Carburetor air inlet and fuel evaporation and adsorption automatic switching device

Abstract

The utility model relates to the technical field of carburetor automatic air supply devices, in particular to a carburetor air 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 arranged on the shell, a pulsating pressure port is arranged on 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 utility model relates to carburetor automatic air supply device technical field, concretely relates to a kind of carburetor air intake and fuel evaporation adsorption automatic switching device. BACKGROUND

[0002] Fuel exists in the existing carburetor, and when the machine is stopped, the fuel volatilizes into the atmosphere, polluting the environment, and people can smell the volatilized gasoline smell after parking. If the volatilized oil gas is adsorbed, the carburetor needs to suck in air when starting, and the air inlet pipe must be manually switched, otherwise it will affect the normal operation of the engine, and the change of air-fuel ratio will cause the engine to be seriously overheated and stall.

[0003] The emission standards for using motorcycles and engines do not specify the volatilization of carburetors, so some existing internal combustion engine carburetors directly volatilize into the atmosphere, causing environmental pollution and waste of energy. Or use a manual three-way valve to switch, there is a possibility of forgetting to turn on and off, and fuel will volatilize into the atmosphere if it is not turned on, and the engine will be seriously overheated and stall if it is not turned off.

[0004] Therefore, an automatic switching device needs to be designed to prevent fuel from volatilizing and wasting, polluting the environment, and preventing the engine from being seriously overheated and stalling. SUMMARY

[0005] To solve the problems in the prior art, the utility model provides a carburetor air intake and fuel evaporation adsorption automatic switching device to solve the problem of fuel volatilization and engine overheating and stalling.

[0006] To solve the above problems, the technical scheme of the utility model is as follows: a carburetor air intake and fuel evaporation adsorption automatic switching device, comprising a cover and a housing, an A cavity is provided in the cover, and a B cavity is provided in the housing, a carburetor port connected to the carburetor, a carbon canister port connected to the carbon canister of the fuel tank, and an atmosphere port communicating with the atmosphere are provided on the housing, the cover is provided with a pulsating pressure port connected to the intake manifold of the engine, and a fuel adsorption device that automatically switches the fuel state is provided in the housing and the cover and runs up and down.

[0007] Further, the fuel adsorption device comprises a one-way valve mechanism at the upper end, and a valve column mechanism that switches the communication state of the carburetor port, the carbon canister port and the atmosphere port and runs up and down with the one-way valve.

[0008] Further, the one-way valve mechanism comprises a valve cover, a valve seat, a diaphragm spring, a diaphragm spring seat and a diaphragm arranged in the A cavity from top to bottom, and the valve seat is matched with the top of the A cavity.

[0009] Further, 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] Further, the buffer groove is arranged on the valve seat to buffer the pulse pressure.

[0011] Further, the valve post mechanism comprises a valve post arranged in the shell and connected with the diaphragm, and a gland, a sealing gasket and a valve spring are arranged on the outer side of the valve post to seal the B cavity.

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

[0013] Further, the C cavity is arranged in the shell and communicates with the carbon tank port.

[0014] Further, the fixing plate is arranged on the shell for fixation.

[0015] Compared with the prior art, the utility model has the following beneficial effects: when the engine is started, the automatic switching to the state of inhaling atmosphere is realized, and when the engine is stopped, the valve post is automatically switched to the adsorption state, the problem of fuel volatilization polluting the environment is solved, and the problem of low automation degree of the manual three-way valve leading to the engine being seriously damaged and thus being extinguished is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an appearance schematic view of the utility model;

[0017] Figure 2 It is a sectional structure schematic view of the utility model;

[0018] Figure 3 It is a valve cover structure schematic view of the utility model;

[0019] Figure 4 It is a valve seat structure schematic view of the utility model;

[0020] Figure 5 It is an explosion view of the utility model.

[0021] In the drawing: 1 upper cover, 2 shell, 3 A cavity, 4 B cavity, 5 carburetor port, 6 carbon tank 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 post, 15 gland, 16 sealing gasket, 17 valve spring, 18 fixing plate, 19 C cavity. DETAILED DESCRIPTION

[0022] As Figures 1-5As shown, an automatic switching device for carburetor intake and fuel evaporation adsorption includes an upper cover 1 and a housing 2. The upper cover has a cavity A, and the housing 2 has a cavity B 4. The housing 2 has a carburetor port 5 connected to the carburetor, a carbon canister port 6 connected to the carbon canister of the fuel tank, and an atmospheric port 7 connected to the atmosphere. The upper cover 1 has a pulsating pressure port 8 connected to the intake manifold of the engine. The housing 2 and the upper cover 1 have a fuel adsorption device that moves up and down and automatically switches fuel states. The housing has a cavity C 19 connected to the carbon canister port. The housing 2 has a fixing plate 18 for fixing.

[0023] The fuel adsorption device includes an upper one-way valve mechanism and a lower valve column mechanism that moves up and down with the one-way valve to switch the connection status of carburetor port 5, canister port 6, and atmospheric port 7.

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

[0025] like Figure 3 As shown, the valve cover 9 has a through hole 901 for air passage, such as... Figure 4 As shown, the valve seat 10 is provided with a filter hole 1001 for filtering positive pressure and retaining negative pressure, 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 located inside the housing 2 and connected to the diaphragm 13. On the outside of the valve column 14, there are a pressure cap 15, a sealing gasket 16, and a valve plate spring 17 for sealing the B cavity 4. There are two sealing gaskets 16, which are used to seal the valve column 14 and the pressure cap 15, and the valve column 14 and the atmospheric port 7.

[0027] When the engine starts, positive and negative pressures are formed in 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 pressure on the valve seat 10 is greater than the valve cover 9, the gas enters the A cavity 3 from the through hole 901, the buffer groove 1002 and the filter hole 1001, and presses down the diaphragm 13 and the valve column 14, thereby blocking the atmospheric port 7. When the pressure is negative, the gas in the A cavity 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 negative pressure in the A cavity 3 after being filtered by the one-way valve mechanism under positive pressure, thereby driving the diaphragm 13 to rise, the gland 15 and the valve column 14 to move upward under the action of the valve plate spring 17, and the atmospheric port 7 to open and communicate with the carburetor port 5 to supply sufficient air, while the valve column 14 cuts off the carbon canister port 6 to close the C cavity 19. During the switching process, the atmospheric port 7 and the carbon canister port 6 are both in a high-pressure state, so that the oil-containing vapor is absorbed 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, while the B cavity 4 and the C cavity 19 are opened to open the carbon canister port 6. At this time, the adsorbed fuel in the carbon canister port 6 has been desorbed and treated, and the pressure is lower than the atmospheric pressure. The valve column 14 will be in a state of opening two pipelines at the same time during switching, and will not leak into the air due to the pressure difference.

[0028] The application has the advantages of compact structure, small space occupation, quick realization of normal air flow supply of the engine carburetor during starting, timely closing of the fuel vapor channel that has been volatilized, safety and reliability, good universality, no need for manual intervention, and automatic opening and closing with the engine starting and stopping.

[0029] The above specific embodiments are only used to illustrate the technical solutions of the application and not to limit. Although the application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the application can be modified or replaced equivalently without departing from the scope of the technical solutions of the application, and all should be included in the scope of the claims of the application.

Claims

1. An automatic switching device for carburetor intake and fuel evaporation adsorption, comprising a top cover and a housing, wherein the top cover has a cavity A and the housing has a cavity B, characterized in that: The housing 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 atmospheric port connected to the atmosphere. The top cover is provided with a pulsating pressure port connected to the intake manifold of the engine. A fuel adsorption device that moves up and down and automatically switches fuel states is provided inside the housing and the top cover.

2. The automatic switching device for carburetor intake and fuel evaporation adsorption according to claim 1, characterized in that: The fuel adsorption device includes an upper one-way valve mechanism and a lower valve column mechanism that moves up and down with the one-way valve to switch the connection status of the carburetor port, canister port, and atmospheric port.

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

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

5. The automatic switching device for carburetor intake and fuel evaporation adsorption according to claim 4, characterized in that: The valve seat is equipped with a buffer groove to buffer pulse pressure.

6. The automatic switching device for carburetor intake and fuel evaporation adsorption according to claim 5, characterized in that: The valve column mechanism includes a valve column located inside the housing and connected to the diaphragm, and a pressure cap, a sealing gasket, and a valve plate spring for sealing cavity B are provided on the outside of the valve column.

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

8. The automatic switching device for carburetor intake and fuel evaporation adsorption according to claim 7, characterized in that: A C-cavity is provided inside the housing, which communicates with the carbon canister port.

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

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