JPS58211556A - Device for preventing percolation of carbureter - Google Patents

Abstract

PURPOSE:To effectively prevent percolation by providing an opening and closing valve which opens and closes under the conditions of the negative pressure of a suction pipe and the temperature of cooling water at the intermediate part of a passage communicating the upper part of a float chamber with a negative pressure port opening in the Venturi part. CONSTITUTION:The carbureter exhausts the fuel within a float chamber 3 from a main nozzle 11 of a small Venturi 7. Further, an air passage 12 on the upstream side of large and small Venturis 7 and 8 is communicated with the upper part of the oil level of the float chamber 3 by means of an air vent pipe 13. A negative pressure port 15 is opened at a part of the above large Venturi 8, and is communicated and connected to the upper part of the oil level in the float chamber 3 by a passage 16 in which a negative pressure operating opening and closing valve 18 is disposed. The negative pressure chamber 18a of the opening and closing valve 18 is connected to the suction pipe 2 at the downstream of a throttle valve 9 through a negative pressure passage 19 interposed with a thermovalve 21 which opens when the temperature of cooling water exceeds a predetermined temperature.

Description

[Detailed Description of the Invention] The present invention provides that the vaporizer of heavy internal combustion engines (when wet)
]-Inside the tank, fuel vapor is generated in the tank, and the bar J Lazy 1's defense 11 is installed.

When using at high temperatures such as &tl1, a constant amount of fuel tq is always stored in the engine, etc., and in the carburetor.
・In the state where the temperature is heated up, the speed is <1, ＾ speed (if it is operated). There is no problem such as bar "region" etc. On the other hand, during idling and sluggish running, the fuel runs out.] -1- Because the time spent indoors is relatively long, the fuel gets heated up and becomes thinner.
WL, a large amount of fuel vapor is produced. And when driving with idle link, [11'4 M air seeps into the aiki passage (when the mixture becomes too rich), poor driving, low speed driving (]
Steam bubbles block the combustion passageway, causing intermittent flow of fuel from the main nozzle, etc., resulting in poor running conditions. .

As a conventional measure to prevent bar lag, heat shields and insulators reduce radiant heat and heat transfer from the engine body to the carburetor. Cool the vaporizer with AIFi air or cold water to remove smallpox in the vaporizer noro-I chamber.
Suppress 'rl υJ! The h payment called ``Jru'' is used.
, In recent years, the shape of car bodies has increased air resistance.
/,: There is a lot of waste, and the number of parts in one engine room is extremely large due to the heavy use of 11 widths.
There is not enough room in this engine room, and it is difficult to ensure ventilation, which reduces the effectiveness of the aforementioned heat shields and tends to cause perlorations.

In addition, there are actually some measures to deal with 1-Shirumen) 31 steam, for example, Utility Model Application Publication No. 139256, Utility Model Application Publication No. 5b
-44 (beyond the 103 yen publication) There is a technology in which when the engine is stopped, the whole heart is turned on by a 4-1, -star, etc. to burn lit steam.However, this The h method cannot deal with the generation of fuel vapor after engine operation. In view of this situation, the present invention has been developed to reduce the amount of fuel vapor generated during engine operation. Only sometimes the float chamber! (By flowing air,
In addition to quickly removing the fuel vapor that has already been generated, it also takes advantage of the endothermic effect of the fuel to vaporize.
The purpose of the present invention is to provide a vaporizer per-range prevention device that can directly suppress fuel vapor.

For this purpose, the device according to the invention is designed such that the chamber 11 is connected to the upstream air passage by a stone 1- Pa1'
ldo, nol-'I-1・Y) kHitobenf-1, the eyes are opened, and the air intake system that extends from the noro-1 room is connected to the Compose and inhale into the passage 1? ! 1
10IJ and cold lJ1 water - On-off valve that opens and closes with the stage r + 1 old), l idling and slow running in Part 6 (only when driving J) 1''-1 ~ ° Let the air flow all the way, there Tame・
) (b) is characterized by directing the fuel vapor that is present, promoting the vaporization of the fuel, and using the heat of vaporization generated at the time of (a) to lower the formation of the fuel itself and suppress the generation of fuel vapor.

Hereinafter, referring to the drawings, one embodiment of the present invention will be described in detail.
No. 3] is the 0-to chamber, and the float chamber 3 is the ノ [''-1
・It's a nail that works with 4! + is provided, fuel cylinder /6
The fuel pumped by the needle valve 5 is always stored at a constant level in the notebook chamber 3 by opening and closing the needle valve 5. In addition, the control 81 is a small valve L, 8 is a human valve fl, and 9 is a throttle valve. The air passage 12 on the first flow side of 1 and 8 is connected to the oil level F part of flow t-'+3 by 1 horn vent pi/'+3, and the pressure horn on the right side is connected to the oil level F part of flow t-'+3.
This prevents the air-fuel mixture from becoming too concentrated when the cleaner 14 is clogged.

In such a configuration, the 1-7 vent pipe 13G of the air passage 12 near the 14-hole 14 is at approximately human pressure; 51. When the engine is running, there is some intake air, but as the air flows, the bending pressure L1 can be reduced.

In addition, the large bench Isu 8's bench size is smaller than the small bench Isu 7's, but the 1 horn bend pino 13
The difference between Dlk and float 〒34 air flow is this C
・There is light. Considering these points of the gods, the mouth / rill! l+ is opened 1'' and C1 this corner 141115 is connected to the oil surface soil part of the float chamber 3 through the passage 16, and thus J, lino-I-work, i are connected to Eave A,
``l'J air circulation path 11 is configured to bypass the air passage 12.

h, G, L which is easy to form var-dione at high temperature.
When drinking and driving at low speed (yes, 8M M
B5, person Ben f18's Ben fLsu Ji-ga)1
1-1-￥3, the openings 11 of the nozzles 1-1 and 3 will increase and the suction of fuel from the main nozzle 11 will become worse. For this purpose, a negative H-type opening/closing valve 18 is installed in the middle of the first passage 16. 18a
Inside (1), <',/'')> 18M, the small suction pipe C'J D at LA speed is set so that it does not open [
There is. A cooling water passage 20 is installed in the middle of the negative H passage 19 (a υ-7 valve 21 is installed, which opens when the humidity of the cooling water reaches a predetermined high temperature).

With this configuration, when the engine is operating, the cooling u
1. In a cold state where the water temperature is low ('), the valve 21 is closed (the negative 14-path 19 of the suction pipe 12ri is closed), regardless of the operating state (the on-off valve 18 is closed).

Iko (・Air circulation path 11 is connected to C1J IJ
-l ``3'' is the same as before -[・Abentoba (11
3, it is in a state where it communicates only with η/air passage 12, and C1
]＋＋−14′3 Cooling of fuel due to air flow λ
Overload etc. are avoided.

Next, when the cold iJI water leakage reaches the level ^, the leak pulse 121 opens (the suction pipe negative pressure is introduced into the on-off valve 18).

When the suction pipe @lf is large, as shown in U), when the intake pipe is large, the on-off valve 18 is opened in step 61h of A, and the on-off valve 18 is brought into communication with the air circulation path 11. While such operation (゛ is J Aventha f) 13 has approximately human pressure C゜, negative pressure []15 of human vent fJ8
Since the suction airflow causes a negative 11 on the bench, the difference between these two components is 11.
3 through the light C passage 161 - air flows through the float chamber 3 .

Therefore, if there is fuel vapor generated while the float is stopped, this air flow in the float chamber 3 will cause it to be washed away, causing the internal atmosphere to become unsaturated and promoting vaporization on the fuel surface. Therefore, the heat of vaporization at this time causes the combustion to
The humidity on the 14th side is lIJ, and the humidity on the 11th side is GJ (
The entire 'l' 1lJl fuel causes a flow of 1st flow due to the difference in its composition, and the self-system 7JI progresses, and the new 1lJl vapor is actively suppressed by the koji.

1], this J, u', j: II + high-speed operation C without the risk of causing a humid bar "reage" is the suction pipe negative l
When t is small, the opening/closing valve 18 closes and prevents the C benzo 1 relo K from acting on the no u-1-constriction 3. Therefore, f[1-+
-V: The negative 11 of + increases and the problem of worsening of fuel suction from the main nozzle 11 can be avoided.

As is clear from the above description, according to the present invention, air is flowed into the notebook compartment 3 only in high-range/idling and low-speed driving where bulges are likely to occur. At this time, the already generated fuel vapor is quickly cultivated, and new fuel vapor is generated.The endothermic action of promoting vaporization of the fuel is suppressed and has the effect of reducing the fuel vapor. It is especially effective at preventing monkeys. Air circulation path 11 using f7 vent pipe "13" and negative Jf of venturi 8 (%-3CJj to the structure with J added)]1-
The vaporizer in chamber 3) 1 is inhaled and used for combustion.
, a waste of fuel, and a lack of fuel consumption. Burlage 1
If there is no risk of the air flow being interrupted, passage 1 () of the air circulation path 11 is blocked and the same condition as before is established (-).
, N: iK It is preferable to prevent the fuel from getting too cold or from sucking out the fuel at fast speed. In the history, the passage 16 is opened and closed depending on the suction pipe and the cold u1 water temperature t'r18
Opening/closing system -・jruno(・.

There is definitely a movement n.

[Brief explanation of drawings]

The same song is a small example of Rumi according to the present invention! It is a J sectional view. 1... Vaporizer, 2... Inhalation pipe, 3... ]] Eye-t
-U4...Flow] -15...&1 valve, 6...Fuel cylinder °, 1...Small Ben J'su, 8...Person Ben f
jsu, 9...s11 tutle i? , 10... Fuel passage, 11... Main nozzle, 12 River air passage, 13...
・、■Abend Vibe, 14...■Nol Kurino. 15...Negative pressure port, 16...Passway, 11...Air distribution system path, 18...Opening/closing valve, 18a...Corner 11 chamber, 1
'8b...Spring, 19...611 passage, 20
...Cooling water passage, 21...Lehivar 1. .

Claims (1)

[Claims] A 17 vent vane is installed between the flow side of the bench and the oil level in the foot chamber. A part of the human vent f1 ('opening negative H port communicates with a passage') forms an air circulation system path from the air passage marked C and # to the air passage 4u through the L abend vibe and the noroto 1 passage 4u, In the middle of the 12 passage, a #1 opening/opening valve is set up by the suction pipe negative H (6), and a V-movalzo which is opened by the cooling water at 14°C is installed in the negative pressure passage to the opening/closing valve. A vaporizer burl-shine prevention device characterized by: