液压隔膜计量泵的结构原理及泵体冻结的解决方法
常见故障及解决方法：
1、吸入阀或排出阀中有杂质如果吸入阀中有杂质，在泵的排出行程中，吸入阀不会完全关闭，形成泵送介质全部或部分回流的现象，造成泵无流量或流量不足。如果排出阀中有杂质，在泵的吸入行程中，它不会完全关闭，形成排出介质全部或部分回流的现象，也会造成泵的无流量或流量不足。这个问题可以通过清洗吸入阀和排出阀来解决。
2、吸入阀和排出阀磨损严重。如果吸入阀和排出阀磨损严重，密封不会失效，形成与1相同的介质回流条件。如果发生这种情况。能及时更换alwater液压隔膜泵吸入阀和排出阀的相关磨损件，实现ALIWATER液压隔膜计量泵的正常运行。
3、吸入阀和排出阀反向安装。如果吸入阀和排出阀反向安装，则不会出现流动现象，因此在清洗吸入阀和排出阀后，必须按泵的原安装顺序安装。
如果泵冻结了怎么办？
一般来说，可以用热毛巾热敷。如果计量泵外的温度很低，可以用温水倒水，但不能用开水（因为开水会增加冷热差，容易使泵体开裂）。
液压隔膜计量泵的结构原理：
液压隔膜计量泵由电机驱动机构和液压系统组成。
2.1传动机构
2.1.1电动机的动力传递给蜗杆和蜗轮，实现减速旋转，从而促进曲轴和连杆机构的往复运动，驱动柱塞产生液压。
2.1.2行程调节机构由曲轴、偏心轮、调节螺母、调节螺杆、调节手轮（手柄）、刻度盘（指针）、刻度盘等组成。通过改变偏心距来实现柱塞的相对行程。
2.2液压系统
2.2.1 ALIWATER液压隔膜计量泵的液压系统由柱塞、缸体、缸盖、进出口阀、液压隔膜和三个阀（排气过载阀、限位阀、补偿阀）组成。在工作中，液压隔膜计量泵的隔膜将液压油和介质分开，因此液压隔膜计量泵具有泄漏的优点。
2.2.2 ALIWATER液压隔膜计量泵液压端柱塞由传动端曲柄连杆机构往复运动驱动。柱塞在液压腔中往复运动，使液压油的压力发生变化，使液压膜片发生挠曲位移，输送介质。液压腔中液压油的相对稳定性是通过三通阀的作用来维持的。
2.2.3过载阀：自动将液压油中的气体排放到液压腔中，保证工作平稳，避免因液压油过多或排放管路堵塞而造成超压，并自动打开负载阀，达到保护的目的。
2.2.4限位补偿装置是利用液压膜片推动限位阀的开度，并根据液压腔内的真空度随时补充油量，以保证液压腔内的液压油充满。

The structure principle of hydraulic diaphragm metering pump and the solution of pump freezing
Common faults and solutions:
1. There are impurities in the suction valve or discharge valve. If there are impurities in the suction valve, the suction valve will not be completely closed during the discharge stroke of the pump, resulting in the phenomenon of full or partial backflow of the pumping medium, resulting in no flow or insufficient flow of the pump. If there are impurities in the discharge valve, in the suction stroke of the pump, it will not be completely closed, forming the phenomenon of all or part of the discharge medium backflow, which will also cause no flow or insufficient flow of the pump. This problem can be solved by cleaning the suction and discharge valves.
2. The suction valve and discharge valve are seriously worn. If the suction valve and discharge valve wear seriously, the seal will not fail, forming the same medium reflux conditions as 1. If that happens. It can timely replace the relevant wear parts of suction valve and discharge valve of alwater hydraulic diaphragm pump, and realize the normal operation of ALIWATER hydraulic diaphragm metering pump.
3. The suction valve and the discharge valve are installed in reverse. If the suction valve and discharge valve are installed reversely, there will be no flow phenomenon. Therefore, after cleaning the suction valve and discharge valve, they must be installed according to the original installation sequence of the pump.
What if the pump freezes?
Generally speaking, you can use a hot towel to compress. If the temperature outside the metering pump is very low, warm water can be used to pour water, but boiling water cannot be used (because boiling water will increase the difference between cold and heat, which is easy to crack the pump body).
Structure principle of hydraulic diaphragm metering pump:
The hydraulic diaphragm metering pump is composed of motor driving mechanism and hydraulic system.
2.1 transmission mechanism
2.1.1 the power of the motor is transmitted to the worm and worm gear to realize the deceleration rotation, so as to promote the reciprocating motion of the crankshaft and connecting rod mechanism and drive the plunger to generate hydraulic pressure.
2.1.2 the stroke adjusting mechanism is composed of crankshaft, eccentric wheel, adjusting nut, adjusting screw, adjusting hand wheel (handle), dial (pointer), dial, etc. The relative stroke of the plunger is realized by changing the eccentricity.
2.2 hydraulic system
2.2.1 the hydraulic system of ALIWATER hydraulic diaphragm metering pump is composed of plunger, cylinder block, cylinder head, inlet and outlet valves, hydraulic diaphragm and three valves (exhaust overload valve, limit valve and compensation valve). In work, the diaphragm of the hydraulic diaphragm metering pump separates the hydraulic oil from the medium, so the hydraulic diaphragm metering pump has the advantage of leakage.
2.2.2 the plunger at the hydraulic end of the ALIWATER hydraulic diaphragm metering pump is driven by the reciprocating motion of the crank connecting rod mechanism at the transmission end. The plunger moves back and forth in the hydraulic cavity, which changes the pressure of the hydraulic oil and flexes the hydraulic diaphragm to transport the medium. The relative stability of the hydraulic oil in the hydraulic chamber is maintained by the function of the three-way valve.
2.2.3 overload valve: automatically discharge the gas in the hydraulic oil into the hydraulic cavity to ensure smooth operation, avoid overpressure caused by too much hydraulic oil or blockage of discharge pipeline, and automatically open the load valve to achieve the purpose of protection.
2.2.4 the limit compensation device uses the hydraulic diaphragm to push the opening of the limit valve, and replenishes the oil at any time according to the vacuum degree in the hydraulic cavity, so as to ensure that the hydraulic oil in the hydraulic cavity is full.