Spinning method for forming pipe end
    12.
    发明授权
    Spinning method for forming pipe end 有权
    用于形成管端的纺丝方法

    公开(公告)号:US08683843B2

    公开(公告)日:2014-04-01

    申请号:US12081355

    申请日:2008-04-15

    IPC分类号: B21D19/04 B21D22/14

    CPC分类号: B21D41/04 B21D22/14

    摘要: A spinning method for forming pipe bodies of varying diameter. In the spinning method, when a necked portion is formed at the end of the pipe material by the spinning method, working rollers are restricted so as to return immediately before the pipe end instead of being allowed to axially move beyond the end of the working object pipe. The amount of diameter reduction at the pipe end is set to be smaller than that of the most diameter reduced portion connecting to the pipe end. A protruding portion of a so-called bellmouth shape is formed at the working end, thereby preventing generation of fractures originating at the working end of the base portion or the welded portion and generation of wrinkles during the spinning process.

    摘要翻译: 一种用于形成直径不同的管体的纺丝方法。 在纺丝方法中,当通过纺丝方法在管材端部形成颈缩部分时,加工辊受到限制,以便在管端之前立即返回,而不允许轴向移动超过工作对象的端部 管。 管端的直径减小量被设定为小于连接到管端的最大直径减小部分的量。 在工作端形成所谓的喇叭口形状的突出部分,从而防止在基部或焊接部分的工作端产生裂缝并产生纺丝过程中的皱纹。

    Impeller and centrifugal pump including the same
    13.
    发明授权
    Impeller and centrifugal pump including the same 有权
    叶轮和离心泵包括相同的

    公开(公告)号:US08282347B2

    公开(公告)日:2012-10-09

    申请号:US12331711

    申请日:2008-12-10

    IPC分类号: F04D29/30

    CPC分类号: F04D29/225

    摘要: An example impeller includes: an impeller body in which an internal channel is formed, the internal channel extending inside the impeller body in a direction of a rotation axis spirally about the rotation axis to connect an inlet and an outlet; and at least one centrifugal vane provided in the impeller body. The internal channel including the inlet and the outlet has a predetermined passage diameter. An external channel is formed so as to continue to the outlet and go around the circumferential surface of the impeller body, the external channel being defined by the centrifugal vane and being recessed inward in the radial direction from the circumferential surface of the impeller body. At least a part in a flow direction of the external channel has a channel width in the direction of the rotation axis smaller than the width of the outlet.

    摘要翻译: 示例性叶轮包括:叶轮体,其中形成有内部通道,所述内部通道在叶轮本体内沿旋转轴线的方向围绕旋转轴线螺旋地延伸以连接入口和出口; 以及设置在叶轮本体中的至少一个离心叶片。 包括入口和出口的内部通道具有预定的通道直径。 外部通道形成为继续出口并绕着叶轮本体的圆周表面,外部通道由离心叶片限定,并且从叶轮本体的圆周表面沿径向向内凹陷。 外部通道的流动方向上的至少一部分具有在旋转轴线方向上小于出口宽度的通道宽度。