Gear pumps that deliver high-viscosity fluids should deliver the most flow at lower power consumption, less leakage, and greater pressure. Resonance easily occurs when the meshing frequency is close to the natural frequency of the gear train. In the gear pump outlet pipe set up an expansion of the cavity or accumulator to absorb the pump pressure pulsation or buffer pipe sudden pressure change is an effective means to control high viscosity gear pump noise. For infrequent work gear pump, the working pressure can be taken as the rated pressure of the pump, taking into account the different product quality, it is best to reduce the rated pressure of 20% to 30%. For this purpose, the gear pump and the drive motor should be connected by a flexible coupling and be mounted on a unified base plate to ensure coaxiality. The base plate is mounted on the elastic support to further improve the vibration isolation effect. 1, the working pressure of the selected transmission medium is not only the energy transfer intermediary, but also lubrication, sealing and heat transfer medium. Judge the working speed of the gear pump fairly, make the gear and the axle roll away from the meshing resonance frequency, can prevent the noise from aggravating. When intended for use over a wide range of temperatures, the viscosity index of the conveying medium should be higher. High-viscosity gear pump bearings or flanges and its drive motor should be installed on a common basis, foundation, flange or bearings are required to have sufficient rigidity to reduce vibration and noise generated when the gear pump operation. 2, installation and commissioning The pump rated pressure refers to the maximum allowable pressure pump continuous work, and its working pressure is determined by the external load, the life of the pump and its working pressure is directly related. If the ambient temperature is below the freezing point, preheat the pump with heat steam beforehand and then start the gear pump. In determining the media to be transported, it should strictly follow the delineation of the product list, try to use the fluid media recommended by the manufacturer, and pay attention to consider the system operating temperature range. Gear pump rotation direction with the inlet and outlet ports. Do not use hammer hammer when installing the coupling, so as to avoid damage to gear pump gear and other parts. High liquid viscosity will increase the friction resistance, reduce the output power, extra energy, and produce high system temperature. High viscosity gear pump outlet pipe should also be set safety valve and other protective devices, so once the pump outlet channel occurs Blockage, you can open the safety valve pressure relief. Tighten the gear pump, motor ground anchor screw, the screw force should be average, reliable connection. High-viscosity gear pump suction pipe diameter should be large enough and to avoid narrow passage or sharp turn, reduce elbows, remove unnecessary valves, accessories, as far as possible to reduce the pump installation height, shorten the length of the suction pipe to reduce the pressure loss. If the first gear pump operation, or long-term idle after use, it is best to run at no-load or light load first about an hour. For the need for positive and negative high viscosity gear pump, the import and export pipelines are required to set the safety valve. Before starting the operation, fill the housing of the gear pump with liquid to be transported for safe start-up. If during the run-in phase antecedent abnormal temperature rise, leakage, vibration and noise, should stop checking. In addition, the media to be transported must be compatible with the rubber, such as seals, gaskets and hoses in the system. If the two are incompatible, the media must be re-defined. Many oils contain waxy ingredients, which are easily crystallized at low temperatures and have a pour point below the expected minimum homework temperature. When rolling the coupling by hand, you should feel that the gear pump can roll easily, without jamming and other anomalies, before piping. Petrochemical equipment is often 24 hours continuous operation, when the pump working pressure should be made much lower than the rated pressure, and working speed should be lower than the rated speed. For the gear pump that often works under higher pressure, the working pressure should be 1 ~ 2 pressure lower than the rated pressure of the pump. 3, noise problems High viscosity gear pump outlet pipe should also be set safety valves and other protective devices, so once the pump outlet channel blockage, you can open the safety valve pressure relief. For the need for positive and negative high viscosity gear pump, the import and export pipelines are required to set the safety valve. Electric motor and gear pump shall be connected with flexible coupling, concentricity less than 0.1 mm, the inclination angle shall not be greater than 1 degree. When the viscosity of the conveying liquid is high, or when the system is working in a cold environment, it must be ensured that the conveying medium can move smoothly. If high viscosity gear pump working pressure is adjusted too high, it will make the gear pump in overload operation. If the pulley, sprocket and other drive support bracket should be set to prevent the driving gear bearing radial force. Vibration isolation can be used to prevent transmission of vibrations to adjacent structures. In fluid delivery systems, rapid changes in liquid flow velocity, flow and pressure, rupture of bubbles, and alternating loads are common causes of noise. Gear pumps that deliver high viscosity liquids are the main source of system noise. Pipe joints and other components of the seal should be good to prevent air intrusion, thereby controlling the occurrence of cavitation and cavitation.
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