Submersible pumps and sewage pumps are widely used, both are pump types, but different usage results the different function. Then how to distinguish the submersible pump and sewage pump, Nanjing lanshen Pump Corp.LTD. introduces its differences for you.
1.The use technology is different
Submersible pumps suitable for some special process requirements, such as leakage, special fluid medium. Sewage pumps are generally used for regulation, there are switching capacity, such as fan coil end.
2.Forms of switch are different
Submersible pump through the coil drive, can only open or close, switch action time is short. Sewage pump drive is generally used motor, open or close action to complete a certain amount of time required to do analog, you can do adjustment. Recommended reading: how to determine the head of the submersible pump
3.The working performance is different
Submersible pump general circulation coefficient is very small, and the working pressure difference is very small. For example, the general diameter of the submersible pump diameter of 15 than 15-valve ball valve is much smaller. Submersible pump drive is through the electromagnetic coil, relatively easy to be damaged by voltage shock. Equivalent to the role of the switch is to open and close the two roles.
Sewage pump drive is generally used motor, more resistant to voltage shock. Submersible pump is fast opening and fast closing, generally used in small flow and small pressure, the required switching frequency of the local sewage pump and vice versa. Sewage pump valve opening can be controlled, the state has on, off, half open halfway, you can control the flow of media in the pipeline submersible pumps fail to meet this requirement. Submersible pump can be reset when power cut, while sewage pump need to add reset device if with this function.
Since the founding of our company, strict implementation of ISO9001: 2000 “quality management system requirements.” The face of increasingly fierce market competition, the company has always been the first to pursue quality management objectives, adhere to the quality of survival, quality and development of the enterprise approach, the company has improved the production and technical testing equipment to ensure that each factory pump. But also occasionally because of misuse of the customer, resulting in submersible pumps burned, there are related issues, the following reasons describe the burning of the submersible pump:
1.The flow and head.
Such as the choice of the lift is too high, but easy to burn the motor, be careful not to reverse the water when the reverse small, large current, the reverse will damage the motor windings.
2.The installation of submersible pumps
Submersible pumps do not sink into the mud, otherwise it will lead to poor heat and burn the motor winding.
3.Try to avoid low-voltage boot.
4.Do not let the pump long-term overload operation, do not smoke large amount of water, dehydration pump running time should not be too long, so as to avoid overheating and burned the motor. During operation, the operator must observe whether the operating voltage and current are within the value specified on the nameplate. If not, the operator should stop the motor, find the cause and rectify the fault.
5.Some submersible pumps need to add lubricating oil in the sealed room, or mechanical seals easily damaged, the motor is easy to burn due to water.
The working condition of submersible pump is that the water pump and motor are submerged into the water, and the pressurized water is led out by the outlet pipe after the water pump is running. The main advantages of submersible pumps are:
1.Compact structure, small size. Submersible pump operation requires all the potential water inside, no additional workspace, so do not have to build a pump house to install them, can save not a small economic expenditure;
2.Operation, installation, easy maintenance. Submersible pump submerged into the water inside, the installation of a large space, unrestricted, slightly larger weight submersible pumps are equipped with automatic lifting coupling device, mobile is very convenient;
3.Long-time stable work. Submersible pump shaft structure is special, pumps and motors are the same axis, the shaft size is short, the weight of the rotor components are light, when working without bearing much axial force, life expectancy is higher than other pumps;
4.The submersible pump in the water under the work is fully enclosed, there will be cavitation damage to the pump, but also do not irrigation water, is very convenient;
5.The vibration of the submersible pump almost has no noise, the unit’s temperature rise is very small, in the water inside the cooling cooling without considering these situations;
As the excellent performance of submersible pumps, widely used in domestic sewage discharge, factory wastewater discharge, mine sewage discharge, water conservancy projects and other fields.
First check the cause of the thermal protector damage. If the thermal protector damage is caused by stainless steel submersible pump failure, should immediately overtake and remove the submersible pump failure; if the thermal protection damage is due to the quality of the thermal protector caused by thermal protector or the use of time Caused by too long, you should replace the same model, the same specifications of the thermal protector.
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.
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.
Head: refers to the energy obtained when unit weight of the liquid through the pump, the lift is also called the total head or head, with H said and the unit is meter.
Flow: refers to the amount of liquid supplied by the pump per unit of time, expressed in Q, in meters per hour or liters per second.
The number of revolutions: that is the number of revolutions of the pump in minutes, expressed in n, in revolutions per minute.
Shaft power: that is the power transmitted by the prime mover to the pump shaft, expressed in N, in kilowatts or horsepower.
Efficiency: shaft power is not all used by the pump and part of that has lost.
In the process of pump operation, the pressure inside the pump is changing at any time, when a part of the pressure lower than the minimum pressure of liquid gasification pump, it will automatically generate gas inside the pump. If this gas has been generated, will burst within the pump sound, so cavitation from the sensory point of view is very easy to judge.
Pump cavitation is generally operating and external conditions caused by the inappropriate, Lanshen group in the pump design and testing process, will also test the pump cavitation conditions. In general, the pump cavitation is caused by the following several reasons.
First, the suction pump is higher than the actual suction lift available. This can happen if the height of the pump is too high. Because the actual suction pump is too large, will lead to the pressure drop inside the pump is very low, it is prone to cavitation.
Second, the suction pump is too far. When pumping a liquid pump, if the suction process is too far away, may have some unforeseen resistance, the resistance will lead to the actual pump impeller to reduce the liquid pressure, resulting in the impeller below the spin nest, also produce cavitation.
Third, the pump water conditions are not stable. If the pump inlet pipe is curved, when the water, all parts of the flow rate is not the same. Differences in flow rate can lead to differences in liquid pressure, if the local pressure is too low, cavitation occurs.
Fourth, the use of local air pressure is too low. If the pump installed in the high altitude areas of the plateau, the pump inlet pressure will be reduced, but also prone to cavitation.