Multi-fuel system applied to general gasoline engine

Abstract

The utility model relates to the technical field of fuel systems, in particular to a multi-fuel system applied to a general gasoline engine, which comprises a fuel gas control part, a fuel oil control part and the general gasoline engine, the fuel gas control part comprises a CNG gas cylinder, an LPG gas cylinder, a first-stage pressure reducing valve I, a first-stage pressure reducing valve II and a fuel gas control piece, the two sides of the first-stage pressure reducing valve I are connected with the CNG cylinder and the first-stage pressure reducing valve II respectively, the LPG is connected with the first-stage pressure reducing valve II, and the first-stage pressure reducing valve II is further connected with the fuel gas control part; the fuel oil control part comprises a fuel oil tank and a fuel oil control piece, the fuel oil tank is connected with the fuel oil control piece, the fuel oil control piece is connected with the fuel gas control piece and the general gasoline engine at the same time, and gas can enter the general gasoline engine from the fuel gas control piece through the fuel oil control piece. The gasoline engine has the effect that gasoline and gas fuel are applied to the general gasoline engine at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of fuel systems, and in particular to a multi-fuel system used in general engines. Background Art

[0002] General generator sets, referred to as general generators. At present, most general generators still use gasoline as the fuel for engine operation. The cost of using a single fuel increases with the increase in gasoline prices. At the same time, the exhaust emissions after gasoline combustion produce carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxides (NOx) and carbon dioxide (CO2), which are harmful to the environment and the human body. Therefore, the use of clean energy is a top priority in today's society.

[0003] For the above problems, natural gas and liquefied petroleum gas are more economical and environmentally friendly fuel types. Gas fuel can be better mixed with air, providing extremely favorable conditions for combustion, making the fuel burn more fully, and the emission of CO and HC is greatly reduced compared to gasoline. Therefore, how to use gasoline and gas fuel in general engines at the same time has become an urgent problem to be solved. Utility Model Content

[0004] In order to use gasoline and gas fuel in a general engine at the same time, the present application provides a multi-fuel system for a general engine.

[0005] The present application provides a multi-fuel system for general use, which adopts the following technical solutions:

[0006] A multi-fuel system for a general machine, comprising a gas control unit, a fuel control unit and a general machine, wherein the gas control unit comprises a CNG gas cylinder, an LPG gas cylinder, a first-stage pressure reducing valve No. 1, a first-stage pressure reducing valve No. 2 and a gas control unit, wherein both sides of the first-stage pressure reducing valve No. 1 are respectively connected to the CNG gas cylinder and the first-stage pressure reducing valve No. 2, the LPG is connected to the first-stage pressure reducing valve No. 2, and the first-stage pressure reducing valve No. 2 is also connected to the gas control unit;

[0007] The fuel control unit includes a fuel tank and a fuel control component. The fuel tank is connected to the fuel control component. The fuel control component is connected to the gas control component and the general machine at the same time. Gas can enter the general machine from the gas control component through the fuel control component.

[0008] By adopting the above technical solution:

[0009] When using gasoline as fuel:

[0010] Start the general engine, and negative pressure is generated in the intake duct of the general engine. The fuel enters the fuel control component through the fuel tank, and the fresh air and gasoline are mixed into the general engine and ignite and burn, and the general engine runs normally.

[0011] When using LPG as fuel:

[0012] Turn on the LPG cylinder switch, the LPG gas is reduced in pressure by the first-stage pressure reducing valve No. 2, and the gas control component starts working. At this time, the fuel control component is in a closed state. Start the engine, and the intake duct of the engine generates negative pressure. The LPG gas passes through the gas control component and the fuel control component in turn. Fresh air enters and is fully mixed with the LPG gas. It enters the engine and ignites and burns, and the engine runs normally.

[0013] When using CNG as fuel:

[0014] Turn on the CNG cylinder switch, and the CNG gas will be reduced in pressure by the first-stage pressure reducing valve No. 1 and the second-stage pressure reducing valve in turn, and the gas control component will start working. At this time, the fuel control component is in a closed state. Start the open engine, and the intake duct of the open engine will generate negative pressure. The LPG gas will pass through the gas control component and the fuel control component in turn, and fresh air will enter and be fully mixed with the LPG gas to enter the open engine for ignition and combustion, and the engine will operate normally.

[0015] It can realize the use of gasoline and gas fuel in the general engine at the same time. Different fuels can be selected according to the fuel reserve situation, which is economical and environmentally friendly.

[0016] Optionally, the gas control unit also includes pipeline natural gas, and the pipeline natural gas is connected between the first-level pressure reducing valve No. 2 and the gas control component.

[0017] By adopting the above technical solution, in addition to LPG and CNG, two types of liquefied petroleum gases can be selected, natural gas can also be used, increasing the types of gas fuels and further improving the diversity of fuel options, making it more economical and environmentally friendly.

[0018] Optionally, the gas control component includes a secondary pressure reducing valve and a gas cut-off valve arranged on the secondary pressure reducing valve, and the fuel control component includes a solenoid valve and a carburetor arranged on the solenoid valve, and the secondary pressure reducing valve is connected to the solenoid valve.

[0019] By adopting the above technical solution:

[0020] When using gasoline as fuel:

[0021] Start the general engine, and negative pressure is generated in the intake duct of the general engine. The fuel enters the carburetor through the fuel tank and is atomized. Fresh air enters and mixes with the atomized gasoline and enters the general engine to ignite and burn, and the engine operates normally.

[0022] When using LPG as fuel:

[0023] Turn on the LPG cylinder switch, the gas is reduced in pressure through the first-stage pressure reducing valve No. 2, the gas shut-off valve is open, and the gas enters the second-stage pressure reducing valve, and the carburetor and solenoid valve are in a blocked state. Start the engine, and the intake duct of the engine generates negative pressure. LPG gas enters the carburetor mixing chamber through the second-stage pressure reducing valve, and fresh air enters and is fully mixed with LPG gas to enter the engine for ignition and combustion, and the engine operates normally.

[0024] When using CNG as fuel:

[0025] Turn on the CNG cylinder switch, the gas is first reduced in pressure through the first-stage pressure reducing valve No. 1, and then reduced in pressure through the first-stage pressure reducing valve No. 2, the gas shut-off valve is open, allowing the gas to enter the second-stage pressure reducing valve, and the carburetor and solenoid valve are in a blocked state. Start the engine, the intake duct of the engine generates negative pressure, the CNG gas enters the carburetor mixing chamber through the second-stage pressure reducing valve, the fresh air enters and is fully mixed with the CNG gas and enters the engine to ignite and burn, and the engine operates normally.

[0026] Optionally, the gas control component includes a gas control valve and a pressure sensor arranged on the gas control valve, and the fuel control component includes a valve body, an electronic controller and a fuel nozzle, the electronic controller is electrically connected to the pressure sensor, the pressure sensor is used to detect the gas pressure and transmit the gas pressure signal to the electronic controller, and the electronic controller is used to automatically control the opening and closing of the valve body according to the gas pressure signal.

[0027] By adopting the above technical solution:

[0028] When using gasoline as fuel:

[0029] The electronic controller executes the fuel combustion command and starts the engine. The fuel is sprayed into the intake duct of the engine through the fuel tank and the fuel nozzle. Negative pressure is generated in the intake duct, and fresh air enters and mixes with the atomized gasoline into the engine to ignite and burn, and the engine runs normally.

[0030] When using LPG as fuel:

[0031] The electronic controller executes the LPG combustion instruction, turns on the LPG cylinder switch, and the gas passes through the first-level pressure reducing valve and the second-level pressure reducing valve to reach the gas control valve. The gas control valve opens according to the instruction of the electronic controller to allow LPG to enter the mixing chamber of the valve body, and fresh air enters and is fully mixed with the LPG gas to enter the machine for ignition and combustion, and the machine operates normally.

[0032] When using CNG as fuel:

[0033] The electronic controller executes the CNG combustion instruction, turns on the CNG cylinder switch, and the gas passes through the first-level pressure reducing valve No. 2 to reduce the pressure and reach the gas control valve. The gas control valve opens according to the instruction of the electronic controller to allow NG to enter the mixing chamber of the valve body, and fresh air enters and is fully mixed with the CNG gas to enter the machine for ignition and combustion, and the machine operates normally.

[0034] Optionally, the general machine is an engine, which includes a body and an air filter arranged on the body, and air enters the body through the air filter.

[0035] By adopting the above technical solution, fresh air enters the engine after being filtered by the air filter, reducing impurities entering the engine body and helping to increase the service life of the engine.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. The system of the present application adds a gas fuel combustion system on the basis of the existing oil-fired general machine. The systems operate independently of each other. The general machine equipped with this combustion system has the ability to use three fuels, namely liquefied petroleum gas, natural gas and gasoline. Different fuels can be selected for use according to the actual fuel reserve situation, which is economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of a multi-fuel system used in a general machine in Example 1 of the present application.

[0039] Figure 2 A schematic diagram of the overall structure of a multi-fuel system used in a general purpose machine in Example 2 of the present application.

[0040] Explanation of the reference numerals in the accompanying drawings: 1. gas control unit; 11. CNG gas cylinder; 12. LPG gas cylinder; 13. First-stage pressure reducing valve No. 1; 14. First-stage pressure reducing valve No. 2; 15. Pipeline natural gas; 2. Fuel control unit; 21. Fuel tank; 3. Engine; 31. Engine body; 32. Air filter; 4. Second-stage pressure reducing valve; 41. Gas shut-off valve; 5. Solenoid valve; 51. Carburetor; 6. Gas control valve; 61. Pressure sensor; 7. Valve body; 71. Electronic controller; 72. Fuel nozzle. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-2 This application is described in further detail.

[0042] Example 1

[0043] The present application embodiment discloses a multi-fuel system for general use. Figure 1The multi-fuel system used in the general machine includes a gas control unit 1, a fuel control unit 2 and a general machine. The gas control unit 1 includes a CNG cylinder 11, an LPG cylinder 12, a first-stage pressure reducing valve No. 13, a first-stage pressure reducing valve No. 2 14 and a gas control unit. The first-stage pressure reducing valve No. 13 is connected to the CNG cylinder 11 and the first-stage pressure reducing valve No. 2 14 on both sides, and the LPG is connected to the first-stage pressure reducing valve No. 2 14. The first-stage pressure reducing valve No. 2 14 is also connected to the gas control unit. The fuel control unit 2 includes a fuel tank 21 and a fuel control unit. The fuel tank 21 is connected to the fuel control unit. The fuel control unit is connected to the gas control unit and the general machine at the same time. The gas can enter the general machine from the gas control unit through the fuel control unit.

[0044] The gas control component includes a secondary pressure reducing valve 4 and a gas cut-off valve 41 arranged on the secondary pressure reducing valve 4 , and the fuel control component includes a solenoid valve 5 and a carburetor 51 arranged on the solenoid valve 5 . The secondary pressure reducing valve 4 is connected to the solenoid valve 5 .

[0045] When using gasoline as fuel:

[0046] When the engine is started, negative pressure is generated in the intake passage of the engine, fuel enters the carburetor 51 through the fuel tank 21 and is atomized, fresh air enters and mixes with the atomized gasoline and enters the engine to ignite and burn, and the engine 3 runs normally.

[0047] When using LPG as fuel:

[0048] The switch of LPG cylinder 12 is turned on, and the gas is reduced in pressure through the first-stage pressure reducing valve No. 2 14. The gas shut-off valve 41 is opened, and the gas enters the second-stage pressure reducing valve 4. The carburetor 51 and the solenoid valve 5 are in a blocked state. The engine is started, and the intake passage of the engine generates negative pressure. The LPG gas enters the mixing chamber of the carburetor 51 through the second-stage pressure reducing valve 4. Fresh air enters and is fully mixed with the LPG gas and enters the engine to ignite and burn. The engine 3 operates normally.

[0049] When using CNG as fuel:

[0050] The CNG cylinder 11 is switched on, and the gas is first decompressed through the first-stage pressure reducing valve No. 13, and then decompressed through the first-stage pressure reducing valve No. 2 14. The gas cut-off valve 41 is opened, allowing the gas to enter the second-stage pressure reducing valve 4, and the carburetor 51 and the solenoid valve 5 are in a blocked state. The engine is started, and the intake duct of the engine generates negative pressure. The CNG gas enters the mixing chamber of the carburetor 51 through the second-stage pressure reducing valve 4, and the fresh air enters and is fully mixed with the CNG gas and enters the engine to ignite and burn, and the engine 3 operates normally.

[0051] The general machine is an engine 3, which includes a body 31 and an air filter 32 arranged on the body 31, and air enters the body 31 through the air filter 32. Fresh air enters the engine 3 after being filtered by the air filter 32, reducing impurities entering the body 31, which helps to increase the service life of the engine 3. The gas control unit 1 also includes a pipeline natural gas 15, which is connected between the first-level pressure reducing valve No. 2 14 and the gas control component. In addition to the two liquefied petroleum gases LPG and CNG, natural gas can also be used to increase the types of gas fuels and further improve the diversity of fuel selection, thereby being more economical and environmentally friendly.

[0052] Example 2

[0053] The difference between the present embodiment and embodiment 1 is that, Figure 2 The gas control component includes a gas control valve 6 and a pressure sensor 61 arranged on the gas control valve 6. The fuel control component includes a valve body 7, an electronic controller 71 and a fuel nozzle 72. The electronic controller 71 is electrically connected to the pressure sensor 61. The pressure sensor 61 is used to detect the gas pressure and transmit the gas pressure signal to the electronic controller 71. The electronic controller 71 is used to automatically control the opening and closing of the valve body 7 according to the gas pressure signal.

[0054] When using gasoline as fuel:

[0055] The electronic controller 71 executes the fuel combustion instruction and starts the engine. The fuel is sprayed into the intake duct of the engine through the fuel tank 21 by the fuel nozzle 72. Negative pressure is generated in the intake duct, and fresh air enters and mixes with the atomized gasoline and enters the engine 3 to ignite and burn. The engine 3 runs normally.

[0056] When using LPG as fuel:

[0057] The electronic controller 71 executes the LPG combustion instruction, turns on the switch of the LPG cylinder 12, and the gas is reduced in pressure through the first-level pressure reducing valve No. 2 14 to reach the gas control valve 6. The gas control valve 6 opens according to the instruction of the electronic controller 71 to allow LPG to enter the mixing chamber of the valve body 7, and fresh air enters and is fully mixed with the LPG gas to enter the machine for ignition and combustion, and the machine operates normally.

[0058] When using CNG as fuel:

[0059] The electronic controller 71 executes the CNG combustion instruction, turns on the switch of the CNG cylinder 11, and the gas is reduced in pressure through the first-level pressure reducing valve No. 2 14 to reach the gas control valve 6. The gas control valve 6 opens according to the instruction of the electronic controller 71 to allow NG to enter the mixing chamber of the valve body 7, and fresh air enters and is fully mixed with the CNG gas to enter the machine for ignition and combustion, and the machine operates normally.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-fuel system for a general purpose machine, characterized in that: The invention comprises a gas control unit (1), a fuel control unit (2) and a general machine, wherein the gas control unit (1) comprises a CNG gas cylinder (11), an LPG gas cylinder (12), a first-stage pressure reducing valve (13), a second-stage pressure reducing valve (14) and a gas control unit, wherein two sides of the first-stage pressure reducing valve (13) are respectively connected to the CNG gas cylinder (11) and the second-stage pressure reducing valve (14), the LPG is connected to the second-stage pressure reducing valve (14), and the second-stage pressure reducing valve (14) is also connected to the gas control unit; The fuel control unit (2) comprises a fuel tank (21) and a fuel control component, wherein the fuel tank (21) is connected to the fuel control component, and the fuel control component is simultaneously connected to the gas control component and the general machine, and gas can enter the general machine from the gas control component through the fuel control component.

2. A multi-fuel system for general use according to claim 1, characterized in that: The gas control unit (1) further comprises pipeline natural gas (15), wherein the pipeline natural gas (15) is connected between the first-stage pressure reducing valve No. 2 (14) and the gas control component.

3. A multi-fuel system for general use according to claim 1 or 2, characterized in that: The gas control component comprises a secondary pressure reducing valve (4) and a gas cut-off valve (41) arranged on the secondary pressure reducing valve (4); the fuel control component comprises a solenoid valve (5) and a carburetor (51) arranged on the solenoid valve (5); and the secondary pressure reducing valve (4) is connected to the solenoid valve (5).

4. A multi-fuel system for general use according to claim 1 or 2, characterized in that: The gas control component comprises a gas control valve (6) and a pressure sensor (61) arranged on the gas control valve (6); the fuel control component comprises a valve body (7), an electronic controller (71) and a fuel nozzle (72); the electronic controller (71) is electrically connected to the pressure sensor (61); the pressure sensor (61) is used to detect the gas pressure and transmit the gas pressure signal to the electronic controller (71); the electronic controller (71) is used to automatically control the opening and closing of the valve body (7) according to the gas pressure signal.

5. A multi-fuel system for general use according to claim 1 or 2, characterized in that: The general machine is an engine (3), and the engine (3) comprises a body (31) and an air filter (32) arranged on the body (31), and air enters the body (31) through the air filter (32).

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