The core component of the high-pressure water jet equipment is the high-pressure pump. Its main function is to turn the quantitative water into the high-pressure water flow, making the water flow have a strong impact. Among them, there are various types of high-pressure pumps, such as high-pressure plunger pump, high-pressure reciprocating pump, high-pressure electric pressure test pump and so on. Piston pump is the most common high-pressure pump used in high-pressure ultrasonic cleaning machine. The main reason is that the piston pump has high operation efficiency and longer service life. The piston of high-pressure pump is generally made of ceramic, which is not easy to be worn, so it has a long service life.

活塞泵是通过一个固定的密封件，一根活塞前后运动。活塞泵靠活塞往复运动，使得泵腔工作容积周期变化，实现吸入和排出液体。而柱塞泵的密封件安装在柱塞上，通过一个光滑的缸壁。它主要是利用柱塞在泵缸体内往复运动，使柱塞与泵壁间形成容积改变，反复吸入和排出液体并增高其压力的泵。柱塞泵一般有更好的初期使用特性，其优点是具有额定压力高、结构紧凑、效率高和流量调节方便等，但它的的缺点是不能运行过高的压力，使用寿命也较短。

Piston pump is through a fixed seal, a piston moves back and forth. Piston pump relies on the reciprocating motion of the piston to make the working volume of the pump chamber change periodically, so as to realize the suction and discharge of liquid. The seal of the plunger pump is installed on the plunger and passes through a smooth cylinder wall. It is mainly a pump that uses the plunger to move back and forth in the pump cylinder to change the volume between the plunger and the pump wall, repeatedly inhale and discharge liquid and increase its pressure. Generally, the plunger pump has better initial use characteristics. Its advantages are high rated pressure, compact structure, high efficiency and convenient flow regulation. However, its disadvantages are that it can not operate at too high pressure and its service life is short.

泵的水容量取决于泵的运行速度，泵一定要使同量的水进入并出来。活塞泵的水流量参数是稳定的，是不管设备不同的压力下喷射出去的水流量是不变的，因此，如果喷嘴或高压管处出现堵塞，会导致高压泵承压过大。因此，设备系统内装有卸压阀之类的装置。

The water capacity of the pump depends on the running speed of the pump. The pump must make the same amount of water enter and exit. The water flow parameters of the piston pump are stable, that is, the water flow ejected under different pressures of the equipment is constant. Therefore, if the nozzle or high-pressure pipe is blocked, the pressure of the high-pressure pump will be too large. Therefore, devices such as pressure relief valves are installed in the equipment system.

高压清洗机更容易发生故障原因通常不是因为泵，泵故障一般是由构件或部件的磨损，如喷嘴密封件磨损引起的。一般来说泵内进水量不足，是引起泵早期使用阶段发生故障的主要的原因之一，一般来说都是因为进水管管径太小或是供水不足，从而导致没有足够的水进入泵内部，使得泵内造成空化现象，空化使得混合于水中的气体发生小的爆炸产生超压损坏，使得活塞表面磨损。

The reason why high-pressure cleaning machines are more prone to failure is usually not the pump. The pump failure is generally caused by the wear of components or parts, such as the wear of nozzle seals. Generally speaking, the insufficient water inflow in the pump is one of the main reasons for the failure of the pump in the early use stage. Generally speaking, it is because the inlet pipe diameter is too small or the water supply is insufficient, which leads to insufficient water entering the pump, causing cavitation in the pump. Cavitation causes small explosion of the gas mixed in the water, resulting in overpressure damage and piston surface wear.

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