原文：
许多密封化合物中的添加剂磨蚀性非常强，寻找能够顺利输送这种磨蚀性化合物的计量泵比以往更具挑战性。但是，现在已有一些采用各种泵型的可靠的无破坏的解决方案。 聚氨酯密封化合物在电子行业有多种用途，例如保护塑料电器外壳、控制单元、工业照明光源、传感器等免受灰尘、湿气和不必要的干扰。为确保它们有效发挥作用，这些系统的制造商使用各种各样的填料，扩展了塑料材料的性能。 但是，这些添加剂为使用密封化合物的公司带来了一个问题：如何找到能够顺利输送这些化合物的计量泵。 电子部件的密封过程已经相当成熟。单组分或双组分密封化合物是通进低压混合计量系统进行处理和添加的。计量泵是这些系统的重要组成部分。它的任务是将密封化合物以xx的流量无破坏的泵送到混合设备中。市场上有各种连续运转和间歇运转的泵，但两种泵都有优缺点。泵型的选择通常取决于材料的粘度、磨蚀性和所需的流量。 一台齿轮泵和螺杆泵的长期比较结果。材料：聚氨酯密封化合物；填料：无磨蚀，添加比例66%；颗粒尺寸：16祄；粘度：20,000±1,000mPas；密度：1.64-1.68g/cm3。 计量泵的比较 下面所列举的泵都是以体积计量为原理的，可以xx控制材料的特定排量。而定时压力计量，体积和物质流量取决于压力和粘度。用于密封化合物计量的泵型包括： ◆齿轮泵（内齿轮或外齿轮） ◆螺杆泵 ◆软管泵 ◆活塞泵 齿轮泵—最xx的计量泵之一，非常适用于轻微磨蚀的材料的计量，无论这种材料（从液体到浆料）是否添加了固体填料。耐磨的涂层和特别设计的齿轮齿形有助于延长泵的使用寿命。外齿轮泵的泵送流量可达0.1cm3/转，计量压力可达100bar。对于更小的泵送体积，也可采用内齿轮泵。这种泵非常紧凑。内齿轮泵与混合系统相连，计量剂量为20mg（最小计量剂量为1mg）时，可以达到±1%的计量精度。 螺杆泵—非常适用于计量各种高低粘度的液体和浆料。这种泵不容易引起材料的破坏，对于填料或磨蚀性材料也不敏感。但是，螺杆泵无法达到齿轮泵的计量精度和灵活性，因为它们具有较高的压力。因此，螺杆泵的泵送体积不能小于1cm3，压力{zg}为40bar。 软管泵—只适用于低精度的计量，因为软管对压力非常敏感。它们是计量含有填料的磨蚀性材料的一种经济方案。 活塞泵—适用于几乎所有的液体或浆料。活塞将材料推出缸体，一定的计量次数后，材料会重新填充缸体。泵的型号根据应用的不同而改变。 富于挑战性的需求 电子元件对塑料化学性能的要求使得制造商不得不在环氧树脂、有机硅和聚氨酯密封化合物中添加填料，以获得材料所需性能。这也就产生了一种固体、不同液相和粘性结构的混合物，对于计量泵来说是一大挑战。对于下列填料必须特别注意： ◆白垩石 ◆氢氧化铝 ◆石英粉 ◆干燥剂/商业吸收剂（沸石） ◆触变剂 ◆中空微球 这些材料会对计量泵造成损坏。但是，泵可能也会改变材料的特性。这通常是渐进的过程，很难提前察觉，通常是在材料通过错误尺寸的部件时造成的。 在设计液压回路时，必须考虑下列因素： ◆恒定的流速 ◆为理想流速设计的管道 ◆较低的压力 ◆尽可能减小材料的剪切力 这些因素在选择泵时是{zy}先考虑的。 但是，还有其他一些决定性因素，例如： ◆计量时间 ◆体积流速 ◆精度 ◆处理顺序 ◆计量温度 三种不同的泵型比较结果可以看出，在计量多羟基化合物（密度1.6g/cm3，粘度15,000mPas）时，活塞泵的分散性{zh0}，因此从机械性能来讲，是{zh0}的解决方案。 一台齿轮泵和螺杆泵的长期比较结果。所输送的物质是聚氨酯密封化合物，其中无磨蚀性填料（66%）的颗粒尺寸为16祄。化合物粘度为20,000±1,000mPas，密度为1.64-1.68g/cm3。 结论 经验表明活塞泵具有最长的使用寿命和{zg}的精度，但齿轮泵是一个很好的替代方案，因为它们比活塞泵和螺杆泵xxx更高，可以连续运转。螺杆泵也适用于含有填的料物质的连续计量。从这方面讲泵的好坏没有区别。 决定性因素是系统的需求。如果不止一种泵可选，那么个人喜好、物流因素都会在决策过程中产生影响。

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译文：
Many sealing compound abrasive additives are very strong, looking for a smooth delivery of such compounds abrasive metering pump is more challenging than ever. But now there has been some type of reliability using a variety of pump failure-free solution. Polyurethane sealing compounds have many uses in the electronics industry, such as protection of plastic electrical enclosures, control units, industrial lighting, sensors from dust, moisture and unnecessary interference. In order to ensure their effective functioning, the manufacturer of these systems use a variety of filler, expanded plastic material properties. However, these additives for the use of sealing compounds of the firm with a problem: how to find the smooth transport of these compounds metering pumps. Electronic components, sealing process is already quite mature. Single component or two-component sealing compounds pass into the low pressure mixing and metering system for processing added. Metering pump is an important component of these systems. Its mission is to sealing compounds to precise flow without damage pumped to mixing equipment. There will be a variety of continuous operation and intermittent operation of the pump, but the two pumps have advantages and disadvantages. Pump selection usually depends on the material viscosity, abrasive, and the flow rate. Gear pumps and screw pumps a long-term results of the comparison. Material: Polyurethane sealing compounds; filler: no erosion, adding the proportion of 66%; particle size: 16 Xie; Viscosity: 20,000 ± 1,000 mPas; density :1.64-1 .68g/cm3. Comparison of metering pumps The following pumps are listed as the principle of volume measurement can be precise control of material-specific emissions. The time pressure measurement, volume and material flow depends on pressure and viscosity. Used to measure the pump sealing compounds, including: ◆ gear pump (internal gear or outer gear) ◆ Screw ◆ hose pump ◆ piston pump Gear pump - one of the most accurate metering pump is very suitable for the measurement of minor abrasion of the material, whether such material (from liquid to paste) is added with a solid filler. Wear-resistant coating and a specially designed gears help extend the pump life. External gear pump pump flow up to 0.1cm3 / switch, measuring pressure up to 100bar. For smaller pump size, also can be used in gear pumps. This pump is very compact. Internal gear pump is connected with the hybrid system, measured dose of 20mg (minimum measured dose of 1mg), you can achieve the measurement accuracy of ± 1%. Screw pump - very suitable for measuring all kinds of high and low viscosity liquids and pastes. This pump is not easy to cause material damage to the filler or abrasive materials are not sensitive. However, the screw pump gear pump can not reach the measurement precision and flexibility, because they have a higher pressure. Therefore, the screw pump of the pumping volume can not be less than 1cm3, pressure up to 40bar. Hose pump - only applicable to low accuracy of measurement, because the hose is very sensitive to pressure. They are measuring the abrasive filler material containing an economic program. Piston pump - for almost all of the liquid or slurry. The material release cylinder piston, a certain number of times of measurement, the material will be re-filled cylinder. Pump models change depending on the application. Challenging needs Electronic components on the chemical properties of plastics demand allows manufacturers to have in epoxy resin, silicone and polyurethane sealing compounds add filler to get the required material properties. It also produced a solid, liquid and viscous structure of different mixtures, the metering pump is a major challenge. Must pay special attention for the following packing: ◆ chalk stone ◆ Aluminum Hydroxide ◆ quartz powder ◆ Desiccant / commercial absorbent (zeolite) ◆ thixotropic agent ◆ hollow microspheres These materials will damage the metering pump. However, the pump may also change the properties of the materials. This is usually a gradual process, it is difficult to detect in advance, usually in the material by mistake when the size of the components caused. In the design of hydraulic circuit, we must consider the following factors: ◆ constant velocity ◆ Design for the ideal channel for the flow rate ◆ lower pressure ◆ minimize the shear force of materials These factors in the choice of pump is the top priority. However, there are other decisive factors, such as: ◆ Measuring time ◆ volume flow rate ◆ Accuracy ◆ processing sequence ◆ Temperature measurement Comparison of three different pump results can be seen in the measurement of polyols (density 1.6g/cm3, viscosity 15,000 mPas), the piston pump of the dispersion of the best mechanical properties result from speaking, is the best solution. Gear pumps and screw pumps a long-term comparison. The transport of material is polyurethane sealing compounds, including non-abrasive filler (66%) of the particle size of 16 Xie. Compound viscosity of 20,000 ± 1,000 mPas, density 1.64-1.68g/cm3. Conclusion Experience has shown that the piston pump has the longest life and maximum precision, but the gear pump is a good alternative, because they are cost-effective than the higher piston pumps and screw pumps can run continuously. Screw pump is also suitable for the material containing filling material and the continuous measurement. In this regard no distinction between good and bad about pump. Decisive factor is the system requirements. If more than one pump optional, so personal preference, logistics factors will influence the decision making process.