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How to extend the service life of high viscosity pumps
High-viscosity pump delivery media is not only an energy transfer intermediary, but also lubrication, sealing and heat transfer medium. Gear pumps that deliver high-viscosity fluids should deliver the most flow at lower power consumption, less leakage, and greater pressure. The viscosity of the liquid reflects the ease with which the medium flows. Excessive viscosity increases internal friction, reduces output power, istes energy, and produces excessively high system temperatures. In determining the media to be transported, it should strictly follow the provisions of the product manual, try to use the manufacturer recommended fluid medium, and pay attention to consider the system operating temperature range. When you want to use in a wide range of temperature, the viscosity of the conveying medium should be higher. When transporting liquids with high viscosity or when the system is operating in a cold environment, it must be ensured that the transport medium will flow smoothly. Many oils contain waxy components that can crystallize easily at low temperatures. The pour point for the delivery medium should be below the expected minimum operating temperature. In addition, the medium 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. High-viscosity pump noise problems In fluid delivery systems, rapid changes in flow velocity, flow and pressure, burst of bubbles, and alternating loads are common causes of noise. Gear pumps that deliver high-viscosity fluids are the major contributors to system noise source. Reasonable determination of gear pump speed, gear and shaft rotation to avoid meshing resonance frequency, to prevent increased noise. Because when the meshing frequency close to the natural frequency of the gear train prone to resonance. The use of appropriate vibration isolation technology can prevent the transmission of vibration to the adjacent structure. For this purpose, the gear pump and the drive motor should be connected by a flexible coupling and be mounted on the same base plate to ensure coaxiality. The base plate is mounted on the elastic support to further improve the vibration isolation effect. 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. In general, the maximum permissible noise of a high-viscosity pump operating in open air should be less than 90 dB, otherwise the source of noise should be actively or passively curtailed while reducing the direct worker exposure to noise-intensive operating hours. If you really can not control the noise, but also to take hearing protection. High-viscosity gear pump in the course of operation once the abnormal noise, it should immediately stop checking. The selection of high-viscosity pump working pressure High-viscosity pump rated pressure refers to the maximum continuous pressure pump working pressure, and its working pressure is determined by the external load, high-viscosity pump life and its working pressure is directly related. For infrequent work of gear pumps, high-viscosity pump 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 high-viscosity pumps that frequently work at higher pressures, the operating pressure should be 1 to 2 pressure levels lower than the rated pressure of the pump. 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. If the high viscosity gear pump working pressure is adjusted too high, it will make the gear pump in overload operation. High-viscosity pump installation and commissioning High-viscosity gear pump bearing or flange and its drive motor should be installed with a common foundation, foundation, flange or bearings are required to have sufficient rigidity to reduce gear pump operation generated Vibration and noise. Motor and gear pump shall be connected with flexible coupling, concentricity less than 0.1 mm, the angle of inclination shall not be greater than 1 degree. Do not use hammer hammer when installing the coupling, so as to avoid damage to gear pump gear and other parts. If the pulley, sprocket and other drive support bracket should be set to prevent the driving gear bearing radial force. Tighten the gear pump, motor ground screw, the screw force should be uniform, reliable connection. Turn the coupling by hand, should feel the gear pump can easily rotate, there is no clamping and other anomalies, and then can be piping. 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. Pipe joints and other components of the seal should be good to prevent air intrusion, thereby controlling the occurrence of cavitation and cavitation. High viscosity pump before starting operation, to the gear pump filled with liquid to be transported within the housing, for safe start. If the ambient temperature is below the freezing point, preheat the pump with heat steam beforehand and then start the gear pump. The direction of rotation of high-viscosity pump with inlet and outlet port line. 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. If abnormal temperature rise, leakage, vibration and noise are detected in advance during running-in, the machine should be shut down for inspection. Check Valve and Safety Valve It is advisable to install a check valve on the output line of the gear pump. In this way, when repairing the pump and the output pipe, the liquid in the system will not flow backwards. Gear pump with a load of parking, but also prevent the pump reversing and produce a partial vacuum in its output pipe. It should be noted that the outlet check valve can not be installed anti-jamming phenomenon or appear. 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 relief valve relief. The safety valve can be cast in one piece with the pump body or pump head and can also be assembled separately. For the need for positive and negative high viscosity gear pump, the import and export pipelines are required to set the safety valve.