To understand the influence of the high pressure washer hose of ultra-high pressure cleaning machine on the cleaning effect, we should first know that the change of the pressure of the high pressure cleaning machine will affect other parameters of the system and adjust the corresponding pressure parameters appropriately, so as to reduce the pressure loss along the process and obtain the best striking force.
The high pressure washer hose is a long section of hose from the drum outlet to the nozzle inlet.
The pressure loss of this section of the pipeline accounts for more than 50% of the total pressure loss of the high pressure cleaning machine and can even reach about 2/3.
In practical application, if the high pressure washer hose is not selected properly, the cleaning effect of the high pressure cleaning machine will be greatly reduced. The washer hose is a conveyance for conveying the high pressure water produced by the high pressure pump to the high pressure spray gun. The main consideration should be several important parameters are pump pressure, flow, hose diameter, length and pipe roughness, etc. when choose high pressure washer hose.
So, how to choose the right high pressure washer hose?
- High pressure washer hose rated pressure selection
The rated pressure of the hose should be equal to or greater than the rated pressure of the high pressure pump. Only in this way can the service life of the hose reach the standard. In addition, the pressure of the pump shall not exceed the rated pressure of the hose when the high-pressure cleaning machine is in operation. If it exceeds the rated pressure, the service life of the hose will be reduced. If it exceeds 25%, the hose life will be halved. At the same time, joints and other places will be in danger of bulging.
- High pressure washer hoserated flow selection
The flow rate of high pressure water in the high pressure washer hose is determined by the inner diameter and flow rate of the hose. The flow rate of high pressure water in the pipe is generally 6-8m/s. In addition, the pressure loss increases 130% when the flow rate increases from 50L/min to 75L/min at the same hose diameter, such as 10mm. That is to say, increasing the flow rate or increasing the average velocity of high-pressure water will cause greater resistance or pressure loss when the hose diameter is constant. Therefore, when choosing to increase the flow rate to improve the cleaning efficiency of the high-pressure cleaning machine, it is necessary to weigh the negative impact caused by pressure loss at the same time.
- The choice of the inner diameter of the high-pressure washer hose
The size of the pressure loss inside the hose and the friction resistance between the outside of the hose and the bottom of the large pipe must be considered at the same time when the inner diameter of the high-pressure cleaning pipe is selected. The larger the inner diameter of the hose, the smaller the pressure loss, and the greater the final impact force of the jet. The hose and sprinkler head advance automatically at the bottom of the pipe to be cleaned by high pressure water jet reaction. The greater the hose diameter and mass, the greater the friction resistance, the nozzle from the distance will be reduced. The choice of hose inner diameter is constrained by two mutually limiting factors: from the perspective of reducing the dynamic pressure loss on the nozzle, the larger the inner diameter, the better; And if from the extension of the nozzle in the cleaning pipe self-feeding ability and length, the smaller the inner diameter, the better. In practical application, we can choose according to our own needs. Usually the flow is below 50L/min, the inner diameter of the hose is 6mm, the flow is between 60-90L/min, the inner diameter of the hose is 10mm, the flow is above 100L/min, the inner diameter of the hose is above 13mm.
- The length of the high pressure washer hose, the shorter the length of the hose, the smaller the pressure loss, the greater the effective hitting force on the nozzle.Therefore, in the actual cleaning operation, the hose length should be as short as possible only in the long distance pipe cleaning will have to use long hose.
- Inner hole surface roughnessof high pressure washer hose selection
The inner layer material of the hose is mostly rubber, nylon or polyamide, etc., and its smoothness is also improved in turn. The greater the friction coefficient of roughness is, the greater the pressure loss is. Therefore, when selecting the hose, the hose with smooth inner surface should be selected as far as possible to increase the striking force of the nozzle outlet.
Through the above points, we can see that if the high-pressure washer hose parameters are wrong, it will greatly reduce the cleaning effect. People often say that small details determine success or failure. I think it may be too extreme, but if the small details are also taken into account, it is what ordinary people say.