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Rotary piston pump performance advantages and application prospects
Reciprocating piston pump and centrifugal pump are two kinds of comprehensive performance excellent pump. Before the advent of high-speed prime mover such as electric motor and internal combustion engine, the reciprocating piston pump is the leading product of the pump. The reciprocating piston structure is the basic structure of the variable-volume pump. The principle is simple and efficient high pressure. However, with the advent of power generation technology and electric motors, centrifugal pumps have been rapidly developed due to their simple structure, ease of use in connection with electric motors, and their ability to operate over a wide range of flow and lift. Reciprocating piston pump working mode and rotating power is not convenient, complex structure and large volume, high-speed operation is limited, and the flow is small, and thus completely replaced by a centrifugal pump, centrifugal pump and then become the leading product of the pump into the heyday has continued For a century, the research of pump technology has become the research of the structure of centrifugal pump, becoming a specialized discipline of mechanical design and manufacture. Reciprocating piston structure basically withdraw from the pump applications, but its characteristics of high efficiency and high pressure has been used in the pursuit of high performance special pumps and internal combustion engine structure. Centrifugal pumps are non-positive displacement pumps whose flow rate varies greatly with pressure. Efficiency changes with speed, flow, lift changes, relative volumetric pump, its efficiency is low, some applications are limited. Centrifugal pump characteristic curve and performance parameters are the external manifestation of the fluid motion parameters in the pump. The fluid motion in the pump is determined by the pump speed and the pump geometry. Centrifugal pump geometry and design parameters flow Q, lift H, speed n, the design parameters determine the geometric parameters, the design parameters are multi-variable parameters, the design parameters are related, and the geometric parameters between the complex Nonlinear relationship, so a rigorous analysis of the pump fluid situation is difficult. Centrifugal pump geometry parameters are determined, the performance of the centrifugal pump with the use of design parameters that change dramatically after the use of conditions deviate from the design parameters, centrifugal pump performance fell significantly, mainly by the centrifugal pump working principle and structure of the limited . Centrifugal pump technology has matured from design to application for decades to improve the performance of centrifugal pumps, but in many applications or occasions need to further improve the performance of the pump. Only based on the principle of centrifugal pump to improve its structure, hope pump performance greatly improved, very difficult. In order to improve the performance of the pump, find a new principle, the new structure of the high-performance pump to replace the centrifugal pump is particularly important, breaking the traditional limitations of innovative thinking, not necessarily to improve the performance of the pump is limited to the centrifugal pump Structurally. Rotary piston pump is a new structure of the pump, the working conditions are very reasonable, the use of variable-volume compression principle of work, direct rotation drive, relative to the centrifugal pump has a series of outstanding performance advantages, rotary piston pump structure complexity and centrifugal Like the pump, it consists of a shell and a rotor with vanes. The rotor forms a continuous rotating volumetric zone with the shell, forming a continuous expansion and compression to achieve pumping and pumping functions. Rotary piston pump continuous flow without pulsation, the working principle is very simple, the theoretical analysis and design and reciprocating piston pumps, centralized centrifugal pumps and reciprocating piston pump two kinds of the best of the best double pump, its outstanding performance advantages as follows: 1 , High efficiency, efficiency of 70% -95%, energy-saving effect is very significant, especially small and medium-power pumps, the efficiency is stable, does not fluctuate with the head changes. 2, small size, the same flow Rotary piston pump volume is much smaller than the centrifugal pump, flow volume is only a fraction of the centrifugal pump, which is light weight, easy to install. 3, the operating conditions are reasonable, the working principle is simple, the design of the pump becomes very convenient, it is easy to design suitable for a variety of special purpose high performance pump. 4, the design parameters and the geometric parameters of the pump is simple, no strict requirements on the flow of the pump body, according to the requirements of the design pump body shape, suitable for deep well pumps, submersible pumps and other special shape pump. 5, simple structure, easy production and processing, low prices. 6, pressure, variable volume compression pump is prone to high pressure, high pressure conditions can maintain high efficiency, single-stage rotary piston pump can easily achieve tens to hundreds of meters of lift, especially for high pressure The place. 7, with self-absorption function, to bring great convenience to use. 8, rotary piston pumps for the constant flow pump, flow and head has nothing to do, flow and speed is proportional to the pressure and torque is proportional to constant flow rate constant flow, is a metering pump. 9, a wide range of speed changes, speed from tens to tens of minutes per minute can work properly. 10, a wide range of applications, flow from a few cubic meters per hour to tens of thousands of cubic meters per hour, can apply rotary piston pump structure. 11, can be easily connected with a variety of power sources, electricity, internal combustion engines, wind, water, manpower and so on. 12, bidirectional reversible, rotary piston pump can be made into a symmetrical structure, changing the direction of rotation, access to the outlet can be reciprocal. 13, Rotary piston pump used in turn, can be used as a hydraulic drive machine, control the hydraulic pressure water, you can output power. 14, rotary piston pump flexible design, inlet and outlet can be designed on an axis, directly connected to the water pipeline, can be used as a pipeline booster pump. As mentioned above, the overall performance advantages of rotary piston pumps are much higher than centrifugal pumps and other pumps, is a major innovation and breakthrough in the field of water pumps, one or several combinations of performance advantages have great application value All of these performance advantages combine to improve existing pump performance specifications in many areas. To achieve the purpose of replacement. Many problems in the centrifugal pump structure is difficult to solve, the application of rotary piston pump structure can be easily solved, and derived from many new applications. Give an example to illustrate the application, 120 motor-driven rotary piston pump with self-priming function, the pump body shape Φ55 × 75mm, flow 3.5 tons per hour, head 10 meters, the motor can work continuously, increasing the motor power lift can be increased to 100 meters above, self-suction distance greater than 5 meters. Can drive 4 low-pressure sprinkler nozzle, nozzle spray radius of 10 meters, sprinkler irrigation area of ​​1-2 acres. Pump performance is much higher than the same power centrifugal pump. Can also be demonstrated from the principle of design comparison, the hourly 10,000 cubic meters of high-flow pump, pump body circumference height of 1.2 meters, a thickness of 1 meter, the volume and weight of the same flow centrifugal pumps a fraction of the pressure It is easy to exceed 100 meters, the efficiency of more than 90% -95%, a wide range of work pressure to maintain constant flow and efficient features unchanged. Rotary piston pump can be made into a variety of high-performance pumps for the purpose of use. Modern society, the use of large pumps to improve the performance of the pump is not only to meet the needs of a few special pumps, but can produce significant social, economic and ecological benefits of things, a huge amount of water pump, energy consumption is also very Huge, most efficient use of small and medium-sized centrifugal pump power efficiency of 40% -70%, if the use of rotary piston pumps, the pump efficiency increased from a few percent to dozens of percent, the economic benefits of energy-saving pumps will be very impressive , A large lift project consumes hundreds of thousands of kilowatts of electricity, the daily electricity consumption of several million dollars, if the pump efficiency is improved by a few percent, the economic benefits of energy-saving will be self-evident. Pump performance will lead to the development of many related fields of application, and can open up some new pump applications, the most representative is to promote the country to promote water-saving irrigation has made considerable progress, and then bring about good The social and ecological benefits. The following brief introduction of some rotary piston pump applications and development prospects. Low-power rotary piston pump pumps: Low-power pumps are widely used in civil, water-saving irrigation, food processing, chemical, pharmaceutical and other fields, centrifugal pumps as a low-power pump, less efficient in some applications even lose their practical value. For example, man-made pumps, centrifugal pumps under human-driven conditions by the speed, and the size of the pump body, low efficiency. Eighties of the national organization several provinces trial bicycle pump design and finalization of several models, but all due to the limited performance of centrifugal pumps, efficiency, head, flow can not meet the practical requirements, failed to be promoted. Manpower is the most convenient power, in many occasions need to use man-made water, the most common is to pump up in the well hand pump, popular around the world, it works is the reciprocating piston structure. Human convenience but very valuable, the first indicator to pursue human pumps is efficiency. In recent years, the method of rainwater harvesting and rainwater harvesting in the northern part of China has been feasible and effective. Therefore, it has been vigorously promoted. However, as of now, convenient, practical and efficient water-saving irrigation methods are not yet available and the society urgently needs related products. Rainwater harvesting mostly for poor natural conditions, power distribution difficulties, for which people developed a variety of manpower pump products for rainwater harvesting irrigation ancillary products, but the working principle is mainly reciprocating piston pump structure, the product structure is complex Large, reciprocating operation is not convenient, limiting the promotion. Rotary piston pump superior performance to meet the needs of manpower pumps, rotary piston lift pump head more than 10 meters, self-sucking more than 5 meters, the flow rate of 1-3 cubic meters per hour, can be hand-cranked or mounted on a bicycle, with micro Spray belt, low-pressure nozzle, micro-nozzle and other effective means of irrigation to better implement water-saving irrigation. Every year, the state subsidizes peasants with several billion yuan in investment to develop rainwater harvesting and irrigation. The development momentum is strong and the effect is very good. A large number of rotary piston manpower pumps are needed for rainwater harvesting and rainwater harvesting. Rotary piston manpower pump can easily hit the water tank on the roof or tank water storage device, with the convenient PVC pipe materials, composed of farmer-owned tap water to improve the quality of life, widely used in cooking, laundry, sand filter Purified water, solar water heaters and other domestic water bathing way. Rotary piston manpower pump can also be used for spraying pesticides, washing cars, planting trees and grass, construction, courtyard farming and so on, has a very wide range of uses, huge market potential. Low-power rotary piston pumps exceed centrifugal pumps in terms of efficiency, pressure, self-priming capabilities, and volume and power package flexibility, thus allowing them to derive many new uses and countries are promoting water-saving irrigation