Performance test device for oil head of shaft tubular turbine unit of hydropower station

Abstract

The invention relates to the field of hydraulic machinery, and discloses a performance test device for an oil head of a hydropower station shaft tubular unit. The device comprises a bearing support, a mandrel, a transmission flange, a main shaft, a front bearing, a rear bearing, a coupler, a power device and a power device support. The performance testing device is connected with the main shaft through the coupler, and the transmission flange is fixed at the end of the main shaft through bolts and connected with an outer pipe of an oil head of a tested product. And the mandrel is connected to the center of the transmission flange and is connected with a piston of an oil head of a tested product. The power device is a variable frequency motor and a speed reducer and can provide stable and controllable rotating power. According to the invention, the problem that the oil head cannot be accurately tested due to the fact that the real working state cannot be simulated can be effectively solved, so that the dynamic oil leakage quantity and adjustment performance test of the oil head can be completed in a factory, and accurate test data can be provided.

Description

Technical Field

[0001] The invention relates to the field of hydraulic machinery, in particular to an oil receiver performance test device for an axial flow variable pitch water turbine generator set and a cross-flow water turbine generator set. Background Art

[0002] In a hydropower station, the oil receiver is an important component of the blade operation of the axial-flow variable-pitch turbine generator set and the cross-flow turbine generator set. The stability and reliability of its performance are directly related to the safe and stable operation and regulation performance of the unit. The outer tube of the oil receiver is connected to the main shaft of the turbine and rotates together. The oil distribution chamber of the oil receiver remains floating on the outer tube and connected to the external pipeline and does not rotate. The special structure and working mode make the performance test of the oil receiver under dynamic rotation particularly complicated and difficult. Usually, after the oil receiver is installed in the factory, the traditional test device cannot simulate the actual working state, so only the action test is simulated, resulting in the inability to accurately test the oil leakage and regulation performance of the oil receiver under dynamic conditions. Summary of the invention

[0003] In order to solve the problems existing in the current oil receiver test, it is necessary to simulate the actual operating state of the oil receiver. The present invention provides an oil receiver performance test device capable of realizing dynamic rotation. The technical solution is as follows:

[0004] The present invention is composed of a bearing support, a core shaft, a transmission flange, a main shaft, a front bearing, a rear bearing, a coupling, a power unit, and a power unit bracket. The bearing support is used to support and fix the key components of the device. The bearing support and the power unit bracket are placed on a base platform at the same height. The power unit is used to provide rotational power and is fixed to the power unit bracket by bolts. The main shaft is used to transmit rotational power and passes through the center hole of the front bearing. At the same time, the main shaft passes through the center hole of the rear bearing. The front bearing and the rear bearing are fixed to the bearing support by bolts to support the main shaft. The power unit and the main shaft are connected together by a coupling. The transmission flange is fixed to the end of the main shaft by bolts and connected to the outer tube of the oil receiver of the tested product. The core shaft is connected to the center of the transmission flange and connected to the piston of the oil receiver of the tested product.

[0005] In the above-mentioned performance test device of the oil receiver of the shaft-throughflow unit of the hydropower station, the power device is used to provide rotational power, is fixed to the power device bracket by bolts, and is connected to the connecting key of the main shaft through a coupling to drive the main shaft to rotate.

[0006] In the above-mentioned performance test device for the oil receiver of the shaft-through flow unit of the hydropower station, the transmission flange is a hollow boss with an edge structure as a whole, and is designed from the center to the outside as a first threaded hole and a first light hole, which are distributed in a stepped manner. The first threaded hole is connected to the thread of the core shaft, and the first light hole cooperates with the first cylinder of the main shaft to ensure the coaxiality of the connection between the main shaft and the transmission flange. The second threaded hole group is arranged on the plane on the step, and the second light hole group is arranged on the plane under the step. The second threaded hole group is connected to the third light hole group of the main shaft by bolts. The design of the transmission flange enables it to simulate the rotation of the main shaft of the turbine, thereby driving the outer tube of the oil receiver of the tested product to rotate, and realizing the performance test of the oil receiver of the tested product in a rotating state.

[0007] In the performance test device of the oil receiver of the shaft-through flow unit of the above-mentioned hydropower station, the core shaft is a stepped structure, with threads arranged on one side and a fourth light hole group evenly distributed on the other side. The fourth light hole group is connected to the piston of the oil receiver of the tested product with bolts to transmit necessary movement and power during the test.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The present invention can perform dynamic rotation test on the oil receiver of the tested product, can more realistically simulate the state of the oil receiver in actual work, and provide more accurate test results.

[0010] 2. The present invention can timely discover and improve the defects and problems of the oil receiver of the tested product during testing, thereby improving product quality and reliability.

[0011] 3. The present invention can reduce the failure rate of the oil receiver of the tested product in actual engineering applications, and reduce the downtime and maintenance costs of the hydropower station caused by the oil receiver failure.

[0012] 4. The present invention can promote innovation and development in the oil receiver performance testing technology in the hydropower industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the structure of a performance test device for an oil receiver of an axial-throughflow unit in a hydropower station.

[0014] Figure 2 It is a schematic diagram of the transmission flange structure.

[0015] Figure 3 This is a schematic diagram of the main axis structure.

[0016] Figure 4 It is a schematic diagram of the core shaft structure.

[0017] Markings in the figure: 1-bearing support, 2-core shaft, 3-transmission flange, 4-main shaft, 5-front bearing, 6-rear bearing, 7-coupling, 8-power unit, 9-power unit bracket, 10-second optical hole group, 11-second threaded hole group, 12-first threaded hole, 13-first optical hole, 14-third optical hole group, 15-first cylinder, 16-connecting key, 17-fourth optical hole group, 18-thread. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "first", "second", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only a simplified description for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] like Figure 1As shown, a performance test device for a shaft-through flow unit oil receiver of a hydropower station is composed of a bearing support 1, a core shaft 2, a transmission flange 3, a main shaft 4, a front bearing 5, a rear bearing 6, a coupling 7, a power unit 8, and a power unit bracket 9. The bearing support 1 and the power unit bracket 2 are placed on a base platform at the same height, the power unit 8 is fixed to the power unit bracket 9 by bolts, the main shaft 4 passes through the center hole of the bearing 5, and the main shaft 4 passes through the center hole of the rear bearing 6, the front bearing 5 and the rear bearing 6 are fixed to the bearing support 1 by bolts, the power unit 8 and the main shaft 4 are connected together by the coupling 7, the transmission flange 3 is fixed to the end of the main shaft 4 by bolts, and the core shaft 2 is connected to the center of the transmission flange 3. When the performance test device for the shaft-through flow unit oil receiver of a hydropower station performs a performance test on the tested product, the specific implementation steps are as follows: the bearing support 1 and the power unit bracket 9 are placed on a base platform at the same height and fixed with bolts. The main shaft 4 passes through the front bearing 5 and the rear bearing 6, and the front bearing 5 and the rear bearing 6 are fixed to the bearing support by bolts. Connect the power unit 8 to the main shaft 4 through the coupling 7. Fix the transmission flange 3 to the end of the main shaft 4 with bolts, and connect the core shaft 2 to the center of the transmission flange 3. Connect the outer tube of the oil receiver of the tested product to the transmission flange 3, and connect the piston of the oil receiver to the core shaft 2. Start the power unit 8, and provide stable and controllable rotational power through the frequency conversion motor and reducer to rotate the main shaft 4, transmission flange 3, and core shaft 2, thereby driving the outer tube and piston of the oil receiver to rotate. Observe and record the working performance of the oil receiver in the rotating state, including oil leakage and adjustment performance. Realize the performance test of the oil receiver in the dynamic rotation state, and provide strong support for the quality control and technological innovation of the oil receiver of the shaft-throughflow unit of the hydropower station.

[0021] like Figure 2 As shown, the material selected for the transmission flange 3 has sufficient strength and rigidity to withstand the torque and axial force during the rotation process. The transmission flange 3 is designed with a second light hole group 10 that matches the outer tube of the oil receiver and is fixed to the outer tube of the oil receiver by bolts. The second threaded hole group 11 is connected to the third light hole group 14 at the end of the main shaft 4 by bolts. The connection holes are evenly distributed. At the same time, the first light hole cooperates with the first cylinder 15 of the main shaft 4 to ensure the coaxiality, reliability and stability of the connection.

[0022] like Figure 3 As shown, the spindle 4 is a stepped structure, made of wear-resistant materials, and still maintains good mechanical properties under long-term high-speed rotation. The surface roughness of the spindle 4 is controlled within a certain range, and the surface should be polished after processing to reduce friction and wear, improve transmission efficiency and service life. A third light hole group 14 evenly distributed for connection is designed at one end of the spindle 4, which is used to connect the transmission flange 3 and the first cylinder 15 to ensure the coaxiality of the connection. A connecting key 16 connected to the coupling 7 is designed at the other end.

[0023] like Figure 4 As shown, the material of the mandrel 2 has high strength, corrosion resistance, and good fatigue resistance. The length and diameter of the mandrel 2 need to be determined according to the specific requirements of the position of the oil receiver piston of the tested product. One end of the mandrel 2 is connected to the first threaded hole 12 of the transmission flange 3 through the thread 18, and the other end is connected to the piston of the oil receiver of the tested product through the fourth light hole group 17.

[0024] The present invention is suitable for the oil receiver performance test of axial-flow variable-pitch turbine generator sets and cross-flow turbine generator sets. Based on a deep understanding of the deficiencies in the prior art and an accurate grasp of industry needs, it effectively solves the problems existing in the current oil receiver performance test, significantly improves the test accuracy and reliability of the oil receiver, provides a strong guarantee for the safe and stable operation of the axial cross-flow units of the hydropower station, and also provides a strong technical support for the performance evaluation and optimization of the axial cross-flow units of the hydropower station.

[0025] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A performance test device for an oil receiver of a shaft-throughflow unit of a hydropower station, characterized by: The invention comprises a bearing support (1), a core shaft (2), a transmission flange (3), a main shaft (4), a front bearing (5), a rear bearing (6), a coupling (7), a power unit (8), and a power unit bracket (9). The bearing support (1) and the power unit bracket (9) are placed on a base platform at the same height. The power unit (8) is fixed to the power unit bracket (9) by bolts. The main shaft (4) passes through the center hole of the front bearing (5) and the main shaft (4) passes through the center hole of the rear bearing (6). The front bearing (5) and the rear bearing (6) are fixed to the bearing support (1) by bolts. The power unit (8) and the main shaft (4) are connected together by the coupling (7). The transmission flange (3) is fixed to the end of the main shaft (4) by bolts. The core shaft (2) is fixed to the center of the transmission flange (3) by threads. The transmission flange (3) is connected to the outer tube of the oil receiver of the tested product. The core shaft (2) is connected to the piston of the oil receiver of the tested product.

2. The performance test device for the oil receiver of the axial-throughflow unit of a hydropower station according to claim 1 is characterized by: The power device (8) provides rotational power, is fixed to the power device bracket (9) by bolts, and is connected to the connecting key (16) of the main shaft (4) through a coupling (7), thereby driving the main shaft (4) to rotate.

3. The performance test device for the oil receiver of the axial-throughflow unit of a hydropower station according to claim 1 is characterized by: The transmission flange (3) is a hollow boss with an edge structure as a whole, and is designed from the center to the outside as a first threaded hole (12) and a first light hole (13), which are distributed in a stepped manner. The first threaded hole (12) is connected to the thread (18) of the core shaft (2), and the first light hole (13) is matched with the first cylinder (15) of the main shaft (4). The second threaded hole group (11) is arranged on the plane on the step and is evenly distributed. The second light hole group (10) is arranged on the plane under the step and is evenly distributed. The second threaded hole group (11) is connected to the third light hole group (14) of the main shaft (4) by bolts.

4. The performance test device for the oil receiver of the axial-throughflow unit of a hydropower station according to claim 1 is characterized by: The core shaft (2) is a stepped structure, with a thread (18) arranged on one side and a uniformly distributed fourth light hole group (17) arranged on the other side, and is connected to the piston of the oil receiver of the tested product by bolts through the fourth light hole group (17).

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