 직류모터부와, 상기 직류모터부의 구동력을 전달받아 LPG를 다단으로 가압하여 펌핑하도록 상기 직류모터부의 구동축에 결합된 복수의 임펠러를 포함하는 펌프부를 구비하도록 마련된 것을 특징으로 하는 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템.The fuel pump is provided with a pump unit including a DC motor unit for providing a driving force and a plurality of impellers coupled to the drive shaft of the DC motor unit to pump by pressing the LPG in multiple stages by receiving the driving force of the DC motor unit. LPLI (LIQUID PHASE LPG INJECTION) fuel system for vehicles. 제 1항에 있어서,The method of claim 1, 상기 임펠러의 외주 측에는 원주방향을 따라 복수의 날개가 형성된 날개부가 마련되고,The outer circumferential side of the impeller is provided with a wing portion formed with a plurality of wings in the circumferential direction, 상기 펌프부는 상기 각 임펠러의 외곽 측에 상기 날개부의 형성방향을 따라 “C"자 형상으로 형성되어 상기 날개를 감싸도록 마련된 복수의 펌프실을 더 포함하며, The pump unit further includes a plurality of pump chambers formed on the outer side of each impeller in a "C" shape along the forming direction of the wing unit to surround the wing, 상기 각 펌프실의 끝단은 인접한 직 하류 측 펌프실의 시작단에 연결되도록 마련된 것을 특징으로 하는 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템.An end of each pump chamber is connected to the start of the adjacent downstream downstream pump chamber LPLI (LIQUID PHASE LPG INJECTION) fuel system characterized in that it is provided. 제 2항에 있어서,The method of claim 2, 상기 펌프부는 상기 복수의 임펠러가 내부에 수용되도록 상호 결합되되 각각 흡입구와 토출구가 형성된 흡입케이스 및 토출케이스와, 상기 흡입 및 토출케이스 사이에 개재되는 구획부재를 더 포함하고,The pump unit further includes a suction member and a discharge case which are coupled to each other so that the plurality of impellers are accommodated therein, each of which has a suction port and a discharge port, and a partition member interposed between the suction and discharge cases. 상기 임펠러는 상기 흡입케이스와 구획부재 사이에 수용되는 제1임펠러와, 상기 구획부재와 토출케이스 사이에 수용되는 제2임펠러를 포함하여 한 쌍으로 마련되고,The impeller is provided in a pair including a first impeller accommodated between the suction case and the partition member, and a second impeller accommodated between the partition member and the discharge case. 상기 펌프실은 상기 흡입케이스와 구획부재 사이에 마련되는 제1펌프실과, 상기 구획부재와 토출케이스 사이에 마련되는 제2펌프실을 포함하여 한 쌍으로 마련된 것을 특징으로 하는 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템.The pump chamber is provided in a pair including a first pump chamber provided between the suction case and the partition member, and a second pump chamber provided between the partition member and the discharge case (LIQUID PHASE LPG INJECTION) Fuel system. 제 3항에 있어서,The method of claim 3, 상기 제1펌프실의 시작단은 상기 흡입구에 연결되고, 상기 제2펌프실의 끝단은 상기 토출구에 연결되며, 상기 구획부재에는 상기 제1펌프실의 끝단과 상기 제2펌프실의 시작단을 연결하는 연결홀이 마련된 것을 특징으로 하는 차량용 LPLI(LIQUID PHASE LPG INJECTION) 연료시스템. The first end of the first pump chamber is connected to the suction port, the end of the second pump chamber is connected to the discharge port, the partition member is connected to the end of the first pump chamber and the start end of the second pump chamber LPLI (LIQUID PHASE LPG INJECTION) fuel system for a vehicle, which is provided.
KR1020050080917A 2005-08-31 2005-08-31 Liquid phase lpg injection fuel system for vehicle KR20070025125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020050080917A KR20070025125A (en) 2005-08-31 2005-08-31 Liquid phase lpg injection fuel system for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050080917A KR20070025125A (en) 2005-08-31 2005-08-31 Liquid phase lpg injection fuel system for vehicle

Publications (1)

Publication Number Publication Date
KR20070025125A true KR20070025125A (en) 2007-03-08

Family

ID=38099427

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020050080917A KR20070025125A (en) 2005-08-31 2005-08-31 Liquid phase lpg injection fuel system for vehicle

Country Status (1)

Country Link
KR (1) KR20070025125A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100899612B1 (en) * 2007-10-17 2009-05-27 한국기계연구원 Fuel Pump for LPG Fuel
JP2009121457A (en) * 2007-11-12 2009-06-04 Korea Inst Of Machinery & Materials External inline lpg fuel pump
KR100944422B1 (en) * 2008-06-05 2010-02-25 한국기계연구원 In-line Fuel Pump for elevation lubrication with Thrust bearing
KR20160051402A (en) 2014-11-03 2016-05-11 주식회사 코아비스 Multiple stage fuel pump
FR3107934A1 (en) * 2020-03-04 2021-09-10 Eaton Intelligent Power Limited Single impeller multistage radial regenerative pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100899612B1 (en) * 2007-10-17 2009-05-27 한국기계연구원 Fuel Pump for LPG Fuel
JP2009121457A (en) * 2007-11-12 2009-06-04 Korea Inst Of Machinery & Materials External inline lpg fuel pump
EP2058503A3 (en) * 2007-11-12 2010-11-03 Korea Institute Of Machinery & Materials External inline LPG fuel pump
KR100944422B1 (en) * 2008-06-05 2010-02-25 한국기계연구원 In-line Fuel Pump for elevation lubrication with Thrust bearing
KR20160051402A (en) 2014-11-03 2016-05-11 주식회사 코아비스 Multiple stage fuel pump
US10119509B2 (en) 2014-11-03 2018-11-06 Coavis Multiple stage fuel pump
FR3107934A1 (en) * 2020-03-04 2021-09-10 Eaton Intelligent Power Limited Single impeller multistage radial regenerative pump
US11821429B2 (en) 2020-03-04 2023-11-21 Eaton Intelligent Power Limited Single wheel multi-stage radially-layered regenerative pump

Similar Documents

Publication Publication Date Title
US6739305B2 (en) Oil pump for internal combustion engine and method of operating the same
US4336002A (en) Two stage pump having an electromotor device
US6758656B2 (en) Multi-stage internal gear/turbine fuel pump
US20060024176A1 (en) Electric pump and modularized fuel supply system with such electric pump
EP1705378A2 (en) Electric pump with pressure control
KR20070025125A (en) Liquid phase lpg injection fuel system for vehicle
JPH04214995A (en) Fuel pump for vehicle
JP2011190763A (en) Rotary pump
US20180216614A1 (en) Screw pump
JP2002155824A (en) Fuel supply system for internal combustion engine
US5340293A (en) Gear-type pump having pressure balanced support
KR100407501B1 (en) lubricating device of fuel pump in the LPG vehicles
JPS59141762A (en) Fuel pump
US20040247467A1 (en) Westoco type fuel pump
JP2007132274A (en) Scroll compressor
US4013053A (en) Fuel pump
KR20070094938A (en) Fuel pump
US6694951B2 (en) Fuel supply system for an internal combustion engine with a hybrid-drive fuel pump
KR100639892B1 (en) Liquid phase lpg injection fuel system for vehicle
JP3102522B2 (en) Gear pump
US5571003A (en) Fuel pump with and method to modulate vapor purge port pressure pulses
JP2007177702A (en) Fuel pump module
US6729307B2 (en) Bypass/leakage cooling of electric pump
JP2007263032A (en) Fuel supply device
KR100666336B1 (en) Liquid phase lpg injection fuel system for vehicle

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application