正压输送和负压输送是两种不同的物料输送方式，它们在 输送原理、应用范围、系统特点以及适用物料等方面存在明显的区别 。

　　Positive pressure conveying and negative pressure conveying are two different methods of material conveying, which have significant differences in conveying principles, application scope, system characteristics, and applicable materials.

　　输送原理 ：

　　Transport principle:

　　正压输送 ：利用输送系统前端的风机向输送管道内通入压缩空气，利用管道起点与终点的压力差，使空气在管道内流动并带动物料运动。物料在输送终点与空气分离。

　　Positive pressure conveying: Use the fan at the front end of the conveying system to introduce compressed air into the conveying pipeline, and use the pressure difference between the starting and ending points of the pipeline to make the air flow inside the pipeline and move the animal material. The material separates from the air at the end of transportation.

　　负压输送 ：通过输送系统末端的引风装置运转时形成负压，利用外界大气压力与系统内的负压差作为动力，将物料吸入管道并随气流到达终点，通过过滤分离。

　　Negative pressure conveying: When the induced draft device at the end of the conveying system operates, negative pressure is formed, and the external atmospheric pressure and the negative pressure difference inside the system are used as power to suck the material into the pipeline and reach the end point with the airflow. Finally, it is separated by filtration.

　　应用范围 ：

　　Application scope:

　　正压输送 ：适用于分散输送，即一点向多点输送，适用于粉状物、颗粒状物料或液体的输送，输送距离较长，且具有漏气检查和处理方便的特点。

　　Positive pressure conveying: suitable for dispersed conveying, that is, conveying from one point to multiple points, suitable for conveying powder, granular materials or liquids, with a long conveying distance and convenient air leakage inspection and handling.

　　负压输送 ：多用于集中式输送，即多点向一点输送，适用于易吸潮、易扬尘及易氧化变质的物料，特别适用于有毒有害、有刺激气味的物料输送。由于负压抽吸，无物料泄漏风险，且输送距离较短。

　　Negative pressure conveying: commonly used for centralized conveying, that is, multi-point to one point conveying, suitable for materials that are prone to moisture absorption, dust lifting, and oxidation deterioration, especially suitable for conveying toxic, harmful, and pungent materials. Due to negative pressure suction, there is no risk of material leakage and the conveying distance is relatively short.

　　系统特点 ：

　　System features:

　　正压输送 ：系统内部为正压状态，物料易从排料口卸出，输送过程中压力较高，适用于长距离输送，且对风机的磨损相对较轻。

　　Positive pressure conveying: The system is in a positive pressure state internally, and materials are easily discharged from the discharge port. During the conveying process, the pressure is high, making it suitable for long-distance conveying, and the wear on the fan is relatively light.

　　负压输送 ：系统内部为真空状态，密封性能较好，适用于短距离输送，且能够有效避免物料泄漏到大气中，适用于有毒有害物料的输送。

　　Negative pressure conveying: The system is in a vacuum state with good sealing performance, suitable for short distance conveying, and can effectively prevent material leakage into the atmosphere. It is suitable for conveying toxic and harmful materials.

　　适用物料 ：

　　Applicable materials:

　　正压输送 ：适合输送干燥、易流动及密度较大的散装物料，如粮食、化工原料等。

　　Positive pressure conveying: suitable for conveying dry, flowable, and high-density bulk materials, such as grains, chemical raw materials, etc.

　　负压输送 ：适合输送易吸潮、易扬尘及易氧化变质的物料，如粉状物料、工业粉尘等，特别适用于对要求较高的场合。

　　Negative pressure conveying: suitable for conveying materials that are prone to moisture absorption, dust lifting, and oxidation deterioration, such as powdered materials, industrial dust, etc., especially suitable for occasions with high environmental requirements.

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