Carburetor

Abstract

The utility model discloses a carburetor which comprises a carburetor body, and a gas inlet chamber, a mixed gas chamber and a throat cavity communicated with the gas inlet chamber and the mixed gas chamber are arranged in the carburetor body. An air throttle assembly is arranged in the mixed gas chamber, a fuel oil cavity and an air inlet pipe communicated with the fuel oil cavity are arranged on the carburetor body, a fuel oil channel is arranged between the fuel oil cavity and the throat cavity, and an idling air supply channel is arranged between the fuel oil cavity and the mixed gas chamber. The end, away from the air inlet cavity, of the throttle valve of the mixed air chamber is provided with an idling main nozzle communicated with the idling air supply channel, the end, facing the fuel oil cavity, of the idling air supply channel is provided with an idling air supply amount hole, the end, located in the throat cavity, of the fuel oil channel is provided with a fuel oil main nozzle, and the end, facing the fuel oil cavity, of the fuel oil channel is provided with a main air inlet amount hole. The idling air supply channel and the fuel oil channel share one fuel oil cavity, so that the structure is simplified, the number of parts is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a carburetor. Background Art

[0002] The carburetor is a mechanical device that mixes a certain proportion of gasoline / liquefied gas with air under the vacuum generated by the engine. As a precision mechanical device, the carburetor plays an important role in the engine and can be called the "heart" of the engine. When the carburetor is working at high speed, the liquefied gas enters the mixing chamber of the carburetor body from the intake pipe, and the air enters the mixing chamber through the choke. The two are mixed in the mixing chamber to form a mixed gas that enters the engine from the throttle.

[0003] The existing carburetor idle air supply channel and fuel channel are designed separately, which may require more seals and joints, and a complex pipeline structure needs to be designed, which has high manufacturing costs and is difficult to manufacture. Based on this problem, the internal structure of the carburetor is optimized. Summary of the invention

[0004] The purpose of the utility model is to provide a carburetor in order to overcome the shortcomings and deficiencies of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a carburetor, comprising a carburetor body, wherein an intake chamber, a mixing chamber and a throat chamber connecting the intake chamber and the mixing chamber are arranged in the carburetor body; a throttle valve assembly is arranged in the mixing chamber, and the throttle valve assembly includes a throttle and a throttle shaft; a fuel chamber and an intake pipe connected to the fuel chamber are arranged on the carburetor body, a fuel channel is arranged between the fuel chamber and the throat chamber, an idle air supply channel is arranged between the fuel chamber and the mixing chamber, an idle main nozzle connected to the idle air supply channel is arranged at one end of the mixing chamber away from the intake chamber by the throttle, an idle air supply amount hole is arranged at one end of the idle air supply channel facing the fuel chamber, a fuel main nozzle is arranged at one end of the fuel channel located in the throat chamber, and a main air intake amount hole is arranged at one end of the fuel channel facing the fuel chamber.

[0006] As a preferred technical solution of the utility model, the carburetor body includes a fuel cap, a fuel cavity is arranged in the fuel cap, and a fuel inlet and an idle inlet are respectively arranged on the fuel cavity to cooperate with the main air intake hole and the idle air replenishment hole.

[0007] As a preferred technical solution of the utility model, the fuel channel is connected to the fuel inlet through a main nozzle, and the main air intake hole is arranged on the main nozzle.

[0008] As a preferred technical solution of the utility model, the main nozzle is coaxially arranged with the fuel channel.

[0009] As a preferred technical solution of the utility model, the idle air supply channel is connected to the idle inlet through the idle nozzle, and the idle air supply hole is arranged on the idle nozzle.

[0010] As a preferred technical solution of the utility model, a transition chamber corresponding to the mixture chamber and a plugging piece for closing the opening above the transition chamber are provided on the carburetor body, the idle air supply channel includes an oblique flow channel connected to the idle nozzle, the end of the oblique flow channel away from the idle nozzle is connected to the transition chamber and a transition hole is formed in the transition chamber, the end of the idle main nozzle away from the mixture chamber is connected to the transition chamber, and the idle main nozzle, the transition chamber, the transition hole and the oblique flow channel constitute the idle air supply channel.

[0011] As a preferred technical solution of the utility model, the idle air replenishment hole and the main air intake hole are arranged side by side.

[0012] As a preferred technical solution of the utility model, it also includes a mounting bracket fixed to the carburetor body and a drive motor connected to the mounting bracket, and the output shaft of the drive motor is connected to the throttle shaft.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the idle air supply channel and the fuel channel share a fuel chamber, which can simplify the design and manufacture of the engine and reduce the production cost by reducing the number of parts; the shared fuel chamber makes the oil circuit system more compact, reduces the risk of leakage, reduces additional seals and oil channel interfaces, and improves the reliability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of one side of the air blocking valve assembly of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the utility model without the fuel cap;

[0016] Figure 3 It is a top view of the utility model;

[0017] Figure 4 It is a cross-sectional view of AA of the utility model;

[0018] Figure 5 It is a cross-sectional view of BB of the utility model;

[0019] Figure 6 It is a cross-sectional view of the utility model CC

[0020] Figure 7 It is a structural schematic diagram of the fuel cap in the utility model;

[0021] Figure 8It is a schematic diagram of the structure inside the fuel cap of the utility model.

[0022] Figure numerals: 1. carburetor body; 2. intake chamber; 3. mixture chamber; 4. throat chamber; 5. throttle valve assembly; 6. throttle valve; 7. throttle shaft; 8. fuel chamber; 9. intake pipe; 10. fuel channel; 11. idle air supply channel; 12. idle main nozzle; 13. idle air supply hole; 14. main air intake hole; 15. fuel cap; 16. fuel inlet; 17. idle inlet; 18. main nozzle; 19. idle nozzle; 20. transition chamber; 21. plug; 22. inclined flow channel; 23. transition hole; 24. mounting bracket; 25. drive motor. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0024] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 8 The carburetor shown in the figure comprises a carburetor body 1, wherein the carburetor body 1 is provided with an intake chamber 2, a mixture chamber 3 and a throat chamber 4 communicating with the intake chamber 2 and the mixture chamber 3; the mixture chamber 3 is provided with a throttle valve assembly 5, the throttle valve assembly 5 comprises a throttle valve 6 and a throttle shaft 7; the carburetor body 1 is provided with a fuel chamber 8 and an intake pipe 9 communicating with the fuel chamber 8; a fuel passage 10 is provided between the fuel chamber 8 and the throat chamber 4, and a fuel passage 10 is provided between the fuel chamber 8 and the mixture chamber 3 An idle air supply passage 11 is provided, and an idle main nozzle 12 connected to the idle air supply passage 11 is provided at the end of the throttle 6 away from the intake chamber 2. An idle air supply hole 13 is provided at the end of the idle air supply passage 11 facing the fuel chamber 8. A fuel main nozzle is provided at the end of the fuel passage 10 located in the throat cavity 4, and a main air intake hole 14 is provided at the end of the fuel passage 10 facing the fuel chamber 8. In this embodiment, the idle air supply hole 13 and the main air intake hole 14 are arranged side by side.

[0026] Sharing a fuel chamber 8 for the idle air supply passage 11 and the fuel passage 10 can simplify the design and manufacture of the engine and reduce the production cost by reducing the number of parts; sharing the fuel chamber 8 makes the oil circuit system more compact, reduces the risk of leakage, reduces additional seals and oil channel interfaces, and improves the reliability of the overall system; due to the sharing of the idle air supply passage 11 and the fuel passage 10, the idle speed control becomes more stable and precise, and when the engine is in the idle state, the fuel in the oil chamber is more evenly distributed, which can help maintain a stable idle speed, thereby improving the stability of the engine at low speeds.

[0027] The carburetor body 1 includes a fuel cap 15, in which a fuel chamber 8 is provided. The fuel chamber 8 is provided with a fuel inlet 16 and an idle inlet 17 which cooperate with the main air intake hole 14 and the idle air replenishment hole 13. In this embodiment, the fuel cap 15 and the carburetor body 1 are connected by fasteners and a sealing gasket is provided between the two.

[0028] The fuel channel 10 is connected to the fuel inlet 16 through the main nozzle 18. The main air intake hole 14 is arranged on the main nozzle 18. The main nozzle 18 and the fuel channel 10 are arranged coaxially. In this embodiment, the fuel channel 10 and the fuel inlet 16 are sealed and connected. A sealing ring can be arranged between the two, and the main nozzle 18 can be installed in the fuel inlet 16 or the fuel channel 10.

[0029] The idle air supply channel 11 is connected to the idle inlet 17 through the idle nozzle 19, and the idle air supply hole 13 is arranged on the idle nozzle 19. In this embodiment, the idle air supply channel 11 and the idle inlet 17 are sealed and connected. A sealing ring can be arranged between the two, and the idle nozzle 19 is installed in the idle air supply channel 11 or the idle inlet 17.

[0030] The carburetor body 1 is provided with a transition chamber 20 corresponding to the mixture chamber 3 and a plug 21 for closing the upper opening of the transition chamber 20. The idle air supply passage 11 includes an oblique flow passage 22 connected to the idle nozzle 19. The end of the oblique flow passage 22 away from the idle nozzle 19 is connected to the transition chamber 20 and a transition hole 23 is formed in the transition chamber 20. The end of the idle main nozzle 12 away from the mixture chamber 3 is connected to the transition chamber 20. The idle main nozzle 12, the transition chamber 20, the transition hole 23 and the oblique flow passage 22 constitute the idle air supply passage 11. When the throttle valve 6 is opened, fuel usually still passes through the idle air supply passage 11, but the flow rate will decrease. Because the throttle valve 6 is opened, the vacuum behind the throttle valve 6 will decrease, and the amount of fuel sucked out of the idle passage will also decrease accordingly. However, in the transition stage, that is, the initial stage when the throttle valve 6 gradually opens from the idle position, the idle air supply channel 11 will still work together with the fuel channel 10 for a period of time to ensure a smooth transition of the mixture and prevent the engine from stalling or stalling. When the throttle valve 6 opening increases, the air flow increases significantly, the vacuum degree in the throat cavity 4 increases, and the main fuel nozzle of the fuel channel 10 will suck out more fuel, which is mixed with a large amount of air to form a thicker combustible mixture to meet the fuel demand of the engine under high load operation.

[0031] It also includes a mounting frame 24 fixed to the carburetor body 1 and a driving motor 25 connected to the mounting frame 24 . The output shaft of the driving motor 25 is connected to the throttle shaft 7 , and the opening of the throttle 6 is controlled by the driving motor 25 .

[0032] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A carburetor, comprising a carburetor body (1), wherein the carburetor body (1) is provided with an intake chamber (2), a mixing chamber (3) and a throat chamber (4) communicating the intake chamber (2) and the mixing chamber (3); wherein the mixing chamber (3) is provided with a throttle valve assembly (5), wherein the throttle valve assembly (5) comprises a throttle valve (6) and a throttle valve shaft (7), wherein: The carburetor body (1) is provided with a fuel chamber (8) and an intake pipe (9) connected to the fuel chamber (8); a fuel passage (10) is provided between the fuel chamber (8) and the throat chamber (4); an idle air supply passage (11) is provided between the fuel chamber (8) and the mixed air chamber (3); an idle main jet (12) connected to the idle air supply passage (11) is provided at one end of the throttle (6) away from the intake chamber (2) of the mixed air chamber (3); an idle air supply hole (13) is provided at one end of the idle air supply passage (11) facing the fuel chamber (8); a fuel main jet is provided at one end of the fuel passage (10) located in the throat chamber (4); and a main air supply hole (14) is provided at one end of the fuel passage (10) facing the fuel chamber (8).

2. The carburetor according to claim 1, characterized in that: The carburetor body (1) comprises a fuel cap (15), a fuel chamber (8) is arranged in the fuel cap (15), and a fuel inlet (16) and an idle inlet (17) are respectively arranged on the fuel chamber (8) to cooperate with the main air intake hole (14) and the idle air supply hole (13).

3. The carburetor according to claim 2, characterized in that: The fuel channel (10) is connected to the fuel inlet (16) through a main nozzle (18), and the main air intake hole (14) is arranged on the main nozzle (18).

4. The carburetor according to claim 3, characterized in that: The main nozzle (18) is coaxially arranged with the fuel channel (10).

5. The carburetor according to claim 2, characterized in that: The idle air supply channel (11) is connected to the idle inlet (17) via an idle nozzle (19), and the idle air supply hole (13) is arranged on the idle nozzle (19).

6. The carburetor according to claim 5, characterized in that: The carburetor body (1) is provided with a transition chamber (20) corresponding to the mixture chamber (3) and a plug (21) for closing the upper opening of the transition chamber (20); the idle air supply passage (11) comprises an oblique flow passage (22) connected to the idle nozzle (19); the end of the oblique flow passage (22) away from the idle nozzle (19) is connected to the transition chamber (20) and a transition hole (23) is formed in the transition chamber (20); the end of the idle main nozzle (12) away from the mixture chamber (3) is connected to the transition chamber (20); the idle main nozzle (12), the transition chamber (20), the transition hole (23) and the oblique flow passage (22) constitute the idle air supply passage (11).

7. The carburetor according to claim 1, characterized in that: The idle air supply hole (13) and the main air intake hole (14) are arranged side by side.

8. The carburetor according to claim 1, characterized in that: It also includes a mounting frame (24) fixed to the carburetor body (1) and a driving motor (25) connected to the mounting frame (24), wherein the output shaft of the driving motor (25) is connected to the throttle shaft (7).

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