Air pressure switch type carburetor three-way valve

Abstract

The utility model provides an air pressure switch type carburetor three-way valve, which relates to the field of carburetors, and comprises a valve body, an upper cover is fixedly arranged above the valve body, an air cavity gland ring is fixedly arranged below the upper cover in the valve body, a through hole for air to enter is arranged at the bottom end of the valve body, and a diaphragm is arranged between the upper cover and the air cavity gland ring. One end of the upper cover is connected with and penetrates through a pressure pipe used for being communicated with an intake manifold. According to the air pressure switch type carburetor three-way valve, positive and negative switching pulsating pressure is periodically generated in the working process of an engine, the one-way valve is blocked when positive pressure passes, the one-way valve is opened when negative pressure passes, the diaphragm is attracted to move upwards, the diaphragm drives the valve plate seat to move upwards, and a middle hole of the air cavity gland ring is sealed through the sealing gasket; and the through hole in the bottom end is opened for air to enter, so that air intake can be automatically started when the vehicle works normally, air intake can be automatically stopped when the vehicle is closed, and the problem that manual operation is needed is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to carburetor technical field, concretely is a kind of three-way valve of air pressure switch type carburetor. BACKGROUND

[0002] The fuel in the existing carburetor volatilizes into atmosphere when stopping, polluting the environment. After parking, people can smell the volatile gasoline smell. If the volatile oil gas is adsorbed, the carburetor needs to inhale 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 affected and cause the engine to be extinguished.

[0003] Because the emission standards of motorcycles and motorcycles still in use do not specify the volatilization of carburetors, some existing internal combustion engine carburetors are directly volatilized into the atmosphere. Some products use a manual three-way valve to switch, which may be forgotten to turn on or off, which may volatilize without turning on or off, and may cause the engine to be seriously affected and cause the engine to be extinguished. Therefore, a device capable of automatically opening the air inlet and automatically closing the air inlet is needed. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a kind of three-way valve of air pressure switch type carburetor, solve the problem raised in background art.

[0005] TECHNICAL SCHEME

[0006] To achieve the above purpose, the utility model is realized by the following technical scheme: a kind of three-way valve of air pressure switch type carburetor, including valve body, the upper portion of valve body is fixedly installed with upper cover, the inside of valve body is fixedly installed with air cavity gland ring below upper cover, the bottom end of valve body is provided with through hole for air inlet, upper cover and air cavity gland ring are provided with diaphragm between, one end of upper cover is connected and penetrates pressure pipe for being communicated with inlet manifold, one-way valve is provided between pressure pipe and diaphragm in the inside of upper cover, so that diaphragm moves upward, the inside of valve body is slidably connected with valve seat, the upper and lower ends of valve seat are provided with sealing gasket, the inner ring of upper sealing gasket is used to seal air cavity gland ring, the lower sealing gasket is used to seal through hole, two sealing gaskets work alternately, valve seat is fixedly connected with diaphragm, the upper portion of valve body is provided with half ring groove, half ring groove is communicated with the inside of valve body through the inner ring of air cavity gland ring, one end of valve body is connected and penetrates carbon canister pipe, carbon canister pipe is connected and penetrates half ring groove, the other end of valve body is connected and penetrates carburetor pipe, carburetor pipe is connected and penetrates the inside of valve body, diaphragm and one-way valve are fixedly connected by diaphragm spring between.

[0007] Further, the valve seat and the inner bottom wall of the valve body are fixedly connected by a return spring.

[0008] Further, the valve body and the air cavity gland ring are connected by ultrasonic welding.

[0009] Further, the sealing gasket and the through hole are normally closed, the sealing gasket and the air cavity gland ring are normally open, the sealing gasket and the through hole are opened when the diaphragm is sucked up, and the sealing gasket and the air cavity gland ring are closed.

[0010] Further, the pressure pipe, the carbon tank pipe and the fuel pipe are arranged on the same plane and are parallel to each other, and the outer side of the valve body is fixedly provided with a connecting frame perpendicular to the pressure pipe.

[0011] Further, the upper side of the diaphragm is fixedly provided with a spring seat, and the diaphragm spring is fixedly connected with the spring seat.

[0012] The utility model discloses the beneficial effect lies in:

[0013] 1. The air pressure switch type carburetor three-way valve, through the periodic generation of positive and negative switching pulse pressure in the process of engine working, when positive pressure passes through, the check valve is blocked, when negative pressure passes through, the check valve is opened, the diaphragm is attracted to move upwards, the diaphragm drives the valve seat to move upwards, so that the sealing gasket closes the middle hole of the air cavity gland ring, and the through hole at the bottom is opened for air to enter, so that the air inlet can be automatically opened when the vehicle is working normally, and the air inlet is automatically closed when the vehicle is turned off, avoiding the problem of manual operation.

[0014] 2. The air pressure switch type carburetor three-way valve, through the setting of the pressure pipe, the carbon tank pipe and the fuel pipe, the middle lines of the pressure pipe, the carbon tank pipe and the fuel pipe are arranged on the same plane and are parallel to each other, and the outer side of the valve body is fixedly provided with a connecting frame perpendicular to the pressure pipe, so that the connection of the device is facilitated. DRAWINGS

[0015] Fig. 1 It is a half-section schematic view of the utility model;

[0016] Fig. 2 It is a half-section schematic view of the valve body of the utility model;

[0017] Fig. 3 It is an explosion view of the utility model.

[0018] 1, valve body; 2, upper cover; 3, check valve; 4, diaphragm spring; 5, spring seat; 6, diaphragm; 7, valve seat; 8, air cavity gland ring; 9, reset spring; 10, sealing gasket; 11, through hole; 12, pressure pipe; 13, carbon tank pipe; 14, fuel pipe; 15, connecting frame; 16, half-ring groove. CONCRETE IMPLEMENTATION

[0019] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] Referring to Figs. 1-3 A kind of air pressure switch type carburetor three-way valve, including valve body 1, the upper of valve body 1 is fixedly installed with upper cover 2, the inside of valve body 1 is fixedly installed with air cavity gland ring 8 below upper cover 2, the bottom end of valve body 1 is provided with through hole 11 for air entering, upper cover 2 and air cavity gland ring 8 between are provided with diaphragm 6, one end of upper cover 2 is connected and penetrates pressure pipe 12 for being communicated with intake manifold, or be connected in engine crankcase, the inside of upper cover 2 is provided with check valve 3 between pressure pipe 12 and diaphragm 6, and the pressure generated by engine forms negative pressure under the action of check valve 3, so as to be able to attract diaphragm 6 to rise, the inside of valve body 1 is slidably connected with valve piece seat 7, the upper and lower ends of valve piece seat 7 are provided with sealing gasket 10, the inner ring of upper sealing gasket 10 is used to seal air cavity gland ring 8, the lower sealing gasket 10 is used to seal through hole 11, two sealing gaskets 10 work alternately, valve piece seat 7 is fixedly connected with diaphragm 6, the upper of valve body 1 is provided with half ring groove 16, half ring groove 16 is communicated with the inside of valve body 1 by the inner ring of air cavity gland ring 8, one end of valve body 1 is connected and penetrates carbon canister pipe 13, carbon canister pipe 13 is shared with the carbon canister end of oil tank, is adsorbed simultaneously, decarbonization pipe 13 is connected and penetrates half ring groove 16, the other end of valve body 1 is connected and penetrates carburetion pipe 14, carburetion pipe 14 is connected on carburetor, the direction of medium transmission is the positive direction of air, and the reverse direction of oil gas flows.Carburetion pipe 14 is connected and penetrates with the inside of valve body 1, diaphragm 6 and check valve 3 are fixedly connected by diaphragm spring 4 between them.In switching process, atmospheric end and carbon canister end are all high air pressure state, so that oil vapor is inhaled into carburetor and will not leak into air

[0021] Valve piece seat 7 and the inner bottom wall of valve body 1 are fixedly connected by reset spring 9, and by such setting, valve piece seat 7 can be reset.

[0022] Valve body 1 and air cavity gland ring 8 are ultrasonically welded, and by such setting, the sealing of the inside of valve body 1 can be ensured.

[0023] The sealing gasket 10 is always closed with the through hole 11, and always open with the air cavity gland ring 8. When the diaphragm 6 is sucked, the sealing gasket 10 is open with the through hole 11, and closed with the air cavity gland ring 8. Through such setting, it can be ensured that the sealing gasket 10 can only keep the air inlet in the working process. The valve seat 7 and the sealing gasket 10 are combined and moved downward under the action of the diaphragm spring 4, so that the sealing gasket 10 contacts the sealing line on the valve body 1 to close the air supply pipeline, and at the same time, the sealing line between the sealing gasket 10 and the air cavity gland ring 8 is opened to open the adsorption pipeline. At this time, the adsorbed fuel in the carbon tank has been desorbed and treated, and the pressure is lower than the atmospheric pressure. The valve seat 7 and the sealing gasket 10 are combined and opened at the same time, and because of the pressure difference, there is no leakage to the atmosphere.

[0024] The center lines of the pressure pipe 12, the carbon tank pipe 13 and the carburetor pipe 14 are located in the same plane and remain parallel. The valve body 1 is fixedly installed with a connecting frame 15 perpendicular to the pressure pipe 12. Through such setting, it can be convenient for the connection of the device.

[0025] The diaphragm 6 is fixedly installed with a spring seat 5, and the diaphragm spring 4 is fixedly connected with the spring seat 5. Through the setting of the spring seat 5, it can be convenient for the installation of the diaphragm spring 4, and avoid the diaphragm spring 4 piercing the diaphragm 6.

[0026] The carburetor air supply automatic device has compact structure and small space occupation. When starting, it can quickly realize the normal air flow supply of the engine carburetor, and can also ensure the timely closing of the volatile fuel vapor channel. It is safe and reliable, has good universality, and is suitable for 50cc-500cc models. It does not need manual intervention and automatically opens and closes throughout the engine start and stop.

[0027] When in use, the engine periodically generates positive and negative switching pulse pressure during the working process. When the positive pressure passes, the one-way valve 3 blocks, and when the negative pressure passes, the one-way valve 3 opens, attracting the diaphragm 6 to move upward, driving the valve seat 7 to move upward through the diaphragm 6, so that the sealing gasket 10 closes the middle hole of the air cavity gland ring 8, and opens the through hole 11 at the bottom end for air to enter, so that the air inlet can be automatically opened when the vehicle is working normally, and the air inlet can be automatically closed when the vehicle is turned off, avoiding the problem of manual operation.

[0028] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0029] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A three-way valve for a barometric pressure switch carburetor comprising a valve body (1), characterized in that: The upper cover (2) is fixedly installed above the valve body (1), the air cavity gland ring (8) is fixedly installed below the upper cover (2) inside the valve body (1), the through hole (11) for air entering is arranged at the bottom end of the valve body (1), the diaphragm (6) is arranged between the upper cover (2) and the air cavity gland ring (8), the pressure pipe (12) for communicating with the intake manifold is connected and penetrates one end of the upper cover (2), the one-way valve (3) for enabling the diaphragm (6) to move upward is arranged between the pressure pipe (12) and the diaphragm (6) inside the upper cover (2); The valve piece seat (7) is slidably connected inside the valve body (1), the upper and lower ends of the valve piece seat (7) are provided with the sealing gaskets (10), the inner ring of the upper sealing gasket (10) is used for sealing the air cavity gland ring (8), the lower sealing gasket (10) is used for sealing the through hole (11), the two sealing gaskets (10) work alternately, and the valve piece seat (7) is fixedly connected with the diaphragm (6); The semi-ring groove (16) is arranged above the valve body (1), the semi-ring groove (16) is communicated with the inside of the valve body (1) through the inner ring of the air cavity gland ring (8), the carbon tank pipe (13) is connected and penetrates one end of the valve body (1), the carbon tank pipe (13) is connected and penetrates the semi-ring groove (16), the carburetor pipe (14) is connected and penetrates the other end of the valve body (1), the carburetor pipe (14) is connected and penetrates the inside of the valve body (1), and the diaphragm (6) is fixedly connected with the one-way valve (3) through the diaphragm spring (4).

2. The gas pressure switch carburetor three-way valve according to claim 1, characterized in that: The valve piece seat (7) and the inner bottom wall of the valve body (1) are fixedly connected through the reset spring (9).

3. The gas pressure switch carburetor three-way valve according to claim 1, characterized in that: The valve body (1) and the air cavity gland ring (8) are ultrasonically welded.

4. The gas pressure switch carburetor three-way valve according to claim 1, characterized in that: The sealing gaskets (10) and the through hole (11) are normally closed, the sealing gaskets (10) and the air cavity gland ring (8) are normally open, the sealing gaskets (10) and the through hole (11) are opened when the diaphragm (6) is sucked, and the sealing gaskets (10) and the air cavity gland ring (8) are closed.

5. The barometric pressure switch carburetor three-way valve according to claim 1, characterized in that: The middle lines of the pressure pipe (12), the carbon tank pipe (13) and the carburetor pipe (14) are located in the same plane and remain parallel, and the connecting frame (15) perpendicular to the pressure pipe (12) is fixedly installed on the outside of the valve body (1).

6. The barometric pressure switch carburetor three-way valve according to claim 1, characterized in that: The spring seat (5) is fixedly installed above the diaphragm (6), and the diaphragm spring (4) is fixedly connected with the spring seat (5).

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