发明描述-中英对照
FIELD OF THE INVENTION 发明的领域范围
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.
本发明与流体反应出口控制阀有选择性的在汽车燃料箱中被使用，以便从燃料箱中放出汽油蒸汽到除水阀内，功能就像碳罐一样。更特别的是，本发明是使用摇晃止回阀，具有大流量出口，通过剥离式机械装置开启。
BACKGROUND OF THE INVENTION 发明的背景
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.
众所周知，摇晃止回阀从汽车燃料箱中排出汽油蒸汽到大气中，最近新式的是排出到蒸汽防御系统的技术，功能如碳罐一样。当燃料箱中的燃料低于阀水平时，这样的阀可以排出燃料箱内的物质到碳罐中去，且当燃料在摇晃止回阀中膨胀时，是利用漂浮物来关闭它。关闭与水平上升的液体燃料的相关阀门阻止了流体燃料溢出到碳罐中。如果填充控制出口阀，而非摇晃止回阀，对于全燃料箱水位的关闭而非膨胀部分，且根据在燃料箱之内的压力水头中的结果来操作安装在燃料填充喷嘴中的自动关闭设备。
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的美国专利编号4,753,262，于1988年6月28日公布，摇晃止回阀具有排气出口，以显示剥离阀碟片关闭。当液体燃料到达阀漂浮物高度时，外力迫使阀碟片与排气出口相对，因此关闭它以阻止燃料到达罐。当燃料滴出来时，为了确保阀的正面开启，浮动物和结构将阀片与其相，以结构圆周形地操作杠杆或将阀片从排出口剥离开。
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.
正如上述举例专利所描述的，通过阀到罐需要增加排气阀面积的原理，加快来自于燃料箱的蒸汽流量的速率。一旦燃料水位下降时，给阀提供一个大的排气出口以增加力度来维持在关闭位置上的阀，即：排出口的面积越大，由于燃料箱/碳罐的压力差异引起，在阀片上关闭的力量也就越大。用大排气出口和相应的阀片以负荷实际的燃料箱/碳罐压力差异，尽管燃料水平不断下降，漂浮物仍然“悬起”。阀可以保持关闭状态，导致在未放气的燃料箱内压力的迅速形成。
SUMMARY OF THE INVENTION 发明概要
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.
本发明是液体反应，高体积摇晃止回阀，被用于从汽车燃料箱中排出汽油蒸汽到蒸汽罐中。本发明的阀为排出口提供了一个正面的关闭密封，对燃料上涨和摇晃止回情况做出反映，当燃料上涨减退或阀返回正常状态时，存在一个强大的开启力足够打破密封和阀件。
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.
以上的物体都通过安装于汽车燃料箱壁内的空心排气阀完成的，在燃料箱内部较低的部分有通风入口，上部分有与蒸汽罐相连的大体积排气出口。漂浮物被安装在阀体较低的部分中，以便在较低的开口部分和较高的关闭部分上升或下降，对应液体燃料的上升或摇晃止回情况。漂浮控制剥离阀心，与排出口连接以打开或关闭出口。
2014.9.8