容积式电动泵是依靠高速旋转的齿轮、旋板等的机械作用，对液体强行压挤而使液体的压力和流速增大。齿轮泵具有结构简单、工作可靠、制作容易、低廉等特点，因而在航空上有着广泛的应用。
Volume type electric pump is a mechanical action on high speed rotating gear, rotary plate, the liquid and the liquid pressure extrusion force and velocity increases. Gear pump has the characteristics of simple structure, reliable work, easy to manufacture, low price and so on, so it has a wide application in aviation.
齿轮泵有一对相互啮合的齿轮安装于壳体内部，齿轮的两端面靠端盖密封。齿轮把壳体内分为互不相通的A腔和B腔，在壳体上开有两个孔，分别和A腔、B腔相通。
The gear pump has a pair of intermeshing gears in the interior of the shell, and the ends of the gear are sealed by the end cover. The gear is divided into an interconnected A cavity and a B cavity. There are two holes on the shell, which are connected to the A cavity and the B cavity respectively.
当齿轮按方向旋转时，在A腔，由于一对齿脱开，使该腔容积逐渐增大，形成局部真空，油箱中的油液在外界大气压力的作用下，经油管、壳体进入A腔，吸到A腔齿间的油液在密封的空间中，随齿轮转动沿壳体内壁带入B腔填满油液的齿间，由于齿的啮合，使该腔容积逐渐减少，把齿间油液挤压出去，曰腔就是增压油腔。当齿轮不断旋转，则A、B两腔不断地压、吸油和排油，这就是齿轮泵的工作原理。
When the gear according to the direction of rotation, in the A cavity, because of a pair of gears disengaged, so that the cavity volume increases, the formation of partial vacuum, the oil tank under atmospheric pressure under the action of A into the cavity through the tubing and casing, sucked into the A cavity gear oil in the sealed space. Along with the rotation of the gear along the inner wall of the shell into the B cavity filled with fluid between teeth, because of tooth, the cavity volume gradually reduced, the tooth oil squeezed out, said the chamber is pressurized oil cavity. When the gear rotation, A, B two cavity constant pressure, oil absorption and oil discharge, this is the working principle of the gear pump.
在齿轮泵中，吸油腔低于大气压力，各齿间的油液压力随齿间的位置变化而不同，文章由宁波泽德水泵整理越靠近吸油腔部分的齿间，油液压力越低；越靠近增压油腔部分的齿间，油液压力越高。所以各齿间油液压力是从吸油腔到增压油腔而递增的，到增压油腔时，则压力为高压腔中的压力。
In the gear pump, the suction chamber is lower than atmospheric pressure, the oil pressure of each teeth vary with position between teeth and different articles by Ningbo Zehnder pump suction chamber is close to the finishing part of the teeth, the oil pressure is low; the more close to the pressurized oil cavity part of the tooth, the oil pressure is high. So the oil pressure between each tooth is increased from the oil suction chamber to the pressurized oil chamber, and the pressure is the pressure in the high pressure chamber when the oil chamber is pressurized.
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