Any pump to be repaired, a repaired pump or a new pump shall be subjected to test sampling to check whether there are faults, the form and location of the fault performance, the ultimate vacuum degree that can be reached, and the elapsed time. Identification of the pumping rate.
The specific methods and steps of test sampling are as follows:
1. Clean all parts of the pump and remove oil and dirt. Remove the belt and use the reverse switch to test the motor forward and backward to make it turn in the direction of the arrow marked with the pump wheel. If the pump wheel is unmarked, use the palm to press the inlet of the pump and the other hand to move the pulley. If the suction is felt, the direction of rotation of the pulley is the correct direction. Then put on the belt. Before opening the pump, access the test device at the pump air inlet. One end of a vacuum hose is usually inserted into a thermocouple tube and one end is inserted into the inlet of the pump to be tested. Prior to this, a small amount of castor oil should be applied to the rubber hose to make it lubricated and easy to insert and remove. The iron pipe is clamped with iron clips (if metal pipes are used, the flange is connected to the pump port, and the other end is to be sealed with metal glass or used to regulate the joints. There should be a gas release valve in the middle of the pipe) . First move the pulley several times by hand. If there is no big obstacle, you can start the motor intermittently. Allow the pump to operate normally.
2. Check the operation of the pump: listen to the sound of the pump noise, abnormal sound; see how the gas valve flap beat? Oil is up to the oil standard center, whether there is oil leakage, leakage, leakage; check the appearance of the pump cavity with or without deformation Wait for one by one.
3. Use a high-frequency spark leak detector and a thermocouple vacuum gauge to check the change in vacuum level. Sparks are placed on the neck of the regulator (not on the regulator). Glow color can be used to determine the degree of vacuum. Normally, the color of the glow after the pump is turned on should be gradually changed from deep purple and rose to light blue until The glow is very slight, and only the fluorescence of the glass is seen. At this time, the degree of vacuum is already higher. After the glow turns light blue, you can use a thermocouple vacuum gauge to monitor the vacuum. It can also be measured with a thermocouple vacuum gauge alone. However, do not perform the two at the same time so as not to damage the thermocouple regulator. If you use a spark leak detector to move back and forth on the glass tube during the inspection, no glow can be generated and the spark can be drilled into the glass tube to form a line, indicating that the vacuum is extremely low (close to atmospheric pressure). If it is always purple, the vacuum level of the pump is not high. Check all parts of the pump carefully to see if leaks occur at rubber joints. If there is a certain indication when the thermocouple regulator measures vacuum, clamp the iron clip or stop the pump for a short time to record the pressure change curve over time to determine if the pump is not good or leaking. It is necessary to carefully distinguish the different conditions of the three curves of air leakage, air release, and pump damage, and make careful judgments.
In the use of thermocouple vacuum timing, pay attention to its test characteristics, and the vacuum degree it measures is the total pressure of the gas including water and oil vapor. The reading is related to the type of gas. For the vacuum pump identification, it is specified that the partial pressure of the permanent gas is measured by a compression vacuum gauge, and the measured value is independent of the gas type. Therefore, during the test sampling, determine whether the pump vacuum is “low†and compare it with the pump raw data. Before the pump is used in the vacuum system, it should also measure the ultimate vacuum it can reach during the test. For example, using a thermocouple vacuum gauge to measure 2 x 10-2 Torr (65 grids) (1 Torr = 133 Pa), using a compressed vacuum gauge may be 5 x 10-4 Torr, just with the indicator on the pump plate Consistently, when the pump is repaired, if the vacuum degree measured by the thermocouple vacuum gauge is less than 2×10-2 Torr, for example, only 40 cells or less ((4×10-2 Torr), the vacuum degree of the pump may be considered If it is low, it should be properly repaired and tested.If the pump does not record the original data, it can be roughly considered that it should be repaired under 50. Naturally, whether the vacuum pump needs to be repaired depends mainly on the actual needs and possible conditions of production.
The specific methods and steps of test sampling are as follows:
1. Clean all parts of the pump and remove oil and dirt. Remove the belt and use the reverse switch to test the motor forward and backward to make it turn in the direction of the arrow marked with the pump wheel. If the pump wheel is unmarked, use the palm to press the inlet of the pump and the other hand to move the pulley. If the suction is felt, the direction of rotation of the pulley is the correct direction. Then put on the belt. Before opening the pump, access the test device at the pump air inlet. One end of a vacuum hose is usually inserted into a thermocouple tube and one end is inserted into the inlet of the pump to be tested. Prior to this, a small amount of castor oil should be applied to the rubber hose to make it lubricated and easy to insert and remove. The iron pipe is clamped with iron clips (if metal pipes are used, the flange is connected to the pump port, and the other end is to be sealed with metal glass or used to regulate the joints. There should be a gas release valve in the middle of the pipe) . First move the pulley several times by hand. If there is no big obstacle, you can start the motor intermittently. Allow the pump to operate normally.
2. Check the operation of the pump: listen to the sound of the pump noise, abnormal sound; see how the gas valve flap beat? Oil is up to the oil standard center, whether there is oil leakage, leakage, leakage; check the appearance of the pump cavity with or without deformation Wait for one by one.
3. Use a high-frequency spark leak detector and a thermocouple vacuum gauge to check the change in vacuum level. Sparks are placed on the neck of the regulator (not on the regulator). Glow color can be used to determine the degree of vacuum. Normally, the color of the glow after the pump is turned on should be gradually changed from deep purple and rose to light blue until The glow is very slight, and only the fluorescence of the glass is seen. At this time, the degree of vacuum is already higher. After the glow turns light blue, you can use a thermocouple vacuum gauge to monitor the vacuum. It can also be measured with a thermocouple vacuum gauge alone. However, do not perform the two at the same time so as not to damage the thermocouple regulator. If you use a spark leak detector to move back and forth on the glass tube during the inspection, no glow can be generated and the spark can be drilled into the glass tube to form a line, indicating that the vacuum is extremely low (close to atmospheric pressure). If it is always purple, the vacuum level of the pump is not high. Check all parts of the pump carefully to see if leaks occur at rubber joints. If there is a certain indication when the thermocouple regulator measures vacuum, clamp the iron clip or stop the pump for a short time to record the pressure change curve over time to determine if the pump is not good or leaking. It is necessary to carefully distinguish the different conditions of the three curves of air leakage, air release, and pump damage, and make careful judgments.
In the use of thermocouple vacuum timing, pay attention to its test characteristics, and the vacuum degree it measures is the total pressure of the gas including water and oil vapor. The reading is related to the type of gas. For the vacuum pump identification, it is specified that the partial pressure of the permanent gas is measured by a compression vacuum gauge, and the measured value is independent of the gas type. Therefore, during the test sampling, determine whether the pump vacuum is “low†and compare it with the pump raw data. Before the pump is used in the vacuum system, it should also measure the ultimate vacuum it can reach during the test. For example, using a thermocouple vacuum gauge to measure 2 x 10-2 Torr (65 grids) (1 Torr = 133 Pa), using a compressed vacuum gauge may be 5 x 10-4 Torr, just with the indicator on the pump plate Consistently, when the pump is repaired, if the vacuum degree measured by the thermocouple vacuum gauge is less than 2×10-2 Torr, for example, only 40 cells or less ((4×10-2 Torr), the vacuum degree of the pump may be considered If it is low, it should be properly repaired and tested.If the pump does not record the original data, it can be roughly considered that it should be repaired under 50. Naturally, whether the vacuum pump needs to be repaired depends mainly on the actual needs and possible conditions of production.
Sebacic Acid For Food Flavors,Chemicals Sebacic Acid,Sebacic Acid Industrial Grade,Synthetic Resin Sebacic Acid
HENGSHUI JINGHUA CHEMICAL CO., LTD. , https://www.jinghhuachem.com