Carburetor air inlet and fuel evaporation and adsorption automatic switching device

Abstract

The invention relates to the technical field of carburetor automatic gas supply devices, in particular to a carburetor gas inlet and fuel evaporation adsorption automatic switching device which comprises an upper cover and a shell, a carburetor port, a carbon tank port and an atmosphere port are formed in the shell, a pulsating pressure port is formed in the upper cover, and a fuel adsorption device is arranged in the shell and the upper cover. The fuel adsorption device comprises a one-way valve mechanism and a valve rod mechanism, the one-way valve mechanism comprises a valve cover, a valve seat, a diaphragm spring, a diaphragm spring seat and a diaphragm, the valve rod mechanism comprises a valve rod, and a gland, a sealing gasket and a valve plate spring which are used for sealing a cavity B are arranged on the outer side of the valve rod. And the valve rod is automatically switched to an adsorption state during shutdown, so that the problem that fuel volatilizes to pollute the environment is solved, and the problem that a manual three-way valve is relatively low in automation degree to cause serious runaway and flameout is also solved.

Description

Technical Field

[0001] The invention relates to the technical field of automatic air supply devices for carburetors, and in particular to an automatic switching device for air intake and fuel evaporation adsorption for a carburetors. Background Art

[0002] There is fuel in the existing carburetor. When the engine is stopped, the fuel evaporates into the atmosphere, polluting the environment. People will smell the evaporated gasoline after parking. If the evaporated oil and gas are absorbed, the carburetor needs to inhale air when the engine is started, and the air intake line must be manually switched. Otherwise, it will affect the normal operation of the engine. The change in the air-fuel ratio will cause serious wandering and thus flameout.

[0003] There is no specific provision on carburetor volatilization in the emission standards for motorcycles and general engines, so some existing internal combustion engine carburetors directly volatilize into the atmosphere, causing environmental pollution and waste of energy; or a manual three-way valve is used for switching, and there is a possibility of forgetting to turn on the switch. If the switch is not turned on, the fuel will evaporate into the atmosphere, and if the switch is not turned off, it will cause serious engine wandering and thus stalling.

[0004] Therefore, it is necessary to design an automatic switching device to prevent fuel volatilization and waste, pollute the environment, and prevent serious engine failure. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a carburetor air intake and fuel evaporation adsorption automatic switching device to solve the problem of fuel volatilization and serious engine stalling.

[0006] In order to solve the above problems, the technical solution of the present invention is as follows: a carburetor intake and fuel evaporation adsorption automatic switching device, including an upper cover and a shell, a cavity A is provided in the upper cover, and a cavity B is provided in the shell, the shell is provided with a carburetor port connected to the carburetor, a carbon canister port connected to the carbon canister of the fuel tank, and an atmosphere port connected to the atmosphere, the upper cover is provided with a pulsating pressure port connected to the intake manifold of the engine, and a fuel adsorption device that runs up and down and automatically switches the fuel state is provided in the shell and the upper cover.

[0007] Furthermore, the fuel adsorption device includes a one-way valve mechanism at the upper end, and a valve column mechanism at the lower end which moves up and down with the one-way valve and switches the connection state of the carburetor port, the carbon canister port, and the atmosphere port.

[0008] Furthermore, the one-way valve mechanism includes a valve cover, a valve seat, a diaphragm spring, a diaphragm spring seat, and a diaphragm which are arranged in the A cavity from top to bottom, and the valve seat is adapted to the top of the A cavity.

[0009] Furthermore, a through hole for air to pass through is provided on the valve cover, and a filter hole for filtering positive pressure and retaining negative pressure is provided on the valve seat.

[0010] Furthermore, a buffer groove for buffering pulse pressure is provided on the valve seat.

[0011] Furthermore, the valve column mechanism includes a valve column arranged in the housing and connected to the diaphragm, and a pressure cover, a sealing gasket, and a valve spring for sealing the B cavity are arranged on the outside of the valve column.

[0012] Furthermore, the number of the sealing gaskets is two.

[0013] Furthermore, a C cavity communicating with the carbon canister port is provided in the shell.

[0014] Furthermore, a fixing plate for fixing is provided on the shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects: when the engine is started, it automatically switches to the state of inhaling the atmosphere, and when it is shut down, the valve column automatically switches to the adsorption state, which solves the problem of fuel volatilization polluting the environment, and also solves the problem of the manual three-way valve having a low degree of automation, resulting in serious engine wandering and thus flameout. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance of the present invention;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the valve cover structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the valve seat structure of the present invention;

[0020] Figure 5 It is an exploded view of the present invention.

[0021] In the figure: 1 upper cover, 2 shell, 3A cavity, 4B cavity, 5 carburetor port, 6 carbon canister port, 7 atmosphere port, 8 pulsating pressure port, 9 valve cover, 901 through hole, 10 valve seat, 1001 filter hole, 1002 buffer groove, 11 diaphragm spring, 12 diaphragm spring seat, 13 diaphragm, 14 valve column, 15 pressure cover, 16 sealing gasket, 17 valve spring, 18 fixing plate, 19C cavity. DETAILED DESCRIPTION

[0022] like Figure 1-5As shown, a carburetor intake and fuel evaporation adsorption automatic switching device comprises an upper cover 1 and a shell 2. A cavity A is provided in the upper cover, a B cavity 4 is provided in the shell 2, a carburetor port 5 connected to the carburetor, a carbon canister port 6 connected to the carbon canister of the fuel tank, and an atmosphere port 7 connected to the atmosphere are provided on the shell 2. The upper cover 1 is provided with a pulsating pressure port 8 connected to the intake manifold of the engine. A fuel adsorption device that runs up and down and automatically switches the fuel state is provided in the shell 2 and the upper cover 1. A C cavity 19 connected to the carbon canister port is provided in the shell, and a fixing plate 18 for fixing is provided on the shell 2.

[0023] The fuel adsorption device includes a one-way valve mechanism at the upper end, and a valve column mechanism at the lower end which moves up and down with the one-way valve and switches the connection state of the carburetor port 5, the carbon canister port 6, and the atmosphere port 7.

[0024] The one-way valve mechanism comprises a valve cover 9, a valve seat 10, a diaphragm spring 11, a diaphragm spring seat 12, and a diaphragm 13 which are arranged in the A cavity 3 from top to bottom in sequence, and the valve seat 10 is adapted to the top of the A cavity 3.

[0025] like Figure 3 As shown, the valve cover 9 is provided with a through hole 901 for air to pass through. Figure 4 As shown, a filter hole 1001 for filtering positive pressure and retaining negative pressure is provided on the valve seat 10, and a buffer groove 1002 for buffering pulse pressure is provided on the valve seat 10.

[0026] like Figure 2 As shown, the valve column mechanism includes a valve column 14 arranged in the housing 2 and connected to the diaphragm 13. A pressure cover 15, a sealing gasket 16, and a valve plate spring 17 for sealing the B chamber 4 are provided on the outside of the valve column 14. There are two sealing gaskets 16, which are used to seal the valve column 14 and the pressure cover 15, and the valve column 14 and the atmosphere port 7.

[0027] When the engine is started, positive and negative pressures are formed at the pulsating pressure port 8. When the pressure is positive, the gas impacts the valve cover 9 and the valve seat 10 from the pulsating pressure port 8. When the air pressure on the valve seat 10 is greater than the valve cover 9, the gas enters the A chamber 3 from the through hole 901, the buffer groove 1002 and the filter hole 1001, presses down the diaphragm 13 and the valve column 14, and blocks the atmosphere port 7; when the pressure is negative, the gas in the A chamber 3 enters the pulsating pressure port 8 from the filter hole 1001, the buffer groove 1002 and the through hole 901, and forms a one-way upward negative pressure in the A chamber 3 after filtering the positive pressure through the one-way valve mechanism, thereby driving the diaphragm 13 to rise, and the pressure cover 15 and the valve column 14 move upward under the action of the valve spring 17, opening the atmosphere port 7 so that it is in contact with the atmosphere port 7. The carburetor port 5 is connected to supply sufficient air, and at the same time, the valve column 14 cuts off the carbon canister port 6 and closes the C chamber 19. During the switching process, the atmospheric port 7 and the carbon canister port 6 are both in a high-pressure state, so the oil-containing vapor will be sucked into the carburetor and will not leak into the air; when the engine stops, there is residual fuel in the carburetor, and the valve column 14 moves downward under the action of the valve plate spring 17, so that the valve column 14 contacts the atmospheric port 7 to close the atmospheric port 7, and at the same time opens the B chamber 4 and the C chamber 19 to open the carbon canister port 6. At this time, the adsorbed fuel in the carbon canister port 6 has been desorbed, and the pressure is below the atmospheric pressure. When switching, the valve column 14 will have two pipelines open at the same time, and will not leak into the atmosphere due to the pressure difference.

[0028] The present application has a compact structure and occupies a small space. It can quickly realize the normal air flow supply of the engine carburetor when starting, and can simultaneously ensure the timely closure of the volatilized fuel vapor channel. It is safe and reliable, has good versatility, does not require manual intervention, and automatically opens and closes with the start and stop of the engine throughout the entire process.

[0029] The above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, a person skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A carburetor air intake and fuel evaporation adsorption automatic switching device, comprising an upper cover and a shell, wherein a cavity A is provided in the upper cover and a cavity B is provided in the shell, and the characteristics are: The shell is provided with a carburetor port connected to the carburetor, a carbon canister port connected to the carbon canister of the fuel tank, and an atmosphere port connected to the atmosphere. The upper cover is provided with a pulsating pressure port connected to the intake manifold of the engine. A fuel adsorption device that runs up and down and automatically switches the fuel state is provided in the shell and the upper cover.

2. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 1, characterized in that: The fuel adsorption device comprises a one-way valve mechanism at the upper end, and a valve column mechanism at the lower end which moves up and down with the one-way valve and switches the connection state of the carburetor port, the carbon canister port and the atmosphere port.

3. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 2, characterized in that: The one-way valve mechanism comprises a valve cover, a valve seat, a diaphragm spring, a diaphragm spring seat and a diaphragm which are arranged in the A cavity from top to bottom in sequence, and the valve seat is adapted to the top of the A cavity.

4. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 3, characterized in that: A through hole for air to pass through is arranged on the valve cover, and a filter hole for filtering positive pressure and retaining negative pressure is arranged on the valve seat.

5. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 4, characterized in that: A buffer groove for buffering pulse pressure is provided on the valve seat.

6. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 5, characterized in that: The valve column mechanism comprises a valve column which is arranged in the housing and connected to the diaphragm. A pressure cover, a sealing gasket and a valve spring for sealing the B cavity are arranged on the outside of the valve column.

7. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 6, characterized in that: The number of the sealing gaskets is two.

8. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 7, characterized in that: A C cavity communicated with the carbon canister port is arranged in the shell.

9. The carburetor air intake and fuel evaporation adsorption automatic switching device according to claim 1, characterized in that: A fixing plate for fixing is provided on the housing.

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