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高壓清洗機(jī)車上段的壓力損失
Pressure loss in the upper section of CNC high-pressure cleaning locomotive
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高壓清洗機(jī)噴嘴壓力損失
CNC high-pressure cleaning machine nozzle pressure loss
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.
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.
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高壓清洗機(jī)高壓膠管段壓力損失
Pressure loss in the high-pressure hose section of CNC high-pressure cleaning machine
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.
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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