A method and device for checking air tightness of compressor disc assembly

Abstract

A method and device for checking the air tightness of a compressor disk assembly, wherein an inner hole sealing assembly is installed in a stepped hole of a bushing and abuts against a stepped surface on the left side of the stepped hole, so that the inner hole sealing assembly and the inner wall of the stepped hole are sealed; a conical surface sealing assembly is installed at the right end of the compressor disk assembly and seals the conical surface F at the right end of the compressor disk; a plate sealing assembly is installed on a radial plate of the compressor disk and seals the inclined hole of the compressor disk; the inner hole sealing assembly, the conical surface sealing assembly, the radial plate sealing assembly and the compressor disk assembly together form a pressure chamber; air or nitrogen is injected into the pressure chamber to detect the air tightness between the end of the bushing extension end on the compressor disk assembly and the compressor disk. The air tightness checking device provided by the present invention effectively overcomes the problem of difficulty in air tightness detection caused by the presence of a deep central through hole on the compressor disk assembly and a stepped hole, and the compressor disk having an inclined hole P, a conical surface F and other special-shaped structures.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengine manufacturing, and in particular to a method and a device for checking the air tightness of a compressor disc assembly. Background Art

[0002] At present, according to the design requirements of modern aircraft engines, it is necessary to perform air tightness inspection on specific parts of compressor disc parts, and the air tightness inspection fixture must be effective. If the air tightness of the compressor disc assembly cannot be effectively checked, it will seriously affect the performance of the engine.

[0003] like Figure 1 The figure shows the assembly drawing of the third-stage compressor disc assembly, which consists of a compressor disc and a bushing. The design requires checking the air tightness between the end of the bushing extension and the compressor disc, that is, the air tightness at V in the figure. Since the central through hole of the part is deep and is a stepped hole, and the compressor disc has special-shaped structures such as an inclined hole P and a conical surface F, and the inclined hole P is connected to the stepped hole inside the bushing, it is difficult to design an air tightness device. Traditional methods cannot effectively check the air tightness at V. In the field of aero-engine manufacturing technology, there are many tools and methods for air tightness detection in the prior art.

[0004] For example, the patent with application number CN201710498491.0 discloses an air tightness test tool for auxiliary sealing rubber rings in aviation graphite seals. The air tightness test tool includes a simulated static ring, a simulated inner ring, a simulated outer ring, an inner ring fixture and an outer ring fixture. The simulated static ring includes a coaxial and integrally arranged inner ring sleeve and an outer ring boss, and the outer ring boss is fixedly arranged at the front end of the inner ring sleeve; the outer diameter and inner diameter of the simulated inner ring are the same as the outer diameter and inner diameter of the inner ring sleeve, the outer diameter of the simulated outer ring is the same as the outer diameter of the outer ring boss, the annular outer wall of the simulated inner ring and the annular inner wall of the simulated outer ring are gap-matched, and the simulated outer ring and the simulated inner ring are sleeved to form a combination with the same shape as the simulated static ring; the setting of the simulated static ring can test the air tightness of the tool itself; the setting of the simulated inner ring and the simulated outer ring can perform air tightness detection on the auxiliary sealing rubber ring placed therebetween.

[0005] For another example, the patent with application number CN202011140309.2 discloses an air tightness detection fixture and detection method for aircraft engine support casings. The detection fixture is mainly composed of a lower end face sealing assembly, an upper end face sealing assembly, a support plate air intake assembly, a clamping shoulder long bolt, and a transfer tube sealing assembly. During the air tightness detection, the sealing of the S cavity and the inner cavity of the transfer tube is realized by sealing the lower end face sealing assembly, the upper end face sealing assembly, the clamping shoulder long bolt, and the transfer tube sealing assembly, and then the air tightness of the inner cavity of the support plate is detected by ventilation of the support plate one by one. This patent realizes the air tightness detection of the aircraft engine support casing through the ingenious design of the airtight fixture and the arrangement of the detection sequence, ensuring that the air tightness of all welds is detected, improving the detection efficiency, and avoiding missed detection.

[0006] Although the above existing patents disclose some parts and components air tightness detection tools in the process of aircraft engine manufacturing, they are not applicable to Figure 1 The third-stage compressor disc assembly shown, therefore, needs to provide a compressor disc assembly air tightness inspection method and device for inspecting the air tightness of the third-stage compressor disc assembly. Summary of the invention

[0007] The main purpose of the present invention is to provide a method and device for checking the air tightness of a compressor disc assembly, aiming to solve the above technical problems.

[0008] To achieve the above-mentioned purpose, on the one hand, the present invention provides a compressor disc assembly air tightness inspection device, comprising:

[0009] An inner hole sealing assembly is used to be arranged in the stepped hole of the bushing and abut against the left stepped surface of the stepped hole, and the inner hole sealing assembly is sealed with the inner wall of the stepped hole;

[0010] A conical sealing assembly, having a receiving cavity with an open left end, the conical sealing assembly is used to be arranged at the right end of the compressor disk assembly, and the right end of the bushing is located in the receiving cavity, and the mouth of the receiving cavity abuts against the conical surface of the right end of the compressor disk and seals;

[0011] A spoke plate sealing assembly is used to be arranged on the spoke plate of the compressor disk and to seal the inclined hole of the compressor disk;

[0012] The inner hole sealing assembly, the conical surface sealing assembly, the radial plate sealing assembly and the compressor disc assembly together form a pressure chamber, and an air nozzle is arranged on the conical surface sealing assembly to communicate with the pressure chamber.

[0013] Preferably, the compressor disk assembly air tightness inspection device also includes: a baffle, used to abut against the left end face of the compressor disk; a screw, the inner hole sealing assembly is fixedly arranged in the middle of the screw, the left end of the screw is passed through the central through hole of the baffle, and a first locking nut is arranged on the left side of the baffle, and the first locking nut is screwed on the screw; the right end of the screw is passed through the conical surface sealing assembly, and a second locking nut is arranged on the right side of the conical surface sealing assembly, and the second locking nut is screwed on the screw.

[0014] Preferably, the inner hole sealing assembly includes a fixed circular plate, a retaining ring and a first sealing ring; a gap is set between the outer cylindrical surfaces of the fixed circular plate and the retaining ring and the step hole of the bushing; the fixed circular plate is connected to the middle part of the screw; the retaining ring is set on the left side of the fixed circular plate; chamfers are set at the edges of the relative planes of the fixed circular plate and the retaining ring, and the first sealing ring is set in the space formed by the chamfer and the inner wall of the step hole.

[0015] Preferably, the retaining ring is mounted on the fixed circular plate by means of screws, and the retaining ring can move left and right along the screw rod.

[0016] Preferably, the conical sealing assembly includes: a baffle cover having an open accommodating cavity at the left end, and a second sealing ring arranged at the mouth of the baffle cover accommodating cavity for sealing with the inclined surface of the compressor disk; the baffle cover is sleeved on the right end of the screw.

[0017] Preferably, a clamping ring is provided between the stop cover and the second locking nut; chamfers are provided at the edges of the relative openings of the stop cover and the clamping ring, and a third sealing ring is provided in the space formed by the chamfer and the outer cylindrical surface of the screw.

[0018] Preferably, the mouth of the baffle cover accommodating cavity is a conical surface, and its taper is the same as the taper of the conical surface at the right end of the compressor disk; a groove is provided on the conical surface of the mouth of the baffle cover accommodating cavity, and the second sealing ring is clamped on the groove.

[0019] Preferably, the spoke sealing assembly includes a pressure plate and a sealing gasket; both the pressure plate and the sealing gasket are trumpet-shaped and match the transition radius shape of the root of the spoke of the compressor disk; the spoke sealing assembly is installed on the spoke of the compressor disk through a bolt assembly.

[0020] Preferably, a boss is provided on the right end surface of the baffle, and the boss is used to be inserted into the inner hole of the left end surface of the compressor disk.

[0021] On the other hand, the present invention further provides a method for inspecting the air tightness of a compressor disc assembly, using the above-mentioned device for inspecting the air tightness of a compressor disc assembly, comprising the following steps:

[0022] Step S1: cleaning and air-drying the compressor disc assembly so that there is no excess material on the surface of the compressor disc assembly;

[0023] Step S2: installing the inner hole sealing assembly in the stepped hole of the bushing and abutting against the left stepped surface of the stepped hole, so that the inner hole sealing assembly is sealed with the inner wall of the stepped hole;

[0024] Step S3: installing the conical surface sealing assembly at the right end of the compressor disk assembly, and sealing the conical surface at the right end of the compressor disk;

[0025] Step S4: installing the spoke plate sealing assembly on the spoke plate of the compressor disk and sealing the inclined hole of the compressor disk; at this time, the inner hole sealing assembly, the conical surface sealing assembly, the spoke plate sealing assembly and the compressor disk assembly together form a pressure chamber;

[0026] Step S5: Use a test device to connect the air nozzle on the conical sealing assembly, and inject air or nitrogen into the pressure chamber until the air pressure in the pressure chamber reaches 0.5MPa. At this time, stop injecting gas and observe the pointer of the pressure gauge. No pressure drop is allowed within 5 minutes. If the pointer of the pressure gauge drops within 5 minutes, the air tightness of the compressor disc assembly is unqualified; otherwise, it is qualified.

[0027] Due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the inner hole sealing assembly is installed in the step hole of the bushing in the present invention, and abuts against the step surface on the left side of the step hole, so that the inner hole sealing assembly and the inner wall of the step hole are sealed; the conical surface sealing assembly is installed at the right end of the compressor disk assembly, and seals the conical surface F at the right end of the compressor disk; the plate sealing assembly is installed on the radial plate of the compressor disk, and blocks the inclined hole of the compressor disk; the inner hole sealing assembly, the conical surface sealing assembly, the radial plate sealing assembly and the compressor disk assembly together form a pressure chamber; by injecting air or nitrogen into the pressure chamber to detect the air tightness between the end of the bushing extension end on the compressor disk assembly and the compressor disk, the air tightness inspection device provided by the present invention effectively overcomes the problem of difficulty in air tightness inspection caused by the presence of a deep central through hole on the compressor disk assembly, which is a stepped hole, and the compressor disk having an inclined hole P, a conical surface F and other special-shaped structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 This is the assembly drawing of the third stage compressor disc assembly;

[0030] Figure 2A schematic diagram of the air tightness inspection device provided by the present invention when installed on a compressor disc assembly;

[0031] Figure 3 A schematic diagram of the assembly process of the inner hole sealing assembly in the present invention;

[0032] Figure 4 A schematic diagram of the structural decomposition of the conical surface sealing assembly of the present invention;

[0033] Figure 5 A schematic structural diagram of a conical sealing assembly in the present invention;

[0034] Figure 6 A schematic diagram of the structure of the upper pressure plate of the spoke plate sealing assembly in the present invention;

[0035] Figure 7 A schematic diagram of the structure of the sealing gasket on the spoke plate sealing assembly of the present invention;

[0036] Figure 8 A schematic diagram of the structure of the spoke seal assembly when assembled to the compressor disk assembly in the present invention.

[0037] Explanation of the accompanying drawings: 1-screw; 2-baffle; 2a, boss; 3-baffle ring; 4-screw; 5-fixed circular plate; 6-pressure plate; 7-sealing gasket; 8-baffle cover; 801-groove; 9-air nozzle; 10-pressure ring; 11-first locking nut; 12-washer; 13-first sealing ring; 14-bolt; 15-nut; 16-gasket; 17-second sealing ring; 18-third sealing ring; 19-second locking nut; 100-compressor disk; 200-bushing; 201, step hole; 300-pressure chamber. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] Combination Figure 1 As shown in FIG. 1 , it is an assembly diagram of the third-stage compressor disk assembly, which includes a compressor disk 100 and a bushing 200. The bushing 200 is inserted from the right end of the compressor disk 100, and the right end of the bushing 200 is exposed outside the compressor disk 100. The inner hole of the bushing 200 is in the shape of a stepped hole, and one end of the middle is a stepped hole 201. A spoke is provided on the compressor disk 100, and the root of the spoke is a transition fillet. An inclined hole P is provided at the transition fillet, and the inclined hole P penetrates into the inner hole of the bushing 200. The design requires checking the air tightness between the end of the bushing 200 and the compressor disk 100, that is, the air tightness at point V in the figure. There is a conical surface F on the right end face of the compressor disk 100.

[0042] Combination Figure 2 The present invention shows a compressor disc assembly air tightness inspection device, comprising:

[0043] The inner hole sealing assembly is used to be arranged in the stepped hole 201 of the bushing 200 and abut against the left stepped surface of the stepped hole 201, and the inner hole sealing assembly is sealed with the inner wall of the stepped hole 201;

[0044] The conical sealing assembly has a receiving cavity with an open left end, and the conical sealing assembly is used to set the right end of the compressor disk assembly, and the right end of the bushing 200 is located in the receiving cavity, and the mouth of the receiving cavity abuts against the conical surface of the right end of the compressor disk 100 and seals;

[0045] A spoke plate sealing assembly is used to be arranged on the spoke plate of the compressor disk 100 and to seal the inclined hole of the compressor disk 100;

[0046] The inner hole sealing assembly, the conical surface sealing assembly, the radial plate sealing assembly and the compressor disk assembly together form a pressure chamber 300 , and a gas nozzle 9 is arranged on the conical surface sealing assembly and connected to the pressure chamber 300 .

[0047] Furthermore, it also includes: a baffle 2, which is used to abut against the left end face of the compressor disk 100; a screw 1, wherein the middle of the screw 1 is a smooth rod and the two ends are threaded rod structures, the inner hole sealing assembly is fixedly arranged in the middle of the screw 1, the left end of the screw 1 is passed through the central through hole of the baffle 2, and a first locking nut 11 is arranged on the left side of the baffle 2, and the first locking nut 11 is screwed on the screw 1, and a gasket 12 is arranged between the baffle 2 and the first locking nut 11; the right end of the screw 1 is passed through the conical sealing assembly, and a second locking nut 19 is arranged on the right side of the conical sealing assembly, and the second locking nut 19 is screwed on the screw 1.

[0048] Combination Figure 2 and Figure 3 As shown, the inner hole sealing assembly includes a fixed circular plate 5, a retaining ring 3 and a first sealing ring 13; the outer circumferential surfaces of the fixed circular plate 5 and the retaining ring 3 are provided with a gap with the stepped hole 201 of the bushing 200; the fixed circular plate 5 is connected to the middle of the screw 1; the retaining ring 3 is provided on the left side of the fixed circular plate 5; the edges of the relative planes of the fixed circular plate 5 and the retaining ring 3 are provided with chamfers, and the first sealing ring 13 is provided in the space formed by the chamfer and the inner wall of the stepped hole 201. Specifically, the first sealing ring 13 adopts an O-ring, and a through hole is provided in the center of the fixed circular plate 5 for assembling the screw 1, and the screw 1 and the through hole in the center of the fixed circular plate 5 are sealed by welding. The retaining ring 3 is installed on the fixed circular plate 5 by screws 4, and the retaining ring 3 can move left and right along the screw rod; the number of screws 4 is four, which are evenly distributed.

[0049] When the first locking nut 11 is not tightened, the inner hole sealing assembly is not close to the step surface at the left end of the step hole 201 of the bushing 200, and the retaining ring 3 is in a floating state, that is, the retaining ring 3 can slide left and right on the screw rod of the screw 4. The screw 4 is provided to facilitate the installation of the retaining ring on the fixed circular plate 5 and the installation of the first sealing ring 13. At the same time, when the air tightness test is completed, when disassembling the inner hole sealing assembly, it is only necessary to pull the screw rod 1 to the right and pull the fixed circular plate 5 to the right, and the screw 4 can drive the retaining ring 3 to be pulled out together.

[0050] When the first locking nut 11 is tightened, the screw 1 will move to the left and drive the fixed circular plate 5 to move to the left. The fixed circular plate 5 pushes the retaining ring 3 against the left end surface of the step hole 201. At the same time, during the movement of the fixed circular plate 5 to the left, the chamfered angle of the fixed circular plate 5 and the retaining ring 3 squeezes the first sealing ring 13, so that the first sealing ring 13 is deformed and fills the space formed by the chamfered angle and the inner wall of the step hole 201 to form a seal. Specifically, after the first sealing ring 13 is squeezed and deformed, its outer diameter is 0.5 to 1 mm larger than the outer diameter of the fixed circular plate 5 or the retaining ring 3, so as to ensure that the first sealing ring 13 is completely close to the inner wall of the step hole 201 and ensure the sealing performance.

[0051] Combination Figure 2 , Figure 4 and Figure 5 As shown, the conical surface sealing assembly includes: a stopper 8, which has an open-ended accommodating cavity at the left end; a second sealing ring 17, which is arranged at the mouth of the accommodating cavity of the stopper 8 and is used to seal with the inclined surface 101 of the compressor disk 100; the stopper 8 is sleeved on the right end of the screw 1. Further, a clamping ring 10 is arranged between the stopper 8 and the second locking nut 19, and the clamping ring 10 is slidably matched with the screw 1; a chamfer is arranged at the edges of the relative openings of the stopper 8 and the clamping ring 10, and a third sealing ring 18 is arranged in the space formed by the chamfer and the outer cylindrical surface of the screw 1, and the diameter of the third sealing ring 18 is smaller than the diameter of the polished rod on the screw 1. When the second locking nut 19 is tightened and the clamping ring 10 is compressed, the chamfer of the stopper 8 and the clamping ring 10 squeezes the third sealing ring 18 to deform it, so as to ensure the effectiveness of the sealing between the third sealing ring 18 and the screw 1 and the stopper 8. The air nozzle 9 is arranged on the baffle 8, and the air nozzle 9 is used to connect to an external air pressure device for inflation.

[0052] Combination Figure 4 , Figure 5 As shown, in this embodiment, the mouth of the accommodating cavity of the baffle cover 8 is a conical surface, and its taper is the same as the taper of the conical surface at the right end of the compressor disk 100; a groove 801 is provided on the conical surface of the mouth of the accommodating cavity of the baffle cover 8, and the second sealing ring 17 is clamped on the groove 801. The mouth of the accommodating cavity of the baffle cover 8 adopts the same taper as the conical surface F at the right end of the compressor disk 100, that is, the mouth of the accommodating cavity on the baffle cover 8 matches the conical surface F on the compressor disk 100, and is used in conjunction with the second sealing ring 17, which can better ensure the sealing effect.

[0053] The specific operating principle of the sealing of the conical surface sealing assembly is: when the first locking nut 11 is locked in place, the second locking nut 19 is rotated and tightened, and the second locking nut 19 pushes the clamping ring 10 and presses the baffle cover 8. At this time, the baffle cover 8 and the chamfered angle of the clamping ring 10 squeeze the third sealing ring 18 to deform it. The third sealing ring 18 forms a seal with the baffle cover 8 and the screw 1. At the same time, the mouth of the accommodating cavity of the baffle cover 8 is pressed against the conical surface F at the right end of the compressor disk 100, further squeezing the second sealing ring 17, so that the baffle cover 8 forms a seal with the conical surface F at the right end of the compressor disk 100.

[0054] Combination Figures 6 to 8As shown, in this embodiment, the spoke plate sealing assembly includes a pressure plate 6 and a sealing gasket 7; both the pressure plate 6 and the sealing gasket 7 are trumpet-shaped and match the transition fillet shape of the root of the spoke plate of the compressor disk 100; the spoke plate sealing assembly is installed on the spoke plate of the compressor disk 100 through a bolt assembly. The bolt assembly includes bolts 14, nuts 15, and gaskets 16. By tightening the nuts 15, the pressure plate 6 and the sealing gasket 7 are pressed against the surface D of the transition fillet of the root of the spoke plate of the compressor disk 100, and the inclined hole P of the compressor disk 100 is sealed. To ensure the position accuracy of the pressure plate 6 and the sealing gasket 7 holes, the eight bolts 14 can be inserted symmetrically and evenly, and the sealing gasket 7 must completely cover the inclined hole P to ensure the airtightness of the pressure chamber 300. At least eight sets of bolts 14, nuts 15, and gaskets 16 are required for compression to ensure the airtightness of the inner cavity of the part. When tightening and removing the eight groups of bolts 14, nuts 15, and washers 16, it is necessary to apply force cyclically to avoid deformation of the parts due to uneven force.

[0055] Combination Figure 2 As shown, a boss 2 a is provided on the right end surface of the baffle 2 , and the boss 2 a is used to be inserted into the inner hole of the left end surface of the compressor disk 100 .

[0056] In addition, this embodiment also provides a method for inspecting the air tightness of a compressor disc assembly, using the above-mentioned air tightness inspection device for the compressor disc assembly, and comprising the following steps:

[0057] Step S1: cleaning and air-drying the compressor disc assembly so that there is no excess material on the surface of the compressor disc assembly;

[0058] Step S2: installing the inner hole sealing assembly in the stepped hole 201 of the bushing 200 and abutting against the left stepped surface of the stepped hole 201, so that the inner hole sealing assembly is sealed with the inner wall of the stepped hole 201;

[0059] Step S3: installing the conical surface sealing assembly at the right end of the compressor disk assembly, and sealing the conical surface at the right end of the compressor disk 100;

[0060] Step S4: installing the spoke plate sealing assembly on the spoke plate of the compressor disk 100 and sealing the inclined hole of the compressor disk 100; at this time, the inner hole sealing assembly, the conical surface sealing assembly, the spoke plate sealing assembly and the compressor disk assembly together form a pressure chamber 300;

[0061] Step S5: Use the test device to connect the air nozzle 9 on the conical sealing assembly, and inject air or nitrogen into the pressure chamber 300 until the air pressure in the pressure chamber 300 reaches 0.5MPa. At this time, stop injecting gas and observe the pointer of the pressure gauge. No pressure drop is allowed within 5 minutes. If the pointer of the pressure gauge drops within 5 minutes, the air tightness of the compressor disc assembly is unqualified; otherwise, it is qualified.

[0062] The specific operation method is as follows:

[0063] Use the baffle 2 to be installed on the left end of the compressor disk 100, install the washer 12 on the screw 1, tighten the first locking nut 11, and the fixed circular plate 5 pushes the retaining ring 3 to rest against the left end surface of the step hole 201. At the same time, during the leftward movement of the fixed circular plate 5, the chamfered angle of the fixed circular plate 5 and the retaining ring 3 squeezes the first sealing ring 13, so that the first sealing ring 13 is deformed and fills the space formed by the chamfered angle and the inner wall of the step hole 201 to form a seal.

[0064] A third sealing ring 18 is installed on the other end of the screw 1. The third sealing ring 18 must be close to the baffle cover 8. Then, the clamping ring 10 is installed. The second locking nut 19 is tightened and the clamping ring 10 is compressed. The baffle cover 8 and the chamfered angle of the clamping ring 10 squeeze the third sealing ring 18 to deform it and form a seal. At the same time, the mouth of the accommodating cavity of the baffle cover 8 is pressed against the conical surface F at the right end of the compressor disk 100 and squeezes the second sealing ring 17 to form a seal.

[0065] Use the sealing gasket 7 to close the inclined hole P, make sure that the sealing gasket 7 completely covers the inclined hole P, use the pressing plate 6 to press the sealing gasket 7, and use the bolt 14, nut 15, and gasket 16 to press the sealing gasket 7 and the pressing plate 6. It should be noted that the tightening bolts should be tightened cyclically to balance the force on the sealing gasket 7 and better ensure the air tightness of the test.

[0066] After the air tightness test, first remove the bolts 14, nuts 15, and gaskets 16, and then remove the pressure plate 6 and the sealing gasket 7. The removal of the bolts 14, nuts 15, and gaskets 16 also requires cyclic unloading to avoid irregular force on the parts and deformation of the parts.

[0067] Remove the second locking nut 19, the clamping ring 10, the third sealing ring 18, and the blocking cover 8 in sequence.

[0068] Then remove the first locking nut 11, the washer 12, the baffle 2 in sequence, and finally remove the inner hole sealing assembly; clean and air-dry the compressor disc parts to ensure that the parts do not contain any excess materials to ensure the assembly requirements of the next level of components.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A compressor disc assembly air tightness inspection device, characterized in that: include: An inner hole sealing component is used to be arranged in the stepped hole (201) of the bushing (200) and abut against the left step surface of the stepped hole (201), and the inner hole sealing component is sealed with the inner wall of the stepped hole (201); A conical sealing assembly is provided with a receiving cavity with an open left end, the conical sealing assembly is used to be arranged at the right end of the compressor disk assembly, the right end of the bushing (200) is located in the receiving cavity, and the mouth of the receiving cavity abuts against the conical surface of the right end of the compressor disk (100) and is sealed; A spoke plate sealing assembly is used to be arranged on the spoke plate of the compressor disk (100) and to seal the inclined hole of the compressor disk (100); The inner hole sealing assembly, the conical surface sealing assembly, the radial plate sealing assembly and the compressor disk assembly together form a pressure chamber (300), and a gas nozzle (9) is provided on the conical surface sealing assembly to communicate with the pressure chamber (300); A baffle (2) for abutting against the left end surface of the compressor disc (100); A screw (1), wherein the inner hole sealing assembly is fixedly arranged in the middle of the screw (1), the left end of the screw (1) is inserted into the central through hole of the baffle (2), and a first locking nut (11) is arranged on the left side of the baffle (2), and the first locking nut (11) is screwed onto the screw (1); The right end of the screw rod (1) is inserted into the conical surface sealing assembly, and a second locking nut (19) is arranged on the right side of the conical surface sealing assembly, and the second locking nut (19) is screwed onto the screw rod (1); The inner hole sealing assembly comprises a fixed circular plate (5), a retaining ring (3) and a first sealing ring (13); a gap is set between the outer circumferential surfaces of the fixed circular plate (5) and the retaining ring (3) and the stepped hole (201) of the bushing (200); the fixed circular plate (5) is connected to the middle part of the screw rod (1); the retaining ring (3) is arranged on the left side of the fixed circular plate (5); the edges of the relative planes of the fixed circular plate (5) and the retaining ring (3) are both provided with chamfers, and the first sealing ring (13) is arranged in the space formed by the chamfer and the inner wall of the stepped hole (201); The conical surface sealing assembly comprises: a stopper (8) having a receiving cavity with an open left end; a second sealing ring (17) arranged at the mouth of the receiving cavity of the stopper (8) and used for sealing with the inclined surface (101) of the compressor disk (100); the stopper (8) is sleeved on the right end of the screw (1); The radial plate sealing assembly comprises a pressure plate (6) and a sealing gasket (7); the pressure plate (6) and the sealing gasket (7) are both trumpet-shaped and match the transition fillet shape of the radial plate root of the compressor disk (100); the radial plate sealing assembly is installed on the radial plate of the compressor disk (100) by means of a bolt assembly.

2. The air tightness inspection device for a compressor disc assembly according to claim 1, characterized in that: The retaining ring (3) is mounted on the fixed circular plate (5) through screws (4), and the retaining ring (3) can move left and right along the screw rod.

3. The air tightness inspection device for a compressor disc assembly according to claim 1, characterized in that: A clamping ring (10) is arranged between the blocking cover (8) and the second locking nut (19); Chamfered corners are arranged at the edges of the apertures of the stop cover (8) and the clamping ring (10) relative to each other, and a third sealing ring (18) is arranged in the space formed by the chamfered corner and the outer cylindrical surface of the screw rod (1).

4. The air tightness inspection device for a compressor disc assembly according to claim 1, characterized in that: The mouth of the accommodating cavity of the baffle cover (8) is a conical surface, and its taper is the same as the taper of the conical surface at the right end of the compressor disk (100); a groove (801) is provided on the conical surface of the mouth of the accommodating cavity of the baffle cover (8), and the second sealing ring (17) is clamped on the groove (801).

5. The air tightness inspection device for a compressor disc assembly according to claim 1, characterized in that: A boss (2a) is arranged on the right end surface of the baffle (2), and the boss (2a) is used to be inserted into the inner hole of the left end surface of the compressor disk (100).

6. A method for inspecting the air tightness of a compressor disc assembly, characterized in that: The compressor disc assembly air tightness inspection device according to any one of claims 1 to 5 comprises the following steps: Step S1: cleaning and air-drying the compressor disc assembly so that there is no excess material on the surface of the compressor disc assembly; Step S2: installing the inner hole sealing component in the stepped hole (201) of the bushing (200) and abutting against the left stepped surface of the stepped hole (201), so that the inner hole sealing component and the inner wall of the stepped hole (201) are sealed; Step S3: installing the conical surface sealing assembly at the right end of the compressor disk assembly, and sealing the conical surface at the right end of the compressor disk (100); Step S4: installing the radial plate sealing assembly on the radial plate of the compressor disk (100) and sealing the inclined hole of the compressor disk (100); at this time, the inner hole sealing assembly, the conical surface sealing assembly, the radial plate sealing assembly and the compressor disk assembly together form a pressure chamber (300); Step S5: Use a test device to connect the air nozzle (9) on the conical sealing assembly, and inject air or nitrogen into the pressure chamber (300) until the air pressure in the pressure chamber (300) reaches 0.5 MPa. At this time, stop injecting gas and observe the pointer of the pressure gauge. No pressure drop is allowed within 5 minutes. If the pointer of the pressure gauge drops within 5 minutes, the air tightness of the compressor disc assembly is unqualified; otherwise, it is qualified.

Images