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The development of Roots vacuum pump productivity, expand product use and performance play, through the improvement of product strength, constantly improve the product use and quality performance, so as to speed up the play of equipment application performance, continuously enhance the driving force of product performance with high-quality practical level, so as to make the use of the strength of each studio, reflect the improvement of product application ability, so as to enhance the application ability of products Fast product application and quality strength drive.

Preparation before startup

Check whether the water tank level of water flushing pump (front stage pump) reaches more than 3 / 4 of the water tank, and make up if it is insufficient. Check whether the water used in the water tank is clean. Sewage containing sediment is not allowed to be used to avoid blocking the pipeline. Roots vacuum pump increases the wear of pump impeller and increases the load of motor, resulting in failure, which affects the service life of water flushing pump. Check the lubricating oil level in the intermediate pump and the main pump, which must be more than 3 / 4 of the oil window. Check the color of the lubricating oil at the same time for the middle ring vacuum equipment. If there are more milky white or black impurities in Roots vacuum pump, the mechanic shall be informed to replace the lubricating oil. Roots vacuum pump to check whether the circulating cooling water circuit of intermediate pump and main pump is in good condition, open the inlet and outlet valves of circulating cooling water, and check whether the circulating cooling water inlet and outlet is normal. Check whether the drain valve of buffer tank at the bottom of intermediate pump is closed. Check whether the circuit of vacuum pump unit is in good condition and whether the indication of control cabinet is normal. Check whether the starting pressure of intermediate pump and main pump is normal (the starting inlet pressure of intermediate pump is above 0.065mpa, and that of main pump is above 0.085mpa). After the above items are checked and confirmed to be correct, the vacuum unit can be started.

Operation precautions

During the operation of the vacuum unit, the sound response is uniform and there is no noise, and there is no irregular abnormal vibration during the operation. Pay attention to the motor load and temperature rise of each part of the pump. Under normal conditions, the maximum temperature rise of Roots vacuum pump shall not exceed 40 ℃, and the maximum working temperature shall not exceed 80 ℃. If oil leakage is found in the work, stop the work immediately and check and repair after pressure relief. Roots vacuum pump is not allowed to continue to work or maintain under pressure after oil leakage is found. It is necessary to ensure the normal circulation of cooling water in and out. Start up of Roots vacuum pump vacuum unit: open the inlet and outlet valves of circulating cooling water of intermediate pump and main pump to ensure the normal inlet and outlet of circulating cooling water. Close the blowdown valve of the buffer tank of the water washing pump, start the water flushing pump, and slowly open the valve on the bypass pipe of the front stage water flushing pump and the inlet valve of Roots vacuum pump after the operation is normal (the noise generated by the motor and the pump is balanced). When the system pressure reaches the allowable inlet pressure set by the intermediate pump, start the intermediate pump. If the automatic control gear is used, it will be directly switched to the automatic control gear, and the start-up process of the unit will be automatic. If manual control, when the outlet pressure of intermediate pump reaches the allowable inlet pressure of main pump, start the main pump.

Stop operation of Roots vacuum pump

Put the control handle on the control cabinet of the vacuum unit into the manual gear, close the suction valve of Roots vacuum pump and isolate it from the vacuum system. Stop the pump step by step according to the order of the front stage water flushing pump of the main pump and intermediate pump. It is strictly forbidden to make mistakes in the shutdown procedure. When stopping the front stage water flushing pump, first open the blowdown valve of the buffer tank of the water flushing pump, and then shut down the pump.