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隔膜泵在過程控制中的作用是接受調節(jié)器或計算機的控制信號，改變被調介質的流量，使被調參數(shù)維持在所要求的范圍內，從而達到生產(chǎn)過程的自動化。如果把自動調節(jié)系統(tǒng)與人工調節(jié)過程相比較，檢測單元是人的眼睛，調節(jié)控制單元是人的大腦，那么執(zhí)行單元—隔膜泵就是人的手和腳。要實現(xiàn)對工藝過程某一參數(shù)如溫度、壓力、流量、液位等的調節(jié)控制，都離不開隔膜泵。因此正確選擇隔膜泵在過程自動化中具有重要意義。 Diaphragm pump role in the process control is to accept the regulator control signal, or computer change modulated medium flow, make the modulated maintain within the scope of the required parameters, so as to achieve the automation of production process. If the automatic control system compared with manual adjustment process, the detection unit are the eyes of the people, to adjust the control unit is the brain of a person, then execute unit - diaphragm pump is one of the hands and feet. In order to realize the control of temperature, pressure, flow, liquid level, etc., the diaphragm pump is dependent on the process. It is therefore important to choose the diaphragm pump correctly in process automation. 1.隔膜泵的組成與分類 Composition and classification of diaphragm pumps 隔膜泵又稱控制泵，是執(zhí)行器的主要類型，通過接受調節(jié)控制單元輸出的控制信號，借助動力操作去改變流體流量。隔膜泵一般由執(zhí)行機構和閥門組成。如果按其所配執(zhí)行機構使用的動力，隔膜泵可以分為氣動、電動、液動三種，即以壓縮空氣為動力源的氣動隔膜泵，以電為動力源的電動隔膜泵，以液體介質(如油等)壓力為動力的電液動隔膜泵，另外，按其功能和特性分，還有電磁閥、電子式、智能式、現(xiàn)場總線型隔膜泵等。隔膜泵的產(chǎn)品類型很多，結構也多種多樣，而且還在不斷更新和變化。一般來說閥是通用的，既可以與氣動執(zhí)行機構匹配，也可以與電動執(zhí)行機構或其他執(zhí)行機構匹配。 Pump, diaphragm pump, also known as control is the main type of actuator, by accepting conditioning control unit of the output control signal, from engine operation to change fluid flow. Diaphragm pumps are usually composed of actuators and valves. If by their ticket enforcement agencies use the power, the diaphragm pump can be divided into pneumatic, electrical, fluid movement three, namely to compressed air to power sources pneumatic diaphragm pump, based on electric power electric diaphragm pump, as a liquid medium (such as oil) pressure as the power of electric hydraulic diaphragm pump, in addition, according to its function and feature points, and electromagnetic valves, electronic style, smart, the total linear diaphragm pump, etc. The diaphragm pump has many types of products and has a variety of structures, and is constantly updating and changing. Generally speaking, the valve is generic and can be matched with the pneumatic actuator, or with an electric actuator or other actuator. 2.隔膜泵類型的選擇 Choice of diaphragm pump type 2.1隔膜泵的閥體類型 Body type of diaphragm pump 選擇閥體的選擇是隔膜泵選擇中最重要的環(huán)節(jié)。隔膜泵閥體種類很多，常用的有直通單座、直通雙座、角形、隔膜、小流量、三通、偏心旋轉、蝶形、套筒式、球形等10種。在選擇閥門之前，要對控制過程的介質、工藝條件和參數(shù)進行細心的分析，收集足夠的數(shù)據(jù)，了解系統(tǒng)對隔膜泵的要求，根據(jù)所收集的數(shù)據(jù)來確定所要使用的閥門類型。在具體選擇時，可從以下幾方面考慮: Selecting the body is the most important part of the diaphragm pump selection. Diaphragm pump valve body is a lot of more phyletic, the commonly used is through single-seat, pass-through two-seater, angular, diaphragm, small flow rate, tee, eccentric rotating, butterfly, sleeve, spherical, etc. 10. Before you choose the valve, the control process of medium, the careful analysis of process conditions and parameters, collect enough data, understand the requirement of system of diaphragm pump, according to the collected data to determine the valve type to be used. When choosing a specific choice, consider the following: (1)閥芯形狀結構主要根據(jù)所選擇的流量特性和不平衡力等因素考慮。 (1) the shape structure of the valve is based on factors such as flow characteristics and unbalanced force. (2)耐磨損性當流體介質是含有高濃度磨損性顆粒的懸浮液時，閥芯、閥座接合面每一次關閉都會受到嚴重摩擦。因此閥門的流路要光滑，閥的內部材料要堅硬。 (2) when the fluid medium is a suspension fluid containing high levels of abrasion particles, the valve core and the seating surface of the valve are severely rubbed against each shutdown. So the valve's flow is smooth and the inside of the valve is hard.