Vacuum pumps are used to determine the properties of materials

Determine the properties of the material

Metrology specialists use vacuum solutions in many of their processes. To learn more about the app industry, click here.

For many manufacturing processes and end products, it is important to know exactly the properties of the materials used. For example, in the chemical, engineering, food, pharmaceutical, geological, and materials research industries, there is a need to know precisely the properties of the materials used in the manufacturing process. Properties of the material include density, particle size distribution, porosity, pore size distribution, and surface area or catalyst reactivity. In order to analyze these and many other characteristics, reliable and highly accurate instrumentation is required. Vacuum is one of the basic functional requirements of these instruments. It is used in sample preparation and sample extraction during analysis.

The following for you to introduce the characteristics of the determination of materials with the vacuum pump, for you to solve the vacuum pump knowledge, I hope to help you. If you want to know more about vacuum pump, please contact us.

How to test vacuum pump?

Any pump to be repaired, repaired pump or a new pump should be tested to check whether the vacuum pump fault, fault performance form and position, can reach the limit of vacuum degree and experience of time, if possible, but also for the pumping rate identification.

The specific methods and steps of vacuum pump sampling test are as follows:

1. Clean all parts of the pump to remove oil and dirt. Remove the belt and test the positive and negative rotation of the motor with invert switch to make the steering consistent with the arrow direction marked by the pump wheel. If there is no mark on the pump wheel, you can press the pump inlet with your palm and move the pulley with your other hand. When you feel the suction inside the pulley, the rotation direction of the pulley is the correct direction and the mark is made. Then attach the belt. Connect the test device at the pump inlet before starting the pump. Usually a vacuum rubber tube is inserted with one end into a thermocouple gauge and the other end into the pump inlet to be tested. Prior to this, a little castor oil should be applied to the rubber nozzle to lubricate it for easy insertion and removal. Iron clamps are clamped on the rubber pipe (if metal pipes are connected, flanges shall be connected to the pump mouth, and the other end shall be sealed with metal glass and connected to the regulator or to the regulator, and there shall be an air release valve in the middle of the pipeline). Start the pulley by hand for several turns. If there is no big obstacle, the motor can be started intermittently. Make the pump run properly.

2, check the operation of the pump: listen to the pump noise, abnormal sound; How do you see the valve flap? Whether the oil reaches the oil standard center, whether there is oil leakage, gas leakage, water leakage; Check the appearance of pump cavity deformation, etc., and record one by one.

3. Check the change of vacuum degree with high frequency spark leak detector and thermocouple vacuum gauge. When the spark is hit on the gauge neck (not on the gauge), the vacuum condition can be determined by the glow color; When normal, the pump should be opened glow color from deep purple, rose red gradually into light blue, until the glow extremely small, only the fluorescence of the glass, at this time, the vacuum has been higher. After the glow turns light blue, the vacuum can be monitored using a thermocouple vacuum gauge. It can also be initially measured with a thermocouple vacuum gauge alone. But do not do both at the same time, so as not to damage the thermocouple gauge. If the spark detector is not glowing when moving back and forth on the glass tube during inspection, and the spark can drill into the glass tube and form a line, the vacuum degree is very low (close to atmospheric pressure). If always purple, the vacuum of the pump is not high, should carefully check the various parts of the pump, to see whether rubber pipe joints and other places leak. If the thermocouple gauge has a certain indication of vacuum, then you can clamp the iron clamp or suddenly stop the pump for a short time to record the pressure curve with time, to determine whether the pump is bad or caused by leakage. To distinguish carefully leakage, bleed, pump damage three different curve of the different circumstances, make a careful judgment.

When using thermocouple vacuum time, pay attention to the test characteristics of it, it is the vacuum degree measuring, including water, oil vapor, gas pressure, all readings associated with gas species. When the vacuum pump is identified, it is required to measure the partial pressure of the permanent gas with a compressed vacuum gauge, which has nothing to do with the type of gas. Therefore, in the test sampling, to determine whether the pump vacuum is “low”, should be compared with the original data of the pump. Before the pump is connected to the vacuum system, the ultimate vacuum degree that can be achieved should also be measured during the sampling test. Good Cade vacuum technology for example, measured by a thermocouple vacuum gauge is 2×10-2 ((65 grid)(1 pallet =133Pa), measured by a compression type vacuum gauge may be 5×10-4, just the same as the indicators on the pump label. When maintaining the pump, if the vacuum degree measured by the thermocouple vacuum gauge is less than 2×10-2 trays, such as only 40 grids ((4×10-2 trays), it can be considered that the vacuum degree of the pump is low, and it should be properly repaired and adjusted. If the pump did not record the original data, it can be roughly considered that less than 50 grid should be repaired. Naturally, whether vacuum pump needs repair mainly depends on the actual production needs and possible conditions.