A kind of water turbine unit paddle operation cavity pressure test device

Abstract

The utility model relates to water turbine paddle test device technical field discloses a water turbine unit paddle operation cavity pressure test device, including two operation oil pipes, oil inlet and oil outlet, oil inlet sets up oil pump one, its characterized in that, two operation oil pipes are connected on the electric control valve simultaneously, the electric control valve controls two operation oil pipes from intercommunication and cross intercommunication each other switching. The hydraulic oil of quick switching operation cavity is pushed positively and reversely, shortens the oil injection time, realizes quick pressure test and is convenient to operate.

Description

Technical Field

[0001] This utility model relates to the technical field of turbine blade testing devices, specifically to a pressure resistance testing device for the operating chamber of turbine blades. Background Technology

[0002] Both bulb-type and axial-flow propeller turbine units have a blade section. This section is operated by a hydraulically pressurized blade servo drive chamber, which rotates the blades at the front end of the shaft at a certain angle. During normal operation, the two chambers of the blade servo drive are not connected. A pressure test of the blade servo drive chamber before shipment is necessary to verify that the product meets the technical specifications and is a crucial part of the production process.

[0003] The Chinese academic paper, "Research on Key Technologies for Installation of 200MW Axial-Flow Propeller Turbine in the Datengxia Hydropower Project," authored by Wang Zhihui, describes the turbine runner tests, which mainly include blade operation tests and pressure resistance tests. An oil leakage test is conducted at rated oil pressure between the piston and piston cylinder, with rated pressure oil injected into the opening and closing chambers, the leakage rate not exceeding 1.1 L / min, and the test duration being 10 minutes. Next, a pressure resistance test is performed on the turbine body. The turbine operating frame cavity is filled with turbine oil, and the pressure is increased to 0.5 MPa and maintained for 24 hours using a pressure testing fixture. No oil leakage is observed at the turbine blade seals or flange joints. The blades are operated with pressurized oil to rotate, rotating three times per hour throughout the full stroke. No leakage is allowed within 12 hours under ambient temperatures not lower than 5°C. The turbine servo mechanism should operate smoothly, and the opening and closing oil pressure should not exceed 15% of the rated oil pressure. The turbine operation test requires smooth blade rotation without jamming, and flexible operation of the transmission mechanism.

[0004] like Figure 1 As shown, the current pressure testing device for bulb turbine and axial-flow propeller turbine includes operating oil pipe 1, operating oil pipe 2, four control valves, an oil inlet, and an oil outlet. One end of operating oil pipe 1 and operating oil pipe 2 are connected to the operating chamber, and one end of operating oil pipe 1 and operating oil pipe 2 are connected to each other via the oil inlet. Control valve 1 and control valve 4 are respectively installed on the two operating oil pipes. The middle of the two operating oil pipes is connected to the oil outlet line, on which control valve 2 and control valve 3 are installed. The oil outlet is located between control valve 2 and control valve 3. The test blades need to push forward and backward. Therefore, control valve 2 and control valve 4 are closed, and control valve 1 and control valve 3 are opened. Hydraulic oil enters the operating chamber through operating oil pipe 1 and is squeezed out of operating oil pipe 2. Conversely, control valve 1 and control valve 3 are closed, and control valve 2 and control valve 4 are opened. Hydraulic oil enters the operating chamber through operating oil pipe 2 and is squeezed out of operating oil pipe 1. The test blades are subjected to operational testing and tightness pressure testing.

[0005] Currently, the factory uses a small hydraulic pump station with a single pressure output to operate the relay single chamber in daily tests. When one end of the working chamber of the actuating blade relay is in operation, the return oil at the other end needs to be connected to a separate pipe for return oil. The operating oil pipe one and operating oil pipe two switch between oil inlet and return, and four control valves need to be operated at the same time. It takes a whole day to fill one test device with oil, which greatly lengthens the test cycle. Utility Model Content

[0006] To address the technical problems of long operating chamber pressure test time and inconvenient operation, this utility model provides a pressure test device for the operating chamber of a turbine propeller, comprising two operating oil pipes, an oil inlet, and an oil outlet. The oil inlet is equipped with an oil pump. The device is characterized in that the two operating oil pipes are simultaneously connected to an electrically controlled valve, which controls the two operating oil pipes to switch between self-connection and cross-connection.

[0007] To facilitate the connection of two operating oil pipes, the electrically controlled valve includes an A port, a B port, a P port, and a T port. The A port and the P port are connected to one of the operating oil pipes, and the B port and the T port are connected to the other operating oil pipe.

[0008] To facilitate control interface switching, the electrically controlled valve includes a self-connecting switch and a cross-connecting switch. The self-connecting switch controls the connection between interface A and interface P, and interface B and interface T; the cross-connecting switch controls the connection between interface A and interface T, and interface B and interface P.

[0009] For ease of inspection, a pressure gauge is installed on the operating oil pipe at the oil inlet.

[0010] To facilitate direct switching between oil inlet and outlet, the oil inlet and outlet are directly connected to the oil storage device.

[0011] To protect the entire pipeline equipment, the operating oil pipe is connected to a pressure relief pipeline, and a pressure relief valve is installed on the pressure relief pipeline.

[0012] To facilitate the pressure test of the hub chamber, the oil storage device is connected to the hub oil inlet and hub oil outlet through an oil pipe, and control valves are provided at both the hub oil inlet and hub oil outlet.

[0013] To facilitate the detection of pressure in the hub chamber, an oil pump and a pressure gauge are installed on the oil pipe.

[0014] Preferably, the hub oil inlet and hub oil outlet are connected to two branch pipes, the two branch pipes are connected to the hub operating pipe, and a pressure gauge is provided at the connection point.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model replaces four control valves with a four-port electrically controlled valve. The electrically controlled valve performs two actions of opening and closing the blade operating chamber. Only the opening and closing of the electrically controlled valve needs to be operated to perform the opening and closing stroke of the blade relay, which shortens the oil injection time and saves manpower. It also reduces the risk of misoperation. The one-button operation significantly reduces the risk of oil circuit misconnection and pressure shock caused by incorrect sequence of manual valve opening and closing.

[0017] 2. The structure is simple, and the control and switching of the operating oil pipes are convenient and quick. Using a single electrically controlled valve replaces four independent manual control valves, simplifying the overall structure of the testing device and reducing pipeline connection points and potential leakage points. This improves the device's integration and makes the layout more compact and clear. This not only reduces manufacturing costs but also makes the installation, commissioning, and maintenance of the equipment more convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a traditional operating chamber pressure resistance test device;

[0019] Figure 2 This is a schematic diagram of an embodiment of the pressure resistance test device for the turbine blade operating chamber of this utility model;

[0020] Figure 3 for Figure 2 Enlarged diagram in the image. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] In this utility model, the electrically controlled valve is a finished product purchased directly from Chongqing Shunchang General Electric Appliance Co., Ltd., model number DKG-1.

[0023] The reference numerals in the accompanying drawings of the instruction manual include: operating oil pipe 1, oil inlet 2, oil outlet 3, oil storage device 4, oil pump one 5, electrically controlled valve 6, A interface 7, B interface 8, P interface 9, T interface 10, self-connecting switch 11, cross-connecting switch 12, pressure gauge one 13, oil pipe 14, hub oil inlet 15, hub oil outlet 16, control valve 17, oil pump two 18, pressure gauge two 19, branch pipe 20, pressure gauge three 21, pressure relief pipeline 22, pressure relief valve 23, control valve I, control valve II, control valve III, and control valve IV.

[0024] Example 1

[0025] like Figure 2 and 3As shown, a pressure resistance test device for the operating chamber of a turbine blade includes two operating oil pipes 1, an oil inlet 2, an oil outlet 3, and an oil storage device 4. The oil inlet 2 is equipped with an oil pump 5. The two operating oil pipes 1 are simultaneously connected to an electrically controlled valve 6. The electrically controlled valve 6 controls the two operating oil pipes 1 to switch between self-connection and cross-connection.

[0026] The electrically controlled valve 6 includes an A interface 7, a B interface 8, a P interface 9, and a T interface 10. The A interface 7 and the P interface 9 are connected to one of the operating oil pipes 1, and the B interface 8 and the T interface 10 are connected to the other operating oil pipe 1.

[0027] The electrically controlled valve 6 includes a self-connecting switch 11 and a cross-connecting switch 12. The self-connecting switch 11 controls the connection between interface A 7 and interface P 9, and interface B 8 and interface T 10. The cross-connecting switch 12 controls the connection between interface A 7 and interface T 10, and interface B 8 and interface P 9.

[0028] The oil inlet 2 and the oil outlet 3 are directly connected to the oil storage device 4, and a pressure gauge 13 is installed on the operating oil pipe 1 of the oil inlet 2.

[0029] The operating oil pipe 1 is connected to the pressure relief pipe 22, and the pressure relief pipe 22 is equipped with a pressure relief valve 23.

[0030] When the test blade operating chamber is pushed forward, the electronically controlled valve 6 is controlled to make the two operating oil pipes 1 connect automatically. The A interface 7 is connected to the P interface 9, and the B interface 8 is connected to the T interface 10. The hydraulic oil enters the operating oil pipe 1 through the oil pump and enters the blade operating chamber. Another part of the hydraulic oil in the blade operating chamber is squeezed out through the other operating oil pipe 1, so as to realize the blade opening action.

[0031] Conversely, when the test blade operating chamber is pushed back, the electronically controlled valve 6 is controlled to make the two operating oil pipes 1 cross-connected, the A interface 7 is connected to the T interface 10, and the B interface 8 is connected to the P interface 9. The hydraulic oil enters the operating oil pipe 1 through the oil pump and enters the blade operating chamber, and squeezes out another part of the hydraulic oil in the blade operating chamber through the other operating oil pipe 1, thereby realizing the blade closing action.

[0032] The oil storage device 4 is connected to the hub oil inlet 15 and the hub oil outlet 16 via an oil pipe 14. Both the hub oil inlet 15 and the hub oil outlet 16 are equipped with control valves 17.

[0033] Oil pump 2 18 and pressure gauge 2 19 are installed on the oil pipe 14.

[0034] The hub oil inlet 15 and hub oil outlet 16 are connected to two branch pipes 20, which are connected to the hub operating pipe, and a pressure gauge 21 is provided at the connection.

[0035] A 1.0 cubic meter iron oil tank is used as the oil storage device 4. Two oil pumps are installed on the tank, namely oil pump 5 and oil pump 18, with flow and pressure matching values ​​of 14.5 L / min (16 MPa, 6.3 MPa, 4 MPa) and 42 L / min (0.5 MPa). The motors are 4KW and 1.5KW four-pole motors, and there is an independent operating electrical control box (not shown in the figure) for centralized control of the various oil pumps and electrically controlled valves 6.

[0036] To test the pressure in the hub chamber, simply introduce hydraulic oil through oil pipe 14 and maintain a certain pressure for a period of time to confirm that there is no pressure change and no leakage has occurred.

[0037] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A pressure resistance test device for the operating chamber of a turbine blade, comprising two operating oil pipes, an oil inlet, and an oil outlet, wherein an oil pump is installed at the oil inlet, characterized in that, Both operating oil pipes are simultaneously connected to an electrically controlled valve, which controls the switching between self-connection and cross-connection of the two operating oil pipes.

2. The pressure resistance test device for the operating chamber of the turbine blade as described in claim 1, characterized in that: The electrically controlled valve includes an A port, a B port, a P port, and a T port. The A port and the P port are connected to one of the operating oil pipes, and the B port and the T port are connected to the other operating oil pipe.

3. The pressure resistance test device for the operating chamber of the turbine blade as described in claim 2, characterized in that: The electrically controlled valve includes a self-connecting switch and a cross-connecting switch. The self-connecting switch controls the connection between interface A and interface P, and between interface B and interface T. The cross-connecting switch controls the connection between interface A and interface T, and between interface B and interface P.

4. The pressure resistance test device for the operating chamber of the turbine blade as described in claim 3, characterized in that: A pressure gauge is installed on the operating oil pipe at the oil inlet.

5. The pressure resistance test device for the operating chamber of the turbine blade as described in claim 4, characterized in that: The oil inlet and outlet are directly connected to the oil storage device.

6. The pressure resistance test device for the operating chamber of the turbine blade as described in claim 5, characterized in that: The operating oil pipe is connected to the pressure relief pipeline, and the pressure relief pipeline is equipped with a pressure relief valve.

7. The pressure resistance test device for the operating chamber of the turbine blade as described in claim 6, characterized in that: The oil storage device is connected to the hub oil inlet and hub oil outlet via an oil pipe, and a control valve is provided at both the hub oil inlet and hub oil outlet.

8. The pressure resistance test device for the operating chamber of a turbine blade as described in claim 7, characterized in that: The oil pipe is equipped with an oil pump and a pressure gauge.

9. The pressure resistance test device for the operating chamber of a turbine blade as described in claim 8, characterized in that: The hub oil inlet and hub oil outlet are connected to two branch pipes, which are connected to the hub operating pipe, and a pressure gauge is installed at the connection point.

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