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原文：
  一般来说，齿轮泵的泵壳越重，其耐温度、耐压强度也越高。泵体材料常采用球墨铸铁，亦可采用铸造铝合金硬模熔铸而成，或采用挤压铝合金型材加工制造。当输送的介质具有腐蚀性时，可采用成本较高的不锈钢材料。国外高粘度齿轮泵多采用含镍、铬量高的合金钢作为泵壳材料，这种材料在强度、可靠性及成本方面的综合性能较好。为解决齿轮泵的困油现象，通常在泵盖上开设对称的卸荷槽，或向低压侧方向开设不对称卸荷槽，吸液侧采用锥形卸荷槽，排液侧为矩形卸荷槽，卸荷槽的深度也比液压工业中所用的齿轮泵要深。 　　由于高粘度齿轮泵输送的介质粘度较高，为减小流动阻力，提高泵的吸液能力，必须对介质进行加热或保温。通常采用电热元件加热，可使粘性液体受热均匀。若温度波动不大，输送的高粘度液体容易发生降解时，建议采用流体加热方式，特别是排量大的齿轮泵。流体加热又分内置、外置式结构。所谓内置式是指在齿轮泵泵体或端盖的内部设计突热套，外置式则是通过螺栓将夹热套与泵体联接在一起。往夹套内通入蒸汽、导热油，还是冷却水，要根据介质具体情况而定。内置式适用于对输送液体温度均匀性要求较高，或要求对高温液体进行均匀冷却的场合。当电加热方式缺乏安全性或对温度控制要求不高时，可采用外置式结构。美国 VIKING公司生产的内啮合齿轮泵，其泵头部分的夹套可以对输送流体的温度进行控制，无论是在高温或低温环境下，均可带外置式夹套。

“ Gear pump heating”是由中国磁力泵网提供的水泵行业新闻，译文仅供参考。另外，中国磁力泵网还提供相关产品搜索：磁力泵型号、磁力泵价格、磁力泵技术、磁力泵新闻、磁力泵生产商等。

译文：
Gear pump heating In general, the gear pump casing heavier, and its resistance to temperature, the higher the compressive strength. Ductile iron pump body material is often used, we can use die cast from aluminum alloy or aluminum alloy extrusion processing. When the transmission medium is corrosive, the high cost of stainless steel can be used. Foreign high viscosity gear pumps use more nickel, high chromium alloy steel as a pump casing material, this material in strength, reliability and cost of the overall performance is better. To address the difficulties gear pump oil phenomenon, usually symmetrical in the pump cover up the unloading bay, or up to the low pressure side of the direction of the asymmetry of unloading tank, the suction side of the unloading tank with a tapered, rectangular liquid discharge side of the unloading groove, unloading groove depth than used in industrial hydraulic gear pump to be deep. Due to the high viscosity gear pump high viscosity of the transmission medium, in order to reduce flow resistance, the ability to improve the suction pump, the need for heating or insulation media. Commonly used electric heating elements, a viscous liquid can heat evenly. If the temperature fluctuations in small, high-viscosity transmission fluid prone to degradation, the heating fluid is recommended, especially large displacement gear pump. Fluid heating is divided internal, external structure. The so-called built-in gear pump is the pump or cover sudden heat of interior design sets, external bolt through the clip is set with heat pump connected together. To pass into the steam jacket, oil, or cooling water, according to media specific circumstances. Built-in suitable for the transport of liquid high temperature uniformity requirements, or require a uniform high-temperature liquid cooling applications. When electric heating safety or lack of temperature control is not critical, can be an external structure. U.S. VIKING produced internal gear pump, the pump head can be part of the jacket to control the transmission fluid temperature, whether in high or low temperature environment, may bring external jacket.

“Circulation pump to "grab warm" heat up a cold N home ”是由中国磁力泵网提供的国际水泵新闻，译文仅供参考。另外，中国磁力泵 网还提供相关产品搜索：

• 热水管道泵维护
• 利欧股份拟4500万收购无锡锡泵58%股权
• 水泵跳闸故障的排除方法

原文来源：http://www.1cilibeng.com/

2011-12-27 08:45

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