Blade cavity dividing flow measuring method

Abstract

According to the method, sealing blocks which are made of oil-resistant rubber and are used in cooperation with all the cavity channels of the blade are adopted, the flow conditions of all the cavity channels of the blade are accurately measured in a cavity-channel-dividing mode, and a basis is provided for the whole machine to select the installed blade. The rigidity of the blade sealing block is good so as to ensure the sealing effect of the sealing block on the part, the leakage phenomenon is avoided in the measurement process, and stable and accurate measurement of the water flow and the air flow is realized. The flow measuring tool body frame structurally comprises a tool bottom plate, a guide sliding block for limiting the sliding track of the sealing plug block, a blade pressing structure and a sealing plug block pressing structure. The same base body frame is used, and water flow measurement can be carried out on parts at different machining stages of the parts and under the conditions of different cavity channels and different water flow outlets through rapid replacement of different sealing plug blocks. The method has the advantage of being capable of being applied to water and gas flow measurement of various cavity-divided blades. And the batch structure design of the water and air flow measuring tool of the multi-cavity hollow blade can be realized.

Description

Technical Field

[0001] The invention relates to the field of tooling structure design and flow rate testing for measuring water and air flow rates of sub-cavities of aircraft engine blades, and in particular to a method for measuring the sub-cavity flow rates of blades. Background Art

[0002] With the continuous development of aero-engine blade manufacturing technology, the application of split-chamber blades has gradually increased, the distribution of blade cavities has become increasingly complex, the structure of blade air film holes has been continuously updated, the number has been increasing, the angles have become more complex, and processing and testing have become more difficult, and the demand for blade cooling capacity has also become increasingly high. In order to accurately grasp the cooling capacity of each blade cavity and the specific conditions of air film cooling, water and air flow detection methods are often used to test the flow rate of the blade to detect the cooling capacity. Summary of the invention

[0003] The purpose of the present invention is to carry out effective and accurate flow measurement, measure the water and air flow in each cavity of the blade respectively, accurately grasp the internal cooling condition of the blade, verify the casting condition of the inner cavity of the blade and the punching condition of the air film hole, provide a basis for selecting the installed blades, and specially provide a blade sub-cavity flow measurement method.

[0004] The present invention provides a method for measuring the flow rate of blades by cavity: a sealing block made of oil-resistant rubber material used in conjunction with each cavity of the blade is used to accurately measure the flow rate of each cavity of the blade, thereby providing a basis for selecting blades for installation in the whole machine.

[0005] The blade sealing block has good rigidity to ensure the sealing effect of the sealing block on the parts. There is no leakage during the measurement process, and stable and accurate measurement of water and air flow is achieved.

[0006] The structure of the main frame of the flow measurement tooling is a tooling bottom plate, a guide sliding block for limiting the sliding track of the sealing block, a blade clamping structure and a sealing block clamping structure.

[0007] By using the same base frame and quickly replacing different sealing blocks, the water flow rate of the parts can be measured separately at different processing stages of the parts, in different cavities and with different water flow outlets.

[0008] In order to prevent the tooling from rusting due to long-term use, the tooling bottom plate is made of 2Cr12NiMoWV stainless steel. 2Cr12NiMoWV stainless steel has high strength and good toughness. Compared with traditional 45# steel, it has excellent corrosion resistance and high temperature resistance. It can be used for long-term flow testing without causing water quality deterioration, thereby increasing the service life of the equipment. 2Cr12NiMoWV has high strength and good toughness, and it is guaranteed not to deform during long-term use, which ensures the reliability of measurement and increases the service life of the fixture. The water and gas flow measurements were carried out on both sides of the mounting plate, and the guide sliders of the mounting plate sealing block made of 2Cr12NiMoWV stainless steel were installed on the bottom plate. The blades are clamped with a hinged clamp, and the single-sided sealing block is clamped with two sets of supports and an MC02-S2 clamp to prevent the sealing block from being clamped eccentrically.

[0009] Sealing block in flow measurement tooling:

[0010] The sealing block is used to seal the mounting plate of the guide vane to ensure that all surfaces of the guide vane are sealed completely and there will be no leakage when measuring water and air flow.

[0011] The industry currently uses all-rubber block for sealing. When the hardness of the rubber block is high, the sealing block cannot fit with the blade surface. When the hardness of the sealing block is low, the deformation is large, water and air leak, and the measurement results are inaccurate. Different from the previous all-rubber sealing block, the present invention uses a stainless steel substrate to increase the overall rigidity of the sealing block to prevent leakage caused by deformation of the sealing block during the compression process. For the parts in contact with the parts, the surface pressing method is used outside the stainless steel substrate of the sealing block to increase the rubber contact surface with a certain toughness, ensure the fit of the compression surface, and avoid crushing the blades.

[0012] The thickness and hardness of the profile glue play a vital role in sealing. Five groups of sealing blocks with colloid thickness of 1mm, 2mm, 3mm, 4mm and 5mm are designed respectively. Each group of sealing blocks is designed with oil-resistant rubber with Shore hardness of 35-40, 40-45 and 45-50. There are 15 sealing blocks in total. After water and air flow measurement tests, the sealing blocks with colloid thickness of 3mm and Shore hardness of 40-45 have the best sealing effect. Therefore, the profile glue thickness of the sealing block is 3mm and the Shore hardness of the colloid is 40-45.

[0013] Design of guide slide in flow measurement tooling

[0014] Water and gas flow measurement uses water inlet on both sides of the mounting plate, and guide sliders of 2Cr12NiMoWV stainless steel mounting plate sealing blocks are installed on the bottom plate. The inside of the guide slider is flat and smooth, with a roughness of no more than Ra0.8, and the internal corners are cleaned. If the length of the guide slider is too long, the fixture will be too large. After testing, when the length of the guide slider is equivalent to the length of the blade, it can be ensured that the slider will not deviate and get stuck when pressed, and the fixture will not be too large.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The test fixture adopts a structure that matches the main frame with the rubber sealing block. A special rubber sealing block can be designed according to the size of the parts and the distribution of the cavity to achieve effective sealing of the guide vanes, and then accurately measure the water and air flow of the blades. This flow measurement tooling can be used to measure the water and air flow of various types of cavity blades. Through this tooling structure, the batch structure design of the water and air flow measurement tooling for multi-cavity hollow blades can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the main frame of the flow measurement tooling;

[0019] Figure 2 Schematic diagram of the blade water and air flow measurement channel. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, and sizes illustrated in the drawings of the specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship, or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0021] Example 1

[0022] like Figure 1 shown.

[0023] 1 is a base plate; 2 is a positioning block for the part, with 1 piece on the upper mounting plate and 1 piece on the lower mounting plate, for a total of 2 pieces; 3 and 4 are guide slide blocks; 5 and 6 are push blocks used in conjunction with the sealing block, which slide in the guide slide block to push the sealing block to contact and press the part to achieve sealing; 7 is a clamping support for the part, 8 is a MC02-S2 clamp, 7 and 8 are 2 pieces on each side of the upper and lower mounting plates, for a total of 4 pieces. The clamping position of the clamp should be adjusted according to the water and air flow test results of the part to ultimately ensure that the part is clamped without leakage or water seepage; 9 is a clamping hinge pressure plate for the part.

[0024] 1. Design and use of the main frame of the tooling: The main frame of the tooling should be able to ensure accurate positioning of parts and reliable clamping, and the material should be able to prevent rust. The sealing block can move smoothly in the guide slider, and the clamping is simple and reliable.

[0025] Select the upper and lower mounting plate planes of the part as the reference for axial positioning, select the outer circle of the upper mounting plate of the part as the reference for radial positioning, and select the groove of the upper mounting plate of the part as the reference for angular positioning to ensure that the part can be positioned accurately and stably. A guide slider is fixed on the bottom plate, and there is a push block in the guide slider that is used in conjunction with the sealing block. The contact surface between the guide slider and the push block should be flat and smooth, with a roughness of no more than Ra0.8, and the internal corners should be root-cleaned. The blades are clamped with a hinged clamp, and the single-sided sealing block is clamped with two sets of supports and an MC02-S2 clamp to prevent the sealing block from being clamped eccentrically.

[0026] 2. Design and use of tooling sealing block: The sealing block is made of stainless steel as the base material, and then the profile is pressed. First, the matching surface of the stainless steel base and the upper and lower mounting plates of the blades is processed. During processing, a rubber thickness of 2 to 3 mm must be reserved. After the stainless steel base is made, when the profile is pressed, the blades with qualified sizes of the upper and lower mounting plates are selected as the mold, and after pouring and cooling, the tooling sealing block is obtained.

[0027] 3. Design of chamber measurement in tooling: Different "sealing blocks" are designed for different measuring chambers, and each measuring chamber corresponds to a dedicated "sealing block".

[0028] Matters not covered by the present invention are known technologies.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for measuring flow rate of a blade cavity, characterized in that: The oil-resistant rubber sealing block used in conjunction with each cavity of the blade is used to accurately measure the flow of each cavity of the blade, providing a basis for selecting and installing blades for the whole machine; The blade sealing block has good rigidity to ensure the sealing effect of the sealing block on the parts. There is no leakage during the measurement process, and the water and air flow can be measured stably and accurately. The structure of the main frame of the flow measurement tooling is a tooling bottom plate, a guide slide block for limiting the sliding track of the sealing block, a blade clamping structure and a sealing block clamping structure; Using the same base frame, through the rapid replacement of different sealing blocks, the water flow of parts can be measured separately in different processing stages, different cavities and different water flow outlets; the tooling bottom plate is made of 2Cr12NiMoWV stainless steel; water and gas flow measurement uses water inlet on both sides of the mounting plate, and the guide sliders of the 2Cr12NiMoWV stainless steel mounting plate sealing block are installed on the bottom plate; the blades are pressed by hinged pressing plates, and the single-sided sealing block is pressed by two sets of supports with MC02-S2 pressers to prevent the sealing block from being pressed eccentrically; Sealing block in flow measurement tooling: The sealing block is used to seal the installation plate of the guide vane to ensure that all surfaces of the guide vane are sealed completely and there will be no leakage when measuring water and air flow; A stainless steel base is used to increase the rigidity of the sealing block as a whole, preventing leakage caused by deformation of the sealing block during the compression process; in the parts in contact with the parts, a profiled rubber is applied outside the stainless steel base of the sealing block to increase the contact surface of rubber with a certain toughness, ensuring the fit of the compression profile and avoiding damage to the blades; Thickness and hardness of profiled rubber: 5 groups of sealing blocks with thickness of 1mm, 2mm, 3mm, 4mm and 5mm. Each group of sealing blocks is designed with oil-resistant rubber with Shore hardness of 35-40, 40-45 and 45-50, totaling 15 sealing blocks.

2. The method for measuring flow rate of a blade by cavity according to claim 1, characterized in that: The thickness of the colloid is preferably 3 mm, and the Shore hardness is 40-45 for the sealing block.

3. The method for measuring flow rate of a blade by cavity according to claim 1, characterized in that: The structure of the guide slider in the flow measurement tooling: Water and gas flow measurement uses water inlet on both sides of the mounting plate, and the guide sliders of the mounting plate sealing block made of 2Cr12NiMoWV stainless steel are installed on the bottom plate. The inside of the guide slider is flat and smooth, with a roughness of no more than Ra0.8, and the internal corners are root-cleaned.

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