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Stainless steel gear pump vibration
Stainless steel gear pump vibration (1) stainless steel gear pump installation and assembly caused by vibration bias. After the installation of the pump body and the thrust of the level and Yang pipe vertical tolerance will cause the pump body vibration, at the same time these three control values ​​have a certain relationship. After the pump body is installed, the total length of the pumping pipe and the pump head (excluding the filter) is 26m, all of which are suspended. If the vertical deviation of the pumping pipe is too large, the pump and the shaft will cause violent vibration . Yang pipe vertical tolerance is too large will be in the pump during the operation of alternating stress, causing Yang pipe fracture. Deep well pump assembly is completed, Yang pipe in the total length of the vertical error should be controlled at ± 2mm. Pump horizontal and vertical error (2) drive shaft whirl. Whirl, also known as "rejection turn", is a self-excited vibration occurring on the rotating shaft. It has neither the characteristics of free vibration nor the type of forced vibration. It is characterized by the axis of the shaft in the bearing performance of the rotation, this vibration does not occur when the shaft reaches the critical speed, but in a larger range and the rotation speed of the shaft itself less. Deep well pump rejection mainly caused by inadequate lubrication of the bearing lubrication, if the bearing and the bearing clearance between the larger, then the direction of rotation and the rolling axis of rotation in the opposite direction, this situation, also known as shaft jitter. In particular, deep well pump shaft is very long, the rubber bearing and the shaft with the gap 0.20-0.30mm, when the shaft and the bearing there is a certain gap, the shaft and the bearing is not the heart, the larger the center distance, the lack of lubrication gap, such as deep well Pump rubber bearing lubrication Supply pipe rupture, blockage, misuse caused by inadequate or inadequate water supply, etc., more prone to shaking. In a moment of rolling journal and rubber bearings at a little contact, the journal by the bearing to its tangential force, the role of the direction of force and shaft speed in the opposite direction, the force to the axis of translation, the mechanical effect Which corresponds to a counterclockwise torque and a force acting on the journal center parallel to the tangential direction of the contact point of the bearing wall and tends to move the journal downwards so that the journal will be pure along the bearing wall Movement, commensurate with an internal gear, so as to form the axis of rotation in the opposite direction of rotation. This has been proved by our daily operation, which can last a bit longer and burn the rubber bearings. (3) Vibration caused by overload. Thrust washer pump using tin-base Babbitt alloy, which promised to load 18MPa (180kgf / cm2). Pump body at start-up, the lubrication of the thrust pad at the border of lubrication. In the pump outlet were installed electric butterfly valve and manual gate valve. In the pump to start at the same time open the electric butterfly valve, as the sediment deposition caused by the valve plate can not be opened or human-caused manual gate valve closed, exhaust is not timely, etc., will cause severe vibration of the pump body, and quickly burn the thrust tile, such as 15 #, 17 # pump is equal to such. (4) outlet turbulence vibration. Dg500 short tube, check valve, electric butterfly valve, manual valve, supervisor and water hammer eliminator are arranged at the outlet of the pump. The turbulent motion of the water produces irregular pulsation phenomena. With the blocking of each valve, the local resistance is larger, Caused by changes in momentum and pressure changes, the role of the tube wall and the pump to make it vibrate, which can observe the value of the pressure gauge pulsation to illustrate. The fluctuating pressure and velocity fields in the turbulent flow are continuously transmitted to the pump body. When the main frequency of turbulence is close to the natural frequency of the deep well pump system, the system absorbs energy and causes vibration. To reduce the impact of this vibration, the valve should be fully open, short tube should be the appropriate length and add bearings. After this treatment, the vibration value is significantly reduced. (5) Deep well pump torsional vibration. Long axis deep well pump and motor coupling flexible coupling, shaft length 24.94m. During pump operation, there is a superposition of the main vibrations at different angular frequencies. The results of the two simple harmonic vibrations with different angular frequencies are not necessarily harmonic harmonic vibrations, that is, the two-degree-of-freedom torsional vibration exists inside the pump body, which is inevitable. This vibration mainly affects and impairs the thrust pad. Therefore, to ensure that each plane has a corresponding thrust pad thrust into the oil wedge case, we will be the original equipment, a single copy of the provisions of the 68 # oil into a 100 # oil, improve the viscosity of thrust shingles, so that the thrust shingles The formation and maintenance of the hydrodynamic lubricating film are not damaged. (6) The vibrations caused by the interaction of asphalt insulation pumps installed on a single root beam. Deep well pumps and motors are installed on two reinforced concrete frame beams with a cross-section of 1450mmx410mm. Each pump and motor have a mass concentration of 18t. The operation of two adjacent pumps oscillating on a unified frame beam is again a two Degree of freedom vibration system, when one of the motor vibration seriously exceed the standard without load test run, that is, the elastic coupling is not connected and idling the motor, the other normal operation of the motor amplitude rose to about 0.15mm, this The situation is not easily noticeable and should be brought to the attention.