原文：
gear pump依靠泵缸与啮合齿轮间所形成的工作容积变化和移动来输送液体或使之增压的回转泵。 外啮合双齿轮泵的结构。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。齿轮泵结构简单紧凑,制造容易,维护方便，有自吸能力，但流量、压力脉动较大且噪声大。齿轮泵必须配带安全阀，以防止由于某种原因如排出管堵塞使泵的出口压力超过容许值而损坏泵或原动机。 （一）、工作原理： 齿轮泵是容积泵的一种，由两个齿轮、泵体与前后盖组成两个封闭空间，当齿轮转动时，齿轮脱开侧的空间的体积从小变大，形成真空，将液体吸入，齿轮啮合侧的空间的体积从大变小，而将液体挤入管路中去。吸入腔与排出腔是靠两个齿轮的啮合线来隔开的。 齿轮泵的排出口的压力xx取决于泵出处阻力的大小。 （二）、运行维护 1、起动： （1）启动前检查全部管路法兰，接头的密封性。 （2）盘动联轴器，无摩擦及碰撞声音。 （3）首次启动应向泵内注入输送液体。 （4）启动前应全开吸入和排出管路中的阀门，严禁闭阀启动。 （5）验证电机转动方向后，启动电机。 2、停车： （1）关闭电动机。 （2）关闭泵的进、出口阀门。

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译文：
gear pump and gear to rely on pump cylinder formed between the work of volume change and move the transmission so that pressurized liquid or rotary pump. Double gear pump with external mesh structure. A pair of mutually meshing gears and pump cylinder to separate the suction chamber and discharge chamber. Gears, the suction side of the tooth cavity of mutual disengagement Department interdental volume increases, pressure drop, liquid under pressure to enter between teeth. As the gears rotate, the liquid between teeth one by one to be brought to the discharge chamber. Then the side discharge chamber volume between teeth tooth contact Department gradually reduced, while the liquid effluent. Gear pump for conveying solid particles, non-corrosive, lubricant viscosity, the larger the scope of liquid. Pump flow can be up to 300 m 3 / hour, up to 3 × 107 Pa pressure. It is usually used to transport various types of hydraulic pumps and oil. Gear pump is compact in structure, easy to manufacture, easy to maintain, with self-absorption capacity, but traffic, a larger pressure fluctuation and noisy. Gear pumps must be equipped with safety valve to prevent the discharge tube for some reason, such as blocking the pump's outlet pressure exceed the allowable value of the damaged pump or prime mover. (A), it works: Gear pump is a volumetric pump, two gear, pump body and cover before and after the composition of two closed space, when the gears, the gears disengaged side of the small size of the space larger, forming a vacuum, liquid inhalation, gear volume meshing from the side of the space into small, while the liquid to squeeze into the pipe. Inhalation chamber and discharge chamber is by two gears meshing lines separated. Gear pump outlet pressure depends entirely on the size of the pump source of resistance. (B), operation and maintenance 1, start: (1) pre-check all the piping flanges, joint sealing. (2) dynamic coupling drive, no friction and impact sound. (3) The first start should pump into the transmission fluid. (4) should be fully open before the start of suction and discharge pipe valves, non-closing valve started. (5) verify the motor rotation direction, start the motor. 2, Parking: (1) close the motor. (2) Turn off the pump inlet and outlet valves.