Rotating wheel static balance measuring device and experimental method

Abstract

The invention relates to the field of rotating wheel static balance measurement, in particular to a rotating wheel static balance measuring device and an experimental method.The rotating wheel static balance measuring device comprises a testing platform, a plurality of pressure sensors are arranged on the testing platform, and the pressure sensors are arranged in a surrounding mode to form a circular ring; a placing space allowing the bottom of the impeller to enter is formed among the plurality of pressure sensors; the test platform and the pressure sensors are arranged in a circumferential mode, the impeller is placed above the pressure sensors, a static balance test is carried out, according to information fed back by the pressure sensors, if mass eccentricity exists in the part, corresponding configuration blocks can be welded on site at the corresponding positions, and the impeller can be prevented from rolling over. The whole operation process is convenient, and efficiency can be greatly improved.

Description

Technical Field

[0001] The invention relates to the field of runner static balance measurement, in particular to a runner static balance measurement device and an experimental method. Background Art

[0002] The turbine runner is one of the four key flow-through components of a turbine and a crucial component in its operation. It is the rotating wheel within the turbine mechanism, and its primary function is to convert water energy into mechanical energy. In a hydropower station, water from an upstream reservoir is directed through a diversion pipe to the turbine, driving the turbine runner to rotate, thereby driving the generator to generate electricity. The completed water is then discharged downstream through the tailwater pipe. The higher the head and the greater the flow rate, the greater the turbine's output power. Therefore, the core function of the turbine runner is to achieve the conversion of water energy into mechanical energy, which is the core mechanism of turbine operation. The main purpose of the static balance test of the turbine runner is to eliminate the mass eccentricity caused by the manufacturing process, thereby reducing or eliminating the phenomena of large main shaft swing, bearing eccentric wear or large unit vibration during the operation of the turbine, so as to ensure the safe and stable operation of the hydro-generator set. The static balance test of the turbine runner in the current market can only be carried out in the equipment processing plant, and the measuring equipment is large, which seriously occupies the test site. Now a device that can be used for testing under practical on-site conditions is invented, which not only occupies a small area and has high measurement accuracy, but is also more practical for on-site equipment to do static balance test. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that it is necessary to set up a device that can be used to perform static balance tests under on-site conditions and can directly test and deal with defects.

[0004] The above technical problem is solved by the following technical solution: The present invention proposes a static balance measuring device for a runner, which includes a test platform, on which a plurality of pressure sensors are arranged around to form a ring, and a placement space into which the bottom of the impeller can enter is formed between the plurality of pressure sensors; and a column is provided on the outside of the test platform to prevent the impeller from tipping over.

[0005] In a preferred embodiment of the rotor static balance measuring device of the present invention: the test platform is further provided with a level sensor for detecting whether the test platform is level.

[0006] In a preferred embodiment of the rotor static balance measuring device of the present invention, a hydraulic jack is provided at the bottom of the test platform.

[0007] In a preferred embodiment of the rotor static balance measuring device of the present invention: a plurality of first mounting grooves are provided on the test platform, each of the first mounting grooves corresponds to the pressure sensors, and the first mounting grooves are used for placing and mounting the pressure sensors.

[0008] In a preferred embodiment of the rotating wheel static balance measuring device of the present invention: a second installation groove is provided on the test platform for placing and installing a level sensor.

[0009] In a preferred embodiment of the rotor static balance measuring device of the present invention, a semicircular table is provided at the bottom of the test platform, and a positioning groove is provided on the semicircular table.

[0010] In a preferred embodiment of the runner static balance measuring device of the present invention, one end of the hydraulic jack is aligned and fixedly connected to the positioning groove.

[0011] In a preferred embodiment of the rotor static balance measuring device of the present invention, a data processing module is further installed at the bottom of the test platform.

[0012] The above technical problem is solved by the following technical solution: the present invention proposes an experimental method, which includes a static balance measuring device for a runner; and after the test platform is built, the test platform is adjusted to the level by a hydraulic jack according to the information feedback from the level sensor; and a standard block is placed on the pressure sensor to detect whether the pressure sensor is normal.

[0013] In a preferred embodiment of the experimental method described in the present invention: the runner is hoisted above the test platform and aligned with the placement space. After the runner is placed, it is determined whether the runner has defects based on the information fed back by the pressure sensor, and the counterweight block is welded at the defective position. After completion, the test is performed again to ensure that the data of each pressure sensor is within the standard range.

[0014] The beneficial effects of the present invention are as follows: before conducting the test, the level of the test platform is checked according to the level sensor, and the hydraulic jack is used to adjust it. After leveling, a number of pressure sensors arranged in a circle are set up, and the impeller is placed on top of them to conduct a static balance test. According to the information fed back by the pressure sensors, if any part has mass eccentricity, the corresponding configuration block can be welded at the corresponding position, which is simple and direct. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0016] Figure 1A schematic diagram of a runner static balance test is shown;

[0017] Figure 2 Shows a schematic diagram of the test platform connection structure;

[0018] Figure 3 Shows a schematic diagram of the placement space layout structure;

[0019] Figure 4 Shows a schematic diagram of the hydraulic jack connection structure;

[0020] Figure 5 A schematic diagram of the bottom structure of the test platform is shown. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0022] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0023] Reference Figure 1 The present embodiment provides a device for measuring the static balance of a runner, including a test platform 1. A plurality of pressure sensors 11 are provided on the test platform 1. The plurality of pressure sensors 11 are arranged around to form a ring, and a placement space 12 into which the bottom of the impeller 2 can enter is formed between the plurality of pressure sensors 11; and a column 13 is provided on the outside of the test platform 1 for preventing the impeller 2 from tipping over.

[0024] The pressure sensor 11 is a sensor that can convert a pressure signal into an electrical signal. The main function of the pressure sensor 11 is to measure the weight of each part of the wheel.

[0025] like Figure 2 As shown, several pressure sensors 11 are arranged in a circular array, and the distance between two adjacent pressure sensors 11 at the inner ring end is close to 0. Through this arrangement, when the impeller 2 contacts it, it can be relatively more accurately known which part has mass eccentricity, which is convenient for the staff to make corresponding adjustments in time.

[0026] like Figure 3As shown, the placement space 12 is a circular area with a center thereof; and a plurality of pressure sensors 11 surround the center of the ring formed, preferably the center position of the test platform 1 is selected as the center of the circle.

[0027] Preferably, four columns 13 are provided. When the test platform 1 is placed on the ground, the columns 13 are fixedly installed on the ground to support the impeller 2 to prevent the impeller 2 from tipping over.

[0028] As an optional embodiment, the test platform 1 is further provided with a level sensor 14 for detecting whether the test platform 1 is level.

[0029] The level sensor 14 is a sensor used to measure the horizontality or tilt angle of an object. The main function of the level sensor 14 here is to feedback whether the platform is horizontal, to prevent the increase of the mass conversion error of each part of the wheel due to the unevenness of the platform, resulting in inaccurate results; specifically, it is used to check whether the table top of the test platform 1 is in a horizontal position before the measurement experiment, to prevent deviations in subsequent experimental results.

[0030] like Figure 2 As shown, the test platform 1 is preferably configured to be rectangular, and two level sensors 14 are provided and are arranged on two adjacent sides of the test platform 1 .

[0031] As an optional embodiment, a hydraulic jack 15 is provided at the bottom of the test platform 1 .

[0032] The hydraulic jacks 15 are preferably provided with 5, such as Figure 5 As shown, the level sensors 14 are arranged around and in the middle of the bottom of the test platform 1. When the level sensor 14 detects that the test platform 1 is unbalanced, the hydraulic jack 15 can be adjusted to make the test platform 1 in a horizontal position.

[0033] As an optional embodiment, a plurality of first installation slots 111 are provided on the test platform 1 . The first installation slots 111 correspond to the pressure sensors 11 one by one, and the first installation slots 111 are used for placing and installing the pressure sensors 11 .

[0034] The first mounting groove 111 can fix the position of the pressure sensor 11 to facilitate on-site alignment installation, and the first mounting groove 111 cooperates with the pressure sensor 11 to reduce measurement data errors caused by installation accuracy errors of the sensor 11 position.

[0035] As an optional embodiment, a second installation groove 141 is provided on the test platform 1 for placing and installing the level sensor 14 .

[0036] The first installation slot 111 and the second installation slot 141 are provided on the test platform 1 so that the first installation slot 111 and the second installation slot 141 can be accurately positioned and installed and can be fixed by bolts.

[0037] As an optional embodiment, a semicircular platform 16 is provided at the bottom of the test platform 1 , and a positioning groove 161 is provided on the semicircular platform 16 .

[0038] When installing the hydraulic jack 15, align the head of the hydraulic jack 15 with the positioning groove 161 below the semicircle and use bolts to connect the test platform 1 from the upper part of the platform; the main function of the hydraulic jack 15 is to support the weight of the runner 2 and adjust the levelness of the platform.

[0039] As an optional embodiment, one end of the hydraulic jack 15 is aligned and fixedly connected to the positioning groove 161 .

[0040] As an optional embodiment, a data processing module 17 is further installed at the bottom of the test platform 1 .

[0041] The data module 17 can be fixedly connected to the test platform 1 by bolts.

[0042] The pressure sensor 11 and the level sensor 14 feedback the detected information, which can be transmitted to the computer for display and processing through the data processing module 17. This technology has been well documented and will not be elaborated on in detail.

[0043] This embodiment also provides an experimental method, which includes building the test platform 1, installing all components in place, adjusting the level of the test platform 1 through the hydraulic jack 15 according to the information feedback from the level sensor 14, and automatically adjusting the level through computer control commands; then using a standard block (a copper block with a weight of 1 kg is used in the experiment and is wiped clean before use) to place the pressure sensor 11 at any position, and using a computer to check whether the displayed data is accurate and whether the pressure sensor 11 is normal.

[0044] As an optional embodiment, the runner 2 is hoisted above the test platform 1 and aligned with the placement space 12, and the surrounding columns 13 are well protected to prevent the runner 2 from suddenly tilting and falling, causing personal injury or equipment damage; when the bottom of the runner 2 is placed in the placement space 12 and the columns 13 are able to support the runner 2, there needs to be a circle on the runner 2 that can contact the pressure sensor 11 for measurement feedback.

[0045] After the runner 2 is placed, the information fed back by the pressure sensor 11 is used to determine whether the runner 2 has defects, and the required counterweight mass and position are displayed. The counterweight block is welded to the corresponding position, and the surrounding columns 13 are used to stabilize the runner 2. The welding operation can then be carried out directly on the runner 2. After cleaning, the test is carried out again until the data is within the standard range. Each pressure sensor 11 reflects the information of different positions on the runner 2. There can be very small data deviations between each other, but they need to be within the preset specified range.

[0046] Specifically, after receiving the information fed back by the level sensor 14, an instruction is issued to the hydraulic jack 15 to adjust the platform level and receive the information from the pressure sensor 11, and the static balance formula is used to calculate which part needs counterweight and how much mass, and then the information is fed back to the computer. Through this device, a static balance test can be carried out on site on the runner 2, so that the static balance of the runner 2 can be tested after the defects are handled on site, avoiding the construction period of transporting the runner 2 to the equipment processing plant, and using sensors to record data, which can be directly exported after computer processing, making it more convenient to conduct on-site tests and subsequent processing.

[0047] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A rotor static balance measuring device, characterized in that: include, A test platform (1), wherein the test platform (1) is provided with a plurality of pressure sensors (11), the plurality of pressure sensors (11) are arranged around to form a ring, and a placement space (12) is formed between the plurality of pressure sensors (11) into which the bottom of the impeller (2) can enter; and A column (13) is provided on the outside of the test platform (1) for preventing the impeller (2) from tipping over.

2. The rotor static balance measuring device according to claim 1, characterized in that: The test platform (1) is also provided with a level sensor (14) for detecting whether the test platform (1) is level.

3. The rotor static balance measuring device according to claim 2, characterized in that: A hydraulic jack (15) is provided at the bottom of the test platform (1).

4. The rotor static balance measuring device according to claim 1, characterized in that: The test platform (1) is provided with a plurality of first installation slots (111), each of the first installation slots (111) corresponding to the pressure sensors (11), and the first installation slots (111) are used for placing and installing the pressure sensors (11).

5. The rotor static balance measuring device according to claim 2, characterized in that: The test platform (1) is provided with a second installation groove (141) for placing and installing a level sensor (14).

6. The rotor static balance measuring device according to claim 3, characterized in that: A semicircular platform (16) is provided at the bottom of the test platform (1), and a positioning groove (161) is provided on the semicircular platform (16).

7. The rotor static balance measuring device according to claim 6, characterized in that: One end of the hydraulic jack (15) is aligned and fixedly connected to the positioning groove (161).

8. The rotor static balance measuring device according to claim 1, characterized in that: A data processing module (17) is also installed at the bottom of the test platform (1).

9. An experimental method, characterized in that: The device comprises the static balance measuring device of a runner according to any one of claims 1 to 8; and After the test platform (1) is built, the test platform (1) is adjusted to a level by a hydraulic jack (15) according to information fed back by the level sensor (14); and, A standard block is placed on the pressure sensor (11) to detect whether the pressure sensor (11) is normal.

10. The experimental method according to claim 9, characterized in that: The runner (2) is hoisted above the test platform (1) and aligned with the placement space (12). After the runner (2) is placed, it is determined whether the runner (2) has defects based on the information fed back by the pressure sensor (11), and a counterweight is welded at the defective position. After completion, the test is performed again to ensure that the data of each pressure sensor (11) is within the standard range.

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