In one aspect of the present invention carburetor comprises a hollow first cylinder and a hollow second cylinder. In one embodiment, hollow first cylinder comprising plurality of nozzles formed on the lateral surface and nozzles providing flow path for a fuel to flow from the hollow region to outside of the later surface of the first cylinder. In another embodiment, hollow second cylinder placed on the first cylinder and the axis of the first cylinder and the second cylinder coincide. In another aspect of the present invention, sliding the second cylinder over the first cylinder, and number of nozzles through which fuel flows out increases when the outer cylinder is slide in first direction. In one embodiment, the first cylinder is placed in a first region through which air is sucked into the combustion chamber. In another embodiment, a throttle control operative to increase the engine power, may be coupled to the second cylinder such that increasing throttle pulls the second cylinder in the first direction.

In one aspect of the present invention carburetor comprises a hollow first cylinder and a hollow second cylinder. In one embodiment, hollow first cylinder comprising plurality of nozzles formed on the lateral surface and nozzles providing flow path for a fuel to flow from the hollow region to outside of the later surface of the first cylinder. In another embodiment, hollow second cylinder placed on the first cylinder and the axis of the first cylinder and the second cylinder coincide. In another aspect of the present invention, sliding the second cylinder over the first cylinder, and number of nozzles through which fuel flows out increases when the outer cylinder is slide in first direction. In one embodiment, the first cylinder is placed in a first region through which air is sucked into the combustion chamber. In another embodiment, a throttle control operative to increase the engine power, may be coupled to the second cylinder such that increasing throttle pulls the second cylinder in the first direction.

A charge forming device includes a housing having an inlet chamber in which a supply of fuel is received, a vent passage communicating with the inlet chamber and a throttle bore with an inlet through which air is received, a throttle valve carried by the housing with a valve head movable relative to the throttle bore to control fluid flow through the throttle bore, a vent valve. The vent valve is carried by the housing and has a valve element that is movable between an open position wherein fluid may flow from the inlet chamber through the vent passage and a closed position where fluid is prevented or inhibited from flowing out of the inlet chamber through the vent passage, the vent valve being electrically actuated, and wherein the vent valve is actuated as a function of a pressure within the inlet chamber or the vent passage.

A charge forming device includes a housing having an inlet chamber in which a supply of fuel is received, a vent passage communicating with the inlet chamber and a throttle bore with an inlet through which air is received, a throttle valve carried by the housing with a valve head movable relative to the throttle bore to control fluid flow through the throttle bore, a vent valve. The vent valve is carried by the housing and has a valve element that is movable between an open position wherein fluid may flow from the inlet chamber through the vent passage and a closed position where fluid is prevented or inhibited from flowing out of the inlet chamber through the vent passage, the vent valve being electrically actuated, and wherein the vent valve is actuated as a function of a pressure within the inlet chamber or the vent passage.

The present utility model relates to a carburetor with adjusting tool for garden machinery engine with anti-flow tampering function. The carburetor is comprised of a carburetor body, an idle oil needle, an oil needle spring, a plunger nut, a flow adjusting nail, a flow nail spring, a gasket and a sealing ring, wherein the idle oil needle and the flow adjusting nail are both provided with a special tool adjusting part, the special tool adjusting part is comprised of a section of cylinder, and the surface of the cylinder is provided with a micro wedge-shaped adjusting structure in the axial direction. In the present utility model, the flow and opening of the carburetor can only be adjusted using a special tool by changing the structure of the idle oil needle and the flow adjusting nail, which can effectively avoid the problem that the state of the carburetor is adjusted by users by using a common screwdriver, which causes the engine to fail to work normally or even be damaged due to improper adjustment, thus resulting in unnecessary after-sales service work, guaranteeing that the state as delivered is not easy to be freely adjusted by users, thus effectively ensuring the low emission value.

The present utility model relates to a carburetor with adjusting tool for garden machinery engine with anti-flow tampering function. The carburetor is comprised of a carburetor body, an idle oil needle, an oil needle spring, a plunger nut, a flow adjusting nail, a flow nail spring, a gasket and a sealing ring, wherein the idle oil needle and the flow adjusting nail are both provided with a special tool adjusting part, the special tool adjusting part is comprised of a section of cylinder, and the surface of the cylinder is provided with a micro wedge-shaped adjusting structure in the axial direction. In the present utility model, the flow and opening of the carburetor can only be adjusted using a special tool by changing the structure of the idle oil needle and the flow adjusting nail, which can effectively avoid the problem that the state of the carburetor is adjusted by users by using a common screwdriver, which causes the engine to fail to work normally or even be damaged due to improper adjustment, thus resulting in unnecessary after-sales service work, guaranteeing that the state as delivered is not easy to be freely adjusted by users, thus effectively ensuring the low emission value.

A charge forming device includes a housing having an inlet chamber in which a supply of fuel is received, a vent passage communicating with the inlet chamber and a throttle bore with an inlet through which air is received, a throttle valve carried by the housing with a valve head movable relative to the throttle bore to control fluid flow through the throttle bore, a vent valve. The vent valve is carried by the housing and has a valve element that is movable between an open position wherein fluid may flow from the inlet chamber through the vent passage and a closed position where fluid is prevented or inhibited from flowing out of the inlet chamber through the vent passage, the vent valve being electrically actuated, and wherein the vent valve is actuated as a function of a pressure within the inlet chamber or the vent passage.

A charge forming device includes a housing having an inlet chamber in which a supply of fuel is received, a vent passage communicating with the inlet chamber and a throttle bore with an inlet through which air is received, a throttle valve carried by the housing with a valve head movable relative to the throttle bore to control fluid flow through the throttle bore, a vent valve. The vent valve is carried by the housing and has a valve element that is movable between an open position wherein fluid may flow from the inlet chamber through the vent passage and a closed position where fluid is prevented or inhibited from flowing out of the inlet chamber through the vent passage, the vent valve being electrically actuated, and wherein the vent valve is actuated as a function of a pressure within the inlet chamber or the vent passage.

A needle valve body (220) has a needle hollow part (230) and a slit (232) extending in an axial direction and opened forward in a tip region. The carburetor body (B) has a body hole (202) receiving the needle valve body (220) in a longitudinally displaceable manner along an axis and a step-part circumferential edge (240a) formed in the body hole (202) and forming an orifice (250) with the slit (232) of the needle valve body (220). By operating the needle valve body (220) to adjust the size of the orifice (250), an amount of fuel supplied to a fuel discharge part (Fout) can be adjusted.

A needle valve body (220) has a needle hollow part (230) and a slit (232) extending in an axial direction and opened forward in a tip region. The carburetor body (B) has a body hole (202) receiving the needle valve body (220) in a longitudinally displaceable manner along an axis and a step-part circumferential edge (240a) formed in the body hole (202) and forming an orifice (250) with the slit (232) of the needle valve body (220). By operating the needle valve body (220) to adjust the size of the orifice (250), an amount of fuel supplied to a fuel discharge part (Fout) can be adjusted.