Three-fuel system

Abstract

The utility model discloses a three-fuel system which comprises a gas fuel source and a liquid fuel source, the gas outlet end of the gas fuel source is sequentially connected with a first-stage pressure reducing valve and a second-stage pressure reducing valve, the gas outlet end of the second-stage pressure reducing valve is connected with a first gas pipe and a second gas pipe, and the gas outlet end of the first gas pipe is connected with a carburetor. The gas outlet end of the second gas pipe is connected with a pressure switch, the oil outlet end of the liquid fuel source is connected to the oil inlet end of a carburetor, and an ignition coil is arranged at the outlet end of the carburetor. The pressure switch is electrically connected to the control end of the liquid fuel source and used for controlling opening and closing of the gas fuel source and the liquid fuel source. According to the utility model, the switching efficiency and the utilization efficiency of each fuel can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel systems, and in particular to a three-fuel system. Background Technology

[0002] A three-fuel system is a system capable of using three different fuels and providing stable switching. Specifically, a three-fuel system typically includes a carburetor and a pressure reducing valve assembly. The carburetor is mounted on the engine block and has a gas fuel inlet, a liquid fuel inlet, and a switch for controlling the gas-liquid fuel switching. The pressure reducing valve assembly is used to connect to the gas fuel supply device and delivers the high-pressure gas to the carburetor diaphragm chamber after reducing the pressure through a primary pressure reducing valve and a secondary pressure reducing valve, ensuring the stability of fuel switching.

[0003] Currently, three-fuel systems on the market require manual switching between fuels, which is inconvenient to use. Furthermore, because natural gas (NG) fuel burns slowly, the same ignition advance angle is used when NG is used as liquefied petroleum gas (LPG), which leads to low fuel utilization efficiency. Utility Model Content

[0004] The technical problem to be solved by this invention is to provide a three-fuel system that can improve the switching efficiency and utilization efficiency of each fuel.

[0005] To solve the above-mentioned technical problems, the three-fuel system provided by this utility model adopts the following technical solution:

[0006] A three-fuel system includes a gaseous fuel source and a liquid fuel source. The outlet of the gaseous fuel source is sequentially connected to a primary pressure reducing valve and a secondary pressure reducing valve. The outlet of the secondary pressure reducing valve is connected to a first gas pipe and a second gas pipe. The outlet of the first gas pipe is connected to a carburetor, and the outlet of the second gas pipe is connected to a pressure switch. The outlet of the liquid fuel source is connected to the fuel inlet of the carburetor, and an ignition coil is installed at the outlet of the carburetor. The pressure switch is electrically connected to the control terminal of the liquid fuel source and is used to control the opening and closing of the gaseous fuel source and the liquid fuel source.

[0007] By adopting the above technical solution, when gaseous fuel is turned on, the fuel is depressurized by the primary pressure reducing valve to the pressure required by the generator, and then delivered to the secondary pressure reducing valve and pressure switch. Driven by the gaseous fuel pressure, the pressure switch shuts off the liquid fuel source connected to the carburetor. The secondary pressure reducing valve delivers gaseous fuel to the carburetor according to the generator's demand, where it mixes with air and finally enters the combustion chamber to perform work. When the gaseous fuel source is turned off, the pressure switch, due to lack of pressure, opens the connection between the carburetor and the liquid fuel source, and the carburetor uses liquid fuel for fuel mixing to power the generator. Through the first gas pipe and the second pressure switch, the automatic switching function between gaseous and liquid fuel operation is achieved, improving the ease of product operation.

[0008] Optionally, a switching switch is also included, which is electrically connected to the control terminal of the ignition coil and is used to control the change of the ignition advance angle of the ignition coil.

[0009] By adopting the above technical solution, when the gaseous fuel is natural gas or liquefied petroleum gas (LPG), the customer can select the fuel according to the actual fuel used by switching the switch. When natural gas or LPG is selected as the fuel, the switch can drive the ignition coil to change to the corresponding ignition advance angle, so as to improve the utilization efficiency of different fuels and make the three-fuel system more practical and applicable.

[0010] Optionally, the outlet end of the carburetor is connected to a generator, the ignition coil is located in the combustion chamber of the generator, and the switching switch is located on the control panel of the invention.

[0011] Optionally, the secondary pressure reducing valve is equipped with a ventilation volume control system, and the switching switch is electrically connected to the control terminal of the ventilation volume control system.

[0012] By adopting the above technical solution, the required gas flow rate is different when using natural gas or liquefied petroleum gas. When natural gas or liquefied petroleum gas is selected by switching the switch, the switch drives the gas flow rate control system to adjust the gas flow rate, so as to better adapt to the combustion conditions of different fuels and further improve the fuel utilization efficiency.

[0013] Optionally, the ventilation volume control system includes a first chamber and a second chamber disposed in the secondary pressure reducing valve. The first chamber has an air inlet, which is connected to the air outlet of the primary pressure reducing valve via a pipeline. A first air outlet and a second air outlet are disposed on the partition plate between the first chamber and the second chamber. The second chamber has a third air outlet, which is connected to the first air pipe and the second air pipe. The secondary pressure reducing valve is provided with a second solenoid valve, which is used to control the opening and closing of the first air outlet, and the second air outlet is normally open.

[0014] By adopting the above technical solution, when natural gas or liquefied gas is selected by switching the switch, the first gas outlet is opened or closed by operating the second solenoid valve. The second gas outlet is normally open, and the gas flow rate of the third gas outlet is controlled by opening and closing the first gas outlet.

[0015] Optionally, the switching switch is electrically connected to the control terminal of the second solenoid valve.

[0016] By adopting the above technical solution, when natural gas or liquefied gas is selected by switching on the switch, the switch can simultaneously transmit a signal to the second solenoid valve, driving the second solenoid valve to open or close the first gas outlet, thereby improving operational efficiency and accuracy.

[0017] Optionally, the gaseous fuel source is a gas cylinder equipped with a valve.

[0018] By adopting the above technical solution, the opening and closing of the gas tank valve can be controlled to open or close the gas fuel source, which is convenient and easy.

[0019] Optionally, a first solenoid valve is provided between the liquid fuel source and the carburetor, and the pressure switch is electrically connected to the first solenoid valve.

[0020] By adopting the above technical solution, the pressure switch drives the first solenoid valve to close or open the connecting pipeline between the liquid fuel source and the carburetor.

[0021] In summary, this utility model has at least one of the following beneficial technical effects:

[0022] 1. When gaseous fuel is turned on, the fuel is reduced in pressure by the primary pressure reducing valve to the pressure required by the generator, and then delivered to the secondary pressure reducing valve and pressure switch. Driven by the gaseous fuel pressure, the pressure switch closes the liquid fuel source connected to the carburetor. The secondary pressure reducing valve delivers the gaseous fuel to the carburetor according to the generator's demand to mix with air, and finally enters the combustion chamber to perform work. When the gaseous fuel source is turned off, the pressure switch opens the connection between the carburetor and the liquid fuel source due to lack of pressure, and the carburetor uses liquid fuel to mix the fuel for generator operation. Through the first exhaust pipe and the second pressure switch, the automatic switching function between gaseous and liquid fuel operation is realized, improving the convenience of product operation.

[0023] 2. When the gaseous fuel is natural gas or liquefied petroleum gas (LPG), the customer selects the appropriate fuel using a switch. When natural gas or LPG is selected as the fuel, the switch will simultaneously change the ignition advance angle to improve the combustion efficiency of the fuel, thereby increasing the utilization efficiency of the fuel and making the three-fuel system more practical and applicable.

[0024] 3. The required gas flow rate differs when using natural gas or liquefied petroleum gas (LPG). After selecting natural gas or LPG via a switch, the switch drives the gas flow rate control system to adjust the gas flow rate to better adapt to the combustion conditions of different fuels and further improve fuel utilization efficiency. Attached Figure Description

[0025] Figure 1 This utility model is a schematic diagram illustrating the overall structure of a three-fuel system.

[0026] Figure 2 This is a schematic diagram showing the connection of the liquid fuel source, the two-stage pressure reducing valve, the pressure switch, and the carburetor in this utility model.

[0027] Figure 3 This is a schematic diagram showing the connection of the switching switch, the second solenoid valve, and the ignition coil in this utility model.

[0028] Figure 4 This is a schematic diagram of the structure of the two-stage pressure reducing valve and the second solenoid valve in this utility model.

[0029] Explanation of reference numerals in the attached diagram: 1. Gas fuel source; 2. Liquid fuel source; 3. Primary pressure reducing valve; 4. Secondary pressure reducing valve; 5. First gas pipe; 6. Second gas pipe; 7. Pressure switch; 8. Carburetor; 9. Ignition coil; 10. Switch; 11. Generator; 12. Air inlet; 13. First air outlet; 14. Second air outlet; 15. Third air outlet; 16. Second solenoid valve; 17. Frame. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0031] This utility model discloses a three-fuel system. (Refer to...) Figure 1 The three-fuel system includes a gaseous fuel source 1, a liquid fuel source 2, a generator 11, a carburetor 8, and a frame 17. The liquid fuel source 2, the carburetor 8, and the generator 11 are all fixedly mounted on the frame 17. The liquid fuel source 2 is a fuel tank and is connected to the fuel inlet of the carburetor 8 via a connecting pipe. A first solenoid valve is installed on the connecting pipe, which is used to control the opening and closing of the connecting pipe between the liquid fuel source 2 and the carburetor 8.

[0032] Reference Figure 1 and Figure 2The gas fuel source 1 is a gas cylinder equipped with a valve. Opening or closing the valve of the gas cylinder controls the start and stop of the gas fuel source 1, which is convenient and easy. The outlet end of the gas fuel source 1 is connected to a first gas pipe 5 and a second gas pipe 6. The outlet end of the first gas pipe 5 is connected to the inlet end of the carburetor 8, and the outlet end of the second gas pipe 6 is connected to a pressure switch 7, which is electrically connected to the control end of the first solenoid valve. The outlet end of the carburetor 8 is connected to an output pipe, which is connected to the combustion chamber of the generator 11. An ignition coil 9 is installed in the combustion chamber of the generator 11, and the ignition coil 9 is located at the outlet end of the output pipe.

[0033] When gaseous fuel is turned on, the fuel is depressurized by the primary pressure reducing valve 3 to reach the pressure required by the generator 11, and then delivered to the secondary pressure reducing valve 4 and the pressure switch 7. Driven by the gaseous fuel pressure, the pressure switch 7 actuates the first solenoid valve to close the connection between the liquid fuel source 2 and the carburetor 8. The secondary pressure reducing valve 4 then delivers the gaseous fuel to the carburetor 8 according to the generator 11's demand, where it mixes with air before entering the combustion chamber to perform work. When the gaseous fuel source 1 is turned off, the pressure switch 7, lacking pressure, opens the connection between the carburetor 8 and the liquid fuel source 2, allowing the carburetor 8 to use liquid fuel for fuel mixing to power the generator 11. This automatic switching between gaseous and liquid fuel operation via the first gas pipe 5 and the second pressure switch 7 improves the ease of operation.

[0034] Reference Figure 3 Because natural gas burns slowly, using the same ignition advance angle when using natural gas and liquefied petroleum gas will also result in low fuel efficiency. The control panel of generator 11 is equipped with a switch 10, which is connected to the control terminal of ignition coil 9 via a wire.

[0035] When the gaseous fuel is natural gas or liquefied petroleum gas (LPG), the customer selects the appropriate fuel using the switch 10. When natural gas or LPG is selected as the fuel, the switch 10 drives the ignition coil 9 to change to the corresponding ignition advance angle to improve the utilization efficiency of different fuels, making the three-fuel system more practical and applicable.

[0036] Reference Figure 4The required gas flow rate differs depending on whether natural gas or liquefied petroleum gas (LPG) is used. To further improve fuel utilization efficiency, the secondary pressure reducing valve 4 is equipped with a gas flow rate control system. This system includes a first chamber and a second chamber, which are independent of each other. The first chamber has an inlet 12, which is connected to the outlet of the primary pressure reducing valve 3 via a pipeline. A first outlet 13 and a second outlet 14 are located on the partition between the first and second chambers, connecting both chambers. The second chamber has a third outlet 15, which is connected to the first gas pipe 5 and the second gas pipe 6. The secondary pressure reducing valve 4 is equipped with a second solenoid valve 16, which controls the opening and closing of the first outlet 13. The second outlet 14 is normally open. A switch 10 is connected to the control terminal of the second solenoid valve 16 via a wire.

[0037] When natural gas or liquefied petroleum gas (LPG) is selected via the switch 10, the switch 10 simultaneously transmits a signal to the second solenoid valve 16, driving the second solenoid valve 16 to open or close the first gas outlet 13. The second gas outlet 14 is normally open. The opening and closing of the first gas outlet 13 controls the gas flow rate of the third gas outlet 15. The switch 10 drives the gas flow rate regulation system to adjust the gas flow rate to better adapt to the combustion conditions of different fuels and further improve fuel utilization efficiency.

[0038] The implementation principle of a three-fuel system according to this utility model embodiment is as follows: When gaseous fuel is turned on, the fuel is depressurized through the primary pressure reducing valve 3 to reach the pressure required by the generator 11, and then delivered to the secondary pressure reducing valve 4 and the pressure switch 7. Driven by the gaseous fuel pressure, the pressure switch 7 drives the first solenoid valve to close the connection pipeline between the liquid fuel source 2 and the carburetor 8. The secondary pressure reducing valve 4 delivers the gaseous fuel to the carburetor 8 according to the demand of the generator 11 to mix with air, and finally enters the combustion chamber to do power. When the gaseous fuel source 1 is turned off, the pressure switch 7 opens the connection pipeline between the carburetor 8 and the liquid fuel source 2 due to the lack of pressure, and the carburetor 8 uses liquid fuel to mix the fuel for the generator 11 to run.

[0039] When the gaseous fuel is natural gas or liquefied petroleum gas (LPG), the selection can be made via the switch 10 according to the actual fuel used. The switch 10 drives the ignition coil 9 to change to the corresponding ignition advance angle to improve the combustion efficiency of different fuels. After selecting natural gas or LPG via the switch 10, the switch 10 simultaneously transmits a signal to the second solenoid valve 16, driving the second solenoid valve 16 to open or close the first gas outlet 13. The second gas outlet 14 is normally open. The opening and closing of the first gas outlet 13 controls the airflow of the third gas outlet 15. The switch 10 drives the airflow regulation system to adjust the airflow to better adapt to the combustion conditions of different fuels.

[0040] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A three-fuel system, characterized in that: The system includes a gaseous fuel source (1) and a liquid fuel source (2). The gaseous fuel source (1) is connected to a first-stage pressure reducing valve (3) and a second-stage pressure reducing valve (4) in sequence at its outlet. The outlet of the second-stage pressure reducing valve (4) is connected to a first gas pipe (5) and a second gas pipe (6). The outlet of the first gas pipe (5) is connected to a carburetor (8), and the outlet of the second gas pipe (6) is connected to a pressure switch (7). The oil outlet of the liquid fuel source (2) is connected to the oil inlet of the carburetor (8). An ignition coil (9) is provided at the outlet of the carburetor (8). The pressure switch (7) is electrically connected to the control terminal of the liquid fuel source (2) and is used to control the opening and closing of the gaseous fuel source (1) and the liquid fuel source (2).

2. A three-fuel system according to claim 1, characterized in that: It also includes a switching switch (10), which is electrically connected to the control terminal of the ignition coil (9) and is used to control the change of the ignition advance angle of the ignition coil (9).

3. The three-fuel system according to claim 2 is characterized in that: The outlet end of the carburetor (8) is connected to the generator (11), the ignition coil (9) is located in the combustion chamber of the generator (11), and the switch (10) is located on the operation panel of the generator (11).

4. A three-fuel system according to claim 2, characterized in that: The secondary pressure reducing valve (4) is equipped with a ventilation volume control system, and the switching switch (10) is electrically connected to the control terminal of the ventilation volume control system.

5. A three-fuel system according to claim 4, characterized in that: The ventilation volume control system includes a first chamber and a second chamber disposed in the secondary pressure reducing valve (4). The first chamber is provided with an air inlet (12), which is connected to the air outlet of the primary pressure reducing valve (3) through a pipeline. The partition plate of the first chamber and the second chamber is provided with a first air outlet (13) and a second air outlet (14). The second chamber is provided with a third air outlet (15), which is connected to the first air pipe (5) and the second air pipe (6). The secondary pressure reducing valve (4) is provided with a second solenoid valve (16), which is used to control the opening and closing of the first air outlet (13). The second air outlet (14) is normally open.

6. A three-fuel system according to claim 5, characterized in that: The switching switch (10) is electrically connected to the control terminal of the second solenoid valve (16).

7. A three-fuel system according to claim 1, characterized in that: The gas fuel source (1) is a gas cylinder equipped with a valve.

8. A three-fuel system according to claim 1, characterized in that: A first solenoid valve is provided between the liquid fuel source (2) and the carburetor (8), and the pressure switch (7) is electrically connected to the first solenoid valve.

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