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双向齿轮泵的工作原理：
一对相互啮合的齿轮和泵缸把吸入腔和排出腔隔开。齿轮转动时，吸入腔侧轮齿相互脱开处的齿间容积逐渐增大，压力降低，液体在压差作用下进入齿间。随着齿轮的转动，一个个齿间的液体被带至排出腔。这时排出腔侧轮齿啮合处的齿间容积逐渐缩小，而将液体排出。齿轮泵适用于输送不含固体颗粒，无腐蚀性，粘度范围较大的润滑性液体。泵的流量可至300米3/时，压力可达3×107帕。它通常用作 液压泵 和输送各类油品。
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The working principle of a bidirectional gear pump:
A pair of meshing gears and pump cylinders separate the suction and discharge chambers. When the gear rotates, the volume between the teeth at the separation point of the suction chamber side teeth gradually increases, the pressure decreases, and the liquid enters the teeth under the pressure difference. As the gears rotate, the liquid between each tooth is carried to the discharge chamber. At this point, the volume between the teeth at the meshing point of the gear teeth on the discharge chamber gradually decreases, and the liquid is discharged. Gear pumps are suitable for conveying lubricating liquids that do not contain solid particles, are non corrosive, and have a wide viscosity range. The flow rate of the pump can reach 300 m3/h, and the pressure can reach 3 × 107 Pa. It is usually used as a hydraulic pump and to transport various types of oil products.
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