CNC高压清洗机压力的变化会影响系统的其它参数，而适当地调整相应的压力参数，能够降低沿程压力损失，以获得更好的打击力。根据公式N=16.7PQ/1000可以得知，CNC高压清洗机的能量损失与压力成正比。所以CNC高压清洗机的压力损失主要可以按三方面来研究，它们分别是CNC高压清洗机车上段压力损失、高压胶管段压力损失及喷嘴压力损失。

　　The change in pressure of CNC high-pressure cleaning machine will affect other parameters of the system, and adjusting the corresponding pressure parameters appropriately can reduce the pressure loss along the way and obtain better impact force. According to the formula N=16.7PQ/1000, it can be concluded that the energy loss of a CNC high-pressure cleaning machine is proportional to the pressure. So the pressure loss of CNC high-pressure cleaning machines can be mainly studied in three aspects, namely the pressure loss of the upper section of the CNC high-pressure cleaning locomotive, the pressure loss of the high-pressure hose section, and the nozzle pressure loss.

　　CNC高压清洗机车上段的压力损失

　　Pressure loss in the upper section of CNC high-pressure cleaning locomotive

　　在CNC高压清洗机上，由于有一段从高压泵出口到卷筒出口的高压水管, 所以称为CNC高压清洗机车上段压力损失。这段高压胶管有4~5个接头和弯头，高压水急剧转弯较多，所以损失通常达到清洗系统总损失的5%，大约有15~20bar。虽然损失压力不大，但我们在计算CNC高压清洗机压力损失时，应将CNC高压清洗机车上段的压力损失考虑在内。

　　On the CNC high-pressure cleaning machine, there is a section of high-pressure water pipe from the outlet of the high-pressure pump to the outlet of the drum, which is called the pressure loss in the upper section of the CNC high-pressure cleaning locomotive. This section of high-pressure hose has 4-5 joints and bends, and the high-pressure water has a lot of sharp turns, so the loss usually reaches 5% of the total loss of the cleaning system, which is about 15-20 bar. Although the pressure loss is not significant, we should take into account the pressure loss in the upper section of the CNC high-pressure cleaning locomotive when calculating the pressure loss of the CNC high-pressure cleaning machine.

　　CNC高压清洗机喷嘴压力损失

　　CNC high-pressure cleaning machine nozzle pressure loss

　　CNC高压清洗机的直接清洗工具是喷射枪具，其中首当其冲的就是喷嘴，因为高压水射流是由喷嘴产生的。它是将高压泵的压力能转变成速度能的唯一工具。

　　The direct cleaning tool of CNC high-pressure cleaning machine is the spray gun, among which the nozzle is the first and foremost, because high-pressure water jet is generated by the nozzle. It is the only tool that converts the pressure energy of a high-pressure pump into velocity energy.

　　喷嘴压力损失主要是高压水在喷嘴中局部压力集中及动压突然变化引起的。高压水在喷嘴入口处的压力损失；喷嘴中流道断面较大变化造成的压力损失；喷嘴中水流方向突然改变造成的压力损失；单股水流变成多股水流形成分支造成的压力损失；高压水流出喷嘴形成高压水射流造成的出口压力损失。

　　The nozzle pressure loss is mainly caused by local pressure concentration and sudden changes in dynamic pressure of high-pressure water in the nozzle. The pressure loss of high-pressure water at the nozzle inlet; Pressure loss caused by significant changes in the cross-sectional area of the flow channel in the nozzle; The pressure loss caused by a sudden change in the direction of water flow in the nozzle; The pressure loss caused by the branching of a single stream of water into multiple streams of water; The outlet pressure loss caused by the high-pressure water flowing out of the nozzle to form a high-pressure water jet.

　　高压水在喷嘴中流动造成的压力损失是非常大的，如果喷嘴的形状及内孔结构设计的不好，最大压力损失可占CNC高压清洗机总压力损失的60%。喷嘴段压力损失是占CNC高压清洗机总压力损失比例中最大的，而减少喷嘴压力损失，只有通过喷嘴内部结构的正确设计和精确制作才能达到目的。

　　The pressure loss caused by the flow of high-pressure water in the nozzle is very large. If the shape and inner hole structure of the nozzle are not designed properly, the maximum pressure loss can account for 60% of the total pressure loss of the CNC high-pressure cleaning machine. The pressure loss in the nozzle section accounts for the largest proportion of the total pressure loss in CNC high-pressure cleaning machines, and reducing nozzle pressure loss can only be achieved through the correct design and precise manufacturing of the internal structure of the nozzle.

　　CNC高压清洗机高压胶管段压力损失

　　Pressure loss in the high-pressure hose section of CNC high-pressure cleaning machine

　　高压胶管段是从卷筒出口到喷枪入口很长一段的胶管。这段管路压力损失约占CNC高压清洗机总压力损失的50%以上，甚至可以达到2/3左右。这段管路压力损失可以用两种方法得出，一种是通过计算，而另一种是通过实验。计算时，应将流动的高压水作为紊流状态来考虑，因紊流符合实际情况。

　　The high-pressure hose section is a long section of hose from the outlet of the drum to the inlet of the spray gun. The pressure loss in this section of the pipeline accounts for more than 50% of the total pressure loss of the CNC high-pressure cleaning machine, and can even reach about 2/3. The pressure loss of this pipeline can be obtained in two ways, one is through calculation, and the other is through experimentation. When calculating, the flowing high-pressure water should be considered as a turbulent state, as turbulent flow conforms to the actual situation.

　　在计算高压胶管段压力损失时，还应将高压胶管在卷筒上的缠绕损失考虑在内。缠绕曲率半径越小，圈数越多，压力损失越大。在实际应用中，如果高压胶管选择或处理不当，将会导致CNC高压清洗机清洗效果大大降低，甚至不能达到当时购买的初衷。

　　When calculating the pressure loss of the high-pressure hose section, the winding loss of the high-pressure hose on the drum should also be taken into account. The smaller the curvature radius of the winding, the more turns it has, and the greater the pressure loss. In practical applications, improper selection or handling of high-pressure rubber hoses can greatly reduce the cleaning effect of CNC high-pressure cleaning machines, and even fail to achieve the original intention of purchase at that time.

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