RU34972U1 - MEMBRANE CARBURETOR - Google Patents

Description

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MEMBRANE CARBURETOR

The utility model relates to engine building, and in particular to carburetors for internal combustion engines.

Known membrane carburetor but a, p. No. 823616 (publ. 23.0481), comprising a main air duct housing with air and throttle valves, idle system and main metering system channels, a pump membrane, an inlet pipe with a pump damper, a tinting chamber, a regulator membrane with a plate and a fuel valve, the fuel chamber of the pump damper is connected to the inlet pipe in parallel with at least one channel, the idle system is equipped with a damper, and the fuel valve is in the open position

directly connected to the fuel regulator plate.

The disadvantage of this solution is the low productivity of the fuel pump with small dimensions of the carburetor, unstable feed

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fuel when starting a cold engine at low temperatures.

Known floatless carburetor on.with. 1166556 (publ. 02.27.1996), comprising a housing with a main air channel, air and throttle valves located therein, channels of the idle system and the main metering system, and a fuel chamber housing with

a membrane regulator, moreover, at least one fuel cavity is filled in the housing of the fuel chamber communicated by channels with the idle system, the main metering system and the fuel chamber of the membrane regulator, and the reverse channel is installed in the channel communicating the main metering system with the fuel zero valve.

The disadvantage of this solution is the low productivity

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fuel pump with small carburetor dimensions, unstable feed

,, -. Fuel when starting a cold engine at low temperatures.

The proposed utility model:, solves the problem of innovation

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performance of the fuel pump at low pressure in the gas chamber when starting a cold engine.

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Throttle valves, fuel channels, a tambour near the pump, an intake pipe with a fuel filter and a pump damper, a fuel regulator chamber, a fuel valve, and a fuel regulator membrane, an idle emulsion chamber are located in the gas chamber of the fuel pump and are separated from it by a plug.

Distinctive features of the proposed membrane carburetor from the above known, closest to it, is that the emulsion idling chamber is located in the gas chamber of the fuel pump and is separated from it by a plug.

Due to the presence of these signs, the membrane area of the fuel pump increases, its performance increases at low pressure in the gas chamber during the start of a cold engine, it is ensured

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stable fuel supply when starting a cold engine at low temperatures.

The proposed design is illustrated in the drawing.

The drawing shows a schematic diagram of a carburetor.

The carburetor comprises a housing 1 with a main air channel A, a fuel regulator housing 2 and a cover; 3. In the main air duct case, a throttle valve 4, a non-return valve 5, an air damper 6, a plug 7, which separates the emulsion idling chamber B and the chamber, are installed

FUEL PUMP gas pump L, idle mixture quality screw 8, and working mixture mixture quality screw 9. In the fuel regulator body there is a fuel valve 10, pressed against the saddle with a screw 11, rotating on the axis 12 under the influence of a spring 13, fuel filter 14. Between the housing 2 and

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3, the fuel regulator membrane 15 is installed, with an emphasis 16. Between the fuel filter and the fuel pump chamber, the inlet fuel pump valve is located 17. The fuel pump chamber D is separated from the fuel pump chamber by a gas L pump membrane.

18. Between the fuel pump chamber D and the fuel damper chamber F

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in the direction of movement of the fuel there is a valve of the fuel pump upstream 19.

Between the body of the main air channel 1 and the body of the fuel regulator 2 there is a gasket 20, and between the body of the fuel regulator 2 and the cover 3 - gasket 21.

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-... .., l and moves the diaphragm of the pump 18, nrn this tonnvo through the channel And is sucked through the fuel filter 14, the valve of the fuel pump inlet 17 into the chamber of the fuel pump D. The emulsion chamber B is located in the chamber of the fuel pump gas L and is divided plug 7, which allows to increase the working area of the membrane of pump 18, to increase the productivity and stability of the fuel pump. From the fuel pump chamber D, fuel is pumped through the inlet 19 fuel pump valve and the fuel damper chamber Ж to the fuel valve 10. Under the influence of the fuel regulator membrane 15, which moves under the influence of rarefaction of air created in the main air channel, focusing 16 acting on one end of the two-shouldered

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the lever of the fuel valve 11, rotating on the axis 12, compresses the spring 13,

the second end releasing the valve 10, which opens the access of fuel to

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fuel regulator chamber E. Fuel valve 10, lever 11 on the axis 12,

spring 13 is made as a single unit, with the body of the fuel regulator 2. When the engine is idling, fuel from the chamber of the fuel regulator E through the fuel channel K through the idle mixture quality screw 8, the emulsion chamber B and channels B are fed into the diffuser space of the main air channel A, wherein the check valve 5

closed. As you open the throttle 4 increases the air flow,

 .,. passing through the main air channel A, due to which the pressure in

the diffuser decreases, which leads to the opening of the non-return valve 5 and the fuel from the chamber of the fuel regulator E through the channel K through the screw of the quality of the working stroke 9 enters the main air channel A.

The location of the emulsion chamber idle in the gas cavity

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fuel pump made it possible to increase the area of the pump membrane

more than 50% without changing the overall dimensions of the carburetor, which allowed to increase the diaphragm stroke at low pressures in the gas cavity and, as a result, the performance of the fuel pump during engine start-up, to improve the starting characteristics of the engine at low temperatures by reducing the time it takes to fill the carburetor fuel system, provide fuel for engines of higher power.

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Claims (1)

A membrane carburetor comprising a main air duct housing with air and throttle valves, fuel channels, a pump membrane, an inlet pipe with a fuel filter and a pump damper, a fuel regulator chamber, a fuel valve and a fuel regulator membrane, characterized in that the idle emulsion chamber is located in the gas chamber of the fuel pump and is separated from it by a plug.