A test method and sealing fixture for air leakage rate of double carbon graphite seal assembly

Abstract

The application discloses a kind of double carbon graphite sealing assembly air leakage rate test method and sealing fixture, including positioning ring;Positioning seat is installed in the center position of base;Sealing barrel is installed on the circumferential position of base;Support ring is installed above sealing barrel;The top of positioning seat is equipped with mandrel;Mandrel is used to cooperate with double carbon graphite ring;Positioning ring is installed in the center position on support ring, and positioning ring is used to cooperate with the rear installation side of double carbon graphite sealing assembly;Support barrel is installed on the circumferential position on support ring;Support barrel is equipped with sealing cover on the top;Sealing barrel cooperates with base, support ring and forms first sealed cavity;Support barrel cooperates with sealing cover, support ring and forms second sealed cavity;Pipe joint is installed on sealing barrel and sealing cover;Air guide pipe is installed on the side wall of support barrel;Air guide pipe is connected with the pipe joint of gas supply structure, and the pipe joint of gas supply structure is used to introduce and drain test import airflow to the middle of double carbon graphite ring.

Description

Technical Field

[0001] This invention belongs to the field of performance testing technology, specifically to a test method and sealing fixture for the air leakage rate of a dual carbon graphite sealing assembly. Background Technology

[0002] The main sealing structure of a certain type of aero-engine is a carbon graphite sealing assembly. The assembly characteristics of the carbon graphite sealing assembly are as follows: carbon graphite seals are brittle and easily damaged parts. When they are damaged by external hard particles or contaminants, the surface of the parts is easily scratched. Carbon graphite seals must be assembled in sets and in a clockwise order. When replacing carbon graphite seals, they must be replaced as a set. Parts of different set numbers must not be mixed. After each set of carbon graphite seals is reassembled into a sealing assembly, an air leakage rate test must be performed.

[0003] Air leakage rate testing is a standard for comprehensive evaluation of the assembly quality of carbon graphite sealing components. However, due to the assembly characteristics of carbon graphite seals, the assembly and disassembly of carbon graphite sealing components are difficult during the air leakage rate test. Repeated disassembly and rework due to failure to pass the test can easily lead to damage and scrapping of carbon graphite parts and scratches on carbon graphite sealing seats, which seriously affects work efficiency and restricts production progress. Furthermore, the air leakage rate test in the existing technology can only meet the air leakage rate inspection of graphite sealing components on one side. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a test method and sealing fixture for the air leakage rate of a dual carbon graphite sealing assembly. This method solves the problem that the leakage on both sides of the air leakage rate of the dual carbon graphite sealing assembly cannot be detected simultaneously in the prior art. This invention can improve work efficiency, ensure product quality, and reduce production costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly includes a positioning ring, a support ring, a sealing barrel, a base, a sealing cover, a support barrel, a mandrel, and a positioning seat.

[0007] The positioning seat is installed at the center of the base; the sealing barrel is installed on the circumferential position of the base; the support ring is installed above the sealing barrel; a mandrel is installed on the top of the positioning seat; the mandrel is used to cooperate with the double carbon graphite ring.

[0008] The positioning ring is installed at the center of the support ring and is used to mate with the rear mounting edge of the dual carbon graphite sealing assembly; the support barrel is installed at the circumferential position on the support ring; a sealing cap is installed on the top of the support barrel;

[0009] The sealing barrel, together with the base and the support ring, forms the first sealing cavity;

[0010] The support barrel, together with the sealing cover and the support ring, forms a second sealed cavity;

[0011] The sealing barrel and sealing cover are equipped with pipe interfaces; the side wall of the support barrel is equipped with a gas guide pipe; the gas guide pipe is connected to the pipe connector of the gas supply structure, and the pipe connector of the gas supply structure is used to guide the test inlet gas flow to the middle of the double carbon graphite ring.

[0012] Preferably, the top of the positioning ring is provided with a first screw, which passes through the through hole of the dual carbon graphite sealing assembly and is fixed to the positioning ring.

[0013] Preferably, a first screw is provided at the bottom of the positioning ring, and the first screw passes through the support ring and is fixedly connected to the positioning ring.

[0014] Preferably, a through hole is provided at the center of the positioning seat and the mandrel, and a second screw is installed inside the through hole.

[0015] Preferably, the nozzle and the air duct are connected by a rubber hose.

[0016] Preferably, a handle is provided at the top of the mandrel.

[0017] Preferably, the number of pipe interfaces on the sealing barrel and sealing cover is two, which are used to install a pressure gauge and a flow meter, respectively.

[0018] Preferably, the connecting contact surfaces between the positioning ring, support ring, sealing barrel, base, sealing cover, support barrel, spindle, and positioning seat are provided with grooves, and rubber rings are provided inside the grooves for sealing.

[0019] A method for testing the air leakage rate of a dual carbon graphite sealing assembly, based on the sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly as described in any one of the above-mentioned methods, includes the following steps.

[0020] Place the dual carbon graphite sealing assembly on the positioning ring and align it with the offset hole;

[0021] Place the mandrel between the positioning seat and the dual carbon graphite sealing assembly;

[0022] Install and secure the sealing cap onto the support bucket;

[0023] Install a pressure gauge and a flow meter on the pipe interface of the base and the sealing cover;

[0024] During the test, connect the air source of the test apparatus to the air delivery pipe and check the outlet air pressure using a pressure gauge;

[0025] After the outlet air pressure stabilizes, read the test data and complete the air leakage rate test of the dual carbon graphite sealing assembly.

[0026] Preferably, before installing the dual carbon graphite sealing assembly, the sealing cap and mandrel are removed, and the sealing fixture cavity is checked for foreign matter.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] This invention provides a sealing fixture for testing the air leakage rate of a dual-cell carbon graphite sealing assembly. By constructing a dual-cavity structure and designing a separate air duct structure, it solves the problem of simultaneously detecting leakage on both sides of the dual-cell carbon graphite sealing assembly. The dual-cavity structure meets the requirement of simultaneous detection of leakage rates on both sides of the dual-cell carbon graphite assembly, reducing the number of tests. The air supply structure supplies air from the middle of the dual-cell carbon graphite assembly, reducing the secondary disassembly, assembly, and testing processes of the graphite sealing assembly, shortening the test cycle. The mandrel assembly and positioning structure of the graphite sealing assembly improves assembly quality and reduces the risk of mandrel wear on the graphite ring. Furthermore, the sealing fixture structure has been optimized, significantly improving assembly efficiency, assembly quality, and the risk of damage to the graphite sealing assembly, while reducing labor burden. The sealing assembly of this invention improves the assembly and disassembly quality and efficiency of carbon graphite sealing assemblies during air leakage rate testing, reduces scrap losses, and increases work efficiency.

[0029] Furthermore, the sealing structure of each component of the sealing clamp not only enhances the sealing effect of the sealing clamp, but also reduces the difficulty of disassembling and assembling the sealing clamp. Attached Figure Description

[0030] Figure 1 This is a perspective view of the dual carbon graphite sealing assembly of the present invention.

[0031] Figure 2 This is a side view of the dual carbon graphite sealing assembly in this invention.

[0032] Figure 3 This is a schematic diagram of the sealing fixture structure for testing the air leakage rate of a dual carbon graphite sealing assembly according to the present invention.

[0033] Figure 4 This is an enlarged schematic diagram of the positioning ring of the sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly according to the present invention;

[0034] Figure 5 This is a schematic diagram of an air leakage rate testing system for a dual carbon graphite sealing assembly according to the present invention.

[0035] In the attached diagram: 1 is the positioning ring; 2 is the first screw; 3 is the support ring; 4 is the sealing barrel; 5 is the base; 6 is the support barrel; 7 is the sealing cover; 8 is the mandrel; 9 is the positioning seat; 10 is the second screw; 11 is the pipe connector; 12 is the rubber hose; 13 is the air guide tube; 14 is the pipe interface. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0037] Example

[0038] This invention provides a sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly. It is used to conduct air leakage rate tests on dual carbon graphite sealing assemblies, while improving the assembly and disassembly quality and efficiency of the carbon graphite sealing assembly during the test, reducing scrap loss, and increasing work efficiency.

[0039] like Figures 1 to 4 A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly includes a positioning ring 1, a support ring 3, a sealing barrel 4, a base 5, a sealing cover 7, a support barrel 6, a mandrel 8, and a positioning seat 9.

[0040] The positioning seat 9 is installed at the center of the base 5; the sealing barrel 4 is installed on the circumferential position of the base 5; the support ring 3 is installed above the sealing barrel 4; the top of the positioning seat 9 is equipped with a mandrel 8; the mandrel 8 is used to cooperate with the double carbon graphite ring.

[0041] The positioning ring 1 is installed at the center of the support ring 3. The positioning ring 1 is used to mate with the rear mounting edge of the dual carbon graphite sealing assembly. The support barrel 6 is installed in the circumferential position on the support ring 3. The top of the support barrel 6 is equipped with a sealing cover 7.

[0042] The positioning ring 1 is fitted with the rear mounting edge of the dual carbon graphite sealing assembly. The top of the positioning ring 1 is provided with a first screw 2. The first screw 2 passes through the through hole of the dual carbon graphite sealing assembly and is fixed on the positioning ring 1. The first screw 2 is used to tighten and fix it.

[0043] A first screw 2 is provided at the bottom of the positioning ring 1. The first screw 2 passes through the support ring 3 and is fixedly connected to the positioning ring 1. The support ring 3 and the positioning ring 1 are fitted with a stop and the first screw 2 is designed to be tightened and fixed for secondary positioning.

[0044] The sealing barrel 4, together with the base 5 and the support ring 3, forms the first sealing cavity.

[0045] The support barrel 6, together with the sealing cover 7 and the support ring 3, forms the second sealing cavity.

[0046] The mandrel 8 mates with a double carbon graphite ring and is connected to the base 5 via a positioning seat 9. Note that the bolt holes are machined together on the mandrel 8 and the positioning seat 9.

[0047] A through hole is provided at the center of the positioning seat 9 and the mandrel 8, and a second screw 10 is installed inside the through hole. A handle is provided at the top of the mandrel 8. The second screw 10 is screwed in / out by threads to ensure that the mandrel falls / rises smoothly during assembly / disassembly, and to avoid damage to the double carbon graphite ring.

[0048] The gas supply structure pipe connector 11, rubber hose 12, and air guide pipe 13 are used to introduce the test inlet airflow, which is directly guided to the middle of the double carbon graphite ring. The gas supply structure pipe connector 11 is located in the middle of the positioning ring 1, and the gas supply structure pipe connector 11 is connected to the middle of the double carbon graphite ring.

[0049] Two pipe interfaces 14 are designed on the sealing barrel 4 and the sealing cover 7 respectively, for pressure gauge assembly and pressure measurement and for airflow outlet.

[0050] Grooves are designed on the mating surfaces of the structural components between positioning ring 1, support ring 3, sealing barrel 4, base 5, sealing cover 7, support barrel 6, spindle 8, and positioning seat 9, and rubber rings are used for sealing to ensure the overall sealing effect of the sealing fixture, while also facilitating the disassembly and inspection of each structural component of the sealing fixture.

[0051] This invention provides a sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly. Designed specifically for the unique structure of the dual carbon graphite sealing assembly, the fixture is tailored to meet the requirements of double-sided testing. The use of a rubber ring seal reduces the difficulty of assembling and disassembling the fixture. The addition of a mandrel guide structure reduces the risk of mandrel assembly. Furthermore, the increased processing requirements for the base and positioning seat, and the combination of the positioning seat and mandrel, ensure the coaxiality of the entire mandrel sealing structure, thereby improving the assembly quality of the graphite sealing assembly and reducing the risk of damage.

[0052] By designing a dual-cavity structure, the requirement for simultaneous detection of leakage rates on both sides of the dual carbon graphite is met, reducing the number of tests. By designing an air supply structure, air is supplied from the middle of the dual carbon graphite, reducing the secondary disassembly, assembly, and testing processes of the graphite sealing assembly and shortening the test cycle. By designing a mandrel assembly and positioning structure for the graphite sealing assembly, the assembly quality is improved and the risk of mandrel wear on the graphite ring is reduced. By designing a sealing structure for each structural component of the sealing fixture, the sealing effect of the sealing fixture is enhanced, and the difficulty of disassembling and assembling the sealing fixture is reduced.

[0053] like Figure 5 As shown, the present invention provides a method for testing the air leakage rate of a dual carbon graphite sealing assembly, comprising the following steps:

[0054] Step 1, Inspection of the sealing fixture: Remove the fixing screws, remove the sealing cover 7 and the mandrel 8, and check the sealing fixture cavity for any foreign objects to ensure it is clean and free of any foreign objects.

[0055] Step 2, Install the dual carbon graphite sealing assembly: Place the dual carbon graphite sealing assembly on the positioning ring 1, align it with the offset hole, and use screw 2 to slowly and steadily bring the dual carbon graphite sealing assembly in so that it is tightly fitted with the positioning ring.

[0056] Step 3, Install the mandrel: Gently place the mandrel 8 between the positioning seat and the dual carbon graphite sealing assembly, and use the screw 10 to slowly and smoothly bring the mandrel 8 in.

[0057] Step 4, Install the sealing cap: Install the sealing cap 7 onto the support barrel 6 and tighten it with screws.

[0058] Step 5, Install pressure gauge / flow meter: Select one port on each of the pipe interfaces 14 of the base 5 and the sealing cover 7 to install the air pressure gauge, and use the other port to connect the flow meter / air outlet.

[0059] Step 6: During the test, connect the air source of the test apparatus to the air pipe 13 and check the outlet air pressure using a pressure gauge.

[0060] Step 7: After the outlet air pressure stabilizes, read the test data, including: temperature, relative humidity, air source pressure reading, air leakage rate of the tester, pressure reading, and air leakage rate.

[0061] The sealing clamp of the present invention can also be used to check the air leakage rate on one side. During the test, only one flow meter interface needs to be blocked with a plug, and the flow meter interface on the other side is directly connected to the atmosphere. The air leakage rate of the tester is the air leakage rate on one side.

[0062] This invention solves the problem of simultaneously detecting leakage on both sides of the air leakage rate of the dual carbon graphite sealing assembly by constructing a dual-cavity structure and designing a separate air venting structure. Furthermore, the structure of the sealing fixture has been optimized, which greatly improves assembly efficiency, enhances assembly quality, reduces the risk of damage to the graphite sealing assembly, and alleviates the workload.

[0063] The above describes a sealing fixture designed for air leakage rate testing of dual carbon graphite sealing assemblies in aero-engines. This fixture is capable of simultaneously detecting leakage from both sides of the dual carbon graphite sealing assembly. It features a simple structure, excellent sealing performance, and wide applicability, enabling simultaneous testing of air leakage rates on both sides of the graphite sealing assembly. It can be extended to test air leakage rates of similar aero-engine graphite sealing assemblies, significantly improving work efficiency.

Claims

1. A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly, characterized in that, Includes positioning ring (1), support ring (3), sealing barrel (4), base (5), sealing cover (7), support barrel (6), mandrel (8), and positioning seat (9); The positioning seat (9) is installed at the center of the base (5); the sealing barrel (4) is installed on the circumferential position of the base (5); the support ring (3) is installed above the sealing barrel (4); a mandrel (8) is installed on the top of the positioning seat (9); the mandrel (8) is used to cooperate with the double carbon graphite ring; The positioning ring (1) is installed at the center position on the support ring (3), and the positioning ring (1) is used to cooperate with the rear mounting edge of the double carbon graphite sealing assembly; the support barrel (6) is installed at the circumferential position on the support ring (3); a sealing cover (7) is installed on the top of the support barrel (6). The sealing barrel (4) cooperates with the base (5) and the support ring (3) to form the first sealing cavity; The support barrel (6), together with the sealing cover (7) and the support ring (3), forms a second sealing cavity; The sealing barrel (4) and sealing cover (7) are equipped with pipe interfaces (14); the side wall of the support barrel (6) is equipped with a gas guide pipe (13); the gas guide pipe (13) is connected to the pipe connector (11) of the gas supply structure, and the pipe connector (11) of the gas supply structure is used to introduce the test inlet airflow and guide it to the middle of the double carbon graphite ring.

2. The air leakage rate test sealing fixture for a dual carbon graphite sealing assembly according to claim 1, characterized in that, The top of the positioning ring (1) is provided with a first screw (2), which passes through the through hole of the double carbon graphite sealing assembly and is fixed on the positioning ring (1).

3. The air leakage rate test sealing fixture for a dual carbon graphite sealing assembly according to claim 1, characterized in that, The bottom of the positioning ring (1) is provided with a first screw (2), which passes through the support ring (3) and is fixedly connected to the positioning ring (1).

4. The air leakage rate test sealing fixture for a dual carbon graphite sealing assembly according to claim 1, characterized in that, A through hole is provided at the center of the positioning seat (9) and the spindle (8), and a second screw (10) is installed inside the through hole.

5. A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly according to claim 1, characterized in that, The nozzle (11) and the air duct (13) are connected by a rubber hose (12).

6. The air leakage rate test sealing fixture for a dual carbon graphite sealing assembly according to claim 1, characterized in that, The top of the spindle (8) is provided with a handle.

7. A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly according to claim 1, characterized in that, The number of pipe interfaces (14) on the sealed barrel (4) and the sealed cover (7) is two, which are used to install pressure gauges and flow meters respectively.

8. A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly according to claim 1, characterized in that, The connecting contact surfaces between the positioning ring (1), support ring (3), sealing barrel (4), base (5), sealing cover (7), support barrel (6), spindle (8), and positioning seat (9) are provided with grooves, and rubber rings are provided inside the grooves for sealing.

9. A method for testing the air leakage rate of a dual carbon graphite sealing assembly, characterized in that, A sealing fixture for testing the air leakage rate of a dual carbon graphite sealing assembly according to any one of claims 1 to 8 includes the following process. Place the dual carbon graphite sealing assembly on the positioning ring (1) and align it with the offset hole; Place the mandrel (8) between the positioning seat and the double carbon graphite sealing assembly; Install and fix the sealing cap (7) on the support bucket (6); Install a pressure gauge and a flow meter on the pipe interface (14) of the sealed barrel (4) and the sealed cover (7); During the test, the gas source of the test apparatus is connected to the gas pipe (13), and the outlet gas pressure is checked by the pressure gauge; After the outlet air pressure stabilizes, read the test data and complete the air leakage rate test of the dual carbon graphite sealing assembly.

10. The method for testing the air leakage rate of a dual carbon graphite sealing assembly according to claim 9, characterized in that, Before installing the dual carbon graphite sealing assembly, remove the sealing cap (7) and mandrel (8) and check the sealing fixture cavity for any foreign matter.

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