Device and method for detecting leakage amount of sealing structure between rectifier and diffuser

Abstract

The invention relates to a device and method for detecting the leakage amount of a sealing structure between a high-pressure compressor rectifier and a combustion chamber diffuser, and the device comprises a pedestal (1); the cover plate (2) is buckled with the base (1), an airflow cavity (8) is formed between the cover plate (2) and the base (1), and the airflow cavity (8) is used for containing a sealing structure (40); the positioning ring (4) is arranged in the airflow cavity (8), the two ends of the positioning ring (4) abut against the cover plate (2) and the base (1) respectively, the positioning ring (4) is used for limiting the compression amount of the sealing structure (40), the thickness of the positioning ring (4) can be changed, and a communication opening (41) is formed in the side wall of the positioning ring (4); the sealing ring (3) is arranged between the base (1) and the cover plate (2) and located on the radial outer side of the airflow cavity (8); and the first fastening piece (5) is arranged on the radial outer side of the sealing ring (3) and detachably connects the cover plate (2) and the base (1).

Description

Technical Field

[0001] The present disclosure relates to the technical field of aero-engine seal inspection, and particularly to a leakage amount inspection device and method for a sealing structure between a rectifier and a diffuser. Background Art

[0002] In an aero-engine, before the high-temperature and high-pressure air compressed by a high-pressure compressor enters the combustion chamber component, it needs to pass through the tenth-stage rectifier of the high-pressure compressor and then enter the combustion chamber diffuser for pressure expansion and deceleration of the high-temperature and high-pressure air.

[0003] In an aero-engine, the tenth-stage rectifier of the high-pressure compressor and the combustion chamber diffuser are often designed separately. In this way, air leakage will occur between the outlet of the rectifier and the inlet of the diffuser, affecting the engine efficiency and reliability. Therefore, a sealing structure needs to be designed between the outlet of the rectifier and the inlet of the diffuser to ensure the sealing performance during the air flow process. A metal sealing ring is usually used for sealing between the outlet of the rectifier and the inlet of the diffuser. Sometimes, the processed sealing ring has problems with unqualified leakage amount performance, but there is no effective inspection method at present. Summary of the Invention

[0004] The present disclosure provides a leakage amount inspection device and method for a sealing structure between a rectifier and a diffuser, which can conveniently and accurately inspect whether the processed sealing structure meets the leakage amount requirements.

[0005] In the first aspect of the present disclosure, a leakage amount inspection device for a sealing structure between a rectifier and a diffuser is provided. The sealing structure is annular, and the inspection device includes:

[0006] A base;

[0007] A cover plate, which is buckled with the base and forms an air flow chamber therebetween for accommodating the sealing structure;

[0008] A positioning ring, which is arranged in the air flow chamber. The two ends of the positioning ring are respectively abutted against the cover plate and the base for defining the compression amount of the sealing structure. The thickness of the positioning ring is changeable and a communication port is provided on the side wall;

[0009] A sealing ring, which is arranged between the base and the cover plate and is located radially outside the air flow chamber; and

[0010] A first fastener, which is arranged radially outside the sealing ring and detachably connects the cover plate and the base.

[0011] In some embodiments, there are two positioning rings, including a first positioning ring and a second positioning ring. The first positioning ring has a first thickness, the second positioning ring has a second thickness, the first thickness is greater than the second thickness, and the first positioning ring and the second positioning ring can be selectively installed in the air flow chamber.

[0012] In some embodiments, the first thickness is configured as the maximum width of the sealing groove during the actual operation of the sealing structure, and the first thickness is configured as the minimum width of the sealing groove during the actual operation of the sealing structure.

[0013] In some embodiments, a first groove is provided on the surface of the cover plate facing the base, and an air flow chamber is formed between the first groove and the base; and / or

[0014] A second groove is provided on the surface of the cover plate facing the base, and the sealing ring is arranged in the second groove.

[0015] In some embodiments, a plurality of communication ports are arranged at intervals along the axial direction on the side wall of the positioning ring.

[0016] In some embodiments, an air inlet is provided on the base, and an air outlet is provided on the cover plate. Both the air inlet and the air outlet are communicated with the air flow chamber, and the air inlet is located radially between the sealing structure and the sealing ring, and the air outlet is located radially within the area surrounded by the sealing structure.

[0017] In some embodiments, the positioning ring is located radially inside the sealing structure.

[0018] In some embodiments, the air inlet is located radially at a position close to the outer edge of the air flow chamber and outside the sealing structure, and the air outlet is located radially within the area surrounded by the positioning ring.

[0019] In some embodiments, the inspection device further includes two mass flow meters, which are respectively used to detect the air flow quality at the air inlet and the air outlet.

[0020] The second aspect of the present disclosure provides an inspection method for an inspection device for the leakage amount of the sealing structure between the rectifier and the diffuser based on the above embodiments, including:

[0021] Making the positioning ring have a first thickness, setting air flows with maximum and minimum pressure differences on the inner and outer sides of the sealing structure respectively, and measuring the respective leakage conditions under the maximum and minimum pressure differences;

[0022] Making the positioning ring have a second thickness, setting air flows with maximum and minimum pressure differences on the inner and outer sides of the sealing structure respectively, and measuring the respective leakage conditions under the maximum and minimum pressure differences; wherein, the first thickness is greater than the second thickness;

[0023] When the leakage conditions detected in each state all meet the requirements, it is determined that the leakage amount of the sealing structure is qualified.

[0024] In some embodiments, the steps of making the positioning ring have a first thickness and making the positioning ring have a second thickness include:

[0025] Provide two positioning rings, including a first positioning ring and a second positioning ring. The first positioning ring has a first thickness, and the second positioning ring has a second thickness;

[0026] Optionally load the first positioning ring and the positioning ring into the air flow chamber.

[0027] In some embodiments, the step of detecting the leakage condition in each state includes:

[0028] Introduce an air flow with a preset pressure from the air inlet;

[0029] After the air flow pressure at the air inlet is stable, detect the total air flow mass at the air outlet within a preset time through a mass flow meter;

[0030] Divide the total air flow mass by the preset time to obtain the actual leakage rate per unit time of the sealing structure.

[0031] In some embodiments, the step of determining whether the leakage condition meets the requirements includes:

[0032] Determine whether the actual leakage rate per unit time of the sealing structure is less than or equal to the theoretical leakage rate per unit time. If it is less, it is determined that the leakage condition meets the requirements.

[0033] In some embodiments, the step of calculating the theoretical leakage rate per unit time includes:

[0034] According to the effective leakage area of the sealing structure, the pressure difference between the inside and outside, and the air density on the high-pressure side under preset temperature and pressure, calculate the theoretical leakage rate per unit time of the currently designed sealing structure;

[0035] Determine whether the current theoretical leakage rate per unit time is less than the total air flow rate flowing out of the rectifier per unit time multiplied by a preset coefficient. If it is less, it means that the current sealing structure meets the design requirements. Otherwise, the sealing structure needs to be redesigned to make the theoretical leakage rate per unit time meet the design requirements.

[0036] The leakage inspection device for the sealing structure between the rectifier and the diffuser according to the embodiments of the present disclosure. In this embodiment, by setting the positioning ring, when inspecting the leakage rate with the tooling, it can be accurately set to the pre-selected installation gap, that is, the width of the sealing groove, so that the sealing structure is stably maintained at the preset compression amount, facilitating accurate detection of the leakage rate of the sealing structure under this working condition. Moreover, when selecting multiple typical widths of the sealing groove, the compression amount of the sealing structure can be adjusted by changing the thickness of the positioning ring, thereby obtaining the leakage rates under different working conditions, enabling the leakage rate of the sealing structure to meet the pneumatic requirements in most actual working conditions, effectively avoiding the unqualified leakage rate performance of the processed sealing structure, and thus improving the working efficiency and reliability of the engine. Brief Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic diagram of the sealing structure between the rectifier and the diffuser of the present disclosure.

[0039] Figure 2 For Figure 1 the schematic diagram of the sealing structure in

[0040] Figure 3 It is a cross-sectional view of some embodiments of the leakage inspection device for the sealing structure between the rectifier and the diffuser of the present disclosure.

[0041] Figure 4 It is a schematic diagram of the structure of some embodiments of the positioning ring.

[0042] Explanation of the reference numerals

[0043] 1. Base; 2. Cover plate; 21. First groove; 22. Second groove; 3. Sealing ring; 4. Positioning ring; 41. Communication port; 5. First fastener; 6. Air inlet; 7. Air outlet; 8. Air flow chamber; 10. Combustion chamber diffuser; 20. High-pressure compressor rectifier; 30. Second fastener; 40. Sealing structure. Detailed implementation manners

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some embodiments of the present disclosure, rather than all embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present disclosure.

[0045] The technologies, methods and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the specification.

[0046] In the description of the present disclosure, it should be understood that the orientation or positional relationships indicated by the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present disclosure.

[0047] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and therefore should not be construed as limiting the protection scope of the present disclosure.

[0048] As Figure 1 shown, the combustor diffuser 10 and the high-pressure compressor rectifier 20 are designed with a separated structure, and are detachably connected through the second fastener 30 at the inner and outer flanges. For example, the high-pressure compressor rectifier 20 can adopt a ten-stage rectifier. A sealing structure 40 is provided between the inlet of the combustor diffuser 10 and the outlet of the high-pressure compressor rectifier 20 in different radial directions. In the figure, there are two sealing structures 40 with different diameters. The sealing structure 40 is annular to ensure the sealing performance at the gap. Figure 1 It is a cross-sectional view, and the center line is located in the lower area of the illustrated part, and only the structure on one side of the center line is shown.

[0049] As Figure 2 shown, it is an enlarged view of the sealing structure 40. For example, the sealing structure 40 can be a W-shaped or other-shaped metal seal ring, etc. The sealing structure 40 is provided within a suitable width H to ensure its sealing performance. It has a high-pressure side A and a low-pressure side B. Under the action of the air pressure between the high-pressure side A and the low-pressure side B, air leakage will occur in the sealing structure 40. The sealing performance of the sealing structure 40 is directly related to the width H of the sealing groove. If the width H is too large, it will be separated from the sealing structure 40 and lose the sealing performance. If the width H is too small, the extrusion pressure on the sealing structure 40 will be too large, resulting in cracking and damage of the sealing structure 40.

[0050] As Figure 3 shown, the present disclosure provides a leakage inspection device for the sealing structure between the rectifier and the diffuser. In some embodiments, the inspection device includes:

[0051] Base 1;

[0052] Cover plate 2, which is buckled with the base 1 and forms an air flow chamber 8 therebetween. The air flow chamber 8 is used to accommodate the sealing structure 40;

[0053] The positioning ring 4 is arranged in the air flow cavity 8. The two ends of the positioning ring 4 are respectively abutted against the cover plate 2 and the base 1, and are used to limit the compression amount of the sealing structure 40. The thickness of the positioning ring 4 is changeable and a communication port 41 is arranged on the side wall;

[0054] The sealing ring 3 is arranged between the base 1 and the cover plate 2 and is located radially outside the air flow cavity 8; and

[0055] The first fastener 5 is arranged radially outside the sealing ring 3 and detachably connects the cover plate 2 and the base 1.

[0056] Among them, both the base 1 and the cover plate 2 can be in a disc shape and may have the same radial dimension. An air flow cavity 8 can be formed between the base 1 and the cover plate 2 by grooving. The sealing structure 40 is arranged in the air flow cavity 8. The thickness direction of the sealing structure 40 along its own axis is consistent with the superposition direction of the cover plate 2 and the base. The sealing structure 40 has a certain compression amount to ensure the sealing effect. The positioning ring 4 is a rigid structure. Arranged in the air flow cavity, it can limit the compression amount of the sealing structure 40. The thickness of the positioning ring 4 is changeable to adjust the compression amount of the sealing structure 40 according to the actual working conditions. The sealing ring 3 is used to prevent the gas in the air flow cavity 8 from leaking through the gap between the base 1 and the cover plate 2, so as to improve the accuracy of the leakage amount test. By fixing the base 1 and the cover plate 2 with the first fastener 5, a pre-pressure can be provided to the sealing structure 40 and the sealing ring 3. The first fastener 5 can adopt a structure of matching a bolt and a nut.

[0057] Since the sealing structure 40 will experience different temperature and pressure conditions during actual operation, such as cruise, high-temperature takeoff, ground idle speed and other conditions, and the temperature and pressure corresponding to each condition are different, resulting in the continuous change of the sealing groove width H. If, according to the usage requirements of the product, the leakage amount under different conditions is used as the acceptance standard, then when detecting the leakage amount of the metal sealing ring, the air introduced needs to be at the same temperature and pressure as the actual conditions (the highest temperature can reach 720 °C and the pressure difference is 0.5 MPa), which will greatly increase the cost of detecting the leakage amount of the sealing structure 40, and most factories cannot provide such high-temperature and high-pressure air sources. Therefore, a typical sealing groove width H can be selected during inspection.

[0058] In this embodiment, by setting the positioning ring 4, the installation gap, that is, the sealing groove width H, which is pre-selected, can be accurately set during the leakage amount inspection of the tooling, so that the sealing structure 40 is stably maintained at the preset compression amount, in order to conveniently and accurately detect the leakage amount of the sealing structure 40 under this condition. Moreover, when selecting multiple typical sealing groove widths H, the compression amount of the sealing structure 40 can be adjusted by changing the thickness of the positioning ring 4, so as to obtain the leakage amounts under different conditions, so that the leakage amount of the sealing structure 40 can meet the pneumatic requirements under most actual working conditions, effectively avoiding the unqualified leakage amount performance of the processed sealing structure 40, thereby improving the working efficiency and reliability of the engine.

[0059] Moreover, by providing a communication port 41 on the positioning ring 4, the gas introduced into the air flow chamber 8 can still leak out through the sealing structure 40, so as not to block the gas leakage while defining the installation gap.

[0060] In some embodiments, there are two positioning rings 4, which include a first positioning ring and a second positioning ring. The first positioning ring has a first thickness, the second positioning ring has a second thickness, the first thickness is greater than the second thickness, and the first positioning ring and the second positioning ring can be selectively installed in the air flow chamber 8.

[0061] Considering that the width H of the sealing groove of the sealing structure 40 is constantly changing with different working conditions during actual operation, it is difficult to inspect many working conditions one by one. By analyzing and summarizing each working condition, factors with little influence on the leakage amount of the sealing structure 40 are discarded, and only two main factors, namely the width H of the sealing groove and the internal and external pressure difference ΔP (ΔP = high pressure P1 - low pressure P2) of the sealing structure 40 during operation, are retained. Finally, the maximum and minimum values of the width H of the sealing groove are selected for detection. In addition, considering that most factories cannot provide a pressure gas source at a very high temperature, the inspection is carried out at room temperature.

[0062] Specifically, the detection standard for the leakage amount of the sealing structure 40 is customized as follows:

[0063] At room temperature, when the width H of the sealing groove is the largest, measure the leakage amount per unit time under the two cases of the maximum and minimum internal and external pressure differences of the sealing structure 40.

[0064] At room temperature, when the width H of the sealing groove is the smallest, measure the leakage amount per unit time under the two cases of the maximum and minimum internal and external pressure differences of the sealing structure 40.

[0065] This embodiment can simplify the actual complex working conditions of the sealing structure 40, select the maximum and minimum values of the width H of the sealing groove, which not only reduces the inspection difficulty, but also covers all working conditions between the maximum and minimum values, ensuring that the inspection results of the sealing structure 40 can cover the actual situation. After removing the first fastener 5, the positioning ring 4 with different thicknesses can be replaced, which can simplify the structure of the positioning ring 4. Optionally, the positioning ring 4 can also be designed in a form with adjustable thickness, for example, by flipping or pushing and pulling to achieve deformation, so as to switch between the first thickness and the second thickness.

[0066] In some embodiments, the first thickness is configured as the maximum sealing groove width during the actual operation of the sealing structure 40, and the first thickness is configured as the minimum sealing groove width during the actual operation of the sealing structure 40.

[0067] If the leakage amounts meet the requirements at the maximum and minimum values of the width H of the sealing groove, the leakage amounts can also meet the requirements under the working conditions where the width H of the sealing groove is at other values.

[0068] In some embodiments, as Figure 3 shown, a first groove 21 is provided on the surface of the cover plate 2 facing the base 1, and an air flow cavity 8 is formed between the first groove 21 and the base 1. For example, the first groove 21 can be circular. In order to ensure that the cover plate 2 still has sufficient strength after the first groove 21 is provided, the thickness of the cover plate 2 can be made greater than that of the base 1. Optionally, the first groove 21 can also be provided on the surface of the base 1 facing the cover plate 2, or on both the base 1 and the cover plate 2 at the same time.

[0069] In this embodiment, by providing the first groove 21, the air flow cavity 8 can be conveniently formed, and it is easy to determine the installation positions of the positioning ring 4 and the sealing structure 40.

[0070] In some embodiments, a second groove 22 is provided on the surface of the cover plate 2 facing the base 1, and the sealing ring 3 is arranged in the second groove 22. Optionally, the second groove 22 can also be provided on the surface of the base 1 facing the cover plate 2, or on both the base 1 and the cover plate 2 at the same time.

[0071] In this embodiment, by providing the second groove 22, the sealing ring 3 can be positioned to prevent the sealing ring 3 from moving out of place, improve its installation stability, prevent the gas in the air flow cavity 8 from leaking out through the gap between the base 1 and the cover plate 2, and improve the accuracy of leakage detection of the sealing structure 40.

[0072] In some embodiments, as Figure 4 shown, a plurality of communication ports 41 are arranged at intervals along the circumferential direction on the side wall of the positioning ring 4. For example, the communication ports 41 can be round holes, oval holes, polygonal holes, etc., or the communication ports 41 can also be long strip-shaped openings extending along the circumferential direction of the positioning ring 4.

[0073] This embodiment can increase the ventilation effect of the positioning ring 4, reduce the resistance to the leakage detection gas caused by the setting of the positioning ring 4, and thus reduce the influence of the setting of the positioning ring 4 on the detected leakage amount.

[0074] In some embodiments, as Figure 3 shown, an air inlet 6 is provided on the base 1, and an air outlet 7 is provided on the cover plate 2. Both the air inlet 6 and the air outlet 7 are communicated with the air flow cavity 8, and the air inlet 6 is located radially between the sealing structure 40 and the sealing ring 3, and the air outlet 7 is located radially within the area surrounded by the sealing structure 40. Both the air inlet 6 and the air outlet 7 can be connected to air pipes.

[0075] Preferably, one air inlet 6 and one air outlet 7 are provided, and they can be arranged on the same radial line of the base 1 and the cover plate 2.

[0076] After the gas is introduced through the air inlet 6 in this embodiment, the air flow reaches the air flow chamber 8 and will pass through the sealing structure 40 and the positioning ring 4. The air flow leaking through the sealing structure 40 will flow out from the air outlet 7. The air inlet 6 and the air outlet 7 are arranged on both sides of the sealing structure 40 in the radial direction, and the leakage amount of the sealing structure 40 can be measured.

[0077] In some embodiments, the positioning ring 4 is located inside the sealing structure 40 in the radial direction. The positioning ring 4 and the sealing structure 40 are arranged at intervals in the radial direction to form a cavity therebetween, facilitating the air flow leaking from the sealing structure 40 to flow out through the communication port 41 on the positioning ring 4.

[0078] This embodiment can reduce the radial dimensions of the base 1 and the cover plate 2. After the air flow enters through the air inlet 6, it can first flow to the sealing structure 40, enabling the pressure of the introduced gas to more accurately reflect the working pressure difference between the inside and outside of the sealing structure 40 and improving the accuracy of leakage amount detection. Optionally, the positioning ring 4 can also be located outside the sealing structure 40 in the radial direction.

[0079] In some embodiments, the air inlet 6 is located at a position near the outer edge of the air flow chamber 8 in the radial direction and outside the sealing structure 40, and the air outlet 7 is located within the area surrounded by the positioning ring 4 in the radial direction. After the air flow enters through the air inlet 6, it can first leak through the sealing structure 40, and the leaked gas flows out from the air outlet 7 after passing through the communication port 41 on the positioning ring 4. By detecting the air flow quality at the air outlet 7, the leakage amount can be obtained.

[0080] In some embodiments, the inspection device further includes two mass flow meters respectively used to detect the air flow quality at the air inlet 6 and the air outlet 7.

[0081] When detecting the leakage amount, air (about 60 KPa) with a preset pressure is introduced through the air inlet 6. The gas will leak from the sealing surface of the sealing structure 40 to the air outlet 7. When the pressure value at the air inlet 6 is stable, timing starts. The total amount of gas measured at the air outlet 7 within the preset time is equal to the leakage amount of the sealing structure 40. The leakage amount divided by the preset time is equal to the actual leakage amount per unit time. Therefore, by respectively arranging mass flow meters at the air inlet 6 and the air outlet 7, not only can the pressure of the introduced gas be accurately controlled, but also the air flow leakage amount can be measured.

[0082] Secondly, the present disclosure provides an inspection method for the leakage amount of the sealing structure between the rectifier and the diffuser based on the above embodiment. In some embodiments, the inspection method includes:

[0083] Make the positioning ring 4 have a first thickness, set air flows with the maximum pressure difference and the minimum pressure difference on the inside and outside of the sealing structure 40 respectively, and measure the respective leakage conditions under the maximum pressure difference and the minimum pressure difference;

[0084] The positioning ring 4 is made to have a second thickness, and airflows with a maximum pressure difference and a minimum pressure difference are respectively arranged on the inner and outer sides of the sealing structure 40, and the leakage conditions under the maximum pressure difference and the minimum pressure difference are measured; wherein, the first thickness is greater than the second thickness;

[0085] When the leakage conditions detected in each state all meet the requirements, it is determined that the leakage amount of the sealing structure 40 is qualified.

[0086] This embodiment can simplify the actual complex working conditions of the sealing structure 40, select two typical values of the width H of the sealing groove, reduce the inspection difficulty, and if the leakage amount requirements are met under these two typical values, it is considered that the leakage amount can also meet the pneumatic requirements when the width H of the sealing groove is at other values, which can effectively avoid the unqualified leakage amount performance of the processed sealing structure 40, thereby improving the working efficiency and reliability of the engine.

[0087] For example, the first thickness is configured as the maximum sealing groove width during the actual working process of the sealing structure 40, and the first thickness is configured as the minimum sealing groove width during the actual working process of the sealing structure 40. Thus, if the leakage amount meets the requirements under the maximum and minimum values of the width H of the sealing groove, the leakage amount can also meet the requirements under the working conditions where the width H of the sealing groove is at other values.

[0088] In some embodiments, the steps of making the positioning ring 4 have a first thickness and making the positioning ring 4 have a second thickness include:

[0089] Provide two positioning rings 4, including a first positioning ring and a second positioning ring, the first positioning ring has a first thickness, and the second positioning ring has a second thickness;

[0090] Optionally install the first positioning ring and the positioning ring 4 into the air flow chamber 8.

[0091] In this embodiment, after removing the first fastener 5, the positioning ring 4 with different thicknesses can be replaced, which can simplify the structure of the positioning ring 4, and the replacement process is simple and convenient.

[0092] In some embodiments, as Figure 3 shown, the steps of detecting the leakage conditions in each state include:

[0093] Introduce airflows with a preset pressure from the air inlet 6;

[0094] After the air flow pressure at the air inlet 6 is stable, detect the total air flow mass at the air outlet 7 within a preset time through a mass flow meter;

[0095] Divide the total air flow mass by the preset time to obtain the actual leakage amount per unit time of the sealing structure 40.

[0096] Among them, mass flow meters can be respectively arranged at the air inlet 6 and the air outlet 7, which can not only accurately control the pressure of the introduced gas, but also measure the air flow leakage amount, so as to conveniently obtain the actual leakage amount per unit time.

[0097] In some embodiments, the steps of determining whether the leakage situation meets the requirements include:

[0098] Determine whether the actual leakage amount per unit time of the sealing structure 40 is less than or equal to the theoretical leakage amount per unit time. If it is less, it is determined that the leakage situation meets the requirements.

[0099] Among them, the theoretical leakage amount per unit time is the leakage amount that can meet the pneumatic requirements calculated during the design stage of the sealing structure 40, that is, the design threshold of the leakage amount. When the actually obtained leakage amount does not exceed the theoretically designed threshold, it is determined that the leakage amount of the processed sealing structure 40 meets the requirements. If the actual leakage amount per unit time of the sealing structure 40 is greater than the theoretical leakage amount per unit time, it indicates that the processing link does not meet the requirements.

[0100] In some embodiments, the steps of calculating the theoretical leakage amount per unit time include:

[0101] According to the effective leakage area of the sealing structure 40, the pressure difference between the inside and outside, and the air density on the high-pressure side under the preset temperature and pressure, calculate the theoretical leakage amount per unit time of the currently designed sealing structure 40;

[0102] Determine whether the current theoretical leakage amount per unit time is less than the total air flow rate flowing out of the rectifier per unit time multiplied by a preset coefficient. If it is less, it indicates that the current sealing structure 40 meets the design requirements. Otherwise, the sealing structure 40 needs to be redesigned so that the theoretical leakage amount per unit time meets the design requirements.

[0103] Among them, during the design stage of the sealing structure 40, it is necessary to ensure that the designed sealing structure 40 can meet the leakage amount requirements of the pneumatic requirements, so as to ensure the engine efficiency, and at the same time provide an inspection standard for the processing and manufacturing of the sealing structure 40. According to the pneumatic requirements, the leakage amount requirement of the sealing structure 40 should be less than the preset coefficient multiplied by the total air flow rate flowing out of the rectifier per unit time. For example, the preset coefficient is 0.04. The specific calculation formula is as follows:

[0104]

[0105] Among them, w is the leakage amount of the sealing structure 40, with the unit of kg / s, Acd is the effective leakage area, obtained according to experimental experience. For example, when choosing a double W seal ring (a common metal seal ring of this structure), the common value is 5.43X10 -8 , with the unit of m 2, ρ is the air density on the high-pressure side of the sealing structure 40 under certain temperature and pressure, with the unit of kg / m 2 , ΔP is the pressure difference formed by the different pressures on the inner and outer sides of the metal sealing ring, with the unit of Pa.

[0106] In the above formula, the calculation formula of ρ is as follows:

[0107]

[0108] Among them, P is the high-pressure side pressure at the location of the sealing structure 40, with the unit of Pa, and T is the working temperature, with the unit of K.

[0109] W Z is the total air flow rate flowing out of the ten-stage rectifier, with the unit of kg / s. If it can be judged that the influence of the leakage amount on the aerodynamic performance is small and acceptable. At the same time, the theoretical value of w is used as the inspection standard for whether the leakage amount requirement is met after the sealing structure 40 is processed and manufactured.

[0110] This embodiment can calculate the theoretical value of the leakage amount according to the structure and working parameters of the sealing structure 40, and use it as the inspection standard for whether the leakage amount requirement is met after the sealing structure 40 is processed and manufactured, which is convenient for comparing the detected leakage amount with the theoretical value to determine whether the processed sealing structure 40 meets the leakage amount requirement.

[0111] A specific embodiment is given below to illustrate the working principle of the present disclosure, taking the sealing structure 40 as a metal sealing ring as an example for illustration.

[0112] In the sealing structure design stage, it is required that the leakage amount of the metal sealing ring should be less than 0.04% of the total air flow rate. Through the listed formula for precise calculation, it is ensured that the designed metal sealing ring meets the leakage amount requirement, reduces the influence of the leakage amount on the aerodynamic performance, and at the same time provides an inspection standard for the processing and manufacturing of the metal sealing ring.

[0113] To meet the leakage amount requirement during product use, when detecting the leakage amount of the metal sealing ring, the air introduced should be at the same temperature and pressure as the actual working conditions, which will greatly increase the cost of detecting the leakage amount of the metal sealing ring, and most factories cannot provide such high-temperature and high-pressure air sources. Therefore, the present disclosure adopts a simple detection method. When the width H of the sealing groove is the largest, the leakage amount is measured under the two cases of the maximum and minimum pressure differences between the inner and outer sides of the metal sealing ring; when the width H of the sealing groove is the smallest, the leakage amount is measured under the two cases of the maximum and minimum pressure differences between the inner and outer sides of the metal sealing ring. Through this standard, it can be ensured that the leakage amount of the metal sealing ring can meet the aerodynamic requirements under any working conditions during actual operation.

[0114] The present disclosure provides a detection tooling. By means of two positioning rings with different specifications, the thicknesses of which are respectively equal to the maximum value and the minimum value of the width H of the sealing groove, and the positioning rings are circular rings with rectangular communication ports on the side walls, so that the gas leaked from the metal sealing ring can flow out through the communication ports to the air outlet. Gas mass flow meters are installed at both the air inlet and the air outlet. When detecting the leakage amount, air with a required pressure value is introduced from the air inlet, and the gas will leak from the sealing surface of the metal sealing ring to the air outlet. When the inlet pressure value is stable, timing starts. The total amount of gas measured at the air outlet within a preset time is equal to the leakage amount of the metal sealing ring. The leakage amount divided by the preset time is equal to the leakage amount per unit time.

[0115] The above are only exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A leakage inspection device for the seal structure between a rectifier and a diffuser, the seal structure being annular, characterized in that, The inspection device includes: a base (1); a cover plate (2) which is buckled with the base (1) and forms an air flow chamber (8) therebetween, and the air flow chamber (8) is used to accommodate the sealing structure (40); a positioning ring (4) provided in the air flow chamber (8), and two ends of the positioning ring (4) are respectively abutted against the cover plate (2) and the base (1) for defining the compression amount of the sealing structure (40), the thickness of the positioning ring (4) is changeable and a communication port (41) is provided on the side wall; a sealing ring (3) provided between the base (1) and the cover plate (2) and located radially outside the air flow chamber (8); and a first fastener (5) provided radially outside the sealing ring (3) and detachably connecting the cover plate (2) and the base (1).

2. The leakage inspection device for the sealing structure between the rectifier and the diffuser according to claim 1, characterized in that, There are two positioning rings (4), and the two positioning rings (4) include a first positioning ring and a second positioning ring. The first positioning ring has a first thickness, the second positioning ring has a second thickness, the first thickness is greater than the second thickness, and the first positioning ring and the second positioning ring can be selectively installed in the air flow chamber (8).

3. The leakage amount inspection device for the sealing structure between the rectifier and the diffuser according to claim 2, characterized in that, The first thickness is configured as the maximum sealing groove width during the actual working process of the sealing structure (40), and the first thickness is configured as the minimum sealing groove width during the actual working process of the sealing structure (40).

4. The leakage amount inspection device for the sealing structure between the rectifier and the diffuser according to claim 1, wherein a first groove (21) is provided on the surface of the cover plate (2) facing the base (1), and the air flow chamber (8) is formed between the first groove (21) and the base (1); and / or a second groove (22) is provided on the surface of the cover plate (2) facing the base (1), and the sealing ring (3) is provided in the second groove (22).

5. The leakage inspection device for the sealing structure between the rectifier and the diffuser according to claim 1, wherein A plurality of the communication ports (41) are circumferentially and spacedly arranged on the side wall of the positioning ring (4).

6. The leakage inspection device for the sealing structure between the rectifier and the diffuser according to any one of claims 1 to 5, characterized in that, An air inlet (6) is provided on the base (1), and an air outlet (7) is provided on the cover plate (2). The air inlet (6) and the air outlet (7) are both communicated with the air flow chamber (8), and the air inlet (6) is radially located between the sealing structure (40) and the sealing ring (3), and the air outlet (7) is radially located within the area surrounded by the sealing structure (40).

7. The leakage inspection device for the sealing structure between the rectifier and the diffuser according to claim 6, characterized in that, The positioning ring (4) is radially located inside the sealing structure (40).

8. The leakage inspection device for the sealing structure between the rectifier and the diffuser according to claim 7, characterized in that, The air inlet (6) is radially located at a position close to the outer edge of the air flow chamber (8) and outside the sealing structure (40), and the air outlet (7) is radially located within the area surrounded by the positioning ring (4).

9. The leakage inspection device for the sealing structure between the rectifier and the diffuser according to claim 6, characterized in that It further includes two mass flow meters respectively used for detecting the air flow mass at the air inlet (6) and the air outlet (7).

10. A test method for a leakage amount inspection device of the sealing structure between a rectifier and a diffuser according to any one of claims 1 to 9, characterized in that, The inspection method includes: making the positioning ring (4) have a first thickness, setting air flows with a maximum pressure difference and a minimum pressure difference on the inner and outer sides of the sealing structure (40) respectively, and measuring the respective leakage conditions under the maximum pressure difference and the minimum pressure difference; The positioning ring (4) has a second thickness, and airflows with a maximum pressure difference and a minimum pressure difference are respectively arranged on the inner and outer sides of the sealing structure (40), and the leakage conditions at the maximum pressure difference and the minimum pressure difference are measured; wherein, the first thickness is greater than the second thickness; When the leakage conditions detected in each state meet the requirements, it is determined that the leakage rate of the sealing structure (40) is qualified.

11. The inspection method according to claim 10, wherein The steps of making the positioning ring (4) have a first thickness and making the positioning ring (4) have a second thickness include: Providing two positioning rings (4), including a first positioning ring and a second positioning ring, the first positioning ring has a first thickness, and the second positioning ring has a second thickness; Selectively loading the first positioning ring and the positioning ring (4) into the air flow chamber (8).

12. The inspection method according to claim 10, characterized in that, The steps of detecting the leakage conditions in each state include: Introducing an air flow with a preset pressure from the air inlet (6); After the air flow pressure at the air inlet (6) is stable, detecting the total air flow mass at the air outlet (7) within a preset time through a mass flow meter; Dividing the total air flow mass by the preset time to obtain the actual leakage rate per unit time of the sealing structure (40).

13. The inspection method according to claim 11, characterized in that, The steps of judging whether the leakage conditions meet the requirements include: Judging whether the actual leakage rate per unit time of the sealing structure (40) is less than or equal to the theoretical leakage rate per unit time. If it is less, it is determined that the leakage conditions meet the requirements.

14. The inspection method according to claim 13, wherein, The steps of calculating the theoretical leakage rate per unit time include: Calculating the theoretical leakage rate per unit time of the currently designed sealing structure (40) according to the effective leakage area of the sealing structure (40), the pressure difference between the inner and outer sides, and the air density on the high-pressure side under preset temperature and pressure; Judging whether the current theoretical leakage rate per unit time is less than the total air flow rate flowing out of the rectifier per unit time multiplied by a preset coefficient. If it is less, it means that the currently designed sealing structure (40) meets the design requirements. Otherwise, the sealing structure (40) needs to be redesigned so that the theoretical leakage rate per unit time meets the design requirements.

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