Novel fuel evaporation system

Abstract

The invention relates to the technical field of engine fuel oil, in particular to a novel fuel oil evaporation system which comprises an engine, an air inlet channel, a fuel oil tank and a carbon tank, a fuel oil pump and a dumping valve are arranged on the fuel oil tank, an adsorption opening and a desorption opening are formed in the carbon tank, the fuel oil pump is connected with the air inlet channel, and the dumping valve is connected with the adsorption opening. A one-way valve is arranged between the air inlet channel and the carbon tank, an inlet of the one-way valve is connected with the adsorption port, and an outlet of the one-way valve is connected with the air inlet channel; a two-way valve is arranged between the fuel tank and the carbon tank, an inlet of the two-way valve is connected with the dumping valve, and an outlet of the two-way valve is connected with the adsorption opening. The gasoline engine has the advantages that waste and pollution caused by direct emission of fuel steam into air are reduced, cost is reduced, the structure is simplified, and the gasoline engine is suitable for a general gasoline generator set.

Description

Technical Field

[0001] The present application relates to the technical field of engine fuel, and in particular to a novel fuel evaporation system. Background Art

[0002] Cars are equipped with gasoline generators. To meet environmental protection and economic requirements, existing gasoline generators usually add a carbon canister between the fuel tank and the engine. The carbon canister absorbs and stores gasoline vapor evaporated from the fuel tank to prevent the gasoline vapor from volatilizing directly into the air. The desorption port of the carbon canister is connected to the air filter. However, some fuel vapor that is not absorbed by the carbon canister escapes into the air filter through the desorption port and is directly discharged into the air, causing waste and pollution. To prevent escape, cars use an electronic control valve structure, but this structure is costly and complex, and is not suitable for general gasoline generators. Summary of the invention

[0003] In order to reduce the waste and pollution caused by direct emission of fuel vapor into the air, while reducing costs and simplifying the structure, the present application provides a new type of fuel evaporation system suitable for general gasoline generator sets.

[0004] A novel fuel evaporation system provided in this application adopts the following technical solution: A novel fuel evaporation system comprises an engine, an air intake duct, a fuel tank and a carbon canister, wherein the fuel tank is provided with a fuel pump and a dumping valve, the carbon canister is provided with an adsorption port and a desorption port, the fuel pump is connected to the air intake duct, the dumping valve is connected to the adsorption port, a one-way valve is provided between the air intake duct and the carbon canister, the inlet of the one-way valve is connected to the adsorption port, and the outlet of the one-way valve is connected to the air intake duct.

[0005] By adopting the above technical solution, each component in the system can be connected by pipelines according to actual conditions. When the engine is not working, the gasoline in the fuel tank evaporates to produce fuel vapor, which enters the carbon canister and is adsorbed by carbon powder. The carbon canister desorption port is equipped with a one-way valve. At this time, there is no negative pressure in the intake duct, and the one-way valve is in a closed state. The fuel vapor cannot escape into the air through the desorption port, reducing environmental pollution.

[0006] When the engine is working, the air pump draws the fuel in the fuel tank into the intake duct, and the fuel enters the engine through the intake duct for combustion. When the engine is working, there will be an intake stroke, which will cause negative pressure in the intake duct. The one-way valve opens due to the negative pressure in the intake duct, and the carbon canister is connected to the intake duct. Due to the negative pressure, the fuel vapor in the carbon canister is desorbed, and the fuel vapor in the carbon canister enters the combustion chamber through the intake duct for combustion. The adsorbed fuel vapor in the carbon canister is utilized, which improves fuel economy and reduces costs. Compared with the structure of the electronic control valve used in automobiles, this system simplifies the structure and is suitable for general gasoline generator sets.

[0007] Optionally, a two-way valve is provided between the fuel tank and the carbon canister, the inlet of the two-way valve is connected to the dump valve, and the outlet of the two-way valve is connected to the adsorption port.

[0008] By adopting the above technical solution, a pressure setting value can be set for the two-way valve according to actual conditions. When the pressure in the fuel tank is greater than the setting value, the two-way valve is fully opened, and the fuel vapor enters the carbon canister and is adsorbed by the carbon powder; when the pressure generated by the fuel vapor in the fuel tank is less than the pressure setting value of the two-way valve, the two-way valve is closed, and a small amount of fuel vapor enters the carbon canister, reducing the amount of fuel evaporation.

[0009] Optionally, a valve body assembly is provided between the fuel tank and the intake duct, and the valve body assembly is a three-way valve including two inlets and one outlet, one of the inlets of the valve body assembly is connected to the fuel pump, the other outlet of the valve body assembly is connected to the air filter, and the outlet of the valve body assembly is connected to the intake duct.

[0010] By adopting the above technical solution, the air filter can filter the air entering the engine combustion chamber through the intake duct, reduce the impurities in the air involved in combustion, and make the air in the combustion process purer. The valve body assembly controls the fuel and air entering the intake duct as a whole, starts when the engine is working, and closes when the engine is not working, which is easy to operate.

[0011] Optionally, the carbon canister is provided with an air vent, and an air pressure valve is provided at the air vent.

[0012] By adopting the above technical solution, when the engine is not working, the one-way valve is closed. If the fuel vapor in the carbon canister is saturated with adsorption, the air pressure in the carbon canister increases, and the excess fuel vapor can be discharged through the vent to release the pressure in the carbon canister and maintain air pressure balance.

[0013] In summary, the present application includes at least the following beneficial technical effects: When the engine is not working, the gasoline in the fuel tank evaporates to produce fuel vapor. A two-way valve is installed between the fuel tank and the carbon canister adsorption port. The two-way valve can set a pressure setting value according to the actual situation. When the pressure in the fuel tank is greater than the setting value, the two-way valve is fully opened, and the fuel vapor enters the carbon canister and is adsorbed by the carbon powder; when the pressure generated by the fuel vapor in the fuel tank is less than the pressure setting value of the two-way valve, the two-way valve is closed, and a small amount of fuel vapor enters the carbon canister, reducing the amount of fuel evaporation. The carbon canister desorption port is equipped with a one-way valve. At this time, there is no negative pressure in the intake duct, and the one-way valve is in a closed state. The fuel vapor cannot escape into the air through the desorption port, reducing environmental pollution.

[0014] When the engine is working, the air pump draws the fuel in the fuel tank into the intake duct, and the fuel enters the engine through the intake duct for combustion. When the engine is working, there will be an intake stroke, which will cause negative pressure in the intake duct. The one-way valve opens due to the negative pressure in the intake duct, and the carbon canister is connected to the intake duct. Due to the negative pressure, the fuel vapor in the carbon canister is desorbed, and the fuel vapor in the carbon canister enters the combustion chamber through the intake duct for combustion. The adsorbed fuel vapor in the carbon canister is utilized, which improves fuel economy and reduces costs. Compared with the structure of the electronic control valve used in automobiles, this system simplifies the structure and is suitable for general gasoline generator sets. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a novel fuel evaporation system in an embodiment of the present application.

[0016] Explanation of the reference numerals: 1. Engine; 2. Intake duct; 3. Fuel tank; 31. Fuel pump; 32. Dump valve; 4. Carbon canister; 41. Adsorption port; 42. Desorption port; 5. Valve body assembly; 6. Air filter; 7. Atmospheric vent; 8. Two-way valve; 9. One-way valve. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1 This application is described in further detail.

[0018] The embodiment of the present application discloses a novel fuel evaporation system. Figure 1 The novel fuel evaporation system includes an engine 1, an air intake 2, a fuel tank 3 and a carbon canister 4. A fuel pump 31 and a dump valve 32 are provided on the fuel tank 3. An adsorption port 41 and a desorption port 42 are provided on the carbon canister 4. The fuel pump 31 is connected to the air intake 2. The dump valve 32 is connected to the adsorption port 41. A check valve 9 is provided between the air intake 2 and the carbon canister 4. The inlet of the check valve 9 is connected to the adsorption port 41, and the outlet of the check valve 9 is connected to the air intake 2. A two-way valve 8 is provided between the fuel tank 3 and the carbon canister 4. The inlet of the two-way valve 8 is connected to the dump valve 32, and the outlet of the two-way valve 8 is connected to the adsorption port 41.

[0019] A valve body assembly 5 is provided between the fuel tank 3 and the intake duct 2. The valve body assembly 5 is a three-way valve including two inlets and one outlet. One of the inlets of the valve body assembly 5 is connected to the fuel pump 31, and the other outlet of the valve body assembly 5 is connected to the air filter 6. The outlet of the valve body assembly 5 is connected to the intake duct 2. The air filter 6 can filter the air entering the combustion chamber of the engine 1 through the intake duct 2, reduce the impurities in the air involved in the combustion, and make the air in the combustion process purer. The valve body assembly 5 controls the fuel and air entering the intake duct 2 as a whole, starts when the engine 1 is working, and shuts down when the engine 1 is not working, which is easy to operate. The various components in this system are connected by pipelines.

[0020] The carbon canister 4 is provided with an air vent 7, and an air pressure valve is provided at the air vent 7. When the engine 1 is not working, the one-way valve 9 is closed. If the fuel vapor in the carbon canister 4 is saturated with adsorption, the air pressure in the carbon canister 4 increases, and the excess fuel vapor can be discharged through the air vent 7, releasing the pressure in the carbon canister 4 and maintaining air pressure balance.

[0021] The implementation principle of a new type of fuel evaporation system in the embodiment of the present application is as follows: when the engine 1 is not working, the gasoline in the fuel tank 3 evaporates to generate fuel vapor, and a two-way valve 8 is installed between the fuel tank 3 and the adsorption port 41 of the carbon canister 4. The two-way valve 8 can set a pressure setting value according to actual conditions. When the pressure in the fuel tank 3 is greater than the setting value, the two-way valve 8 is fully opened, and the fuel vapor enters the carbon canister 4 and is adsorbed by the carbon powder; when the pressure generated by the fuel vapor in the fuel tank 3 is less than the pressure setting value of the two-way valve 8, the two-way valve 8 is closed, and a small amount of fuel vapor enters the carbon canister 4, reducing the amount of fuel evaporation. The desorption port 42 of the carbon canister 4 is equipped with a one-way valve 9. At this time, there is no negative pressure in the intake duct 2, and the one-way valve 9 is in a closed state, so the fuel vapor cannot escape into the air through the desorption port 42, reducing environmental pollution.

[0022] When the engine 1 is working, the air pump draws the fuel in the fuel tank 3 into the intake passage 2, and the fuel enters the engine 1 through the intake passage 2 for combustion. When the engine 1 is working, there will be an intake stroke, which will cause negative pressure in the intake passage 2. The one-way valve 9 is opened due to the negative pressure in the intake passage 2, and the carbon canister 4 is connected to the intake passage 2. Due to the negative pressure, the fuel vapor in the carbon canister 4 is desorbed, and the fuel vapor in the carbon canister 4 enters the combustion chamber through the intake passage 2 for combustion. The adsorbed fuel vapor in the carbon canister 4 is utilized, which improves fuel economy and reduces costs. Compared with the structure of the electronic control valve used in automobiles, this system simplifies the structure and is suitable for general gasoline generator sets.

[0023] 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 new type of fuel evaporation system, characterized by: The invention comprises an engine (1), an air intake passage (2), a fuel tank (3) and a carbon canister (4); the fuel tank (3) is provided with a fuel pump (31) and a dump valve (32); the carbon canister (4) is provided with an adsorption port (41) and a desorption port (42); the fuel pump (31) is connected to the air intake passage (2); the dump valve (32) is connected to the adsorption port (41); a one-way valve (9) is provided between the air intake passage (2) and the carbon canister (4); the inlet of the one-way valve (9) is connected to the adsorption port (41); and the outlet of the one-way valve (9) is connected to the air intake passage (2).

2. A novel fuel evaporation system according to claim 1, characterized in that: A two-way valve (8) is provided between the fuel tank (3) and the carbon canister (4); the inlet of the two-way valve (8) is connected to the dump valve (32), and the outlet of the two-way valve (8) is connected to the adsorption port (41).

3. A novel fuel evaporation system according to claim 1, characterized in that: A valve body assembly (5) is provided between the fuel tank (3) and the air intake passage (2); the valve body assembly (5) is a three-way valve including two inlets and one outlet; one inlet of the valve body assembly (5) is connected to a fuel pump (31); the other outlet of the valve body assembly (5) is connected to an air filter (6); and the outlet of the valve body assembly (5) is connected to the air intake passage (2).

4. A novel fuel evaporation system according to any one of claims 1 to 3, characterized in that: The carbon canister (4) is provided with an air vent (7), and an air pressure valve is provided at the air vent (7).

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