Introduction of various water pumps

Other pumps refer to special pumps other than vane pumps and positive displacement pumps. Other water pumps mainly include: screw pump, jet pump (also known as water jet), gear pump, water turbine pump and air lift pump (also known as air lift water machine). Among these pumps, in addition to the spiral pump is the use of spiral propulsion principle to improve the price of liquid energy, other pumps are the use of high-speed liquid flow or air flow (I. e., high-speed jet) of the kinetic energy to transport the liquid.
Although the application of these pumps is not as wide as the screw pump, but in the water supply and drainage engineering, combined with specific conditions, the application of these special pump meters to transport liquid, often get good results. For example. In the urban water leakage treatment/"11 ', when the precipitated sludge of the second sink flows to the aeration tank, spiral pump or air lift system is often used to lift it. The jet pump is also widely used in the application of prescription 4 of J for water treatment, and is usually used to add coagulant or disinfection punishment, etc. Q
The above various types of water pumps are used in the same range. Prisoner 13 shows the general type of several commonly used pumps. As can be seen from the figure, the application range of mustard chestnut focuses on high lift and small flow. The application range of diaphragm pump and mixed flow pump focuses on low uplift and large flow members. The application range of centrifugal pulp is between the two, with the widest working range and the largest number of species, series and specifications of products.
For urban water supply projects, the lift of the water supply pump station is between 20-tM m, and the use range of the pump flow' is generally 50-]o coffee m1/h, which is very appropriate to meet such working interval * as can be seen from the general spectrum chart. Even in some large water plants, multiple centrifugal pumps can be connected in parallel in pumping stations to meet the water supply requirements.
amount of requirements. From the perspective of drainage engineering, urban sewage pumping stations and rainwater pumping stations are characterized by large flow and low lift. The lift is generally between 2-12xn, and the flow rate can exceed] o delete m1h. In such a working range, it is generally more appropriate to use axial flow pumps.
To sum up, in cities and towns and]: water supply and drainage for industrial enterprises: sleeve flow pump in l process.
At present, the general trend of pump development can be summed up as follows:
1. Large-scale and large-capacity
Ten noon ago, if the emergence of a 50000 kw generator set was regarded as a major technological achievement. Well, in today's big power is just a feed pump that can drive a 1.3 million kw large steam turbine generator set. In recent years. Large-scale water song technology is developing rapidly. The diameter of R4 wheel of riverside rail flow pump has reached 7m, the diameter of submersible pump impeller has reached 1m, and the power of small double suction centrifugal beam used in water supply projects of urban and industrial enterprises has reached 5560 kw.
2. Business smooth, high-speed.
State zygomatic. Records of single-stage Yang Cheng Si Li Li Li Xi 1rDo m in boiler water system. To achieve high lift, it is necessary to increase the speed of the pump. In the future, with the continuous improvement of water and spring cavitation, material strength and other issues, the speed of the pump may be further developed to the high-speed force. In the water pump industry, this high-speed development trend is worldwide.
3 Serialization, generalization and standardization
The serialization, generalization and standardization of production (referred to as "three") are the inevitable requirements of modern industrial production technology. In 1g5, the international association for standardization formulated the main dimensions and specification parameters (old) of grade 1 centrifugal pump with rated pressure of 7-blade LPn 2858] 975t). The performance range of this standard difficult pump is: the flow rate is 6.3-4 concave IJ/h, and the head is 25-[25,n. [: I
In Europe, all pumps that meet this specification have been sold as standard pumps. Since China's White 1958iF, a lot of work has been done in terms of unified guide, series classification, and sizing. The bracket, suspension, bearing frame and other major parts of the water pump have been avoided by series of standards. The degree of "three-way" of products is continuously improving,
In the future, with the development of science and technology such as the atomic energy combustion industry, it will further require the development of various water pump special products with high speed, high temperature and high pressure, high efficiency and large capacity; at the same time, it is also required to continuously improve the existing conventional products. Quality and level. All of this means that innovations must be made in a series of links such as frog-based theory, juice calculation technology, model testing, measurement methods, material selection, and addition: t technology. The future is an extension and continuation of the present, and this task is very glorious and arduous.