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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 several times with the hand. If there is no big obstacle, the motor can be started intermittently. Keep the pump running normally.
2. Check the operation of the pump: listen to the pump sound with or without noise, abnormal sound; see how the valve mouth beats? Does the oil reach the center of the oil mark, whether there is oil leakage, air leakage or water leakage; check whether the pump cavity is deformed or not. Etc. Make a record one by one.
3. Check the vacuum degree with a high-frequency spark leak detector and a thermocouple vacuum gauge. Sparks are 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 and rose red to light blue until 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 type of gas. For the vacuum pump identification, the compression pressure gauge is used to measure the partial pressure of the permanent gas, and the measured value is independent of the gas type. Therefore, during the test, it is judged whether the pump vacuum is "low" and should be compared with the original data of the pump. Before the pump is connected to the vacuum system, it should also measure the ultimate vacuum that can be achieved during the test. For example, a thermocouple vacuum gauge is 2 x 10-2 Torr ((65 ga) (1 Torr = 133 Pa), and a compression vacuum gauge may be 5 x 10-4 Torr, just like the indicator on the pump placard. Consistent. When the pump is repaired, if the vacuum is less than 2×10-2 Torr by a thermocouple vacuum gauge, for example, only 40 grids or less ((4×10-2 Torr), the pump vacuum is considered to be biased. If it is low, it should be properly repaired and debugged. If the pump does not record the original data, it can be roughly considered that it should be repaired below 50. Naturally, whether the vacuum pump needs repair depends mainly on the actual needs and possible conditions of production.
About the test of the vacuum pump
Any pump to be repaired, a repaired pump or a new pump shall be tested and tested to see if there is any fault, the form and location of the fault, the ultimate vacuum that can be achieved, and the time elapsed. Identification of pumping rate.
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