Low-specific speed small mixed flow water turbine

Abstract

The invention relates to a low-specific speed small mixed flow water turbine which is used for a water-cooling tower system. The low-specific speed small mixed flow water turbine is formed by connecting a volute casing, a guide vane, a rotary wheel and a tail water tube in sequence, wherein the centers of the volute casing, the guide vane, the rotary wheel and the tail water tube are arranged on the same vertical axis; the low-specific-speed small mixed flow water turbine is characterized by further comprising a twisted blade which is arranged between a rotary wheel upper canopy and a rotary wheel lower ring, wherein the thickness, in the direction vertical to the bone surface, of the twisted blade is equal; the ratio of the thickness B1 of the twisted blade to the water inlet height B2 of the twisted blade is 0.1-0.15; the water inlet height B2 of the twisted blade is the same as the height B3 of the guide vane; the ratio of the water inlet height B2 of the twisted blade to the diameter D1 of a water inlet of the rotary wheel is 0.1-0.2; and the radial section of the volute casing is rectangular. The low-specific-speed small mixed flow water turbine has the advantages of being high in operating efficiency, good in hydraulic performance, low in manufacturing cost and the like, and can be used for satisfying the needs of driving an air blower in the water-cooling tower system.

Description

[0001] technical field [0002] The invention relates to a water cooling tower system, in particular to a small mixed-flow water turbine with low specific speed. [0003] Background technique [0004] With the rapid development of my country's energy and power technology, water turbines can be matched with hydropower generators as key equipment for power generation, and can also be used in water cooling tower systems to absorb water residual pressure and convert them into mechanical energy, replacing motors in water cooling tower systems. It has become a new trend in the application of hydraulic turbines today. However, compared with the traditional turbines used in hydropower generators, the hydraulic turbines used in water cooling tower systems have greater differences and higher requirements in terms of specific speed, structure, and working parameters. Therefore, in recent years, this field has continued to The multi-style small turbines used in water cooling tower syst...

AI Technical Summary

Problems solved by technology

Although these new turbines can reflect the requirements of improving energy saving, large output and high efficiency to a certain extent, there are still problems such as insufficient increase, high requirements for the manufacturing process of main components, and high manufacturing costs of the whole machine.

[0005] Chinese patent application 200710036684.0 discloses "a double-clicking frog-singing water turbine". The scheme improves the efficiency of the water turbine by setting the remaining two sides of the casing and the vortex chamber between the water inlet and the water outlet of the water turbine so as to better It is suitable for the use of cooling towers with small water heads, but there are still the following shortcomings. First, the water in the runner of the turbine flows without pressure, making its hydraulic performance unstable and low in operating efficiency; second, the turbine's The structure is more complex, which is not conducive to mass production

[0006] Chinese patent application 200910028482.0 discloses "an ultra-low specific speed Francis turbine", which adopts the low specific speed turbine blade as the airfoil blade and the trapezoidal metal volute as the turbine volute to solve the low-speed Francis turbine in the prior art Low efficiency and complex structure, but there are still the following shortcomings. First, the manufacturing process of the airfoil blade is complicated, and the dimensional accuracy is difficult to guarantee, which affects the operating efficiency; second, the manufacturing cost of the water turbine using the trapezoidal volute and the airfoil blade is high. Not conducive to promotion

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