ADJUSTMENT STRUCTURE AND CARBURETOR

An adjustment structure and carburetor relating to the technical field of carburetors are provided. The adjustment structure includes: a throttle valve, a movable member and a movable member. The throttle valve is provided with an accommodating cavity and a sliding rail arranged in the accommodating cavity. The movable member is arranged in the accommodating cavity and slidably connected to the sliding rail. The rotating member is arranged in the accommodating cavity and threadedly engaged to the movable member, and rotates relative to the movable member and drives the movable member is configured to be driven to slide back and forth along the sliding rail through screws, so as to adjust a height of a jet needle connected with the movable member.

FIELD OF THE DISCLOSURE

The present disclosure relates to the technical field of carburetors, in particular, relates to an adjustment structure and a carburetor.

BACKGROUND OF THE DISCLOSURE

As an important member of vehicles such as motorcycles, the carburetor is mainly used to mix and atomize a certain proportion of fuel with air, so that the mixed fuel after atomization can be fully burned. The carburetor can automatically mix the corresponding concentration of mixed gas according to the needs of different working conditions of the engine, and output the corresponding amount of mixed gas for the engine to burn and do work.

In order to make the motorcycle adapt to different altitudes, temperature and humidity and maintain the normal work of the engine, sometimes it is necessary to adjust the height of the jet needle to adjust the fuel output. However, for adjusting the existing jet needle, the entire throttle valve needs to be removed from the carburetor, which is time-consuming and laborious, and the user experience is poor.

SUMMARY OF THE DISCLOSURE

Due to the aforementioned defects, it is necessary to provide an adjustment structure and a carburetor for the problem that the entire throttle valve needs to be disassembled from the carburetor to adjust the height of the jet needle, which is time-consuming and laborious.

The present disclosure provides an adjustment structure, which includes: a throttle valve provided with an accommodating cavity and a sliding rail arranged in the accommodating cavity; a movable member arranged in the accommodating cavity, in which the movable member is slidably connected to the sliding rail; and a rotating member arranged in the accommodating cavity, in which the rotating member is threadedly engaged to the movable member and rotates relative to the movable member, and the movable member is configured to be driven to slide back and forth along the sliding rail through screw threads, so as to adjust a height of a jet needle connected to the movable member.

The above-mentioned adjustment structure can be applied to a carburetor, and an end of the movable member included in the adjustment structure facing away from the rotating member can be connected to the jet needle. When it is necessary to adjust the height of the jet needle, the rotating member can be rotated relative to the movable member, and the movable member is driven to slide back and forth along the sliding rail through the screw threads, thereby adjusting the height of the jet needle. There is no need to disassemble the entire throttle valve from the carburetor, which saves time and effort and provides a good user experience.

The present disclosure further provides a carburetor, which includes a main body, a jet needle and the adjustment structure as described above. The housing is provided with a float chamber, a fuel outlet channel and an airflow channel. The fuel outlet channel correspondingly and spatially communicates with the float chamber and the airflow channel, one end of the jet needle is connected to the movable member, another end of the jet needle is inserted into the fuel outlet channel, and the rotating member rotates relative to the movable member to drive the jet needle to slide relative to the fuel outlet channel to adjust a fuel outlet space of the fuel outlet channel.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The present disclosure will be described in further detail below in conjunction with the accompanying drawings.

The specific embodiment is only an explanation of the present disclosure, and is not a limitation of the present disclosure. After reading the specification, those skilled in the art can make modifications to the embodiment without creation contribution as required, and as long as they are within the scope of the claims of the present disclosure, they are all protected by the patent law.

Referring toFIG.1, the present disclosure provides a carburetor100, and the carburetor100is used to mix fuel and air and deliver a mixture of the fuel and air to a combustion chamber of a motor vehicle for combustion to drive an engine to do work, and then the engine drives the motor vehicle to run. The motor vehicle can be a motorcycle, etc.

The carburetor100can finely adjust the amount of fuel entering the combustion chamber to maintain the normal work of the engine and provide sufficient power for the motorcycle without using other tools, so that the motorcycle can adapt to various altitudes and temperatures and humidity environment.

Referring toFIG.1, the carburetor100includes an adjustment structure1, a main body2and a jet needle3. The adjustment structure1and the jet needle3are arranged in the main body2, and the jet needle3is connected to the adjustment structure1.

The main body2is provided with a float chamber21, a fuel outlet channel22and an airflow channel23. The fuel outlet channel22correspondingly and spatially communicates with the float chamber21and the airflow channel23. The float chamber21is used to contain fuel, and the carburetor100can generate a negative pressure in the airflow channel23when a piston of the engine reciprocates, so that an external air flows into the airflow channel23to form an airflow. When the air flow flows through the fuel outlet channel22, it drives another negative pressure to be formed in the fuel outlet channel22, and then drives the fuel in the float chamber21to flow to the airflow channel23through the fuel outlet channel22, and the fuel mixes with the air flow in the airflow channel23to form a fuel mixture. After the fuel mixture enters the combustion chamber and burns, it drives the engine to do work so as to drive the motorcycle to run.

The jet needle3is movably inserted in the fuel outlet channel22. The jet needle3is driven by the adjustment structure1to slide relative to the fuel outlet channel22to adjust a fuel outlet space of the fuel outlet channel22. When the fuel outlet space of the fuel outlet channel22varies, an amount of the fuel delivered from the fuel outlet channel22per unit time accordingly varies, and a fuel-air mixing ratio after mixing with the air flow is also different, which results in that the power provided for the motorcycle is also different. In order to make the motorcycle adapt to different environments and different vehicle conditions, it is necessary to use the jet needle3to adjust the fuel outlet space of the fuel outlet channel22, and then adjust the amount of fuel delivered from the fuel outlet channel22per unit time, so that the motorcycle can have sufficient power in different environments and under different vehicle conditions.

Reference is made toFIG.2, which is a schematic structural diagram of the jet needle3. An end of the jet needle3adjacent to the adjustment structure1is defined as a proximal end, and another end of the jet needle3far away from the adjustment structure1is defined as a distal end. The proximal end of the jet needle3has an external thread31, and the external thread31is used for threaded engagement to the adjustment structure1. Certainly, in other embodiments, the jet needle3can also be connected to the adjustment structure1in other ways.

The jet needle3is provided with an oblique notch32, and an area of a cross-section of the jet needle3gradually increases in a direction from the distal end to the proximal end of the jet needle3. The cross section is a plane perpendicular to a central axis of the jet needle3. In a process of withdrawing the jet needle3from the fuel outlet channel22, the proximal end of the jet needle3is disengaged from the fuel outlet channel22, and then the distal end of the jet needle3is disengaged from the fuel outlet channel22. Therefore, when the adjustment structure1drives the jet needle3to gradually disengage from the fuel outlet channel22, the fuel outlet space occupied in the fuel outlet channel22by the jet needle3becomes smaller, so that the fuel outlet space of the fuel outlet channel22becomes larger. When the adjustment structure1drives the jet needle3to gradually insert into the fuel outlet channel22, the fuel outlet space occupied in the fuel outlet channel22by the jet needle3becomes larger, so that the fuel outlet space of the fuel outlet channel22becomes smaller. The structure of the jet needle3can more finely adjust the fuel outlet space of the fuel outlet channel22, so that the amount of fuel outlet can be adjusted more finely.

The jet needle3used in the present disclosure is shorter in length. Compared with the jet needle3having a longer length, the jet needle3having a shorter length is less affected by internal stress during production and processing, and the jet needle3is not easily deformed, thereby ensuring a tightness of the jet needle3. When the jet needle3is fully inserted into the fuel outlet channel22, it can completely seal the fuel outlet channel22to avoid fuel leakage. In addition, when the jet needle3slides up and down relative to the fuel outlet channel22, a stuck phenomenon can be prevented.

Referring toFIG.3andFIG.4, the adjustment structure1includes a throttle valve11, a movable member12, a rotating member13, a connecting member14and a return member15. The movable member12, the rotating member13and the connecting member14are all arranged in the throttle valve11, and two ends of the connecting member14are respectively threadedly engaged to the movable member12and the rotating member13.

Referring toFIG.5, the throttle valve11is provided with an accommodating cavity111for accommodating the movable member12and the rotating member13. The accommodating cavity111includes a first cavity1111, a second cavity1112and a clamping slot1113that spatially communicate with each other in sequence, and a diameter of the first cavity1111is smaller than a diameter of the second cavity1112. The first cavity1111is used for mounting of the movable member12, and the second cavity1112is used for mounting of the rotating member13. A radial dimension of the rotating member13is larger than the diameter of the first cavity1111, so that the rotating member13can always stay in the second cavity1112.

The clamping slot1113is used for mounting a spring, and the spring can limit the rotating member13arranged in the second cavity1112to prevent the rotating member13from disengaging from the second cavity1112.

Referring toFIG.5andFIG.6, a cavity wall of the first cavity1111is correspondingly provided with two sliding slots1114, and the two sliding slots1114are arranged opposite to each other to form a sliding rail for the movable member12to slide up and down. Certainly, in other embodiments, a number of the sliding slots1114can also be other numbers, such as one or three or more than three, which is not limited herein.

A limiting step1115is further provided in the accommodating cavity111, and the limiting step1115is used to limit a position of the return member15, and in addition, the limiting step1115is provided with an open through which the jet needle3passes.

The throttle valve11is further provided with a screw hole1116, and a limiting screw can pass through the screw hole1116, so that the limiting screw can limit a position of the rotating member13arranged in the second cavity1112. The limiting screw may be a Pozi screw commonly used in the field.

Referring toFIG.1andFIG.4, each of two sides of the throttle valve11is provided with an engaging slot112, and the engaging slots112can be correspondingly engaged to the main body2, so that the throttle valve11can slide relative to the main body2, thereby adjusting a blocking area of the throttle valve11in the airflow channel23.

Referring toFIG.3, the connecting member14includes a fixing base141, a first stud142, and a second stud143that are integrally formed. The first stud142and the second stud143are arranged on opposite sides of the fixing base141. The first stud142is used for being threadedly engaged to the movable member12, and the second stud143is used for being threadedly engaged to the rotating member13.

Referring toFIG.3, two sides of the movable member12are respectively provided with two flanges121, and the two flanges121are respectively engaged to the two sliding slots1114, so that the movable member12can slide back and forth in the first cavity1111.

The movable member12is penetrated with a first threaded hole122, and the first threaded hole122is threadedly engaged to the first stud142. In addition, an end of the first threaded hole122facing away from the first stud142is threadedly engaged to the jet needle3.

Referring toFIG.3andFIG.7, the rotating member13is penetrated with a second threaded hole131, and the second threaded hole131is threadedly engaged to the second stud143. In addition, a hexagonal driving slot132is provided on a side of the rotating member13facing away from the movable member12, and the hexagonal driving slot132can be engaged to a hexagonal wrench, so that the hexagonal wrench drives the rotating member13to rotate, which is convenient to operate. Certainly, in other embodiments, the hexagonal driving slot132can also be replaced by other structural slots, such as non-circular slots or irregular slots such as slots, cross slots, triangular slots, and flat slots, which is not limited herein.

A circumferential side wall of the rotating member13is provided with a plurality of limiting slots133, and each of the plurality of limiting slots133can be engaged to a limiting screw for damping, so that the limiting screw limits the rotation of the rotating member13relative to the movable member12to prevent the rotating member13from rotating accidentally. When the rotating member13needs to be rotated, a greater force can be applied to the rotating member13to overcome a resistance of the limiting screw applied to the rotating member13to drive the rotating member13to rotate relative to the movable member12.

The rotating member13can be made of a metal material or a high-strength plastic material, so that when the limiting screw is switched and engaged to different one of the plurality of limiting slots133of the rotating member13, there will be an obvious click sound between the limiting screw and the rotating member13. When a user drives the rotating member13to rotate, the user can listen to the sound in real time. One sound means that the rotating member13rotates by a unit angle, and the unit angle is an angle formed between two adjacent limiting slots133. It should be noted that the plurality of limiting slots133provided on the rotating member13are distributed at an equal angle, which is convenient for the user to finely adjust the rotating member13. A number of the plurality of limiting slots133in the embodiment shown inFIG.7is ten, so the unit angle is 36°. During the rotation of the rotating member13, when the user hears one sound, it means that the rotating member13has been rotated by 36°. Certainly, in other embodiments, the number of the limiting slots133can also be other numbers, such as twelve, which is not limited herein.

The adjustment structure1further includes a return member15. The return member15in the embodiment shown inFIG.3is a return spring, and the return spring is sleeved on an outer wall of the movable member12. One end of the return spring abuts against the limiting step1115, and another end of the return spring abuts against the movable member12. When the rotating member13rotates relative to the movable member12and drives the movable member12to slide against the rotating member13, the movable member12presses against the return spring, driving the return spring to accumulate elastic force. The return spring can also release the elastic force to press against the movable member12, so that the movable member12and the rotating member13are maintained in a tightly-engaged state.

When it is necessary to reduce the fuel injection concentration of the carburetor, the rotating member13can be controlled to rotate in the opposite direction, the rotating member13drives the movable member12to slide against the rotating member13through threaded cooperation, and the movable member12drives the jet needle3to gradually insert into the fuel outlet channel22, so as to reduce the fuel outlet area of the fuel outlet channel22.

When it is necessary to increase the fuel injection concentration of the carburetor, the rotating member13can be controlled to rotate in the forward direction, and the rotating member13drives the movable member12to slide toward the rotating member13through threaded cooperation, and the movable member12drives the jet needle3to gradually move away from the fuel outlet channel22, so as to increase the fuel outlet area of the fuel outlet channel22.

Referring toFIG.8andFIG.9, the carburetor100further includes an adjustment assembly4, and the adjustment assembly4is used to control the rotation of the rotating member13, so that the rotating member13is controlled to drive the movable member12to slide back and forth.

The adjustment assembly4includes a cover plate41, an adjustment member42and an elastic member43. The adjustment member42is slidably and rotatably connected to the cover plate41, and can rotate and slide relative to the cover plate41. The elastic member43is sleeved on the adjustment member42, and two ends of the elastic member43respectively abut against the cover plate41and the adjustment member42.

The cover plate41is provided with a plurality of mounting holes411, and the plurality of mounting holes411can be used for screw penetration, so that the screws are threadedly engaged to the main body2, so as to fix the adjustment assembly4on the main body2, thereby facilitating the adjustment member42to control the rotation of the rotating member13.

The adjustment member42includes a base421, a rod body422and a control cap423. Two ends of the rod body422are respectively connected to the base421and the control cap423. An end of the rod body422adjacent to the base421passes through the cover plate41, and the end is a regular hexagonal prism, which is used for engaging to the hexagonal driving slot of the rotating member13. The user can push the control cap423, and the control cap423drives the rod body422to move toward the rotating member13, so that the end of the rod body422is fittingly engaged to the hexagonal driving slot of the rotating member13, and then the user can rotate the control cap423to drive the rotating member13to rotate.

When the control cap423slides toward the rotating member13, the control cap423presses against the elastic member43to drive an elastic force to be accumulated in the elastic member43. When it is not necessary to drive the rotating member13to rotate, the elastic member43drives the control cap423and the rod body422to move away from the rotating member13, so that the rod body422is disengaged from the hexagonal driving slot of the rotating member13for safety purpose.

The base421is provided with a groove, the elastic member43abuts against a bottom of the groove, and the groove can limit a position of the elastic member43.

When the fuel outlet space of the fuel outlet channel22of the present disclosure is adjusted, it only needs to manually adjust the control cap423and the height of the jet needle, and it is not necessary to disengage the entire throttle valve from the carburetor, which saves time and effort and provides a good user experience.

Referring toFIG.10, in an alternative embodiment, the connecting member14can be replaced with a longer screw rod, and the screw rod and the rotating member13are integrally formed. A thickness of the rotating member13can be reduced, a thickness of the movable member12can be increased, and the screw rod is threadedly engaged to the first threaded hole122of the movable member12. When the adjustment assembly4drives the rotating member13to rotate, the rotating member13drives the screw rod to rotate, and the screw rod is threaded to drive the movable member12to slide up and down, so that the height of the jet needle3can also be adjusted. Compared with the above-mentioned embodiments, the present embodiment provides a simpler structure that is more convenient to use.

Referring toFIG.11, in a feasible embodiment, the throttle valve11is provided with a first guiding surface113and a second guiding surface114. The first guiding surface113and the second guiding surface114are connected and transitioned to each other.

The first guiding surface113is an arc surface, and an arc of the arc surface is not limited. For example, it can be one radian to two radians. The arc of the first guiding surface113in the embodiment shown inFIG.11is one radian. Certainly, other radians may also be used, which is not limited herein.

In an air intake direction of the airflow channel23, the first guiding surface113and an axial direction of the airflow channel23have an included angle therebetween, and the included angle is 60°. Certainly, the included angle can also be other angles, such as 45°, 70°, etc., which is not limited herein. In addition, a radial dimension of the first guiding surface113decreases gradually, so that the air flow passing through the first guiding surface113will not form strong air turbulence through a guiding effect of the first guiding surface113. The radial dimension of the first guiding surface113is a distance between the first guiding surface113and the central axis of the airflow channel23. Furthermore, in the air intake direction of the airflow channel23, an area of the first guiding surface113decreases gradually, such that it is more beneficial for alleviating an air turbulence.

Referring toFIG.11, the second guiding surface114is connected to an end of the first guiding surface113having a smallest radial dimension, and the second guiding surface114is another arc surface. An arc of the another arc surface is not limited. For example, it can be one radian to two radians. The radian of the second guiding surface114in the embodiment shown inFIG.11is 1.2 radians. Certainly, other radians may also be used, which is not limited herein.

In addition, in the air intake direction of the airflow channel23, a radial dimension of the second guiding surface114decreases gradually.

The air flow entering the airflow channel23flows through the first guiding surface113and the second guiding surface114in sequence. Because in the air intake direction of the airflow channel23, the radial dimension of the first guiding surface113and the radial dimension of the second guiding surface114are both decreasing, so the air flow can pass through the first guiding surface113and the second guiding surface114smoothly, so that an influence of the throttle valve11on the air flow can be minimized, and a flow velocity of the air flow through the fuel outlet channel22is relatively increased, which can form a relatively large negative pressure on the fuel outlet channel22and drive more fuel to be ejected from the fuel outlet channel22, and the mixture mixed with the air flow contains more fuel. After the mixture flows into the combustion chamber and burns, a stronger power for the engine can be provided.

Referring toFIG.11, each of two sides of the throttle valve11is provided with a guiding slot115, and the guiding slots115are used for sliding connection with the main body11, so that the throttle valve11can slide up and down relative to the main body2to adjust an unobstructed area of the airflow channel23. The larger the unobstructed area is, the larger the air flow volume of the airflow channel23is, and vice versa. In a preferred state, the first guiding surface113of the throttle valve11is just completely positioned at the airflow channel23. At this moment, a vertical side wall of the throttle valve11is not located in the airflow channel23, the air flow flowing in the airflow channel23will basically not form the air turbulence on the throttle valve11, the flow velocity of the air flow flowing through the fuel outlet channel22is greater, the power of sucking fuel is more sufficient, and more fuel can be sucked and mixed with the air flow, so that more sufficient power can be provided to the engine after combustion.

Referring toFIG.12, an air intake portion of the main body2includes a first main body24and a second main body25that are connected with each other, and the first main body24and the second main body25are integrally formed. In the air intake direction of the airflow channel23, a radial dimension of the first main body24decreases gradually, and a shape is similar to a trumpet mouth.

Reference is made toFIG.13, in whichFIG.13shows a schematic contour of a corresponding channel of the second main body25. An inner wall of the second main body25includes a first arc surface251and a second arc surface252, and a diameter of the second arc surface252is smaller than a diameter of the first arc surface251. In a process of gradually unblocking the airflow channel23, the throttle valve11passes through the second arc surface252having the smaller diameter, and then passes through the first arc surface251having the larger diameter. When the engine is in a low-speed state, the throttle valve11passes through the second arc surface252, the unobstructed area of the airflow channel23does not change very much, and a reduction of the negative pressure of the airflow channel23will not be very fast. A pressure difference at the air inlet of the airflow channel23is relatively large, so that a flow rate of the air flow entering the airflow channel23is relatively high, resulting in that the atomization effect on the fuel is better, the fuel can be fully burned, and the exhaust gas emitted by the fuel after combustion is less, which is conducive to environmental protection and can provide sufficient power for the engine even at low engine speeds.

Referring toFIG.14, the carburetor100further includes an extension tube5and a packaging assembly6. One end of the extension tube5is connected to the main body2, the extension tube5spatially communicates with the float chamber21, and another end of the extension tube5is connected to the packaging assembly6.

The packaging assembly6can be switched between a closed state and an open state. When the packaging assembly6is in the closed state, the fuel in the float chamber21cannot flow to an outside. When the packaging assembly6is in the open state, the fuel in the float chamber21can flow to the outside through the extension tube5and the packaging assembly6. After the motorcycle rides through water, it is easy to cause water to enter the carburetor structure100, and in severe cases, the fuel cannot be fully burned. Therefore, it is necessary to switch the packaging assembly6to the open state to discharge the fuel with water to the outside, so that the fuel can be fully burned to drive the engine to work normally.

The packaging assembly6includes a first connecting member61and a second connecting member62. The second connecting member62is connected to the another end of the extension tube5away from the float chamber21. The first connecting member61can move relative to the second connecting member62, so that the packaging assembly1can be switched between the closed state and the open state.

There are certain ways to movably connect the first connecting member61and the second connecting member62, such as threaded connection, buckle connection and the like. Referring toFIG.15, the first connecting member61and the second connecting member62are threadedly engaged to each other, so that the first connecting member61and the second connecting member62can be tightly connected or detached. When the first connecting member61and the second connecting member62are disassembled and separated, the packaging assembly1is in the open state, and the fuel can be discharged to the outside through the extension tube5and the second connecting member62. When the first connecting member61and the second connecting member62are sealed and connected, the packaging assembly6is in the closed state, and the first connecting member61blocks the second connecting member62to prevent fuel from being discharged to the outside through the second connecting member62.

The first connecting member61includes a rotating handle611, a screw thread612and a sealing post613that are integrally formed. The screw thread612is arranged between the rotating handle611and the sealing post613. The user can manually rotate the rotating handle611to drive the screw thread612to be threadedly connected to the second connecting member62, so that the sealing post613seals the second connecting member62.

The sealing post613is tapered, and a diameter of the sealing post613decreases gradually along a direction from the rotating handle611to the screw thread612, so as to allow the sealing post613to seal the second connecting member62.

Referring toFIG.16, the second connecting member62includes a first section621and a second section622. The first section621and the second section622are integrally formed. A connecting screw hole6211is provided in the first section621, and the connecting screw hole6211is used for threaded engagement with the first connecting member61, so that the first connecting member61and the second connecting member62can be threadedly engaged to each other or detached.

The second section622is used for connecting the extension tube5, and an outer diameter of the second section622is smaller than an outer diameter of the first section621so as to limit the extension tube5. A step hole6221is provided in the second section622, and a diameter of the step hole6221is smaller than a diameter of the connecting screw hole6211. The step hole6221can be blocked or unblocked by the sealing post613of the first connecting member61. When the sealing post613blocks and seals the step hole6221, the fuel cannot flow out of the second connecting member62. When the first connecting member61is separated from the second connecting member62and the sealing post613does not block the step hole1121, the fuel can flow to the outside from the second connecting member62.

An outer wall of the second section622is provided with a plurality of annular grooves6222that are spaced with each other, so that the second section622has a plurality of annular flanges6223formed thereon. The extension tube5is sleeved on the second section622and abuts against the annular flanges6223so as to make the connection between the extension tube5and the second section622stable and not easy to fall off. Certainly, in order to make the connection between the extension tube5and the second section622more stable, an iron wire can even be tied outside the extension tube5.

The packaging assembly6further includes a sealing ring63, and the sealing ring63is sleeved on the first connecting member61. When the first connecting member61and the second connecting member62are screwed together, the first connecting member61and the second connecting member62can press against the sealing ring63to further improve the sealing between the first connecting member61and the second connecting member62, so as to prevent accidental outflow of fuel.

The extension tube5can be made of a plurality of bent hard metal tubes, or it can be a soft material hose. The extension tube5of the embodiment shown inFIG.14is a plastic hose, and the plastic hose can be easily deformed to adjust the position of the fuel outlet to facilitate the discharge of fuel. Even if there are various complex parts blocking near the junction of the extension tube and the main body2, the extension tube5can shuttle freely to adjust the position of the fuel outlet to a suitable position to discharge the fuel. A length of the extension tube5is not limited. Even if the other structures of the carburetor100are complicated, the another end of the extension tube5away from the float chamber21can be passed out to a convenient position for operation.

Referring toFIG.14, the main body2is provided with a balance hole28, and the balance hole28correspondingly and spatially communicates with the float chamber21and the outside of the main body2, so that the float chamber21communicates with the atmosphere outside the main body2. When the airflow channel23has the air flow passing through the fuel outlet channel22, the air flow forms a negative pressure on the fuel outlet channel22. The float chamber21communicates with the atmosphere, so it will not affect the flow of fuel in the float chamber21into the fuel outlet channel22, and the fuel can smoothly flow to the airflow channel23through the fuel outlet channel22.

Referring toFIG.17, the main body2of the embodiment shown inFIG.17is provided with an air pressure channel27, and the air pressure channel27is arranged adjacent to the air flow channel23. When the air flow passes through the airflow channel23, a part of the air will crash into the air pressure channel27and enter the float chamber21, and an air pressure in the float chamber21will gradually increase. When the air pressure in the float chamber21increases to a certain extent, the air pressure drives the fuel in the float chamber21to flow to the airflow channel23through the fuel outlet channel22. At the same time, during the flow of the air flow in the airflow channel23, according to Bernoulli's law, one negative pressure will be generated inside the air flow, and another negative pressure will be formed in the fuel outlet channel22. Under the double action of negative pressure and positive pressure, the fuel outlet channel22enables the fuel in the float chamber21to flow to the airflow channel23with a faster flow speed and more flow amount. Air flow and more fuel into the combustion chamber provide more power to the engine.

The air pressure channel27includes two channels that are perpendicular to each other, so that the air flow can flow into the float chamber21more smoothly when entering the air pressure channel27. In addition, the air pressure channel27of the present embodiment is closer to the airflow channel23, so that the air flow flowing into the air pressure channel27per unit time increases, which can quickly form a larger air pressure on the float chamber21and drive the fuel into the fuel outlet channel22, and then enter the airflow channel23through the fuel outlet channel22. Certainly, in other embodiments, the two channels of the air pressure channel27perpendicular to each other can also be arranged at other angles, which is not limited herein.

Referring toFIG.18, in order to make the adjustment of the fuel outlet of the carburetor100more precise, a control member7can be disposed in the carburetor100. The control member7is threadedly engaged to the main body2and can rotate relative to the main body2to adjust a circulation space between the fuel outlet channel22and the float chamber21, thereby adjusting a maximum fuel outlet amount of the fuel outlet channel22. When the circulation space is larger, under the same negative pressure, a maximum amount of fuel flowing into the fuel outlet channel22from the float chamber21per unit time increases, and the amount of fuel flowing into the airflow channel23accordingly increases. When the circulation space is smaller, under the same negative pressure, the maximum amount of fuel flowing into the fuel outlet channel22from the float chamber21per unit time decreases, and the amount of fuel flowing into the airflow channel23accordingly decreases.

A part of the main body2adjacent to the fuel outlet channel22is provided with a mounting channel26, and the control member7is threadedly engaged to the mounting channel26. One end of the control member7adjacent to the fuel outlet channel22is provided with a flow limiting portion71, and another end of the control member7is provided with an insertion slot72. The user can insert a screwdriver into the insertion slot72, and drive the control member7to rotate through the screwdriver to make the flow limiting portion71move back and forth in the fuel outlet channel22, so that the flow limiting portion71adjusts the circulation space between the fuel outlet channel22and the float chamber21.

The flow limiting portion71of the embodiment shown inFIG.19is in the shape of a cone. A longitudinal section of the flow limiting portion71is circular, and the longitudinal section is a plane perpendicular to a central axis of the flow limiting portion71.

Referring toFIG.20, in other embodiments, the flow limiting portion71may also be a cylinder with an oblique notch73, which is not limited herein. When the flow limiting portion71moves toward the fuel outlet channel22, the flow limiting portion71gradually blocks the fuel outlet channel22, and the fuel outlet space of the fuel outlet channel22becomes smaller. When the flow limiting portion71moves away from the fuel outlet channel22, the flow limiting portion71gradually unblocks the fuel outlet channel22, and the fuel outlet space of the fuel outlet channel22becomes larger. Such an adjustment method can completely replace the adjustment of the main metering hole and the auxiliary metering hole of the traditional carburetor. Usually, when people adjust the main metering hole and the auxiliary metering hole of the traditional carburetor, they must remove the carburetor's float chamber for the replacement of the screws of the main metering hole and the auxiliary metering hole. The replacement is time-consuming and labor-intensive. The improved adjustment method does not need to disassemble the float chamber, and can directly adjust the fuel outlet more accurately without any tools.

Referring toFIG.19, a sealing ring74and a return spring75are sleeved on the control member7. The sealing ring74is made of rubber or silicone material, and an outer wall of the sealing ring74abuts against an inner wall of the mounting channel26, so that the control member7is not easy to be separated from the mounting channel26, and a function of isolating air, liquid and dust is therefore provided. In addition, the sealing ring74can also prevent the fuel from the float chamber21from leaking out.

The return spring75is always in a compressed state, so that the return spring75can always apply another elastic force to the control member7to drive the control member7to be in a tensioned state. In a natural state, the control member7is not easy to accidentally rotate to misadjust the fuel outlet space of the fuel outlet channel22, which improves the safety of use.

Referring toFIG.21toFIG.28, in other embodiments, those can be used as the control device of part B inFIG.18. The control member7includes a first adjustment member76, a second adjustment member77and a third adjustment member78. The first adjustment member76has a first end portion and the second end portion that are opposite to each other. The first end portion is provided with the flow limiting portion71, and the second end portion is detachably connected to the third adjustment member78. An outer surface of the second adjustment member77is provided with a first external thread771. The second adjustment member77has a through hole772, and the through hole772correspondingly and spatially communicates with two ends of the second adjustment member77that are opposite to each other. The third adjustment member78has a third end portion and a fourth end portion that are opposite to each other. The third end portion and an end of the second adjustment member77adjacent to the third adjustment member78are connected to each other through a mortise and tenon structure, and a first return member762is sleeved on the first adjustment member76.

The control member7can be used to adjust a fuel outlet rate of the carburetor100. Specifically, the mortise and tenon structure includes a tenon781and a mortise783, and there are one or more mortises781and mortises783that match each other. In the present embodiment, there are two mortises781and mortise grooves783. When in use, the user can pull the third adjustment member78outward, and the third adjustment member78drives the first adjustment member76to move outward, thereby making the flow limiting portion71move outwards. At this time, the tenon781escapes from the mortise783, and then the third adjustment member78is rotated to displace the tenon781and the mortise783. At this time, the first return member762correspondingly acts on the flow limiting portion71and the second adjustment member77to push the flow limiting portion71and the second adjustment member77toward a direction away from each other, so that the tenon781is pressed against the end of the second adjustment member77adjacent to the third adjustment member78, so as to ensure that the fuel outlet rate of the carburetor100will not be too high. When it is necessary to return the control member7, the third adjustment member78is rotated so that the tenon781faces the mortise783, and since the first return member762acts on the flow limiting portion71and the second adjustment member77, the tenon781is inserted inside the mortise783, and the longitudinal cross-sectional area of the flow limiting portion71decreases gradually, so the flow limiting portion71can adjust the fuel outlet area of the carburetor100during its activity. This method can facilitate the user to return the control member7to the original position, which ensures that the fuel outlet rate of the carburetor100can be quickly restored, and is convenient to use and saving time and effort. This design can also completely replace the choke valve design of the traditional carburetor and achieve more accurate fuel enrichment, and it is not easy to wet a spark plug during cold start and is very easy to cold start.

As shown inFIG.21orFIG.22, the flow limiting portion71is conical, and the longitudinal section of the flow limiting portion71is circular. The flow limiting portion71can adjust the fuel outlet area of the carburetor100, and in a direction from the second end portion to the first end portion, the longitudinal section area of the flow limiting portion71decreases. Specifically, the longitudinal section is a plane perpendicular to the central axis of the flow limiting portion71.

As shown inFIG.21toFIG.23, a tail end of the flow limiting portion71and an inner wall of the through hole772are respectively provided with a first mounting seat763and a second mounting seat773, and two ends of the first return member762respectively act on the first mounting seat763and the second mounting seat773. Further, the first return member762can be a spring, and two ends of the spring respectively act on the first mounting seat763and the second mounting seat773. When there is no need to adjust the fuel outlet rate of the carburetor100, since the spring is used to push the flow limiting portion71and the second adjustment member77toward a direction away from each other, the tenon781will be pressed against the mortise783, which can increase the stability of the control member7and prevent the fuel outlet rate of the carburetor100from changing due to the deviation of the tenon781when the fuel outlet rate of the carburetor100does not need to be adjusted. In addition to the spring103, the first return member762can also be replaced by two magnetic attractors. One magnetic attractor is disposed on the first mounting seat763, and another magnetic attractor is disposed on the second mounting seat773. When the first adjustment member76is moving, a distance between the two magnetic attractors approaches or moves away to accumulate a magnetic force or release the magnetic force, which can also achieve the same effect as a spring.

As shown inFIG.21toFIG.25, the control member7further includes a sealing ring74, and the second adjustment member77is provided with a mounting slot774along a circumferential direction. The sealing ring74is sleeved on the second adjustment member77and arranged in the mounting slot774. Specifically, the sealing ring74is made of rubber or silica gel material, and the outer wall of the sealing ring74abuts against the inner wall of the mounting channel26of the carburetor100, so that the control member7is not easy to be separated from the carburetor100and plays a role of sealing air.

As shown inFIG.21toFIG.25, the control member7further includes a second return member775sleeved on the outer surface of the second adjustment member77.

As shown inFIG.21toFIG.25, the outer surface of the second end portion is provided with a second external thread761, and the third end portion is provided with a third threaded hole783matching the second external thread761.

Further, the second external thread761can be threadedly engaged to the third threaded hole783, so that the second end portion and the third end portion can be detachably connected to each other.

As shown inFIG.21toFIG.25, the fourth end portion is provided with an insertion slot72, which can be fittingly engaged to an external tool, so that the external tool can drive the adjustment member to rotate. The user can use the screwdriver to engage with the insertion slot72, and rotate the screwdriver to make the third adjustment member78rotate. The third adjustment member78drives the second adjustment member77to rotate through a cooperation of the tenon781and the mortise783, and the second end portion of the first adjustment member76is detachably connected to the third adjustment member78. Therefore, when the third adjustment member78rotates, the first adjustment member76is driven to rotate simultaneously, so as to control the movement of the flow limiting portion71to the carburetor100, and the fuel outlet rate of the carburetor100is adjusted.

As shown inFIG.21toFIG.28, an outer surface of the third adjustment member78is provided with anti-slip patterns784. Further, the user can also manually operate the control member7. Specifically, the user can use fingers to pinch the third adjustment member78to drive the entire control member7to rotate, or use the hands to pull the third adjustment member78outward, and then rotate the third adjustment member78. The existence of the anti-slip patterns784can prevent the user from slipping when operating the control member7by using the hands.

In the field of internal combustion engine technology, it is well known that the power output provided by the carburetor often exceeds that of the electronic injection system. Since there are a large number of complex sensors in the electronic fuel injection system, the sensors will transmit the collected signals to the central controller ECU, and the ECU will control the fuel injection system to inject fuel to do work for the engine after calculation. The whole process will take a certain amount of time. The carburetor completely follows the laws of physics, and will provide accurate fuel to the engine at the moment of opening the throttle. Due to the fine fuel atomization effect, the engine can respond immediately and completely release the power. Compared with the traditional closed carburetor, all the adjustable mechanisms of the carburetor of the present disclosure are exposed, and can be adjusted without any tools, which is very convenient. In addition, the carburetor of the present disclosure is a mechanical fuel system, so it is more stable and reliable than the electric fuel injection system in harsh environments.

The above is only used to illustrate the technical solution of the present disclosure and not limit it. Other modifications or equivalent replacements made by those skilled in the art to the technical solution of the present disclosure, and as long as they do not depart from the spirit and scope of the technical solutions of the present disclosure, they all should be included in the claims of the present disclosure.