JPH0231222B2 - - Google Patents
Info
- Publication number
- JPH0231222B2 JPH0231222B2 JP57085666A JP8566682A JPH0231222B2 JP H0231222 B2 JPH0231222 B2 JP H0231222B2 JP 57085666 A JP57085666 A JP 57085666A JP 8566682 A JP8566682 A JP 8566682A JP H0231222 B2 JPH0231222 B2 JP H0231222B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- tank
- fuel tank
- float chamber
- carburetor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002828 fuel tank Substances 0.000 claims description 33
- 239000000446 fuel Substances 0.000 claims description 21
- 238000000605 extraction Methods 0.000 claims description 6
- 210000003437 trachea Anatomy 0.000 claims 1
- 239000003502 gasoline Substances 0.000 description 20
- 238000009423 ventilation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000010763 heavy fuel oil Substances 0.000 description 2
- 241001124569 Lycaenidae Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
- F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は気化器フロート室内の燃料を自動的に
抜き取る装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for automatically removing fuel from a carburetor float chamber.
（従来の技術）
従来の汎用小型エンジンでフロート式気化器を
備えたものは、一般にエンジンを停止ボタンで電
気的に停止した後長時間放置すると、気化器のフ
ロート室内に滞留したガソリンが空気中の酸素と
反応し変質劣化してガソリンのガム分などを析出
し気化器のガソリン通路孔をふさぎ次回使用時に
始動不良となる欠点があつた。即ち田植機、刈取
機等季節性のある農機等に使用されるエンジンは
停止して保管される期間が数ケ月以上におよび、
そのエンジン停止期間中には気化器フロート室内
の残留ガソリンを抜き取るよう解説した取扱説明
書がユーザに渡されているが、面倒な為実行され
ず、エンジン始動不良の苦情が絶えなかつた。(Prior Technology) Generally speaking, in conventional small general-purpose engines equipped with a float type carburetor, if the engine is left for a long time after being electrically stopped using the stop button, the gasoline accumulated in the float chamber of the carburetor will be released into the air. This had the disadvantage that it reacts with the oxygen in the fuel and deteriorates, causing gum and other components to precipitate out of the gasoline, which blocks the gasoline passage hole in the carburetor, resulting in poor starting the next time it is used. In other words, engines used in seasonal agricultural machinery such as rice transplanters and harvesters are stopped and stored for several months or more.
Users are given an instruction manual that explains how to drain the residual gasoline in the float chamber of the carburetor during the period when the engine is stopped, but it is too cumbersome to do so, and there have been constant complaints about engine starting problems.
（発明の目的）
本発明の目的は、前記欠点を解消し、フロート
室の燃料を自動的にドレインすることによつて、
長期間放置の際気化器の腐食およびガソリンが変
質し次回使用時に燃料づまりによる始動不良など
を防止する気化器の燃料抜取装置を提供するにあ
る。(Object of the invention) The object of the present invention is to eliminate the above-mentioned drawbacks, and by automatically draining the fuel in the float chamber,
To provide a fuel extraction device for a carburetor which prevents corrosion of the carburetor and deterioration of gasoline when left for a long period of time, and prevents starting failure due to fuel clogging during next use.
（要旨）
本発明は、エンジン停止後、燃料コツクとこれ
に連動させて通気コツクを同時に閉鎖することに
よつて燃料タンクを密閉し、燃料タンクの温度低
下により生ずる負圧を利用して、フロート室内の
ガソリンを戻しパイプを介して自動的に抜きと
り、ガソリンタンクへガソリンをリターンするよ
うに構成したものであり、これにより気化器の腐
食やガソリンが変質劣化して、エンジンの始動不
良などの発生を防止できるようにしたものであ
る。(Summary) The present invention seals the fuel tank by simultaneously closing the fuel tank and the ventilation tank in conjunction with the fuel tank after the engine stops, and utilizes the negative pressure generated by the temperature drop in the fuel tank to float the fuel tank. The system is configured to automatically extract gasoline from the interior through a return pipe and return the gasoline to the gasoline tank. This is designed to prevent this from occurring.
（実施例）
以下図を参照して本発明に係る気化器の燃料抜
取装置の一実施例について説明する。(Embodiment) An embodiment of a fuel extraction device for a carburetor according to the present invention will be described below with reference to the drawings.
１は燃料タンク、２はタンクキヤツプ、３は通
気管、４は通気管コツク、５は燃料管、６は燃料
コツク、７は気化器、８はフロート室、９はエア
ベント、１０は戻しパイプ、１１は戻しパイプ内
ガソリンである。なおｈはフロート室８と燃料タ
ンク１とのヘツド差で、汎用小型エンジンでは一
般にｈ＝100〜200mmAq程度である。 1 is a fuel tank, 2 is a tank cap, 3 is a vent pipe, 4 is a vent pipe pot, 5 is a fuel pipe, 6 is a fuel pot, 7 is a carburetor, 8 is a float chamber, 9 is an air vent, 10 is a return pipe, 11 is gasoline in the return pipe. Note that h is the head difference between the float chamber 8 and the fuel tank 1, and in a general-purpose small engine, h is generally about 100 to 200 mmAq.
気化器７のフロート室８の底面と燃料タンク１
上面を細い戻しパイプ１０でつなぎ、燃料タンク
１の上面を通気管３を介して通気管コツク４と連
通し、さらにこの通気管コツク４と燃料コツク６
とを連動させ、燃料コツク６を開閉したときには
同時に通気管コツク４も開閉されるようになつて
いる。なお燃料タンク１には従来設けられていた
エアブリーザは設けられていない。 The bottom of the float chamber 8 of the carburetor 7 and the fuel tank 1
The top surface of the fuel tank 1 is connected with a thin return pipe 10, and the top surface of the fuel tank 1 is communicated with a ventilation pipe pot 4 via a ventilation pipe 3.
When the fuel tank 6 is opened and closed, the ventilation pipe tank 4 is also opened and closed at the same time. Note that the fuel tank 1 is not provided with an air breather, which was conventionally provided.
次に前記実施例の作用について説明する。 Next, the operation of the above embodiment will be explained.
この発明は燃料タンク１内の空気温度低下によ
り発生する負圧を利用し、フロート室８内の残留
燃料を燃料タンク１内に吸い上げ、ドレインする
ようにしたものである。しかし当初のタンク内空
気体積v0が皆無か、又は極めて少ない時には前記
吸い上げ機能は不良となるが、エンジンを運転後
停止した時には一般的にタンク上部の空気体積は
フロート室内の容積に比べて充分に大きいので、
フロート室内の残留燃料の全量を戻すことができ
る。さらに戻しパイプ内に残つた燃料もエアベン
トから吸込まれる空気のジエツトポンプ作用で確
実に燃料タンク内に戻される。 This invention utilizes the negative pressure generated by the drop in air temperature within the fuel tank 1 to suck up the residual fuel in the float chamber 8 into the fuel tank 1 and drain it. However, if the initial air volume v 0 in the tank is zero or extremely small, the suction function becomes defective, but when the engine is stopped after operation, the air volume in the upper part of the tank is generally sufficient compared to the volume in the float chamber. Because it is large,
The entire amount of residual fuel in the float chamber can be returned. Furthermore, the fuel remaining in the return pipe is reliably returned to the fuel tank by the jet pump action of the air sucked in from the air vent.
さらに又燃料の吸い上げについて細部説明をす
ると先ずエンジンスイツチを切りエンジンを停止
させ、燃料コツク６を閉とし燃料タンク１より気
化器７への燃料を遮断する。この際燃料コツク６
と連動している通気管コツク４も燃料コツク閉と
同時に閉鎖され燃料タンク１は密閉される。その
時のタンク内のガソリン蒸気を含んだ空気を完全
ガスと見なし、圧力：ｐ気圧、タンク内空気体
積：vCC（一定）、温度：273＋ｔ℃とすると、ボイ
シヤールの法則より
pv／273＋ｔ＝一定
である。今温度低下を20℃（35℃→15℃）とし元
の内圧p0＝１気圧とするとｖ＝一定であるから圧
力ｐは次のようになる。 Furthermore, to explain the details of fuel siphoning, first, the engine switch is turned off to stop the engine, and the fuel tank 6 is closed to cut off the supply of fuel from the fuel tank 1 to the carburetor 7. At this time, the fuel pot 6
The vent pipe 4 which is connected to the fuel tank 1 is also closed at the same time as the fuel tank is closed, and the fuel tank 1 is hermetically sealed. Assuming that the air containing gasoline vapor in the tank at that time is a perfect gas, the pressure is p atm, the air volume in the tank is v CC (constant), and the temperature is 273+t℃, then from Boissillard's law, pv/273+t=constant. be. Now, if the temperature decrease is 20 degrees Celsius (35 degrees Celsius → 15 degrees Celsius) and the original internal pressure p 0 =1 atmosphere, since v=constant, the pressure p will be as follows.
ｐ／273＋15＝p0／273＋15
∴ｐ＝p0288／308
従つてタンク内圧の圧力変化
Δp＝p0（288／308−１）＝−0.065po＝−671mmAq
である。又フロート室８内のガソリン液面にはエ
アベント９を介して大気圧が働いている。従つて
フロート室８内のガソリンを燃料タンクへ吸引す
る力は671mmAqであるので、タンク１とフロート
室８とのヘツド差ｈ＝100〜200mmAqがあるが、
フロート室８内のガソリンは前述のように20℃の
温度低下によるタンク内の負圧力により戻しパイ
プ１０を介してタンク内に容易に吸い上げられ
る。p/273+15=p 0 /273+15 ∴p=p 0 288/308 Therefore, the pressure change in the tank internal pressure Δp=p 0 (288/308-1)=-0.065po=-671mmAq. In addition, atmospheric pressure acts on the gasoline liquid level in the float chamber 8 via an air vent 9. Therefore, since the force to draw gasoline in the float chamber 8 into the fuel tank is 671 mmAq, there is a head difference h between the tank 1 and the float chamber 8 of 100 to 200 mmAq.
As described above, the gasoline in the float chamber 8 is easily sucked up into the tank via the return pipe 10 due to the negative pressure in the tank due to the temperature drop of 20°C.
次に前記燃料抜取装置が使用される汎用小型エ
ンジンの燃料タンク容量は、2000c.c.程度のものが
平均的の値であり、エンジンを運転後停止してフ
ロート室内の燃料を吸上げようとするときは、燃
料タンク１の燃料は一般に相当程度使用されてお
ると考えられるので、前記タンクの燃料残量を
2000c.c.の半分と仮定する。 Next, the average fuel tank capacity of a general-purpose small engine in which the above-mentioned fuel extraction device is used is about 2000cc. In this case, the fuel in fuel tank 1 is generally considered to have been used to a considerable extent, so check the remaining amount of fuel in the tank.
Assuming half of 2000c.c.
又、気化器のフロート室燃料を吸上げ前の燃料
タンク油面上の空気は、圧力po＝１気圧、その
体積v0＝1000c.c.、タンク内の空気温度低下を20℃
（35℃→15℃）とすると、フロート室８内の全ガ
ソリン量の30c.c.がタンク内に吸い上げられた後の
圧力ｐはボイルレヤールの法則より
ｐ（1000−30）／273−15＝p0×1000／273＋35
∴ｐ＝p0×1000／970×288／308
ｐ＝0.96398p0
従つてタンク内の負圧Δpは
Δp＝（0.96398−１）p0＝−0.03602p0＝−372mmAq
従つてフロート室内のガソリン全量をタンク内
に吸い上げた後もタンク内の負圧Δp＝−372.3mm
Aqあり、フロート室８とタンクとのヘツド差ｈ
＝100〜200mmAqより大きいので、20℃程度の温
度変化で前述のとおり通常一般に使用されている
汎用エンジンの気化器フロート室８内のガソリン
残量の全てを燃料タンク内に吸い上げることがで
き、充分実用性のある気化器の燃料抜取装置と断
定できる。フロート室８内のガソリンが全部タン
ク内に吸い上げられた後はタンクはエアベント
９、フロート室８、戻しパイプ１０を介して大気
と連通し、タンク内の空気圧は最終的には１気圧
となる。 In addition, the air above the oil surface of the fuel tank before sucking up the fuel in the float chamber of the carburetor has a pressure po = 1 atm, a volume v 0 = 1000c.c., and an air temperature drop in the tank of 20°C.
(35℃ → 15℃), the pressure p after 30 c.c. of the total amount of gasoline in the float chamber 8 is sucked up into the tank is p (1000-30)/273-15= p 0 ×1000/273+35 ∴p=p 0 ×1000/970×288/308 p=0.96398p 0 Therefore, the negative pressure Δp in the tank is Δp=(0.96398−1)p 0 =−0.03602p 0 =−372mmAq Therefore, even after the entire amount of gasoline in the float chamber is sucked up into the tank, the negative pressure in the tank Δp = -372.3mm
With Aq, head difference h between float chamber 8 and tank
= greater than 100 to 200 mmAq, so as mentioned above, with a temperature change of about 20°C, all of the remaining gasoline in the float chamber 8 of the carburetor of a commonly used general-purpose engine can be sucked up into the fuel tank, which is sufficient. It can be concluded that this is a practical fuel extraction device for a carburetor. After all the gasoline in the float chamber 8 has been sucked up into the tank, the tank communicates with the atmosphere via the air vent 9, the float chamber 8, and the return pipe 10, and the air pressure in the tank eventually becomes 1 atmosphere.
エンジンを始動するには両コツク６，４を開き
フロート室８に燃料を送油する。 To start the engine, both cocks 6 and 4 are opened to supply fuel to the float chamber 8.
なお、温度低下はエンジン停止によるものの外
昼夜の温度差などでも同じ作用が生じ、又エンジ
ン運転後相当時間経過すれば通常20℃以上の温度
低下が発生する。 Although the temperature drop is due to the engine being stopped, the same effect occurs due to the temperature difference between day and night outside, and a temperature drop of 20°C or more usually occurs after a considerable amount of time has passed after the engine has been started.
〔発明の効果〕
以上に述べたとおり、本発明はエンジン停止
後、燃料コツクと通気コツクを同時に閉鎖するこ
とによつて燃料タンクを密閉し、燃料タンクの温
度低下により生ずる負圧を利用してフロート室内
のガソリンを戻しパイプを介して自動的に抜きと
りガソリンタンクに返送するように構成したの
で、エンジンを長期間放置しておいても、気化器
の腐食やガソリンが変質劣化し、エンジン始動不
良などのトラブルの発生を防止する効果がある。[Effects of the Invention] As described above, the present invention seals the fuel tank by simultaneously closing the fuel tank and the ventilation tank after the engine stops, and utilizes the negative pressure generated by the temperature drop in the fuel tank. The structure is such that the gasoline in the float chamber is automatically drawn out via the return pipe and returned to the gasoline tank, so even if the engine is left unused for a long period of time, corrosion of the carburetor and deterioration of the gasoline may cause the engine to start. This has the effect of preventing problems such as defects from occurring.
図は本発明に係る実施例で自動抜取装置付のフ
ロート式気化器の断面図である。
１……燃料タンク、３……通気管、４……通気
管コツク、６……燃料コツク、８……フロート
室、１０……戻しパイプ。
The figure is a cross-sectional view of a float type vaporizer equipped with an automatic extraction device according to an embodiment of the present invention. 1...Fuel tank, 3...Vent pipe, 4...Vent pipe tip, 6...Fuel pot, 8...Float chamber, 10...Return pipe.
Claims (1)
ト式気化器に供給するエンジンにおいて、フロー
ト室上部に設けられたエアベントと、上端が燃料
タンク上部に取り付けられ下端の大気開口端に燃
料コツクと連動する通気管コツクが設けられた通
気管と、気化器のフロート室底部と燃料タンクの
上部とを連通する戻しパイプとを有してなる気化
器の燃料抜取装置。1. In an engine that automatically drops fuel from a fuel tank and supplies it to a float type carburetor, there is an air vent provided at the top of the float chamber, and an air vent that is attached to the top of the fuel tank at the top end and is connected to a fuel tank at the bottom end that opens to the atmosphere. A fuel extraction device for a carburetor, comprising a vent pipe provided with a trachea tip, and a return pipe communicating the bottom of the float chamber of the carburetor and the top of a fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8566682A JPS58202356A (en) | 1982-05-21 | 1982-05-21 | Fuel draining device in carburetor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8566682A JPS58202356A (en) | 1982-05-21 | 1982-05-21 | Fuel draining device in carburetor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58202356A JPS58202356A (en) | 1983-11-25 |
| JPH0231222B2 true JPH0231222B2 (en) | 1990-07-12 |
Family
ID=13865141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8566682A Granted JPS58202356A (en) | 1982-05-21 | 1982-05-21 | Fuel draining device in carburetor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58202356A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5751937A (en) * | 1980-09-11 | 1982-03-27 | Honda Motor Co Ltd | Starting failure preventer due to residual fuel in float chamber of carburetor |
-
1982
- 1982-05-21 JP JP8566682A patent/JPS58202356A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5751937A (en) * | 1980-09-11 | 1982-03-27 | Honda Motor Co Ltd | Starting failure preventer due to residual fuel in float chamber of carburetor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58202356A (en) | 1983-11-25 |
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