译文：
三螺杆泵的工作原理： 螺杆泵是利用螺杆的回转来吸排液体的。中间螺杆为主动螺杆，由原动机带动回转，两边的螺杆为从动螺杆，随主动螺杆作反向旋转。主、从动螺 杆的螺纹均为双头螺纹。由于各螺杆的相互啮合以及螺杆与衬筒内壁的紧密配合，在泵的吸入口和排出口之间， 就会被分隔成一个或多个密封空间。随着螺杆的转动和啮合，这些密封空间在泵的吸入端不断形成，将吸入室中的液体封入其中，并自吸入室沿螺杆轴向连续地推移至排出端，将封闭在 各空间中的液体不断排出，犹如一螺母在螺纹回转时被不断 向前推进的情形那样，这就是螺杆泵的基本工作原理。 螺杆与壳体之间的密封面是一个空间曲面。 在这个曲面上存在着诸如ab或de之类的非密封区，并且与螺杆的凹槽部分形成许多三角形的缺口abc、def。这些三角形 的缺口构成液体的通道，使主动螺杆凹槽A与从动螺杆上的 凹槽B、C相连通。而凹槽B、C又沿着自己的螺线绕向背面， 并分别和背面的凹槽D、E相连通。由于在槽D、E与槽F(它属 于另一头螺线)相衔接的密封面上，也存在着类似于正面的三角形缺口a’b’c’，所以D、F、E也将相通。这样，凹槽ABCDEA也就组成一个“∞” 形的密封空间(如采用单头螺纹，则凹槽将顺轴向盘饶螺杆， 将吸排口贯通，无法形成密封)。不难想象，在这样的螺杆 上，将形成许多个独立的“∞”形密封空间，每一个密封空间所占有的轴向长度恰好等于累杆的导程t。因此，为了使螺杆 能吸、排油口分隔开来，螺杆的螺纹段的长度至少要大于一个导程。

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原文：
Three screw pump works: Screw is used to suction rotary screw liquid. Screw to screw the middle initiative, motivated by the original rotation, on both sides of the screw is driven screw, screw for counter-rotating with the initiative. Master and slave are double-headed screw thread threaded rod. As a result of engagement between the screw and screw and tube wall lining closely with, the pump between the inlet and outlet, will be separated into one or more of the sealed space. With the rotating screw and mesh, these seals in the pump suction space evolving, the suction chamber in which liquid enclosure and along the screw axis from the inhalation of room to move continuously push exhaust side, will be closed in the space been discharged in the liquid, like a nut when the screw rotation continued to move forward is the case, this is the basic principle of the screw pump. Seal between the screw and the shell surface is a curved surface. The existence of this surface, such as ab or de like the non-sealed area, and with the screw groove part of the formation of many gaps in the triangle abc, def. These gaps form a triangle fluid channel, so take the initiative and driven screw screw groove A groove on the B, C connected to pass. The groove B, C then along its own spiral wound to the back and the back of the groove, respectively, and D, E connected to pass. As the slot D, E and slot F (it belongs to the other end of spiral) converging sealing surface, there are also similar to the front of the triangle gap a'b'c ', so D, F, E will be connected. This groove ABCDEA also form a "∞" shape seal space (such as single head thread, the groove will be along the axial drive screw Rao, the suction port through, can not form a seal). Not difficult to imagine such a screw, to the formation of many independent "∞" shape enclosed rooms, each occupied by a sealed space exactly equal to the axial length of tired shot lead t. Therefore, in order to screw suction port separated from the oil discharge screw thread section is greater than the length of at least one lead.