發(fā)明描述-中英對照

FIELD OF THE INVENTION 發(fā)明的領(lǐng)域范圍

The present invention relates to fluid-responsive vent control valves for use in vehicle fuel tanks to selectively vent fuel vapor from the tank to a vapor trap such as a carbon canister. More specifically, the present invention is a fluid-responsive rollover vent control valve having a high flow outlet opened by a peel-away mechanism.
本發(fā)明與流體反應(yīng)出口控制閥有選擇性的在汽車燃料箱中被使用，以便從燃料箱中放出汽油蒸汽到除水閥內(nèi)，功能就像碳罐一樣。更特別的是，本發(fā)明是使用搖晃止回閥，具有大流量出口，通過剝離式機(jī)械裝置開啟。

BACKGROUND OF THE INVENTION 發(fā)明的背景

Rollover vent valves are well known in the art for venting fuel vapor from a vehicle fuel tank to the atmosphere or, more recently, to a vapor recovery system such as a carbon canister. Such valves typically vent the interior of the fuel tank to the carbon canister when the fuel in the tank is below the level of the valve, and are closed by a float when the fuel surges in a rollover situation. Closing the valve in response to surging liquid fuel level prevents the overflow of liquid fuel into the carbon canister. If employed as a fill-control vent valve, rather than a rollover vent valve, closure is in response to a full fuel level rather than surge and results in a pressure head within the fuel tank and filler pipe to operate automatic shutoff apparatus built into the fuel fill nozzle.
眾所周知，搖晃止回閥從汽車燃料箱中排出汽油蒸汽到大氣中，最近新式的是排出到蒸汽防御系統(tǒng)的技術(shù)，功能如碳罐一樣。當(dāng)燃料箱中的燃料低于閥水平時，這樣的閥可以排出燃料箱內(nèi)的物質(zhì)到碳罐中去，且當(dāng)燃料在搖晃止回閥中膨脹時，是利用漂浮物來關(guān)閉它。關(guān)閉與水平上升的液體燃料的相關(guān)閥門阻止了流體燃料溢出到碳罐中。如果填充控制出口閥，而非搖晃止回閥，對于全燃料箱水位的關(guān)閉而非膨脹部分，且根據(jù)在燃料箱之內(nèi)的壓力水頭中的結(jié)果來操作安裝在燃料填充噴嘴中的自動關(guān)閉設(shè)備。
In U.S. Pat. No. 4,753,262 to R. Bergsma, issued Jun. 28, 1988, a rollover vent valve having a venting outlet closed by a peel-away valve disc is disclosed. When liquid fuel reaches the valve a float member is raised to force the valve disc against the vent outlet, thereby closing it to prevent fuel from reaching the canister. In order to ensure positive opening of the valve when the fuel level drops, the float and the structure connecting it to the valve plate operate to circumferentially lever or peel the valve plate off the vent outlet.
R. Bergsma的美國專利編號4,753,262，于1988年6月28日公布，搖晃止回閥具有排氣出口，以顯示剝離閥碟片關(guān)閉。當(dāng)液體燃料到達(dá)閥漂浮物高度時，外力迫使閥碟片與排氣出口相對，因此關(guān)閉它以阻止燃料到達(dá)罐。當(dāng)燃料滴出來時，為了確保閥的正面開啟，浮動物和結(jié)構(gòu)將閥片與其相，以結(jié)構(gòu)圓周形地操作杠桿或?qū)㈤y片從排出口剝離開。
As noted in the above-cited patent, increasing the rate of vapor flow from the fuel tank through the valve to the canister requires an increase in the area of the valve vent outlet. Providing the valve with a large vent outlet increases the force acting to maintain the valve in the closed position once the fuel level drops; i.e., the greater the area of the vent outlet, the greater the closing force on the valve plate caused by the tank/canister pressure differential. With a large vent outlet and corresponding valve plate subjected to a substantial tank/canister pressure differential, the float can "hang-up" despite a drop in the fuel level. The valve would then remain closed, resulting in a rapid and undesirable buildup of pressure in the unvented tank.
正如上述舉例專利所描述的，通過閥到罐需要增加排氣閥面積的原理，加快來自于燃料箱的蒸汽流量的速率。一旦燃料水位下降時，給閥提供一個大的排氣出口以增加力度來維持在關(guān)閉位置上的閥，即：排出口的面積越大，由于燃料箱/碳罐的壓力差異引起，在閥片上關(guān)閉的力量也就越大。用大排氣出口和相應(yīng)的閥片以負(fù)荷實際的燃料箱/碳罐壓力差異，盡管燃料水平不斷下降，漂浮物仍然“懸起”。閥可以保持關(guān)閉狀態(tài)，導(dǎo)致在未放氣的燃料箱內(nèi)壓力的迅速形成。
SUMMARY OF THE INVENTION 發(fā)明概要

The present invention is a fluid-responsive, high volume rollover vent valve for use in the fuel tank of a vehicle to vent fuel vapor from the tank to a vapor canister. The valve of the present invention provides a positive closing seal for the vent outlet in response to fuel surge, and in rollover situations, as well as a powerful opening force to break that seal and open the valve when the fuel surge recedes or the valve returns to a normal attitude.
本發(fā)明是液體反應(yīng)，高體積搖晃止回閥，被用于從汽車燃料箱中排出汽油蒸汽到蒸汽罐中。本發(fā)明的閥為排出口提供了一個正面的關(guān)閉密封，對燃料上漲和搖晃止回情況做出反映，當(dāng)燃料上漲減退或閥返回正常狀態(tài)時，存在一個強(qiáng)大的開啟力足夠打破密封和閥件。
The above objects are achieved with a hollow vent valve mounted in the wall of a vehicle fuel tank, having a lower portion with a venting inlet in the interior of the tank, and an upper portion with a high volume venting outlet connected to the vapor canister. A float member is mounted in the lower portion of the valve body to ride up and down therein between a lower open position, and an upper closed position in response to liquid fuel surges or a rollover situation. The float controls a peel-away valve element associated with the vent outlet to open and close the vent.
以上的物體都通過安裝于汽車燃料箱壁內(nèi)的空心排氣閥完成的，在燃料箱內(nèi)部較低的部分有通風(fēng)入口，上部分有與蒸汽罐相連的大體積排氣出口。漂浮物被安裝在閥體較低的部分中，以便在較低的開口部分和較高的關(guān)閉部分上升或下降，對應(yīng)液體燃料的上升或搖晃止回情況。漂浮控制剝離閥心，與排出口連接以打開或關(guān)閉出口。

2014.9.8