CN2245671Y - Nozzle plunger-type carburetor - Google Patents

Abstract

The utility model discloses a spraying tube plunger-type carburetor, belonging to the technical field of gasoline engines. A conic oil needle plunger-type carburetor of a traditional gasoline engine has the disadvantages of poor atomizing quality, rough oil and gas proportion, insufficient combustion, high fuel oil consumption rate, serious pollution and unstable running of the gasoline engine. The purpose of the technique is to solve the problems. The utility model is characterized in that the original conic oil needle is replaced by the spray pipe with variable parameters; an air inlet valve is additionally arranged between an air inlet pipe and a mixing chamber to ensure that air input quantity is reasonably added when the utility model moves and rotates, an idling spraying pipe is installed on an idling spraying nozzle so that the utility model has the advantages of sufficient combustion of gasoline, small oil consumption and reduced pollutant discharging.

Description

The injection spray pipe plunger type carburetor

Title of the present utility model is the injection spray pipe plunger type carburetor, belongs to the gasoline technology field.

The tradition plunger type carburetor, utilize the method that becomes the aditus laryngis cross section and infiltrate air modulation fuel delivery, substantially can satisfy the requirement of petrol engine variable working condition fuel supply rate curve, have advantages such as simple in structure, that cost is low, be the widely used supplier of motorcycle, minicar.But the garden that it adopts awl spindle formula main oil supply system fuel-oil atmozation is of poor quality, the gas oil ratio precision is coarse, especially when the big load operation of low speed, garden awl spindle is along with carrying on the plunger, the gap of spindle and nozzle endoporus is strengthened, the fuel oil of ejection increases, and the induction air flow ratio of this moment is lower, and fuel-oil atmozation is poorer, it is more to drop on the oil mass that forms oil film on the tube wall, will form like this: (1) oil film favorable current flows in the cylinder along tube wall, and atomization badness mixes uneven, air fuel ratio is improper, make the burning variation, thereby the fuel consumption increase, and carbon monoxide in the exhaust, oxious component content such as hydrocarbon increase; (2) each work cycle enters the oil film mass flow discrepancy in the cylinder, makes the petrol engine combustion running unstable; (3) the lubricious oil film of fastness faces such as fuel film dilution casing wall and crankshaft bearing is accelerated wearing and tearing.

The utility model is on the basis of traditional plunger type carburetor, replace original taper spindle with the injection spray pipe that can change fuel injection parameter, and set up a deceleration and add suction valve and idle tube, constitute the plunger type carburetor of novel spraying tubular type, make fuel feeding more accurate, petrol engine is under any circumstance turned round can both obtain mix, mixed gas that air fuel ratio is suitable, it is more perfect that fuel combustion is got, thereby obtain fuel saving and reduce the effect of blowdown.

Structure of the present utility model and workflow are as follows: the PZ26 type Carburetor of using with motorcycle is that example is introduced.Accompanying drawing is the novel Carburetor that the PZ26 Carburetor is transformed into for the basis, and it is changed below doing on the former Carburetor: 1. the injection spray pipe (3) with variable fuel injection parameter replaces original taper spindle; 2. injection spray pipe (3) is thin-walled half a logical garden pipe, is installed in the below of plunger (15), pass through suction tude (2) aditus laryngis (14), air pipe (4), insert in the oil well of the foam tube (7) that has fuel oil main jet (8), can move up and down with base for post (15).Injection spray pipe (3) has the spray holes that is communicated with center hole on the side, and its size, quantity and the fuel supply rate curve of arranging by various Carburetor situation of change require to decide.Injection spray pipe (3) is the slip tolerance fit with the pilot hole of guide pipe (4); 3. between the mixing chamber (13) of preceding suction tude (2) of plunger (15) and post post-games face, install the additional suction valve (18) that slows down additional, it by valve body (20), spring (17), adjust plug screw (19) and constitute.(16), (21) are respectively additional air inlet, air outlet channel; 4. install an idle tube (12) that 3-4mm is high on idle jet additional, its spray orifice is straight through equating with former spout.

Behind the gasoline engine starting during idle running, lean on plug and be in idling and open displacement and put, aditus laryngis (14) flow area is very little, and air inflow seldom, the fuel oil of the post competition style Carburetor of original structure sprays into suction tude (2) from idle jet, because former spout opens on tube wall, and the flow velocity of air inlet is very low during idling, thereby fuel-oil atmozation is very poor, major part drops on and forms oil film on the tube wall, cause petrol engine idle running shakiness like this, and idling speed is difficult to reduce, exhaust emission is serious.Make fuel oil in the middle of wall sprays to air-flow after installing jet pipe (12) additional, be easy to atomizing, reduce the wall oil mass that falls the idling mixed gas quality is improved, thereby improve idle running stability, can suitably reduce idling speed, and reduce idle exhaust emission and pollute.When the speed of a motor vehicle improves, the load of petrol engine strengthens, on carry the plunger of Carburetor, the aditus laryngis flow area is increased, air inflow increases, injection spray pipe (3) is carried on plunger (15), the fuel delivery of this moment is except that being subjected to main jet (8) metering, also be subjected to the hole count size of spray holes of the enterprising airflow space of injection spray pipe (3) and the modulation of flow coefficient, thereby the fuel delivery of each operating mode is more accurate, and institute's fuel feeding is sprayed in the inlet stream by some spray orifices, make full use of fluid dynamic energy, atomize in the space, evaporation, mix, the ratio that the wall that falls is formed with oil film significantly reduces, make petrol engine under any working condition, can both obtain the uniform fuel-air mixture of the suitable quality of concentration, improve burning, reduce fuel consumption and exhaust emission.

Test shows, with in, the automobile of running at high speed, motorcycle transfers to and slowing down when sliding, hydrocarbon discharge capacity harmful in the exhaust accounts for more than 50% of full operating mode hydrocarbon total displacement, plunger (or closure when reason is deceleration, 15) close to idling aperture position suddenly, air inflow is few, and the suction force of still making the gasoline engine cylinder run up is still very big, make the degree of vacuum of mixing chamber (13) of plunger back very high, the steam output of tube wall oil film is increased, and also increase from the oil mass of idling oil circuit sucking-off, thereby make mixed gas become dense, burn deterioration, the hydrocarbon of discharging increases, the deceleration of installing additional adds suction valve (18) and is connected on the suction tude of plunger (15) front and back, is to be compressed by spring (17) usually, the additional air inlet of blocking-up.Petrol engine is when constant speed, accelerated service, and the vacuum degree deficiency in the mixing chamber (13) is to overcome the impacting force of spring (17), and one-way valve (18) is not opened, and additional intake duct (16) is obstructed, and not additional air inlet.When petrol engine slows down, plunger (15) drops to idling aperture position, the mixing chamber vacuum increases, and is enough to overcome the impacting force of spring (17), and valve (18) is got through additional intake duct, begin additional air inlet, like this, owing to air inflow increases, and fuel feeding and fuel film vaporization amount reduce owing to mixing chamber degree of vacuum reduces, so can form rarer mixed gas, burning improvement, hydrocarbon discharge capacity are reduced.After petrol engine rotational speed descended, mixing chamber degree of vacuum was reduced to when being not enough to overcome the impacting force of spring (17), and one-way valve (18) is promptly closed additional intake duct, just recovers normal operation.

Through above-mentioned improved novel Carburetor, make petrol engine no matter can both obtain the uniform mixed gas of concentration appropriate mass during at idling, acceleration, constant speed and decelerate, burning is improved.

Description of drawings:

Fig. 1: the petrol engine injection spray pipe plunger type carburetor that can change fuel injection parameter

Fig. 2: additional suction valve slows down

Fig. 3: Carburetor sectional view

Wherein: 1-chock plate, 2-suction tude, 3-oil injection spray pipe, 4-guide pipe, 5-oil-feed needle-valve, 6-float, 7-foam tube, 8-oil main jet, the 9-float chamber, 10-idling jet and foam tube, 11-idle adjusting screw, 12-idling oil jet pipe, 13-mixing chamber, 14-suction tude aditus laryngis, the 15-plunger, 16-adds intake duct, the 17-spring, 18-adds suction valve, and 19-adjusts plug screw, 20-valve body.

The utility model carburetor has kept plunger type carburetor simple in structure, cheap Advantage, greatly improved again supply characteristics, can guarantee that gasoline engine under any circumstance transports Institute's fuel delivery is more accurate when turning to, and it is more abundant to atomize, and makes gasoline engine obtain air-fuel ratio relatively Suitable, the measured gaseous mixture of mictoplasm improves burning, thereby the economy that acquisition is got well, Dynamic property and low exhaust emission are at motorcycle, minicar two-stroke, four-stroke-cycle vapour Adopt on the plunger type of the various models that oil machine is used (the comprising the equal vacuum plunger type) carburetor, Do not increasing process equipment, substantially do not increasing under the prerequisite of cost, can obtain performance, The Expected Results of low emission has great economic benefit and social benefit.

Claims (4)

1. an injection spray pipe plunger type carburetor that is made of plunger, suction tude, mixing chamber, float chamber is characterized in that it is to be made of additional suction valve (18) between injection spray pipe (3), suction tude (2) and the mixing chamber (13) of the changed fuel injection parameter that is installed in plunger (15) below and the idling spray bar (12) on the idling jet.

2. according to the said injection spray pipe plunger type carburetor of claim 1, it is characterized in that said injection spray pipe (3) is mounted in the below of plunger (15), passes through aditus laryngis (14), guide pipe (4), insert in the oil well of foam chamber (7) that there are some spray holes that are communicated with the tube hub hole its side.

3. according to the said injection spray pipe plunger type carburetor of claim 1, it is characterized in that said additional suction valve (18) is mounted between suction tude (2) and the mixing chamber (13), there are additional suction tude (16) and additional air outlet channel (21) in the valve both sides, communicate with suction tude (2), mixing chamber (13) respectively, valve is made of valve body (20), spring (17), adjustment plug screw (19).

4. according to the said injection spray pipe plunger type carburetor of claim 1, it is characterized in that the long 3-4mm of said idle tube (12), be installed on the idle jet that spray orifice is straight through equating with former spout.

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