A pressure and airtightness test fixture for rectifier support casing and its usage method

Abstract

This invention discloses a pressure and airtightness test fixture for a rectifier support casing and its usage method. The test fixture includes a base plate and a cover plate connected to the upper space of the base plate via Class B equal-length double-ended studs. A first sealing ring and a second sealing ring are respectively fitted on the base plate and the cover plate. Several screw holes are provided on the cover plate. A first pressure plate and a second pressure plate are fixed between the base plate and the cover plate by an arc-shaped bracket and C-type hexagonal head clamping screws. A first sealing gasket and a second sealing gasket are respectively fitted on the first pressure plate and the second pressure plate, and an adapter is connected to the first pressure plate. This fixture enables pressure and airtightness testing of the entire weld seam of a part, solving the prominent problem of slow efficiency in testing weld seams of individual plates, and improving the quality of pressure and airtightness testing and the efficiency of part processing.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure airtightness test fixtures, specifically relating to a pressure airtightness test fixture for a rectifier support casing and its usage method. Background Technology

[0002] Reference Figure 4 and Figure 5 The fairing support casing is mounted on the turbine support of an aero-engine and is a core component of the turbine support. The internal cavity of the fairing support casing contains the flow of lubricating oil and compressed cold gas. It is also one of the load-bearing points of the stationary components of the aero-engine, bearing significant mechanical loads and impacts. The fairing support casing is constructed by welding an inner casing to a support plate, forming numerous cavities. Therefore, rapid pressure and airtightness testing of the weld strength is necessary.

[0003] Chinese invention patent with publication number CN112345170B discloses a fixture and method for testing the air tightness of an aero-engine support casing. It divides multiple cavities into two steps for air tightness testing, namely, testing the S-cavity and the inner cavity of the support plate separately. However, separate testing has the problem of complicated operation process. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to provide a pressure airtightness test fixture for a rectifier support casing and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a pressure airtightness test fixture for a rectifier support casing, comprising a base plate, a cover plate disposed in the upper space of the base plate by means of a Class B equal-length double-ended stud, a first sealing ring and a second sealing ring respectively provided on the base plate and the cover plate, and a plurality of screw holes provided on the cover plate.

[0006] A first pressure plate and a second pressure plate are fixed between the base plate and the cover plate by an arc-shaped bracket and C-type hexagonal head clamping screws. A first sealing gasket and a second sealing gasket are respectively attached to the first pressure plate and the second pressure plate, and an adapter is connected to the first pressure plate.

[0007] Preferably, the upper surface of the base plate is provided with a coaxial stop and a threaded hole for connection with a Class B double-ended stud.

[0008] Preferably, the screw holes on the cover plate are matched with screws, the screws are mounted on the cover plate and connected to the threaded holes on the rear wall of the rectifier support casing.

[0009] Preferably, the first sealing ring is assembled on the base plate to ensure that the base plate is tightly fitted to the front wall plate of the rectifier support casing, and the second sealing ring is set on the side end of the cover plate and assembled on the end face of the oil passage support plate of the rectifier support casing, so that the first pressure plate is tightly fitted to the end face of the oil passage support plate.

[0010] Preferably, the first pressure plate is connected to the adapter and the second sealing ring on both sides, and is fitted to the end face of the support plate by tightening the C-type hexagonal head clamping screw on the bow-shaped frame.

[0011] Preferably, the gasket is assembled between the adapter and the first pressure plate.

[0012] Preferably, the adapter is mounted on the oil passage support plate of the rectifier support casing, the exhaust end is connected to the first pressure plate, and the intake end is connected to high-pressure gas.

[0013] Preferably, the base plate, cover plate, screws, first pressure plate, bow-shaped frame, adapter, and second pressure plate are made of 1Cr18Ni9Ti; the first sealing ring, second sealing ring, first sealing gasket, and second sealing gasket are made of polytetrafluoroethylene; and the gasket is made of T2.

[0014] A method for using a pressure and airtightness test fixture for a rectifier bearing casing, characterized by the following steps:

[0015] Step 1: Loosen the C-type hexagonal head clamping screw and the hexagonal nut on the B-grade equal-length double-ended stud;

[0016] Step 2: Install the rectifier support housing into the test fixture, ensuring that the inner housing stop and the bottom plate stop of the rectifier support housing fit together to ensure coaxiality. Install the cover plate and tighten the screws to ensure a tight fit with the threaded hole of the rear wall plate of the rectifier support housing.

[0017] Step 3: Connect the adapter to high-pressure air and observe the weld seal.

[0018] Preferably, the test sealing of the support plate end face is ensured by tightening the C-type hexagonal head clamping screws on the bow-shaped frame; the test sealing of the front wall plate of the rectifier support casing is ensured by tightening the hexagonal nuts on the B-grade equal-length double-ended studs; the threaded hole sealing of the rear wall plate of the rectifier support casing is ensured by tightening the screws; and an air intake system is formed by the adapter, the first pressure plate, and the first sealing gasket to ensure that high-pressure air enters the sealing cavity of the rectifier support casing, thereby realizing the underwater pressure airtightness inspection of the weld.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. Simple operation: Simply install the base plate, cover plate, first pressure plate, and second pressure plate, tighten the screws, C-type hexagonal head clamping screws, and B-grade equal-length double-ended studs with hexagonal nuts, and introduce high-pressure gas through the adapter. This allows for a comprehensive inspection of the strength of the seven support plates of the rectifier support casing and the weld seams of the inner casing.

[0021] 2. High testing efficiency: The pressure and airtightness test fixture of the rectifier support casing can simultaneously test and process the welds on the inner casing of the support plate, avoiding the inefficiency of checking multiple support plates one by one, and significantly improving the efficiency of parts processing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the pressure and airtightness test fixture for the rectifier support casing of the present invention;

[0024] Figure 2 for Figure 1 AA cross-section view;

[0025] Figure 3 for Figure 1 BB cross-section;

[0026] Figure 4 Schematic diagram of the rectifier support casing in this invention Figure 1 ;

[0027] Figure 5 Schematic diagram of the rectifier support casing in this invention Figure 2 ;

[0028] In the diagram, 1-base plate, 2-first sealing ring, 3-cover plate, 4-screw, 5-second sealing ring, 6-first sealing gasket, 7-first pressure plate, 8-arched bracket, 9-gasket, 10-adapter, 11-second sealing gasket, 12-second pressure plate, 13-C-type hexagonal head clamping screw, 14-B-grade equal-length double-ended bolt, 15-hexagonal nut, 16-hexagonal flat nut. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0030] Reference Figures 1-3 The rectifier support casing pressure airtightness test fixture of the present invention is mainly composed of a base plate 1, a first sealing ring 2, a cover plate 3, a screw 4, a second sealing ring 5, a first sealing gasket 6, a first pressure plate 7, an arched frame 8, a gasket 9, an adapter 10, a second sealing gasket 11, a second pressure plate 12, a C-type hexagonal head clamping screw 13, a B-grade equal-length double-ended stud 14, a hexagonal nut 15, and a hexagonal flat nut 16.

[0031] The base plate 1 has a first sealing ring 2 and a coaxial stop on its upper surface, and is fastened to the cover plate 3 by a B-grade equal-length double-ended stud 14.

[0032] The first sealing ring 2 is assembled on the base plate 1 to ensure that the base plate 1 is tightly fitted to the front wall of the part.

[0033] Cover plate 3, which has screw holes and is connected to the base plate by Class B equal-length double-ended studs;

[0034] Screw 4, which is assembled on cover plate 3 and connected and sealed with threaded holes on the rear wall of rectifier support casing;

[0035] The second sealing ring 5 is assembled on the end face of the oil passage support plate of the rectifier support casing to ensure the tight fit between the first pressure plate 7 and the end face of the oil passage support plate.

[0036] The first sealing gasket 6 is assembled on the end face of the oil passage support plate of the rectifier support casing to ensure that the first pressure plate 7 is tightly fitted to the end face of the support plate.

[0037] The first pressure plate 7 is assembled on the end face of the oil passage support plate of the rectifier support casing. Its two sides are respectively connected to the adapter 10 and the second sealing ring 5. It is ensured to be tightly fitted to the end face of the support plate by tightening the C-type hexagonal head clamping screw 13 on the bow-shaped frame 8.

[0038] The bow-shaped frame 8 is a force-bearing frame that ensures that the end faces of the seven support plates are tightly fitted with the first pressure plate 7 and the second pressure plate 12.

[0039] Gasket 9, which is assembled between the adapter 10 and the first pressure plate 7 to ensure the tight fit of the adapter 10;

[0040] The adapter 10 is mounted on the oil passage support plate of the rectifier support casing, with its exhaust end connected to the first pressure plate 7 and its inlet end connected to high-pressure gas.

[0041] The second sealing gasket 11, the gasket 2 is assembled on the remaining 6 support plate end faces to ensure tight fit between the pressure plate and the support plate end faces;

[0042] The second pressure plate 12 is assembled on the end face of the remaining 6 support plates and is tightly fitted with the second sealing gasket 11.

[0043] The C-type hexagonal head clamping screw 13 is connected to the first pressure plate 7 and the second pressure plate 12 via the bow-shaped bracket 8. Tightening the C-type hexagonal head clamping screw 13 ensures that the second pressure plate 12, the first pressure plate 7, and the end face of the support plate are in close contact.

[0044] Class B equal-length double-ended studs 14 are assembled between the base plate 1 and the cover plate 3. By screwing on the hexagonal nuts, the base plate 1 and the cover plate 3 are tightly connected, and the base plate 1 is also tightly fitted to the front wall plate of the rectifier support casing to ensure sealing.

[0045] The base plate 1, cover plate 3, screw 13, first pressure plate 7, bow-shaped frame 8, adapter 10, and second pressure plate 12 are made of 1Cr18Ni9Ti. The first sealing ring 2, second sealing ring 5, first sealing gasket 6, and second sealing gasket 11 are made of polytetrafluoroethylene. The gasket 9 is made of T2.

[0046] The test sealing of the support plate end face is ensured by tightening the C-type hexagonal head clamping screw 13 on the bow-shaped frame 8; the test sealing of the front wall plate of the rectifier support casing is ensured by tightening the hexagonal nut on the B-grade equal-length double-ended stud 14; the sealing of the threaded holes on the rear wall plate of the rectifier support casing is ensured by tightening the seven screws; the air intake system is formed by the adapter 10, the first pressure plate 7, and the first sealing gasket 6 to ensure that high-pressure air enters the sealing cavity of the rectifier support casing, thereby realizing the underwater pressure airtightness inspection of the weld.

[0047] The pressure and airtightness test fixture for the rectifier bearing casing employs the aforementioned deformation control device and includes the following steps:

[0048] Step 1: Loosen the hexagonal nuts 15 and 16 on the C-type hexagonal head clamping screw 13 and the B-grade equal-length double-ended stud 14;

[0049] Step 2: Install the rectifier support housing into the test fixture, ensuring that the inner housing stop of the rectifier support housing fits snugly with the stop of the base plate 1 to ensure coaxiality. Install the cover plate 3 and tighten the seven screws to ensure a tight fit between the threaded holes of the rear wall plate of the rectifier support housing;

[0050] Step 3: Connect the adapter to high-pressure air and observe the weld seal.

[0051] Step 4: Disassemble the clamp: Loosen screw 4, C-type hexagonal head clamping screw 13, and hexagonal nut 15 and hexagonal flat nut 16 on B-grade equal length double-ended stud, and remove the part.

[0052] Design and manufacture a pressure and airtightness test fixture for the rectifier support casing to enable pressure and airtightness testing of the entire weld seam of the part, solve the prominent problem of slow efficiency in testing the weld seam of a single plate one by one, and improve the quality of pressure and airtightness testing and the efficiency of part processing.

[0053] The foregoing has provided a detailed description of the rectifier support casing pressure airtightness test fixture and its usage method provided by the present invention. Specific examples have been used to illustrate the structure and working principle of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pressure airtightness test fixture for a rectifier bearing casing, characterized in that: Includes a base plate (1), and a cover plate (3) located in the upper space of the base plate (1) is connected by a Class B equal-length double-headed stud (14). A first sealing ring (2) and a second sealing ring (5) are respectively provided on the base plate (1) and the cover plate (3). Several screw holes are provided on the cover plate (3). A first pressure plate (7) and a second pressure plate (12) are fixed between the base plate (1) and the cover plate (3) by an arc-shaped bracket (8) and a C-type hexagonal head clamping screw (13). A first sealing gasket (6) and a second sealing gasket (11) are respectively attached to the first pressure plate (7) and the second pressure plate (12), and an adapter (10) is connected to the first pressure plate (7). The first sealing ring (2) is assembled on the base plate (1) to ensure that the base plate (1) is tightly fitted with the front wall of the rectifier support casing. The second sealing ring (5) is set at the front end of the cover plate (3) and assembled on the end face of the oil passage support plate of the rectifier support casing, so that the first pressure plate (7) fits tightly with the end face of the oil passage support plate. The two sides of the first pressure plate (7) are connected to the adapter (10) and the second sealing ring (5) respectively, and are fitted with the end face of the support plate by tightening the C-type hexagonal head clamping screw (13) on the bow-shaped frame (8).

2. The rectifier support casing pressure airtightness test fixture according to claim 1, characterized in that: The upper surface of the base plate (1) is provided with a coaxial stop and a threaded hole for connection with a Class B equal-length double-ended stud (14).

3. The rectifier support casing pressure airtightness test fixture according to claim 1, characterized in that: The screw holes on the cover plate (3) are matched with screws (4). The screws (4) are assembled on the cover plate (3) and connected to the threaded holes on the rear wall of the rectifier support casing.

4. The rectifier support casing pressure airtightness test fixture according to claim 1, characterized in that: The gasket (9) is assembled between the adapter (10) and the first pressure plate (7).

5. The rectifier support casing pressure airtightness test fixture according to claim 1, characterized in that: The adapter (10) is mounted on the oil passage support plate of the rectifier support casing. The exhaust end is connected to the first pressure plate (7), and the inlet end is connected to high-pressure gas.

6. The rectifier support casing pressure airtightness test fixture according to claim 1, characterized in that: The base plate (1), cover plate (3), screw (4), first pressure plate (7), bow frame (8), adapter (10), and second pressure plate (12) are made of 1Cr18Ni9Ti; the first sealing ring (2), second sealing ring (5), first sealing gasket (6), and second sealing gasket (11) are made of polytetrafluoroethylene, and the gasket (9) is made of T2.

7. A method of using the rectifier support casing pressure airtightness test fixture according to any one of claims 1-6, characterized in that: Includes the following steps, Step 1: Loosen the hexagonal nut (15) and hexagonal flat nut (16) on the C-type hexagonal head clamping screw (13) and the B-grade equal length double-ended stud (14). Step 2: Install the rectifier support housing into the test fixture, ensuring that the inner housing stop of the rectifier support housing fits with the stop of the base plate (1) to ensure coaxiality, install the cover plate (3), and tighten the screws (4) to ensure tight fit with the threaded hole of the rear wall plate of the rectifier support housing; Step 3: Connect the adapter (10) to high-pressure air and observe the weld sealing performance.

8. The method of using the rectifier support casing pressure airtightness test fixture according to claim 7, characterized in that: The test sealing of the end face of the support plate is ensured by tightening the C-type hexagonal head clamping screw (13) on the bow-shaped frame (8); the test sealing of the front wall plate of the rectifier support casing is ensured by tightening the hexagonal nut on the B-grade equal-length double-ended stud (14); the threaded hole sealing of the rear wall plate of the rectifier support casing is ensured by tightening the screw (4); the air intake system is formed by the adapter (10), the first pressure plate (7), and the first sealing gasket (6) to ensure that high-pressure air enters the sealing cavity of the rectifier support casing and realizes the underwater pressure airtightness inspection of the weld.

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