Carburetor with good linear low idle speed function for general gasoline engine

Abstract

The invention discloses a general gasoline engine carburetor with a good linear low idle speed function, and relates to the technical field of general engines, the general gasoline engine carburetor comprises a carburetor body, a throttle valve sheet is arranged on the left side of the carburetor body, and a valve sheet screw is fixedly installed at the circle center of the throttle valve sheet; an E-shaped clamping spring is fixedly installed on the left side of the rear end of the carburetor body, a choke valve sheet is arranged on the right side of the carburetor body, a valve sheet screw is fixedly installed at the circle center of the choke valve sheet, a plug is fixedly installed on the right side of the carburetor body, and a pump cover assembly is fixedly installed on the top of the carburetor body. By changing the structure of the throttle valve piece, changing the airflow flowing direction in the idling state and the transition state, balancing the idling state and the transition airflow and improving the oil-gas mixing and atomizing state in the idling state, the idling stability and linearity are improved, an engine can stably run at the lower rotating speed at the idling state, and the engine performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of general engines, in particular to a carburetor for a general gasoline engine with good linear low idle speed function. Background Art

[0002] General-purpose gasoline engines are primarily used in lawn mowers, generators, water pumps, chain saws, hair dryers, and the like. They are widely used due to their simple structure, low cost, and easy maintenance. Carburetors, as key fuel supply components for such engines, have a direct impact on the engine's startability, idle stability, transition smoothness, power output, fuel economy, and emissions. Low idle is a crucial operating condition for general-purpose engines, especially when the equipment is on standby, briefly paused, or undergoing delicate low-speed operation. Good low-idle stability means the engine can operate continuously, smoothly, and reliably at the lowest speed without stalling or wandering, which is crucial for operational convenience and user experience. The following problems exist in the existing technology:

[0003] Because the general engine carburetor with ordinary throttle structure currently used cannot operate stably when the engine is working at a low idle speed. If the idle speed of the engine in the existing market is lower than 1800rpm, the engine will stall, which cannot meet the performance requirements of engines with low idle speed requirements. Summary of the Invention

[0004] The present invention provides a carburetor for a universal gasoline engine with good linear low idle function to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A carburetor for a general gasoline engine with good linear low idle function, comprising a carburetor body, a throttle plate provided on the left side of the carburetor body, a plate screw fixedly installed at the center of the circle of the throttle plate, an E-shaped retaining spring fixedly installed on the left side of the rear end of the carburetor body, a choke plate provided on the right side of the carburetor body, a plate screw fixedly installed at the center of the circle of the choke plate, a plug fixedly installed on the right side of the carburetor body, a pump cover assembly fixedly installed on the top of the carburetor body, a screw 1 fixedly installed on the top of the pump cover assembly, a throttle shaft assembly provided on the front side of the top of the carburetor body, the carburetor A quantitative diaphragm cover is fixedly installed at the bottom center of the carburetor body, and four quantitative diaphragm cover screws are fixedly installed in a rectangular array on the bottom of the carburetor body. The inner cavity of the carburetor body is provided with a needle valve, and the top of the needle valve is connected to a needle valve seat, and the top of the needle valve seat is connected to an oil inlet filter. An oil pump sealing gasket is fixedly installed on the bottom of the pump cover assembly, and an oil pump diaphragm is provided at the bottom of the oil pump sealing gasket. The bottom of the needle valve is connected to a needle valve rocker arm, and a needle valve rocker arm spring is fixedly installed on the top of the needle valve rocker arm. A quantitative diaphragm assembly is fixedly installed on the top of the quantitative diaphragm cover, and a quantitative diaphragm sealing gasket is provided on the top of the quantitative diaphragm assembly.

[0007] A further improvement of the technical solution of the present invention is that: a socket 1 is provided at the front end of the carburetor body, an idle fuel adjustment pin is provided in the inner cavity of the socket 1, an idle fuel adjustment pin spring is sleeved on the outer wall of the idle fuel adjustment pin located in the inner cavity of the socket 1, and an O-ring 2 is sleeved on the outer wall of the idle fuel adjustment pin, and the outer wall of the O-ring 2 is in contact with the inner wall of the socket 1.

[0008] A further improvement of the technical solution of the present invention is that: a through hole 2 is opened at the front end of the carburetor body, and the through hole 2 is located on one side of the through hole 1. A high-speed fuel adjustment pin is clamped in the inner cavity of the through hole 2, and a high-speed fuel adjustment pin spring is sleeved on the outer wall of the high-speed fuel adjustment pin located in the inner cavity of the second socket. An O-ring 1 is sleeved on the outer wall of the high-speed fuel adjustment pin, and the outer wall of the O-ring 1 fits with the inner ring of the second socket.

[0009] A further improvement of the technical solution of the present invention is that an oil inlet pipe is fixedly connected to the upper rear side of the carburetor body, a choke shaft assembly is provided at the lower rear side of the carburetor body, and a throttle return torsion spring is fixedly installed at the front end of the carburetor body.

[0010] A further improvement of the technical solution of the present invention is that a needle valve rocker arm pin is provided on the outer wall of the needle valve rocker arm, a second screw is provided on one side of the needle valve rocker arm, and an expandable blocking piece is provided on one side of the needle valve rocker arm.

[0011] A further improvement of the technical solution of the present invention is that a main nozzle assembly is provided on one side of the expandable plugging piece.

[0012] A further improvement of the technical solution of the present invention is that: the inner cavity of the carburetor body is provided with an accelerator pump piston assembly, the top of the accelerator pump piston assembly is fixedly installed with an accelerator pump return spring, the inner cavity of the carburetor body is provided with a steel ball 1, and the bottom of the steel ball 1 is fixedly installed with a positioning steel ball return spring.

[0013] Due to the adoption of the above technical solution, the present invention has the following technical advancements compared to the prior art:

[0014] 1. The present invention provides a carburetor for a general gasoline engine with good linear low idle function. By changing the structure of the throttle plate, the airflow direction in idle and transition states is changed, the idle and transition airflows are balanced, and the oil-gas mixing and atomization state in the idle state are improved, thereby improving idle stability and linearity, allowing the engine idle speed to run stably at a lower speed and improving engine performance.

[0015] 2. The present invention provides a carburetor for a universal gasoline engine with good linear low idle function. The quantitative diaphragm assembly responds to changes in intake negative pressure and automatically adjusts the fuel output. The needle valve rocker arm links the needle valve through diaphragm displacement to achieve real-time synchronization of fuel supply and intake. The idle fuel adjustment pin and the high-speed fuel adjustment pin accurately control the idle and main operating conditions of fuel supply, respectively. O-rings 1 and 2 are used to ensure sealing, thereby jointly ensuring fuel supply accuracy under all operating conditions and improving fuel economy and emission levels.

[0016] 3. The present invention provides a carburetor for a general gasoline engine with good linear low idle function. Through the accelerator pump piston assembly and the accelerator pump return spring, fuel is instantly replenished during sudden acceleration to avoid acceleration hysteresis; the throttle return torsion spring quickly closes the throttle plate, and at the same time, the boss secondary vortex maintains the airflow inertia to prevent the mixture from being too lean and causing flameout; the main nozzle assembly is fixed by an expandable plug, which optimizes the atomization effect of the main working condition, enhances the carburetor's adaptability to sudden changes in working conditions, and ensures smooth transition. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a left side schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a rear view schematic diagram of the structure of the present invention;

[0019] Figure 3 It is a right side schematic diagram of the structure of the present invention;

[0020] Figure 4 It is a bottom bottom view schematic diagram of the structure of the present invention;

[0021] Figure 5 It is a schematic top view of the structure of the present invention;

[0022] Figure 6 A schematic cross-sectional view of a high-speed fuel adjustment pin according to the present invention;

[0023] Figure 7 A schematic side cross-sectional view of a carburetor body of the present invention;

[0024] Figure 8 A schematic diagram of an expandable plugging piece of the present invention;

[0025] Figure 9 This is a schematic diagram of the main nozzle assembly of the structure of the present invention;

[0026] Figure 10 The figure is a bottom cross-sectional schematic diagram of the carburetor body according to the present invention.

[0027] Figure: 1. Carburetor body; 2. E-shaped retaining ring; 3. O-ring 1; 4. O-ring 2; 5. Pump cover assembly; 6. Metering diaphragm cover; 7. Throttle shaft assembly; 8. Throttle plate; 9. Choke shaft assembly; 10. Choke plate; 11. Needle valve; 12. Needle valve seat; 13. Main nozzle assembly; 14. Expandable plug; 15. Plug; 16. Steel ball 1; 18. Oil pump gasket; 19. Metering diaphragm gasket; 20. Oil pump diaphragm; 21. Metering diaphragm assembly; 22 , quantitative diaphragm cover screw; 23. Screw one; 24. Door plate screw; 25. Screw two; 26. Positioning steel ball return spring; 27. Needle valve rocker arm spring; 28. Accelerator pump return spring; 29. ​​Idle fuel adjustment pin spring; 30. High-speed fuel adjustment pin spring; 31. Throttle return torsion spring; 32. Idle fuel adjustment pin; 33. High-speed fuel adjustment pin; 34. Oil inlet pipe; 35. Oil inlet filter; 36. Needle valve rocker arm pin; 37. Accelerator pump piston assembly; 38. Needle valve rocker arm. DETAILED DESCRIPTION

[0028] The present invention is described in further detail below in conjunction with the embodiments:

[0029] Example 1

[0030] like Figure 1-5As shown, the present invention provides a general gasoline engine carburetor with good linear low idle function, including a carburetor body 1, a throttle plate 8 is provided on the left side of the carburetor body 1, a door plate screw 24 is fixedly installed at the center of the circle of the throttle plate 8, an E-shaped retaining spring 2 is fixedly installed on the left side of the rear end of the carburetor body 1, a choke plate 10 is provided on the right side of the carburetor body 1, a door plate screw 24 is fixedly installed at the center of the circle of the choke plate 10, a plug 15 is fixedly installed on the right side of the carburetor body 1, and the top of the carburetor body 1 A pump cover assembly 5 is fixedly installed, and a screw 23 is fixedly installed on the top of the pump cover assembly 5. A throttle shaft assembly 7 is provided on the top front side of the carburetor body 1. A quantitative diaphragm cover 6 is fixedly installed at the bottom center of the carburetor body 1. Four quantitative diaphragm cover screws 22 are fixedly installed in a rectangular array at the bottom of the carburetor body 1. An oil inlet pipe 34 is fixedly connected to the upper rear side of the carburetor body 1, a choke shaft assembly 9 is provided on the lower rear side of the carburetor body 1, and a throttle return torsion spring 31 is fixedly installed at the front end of the carburetor body 1.

[0031] In this embodiment, the throttle plate 8 is designed with an airflow guide boss to improve idle stability and the linearity of the idle transition state. The outer diameter of the throttle plate 8 ranges from φ1 to φ1000, the boss height ranges from 0.1mm to 1000mm, the boss angle ranges from 0° to 90°, and the throttle plate 8 angle ranges from 0° to 60°.

[0032] Example 2

[0033] like Figure 6-7As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the inner cavity of the carburetor body 1 is provided with a needle valve 11, the top of the needle valve 11 is connected to the needle valve seat 12, the top of the needle valve seat 12 is connected to the oil inlet filter 35, the bottom of the pump cover assembly 5 is fixedly installed with an oil pump sealing gasket 18, the bottom of the oil pump sealing gasket 18 is provided with an oil pump diaphragm 20, the bottom of the needle valve 11 is connected to a needle valve rocker arm 38, the top of the needle valve rocker arm 38 is fixedly installed with a needle valve rocker arm spring 27, the top of the quantitative diaphragm cover 6 is fixedly installed with a quantitative diaphragm assembly 21, the top of the quantitative diaphragm assembly 21 is provided with a quantitative diaphragm sealing gasket 19, the front end of the carburetor body 1 is opened There is a socket one, the inner cavity of the socket one is provided with an idle fuel adjustment pin 32, the outer wall of the idle fuel adjustment pin 32 is sleeved with an idle fuel adjustment pin spring 29, the idle fuel adjustment pin 32 is located in the outer wall of the inner cavity of the socket one and is sleeved with an O-ring 24, the outer wall of the O-ring 24 is in contact with the inner wall of the socket one, the front end of the carburetor body 1 is provided with a through hole 2, the through hole 2 is located on one side of the through hole 1, the inner cavity of the through hole 2 is clamped with a high-speed fuel adjustment pin 33, the outer wall of the high-speed fuel adjustment pin 33 is sleeved with a high-speed fuel adjustment pin spring 30, the outer wall of the high-speed fuel adjustment pin 33 is located in the inner cavity of the socket two and is sleeved with an O-ring 1 3, the outer wall of the O-ring 1 3 is in contact with the inner ring of the socket two.

[0034] In this embodiment, the fuel enters from the oil inlet pipe 34, is filtered through the oil inlet filter 35, the flow is controlled by the needle valve seat 12, and is adjusted by the needle valve 11. The oil pump seal 18 and the oil pump diaphragm 20 are installed in sequence at the bottom of the pump cover assembly 5 to realize pressurized fuel delivery. The quantitative diaphragm assembly 21 and the quantitative diaphragm seal 19 ensure the accuracy of fuel metering. The front end of the carburetor body 1 is provided with a socket 1, which has an idle fuel adjustment pin 32 and an idle fuel adjustment pin spring 29 built in, which are sealed by an O-ring 2 4. The socket 2 has a built-in high-speed fuel adjustment pin 33 and a high-speed fuel adjustment pin spring 30, which are sealed by an O-ring 1 3.

[0035] Example 3

[0036] like Figure 8-10 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the outer wall of the needle valve rocker arm 38 is provided with a needle valve rocker arm pin 36, a screw 25 is provided on one side of the needle valve rocker arm 38, an expandable plug 14 is provided on one side of the needle valve rocker arm 38, a main nozzle assembly 13 is provided on one side of the expandable plug 14, the inner cavity of the carburetor body 1 is provided with an accelerator pump piston assembly 37, the top of the accelerator pump piston assembly 37 is fixedly installed with an accelerator pump return spring 28, the inner cavity of the carburetor body 1 is provided with a steel ball 16, and the bottom of the steel ball 16 is fixedly installed with a positioning steel ball return spring 26.

[0037] In this embodiment, the accelerator pump piston assembly 37 cooperates with the accelerator pump return spring 28 to replenish fuel during sudden acceleration. The needle valve rocker arm 38 controls the opening and closing of the needle valve 11 through the needle valve rocker arm pin 36 and the needle valve rocker arm spring 27. The main nozzle assembly 13 is fixed by the expandable plug 14 to optimize the fuel atomization under the main working condition.

[0038] The working principle of this carburetor for general gasoline engines with good linear low idle speed function is described in detail below.

[0039] like Figure 1-10 As shown, the airflow guide boss of the throttle plate 8 guides the airflow to form a double vortex at low idle speed. The main vortex generates high-speed airflow along the boss slope to enhance fuel atomization. The secondary vortex forms a compensating airflow at the edge of the throttle to balance the idle air supply, thereby improving the uniformity of the oil-gas mixture and allowing the engine idle speed to be stably reduced to below 1800rpm. The choke plate 10 is closed to increase the concentration of the mixed gas; the idle fuel adjustment pin 32 accurately controls the idle fuel supply, and the airflow guided by the boss ensures that the fuel is fully Atomization prevents flameout, the throttle opening is increased, the high-speed fuel adjustment nail 33 adjusts the main oil system supply, the accelerator pump piston assembly 37 instantly replenishes oil to avoid acceleration hysteresis, the throttle reset torsion spring 31 can quickly close the throttle plate 8, the boss auxiliary vortex maintains the airflow inertia to prevent the mixture from being too lean and causing flameout, the quantitative diaphragm assembly 21 can make the diaphragm respond to the change of intake negative pressure and automatically adjust the fuel output. The needle valve rocker arm 38 links the needle valve 11 through the diaphragm displacement to achieve synchronization of fuel supply and intake.

[0040] While the present invention has been generally described above, modifications and improvements are readily apparent to those skilled in the art. Therefore, modifications and improvements that do not depart from the spirit of the present invention are intended to be within the scope of the present invention.

Claims

1. A carburetor for a general gasoline engine with good linear low idle function, comprising a carburetor body (1), characterized in that: The left side of the carburetor body (1) is provided with a throttle plate (8), a plate screw (24) is fixedly installed at the center of the circle of the throttle plate (8), an E-shaped retaining ring (2) is fixedly installed on the left side of the rear end of the carburetor body (1), a choke plate (10) is provided on the right side of the carburetor body (1), a plate screw (24) is fixedly installed at the center of the circle of the choke plate (10), a plug (15) is fixedly installed on the right side of the carburetor body (1), a pump cover assembly (5) is fixedly installed on the top of the carburetor body (1), a screw (23) is fixedly installed on the top of the pump cover assembly (5), a throttle shaft assembly (7) is provided on the front side of the top of the carburetor body (1), a quantitative diaphragm cover (6) is fixedly installed at the center of the bottom of the carburetor body (1), Four quantitative diaphragm cover screws (22) are fixedly installed in a rectangular array at the bottom of the carburetor body (1); a needle valve (11) is provided in the inner cavity of the carburetor body (1); the top of the needle valve (11) is connected to a needle valve seat (12); the top of the needle valve seat (12) is connected to an oil inlet filter (35); an oil pump sealing gasket (18) is fixedly installed at the bottom of the pump cover assembly (5); an oil pump diaphragm (20) is provided at the bottom of the oil pump sealing gasket (18); a needle valve rocker arm (38) is connected to the bottom of the needle valve rocker arm (38); a needle valve rocker arm spring (27) is fixedly installed at the top of the needle valve rocker arm (38); a quantitative diaphragm assembly (21) is fixedly installed at the top of the quantitative diaphragm cover (6); a quantitative diaphragm sealing gasket (19) is provided at the top of the quantitative diaphragm assembly (21).

2. A carburetor for a general gasoline engine with good linear low idle speed function according to claim 1, characterized in that: The front end of the carburetor body (1) is provided with a socket 1, the inner cavity of the socket 1 is provided with an idle fuel adjustment pin (32), the outer wall of the idle fuel adjustment pin (32) is sleeved with an idle fuel adjustment pin spring (29), the outer wall of the idle fuel adjustment pin (32) located in the inner cavity of the socket 1 is sleeved with an O-ring 2 (4), and the outer wall of the O-ring 2 (4) is in contact with the inner wall of the socket 1.

3. A carburetor for a general gasoline engine with good linear low idle speed function according to claim 2, characterized in that: The front end of the carburetor body (1) is provided with a through hole 2, the through hole 2 is located on one side of the through hole 1, the inner cavity of the through hole 2 is clamped with a high-speed fuel adjustment pin (33), the outer wall of the high-speed fuel adjustment pin (33) is sleeved with a high-speed fuel adjustment pin spring (30), the outer wall of the high-speed fuel adjustment pin (33) located in the inner cavity of the second jack is sleeved with an O-ring 1 (3), and the outer wall of the O-ring 1 (3) is in contact with the inner ring of the second jack.

4. A carburetor for a general gasoline engine with good linear low idle speed function according to claim 1, characterized in that: An oil inlet pipe (34) is fixedly connected to the upper rear side of the carburetor body (1), a choke shaft assembly (9) is provided below the rear side of the carburetor body (1), and a throttle return torsion spring (31) is fixedly installed at the front end of the carburetor body (1).

5. A carburetor for a general gasoline engine with good linear low idle speed function according to claim 1, characterized in that: The outer wall of the needle valve rocker arm (38) is provided with a needle valve rocker arm pin (36), one side of the needle valve rocker arm (38) is provided with a second screw (25), and one side of the needle valve rocker arm (38) is provided with an expandable blocking piece (14).

6. A carburetor for a general gasoline engine with good linear low idle speed function according to claim 5, characterized in that: A main nozzle assembly (13) is provided on one side of the expandable plugging piece (14).

7. A carburetor for a general gasoline engine with good linear low idle speed function according to claim 1, characterized in that: The inner cavity of the carburetor body (1) is provided with an accelerator pump piston assembly (37), the top of the accelerator pump piston assembly (37) is fixedly mounted with an accelerator pump return spring (28), the inner cavity of the carburetor body (1) is provided with a steel ball (16), the bottom of the steel ball (16) is fixedly mounted with a positioning steel ball return spring (26).

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