公开(公告)号：US5167905A

公开(公告)日：1992-12-01

申请号：US763385

申请日：1991-09-20

申请人： Raymond M. Mentz ,  Charles D. Hanna

发明人： Raymond M. Mentz ,  Charles D. Hanna

IPC分类号： G21C13/06 ,  F22B37/22 ,  G21C13/067

CPC分类号： G21C13/067 ,  F22B37/222 ,  Y02E30/40

摘要： Apparatus for sealing or blocking conduits, such as the primary nozzles of a nuclear steam generator. The invention includes an annular bracket sealingly attached to the rim of the open end of the nozzle, the bracket having a plurality of threaded holes therein. Mounted atop the bracket is a generally circular nozzle dam that includes a first side section hingedly pivotably connected to a second side section for allowing the nozzle dam to be foldable. Removably connected to each side section is a center section, the center section and the side sections defining the generally circular nozzle dam for covering the opening defined by the annular bracket. The periphery portions of the center section and of the side sections have bores therethrough. A plurality of threaded bolts extend through the bores in the nozzle dam and into the threaded holes in the bracket for removably bolting the nozzle dam to the bracket. Interposed between the nozzle dam and the bracket is an elastomeric extrusion-resistant seal member having a plurality of apertures through the periphery thereof for receiving each bolt. As the nozzle dam is bolted to the bracket, a compressive force will act perpendicularly on the seal member. This compressive force will tend to cause the apertures of the seal member to extrude laterally outwardly away from each bolt, thus enlarging the aperture surrounding each bolt. Thus, the seal member is configured to effectively seal an imperfect seal surface and to resist extrusion such as by having laminated layers of differing hardnesses, so that the seal member will not laterally extrude away from each bolt in a manner that enlarges the aperture surrounding each bolt as the nozzle dam is tightly bolted to the bracket. The extrusion-resistant feature of the seal member provides a nozzle dam that is fluid-tight because the aperture is not enlarged.

摘要翻译： 用于密封或堵塞管道的装置，例如核蒸汽发生器的主喷嘴。 本发明包括密封地附接到喷嘴的开口端的边缘的环形支架，支架在其中具有多个螺纹孔。 安装在托架顶部的是大致圆形的喷嘴坝，其包括铰接地可枢转地连接到第二侧部的第一侧部分，用于允许喷嘴坝可折叠。 可拆卸地连接到每个侧部分是中心部分，中心部分和侧部限定用于覆盖由环形支架限定的开口的大致圆形的喷嘴坝。 中心部分和侧部分的周边部分具有穿过其中的孔。 多个螺纹螺栓延伸穿过喷嘴槽中的孔并且延伸到支架中的螺纹孔中，以将喷嘴坝可拆卸地螺栓固定在支架上。 喷嘴坝和支架之间插入有弹性体挤压密封构件，其具有穿过其周边的多个孔，用于容纳每个螺栓。 当喷嘴坝被螺栓连接到支架上时，压缩力将垂直地作用在密封构件上。 这种压缩力将倾向于导致密封构件的孔横向向外挤出远离每个螺栓，从而扩大围绕每个螺栓的孔。 因此，密封构件被构造成有效地密封不完美的密封表面并且抵抗挤出，例如通过具有不同硬度的层压层，使得密封构件将不会以扩大围绕每个螺栓的孔的方式从每个螺栓横向拉伸 螺栓，因为喷嘴坝紧紧地螺栓固定在支架上。 密封构件的抗挤压特征提供了一个流体密封的喷嘴坝，因为孔没有扩大。