Flow fixture for turbine guide vane internal flow testing

Abstract

This invention provides a flow fixture for internal flow testing of turbine guide vanes. The turbine guide vane has a shaped rim plate. The flow fixture includes a base, a clamping device for pressing the shaped rim plate, and a shaped die assembly that seamlessly fits the inlet end face of the turbine guide vane. The shaped die used in this fixture is designed for the complex rim plate structure of the blade. It employs a full three-dimensional blade structure contact molding method, and is formed after high-speed and uniform mixing of the molding material. It exhibits excellent compressibility, resilience, and sealing properties, and seamlessly fits and presses against the inlet end face of the blade, resulting in excellent airtightness. By changing the clamping section and the shaped die, it can be quickly adapted for testing different blade profiles or cavity configurations, significantly improving economic efficiency.

Description

Technical Field

[0001] This invention belongs to the field of testing technology for aero-engine components, specifically relating to a flow fixture for testing the internal flow of turbine guide vanes. Background Technology

[0002] During the production and use of aero-engine turbine guide vanes, internal flow tests are required to obtain the internal flow rate of the vanes under different pressure ratios. This allows for real-time monitoring of the internal cooling airflow capacity of the vanes during the testing and modification process, providing a reference for the analysis of the vane cooling effect.

[0003] Currently, guide vane flow tests in the domestic aviation industry use traditional, non-universal flow test fixtures, with structures such as... Figure 3 As shown, the fixture includes a pressure block, a pressure plate, a base, a sealing gasket, and clamping bolts. During testing, the test blade is placed within the space formed by the pressure block, pressure plate, and base. Sealing gaskets are attached to the surfaces of the pressure block, pressure plate, and base that contact the blade's mounting edge. Pressure is applied to the pressure block and pressure plate using the clamping bolts to achieve a sealing effect. After long-term use, several defects have been identified in this fixture that urgently require improvement:

[0004] 1) Due to the irregular shape of the blade and the flange, there will be a gap between the pressure block and the base. To ensure a seal, multiple people are required to work together, repeatedly disassemble and assemble, apply sealant, and constantly tighten and adjust the tightening direction, which wastes a lot of time and effort.

[0005] 2) The fixtures have poor versatility. When the blade profile and edge plate structure are changed, they cannot be quickly replaced. New fixtures that match the changes need to be manufactured, which is costly.

[0006] 3) It is not easy to check for leaks and observe the air output of the air film pores.

[0007] 4) When facing blades with complex irregular rim plate structures, the sealing gasket of this clamp cannot fit tightly with the irregular rim plate of the blade, resulting in poor air tightness.

[0008] 5) Traditional clamps are made of carbon steel, which makes them heavy and prone to rust, making them difficult to handle, maintain and store.

[0009] Therefore, there is an urgent need to find a fixture that can adapt to complex edge plate structures to improve testing efficiency. Summary of the Invention

[0010] To address the aforementioned problems, the present invention aims to provide a flow fixture for testing the internal flow rate of turbine guide vanes. By improving the tightness of the fit with the blade's shaped edge plate, quickly replacing the clamping section and shaped mold head that fit with the blade's inlet end face, and using a clamping device to unidirectionally displace and press the moving slider, the invention reduces manpower, material, and financial costs and improves testing efficiency.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a flow fixture for testing the internal flow rate of a turbine guide vane, wherein the turbine guide vane is provided with a shaped flange, and the flow fixture includes a base, a clamping device for pressing the shaped flange, and a shaped mold assembly that seamlessly fits the inlet end face of the turbine guide vane.

[0012] The irregularly shaped mold head assembly includes two irregularly shaped mold heads that seamlessly fit the inlet end face of the turbine guide vane. The two irregularly shaped mold heads are detachably and replaceably connected to two mold head mounting blocks located at both ends of the base. The two mold head mounting blocks can move towards each other to clamp the turbine guide vane between the two irregularly shaped mold heads, or fix one mold head mounting block and move the other mold head mounting block closer to the fixed mold head mounting block to clamp the turbine guide vane. The movement of the mold head mounting blocks is pushed by a clamping device.

[0013] The flow fixture for testing the internal flow of turbine guide vanes provided by the present invention also has the following feature: the base is hollow, and the clamping device is fixed on the base by a support.

[0014] The flow fixture for testing the internal flow of turbine guide vanes provided by this invention also has the following feature: the irregularly shaped mold head is mounted on the mold head mounting block via a clamping section, and the clamping section is provided with a mounting groove for assembling the irregularly shaped mold head.

[0015] The flow fixture for testing the internal flow of turbine guide vanes provided by the present invention also has the following features: the clamping section is fastened to the mold head mounting block by an internal hexagon bolt; a gasket is provided at the connection between the clamping section and the mold head mounting block; and the clamping section is provided with a groove for installing the gasket.

[0016] The flow clamp for testing the internal flow of turbine guide vanes provided by this invention also has the feature that the gasket is made of nitrile rubber.

[0017] The flow fixture for testing the internal flow of turbine guide vanes provided by this invention also has the feature that the base is provided with a groove for limiting the movement direction of the mold mounting block.

[0018] The flow fixture for testing the internal flow of turbine guide vanes provided by this invention also has the following feature: a cover plate is connected to the side of the mold mounting block where the irregular mold head is not fixed; an air intake adapter for connecting the air intake pipe is welded to the inlet position of the cover plate; and the hollow cavities of the cover plate, the air intake adapter, and the mold mounting block form a connected air intake chamber.

[0019] The flow fixture for testing the internal flow of turbine guide vanes provided by this invention also has the following feature: a probe holder for mounting a probe is welded on the intake adapter, and the probe is used to measure the total temperature and total pressure of the gas in the intake chamber.

[0020] The flow fixture for testing the internal flow of turbine guide vanes provided by the present invention also has the feature that the flow fixture is provided with one or more handles.

[0021] Beneficial effects

[0022] The flow fixture for testing the internal flow rate of turbine guide vanes described in this invention has been successfully applied in the internal flow rate test of aero-engine guide vanes, demonstrating excellent sealing performance and good agreement between the tested and designed flow rate data. In practical use, it offers the following significant advantages:

[0023] 1. The irregularly shaped mold head is designed for the complex blade edge plate structure. It adopts a full three-dimensional blade structure contact mold opening method. After the mold opening material is mixed at high speed and uniformly, it is molded and formed. It has excellent compressibility, resilience and sealing performance. It fits and presses seamlessly with the blade inlet end face, and has excellent air tightness performance. By changing the clamping section and the irregularly shaped mold head, it can be quickly changed for different blade shapes or cavity tests, which can greatly improve economic efficiency.

[0024] 2. The clamping device is used to move the slider in one direction. The pre-clamping, quick positioning and installation and secondary feeding and clamping of the cover are convenient for two or fewer operators to quickly position and clamp the cover.

[0025] 3. The fixture base is hollow, which makes it easy to check for leaks and quickly troubleshoot during the test.

[0026] 4. The base, support, and slide are made of lightweight aluminum alloy, which significantly reduces the weight of the fixture and processing costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a top view of the flow fixture for testing the internal flow rate of a turbine guide vane provided in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Front view of section AA;

[0030] Figure 3 This is a flow test fixture in the existing technology. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0032] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0033] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0035] like Figure 1-2 As shown, this embodiment provides a flow fixture for testing the internal flow rate of a turbine guide vane. The turbine guide vane is provided with a shaped rim plate. The flow fixture is characterized by comprising a base 1, a clamping device 3 for pressing the shaped rim plate, and a shaped mold assembly that seamlessly fits the inlet end face of the turbine guide vane.

[0036] The irregularly shaped mold head assembly includes two irregularly shaped mold heads 12 that are seamlessly fitted to the inlet end face of the turbine guide vane. The two irregularly shaped mold heads 12 are detachably and replaceably connected to two mold head mounting blocks located at both ends of the base. The two mold head mounting blocks can move towards each other to clamp the turbine guide vane between the two irregularly shaped mold heads, or fix one mold head mounting block and move the other mold head mounting block closer to the fixed mold head mounting block to clamp the turbine guide vane. The movement of the mold head mounting blocks is pushed by the clamping device 3.

[0037] exist Figure 1-2 In the embodiment shown, the rightmost of the two die head mounting blocks is the fixed die head mounting block 5, and the leftmost is the movable die head mounting block 9. During operation, the fixed die head mounting block 5 remains stationary, while the movable die head mounting block 9 moves to the right under the push of the clamping device to clamp the turbine guide vane.

[0038] In some embodiments, the base 1 is hollow, and the clamping device 3 is fixed to the base 1 by a support 2.

[0039] In some embodiments, the irregularly shaped mold head is mounted on the mold head mounting block via a clamping section 11, which is provided with a mounting groove for assembling the irregularly shaped mold head.

[0040] In some embodiments, the clamping section 11 is fastened to the mold head mounting block by an internal hex bolt, and a gasket 10 is provided at the connection between the clamping section 11 and the mold head mounting block. The clamping section 11 is provided with a groove for installing the gasket.

[0041] In some embodiments, the gasket is made of nitrile rubber.

[0042] In some embodiments, the base 1 is provided with a groove 4 for limiting the movement direction of the mold head mounting block.

[0043] In some embodiments, a cover plate 8 is connected to the side of the mold head mounting block that does not fix the irregular mold head. An air intake adapter 6 for connecting an air intake pipe is welded to the inlet position of the cover plate 8. The cover plate 8, the air intake adapter 6 and the hollow cavity of the mold head mounting block form a connected air intake chamber.

[0044] In some embodiments, the intake adapter 6 is welded with a probe holder 7 for mounting a probe, which is used to measure the total temperature and total pressure of the gas in the intake chamber.

[0045] In some embodiments, the flow clamp is further provided with one or more handles 13.

[0046] During operation, the fixture features a straight-through flow channel, allowing airflow to flow in a straight line from the fixture inlet to the outlet, thus eliminating pressure loss caused by changes in airflow direction. Air enters from both ends, and the shaped die is custom-made to fit the inlet face of the test blade. The shaped die surface fits tightly against the inlet face of the test blade, resulting in excellent airtightness.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A flow fixture for testing the internal flow rate of a turbine guide vane, wherein the turbine guide vane is provided with a shaped flange, characterized in that, The flow clamp includes a base, a clamping device for pressing the shaped flange, and a shaped die assembly that seamlessly fits the inlet end face of the turbine guide vane. The irregularly shaped die assembly includes two irregularly shaped dies that seamlessly fit the inlet end face of the turbine guide vane. These two shaped dies are detachably and replaceably connected to two die mounting blocks located at both ends of the base. The two die mounting blocks can move towards each other to clamp the turbine guide vane between the two shaped dies, or fix one die mounting block and move the other closer to the fixed die mounting block to clamp the turbine guide vane. The movement of the die mounting blocks is driven by a clamping device. The irregularly shaped die head is mounted on the die head mounting block via a clamping section, and the clamping section is provided with a mounting groove for assembling the irregularly shaped die head. The clamping section is fastened to the mold head mounting block by hexagon socket bolts. A gasket is provided at the connection between the clamping section and the mold head mounting block, and the clamping section is provided with a groove for installing the gasket.

2. The flow fixture for testing the internal flow rate of turbine guide vanes according to claim 1, characterized in that, The base is hollow, and the clamping device is fixed to the base by a support.

3. The flow fixture for testing the internal flow rate of turbine guide vanes according to claim 1, characterized in that, The gasket is made of nitrile rubber.

4. The flow fixture for testing the internal flow rate of a turbine guide vane according to claim 1, characterized in that, The base is provided with a groove for limiting the movement direction of the mold head mounting block.

5. The flow fixture for testing the internal flow rate of a turbine guide vane according to claim 1, characterized in that, A cover plate is connected to the side of the mold head mounting block where the irregular mold head is not fixed. An air intake adapter for connecting an air intake pipe is welded to the inlet position of the cover plate. The cover plate, the air intake adapter, and the hollow cavity of the mold head mounting block form a connected air intake chamber.

6. The flow fixture for testing the internal flow rate of a turbine guide vane according to claim 5, characterized in that, The intake adapter is welded with a probe holder for mounting a probe, which is used to measure the total temperature and total pressure of the gas in the intake chamber.

7. The flow fixture for testing the internal flow rate of a turbine guide vane according to claim 1, characterized in that, The flow clamp is also equipped with one or more handles.

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