的清洗过程：1、空化作用”是数以百万计微小气泡（或空穴）在液体中迅速形成并爆裂的现象。“空化作用”的产生是由于高频声波（超声波）形成的高、低压力波交互作用的结果。在低压阶段，气泡一点点变大，而在高压阶段，其被压缩而内爆。2、怎样能实现最佳超声波清洗效果？有许多条件能够决定最终的清洗效果，其中最重要的是选择合适的清洗液，在正确的温度下清洗恰当的时间，选择合适尺寸和类型的超声波清洗机。3、用超声波清洗会损伤我的工件么？超声波清洗对大多数工件是安全的。每秒钟数以千计气泡的内爆产生的能量是巨大的，但由于能量集中在极其微小的区域内，因此整个清洗过程是安全的。对安全性最为谨慎的考虑应该是清洗液的选择。清洗液对某些工件表面潜在的伤害性可能会因为使用超声波而增大。超 Ultrasonic flowmeter cleaning process: 1. Cavitation is a phenomenon in which millions of tiny bubbles (or cavities) rapidly form and burst in a liquid. The occurrence of "cavitation" is due to high-frequency sound waves (ultrasonic waves) ) The result of the interaction of the high and low pressure waves. In the low pressure stage, the bubble grows a little, and in the high pressure stage, it is compressed and implosion. 2. How to achieve the best ultrasonic cleaning effect? There are many conditions that can Decide the final cleaning effect. The most important thing is to choose the right cleaning solution, the right time at the right temperature, and the right size and type of ultrasonic cleaner. 3. Will ultrasonic cleaning damage my work? Ultrasonic Cleaning is safe for most parts. The energy generated by the implosion of thousands of bubbles per second is huge, but because the energy is concentrated in an extremely small area, the entire cleaning process is safe. It is the most safe Careful consideration should be the choice of cleaning fluid. The potential damage of cleaning fluids to certain workpiece surfaces may be increased by the use of ultrasound. Wave cleaning is not recommended for the following gems: opal, pearl, emerald, tanzanite, malachite, emerald, lapis lazuli, and coral. 4. What are "direct" and "indirect" cleaning? Direct cleaning is usually It means that the workpiece is cleaned in a cleaning tank filled with cleaning liquid. The workpiece is usually installed in a perforated tray or tooling basket. The limitation of direct cleaning is that you need to choose a cleaning liquid that will not damage the ultrasonic cleaning tank. Indirect cleaning is to The workpiece to be cleaned is placed in a beaker or a tray without holes. The beaker or tray is filled with a solution instead of being directly installed in the cleaning tank. When indirect cleaning is selected, make sure that the water level in the tank is maintained at the standard position. 5. Why do you need a special cleaning solution for cleaning? The purpose of using the cleaning solution is to break the connection between the dirt and the workpiece, and the use of water alone can not achieve the cleaning effect. The main purpose of the ultrasonic cavitation is also the auxiliary cleaning solution Cleaning. A cleaning solution contains a variety of ingredients to achieve the best cleaning effect. For example, reducing the surface tension of the liquid can increase the cavitation strength, while a Ultrasonic cleaning fluid will contain wetting agent or surfactant ingredients. 6. What cleaning fluid should be used? The currently used ultrasonic cleaning fluid is a mixture containing multiple cleaning ingredients, wetting agents and other reactive ingredients. Choose the right one The cleaning fluid is essential to effectively clean the workpiece and eliminate unwanted reactions. 7. What kind of cleaning fluid should not be used? Do not use flammable or low flash point solutions. The energy released by cavitation is converted into Heat and kinetic energy generate high temperatures in the solution, which is very dangerous for flammable liquids. Acidic cleaning liquids and bleaching agents should generally be avoided because they can damage the stainless steel tank or cause harm; but when they are used for indirect cleaning In the process, it can be used when using a large-mouth beaker as an indirect cleaning container. 8. When should the cleaning fluid be changed? When cleaning, you should see a significant decrease in the cleaning fluid and should be replaced; or when the cleaning fluid is significantly dirty or When it is a failure, the cleaning fluid should also be replaced. 9. Why must I keep the cleaning fluid within the height allowed by the level indicator? The ultrasonic cleaning system is a "tuned" system. Improper liquid level will change the cleaning environment, which will affect the system frequency, reduce the cleaning efficiency and damage the equipment. Maintaining the proper level keeps the workpiece in optimal flow and protects the heater and vibration box from damage due to overheating. 10. What is the length of the cleaning time? Changes in cleaning time depend on factors such as dirt, cleaning fluid, temperature and cleanliness requirements. When the ultrasonic cleaning is started, it can be seen that the obvious dirt is removed almost at the same time. Adjusting the cleaning time is the simplest (and often misused) way to compensate for changes that occur during the process. Although experienced operators can try to ensure the time required for a new cleaning process, it is often necessary to verify this by selecting cleaning fluids and contaminating the workpiece in actual applications. 11. What is the heating device used for? The huge energy generated by cavitation generates heat. The main purpose of the heating device is to maintain the temperature in the cleaning solution during the cleaning process. 12. What is the best cleaning temperature? Heating can usually provide the speed of cleaning. At the same time, most of the chemical components in the cleaning solution will achieve the best cleaning effect at a certain temperature. The best way to find the best temperature is to experiment. Generally, the optimal cleaning temperature is between 50 ° C and 65 ° C.
在安装上的注意细节 Pay attention to the details of the installation of the ultrasonic flowmeter
(I) Learn more about the scene
The ultrasonic flowmeter should be aware of the situation before installation, including:
1. What is the distance from the host where the sensor is installed; 2. Pipe material, pipe wall thickness and pipe diameter; 3. Pipe age; 4. Fluid type, whether it contains impurities, bubbles, and whether the pipe is full; 5. Fluid temperature; 6, Whether there are interference sources at the installation site (such as frequency conversion, strong magnetic fields, etc.); 7. Four season temperature at the place where the host is placed; 8. Whether the power supply voltage used is stable; 9. Whether remote transmission signals and types are required;
(2) Selecting the installation location Selecting the installation pipe section has a great impact on the test accuracy. The selected pipe section should avoid interference and eddy current, which have a large impact on the measurement accuracy. Generally, the pipe section should meet the following conditions: 1. Avoid the pump High-power radio and frequency conversion, that is, install the machine where there is a strong magnetic field and vibration interference; 2. Choose a pipe section that is uniform and dense and easy for ultrasonic transmission; 3. Have a long enough straight pipe section, and the straight pipe section upstream of the installation point must be greater than 10D (Note: D = diameter), the downstream should be greater than 5D; 4, the upstream of the installation point should be 30D distance from the pump; 5, the fluid should fill the pipeline; 6, there should be enough space around the pipeline for the site personnel to operate, underground pipelines need Test well (3) to find the installation distance and determine the position of the probe
1. Enter the pipeline parameters into the instrument and select the probe installation method to obtain the installation distance. 2. On horizontal pipelines, generally select the middle of the pipeline to avoid the top and bottom (the top may contain air bubbles and the bottom may have sediment); 3 Installation by V method: first determine a point, and measure another point at a horizontal position according to the installation distance. Z method installation: first determine a point, measure another point at a horizontal position according to the installation distance, and then measure the symmetrical point of this point on the other side of the pipeline.
的常识 Common sense of ultrasonic flowmeter
1. When the fluid temperature is below 150 degrees, the meter can run stably for a long time; 2. The power supply voltage fluctuation range required by the flowmeter is 220VAC? 5%; or 9-24VDC 3. The temperature range that the flowmeter host can work normally is -20 ° C — + 60 ℃; 4, the distance between the instrument and the sensor is preferably within 300 meters; 5, the power consumption of the fixed instrument is 15w; 6, the accuracy of the instrument is?%, The linearity is 0.5%; 7, the instrument requires the pipeline Can be measured when the pipe diameter is 25mm to 2540mm; 8. The turbidity of the measurement fluid should be less than 10000ppm, and the bubble content is small;