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Pipeline shielded pump technology experience checks
With the continuous improvement of people's living standards, energy consumption is growing, the energy power system more and more everyone's attention, large-capacity HVAC water supply and drainage equipment has been widely used in living facilities, and recognized by the market, shielding Pipeline electric pump is also one of them. Shielded electric pump from the market has been more than 30 years of history, it is used in the north as a heating alternative to other heating equipment to play a very good effect, by the people. The advantages of shielded electric pump is obvious, it not only low noise, no leakage, stable operation, and long service life, maintenance-free. However, it brings people to enjoy the same time we have to see it there are still some drawbacks: due to shielded motor, shielding sleeve loss is large, so affect the efficiency of the motor, so there are shortcomings in energy conservation. At present, some manufacturers through long-term exploration, development, the use of scientific concepts to shield energy-saving pump technology research, the energy efficiency of the motor to do the effectiveness of stability testing, and strive to solve the loss in the shortest time, the motor efficiency is low And other issues. In addition, as human beings attach great importance to resources, environmental problems and sustainable development, a series of requirements have been put forward for such issues as energy saving and environment protection of cogeneration and central heating, and the need to shield electric pumps from Inside and outside for further scientific improvement, improve and completely solve the problem of excessive energy consumption. Shanghai Huang Can Co., Ltd. G series of pipeline shielded pump, in the design and development of innovative energy-saving aspects, and how to control product quality has the following characteristics, perhaps to give some advice to peers. 1, for the pressure components in the assembly before, must be strictly through the water (gas) pressure test, such as bearing, pump body, the base are playing 1.5MP / 3min without leakage, passed the inspection before they can continue Next process installation. Especially the base, because the base processing, not for the parts of the hydraulic test, assembly after the hydrostatic test is difficult to find problems within a short time, therefore, after long-term use of the pump, found that the seat screw holes slightly Stomata lead to micro-leakage, such as the problem, we do a hydraulic test in a single part will be found, will not flow into the next process. 2, the balance of the impeller The vibration and noise of the pump is very crucial, and some companies only static balance of the impeller, in order to improve product quality, we take a balanced correction of the impeller. Its single-sided unbalance weight tolerance must be controlled at 2 grams or less, so as to ensure that the impeller balance rotation, but also reduce the impeller due to imbalance caused by vibration, while reducing noise, reducing radial force, extending the bearing The service life. In addition, the imbalance of the impeller to heavy, we use a smooth transition of the impeller surface turning to weight removal, the purpose is to reduce the vortex, reduce hydraulic losses and improve water efficiency. 3, we not only consider the inherent quality of shielded electric pump, but also for the external structure of the pump has been improved, the original installation of electric pump at the bottom of the through-hole is circular, so cement stool holes for playing time slightly Deviations, the screw is difficult to align through-hole. This has brought inconvenience to the installation, we have improved this, with a half circle instead of circular, so there is left and right clearance, no worries to install it. 4, the electric pump medium temperature ≤ 95 ℃, the motor winding using H-class magnet wire, it can guarantee a high temperature of 220 ℃. 5, Due to low electromagnetic loss of cold-rolled silicon steel sheet, high efficiency motor and low electromagnetic noise, so we use cold-rolled silicon steel sheet for stator and rotor iron core. 6, Graphite bearing is the main part of the silent pump design, but also control the heart of the rotating part of the bearing is related to the quality and reliability of the use of pump life. The graphite bearing we choose is epoxy-impregnated M104H type, which is proved by practice. The hardness of graphite bearing is hard and wear resistance is strong. 7, we use the rotor for the correction of dynamic balance, under strict process control, we rotor unbalance weight tolerance controlled at 1.5 grams or less in order to ensure that the pump balance and reduce the amount of bearing wear and tear to extend the service life of the pump . 8, there must be a high-quality inspection team, for finishing the size of each channel, only the mouth of the dimensional tolerances and shape and position tolerance are strictly checked and controlled within the allowable tolerance to self-test, the first inspection, a The entire inspection system to test norms to ensure that the pump assembly concentricity, verticality, low noise and other installation requirements to ensure the quality of the product installation. 9, in order to prevent the corrosion of the impeller, we are chrome plated on the surface of the impeller at the back of the impeller, so that the impeller in the long run, always maintain a good working condition. 10, we have a complete set of pump performance testing equipment, pumps in the factory before the performance test for each have to test for the product will not be shipped out of factory, which is responsible for the majority of users, but also to my business reputation Be responsible for. Adopted a series of strict and scientific control and check on the process of shielded electric pump, the safety, durability and reliability of the shielded pump are fully guaranteed, and its use is further enhanced life.