When the liquid was shaken to the impeller exit, the impeller inlet center to form a low pressure in the suction tank and the impeller at the center of the liquid produced a pressure difference between the suction tank in the liquid under the effect of this pressure, The ground through the suction pipe and pump suction chamber into the impeller. Lanshen pump repair pump the most important attention to detail, whether it is centrifugal pumps or other forms of pumps are the same, I remember once a maintenance of the pump for many years a master because the pump body a small screw did not make the final result Pump failure is completely damaged.
The midline of the impeller exit center line, or the impeller exit width, in the volute pump should be aligned with the volute inlet centerline. So that the impeller in the rotation process, while constantly inhalation of liquid, while constantly to the inhalation of liquid with a certain amount of energy to the liquid discharge, so that centrifugal pump to work continuously. If the missing, it should be in the impeller wheel shaft and shoulder pad by adding additional adjustment. The two center lines should be controlled within the range of 0.5 mm. For a pump with a slightly lesser number of rotations, the effect on the performance of the pump is not significant. For pumps with medium to low specific speed, because the impeller exit is very narrow, for example, the impeller outlet is only 10 mm wide. If the volumetric center line is 1 mm, Of the performance there is a clear impact. It is recommended to adjust the error of the two midline (impeller and volute) within 5% of the impeller exit width.
The same is true for multi-stage pump, is to control the impeller exit center line and guide vane import center line error. Spatial guide vane pump, preferably with the data given in the assembly diagram to determine the position of the impeller in the space guide vanes. If there is no drawing, or empirically, or through the test results to adjust the position of the impeller.
1.The arrangement ways of pump
(1) open-air arrangement
Generally concentrated in the pump arranged under the gallery or the side can also be arranged around the miscellaneous suction equipment, the main advantage is good ventilation, manipulation and maintenance convenience. If the pump layout below the maze of the gallery, the pump outlet center line should be aligned from the central line of the pillar column 0.6m.
(2) semi-open arrangement
Semi-open arrangement of the pump used in rainy areas, generally arranged in the gallery below the pump, located in the upper part of the pipe roof. Or the pump is arranged on the lower floor of the frame, and the frame platform is used as the ceiling. According to the pump layout requirements, the pump layout in single row, double row or multiple rows.
(3) interior arrangement
Indoor arrangement of the pump for cold or sandy areas, and the process has special requirements of the occasion.
2.The arrange requirements of pump
(1) for open-air or semi-open-air pump arrangement, the pump is usually the original idea of the axis and pipe axis perpendicular to the axis.
(2) for indoor pump, when the delivery of liquid temperature is higher than the natural point or liquid transport of liquid hydrocarbons should be arranged with the other pumps were mixed in their respective rooms, and separated by a firewall.
Pump layout in the room, generally do not consider the motor vehicle inspection requirements. Pump side or side of the pump and the distance between the wall should not be less than 1.2 ~ 1.5m, two rows of pumps should not be less than the distance between 2m.
The position of the withdrawing piston and rod should be left on the power and pump sides of the steam reciprocating pump.
Vertical pump installed in the gallery below the bottom of the frame or frame, the top should be set aside for the pump installation and inspection of the space required.
In these several days, cold air suddenly gather down, and instantly felt the winter atmosphere. Today we tell you how to prevent the sewage pump freezing in winter. In this case, customers in Xinjiang, Tibet can use now.
In winter, sewage pump users are most worried about is freezing. So how to prevent the sewage pump freezing in the cold winter? How to protect the sewage pump in cold areas can operate normally? With these problems, we will share some tips about how to prevent the sewage pump freezing.
1.Heating sewage pump casing or in the sewage pump into the hot water.
2.Placing sewage pump in a room temperature environment.
3.Placing the sewage pump in well which deeper from the ground.
4.If the sewage pump is the insulation type sewage pump, we can add steam or hot water in the insulation layer.
5.When the sewage pump idle, we need to drain the water within the sewage pump to add water when used.
The above content is the summary of sewage pump maintenance, and prevent the sewage pump freezing in winter, hoping to be helpful to the majority sewage pump users.
In the use of the pump, it often occurs oil backstreaming and affects the normal use, caused some confusion today. Now we will introduce some tips to prevent water pump oil backstreamingwith:
1.Shaft seals static sealing parts to be reliable, when the conversion;
2.Add tube in the oil hole,so that the oil level is only slightly higher than the inlet;
3.The pump’s exhaust valve near the oil and other oil separated from the oil level is only slightly higher than the wall;
4.Set the pump and auxiliary organizations, stop the pump to block the oil;
5.The pump port equipped with inflatable valve;
6.The fuel tank and exhaust valve in the next side to reduce the oil level, reducing fuel consumption;
7.Pump base plane to be flat, plus the elastic film;
8.Set the pump check valve organization, closed the oil hole automatically when stop the pump.
At present, China’s low-end pump industry has been basically realized in the field of domestic, high-end areas also by virtue of cost, service and other advantages to achieve the gradual replacement of imported products, and is committed to the pump industry, international competition. But in the impact of internal and external factors and many uncertain factors under the impact of domestic-funded enterprises in order to achieve the simultaneous development of the market, need to speed up the casting of “domestically produced advantages” in order to counter the international giants of flooding the pump market in China.
China’s pump industry is now in a relatively favorable demand for the development period, but also because of this many companies are trying to valve enterprises to expand the scale to achieve long-term or sustainable growth. At the same time, China’s pump industry has also ushered in a lot of new subjects to join. However, it is precisely because the collision between the two sides led to a “big but not strong,” the status of the pump industry.
From this, China’s pump industry in order to achieve sustainable development, expansion of enterprise scale is on the one hand, strengthen enterprise technology research and development and product development capability is the key. In other words, in the homogenization of the more serious at this stage, in order to maintain or stimulate the development of an industry must be to differentiate the competitive advantage to support, and “differentiated competitive advantage” is necessary to meet the current economic development needs But also to meet the target market demand, so as to achieve a sustainable development of China’s pump industry.
The emergence of pumps for human life and production are very important. There are various water lifting devices in ancient times, such as the Egyptian chain pump (before the 17th century), China’s orange (before the 17th century), the pulley (before the 11th century), waterwheel (AD 1 century), and the 3rd century BC Ancient Greece Archimedes invented the spiral rod and so on. About 200 BC, the ancient Greek craftsmen Cesius Beius invented the most primitive piston pump – fire pump. As early as 1588 there will be on the 4 blade vane pump records, after the emergence of a variety of other rotary pump. In 1689, the French D. Papan invented the 4-blade impeller centrifugal pump volute. In 1818, the United States appeared with radial straight blade, semi-open double suction impeller and volute centrifugal pump. 1840 ~ 1850, the United States H.R. Worthington invented the pump cylinder and the steam cylinder directly against the steam piston pump action, marking the formation of modern piston pump. 1851 ~ 1875, with guide vanes of the multi-stage centrifugal pump have been invented, so that the development of high-lift centrifugal pump possible. Subsequently, a variety of pumps have come out. With the application of advanced technologies, the efficiency of the pump has been gradually improved, and the range and application of the pump has been expanded.
With the design and manufacturing technology and application technology of pump continue to improve, the pump manufacturing and production is along the large-scale, large capacity, high-lift, high-speed, serialization, universal, standardized direction. The automatic control level of pump station is higher and higher.
1. Large-scale, large-capacity
In recent years, the development of large-scale water pump technology very quickly, giant axial pump impeller diameter has reached 7m, submersible pump impeller diameter has reached lm. The new centrifugal submersible pump pumping flow has reached 1800m3 / h, the corresponding head llOm, the maximum water output of 28800m3 / h, the maximum capacity of the water pump up to 60000kW; H, and a further expansion of the trend. In the pump station, there have been a number of new large-scale structure of the pump station, such as “egg” structure pump station, out of the water pipe, pool construction pump station. With the promotion of the use of submersible pumps in the drainage, the corresponding emergence of a number of small space, investment, structure of the new large and medium-sized pump station, such as steel or reinforced concrete constructed wet well pump house structure.
2. High-lift, high-speed
With the pump cavitation, material strength and other issues continue to improve, the pump speed is also faster. In the 20th century, 80 years, the international level of multi-stage centrifugal centrifugal pump speed of 7500r / min, has now increased to 10000r / min. Increasing the speed of the pump will inevitably raise the lift. In 2009, the boiler feed pump single-stage head has broken the record of 1000m, multi-stage pump head can reach more than 2000m. To further achieve high-lift, is bound to improve the pump speed. Later, with the continuous progress of technology, pump speed to further high-speed direction. In the pump industry, this high-speed development trend is a worldwide.
3. Serialization, generalization, standardization
Product serialization, generalization, standardization is a modern industrial production process of the inevitable requirement. In 1975 the International Standardization Association has developed a rated pressure of 720kPa single-stage centrifugal pump main dimensions and specifications (ISO 2858-1975E). The standard pump performance range: flow rate of 6.3 ~ 400m3 / h, head 25 ~ 125m. In 2009, in Europe where the pump to meet this specification have been sold as a standard pump. China since 1958, in the unified model, series classification, size, etc. has also done a lot of work, water pump bracket, suspension, bearing frame and other major components have been a series of standards, the product of the “three “The degree of continuous improvement.
4. Pump station automation level rises progressively
In recent years, the pump station automation equipment more and more perfect, automatic control level is higher and higher. Modern pump station from the unit start, monitor operation, shut down to the multi-stage pumping station system regulation, optimal scheduling and so can achieve automatic control, computer technology and network systems in the automatic control of pumping station applications are increasingly widespread, the management level In the gradual increase.
With the development of science and technology, such as atomic energy and combustion industry, it will further require the development of a variety of special pump products with high speed, high temperature and high pressure, high efficiency and large capacity, and also constantly improve the quality of existing conventional products. Level. To achieve this goal, must be in the basic theory, computing technology, model testing, measurement methods and materials selection, processing technology and a series of links to innovation. In pumping station design and operation management, should take active measures to maximize the efficiency of the work of the pump to improve the level of automation and control of pumping stations.
In recent years, China’s pump industry has entered the forefront of the world. Of which at least 70% of private enterprises, with a vast market and consumption potential for the development of China’s pump industry the main force. Lanshen group’s products are based on foreign demand for the pump industry, the export side of a number of adjustments to expand the external market, from the sales point of view, the results are gratifying.
As the talent, technology, equipment, management level that the concept of the introduction and application, Nanjing Lanshen Group‘s variety of products in the same industry leading position, not only that, the deep blue pump also has a comprehensive integrated service system : Including the early professional and technical personnel to quickly answer the technical advice to meet your needs, you choose the right products, provide reasonable and reliable recommendations on the quality of products, such as the commitment to supply cycle, to provide specific product programs and pricing. After-sales include: to provide product installation, use, maintenance, troubleshooting and other services.
In addition, lanshen pump has the highest level of domestic pump performance testing center, all products using CAD design software and CFD computational fluid dynamics software and other advanced design tools, all products through precision casting, hot forging, welding, heat treatment, finishing, assembly And the use of information technology, automation technology, modern control and management technology, so that the level of machinery products and service levels to a new level.
In recent years, the development of pump industry has been greatly improved, especially in the fields of industry and agriculture, such as centrifugal pumps and submersible pumps. The state-owned enterprises are the leading enterprises, Private enterprise as the mainstay of a number of regional industrial clusters, both to promote the local economic development, but also to promote the industry’s progress.
The 21st century, China’s domestic water pump development environment is good, the pump investment prospects report shows that all industries rapid growth under the policy. Pump industry to be outdone, give full play to their own advantages, in the fierce competition in the market take the initiative. The current status of the development of the pump industry is Masamori, the state support policies to give greater improvement in the market demand has also increased, the pump industry as a result of fierce competition within the industry also makes the domestic pump-related technology excellence.
China’s pump industry to have a long-term development, we must adjust and optimize the industrial structure of the pump, it is necessary to continue to give full play to the advantages of traditional water pump industry, but also to develop knowledge, technology-intensive industries and new industries to promote the pump industry upgrade.
With the economic recovery and government support for our business, both challenges and opportunities for development, the face of such a huge development market, the domestic water pump companies to seize this opportunity to develop, by optimizing the industrial structure, improve product quality, Grasping network sales to create their own brands, to produce comparable to the international market, pump equipment.
Pump companies can only be fast in stable, refinement in fast , stability in refinement, can enable enterprises to survive and develop in the pump industry which in increasingly fierce competition.