Double main jet carburetor applicable to multiple altitude regions

Abstract

The present invention discloses a dual-main orifice carburetor applicable to multiple altitude regions, which includes a carburetor body. A float chamber is formed below the carburetor body by a float cover. A main oil well that is communicated with a throat pipe and used for installing a main jet pipe is formed in the float chamber. A boss is arranged inside the float cover, and a main oil passage, an oil inlet passage and two oil passing passages are arranged in the boss. The main oil passage is communicated with the main oil well, and both of the two oil passing passages are communicated with the main oil passage. A switching valve is arranged outside the float cover, and the switching valve is used to keep the oil inlet passage communicated with one of the two oil passing passages alternatively. The present invention can adjust the oil inlet amount by simply rotating a knob to switch the oil inlet aperture size of the oil inlet passage. The way of adjusting the oil inlet amount has a faster response. By switching the main orifice, the carburetor can meet the requirements of working environments at multiple altitude heights, is safe and efficient, has a low cost, and is suitable for popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of engine components, and particularly relates to a dual-main jet carburetor applicable to multiple altitude regions. Background Art

[0002] A carburetor is a mechanical device that mixes gasoline and air in a certain proportion under the vacuum generated by the operation of an engine. As a precision mechanical device, a carburetor utilizes the kinetic energy of the inhaled air stream to achieve the atomization of gasoline. Its complete device should include a starting device, an idling device, a medium-load device, a full-load device, and an acceleration device. The carburetor automatically mixes the corresponding concentration and outputs the corresponding amount of mixture according to the different working state requirements of the engine. In order to make the mixed mixture relatively uniform, the carburetor also has the effect of atomizing the fuel for the normal operation of the machine.

[0003] Existing gasoline engines and the carburetors they use are generally designed for low-altitude working environments and can only be used in low-altitude working environments. When a gasoline engine is used in a high-altitude area, problems such as insufficient power, unstable operation, black smoke in the exhaust gas, and high fuel consumption are likely to occur. The existing treatment methods generally involve replacing the carburetor or adjusting the air intake. The carburetor is connected to a fuel tank, an air filter, an engine power unit, etc. Therefore, the disassembly and installation of the carburetor are relatively cumbersome. Especially when disassembling and connecting the fuel circuit part of the carburetor, it requires high skills of the operator. Otherwise, safety hazards such as oil leakage are likely to occur after the carburetor is replaced; if the air intake volume of the air intake is adjusted to adjust the carburetor to meet the requirements of the high-altitude working environment, the adjustment of the air intake volume cannot be quantified, so it is very troublesome.

[0004] Therefore, to solve the above problems, a dual-main jet carburetor applicable to multiple altitude regions is needed. By simply turning a knob, the size of the fuel inlet aperture of the fuel inlet passage can be switched to adjust the fuel intake. Different from the traditional method of adjusting the air intake volume to make the carburetor adapt to different altitude working requirements, the method of adjusting the fuel intake has a faster response. By switching the main jet, the carburetor can meet the requirements of multiple altitude working environments, is safe, efficient, low-cost, and suitable for popularization. Summary of the Invention

[0005] In view of this, the object of the present invention is to overcome the defects in the prior art and provide a dual-main orifice carburetor applicable to multiple altitude regions, which can adjust the fuel intake by simply turning a knob to switch the fuel intake aperture size of the fuel inlet passage. Different from the traditional method of adjusting the intake air volume to enable the carburetor to adapt to the working requirements at different altitudes, the method of adjusting the fuel intake has a faster response. By switching the main orifice, the carburetor can meet the requirements of working environments at multiple altitude levels, is safe and efficient, has a low cost, and is suitable for popularization.

[0006] The dual-main orifice carburetor applicable to multiple altitude regions of the present invention includes a carburetor body. A float chamber is formed below the carburetor body by a float cover. A main oil well is formed in the float chamber, which is communicated with a throat pipe and used for installing a main nozzle. A boss is provided inside the float cover. A main oil passage, a fuel inlet passage and two oil passing passages are provided in the boss. The main oil passage is communicated with the main oil well. Both of the two oil passing passages are communicated with the main oil passage. A switching valve is provided outside the float cover. The switching valve is used to keep the fuel inlet passage in selective communication with one of the two oil passing passages. First main orifices and second main orifices with different apertures are provided in the two oil passing passages. The aperture of the first main orifice is used to meet the fuel intake requirement of the carburetor when working at a low altitude. The second main orifice is used to meet the fuel intake requirement of the carburetor when working at a high altitude. A switching operation is carried out between the first main orifice and the second main orifice through a switching valve, which is convenient, reliable, safe and fast.

[0007] Furthermore, the switching valve includes a valve seat, a valve core and a valve cover. The valve seat is fixedly arranged on the float cover. The fuel inlet passage and the two oil passing passages penetrate through the bottom of the valve seat. The valve core is limitedly arranged between the valve seat and the valve cover in a way that it can rotate with a single degree of freedom around its axis (the axis of the valve core is perpendicular to the bottom surface of the valve seat). And an oil guiding groove is provided inside the valve core (that is, the side surface of the valve core in contact with the valve seat), which enables the fuel inlet passage to be selectively communicated with one of the two oil passing passages as the valve core rotates. The fuel inlet direction of the carburetor in this application is from the fuel inlet passage inlet to the oil guiding groove to the oil passing passage provided with the first main orifice / the oil passing passage provided with the second main orifice to the main oil passage to the main nozzle in the main oil well to the throat pipe and is atomized under the drive of air and enters the engine for combustion.

[0008] Furthermore, the fuel inlet passage is constantly communicated with the oil guiding groove, which has a simple structure, reliable and stable fuel inlet, is convenient for adjustment and switching, and the size of the oil guiding groove should be adaptively designed according to the sizes of the two oil passing passages and the through holes at the bottom of the valve seat where the fuel inlet passage penetrates. When the valve core rotates, the fuel inlet passage can be ensured to be selectively communicated with the oil passing passage provided with the first main orifice or the oil passing passage provided with the second main orifice through the oil guiding groove.

[0009] Further, the valve cover is detachably and fixedly connected to the valve seat. A limiting hole is provided on the valve cover. The valve core extends outward along the limiting hole to form a rotating shaft and a limiting block. The rotating shaft is used to drive the valve core to rotate so as to selectively connect the oil inlet passage with the two oil passing passages. The limiting block cooperates with the limiting hole to limit the rotation angle of the valve core, and the shapes of the limiting block and the limiting hole are adapted to each other.

[0010] Further, the main oil passage extends along the protruding direction of the boss. The two oil passing passages are vertically communicated with the main oil passage. The oil passing passages and the main oil passage are both set as straight channels, which improves the fuel passing performance while simplifying the production and processing procedures, and also facilitates the setting of each channel, which is beneficial to the lightweight design and manufacture.

[0011] Further, a sealing assembly is provided between the valve seat and the valve core to ensure the oil passing sealing performance between the valve core and the valve seat and avoid fuel leakage.

[0012] Further, the sealing assembly includes a sealing gasket and a sealing ring. The sealing gasket is embedded in the bottom of the valve seat, and the sealing gasket fits against the inner edge of the valve core to ensure the airtight fit of each stepped contact surface between the valve core and the valve seat.

[0013] Further, positioning posts for the assembly and positioning of the sealing gasket are provided on the bottom surface of the valve seat. The sealing gasket is provided with holes adapted to the shapes of the positioning posts, the oil inlet passage and the two oil passing passages, which is convenient for assembly.

[0014] Further, a first main metering orifice and a second main metering orifice with different flow apertures are provided in the two oil passing passages to meet the oil inlet requirements when working at different altitudes.

[0015] Further, the end of the rotating shaft is connected to a handle for manually operating and rotating the valve core, which is convenient for manually operating and switching the main metering orifice to ensure that the carburetor adapts to the working requirements at different altitudes.

[0016] The beneficial effects of the present invention are as follows: A dual-main metering orifice carburetor applicable to multiple altitude regions disclosed by the present invention can adjust the oil inlet amount by simply rotating a knob to switch the oil inlet aperture size of the oil inlet passage. Different from the traditional method of adjusting the air intake amount to enable the carburetor to adapt to the working requirements at different altitudes, the method of adjusting the oil inlet amount has a faster response. By switching the main metering orifice, the carburetor can meet the requirements of working environments at multiple altitudes, is safe and efficient, has a low cost, and is suitable for popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments:

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 Schematic diagram of the explosion structure of the present invention;

[0020] Figure 3 is Figure 1 front view structure schematic diagram;

[0021] Figure 4 is Figure 3 A - A cross-sectional structure schematic diagram in

[0022] Figure 5 Schematic diagram of the float cover structure of the present invention;

[0023] Figure 6 is Figure 5 side view structure schematic diagram;

[0024] Figure 7 is Figure 6 G - G cross-sectional structure schematic diagram in

[0025] Figure 8 Schematic diagram of the valve core structure of the present invention. Specific implementation manner

[0026] Figure 1 Schematic diagram of the structure of the present invention, Figure 2 Schematic diagram of the explosion structure of the present invention, Figure 3 is Figure 1 front view structure schematic diagram, Figure 4 is Figure 3 A - A cross-sectional structure schematic diagram in Figure 5 Schematic diagram of the float cover structure of the present invention, Figure 6 is Figure 5 side view structure schematic diagram, Figure 7 is Figure 6 G - G cross-sectional structure schematic diagram in Figure 8Schematic diagram of the valve core structure of the present invention. As shown in the figure, the dual-main orifice carburetor applicable to multiple altitude regions in this embodiment includes a carburetor body 1. A float chamber is formed below the carburetor body 1 by a float cover 2. A main oil well 4 that communicates with the throat pipe and is used for installing a main jet pipe 3 is formed in the float chamber. A boss is provided inside the float cover 2, and a main oil passage 5, an oil inlet passage 8, and two oil passing passages 6 are provided in the boss. The main oil passage 5 communicates with the main oil well 4, and both of the two oil passing passages 6 communicate with the main oil passage 5. A switching valve 7 is provided outside the float cover 2. The switching valve 7 is used to keep the oil inlet passage 8 in selective communication with one of the two oil passing passages 6. Different-aperture first main orifices 9a and second main orifices 9b are provided in the two oil passing passages 6. The aperture of the first main orifice 9a is used to meet the fuel inlet volume requirement of the carburetor when operating at low altitude, and the second main orifice 9b is used to meet the fuel inlet volume requirement of the carburetor when operating at high altitude. A switching operation is performed between the first main orifice 9a and the second main orifice 9b through a switching valve 7, which is convenient, reliable, safe, and fast.

[0027] In this embodiment, the switching valve 7 includes a valve seat 71, a valve core 72, and a valve cover 73. The valve seat 71 is fixedly provided on the float cover 2. The oil inlet passage 8 and the two oil passing passages 6 penetrate through the bottom of the valve seat 71. The valve core 72 is limitedly arranged between the valve seat 71 and the valve cover 73 in a manner that can rotate with a single degree of freedom around its axis (the axis of the valve core 72 is perpendicular to the bottom surface of the valve seat 71), and an oil guiding groove 72a is provided inside the valve core 72 (that is, the side surface of the valve core 72 that fits against the valve seat 71) to selectively communicate the oil inlet passage 8 with one of the two oil passing passages 6 as the valve core 72 rotates. The oil inlet direction of the carburetor in this application is from the inlet of the oil inlet passage 8 to the oil guiding groove 72a to the oil passing passage 6 provided with the first main orifice 9a / the oil passing passage 6 provided with the second main orifice 9b to the main oil passage 5 to the main jet pipe 3 in the main oil well 4 to the throat pipe and is atomized under the drive of air and enters the engine for combustion.

[0028] In this embodiment, the oil inlet passage 8 is always in communication with the oil guiding groove 72a, with a simple structure, reliable and stable oil inlet, convenient for adjustment and switching. The size of the oil guiding groove 72a should be adaptively designed according to the sizes of the two oil passing passages 6 and the through holes at the bottom of the valve seat 71 where the oil inlet passage 8 penetrates. When the valve core 72 rotates, the oil inlet passage 8 can be guaranteed to be in selective communication with the oil passing passage 6 provided with the first main orifice 9a or the oil passing passage 6 provided with the second main orifice 9b through the oil guiding groove 72a.

[0029] In this embodiment, the valve cover 73 is detachably and fixedly connected to the valve seat 71. A limiting hole 73a is formed in the valve cover 73. The valve core 72 extends outward along the limiting hole 73a to form a rotating shaft 72b and a limiting block 72c. The rotating shaft 72b is used to drive the valve core 72 to rotate so as to selectively connect the oil inlet passage 8 with the two oil passing passages 6. The limiting block 72c cooperates with the limiting hole 73a to limit the rotation angle of the valve core 72, and the shapes of the limiting block 72c and the limiting hole 73a are adapted to each other.

[0030] In this embodiment, the main oil passage 5 extends along the protruding direction of the boss. The two oil passing passages 6 are vertically connected to the main oil passage 5. The oil passing passage 6 and the main oil passage 5 are both set as straight channels, which improves the fuel passing performance while simplifying the production and processing procedures, and also facilitates the setting of each channel, being conducive to lightweight design and manufacturing.

[0031] In this embodiment, a sealing assembly is arranged between the valve seat 71 and the valve core 72 to ensure the oil passing sealing performance between the valve core 72 and the valve seat 71 and avoid fuel leakage.

[0032] In this embodiment, the sealing assembly includes a sealing gasket 74 and a sealing ring 75. The sealing gasket 74 is embedded in the bottom of the valve seat 71, and the sealing gasket 74 is attached to the inner edge of the valve core 72 to ensure the airtight fit of each stepped contact surface between the valve core 72 and the valve seat 71.

[0033] In this embodiment, positioning posts 71a for the assembly and positioning of the sealing gasket 74 are arranged on the bottom surface of the valve seat 71. Holes adapted to the shapes of the positioning posts 71a, the oil inlet passage 8 and the two oil passing passages 6 are formed in the sealing gasket 74, which is convenient for assembly.

[0034] In this embodiment, a first main metering orifice 9a and a second main metering orifice 9b with different flow apertures are arranged in the two oil passing passages 6 to meet the oil inlet requirements when working at different altitudes.

[0035] In this embodiment, the end of the rotating shaft 72b is connected with a sealing ring 76 for manually operating and rotating the valve core 72, which is convenient for manually operating and switching the main metering orifice and ensures that the carburetor adapts to the working requirements at different altitudes.

[0036] A dual-main metering orifice carburetor applicable to multiple altitude regions disclosed by the present invention can adjust the fuel inlet amount by simply rotating a knob to switch the fuel inlet aperture size of the oil inlet passage 8. Different from the traditional method of adjusting the air intake amount to make the carburetor adapt to the working requirements at different altitudes, the method of adjusting the fuel inlet amount has a faster response. By switching the main metering orifice, the carburetor can meet the requirements of working environments at multiple altitudes, being safe, efficient, low-cost and suitable for popularization.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A dual-main jet carburetor applicable to multiple altitude regions, characterized in that: It includes a carburetor body. A float chamber is formed by a float cover below the carburetor body. A main oil well that communicates with a throat pipe and is used for installing a main jet pipe is formed in the float chamber. A boss is provided on the inner side of the float cover. A main oil passage, an oil inlet passage, and two oil passing passages are provided in the boss. The main oil passage communicates with the main oil well. Both of the two oil passing passages communicate with the main oil passage. A switching valve is provided on the outer side of the float cover. The switching valve is used to keep the oil inlet passage in selective communication with the two oil passing passages. The switching valve includes a valve seat, a valve core, and a valve cover. The valve seat is fixedly provided on the float cover. The oil inlet passage and the two oil passing passages penetrate through the bottom of the valve seat. The valve core is limitedly arranged between the valve seat and the valve cover in a way that it can rotate with a single degree of freedom around its axis. And an oil guiding groove is formed inside the valve core. Rotation of the valve core causes the oil inlet passage to be in selective communication with the two oil passing passages. The oil inlet passage is always in communication with the oil guiding groove. The valve cover is detachably and fixedly connected to the valve seat. A limiting hole is provided on the valve cover. The valve core extends outward along the limiting hole to form a rotating shaft and a limiting block. The rotating shaft is used to drive the valve core to rotate to achieve selective communication between the oil inlet passage and the two oil passing passages. The limiting block cooperates with the limiting hole to limit the rotation angle of the valve core.

2. The dual-main-jet carburetor applicable to multiple altitude regions according to claim 1, wherein: The main oil passage extends along the protruding direction of the boss. The two oil passing passages are vertically communicated with the main oil passage.

3. The dual-main-jet carburetor applicable to multiple altitude regions according to claim 1, characterized in that: A sealing assembly is provided between the valve seat and the valve core to ensure oil passing tightness between the valve core and the valve seat.

4. The dual-main-jet carburetor applicable to multiple altitude regions according to claim 3, wherein: The sealing assembly includes a sealing gasket and a sealing ring. The sealing gasket is embedded in the bottom of the valve seat. The sealing gasket fits against the inner edge of the valve core.

5. The double main jet carburetor applicable to multiple altitude regions according to claim 4, characterized in that: Positioning posts for positioning the assembly of the sealing gasket are provided on the bottom surface of the valve seat. Holes adapted to the shapes of the positioning posts, the oil inlet passage, and the two oil passing passages are formed in the sealing gasket.

6. The double-main-jet carburetor applicable to multiple altitude regions according to claim 1, wherein: First and second main metering orifices with different flow apertures are provided in the two oil passing passages to meet the oil inlet requirements when working at different altitudes.

7. The double-main-jet carburetor applicable to multiple altitude regions according to claim 1, characterized in that: The end of the rotating shaft is connected to a handle for manually operating and rotating the valve core.

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