Any imported vacuum pump , repaired pump or a new pump should be tested and tested for faults, the form and location of the fault, the ultimate vacuum and the time it can be experienced. Identification of the pumping rate was performed.
The specific methods and steps of the test are as follows:
1. Wipe all parts of the pump to remove oil and dirt. Remove the belt and use the reverse switch to test the motor to reverse the direction so that the steering direction is the same as the direction of the arrow marked on the pump wheel. If the pump wheel is not marked, use the palm of the hand to press the pump inlet and use the other hand to move the pulley. When the suction is inward, the direction of rotation of the pulley is the correct direction. Then put on the belt. Connect the test device to the pump inlet before turning on the pump. Usually, a thermocouple tube is inserted into one end of the vacuum rubber tube, and one end is inserted into the inlet of the pump to be tested. Before this, a small amount of castor oil should be applied to the rubber hose to make it easy to plug and unplug. The iron pipe is clamped on the rubber pipe (if it is connected by a metal pipe, the flange is connected to the pump port, and the other end is sealed with a metal glass to access the pipe or the pipe joint, and the pipe should have a vent valve in the middle) . First move the pulley a few times by hand. If there is no big obstacle, the motor can be started intermittently. Keep the pump running normally.
2. Check the operation of the vacuum pump: listen to the sound of the pump sound, abnormal noise; see how the valve flap is moving? Does the oil reach the center of the oil mark, whether there is oil leakage, air leakage or water leakage; check whether the pump chamber is deformed or not. Wait. Make a record one by one.
3. Check the vacuum degree with a high-frequency spark leak detector and a thermocouple vacuum gauge. Spark is placed on the neck of the regulation tube (not on the regulation tube). The color of the glow can be used to judge the degree of vacuum. Normally, after the pump is turned on, the color of the glow should be gradually changed from dark purple to red to blue. The glow is extremely small, only the fluorescence of the glass is seen. At this time, the degree of vacuum is already high. After the glow turns light blue, you can use a thermocouple vacuum gauge to monitor the vacuum.
It can also be measured by a thermocouple vacuum gauge at the beginning. However, do not do both at the same time to avoid damage to the thermocouple. If the spark leak detector is moved back and forth on the glass tube during the inspection, no glow can be produced, and the spark can be drilled into the glass tube into a line, indicating that the vacuum is extremely low (near atmospheric pressure). If it is always purple, the vacuum of the pump is not high. You should carefully check all parts of the pump to see if there is a leak in the rubber hose joint. If the thermocouple gauge has a certain indication when measuring the degree of vacuum, the iron clip can be clamped or the pump can be stopped for a short time to record the pressure versus time curve to determine whether the pump is bad or leaking. It is necessary to carefully distinguish the different situations of the three curves of air leakage, deflation and pump damage, and make a careful judgment.
When using the thermocouple vacuum timing, pay attention to its test characteristics. The vacuum measured is the total pressure of the gas including water and oil vapor, and the reading is related to the gas type. For the identification of imported vacuum pumps , the compression pressure gauge is used to measure the partial pressure of the gas, and the measured value is independent of the gas type. If the pump does not record the original data, it can be considered that it should be repaired if it is less than 50 grids. Naturally, whether the vacuum pump needs to be repaired depends mainly on the actual needs and possible conditions of production.
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