2011-2016 China Submersible Pump Market Research Depth Report shows that the construction of the South-to-North Water Diversion Project will become one of the major driving forces in the future pump market. It is estimated that the development of China's pump industry will reach a small peak during the 12th Five-Year Plan, with an average annual growth Rate or over 20%. The research of the domestic professional fluid machinery institutions also shows that the power consumption of pumps in the world accounts for about 25% of the total consumption of industrial equipment, of which centrifugal pumps account for about 50% of all pump power consumption. In view of this, if the development of centrifugal pumps can be planned and guided from the perspective of energy-saving and high efficiency, for China, where rapid development of manufacturing industry and lack of electricity, can be regarded as a huge social and economic benefit Move. Therefore, the analysis of the existing problems of centrifugal pumps, put forward their energy-saving technology approach is an important issue for the development of the industry.
First, the main problems of energy-saving centrifugal pump (A) the design level and the concept of limitations At this stage the design of centrifugal pumps mainly follow the traditional model conversion method and the speed coefficient method, the two design methods are based on experience, Did not break through in the past design level, there is no big improvement in efficiency, coupled with centrifugal pump manufacturers too much to consider the immediate economic benefits, centrifugal pump energy conservation work has been neglected or even shelved. In addition, the centrifugal pump in the development process, had scrape a burst of "full head" wind. Design units in order to solve the site when the export valve is open all over the super-power, bearing fever, the design tends to "full head" concept, that is, the centrifugal pump in the entire working curve, the lift is not super-power, However, the actual operating point is not in the high efficiency of the design area, resulting in greater waste of resources. (B) of the energy-saving understanding of the past The concept of energy-saving centrifugal pump more on the improvement of various efficiency indicators, in fact, this is a misunderstanding of energy-saving centrifugal pump Energy efficiency is not a simple indicator, but contains the right Centrifugal pump reliability, maintainability, security, safety, environmental adaptability to improve, and the performance of centrifugal pump stability, life expectancy, improve the utilization of materials. Then specific to the use of centrifugal pump environment, but also need to be targeted for energy-saving design, such as centrifugal pump sealing performance, hydraulic performance and centrifugal pump wear, high temperature, corrosion resistance, cavitation resistance, etc., which should For different environments, the purpose of design. Therefore, energy-saving centrifugal pump research is very complex, not one-sided to understand the concept of energy saving, but to have a comprehensive understanding of the whole. (C) the selection of the irrational use of units in the purchase of centrifugal pumps, the flow and headroom often tend to be large, in order to maximize meet their own requirements, this selection is obviously unreasonable, Directly caused by the centrifugal pump in use, the actual operating efficiency is far below the maximum efficiency of the design, and even the rated operating conditions are not in the high efficiency area, can not fully and effectively use the power of driving energy such as motor or diesel engine (that is, do a lot of useless work) . (D) improper use In the course of use, due to improper use of the operation and maintenance of the unit, maintenance is not timely, so that the centrifugal pump often fails during use. Such as the use of poor media cleanness, aquatic plants and other windings or other foreign matter into the centrifugal pump impeller; Another example is the import pipeline clean, slag, iron, etc. into the runway, resulting in a sudden cardiac pump stuck, bearing Fever, seal burnout and other failures. There are some units to use, in order to adapt to the scene of the venue, the pipeline set unreasonable, the horizontal direction and the vertical distance is much greater than the design distance, bend joints and more, resulting in serious hydraulic losses of the pipeline, far from the initial design of the pipeline Device curve requirements. All of the above conditions can easily lead to a lot of energy waste. In summary, to solve the existing centrifugal pump design, manufacture, selection, use and other issues, will enable the centrifugal pump energy-saving technology in our country has made considerable development inevitable. Centrifugal pump design Energy-saving centrifugal pump design units should try to use industry-proven advanced software to design the hydraulic model, the design should not be entangled in one-sided whole head concept, but to use advanced flow field analysis and other hydraulic design methods, design A reasonable product. For example, in the localization of imported Russian products, surveying and mapping, it was discovered that the centrifugal pump manufactured in Russia more than 10 years ago, its hydraulic design has reached a very advanced level, indicating that the design concept should be forward-looking. In the design and development process, to carry out the reliability test of centrifugal pumps, the material selection test of the product, if used in humid mildew environment, but also salt spray resistant mold test to improve the efficiency of centrifugal pump products to achieve Energy-saving purposes. For different environments, the design unit to choose different materials. Such as the South China Sea has a strong corrosive water, the scope of the ship used in centrifugal pump over-current components must use nickel-aluminum bronze and other corrosion-resistant materials, and the East China Sea sediment with high water content, we must use high wear resistance High manganese bronze and other materials. In recent years, the application of various new materials and new processes is an important aspect to promote the development of centrifugal pump technology. Centrifugal pump parts and spare parts using a variety of new materials and new technology to extend the life of the pump in the corrosive media and reliability, expanding the scope of the centrifugal pump. At the same time, the application of coating technology and material surface treatment technology plays an important role in improving the flow characteristics, corrosion resistance and wear resistance of the centrifugal pump, which has greatly improved the environmental adaptability of the centrifugal pump. Different uses, choose different characteristics of the mechanical seal is also very particular about. Such as the ship bilge pump summer temperature is particularly high, the selection of seals should have high temperature anti-aging properties; nuclear submarine with a large submersible centrifugal pump to withstand high back pressure, the selection of rubber parts with high compressive properties. In addition, since the mechanical seal is a wearing part, the frequency of maintenance is much higher than that of other parts, and the centrifugal pump is often disassembled during the repair. In some cases, the space may be damaged and the structure of the cabin may also be damaged, which requires heavy workload. Therefore, to ensure reliable mechanical seal, mechanical seal to extend the service life is very important. In the course of design, it is suggested that CMZ type ship pump assembled mechanical seal be used as the priority, of course, if the reliability and safety requirements are particularly high, the more advanced self-cooling seal device can be selected, which can greatly Reduce the failure rate. Centrifugal pump design in addition to hydraulic properties and materials, mechanical seal selection, with particular attention to vibration and noise issues. In recent years, vibration and noise reduction has become a crucial requirement in order to order the entire national defense industry, especially the Navy's general assembly equipment. Because the size of vibration and noise during the operation of a pump is directly related to the distance that the warship is detected by an enemy during combat Probability, so in this area at the moment, the vibration noise index does not mean to meet the national or industry standards can be. The vibration noise and centrifugal pump structure, material selection are closely related, as far as possible to design a flexible connection structure, the use of good sound-absorbing properties of the material. Standardization is an important trend in the development of centrifugal pump technology. Centrifugal pump industry in the current ship centrifugal pumps, mostly in a single small batch production. The reason, on the one hand is the supremacy of the purpose of the customer, resulting in as long as the user requests, whether or not reasonable, even if there are existing products can adjust the selection of models, the business is still tailored to user requirements; the other hand, In order to improve the market competitiveness of enterprises 1, the leading domestic centrifugal pump manufacturers deliberately set up technical barriers, the sealed capsule, pump body, guide vanes and other designed into a special structure. As a result, not only greatly increased the design and manufacturing costs, but also to the after-sales maintenance services increased unnecessary trouble, often chaos spare parts, maintenance costs rose sharply. Therefore, the implementation of centrifugal pump components has been imminent standardization. The implementation of standardized centrifugal pumps, only a few special parts and common parts can constitute the entire centrifugal pump series, which can reduce production costs and shorten the delivery time, reduce parts and spare parts inventory, to save energy. This point, from Japan and Italy saw the centrifugal pump only see the fixed number of parts can confirm the name. Centrifugal pump manufacturing Energy-saving manufacturing enterprises to develop higher than the national or industry standards of enterprise standards, improve the casting process, find ways to reduce the hydraulic losses. In the manufacturing process of the strict control of the process, the use of advanced three-dimensional wax mold rapid prototyping software to generate precision models to improve the over-flow components of the linear accuracy and cavity smoothness, meticulous treatment of parting surface, , In order to improve the hydraulic performance of the centrifugal pump, to achieve the purpose of energy-saving centrifugal pump. Design and manufacturing units should also pay attention to the use of centrifugal pump on-site technical training, the basic structure of the centrifugal pump, working principle, common causes of failure and treatment methods to fully preach, technical services throughout the entire process, the user problems Compensation services to move forward to help users correct selection, users are invited to participate in the design, business and user interaction, to achieve a win-win situation. Centrifugal pump system energy-saving centrifugal pump connection Accessories with the system energy-saving mainly includes the centrifugal pump and motor or diesel engine connection, pipe network design, related accessories, such as connection and cooperation. Such as pipe joints filter settings, should follow the short, straight, less principle, try not to set the throttling device. Select low vibration and low noise products for motor or diesel engine and configure the optimal driving power according to the rated power and efficiency of pump to avoid the vibration of vibration isolation device as far as possible in the pump group of "big horse pull cart" or "small horse cart" Join. Dashboard stainless steel seat connection. On the need to install self-priming device to achieve self-priming function of ordinary vertical seawater pump, pressure gauge installed in the import and export pressure gauges try to use high-quality copper pipe to reduce resonance in the system operation, the pump system every Part of the maximum can play their own role, thereby enhancing the overall efficiency of the centrifugal pump system and service life. The integration of mechanical and electrical instruments, whether small and medium-sized pumps or other general-purpose pump, or large industrial pumps, especially military products, are in the unit, electric control, instrumentation, monitoring the direction of the continuous development. If the foreign fire fighting system for the development of far-sea combat ship, how to fire water cannons, water pumps, alarm systems, monitoring instruments and other parts organically integrated into a functional whole? This requires an effective electronic control system to manipulate. Such an integrated function makes centrifugal pump products more efficient, energy-saving, more convenient to use and maintain, improves product reliability, prolongs service life and brings greater benefits to users. The use of centrifugal pump energy-saving centrifugal pump pipe reasonable arrangement Centrifugal pump unit to use the environment preparation, should be technically and economically considered. Pipe layout should be arranged as straight pipe, pipe fittings to minimize attachments and components, to the greatest extent possible to reduce the length of the pipe must bend at a radius of curvature to take pipe diameter 3 to 5 times is appropriate, the best corner is greater than 90 °, This minimizes pipe loss. Good maintenance The use of units to develop the appropriate systems and processes, regular centrifugal pump system for serious maintenance and care. Good maintenance can make centrifugal pump system in the best running state, and through daily maintenance and repair timely detection of existing problems, timely maintenance and maintenance, to extend the life of the centrifugal pump system. Cost savings, but also a good way to save energy.
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