CN1299007A - Low velocity fuel system device for carburetor - Google Patents

Abstract

The fuel oil system of corburetter for low speed fuel is formed by setting the major axis XX-of low speed path in a straight line, along which are the low speed fuel oil nozzle in the upper stream and low speed exhausting pipe in the down stream. The upper stream opening of the low speed path is set below the y-y line of the fixed liquid level in the floating box and adjacent to the main fuel oil nozzle, and the dowm stream opening of low speed path is set inside the by-pass chamber. The system can supply low speed fuel oil stably to the suction path and reduce the cost of manufacturing the low speed fuel oil system of the carburettor.

Description

The low velocity fuel system device of Carburetor

The present invention relates to adjust, control the mixture strength of supply engine and the Carburetor of air-fuel mixture amount, be particularly related to and wherein corresponding air throttle end run through the indoor low speed fuel of bypass that is arranged at carburetor main body, supply to the low velocity fuel system device of the Carburetor in the air-breathing road by by-pass hole etc.

The low velocity fuel system device of existing Carburetor has the first low speed path and the second low speed path.This first low speed path has low speed fuel nozzle and low speed exhaust tube, and described low speed fuel nozzle is to measure, control as low speed fuel holding the fuel of staying in the buoyancy tank; Described low speed exhaust tube is the velocity air and the fuel mix of being controlled by the low speed fuel nozzle that makes by the control of velocity air nozzle, forms mixed on low speed gas.It is indoor that this second low speed path is that the mixed on low speed gas that is used for being formed at the described first low speed path is supplied in the bypass at the place, level of fuel top in the buoyancy tank.

The above-mentioned first low speed path is provided with in vertical direction, and this is because position thereunder will be connected with the level of fuel below in the buoyancy tank, and position above it, be to low speed exhaust tube supply velocity air.

And the second low speed path is the mixed on low speed gas that is mixed by the low speed exhaust tube for to the indoor supply of bypass, and the bypass of locating more on the top than the top of the first low speed passage downstream end is indoor towards being positioned at, and roughly forms in horizontal direction.

That is to say, in low velocity fuel system device, the fuel in the buoyancy tank is attracted upward that the low speed fuel of being controlled by the low speed fuel nozzle then arrives the low speed exhaust tube.On the other hand, it is that the velocity air by the control of velocity air nozzle is supplied to the low speed exhaust tube, and above-mentioned low speed fuel is emitted velocity air and formed mixed on low speed gas with this low speed exhaust tube.

It is indoor that this mixed on low speed gas is sucked into bypass by the second low speed path towards substantially horizontal, then is sucked out to air-breathing road from by-pass hole, guiding tap hole again.

If adopt the low velocity fuel system device of this Carburetor, because its low speed path is to be made of first low speed path of Vertical direction and the second low speed path of substantially horizontal, so have following problem.

The first, when the mixed on low speed air-flow that forms by the first low speed path during through the second low speed path, in the second low speed path, air and fuel are separated into stratiform, so, from the low speed fuel instability of by-pass hole sucking-off to the air-breathing road, mixed on low speed gas concentration is also unstable.

And, according to above-mentioned, also can hinder the smooth low-speed running of motor, and for minimizing exhale pernicious gases composition, to reduce fuel cost etc. all unfavorable.

The second, when running through from substantially horizontal when the second low speed path is set, at atmosphere one side opening, thereby need stop up this opening portion with obstruction components such as bulb stoppers with the starting point of drilling device processing.

Like this, the first low speed path and the second low speed path need be processed respectively, and need to stop up the opening of the second low speed path in atmosphere one side.

Therefore need more part and processing, obstruction operation, thereby can not reduce the manufacture cost of Carburetor.

The present invention is in view of the above problems and exploitation, its objective is provide a kind of make stable and can reduce the low velocity fuel system device of the Carburetor of Carburetor manufacture cost from the low speed fuel of by-pass hole sucking-off to the air-breathing road.

For achieving the above object, the low velocity fuel system device main composition of Carburetor of the present invention is that in Carburetor, the major axis shaft axis X-X that will have the low speed path of low speed fuel nozzle and low speed exhaust tube is provided with point-blank downstream from the upstream; Be positioned at fixedly below the liquid level and of buoyancy tank near the main fuel spray nozzle place that constitutes normal fuel system, with the upstream-end opening of described low speed path; The direct connection opening of the downstream of low speed path is indoor in bypass.Described Carburetor is to utilize the air throttle control be installed on the solar term valve shaft that the rotatable earth's axis is supported on carburetor main body to open and close the air-breathing road that connects carburetor main body, and, will run through the indoor low speed fuel of bypass that is arranged at carburetor main body corresponding to the air throttle end and be supplied in the air-breathing road by by-pass hole etc.

The fixedly liquid level below of low speed path in the buoyancy tank forms point-blank towards the bypass chamber, is provided with the low speed fuel nozzle at its upstream, is provided with the low speed exhaust tube in its downstream.

And the fuel in the buoyancy tank towards the low speed exhaust tube, is gone into velocity air by the low speed atmospheric pipe by the control of low speed fuel nozzle, thereby forms mixed on low speed gas; It is indoor that this mixed on low speed gas directly is supplied to bypass by the path that is straight line, and by the by-pass hole sucking-off to the air-breathing road.

Below by description of drawings one embodiment of the present of invention.

Fig. 1 is an embodiment's of the low velocity fuel system device of expression Carburetor of the present invention major component longitudinal section.

Fig. 2 is the normal fuel system M of expression Carburetor shown in Figure 1 and the major component worm's eye view of low velocity fuel system S.

1 is that air-breathing road 2 connects inner carburetor main body in a side, and is provided with solar term valve shaft 3, these solar term valve shaft 3 cross-section air-breathing roads 2, and the rotatable earth's axis is bearing on the carburetor main body 1.

Be equipped with butterfly air throttle 4 on solar term valve shaft 3, air-breathing road 2 opens and closes by these air throttle 4 controls.

M is the normal fuel system device of Carburetor, is made of for example main fuel spray nozzle 5, main nozzle 6 etc.Described main fuel spray nozzle 5, main nozzle 6 are arranged on the central authorities on air-breathing road 2, simultaneously, the fixedly liquid level Y-Y line lower opening of described main fuel spray nozzle in buoyancy tank 8, described buoyancy tank 8 is to be formed by the buoyancy tank main body 7 that is located at carburetor main body 1 below.

The central authorities that main fuel spray nozzle 5 is arranged on air-breathing road 2 be because, when Carburetor tilted, the fuel in the buoyancy tank 8 can not overflow in the air-breathing road 2 by main fuel spray nozzle 5, perhaps main fuel spray nozzle 5 can not expose the space portion above the fixing liquid level Y-Y line.

The following describes low velocity fuel system S.

9 is the bypass chamber, under the low aperture state of air throttle 4, is arranged with in carburetor main body 1 corresponding to the end 4A of air throttle 4.Described bypass chamber 9 is provided with opening towards the below, but described opening stops up with stopper 10, runs through the by-pass hole 11 that is provided with in the air-breathing road 2 in the upper bottom portion of bypass chamber 9 in addition.

The major axis shaft axis X-X of low speed path 12 is located on the straight line, a side is provided with low speed fuel nozzle 13 at its upstream, be provided with low speed exhaust tube 14 in its downstream one side with a plurality of vent holes, supply is by the velocity air path 16 of the velocity air of velocity air nozzle control not shown in the figures, at ring-type well portion 15 place's openings of low speed exhaust tube 14 peripheries.

As mentioned above, the major axis shaft axis X-X of above-mentioned low speed path 12 is straight line, and its upstream extremity 12A is being positioned at below the fixedly liquid level Y-Y line of buoyancy tank 8 and main fuel spray nozzle 5 place's openings of close normal fuel system M; Its downstream 12B is directly towards bypass chamber 9 inner openings.

Motor one running, the negative pressure that produces in the air-breathing road 2 imports in the bypass chamber 9 by by-pass hole 11; Fuel in its nozzle control buoyancy tank 8 of low speed fuel nozzle 13 usefulness, and controlled low speed fuel imports in the low speed exhaust tube 14.

On the other hand, the velocity air of being controlled by velocity air nozzle not shown in the figures is supplied in the low speed exhaust tube 14 by ring-type well portion 15, vent hole, and this velocity air is mixed with above-mentioned low speed fuel in low speed exhaust tube 14, forms mixed on low speed gas.

And above-mentioned mixed on low speed gas imports in bypass chamber 9 from the downstream 12B of low speed path 12, then, is sucked out to air-breathing road 2 by by-pass hole 11.

As mentioned above, the low velocity fuel system device of Carburetor of the present invention, the major axis shaft axis X-X that will have the low speed path of low speed fuel nozzle and low speed exhaust tube is provided with point-blank downstream from the upstream; Be positioned at fixedly below the liquid level and of buoyancy tank near the main fuel spray nozzle place that constitutes normal fuel system, with the upstream-end opening of above-mentioned low speed path; And the downstream of low speed path is directly connected to the indoor and opening of bypass, therefore, the mixed on low speed air-flow that is in good admixture after utilizing the low speed exhaust tube fully to exit can not form stratiform in the low speed path time, and in that to keep supplying with bypass under the good mixing state indoor.

And, can in air-breathing road, supply with stable mixed gas from the bypass chamber by by-pass hole, like this, can make concentration stabilize by the mixed on low speed gas of air-breathing road supply engine, thereby can improve the low-speed running performance of motor, and can reduce the harmful gas composition that motor is discharged.Again because the concentration stabilize of mixed on low speed gas, and the denseization tendency of mixed gas is inhibited, thereby can improves fuel economy.

In addition, because the formation of the major axis shaft axis of low speed path point-blank, when air throttle is opened rapidly, it is indoor that mixed gas successfully flows into bypass from the low speed path, along with the negative pressure in the air-breathing road increases, there is not to supply with mixed gas, so can improve the accelerated service performance sluggishly.

Again since the upstream-end opening of low speed path at fixedly below the liquid level and of buoyancy tank near the main fuel spray nozzle place, so even Carburetor tilts, can not be subjected to the influence of the fixer face tilt in the buoyancy tank yet, thereby can provide slope characteristic good low velocity fuel system device.

There is processing of processing and utilization of low speed path to finish again, therefore can realizes reducing significantly the quantity of processing accessories.

The upstream-end opening of above-mentioned low speed path in buoyancy tank fixedly below the liquid level, and its downstream-end opening is indoor in bypass, therefore need not to use stopper etc. to stop up this low speed passage opening, thereby can reduce number of spare parts and save and stop up the stopper operation.

Claims (1)

1. the low velocity fuel system device of Carburetor is characterized in that, in Carburetor, the major axis shaft axis X-X that will have the low speed path (12) of low speed fuel nozzle (13) and low speed exhaust tube (14) is provided with point-blank downstream from the upstream; Fixedly locating below the liquid level and near the main fuel spray nozzle (5) that constitutes normal fuel system (M) of buoyancy tank (8), with upstream extremity (12A) opening of described low speed path (12); And the downstream (12B) of low speed path (12) is directly connected to the indoor opening of bypass; Described Carburetor is to utilize the air throttle control be installed on the solar term valve shaft that the rotatable earth's axis is supported on carburetor main body to open and close the air-breathing road that connects carburetor main body, and, will run through the indoor low speed fuel of bypass that is arranged at carburetor main body corresponding to the air throttle end and be supplied in the air-breathing road by by-pass hole etc.

Images