YCB stainless steel arc pump body vibration source and judgment

YCB stainless steel arc pump installation and assembly vibration caused by deviation. The oil level of the pump body and the thrust tile after installation and the verticality of the oil pipe will cause vibration of the pump body. At the same time, the three control values ​​are related to each other. YCB stainless steel "target=_blank> stainless steel arc pump body vibration Source and judgment
(1) YCB stainless steel "target=_blank> stainless steel arc pump installation and assembly vibration caused by vibration. The oil level of the pump body and thrust tile after installation and the verticality of the oil pipe will cause vibration of the pump body, The three control values ​​are related to each other. After the pump body is installed, the total length of the oil pipe and pump head (excluding the filter net) is 26m, which are suspended and suspended. If the vertical deviation of the oil pipe is too large, the pump rotates. It will cause severe vibrations such as the oil pipe and the shaft. If the verticality of the oil pipe is too large, the alternating stress will be generated during the operation of the pump, causing the oil pipe to break. After the deep well pump is assembled, the oil pipe is within the total length. The verticality error should be controlled at ±2mm. The vertical and horizontal oil level error of the pump (2) the whirl of the drive shaft. The whirl, also known as “twisting”, is a kind of self-excited vibration that occurs on the rotating shaft. The characteristics of free vibration are not the type of forced vibration. It is characterized by the fact that the shaft acts as a rotary motion between the bearings. This vibration does not occur when the shaft reaches the critical speed, but occurs over a wide range and The speed of the shaft itself is more The boring of the deep well pump is mainly caused by insufficient lubrication of the bearing. If the gap between the shaft and the bearing is large, the direction of the slewing movement is opposite to the direction of rotation of the shaft. This condition is also called the vibration of the shaft. Especially the deep well pump transmission The shaft is very long, the clearance between the rubber bearing and the shaft is 0.20-0.30mm. When there is a certain gap between the shaft and the bearing, the shaft is not concentric with the bearing, the center distance is large, and there is no lubrication in the gap, such as the lubrication of the rubber pump of the deep well pump. When the oil supply pipe is broken, blocked, or mishandled, the oil supply is insufficient or not timely, etc., the vibration is more likely to occur. The arc gear of the arc gear pump is in contact with the rubber bearing at a certain moment, and the journal is subjected to the bearing. Its tangential force, the direction of action of the force is opposite to the direction of the rotational speed of the shaft, and the force is translated toward the axis. The mechanical effect is equivalent to a counterclockwise torque and a force acting on the center of the journal. Parallel to the tangential direction of the bearing wall contact point, and there is a tendency to move the journal down, so the journal will roll purely along the bearing wall, equivalent to a pair of internal gears, thus forming a rotation with the shaft The opposite rotational movement.
This has been confirmed by our daily operation, which lasts longer and can cause rubber bearings to burn out. Botou Taibang Pump & Valve Manufacturing Co., Ltd. (3) Vibration caused by overload. The pump thrust pad is made of tin-based babbitt, which allows a load of 18 MPa (180 kgf/cm2). When the pump body is started, the lubrication of the thrust pad is in the boundary lubrication state. An electric butterfly valve and a manual gate valve are respectively installed at the oil outlet of the pump body. When the pump is started and the electric butterfly valve is opened at the same time, the valve plate cannot be opened due to silt deposition or the manual gate valve is closed due to human factors, and the exhaust gas is not timely, etc., which will cause severe vibration of the pump body and quickly burn the thrust tile, such as 15 This is the ##17# pump.
(4) Outlet turbulent vibration. Dg500 short tube, check valve, electric butterfly valve, manual valve, main pipe and oil hammer eliminator are arranged in order at the pump outlet. The turbulent motion of the oil produces irregular pulsation phenomenon, and the blocking of each valve has a large local resistance. It causes the change of momentum and the change of pressure, which acts on the pipe wall and the pump body to vibrate. This can be observed by observing the pulsation phenomenon of the pressure gauge value. The pressure and velocity fields of pulsating changes in the turbulent flow are continuously transmitted to the pump body. When the main frequency of the turbulent flow is close to the natural frequency of the deep well pump system, the system absorbs energy and causes vibration. Arc gear pump to reduce the impact of this vibration, the valve should be fully open, the short tube should have a corresponding length and add a support. After this treatment, the vibration value is significantly reduced.
(5) Torsional vibration of deep well pump. The long shaft deep well pump and the motor are connected by a flexible coupling, and the total length of the transmission shaft is 24.94m. In the operation of the pump, there is a superposition of the main vibrations at different angular frequencies. The result of the two simple harmonic motions with different angular frequencies is not necessarily a simple harmonic vibration, that is, there are two degrees of freedom of torsional vibration inside the pump body, which is unavoidable. This vibration primarily affects and damages the thrust tile. Therefore, in the case of ensuring that each plane thrust tile has a corresponding oil inlet wedge, we change the 68# oil specified in the original equipment random specification to 100# oil to improve the viscosity of the thrust tile lubricant, so that the thrust tile oil The formation and maintenance of the dynamic pressure lubricating film are not destroyed.

(6) Vibration caused by mutual influence of asphalt insulation pumps mounted on the same beam. The deep well pump and motor are installed on two reinforced concrete frame beams with a cross-section of 1450mmx410mm. The concentrated mass of each pump and motor is 18t. The vibration of two adjacent pumps running on the same frame beam is another two. The vibration system of the degree of freedom, when one of the motors vibrates seriously exceeds the test run without load, that is, when the elastic coupling is not connected and the motor is idling, the amplitude of the motor of another normally operating asphalt heat pump rises to 0.15 mm. Left and right, this situation is not easy to be noticed and should be noticed.















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