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.

活塞泵是通過一個固定的密封件，一根活塞前后運動。活塞泵靠活塞往復運動，使得泵腔工作容積周期變化，實現吸入和排出液體。而柱塞泵的密封件安裝在柱塞上，通過一個光滑的缸壁。它主要是利用柱塞在泵缸體內往復運動，使柱塞與泵壁間形成容積改變，反復吸入和排出液體并增高其壓力的泵。柱塞泵一般有更好的初期使用特性，其優點是具有額定壓力高、結構緊湊、效率高和流量調節方便等，但它的的缺點是不能運行過高的壓力，使用壽命也較短。

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.

泵的水容量取決于泵的運行速度，泵一定要使同量的水進入并出來。活塞泵的水流量參數是穩定的，就是不管設備不同的壓力下噴射出去的水流量是不變的，因此，如果噴嘴或高壓管處出現堵塞，會導致高壓泵承壓過大。因此，設備系統內裝有卸壓閥之類的裝置。

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.

高壓清洗機更容易發生故障原因通常不是因為泵，泵故障一般是由構件或部件的磨損，如噴嘴密封件磨損引起的。一般來說泵內進水量不足，是引起泵早期使用階段發生故障的主要的原因之一，一般來說都是因為進水管管徑太小或是供水不足，從而導致沒有足夠的水進入泵內部，使得泵內造成空化現象，空化使得混合于水中的氣體發生小的爆炸產生超壓損壞，使得活塞表面磨損。

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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