High-pressure cleaning machines are a new type of high-pressure cleaning equipment that has developed in recent years. They are widely used and cover most industrial cleaning fields. Especially in an environment where environmental protection requirements are becoming increasingly stringent, high-pressure cleaning machines such as zero-emission environmentally friendly cleaning equipment are receiving increasing attention from major companies. However, there has always been a question that puzzles everyone. What is the cleaning efficiency of high-pressure cleaning machines?  
The cleaning efficiency of a high-pressure cleaning machine is not only related to the density and speed of the high-pressure water jet, but also to the nominal distance between the jet and the object. This is because the speed and structure of the high-pressure water jet change with the jetting distance, and therefore the force applied to the object also varies with the target distance.
The actual impact of high-pressure water jets on objects not only depends on the basic parameters of the jet, but also on the distance between the nominal position of the nozzle and the target distance. The distance of the high-pressure water jet, also known as the target distance, refers to the distance from the nozzle to the cleaning target, and its size has a significant impact on cleaning quality. As the spray distance increases, the diffusion level of the high-pressure water jet increases to the nominal value of cleaning, which means that the loss of spray power increases. When the spray distance decreases, the descaling area per unit time also decreases. Therefore, if the high-pressure cleaner is too large or too small, cleaning efficiency will decrease.
The significant impact of high-pressure water jets on cleaning objects is due to the impact force caused by the kinetic energy carried by the high-pressure water jet. The farther away from the nozzle, the less kinetic energy the jet possesses. However, through provisional experiments, it has been confirmed that when using a direct nozzle for cleaning, the cleaning effect is better at a distance from the nozzle. Under normal circumstances, we believe that the cleaning effect depends primarily on the impact of the water jet and secondarily on the gas present in the water. When the pressure in the nozzle drops sharply, the gas in the water will generate cavitation bubbles, and external gas is also entrained during the spraying process. When the jet impacts the cleaning object, the pressure changes abruptly, and the gas or steam bubbles caused by the jet suddenly collapse. Cavitation caused by microjets can enhance the cleaning effect of the water jet. Therefore, the pressure of the nozzle should be determined based on the nozzle aperture and the desired spraying range to achieve good cleaning effects.
The factors that affect the cleaning efficiency of high-pressure water cleaning machines include the full utilization of pressure and flow, the conversion of pressure energy into velocity energy, the design of nozzles, and the exertion of target impact force. Therefore, when purchasing a high-pressure cleaning machine, individuals should not only consider the pressure of the machine, but also take into account various factors to choose the appropriate high-pressure cleaning equipment.