Kaplan turbine runner static balancing test device based on stress bar method, and method

Abstract

The invention discloses a Kaplan turbine runner static balancing test device based on a stress bar method, and a method. The test device comprises a balance support plate for supporting a runner body,wherein a bottom of the balance support plate is provided with a stress bar, the stress bar is supported at the top of a balance base, and a strain gauge group is adhered on the stress bar; and blades are mounted at the outside of the runner body. The device and the method provided by the invention substitute the conventional steel ball and runner plate method, are used for Kaplan turbine runnerstatic balancing, and consequently improve test efficiency and accuracy, reduce test safety risk, solidify the test device, reduce test device cost and provide guarantee for a runner static balancingtest of a power plant set.

Description

technical field [0001] The present invention proposes a static balance test device and method for runners of axial-flow paddle-type water turbines based on the stress bar method, which is suitable for static balance tests of large and medium-sized axial-flow paddle-type water turbine runners, and the unevenness of the runners can be accurately calculated using the method Measuring and eccentric orientation have certain practical value. Background technique [0002] In order to increase the output of the unit in a hydropower station, the capacity of the turbine and generator was increased. After the turbine runner was manufactured and installed, a static balance test was required to eliminate the influence of the static unbalance of the runner on the vibration of the turbine. The traditional static balance test method of the runner is the steel ball mirror plate method. This method mainly has the following disadvantages: 1. The surface hardness, roughness and local depression...

AI Technical Summary

Problems solved by technology

The traditional static balance test method of the runner is the steel ball mirror plate method. This method mainly has the following disadvantages: 1. The surface hardness, roughness and local depression of the balance ball and the balance mirror plate are strict; 2. The test period is long , the calculation is cumbersome, and it needs to go through four stages: initial balance, sensitivity inspection, blade counterweight, and total balance; 3. Due to the limitation of the material performance of the balance mirror plate, this method is generally used for runners with a mass of no more than 250 tons; 4. Test device The versatility is poor, and different types of runners need to use different test devices; 5. The key components of the test device are easily damaged, which increases the test cost; 6. There is a large safety risk, and the runner assembly may occur during the test. dump

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