Double screw pump as a positive displacement pump, the pump suction chamber should be closely separated and discharge chamber inside.

双螺杆泵作为一种容积式泵，泵内吸入室应与排出室严密地隔开。

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Three mutual engagement of the screw in the pump cylinder for each lead of the formation of a sealed chamber, causing the seal between the suction mouth.

三根互相啮合的螺杆，在泵缸内按每个导程形成为一个密封腔，造成吸排口之间的密封。

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A shoulder sprayer comprises a box body, a gas chamber, a pump, a link rod, a rocker, a crank and a spray tube with a suction pipe.

一种背负式喷雾器，由箱体、气室、唧筒、连杆、摇杆、曲柄、带吸水管的喷管组成。

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