A measuring fixture for adjusting the clearance of high-pressure valves in aircraft

Abstract

This utility model relates to the field of aircraft maintenance equipment technology, and in particular to a fixture for adjusting and measuring the clearance of a high-pressure valve in an aircraft. The fixture includes a guide sleeve and a fastening screw. The guide sleeve has a threaded first mating hole on its side and a through-hole second mating hole inside for mating with the valve plate shaft of the high-pressure valve. After the fastening screw is screwed into the first mating hole, it tightens against the valve plate shaft, thus fixing the valve plate shaft, the guide sleeve, and the fastening screw together. The guide sleeve has a small end diameter of 28.2 mm and a large end diameter of 47 mm. The transition surface between the small and large ends is a mating surface, with a gap between it and the flow channel body of the high-pressure valve. The large end face of the guide sleeve forms a measurement reference surface, and the axis of the first mating hole intersects perpendicularly with the axis of the second mating hole. This fixture has a simple structure, is easy to operate, and can accurately measure the clearance of a high-pressure valve in an aircraft, improving measurement efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of aircraft maintenance equipment technology, and in particular to a measuring tool for adjusting the clearance of a high-pressure valve in an aircraft. Background Technology

[0002] The high-pressure stage valve is a crucial component of the aircraft engine system. Its function is to control the airflow in the engine's high-pressure stage, playing a key role in the engine's normal operation. During the assembly of the high-pressure stage valve, the alignment of the valve plate is a critical factor in ensuring its proper function, and this alignment is primarily achieved through shims. Therefore, accurately measuring and determining the required shim dimensions is essential for the assembly quality of the high-pressure stage valve.

[0003] Currently, the measurement of clearance in high-pressure valves for aircraft mainly relies on specialized tooling provided by OEMs (Original Equipment Manufacturers). However, these tooling tools often suffer from problems such as long procurement cycles, high costs, and unstable supply, which bring certain difficulties to aircraft maintenance and production.

[0004] Several tooling designs for measuring aircraft valve clearances exist in the prior art. For example, Chinese patent CN211717344U discloses an aircraft valve clearance measuring tooling, which includes a support base, a fixing mechanism, and a locking mechanism. Clearance measurement is achieved using a dial indicator and a pin, and a weight is used to provide stable measuring pressure, effectively solving the problems of inconvenient manual operation and inaccurate pressing pressure. Chinese patent CN108759628B proposes a clearance measuring tooling for an adjustable bleed valve screw assembly in aircraft. This tooling achieves effective centering and clamping of the screw assembly through a base and torsion arm structure, ensuring the accuracy and reliability of clearance measurement.

[0005] However, the tooling designs in the aforementioned existing technologies are mainly aimed at measuring the clearance of general valves or specific types of valves, and do not adequately consider the special structure and measurement requirements of high-pressure valves in aircraft. Especially during the assembly of high-pressure valves, the measurement of the clearance between the valve plate shaft and the flow channel body requires higher accuracy and stability to ensure that the valve plate's alignment meets the requirements. Existing tooling has shortcomings in the setting of the measurement reference plane, the way it mates with the valve plate shaft, and the design of the fixing mechanism, making it difficult to meet the special needs of high-pressure valve clearance adjustment measurement.

[0006] Furthermore, existing tooling is generally complex in structure and has high manufacturing costs, which is not conducive to independent development and application when OEM tooling procurement is difficult. Therefore, there is an urgent need to develop a simple, easy-to-manufacture, and highly accurate tooling for adjusting the clearance of aircraft high-pressure valves, in order to solve the technical problem of measuring the gasket size during the current high-pressure valve assembly process. Utility Model Content

[0007] To address the current difficulties in OEM tooling procurement and the technical challenge of developing an independent gap adjustment measuring tool to measure the shim dimensions required during the assembly of aircraft high-pressure stage valves, this invention provides a gap adjustment measuring tool for aircraft high-pressure stage valves. This tool aims to ensure stable and accurate measurements, ease of manufacturing, low cost, and improved assembly efficiency and quality of aircraft high-pressure stage valves.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A measuring fixture for adjusting the clearance of a high-pressure valve in an aircraft is provided, comprising a guide sleeve and a fastening screw; the guide sleeve has a threaded first mating hole on its side; the guide sleeve has a through hole structure second mating hole inside for mating with the valve plate shaft of the high-pressure valve; the fastening screw is screwed into the first mating hole and then presses against the valve plate shaft, thereby fixing the valve plate shaft, the guide sleeve and the fastening screw together.

[0010] Optionally, the guide sleeve has a small end diameter of 28.2 mm and a large end diameter of 47 mm.

[0011] Optionally, the transition surface of the large and small ends of the guide sleeve is a mating surface, and a gap is provided between the mating surface and the flow channel body of the high-pressure valve.

[0012] Optionally, the large end face of the guide sleeve constitutes a measurement reference surface.

[0013] Optionally, both the guide sleeve and the fastening screw are made of aluminum alloy.

[0014] Optionally, the inner wall of the second mating hole is a smooth surface, which is clearance-fitted with the valve plate shaft.

[0015] Optionally, the axis of the first mating hole intersects perpendicularly with the axis of the second mating hole.

[0016] Optionally, the mating end of the fastening screw has a flat head structure.

[0017] Optionally, the thread of the first mating hole is a fine thread.

[0018] The advantages of this invention are as follows: By designing the structure of the guide sleeve and fastening screw, the valve plate shaft, guide sleeve, and fastening screw are securely connected, ensuring the stability and accuracy of the measurement. The guide sleeve and fastening screw are made of aluminum alloy, resulting in a simple structure, easy manufacturing, and low cost. The large end face of the guide sleeve serves as the measurement reference surface. By manually applying pressure to the valve plate shaft, the shaft and guide sleeve move up and down together, allowing for accurate measurement of the axial displacement of the valve plate shaft, thus obtaining the required shim clearance. This tooling structure meets valve assembly requirements, satisfies manual measurement requirements, and is easy to operate. It effectively improves the assembly efficiency and quality of aircraft high-pressure valves, avoids repetitive work, and enhances market competitiveness. Compared with existing technologies, this invention eliminates the need for OEM tooling procurement, achieving independent development, solving the problem of shim size measurement, ensuring the alignment of the valve plate, and thus guaranteeing the normal functioning of the aircraft high-pressure valve. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the tooling described in this utility model;

[0021] Figure 2 This is a schematic diagram of the guide sleeve structure described in this utility model;

[0022] Figure 3 This is a schematic diagram of the fastening screw structure described in this utility model;

[0023] Figure 4 This is a schematic diagram of the tooling described in this utility model.

[0024] In the figure: 1. Guide sleeve; 101. First mating hole; 102. Second mating hole; 103. Small end; 104. Large end; 105. Mating surface; 2. Fastening screw; 3. Valve plate shaft; 4. Flow channel body; 5. Gasket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1:

[0027] like Figures 1-4 As shown, this embodiment provides a measuring fixture for adjusting the clearance of an aircraft high-pressure valve. The measuring fixture includes a guide sleeve 1 and a fastening screw 2.

[0028] The guide sleeve 1 has a threaded first mating hole 101 on its side and a through-hole second mating hole 102 inside. The second mating hole 102 is used to mate with the valve plate shaft 3 of the high-pressure valve. The inner wall of the second mating hole 102 is smooth, forming a clearance fit with the valve plate shaft 3 to ensure that the valve plate shaft 3 can be smoothly inserted and maintain appropriate movement space. The axis of the first mating hole 101 intersects perpendicularly with the axis of the second mating hole 102. This design allows the fastening screw 2 to precisely tighten against the valve plate shaft 3 that passes through the second mating hole 102. The first mating hole 101 uses a fine thread design, which provides more precise adjustment capability and a more stable locking effect.

[0029] After the fastening screw 2 is screwed into the first mating hole 101, it tightens against the valve plate shaft 3, forming a stable fixed relationship between the valve plate shaft 3, the guide sleeve 1, and the fastening screw 2. The mating end of the fastening screw 2 adopts a flat head structure design, which provides a larger contact area, making the contact between the screw and the valve plate shaft 3 more stable and reliable, and avoiding damage to the valve plate shaft 3 during the tightening process. The surface of the fastening screw 2 is provided with anti-slip knurled texture for easy tightening.

[0030] The guide sleeve 1 has a small end 103 with a diameter of 28.2 mm and a large end 104 with a diameter of 47 mm. This size design allows the tooling to precisely mate with the various components of the high-pressure valve. A transition surface is formed between the large and small ends 103 of the guide sleeve 1, which serves as a mating surface 105 and has a gap with the flow channel body 4 of the high-pressure valve. This gap is precisely what needs to be adjusted and measured, and this tooling allows for accurate measurement and adjustment of this critical parameter.

[0031] The large end 104 face of the guide sleeve 1 forms the measurement reference surface. When measuring the gap, this surface is used as the reference point for collecting and calculating various data to ensure the accuracy and consistency of the measurement results.

[0032] Both the guide sleeve 1 and the fastening screw 2 are made of aluminum alloy. Aluminum alloy has the advantages of being lightweight, high-strength, and corrosion-resistant, allowing the tooling to maintain sufficient strength and durability while being lightweight, making it easy for operators to hold and use for extended periods, thus reducing workload. At the same time, aluminum alloy has a moderate coefficient of thermal expansion, making it less affected by temperature during measurement and helping to maintain measurement accuracy.

[0033] During use, firstly, align the second mating hole 102 of the guide sleeve 1 with the valve plate shaft 3 of the high-pressure valve, then place the guide sleeve 1 onto the valve plate shaft 3. Next, rotate the fastening screw 2 to pass it through the first mating hole 101 and tighten it against the valve plate shaft 3. At this point, the valve plate shaft 3, guide sleeve 1, and fastening screw 2 form a fixed relationship. The large end 104 of the guide sleeve 1 serves as a measurement reference surface. The clearance of the high-pressure valve can be adjusted and measured by measuring the gap between the mating surface 105 of the guide sleeve 1 and the flow channel body 4 of the high-pressure valve, thus ensuring the normal operation of the high-pressure valve. During measurement, pressure is manually applied to the valve plate shaft, causing the valve plate shaft 3 and guide sleeve 1 to move up and down together. The axial displacement of the valve plate shaft is measured using the guide sleeve reference surface, thereby obtaining the required shim 5 clearance.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An aircraft high pressure stage valve gap adjustment measurement tool, characterized by, Includes guide sleeves and fastening screws; The guide sleeve has a threaded first mating hole on its side; The guide sleeve has a second mating hole with a through hole structure inside, which is used to mate with the valve plate shaft of the high-pressure valve; After the fastening screw is screwed into the first mating hole, it presses against the door panel shaft, thereby fixing the door panel shaft, the guide sleeve, and the fastening screw together.

2. The measurement tooling of claim 1, wherein: The guide sleeve has a small end diameter of 28.2 mm and a large end diameter of 47 mm.

3. The measurement tooling of claim 2, wherein: The transition surface between the large and small ends of the guide sleeve is a mating surface, and there is a gap between the mating surface and the flow channel body of the high-pressure valve.

4. The measurement tool of claim 1, wherein: The large end face of the guide sleeve constitutes the measurement reference surface.

5. The measurement tool of claim 1, wherein: Both the guide sleeve and the fastening screw are made of aluminum alloy.

6. The measurement tool of claim 1, wherein: The inner wall of the second mating hole is a smooth surface, which is clearance-fitted with the valve plate shaft.

7. The gauge of claim 1 wherein: The axis of the first mating hole intersects the axis of the second mating hole perpendicularly.

8. The gauge of claim 1 wherein: The mating end of the fastening screw has a flat head structure.

9. The gauge of claim 1 wherein: The thread of the first mating hole is a fine thread.

Images