The diaphragm compressor is an important gas compression equipment, widely used in industries such as chemical engineering, petroleum, and pharmaceuticals. However, during actual operation, a high vibration value of the diaphragm compressor is a common problem, which not only affects the normal operation of the equipment but also may lead to equipment damage and production accidents. Therefore, analyzing the reasons for the high vibration value of the diaphragm compressor and proposing corresponding solutions are of great significance for ensuring the safe operation of the equipment and improving production efficiency.

I. Analysis of the Reasons for the High Vibration Value of the Diaphragm Compressor 

1. Mechanical aspects 

1) Installation issues 

Loose or improperly tightened anchor bolts: The anchor bolts are the foundation components that fix the compressor. If they are loose or not tightened properly, it will cause the compressor to vibrate during operation. 

The levelness of the fuselage does not meet the requirements: The levelness of the fuselage not meeting the requirements will cause the connections between the moving parts to be unstable, thereby leading to vibrations. 

Coupling installation deviation: If the radial and axial deviations of the coupling exceed the allowable values, it will cause abnormal mechanical connection between the motor and the compressor, thereby resulting in vibration. 

Improper installation of pipes: If the curvature of pipe bends is too small, the pipe clamps are too loose or broken, it will cause pipe vibration, which in turn will affect the vibration of the compressor. 

2) Component wear or loosening 

Valve pressure cylinder deformation: The valve pressure cylinder undergoes deformation due to stress, which will affect the normal operation of the valve and subsequently cause vibration. 

The piston's tightening nut is loose: If the tightening nut of the piston becomes loose, knocking and vibration will occur. 

Loose and broken middle body fastening bolts: If the middle body fastening bolts become loose or break, it will cause the cylinder head bolts to loosen, and the lower part of the middle body to weld open, thereby resulting in vibration. 

3) Rotor imbalance 

Rotor imbalance: The formation of rotor scars leads to a large amount of uneven detachment, which will cause the rotor to exhibit periodic step-like imbalance during high-speed rotation, thereby resulting in excessively high vibration values. 

Rotor bending: There is intermittent local contact between the rotor and the stator, which causes uneven heating of the rotor and results in temporary thermal deformation; or due to collisions or improper placement, the rotor undergoes permanent deformation. 

Inherent imbalance: Although each rotor has undergone dynamic balance treatment before assembly, during the connection process between the rotors, imbalance may still occur. 

2. In the field of fluid mechanics 

1) Air flow pulsation: Air flow pulsation generates excitation forces, causing pipeline vibration, which in turn affects the vibration of the compressor. 

2) Insufficient cylinder clearance: If the cylinder clearance is too small, the piston will collide with the inner end face of the cylinder at the top and bottom dead points, resulting in severe impacts and vibrations. 

II. Solutions for the Abnormally High Vibration Value of Diaphragm Compressor 

1. Mechanical aspects 

1) Installation and Adjustment 

Tighten the anchor bolts: Inspect and tighten the anchor bolts to ensure they are evenly tightened. 

Adjust the levelness of the aircraft body: Recheck the levelness of the aircraft body. If necessary, make adjustments again to ensure the aircraft body is level. 

Calibrate the coupling: Recheck the installation deviation of the coupling, and recalibrate the coaxiality of the coupling. 

Optimize pipeline installation: Avoid having too small bends when installing the pipes. Tighten the pipe clamps. Try to suspend the support or vibration sections on the elastic suspension seats, and add wooden or rubber pads between the vibrating sections of the pipes and the supports. 

2) Component Maintenance 

Replace the deformed components: Replace the deformed valve pressure cylinder. 

Fasten the piston nut: Check and tighten the compression nut of the piston. 

Check the fastening bolts: Inspect the main body fastening bolts. If they are loose or broken, replace them immediately. 

3) Rotor Balance 

Repair the rotor: In case of rotor fracture, remove the rotor for welding repair, fine processing, grinding, and then perform high-speed dynamic balancing. 

Correcting rotor bending: For temporary bending, the running parameters can be adjusted to prevent the rotor from contacting the stator; for permanent bending, the rotor needs to be replaced. 

Adjust the rotor connection: For inherent imbalance, the connection between the rotors needs to be re-adjusted to ensure balance. 

2. In the field of fluid mechanics 

1) Optimize airflow pulsation: By establishing an analysis model for airflow pulsation and vibration modes, analyze the pulsation excitation force within the pipeline and the structural modes of the pipeline, optimize the pipeline design, and reduce the vibration caused by airflow pulsation. 

2) Adjusting cylinder clearance: Check and adjust the cylinder clearance to ensure it meets the design specifications. 

III. Summary 

The main operating condition of the diaphragm compressor is the process of a pressure reduction to pressure increase reciprocating cycle. After the tube bundle vehicle is fully filled and the heavy vehicle is switched to the empty vehicle, the secondary exhaust, due to its direct connection with the tube bundle vehicle, will have its pressure drop to be almost the same as the pressure inside the tube bundle vehicle tank. At this time, the pressure of the primary exhaust is higher than that inside the tube bundle vehicle tank, and the secondary cylinder does not need to do work; instead, it further increases the working load of the primary cylinder. At this point, the equipment is no longer in a symmetrical and balanced operating condition, thereby causing an increase in the vibration value of the primary cylinder. Equipment managers can consider addressing the problem of excessive vibration from this point.