Carburetor capable of preventing gasoline evaporation and dumping oil leakage

Abstract

The utility model discloses a carburetor capable of preventing gasoline evaporation and dumping oil leakage. The carburetor comprises a body, a throat pipe, a floater chamber, a first air nozzle, an oil nozzle and a main metering jet. An electronic valve is mounted at the bottom of the floater chamber, and a pin of the electronic valve blocks a lower port of the main metering hole during power failure to prevent fuel oil / gas from volatilizing; the body is further connected with a negative pressure valve, and when a pressure air source is introduced into a second air nozzle of the negative pressure valve, the valve needle is pushed through transmission of the diaphragm to block an inner hole of the main metering jet, and fuel supply is cut off. When the gas mode is switched to, gas enters the throat pipe through the first gas nozzle and enters the pressure cavity of the negative pressure valve through the second gas nozzle at the same time, the diaphragm is pushed to enable the valve needle to plug the main metering hole, and manual operation is not needed. When the engine stops or topples over, the electronic valve is powered off, the pin blocks the main metering hole, and volatilization of combustible gas and continuous oil supply are avoided. According to the utility model, the problems of deflagration, fuel oil loss and cumbersome switching in the prior art are solved, and the safety and the use convenience are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine fuel mixing devices, in particular to a carburetor for an oil-gas dual-purpose engine, which is particularly suitable for solving the problems of fuel volatilization, oil spillage and complicated fuel switching. Background Art

[0002] A dual-fuel carburetor mixes and atomizes fuel or gas with air. Using the vacuum created by the engine, air flows through the throat at high speed, creating a negative pressure zone (the Venturi effect). This draws the fuel or gas out of the float chamber into the main metering orifice and atomizes it into fine particles, providing a combustible mixture for the engine. However, existing technologies have the following drawbacks:

[0003] Fuel (gasoline) volatilization causes explosion and loss: After the engine stops running, the residual heat will cause the remaining fuel or gas in the carburetor to evaporate, filling the engine compartment with flammable gas, posing a risk of explosion; at the same time, volatilization causes fuel loss, increasing usage costs.

[0004] Safety hazards of dumping: When a vehicle dumps, the fuel in the carburetor may continue to be supplied to the engine, causing abnormal combustion or even explosion, threatening the safety of equipment and personnel.

[0005] Fuel switching is cumbersome: When switching between fuel oil and gas, the oil and gas supply must be manually cut off, which is inconvenient to operate and affects efficiency.

[0006] Therefore, a carburetor with improved structure is in urgent need to solve the above problems. Utility Model Content

[0007] In order to solve the above problems, the purpose of this utility model is to provide a carburetor that prevents gasoline evaporation and oil spillage, which solves the problems of fuel volatilization, oil spillage and the cumbersome switching of oil and gas fuels by automatically controlling the on and off of the fuel supply channel.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a carburetor that prevents gasoline evaporation and spillage, comprising a main body, the main body being provided with a throat and a float chamber, the main body being provided with a first air nozzle leading to the throat and an oil nozzle leading to the float chamber; the float chamber being provided with a main metering orifice leading to the throat; the lower end of the main metering orifice being in communication with the float chamber, the upper end of the main metering orifice being in communication with the negative pressure area of ​​the throat, and during normal operation, fuel entering the throat through the main metering orifice.

[0009] An electronic valve is installed at the bottom of the float chamber, and the electronic valve includes a retractable pin. The electronic valve also includes a shell, a moving iron core and a spring. The moving iron core is fixedly connected to the pin, and the spring is sleeved on the outside of the pin, with one end abutting against the seat built into the shell, and the other end abutting against the moving iron core. When the electronic valve is powered off, the pin extends out under the action of the spring and blocks the lower port of the main metering orifice, cutting off the communication between the main metering orifice and the float chamber; when the electronic valve is powered on, the coil in the electronic valve is energized to generate a magnetic field, and the moving iron core connected to the pin retracts under the action of the electromagnetic force, opening the lower port of the main metering orifice, so that the main metering orifice is connected to the float chamber.

[0010] It also includes a negative pressure valve connected to the float chamber, and the negative pressure valve is provided with a second air nozzle; a pinhole leading to the side wall of the main metering orifice is provided in the negative pressure valve, and a side hole corresponding to the pinhole is provided on the side wall of the main metering orifice; a diaphragm cavity is formed in the negative pressure valve, and adjacent first and second diaphragms are sequentially arranged in the diaphragm cavity, a valve needle is fixedly connected to the first diaphragm, a spring groove is provided at the inlet end of the needle hole, a compression spring is arranged between the spring groove and the valve needle, and the valve needle is telescopic and movable along the needle hole guide; its outer peripheral surface is in contact with the compression spring, and the compression spring is used to push the valve needle to exit the side hole of the main metering orifice.

[0011] A pressure cavity communicated with the second air nozzle is formed between the second diaphragm and the inner wall of the diaphragm cavity; and the first diaphragm and the second diaphragm are respectively provided with convex blocks in contact with each other.

[0012] When switched to gas supply mode, the gas pipeline splits into two: one leading to the first gas nozzle (supplying gas to the throat through the gas metering hole), and the other leading to the second gas nozzle (supplying gas to the pressure chamber of the negative pressure valve). When the second gas nozzle supplies gas, the second diaphragm is pressurized and pushes the first diaphragm through the protrusion. The first diaphragm drives the valve needle out of the needle hole, passes through the side hole of the main metering hole, and blocks the inner hole of the main metering hole, cutting off the fuel supply.

[0013] When the gas supply is cut off, the gas supply is cut off, and the valve needle in the negative pressure valve withdraws from the side hole of the main metering orifice under the action of the compression spring. The main metering orifice retracts through the pin of the electronic valve (the electronic valve needs to be energized) and communicates with the float chamber, thereby restoring the fuel supply.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. Anti-volatilization and anti-explosion: When the fuel is supplied, the engine stops or tilts, the electronic valve is de-energized, and the pin blocks the main metering orifice under the action of the spring, cutting off the connection between the float chamber and the throat, preventing the volatilization of residual fuel, reducing the concentration of combustible gas in the engine compartment, and eliminating the risk of explosion.

[0016] 2. Anti-dumping and oil leakage: When the vehicle dumps during fuel supply, the sensor can trigger the electronic valve to cut off the power (need to cooperate with the vehicle control system), and the pin will quickly block the main metering orifice to prevent continuous fuel supply to the engine, thereby improving safety.

[0017] 3. Automatic fuel switching: When switching to gas, air is supplied to the pressure chamber of the negative pressure valve through the second gas nozzle, and the main metering orifice is automatically blocked by the diaphragm transmission, without manual operation; when the gas is cut off, the spring returns to restore the fuel supply, simplifying the operation process and improving the convenience of use.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of a specific embodiment of the present utility model;

[0020] Figure 2 A cross-sectional view of a specific embodiment of the present utility model;

[0021] Figure 3 for Figure 2 A magnified view of center.

[0022] In the figure, 1. main body; 2. throat; 3. float chamber; 4. first air nozzle; 5. oil nozzle; 6. main metering orifice; 7. electronic valve; 71. housing; 72. moving iron core; 73. spring; 74. pin; 8. negative pressure valve; 9. second air nozzle; 10. diaphragm cavity; 11. first diaphragm; 12. second diaphragm; 13. valve needle; 14. pinhole; 15. side hole; 16. spring slot; 17. compression spring; 18. pressure chamber; 19. bump. DETAILED DESCRIPTION

[0023] The present invention is described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] like Figure 1 — Figure 3 As shown, this embodiment discloses a carburetor that prevents gasoline evaporation and spillage, comprising:

[0025] Body structure

[0026] Body 1 forms the carburetor's main frame, housing a throat pipe 2 (used to accelerate air flow and create negative pressure) and a float chamber 3 (for fuel storage). Body 1 is equipped with a first gas nozzle 4 (connected to throat pipe 2 for gas input) and a fuel nozzle 5 (connected to float chamber 3 for fuel replenishment). Float chamber 3 houses a main metering orifice 6. Its lower end communicates with float chamber 3, while its upper end connects to the negative pressure zone (Venturi effect) of throat pipe 2. During normal operation, fuel enters throat pipe 2 through main metering orifice 6 and mixes with air, while first gas nozzle 4 directly enters throat pipe 2 to mix with air.

[0027] Electronic valve structure

[0028] An electronic valve 7 is fixedly mounted at the bottom of the float chamber 3. The electronic valve 7 is a solenoid valve structure and includes a housing 71, a movable iron core 72, a spring 73, and a pin 74. The movable iron core 72 is fixedly connected to the pin 74. The spring 73 is sleeved around the pin 74, with one end abutting against the seat built into the housing of the electronic valve 7 and the other end abutting against the movable iron core 72.

[0029] When the electronic valve 7 is powered off, the spring 73 pushes the moving iron core 72 to move upward, and the pin 74 extends and blocks the lower port of the main metering orifice 6; when the electronic valve 7 is powered on, the coil inside the electronic valve 7 is energized to generate a magnetic field, and the electromagnetic force attracts the moving iron core 72 to move downward, the spring 73 is compressed, the pin 74 retracts, and the lower port of the main metering orifice 6 is opened.

[0030] Negative pressure valve structure

[0031] The negative pressure valve 8 is connected to the side of the float chamber 3 and is equipped with a second gas nozzle 9 (for gas input). A diaphragm cavity 10 is formed within the negative pressure valve 8. A first diaphragm 11 and a second diaphragm 12 are positioned within this cavity along the direction of airflow. These two diaphragms are parallel and adjacent, with their edges sealed to the inner wall of the cavity 10. A valve needle 13 is fixedly connected to the center of the first diaphragm 11, extending axially toward the main metering orifice 6.

[0032] A pinhole 14 is defined in the sidewall of the diaphragm chamber 10 and is coaxially aligned with a side hole 15 in the sidewall of the main metering orifice 6. A spring slot 16 is defined at the inlet end of the pinhole 14 (on the side closest to the diaphragm chamber 10). A compression spring 17 is mounted within this slot. One end of the spring abuts the bottom of the slot, and the other end abuts the top seat of the valve needle 13 (the outer diameter of which is larger than that of the valve needle and serves as a limiter), exerting a rearward force on the valve needle 13.

[0033] A pressure chamber 18 is formed between the second diaphragm 12 and the inner wall of the diaphragm cavity 10. Pressure chamber 18 is connected to an external gas source (combustion gas) via a second gas nozzle 9. Protrusions 19 are provided on the adjacent surfaces of the first diaphragm 11 and the second diaphragm 12, respectively. The two protrusions 19 engage and cooperate to transmit pressure.

[0034] Workflow

[0035] Fuel supply mode:

[0036] After the engine is started, the electronic valve 7 is energized, the pin 74 retracts, and the lower port of the main metering orifice 6 is opened;

[0037] The fuel enters the float chamber 3 through the nozzle 5, enters the negative pressure area of ​​the throat pipe 2 through the main metering orifice 6, and is mixed and atomized with the air entering the throat pipe 2 through the first air nozzle 4 to form a combustible mixture;

[0038] At this time, there is no gas input to the second gas nozzle 9, the pressure chamber 18 of the negative pressure valve 8 is pressureless, the second diaphragm 12 is not pressurized, the valve needle 13 exits the side hole 15 under the action of the compression spring 17, and the main metering orifice 6 is unobstructed.

[0039] Gas supply mode:

[0040] When switching to gas mode, the gas pipeline is divided into two routes: one route enters the throat pipe 2 through the first gas nozzle 4 to directly supply gas, and the other route enters the pressure chamber 18 of the negative pressure valve 8 through the second gas nozzle 9;

[0041] The gas pressure in the pressure chamber 18 pushes the second diaphragm 12 toward the first diaphragm 11. The protrusion 19 of the second diaphragm 12 contacts the protrusion 19 of the first diaphragm 11 and pushes the first diaphragm 11. The first diaphragm 11 drives the valve needle 13 forward. The valve needle 13 passes through the needle hole 14 and the side hole 15, blocking the inner hole of the main metering orifice 6 and cutting off the fuel supply.

[0042] At the same time, the electronic valve 7 can be powered off (or remain powered on), and the state of the pin 74 is not affected because the main metering orifice 6 has been blocked by the valve needle 13.

[0043] Stop or dump protection mode:

[0044] When the engine stops, the electronic valve 7 is de-energized, and the pin 74 extends under the action of the spring 73, blocking the lower end of the main metering orifice 6, cutting off the connection between the float chamber 3 and the throat 2, so that the residual fuel cannot evaporate into the engine compartment;

[0045] When the vehicle tips over, the electronic valve 7 is de-energized by the vehicle tipping sensor (additional circuit connection is required), and the pin 74 quickly blocks the main metering orifice 6, preventing the fuel from continuously flowing into the throat 2 due to gravity, thereby preventing abnormal combustion.

[0046] After adopting the above technical solution,

[0047] 1. Anti-volatilization and anti-explosion: When the fuel is supplied, the engine stops or tilts, the electronic valve is de-energized, and the pin blocks the main metering orifice under the action of the spring, cutting off the connection between the float chamber and the throat, preventing the volatilization of residual fuel, reducing the concentration of combustible gas in the engine compartment, and eliminating the risk of explosion.

[0048] 2. Anti-dumping and oil leakage: When the vehicle dumps during fuel supply, the sensor can trigger the electronic valve to cut off the power (need to cooperate with the vehicle control system), and the pin will quickly block the main metering orifice to prevent continuous fuel supply to the engine, thereby improving safety.

[0049] 3. Automatic fuel switching: When switching to gas, air is supplied to the pressure chamber of the negative pressure valve through the second gas nozzle, and the main metering orifice is automatically blocked by the diaphragm transmission, without manual operation; when the gas is cut off, the spring returns to restore the fuel supply, simplifying the operation process and improving the convenience of use.

Claims

1. A carburetor for preventing gasoline evaporation and spillage, comprising a body (1), wherein the body (1) is provided with a throat (2) and a float chamber (3), wherein the body (1) is provided with a first gas nozzle (4) leading to the throat (2) and an oil nozzle (5) leading to the float chamber (3); wherein the float chamber (3) is provided with a main metering orifice (6) leading to the throat (2); wherein the main metering orifice (6) leading to the throat (2) is provided in the float chamber (3); and wherein the main metering orifice (6) leading to the throat (2) is provided in the main metering orifice (1). An electronic valve (7) is installed at the bottom of the float chamber (3), and the electronic valve (7) includes a retractable pin (74), and the retraction of the pin (74) is used to open or close the lower end of the main metering hole (6). The electronic valve (7) also includes a negative pressure valve (8) connected to the float chamber (3), and the negative pressure valve (8) is provided with a second air nozzle (9); a pinhole (14) leading to the side wall of the main metering hole (6) is provided in the negative pressure valve (8), and a side hole (15) corresponding to the pinhole (14) is opened on the side wall of the main metering hole (6); a diaphragm cavity (14) is formed in the negative pressure valve (8). 0), a first diaphragm (11) and a second diaphragm (12) are arranged adjacent to each other in sequence in the diaphragm cavity (10), a valve needle (13) is fixedly connected to the first diaphragm (11), a spring groove (16) is provided at the inlet end of the needle hole (14), and a compression spring (17) is arranged between the spring groove (16) and the valve needle (13); a pressure cavity (18) communicating with the second air nozzle (9) is formed between the second diaphragm (12) and the inner wall of the diaphragm cavity (10); and the first diaphragm (11) and the second diaphragm (12) are respectively provided with protrusions (19) that contact each other.

2. The carburetor according to claim 1, wherein: The electronic valve (7) further comprises a housing (71), a moving iron core (72) and a spring (73), wherein the moving iron core (72) is fixedly connected to the plug pin (74), and the spring (73) is sleeved on the outside of the plug pin (74), with one end abutting against a seat built into the housing (71) and the other end abutting against the moving iron core (72). When the electronic valve (7) is powered off, the plug pin (74) extends under the action of the spring (73) and blocks the lower end of the main metering orifice (6); when the electronic valve (7) is powered on, the plug pin (74) retracts and opens the lower end of the main metering orifice (6).

3. The carburetor according to claim 1, wherein: The valve needle (13) is guided to telescope along the needle hole (14), and its outer peripheral surface is in contact with the compression spring (17). The compression spring (17) is used to push the valve needle (13) to exit the side hole (15) of the main metering hole (6).

4. The carburetor according to claim 1, wherein: The lower end of the main metering hole (6) is connected to the float chamber (3), and the upper end is connected to the negative pressure area of ​​the throat pipe (2). During normal operation, the fuel enters the throat pipe (2) through the main metering hole (6).

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