Sealing detection device for rear support housing and detection method

Abstract

The application discloses a sealing detection device for a rear supporting shell, which comprises a pipeline sealing assembly for sealing each hole of a pipeline and an air chamber sealing assembly for sealing each hole of an air chamber. The pipeline sealing assembly comprises a sealing piece for sealing a pipe head, a supporting block with a positioning structure matched with the position of the pipe head, and a first pressing piece arranged on the supporting block and capable of moving axially relative to the pipe head. The air chamber sealing assembly comprises a supporting plate sealing assembly for sealing a gas permeable hole of a supporting plate assembly, a first sealing assembly for sealing a first end face hole of a seat assembly, and a second sealing assembly for sealing a second end face hole and a third end face hole of the seat assembly. By using the sealing detection device, the sealing of the pipeline and the air chamber of the rear supporting shell after a service period is detected, and the air leakage and oil leakage caused by the welding seam and cracks of the rear supporting shell when the rear supporting shell is put into use again are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing detection of aero-engine parts, in particular to a sealing detection device for a rear supporting shell. In addition, the present application also relates to a sealing detection method for a rear supporting shell comprising the above-mentioned detection device. BACKGROUND

[0002] The rear supporting shell of a certain type of engine is combined with an air pipe, an oil pipe and an air chamber 5, and its structure is shown in Figures 1 to 5 The rear supporting shell comprises a seat assembly 2 in the form of a cylinder, a plurality of support plate assemblies 3 and a mounting plate 4 in the form of a cylinder. The two ends of the support plate assembly 3 are respectively connected to the inner ring surface of the mounting plate 4 and the outer ring surface of the seat assembly 2. The inner walls of the plurality of support plate assemblies 3, the inner ring surface of the mounting plate 4 and the outer ring surface of the seat assembly 2 jointly enclose the air chamber 5. A pipe is arranged in the air chamber 5 radially relative to the seat assembly 2. The pipe comprises a pipe body and pipe heads connected to the two ends of the pipe body. The pipe heads are arranged on the end surface of the support plate assembly 3, the outer ring surface of the mounting plate 4 or the inner ring surface of the seat assembly 2. A plurality of first end surface holes 21 are uniformly arranged on the first end surface of the seat assembly 2 in the circumferential direction. A plurality of second end surface holes 22 and third end surface holes 23 are uniformly arranged on the second end surface of the seat assembly 2 in the circumferential direction. The third end surface holes 23 are arranged between adjacent two second end surface holes 22. The first end surface holes 21 and the third end surface holes 23 are threaded holes. The support plate assembly 3 has a plug seat 35. The support plate assembly comprises an upper support plate 31, a lower support plate 32 and a side support plate 33.

[0003] In this embodiment, the pipe head and the pipe body are welded. The pipe heads at the two ends of the pipe are connected to the support plate assembly 3, the seat assembly 2 and other parts by welding to form the air chamber 5. After the rear supporting shell combination is used for one life time of the engine, in order to avoid cracks in the welds 1 everywhere after use and oil / gas leakage, a pressurized detection method is used for sealing detection of the pipe and the air chamber 5. Due to the structure of the parts, the following problems exist in the detection: the process requirement of each air hole of the support plate assembly 3 is low, and the relative distance between each air hole has deviation; there is no installation surface near the more holes to provide a pressing support for the plugging clamp, which makes it impossible to plug; the ports of part of the pipes are on the inner ring surface of the seat assembly 2, and the operation space is limited; the extension length of part of the pipes out of the outer ring surface of the mounting plate 4 has deviation due to production error; the number of small holes that need to be plugged for sealing detection is large, and the plugging time is long, which affects the operation efficiency. SUMMARY

[0004] The present application provides a sealing detection device and a detection method for a rear supporting shell to solve the technical problem that the rear supporting shell of the engine is not subjected to sealing detection in the prior art, resulting in oil / gas leakage.

[0005] The technical solution adopted by the present application is as follows:

[0006] A sealing detection device for a rear support shell, the rear support shell comprising a seat assembly, a support plate assembly and a mounting plate,

[0007] The sealing detection device comprises a pipe plugging assembly for plugging each hole of the pipes of the rear support shell respectively and an air chamber plugging assembly for plugging each hole of the air chamber of the rear support shell,

[0008] The pipe plugging assembly comprises a plugging piece for plugging the pipe head of the pipe of the rear support shell, a support block with a positioning structure matched with the position of the pipe head and a first pressing piece arranged on the support block for axial movement relative to the pipe head, the first pressing piece is used for positioning and axially pressing the plugging piece on the port of the pipe head;

[0009] The air chamber plugging assembly comprises a support plate sealing assembly arranged on the support plate assembly for sealing the air permeable hole of the support plate assembly, a first sealing assembly for sealing the first end face hole of the first end face of the seat assembly and a second sealing assembly for sealing the second end face hole and the third end face hole of the second end face of the seat assembly.

[0010] As a preferred mode, the rear support shell is provided with a first pipe, a second pipe and a third pipe, the first pipe comprises a first pipe head arranged on the outer end face of the support plate assembly and a second pipe head arranged on the inner annular face of the seat assembly, the second pipe comprises a third pipe head arranged on the outer annular face of the mounting plate and a fourth pipe head arranged on the inner annular face of the seat assembly, and the third pipe comprises a first pipe head arranged on the outer end face of the support plate assembly and a fifth pipe head arranged on the inner end face of the support plate assembly,

[0011] The plugging piece is a tapered pipe head plug matched with the port aperture of the pipe head; the first pressing piece is a screw structure, the screw structure is threadedly connected to the support block, the small end of the first pressing piece is axially pressed on the pipe head plug, and the large end of the first pressing piece has a force applying structure for applying torque to the first pressing piece to move the first pressing piece on the support block axially relative to the port of the pipe head;

[0012] The first pressing piece of the pipe sealing assembly is threadedly connected with the corresponding pipe head plug of the corresponding pipe, and the first pressing piece and the pipe head plug are both hollow tubes, and the large end of the first pressing piece has an air pipe connecting structure for connecting with an external test air pipe.

[0013] As a preferred mode, the pipe head has a first threaded hole, and the support block is locked and fixed in the first threaded hole of the corresponding pipe head by a positioning screw;

[0014] The support block is L-shaped and has first and second perpendicular mounting surfaces, the first mounting surface of the support block is threadedly connected to the first compression member corresponding to the port position of the pipe head, and the second mounting surface of the support block is attached to the second end surface of the seat assembly and is provided with a positioning screw hole for connecting with the third end surface hole to be fixed to the second end surface of the seat assembly.

[0015] As a preferred mode, the support block is provided with a guide cavity matched with the outer diameter of the large end of the pipe head plug.

[0016] As a preferred mode, the first sealing assembly comprises a first screw and a first sealing member arranged corresponding to each of the first end surface holes.

[0017] The second sealing assembly comprises a ring-shaped second sealing member matched with the distribution positions of the second and third end surface holes, and further comprises a first pressing plate pressed against the second sealing member and a second screw threadedly connected to the third end surface hole, the small end of the second screw passes through the first pressing plate and the second sealing member and is threadedly connected to the third end surface hole, and the large end of the second screw is pressed against the first pressing plate.

[0018] As a preferred mode, the support plate sealing assembly comprises:

[0019] A support plate plug in a conical shape for plugging the air vent hole;

[0020] A mounting block for fixed connection with the support plate assembly and a second compression member, the second compression member is threadedly connected to the mounting block, and the second compression member axially compresses and positions the support plate plug at the large end of the support plate plug.

[0021] As a preferred mode, the large end of the support plate plug extends radially outward to form an extension to increase the end surface area, and the small end surface of the second compression member is arc-shaped to match the installation angle of the support plate plug.

[0022] As a preferred mode, the air chamber plugging assembly further comprises a pipe head hole sealing assembly for corresponding installation of the third pipe head position on the outer ring surface of the mounting plate and corresponding installation of the first pipe head on the outer side end surface of the support plate assembly.

[0023] The pipe head hole sealing assembly corresponding to the third pipe head position comprises:

[0024] A third screw for threadedly connecting to the threaded hole on the outer ring surface of the mounting plate corresponding to the third pipe head position;

[0025] A third sealing member in a ring shape, the third pipe head is arranged in the inner ring surface of the third sealing member, the thickness of the third sealing member is matched with the length of the third pipe head protruding from the mounting plate,

[0026] A fourth sealing member arranged at the free end surface of the third sealing member corresponding to the inner ring surface port position of the third sealing member,

[0027] A second pressing plate arranged at the free end surface of the fourth sealing member, the small end of the third screw is connected with the threaded hole of the outer ring surface of the mounting plate through the second pressing plate and the third sealing member in sequence, and the large end of the third screw abuts against the free end surface of the second pressing plate, thereby compressing and fixing the pipe head hole sealing assembly;

[0028] The pipe head hole sealing assembly arranged corresponding to the position of the first pipe head comprises:

[0029] A fourth screw, the small end of the fourth screw is connected with the first threaded hole through the mounting block, and the large end of the fourth screw abuts against the free end surface of the mounting block;

[0030] A fifth sealing member arranged between the mounting end surface of the mounting block and the end surface of the pipe head, the small end of the fourth screw is connected with the first threaded hole through the mounting block and the fifth sealing member in sequence.

[0031] As a preferred mode,

[0032] The mounting block comprises an upper clamping block and a lower clamping block with a fixed relative position, the upper clamping block and the lower clamping block are arranged on both sides of the support plate assembly at the position of the air hole of the support plate assembly, and the clamping surfaces of the upper clamping block and the lower clamping block are V-shaped in structure, thereby increasing the force contact surface with the outer wall of the support plate assembly.

[0033] According to another aspect of the present application, a sealing detection method for a rear support shell is also provided, which applies any of the above detection devices, and the detection method comprises:

[0034] The pipe head ports at both ends of the pipe of the target rear support shell are blocked by using the pipe plugging assembly, the first pressing member is rotated through the force applying structure to make the first pressing member press the pipe head plug, the external test air pipe is connected to the air pipe connecting structure of the first pressing member to pass compressed gas, the target rear support shell is immersed in liquid, if there is no bubble, it is judged to be qualified, if there is a bubble, the position of the bubble is judged to determine the unqualified position of the sealing;

[0035] Respectively use the branch plate sealing assembly, the pipe head hole sealing assembly, the first sealing assembly and the second sealing assembly to seal the holes of the air chamber of the target rear supporting shell, seal the plug seat of the branch plate assembly, connect the external test gas pipe to one of the plug seats, and pass compressed gas, immerse the target rear supporting shell in liquid, and if there is no bubble, it is judged to be qualified, and if there is a bubble, the unqualified position is judged according to the position of the bubble.

[0036] The present application has the following beneficial effects: the pipeline sealing assembly of the sealing detection device seals each pipe head hole of the pipeline of the rear supporting shell through the sealing member, the supporting block is provided with a positioning structure matched with the position of the pipe head, the first pressing member can move axially on the supporting block to press the sealing member to seal the port of the pipeline, one of the two cooperatively arranged pipeline sealing assemblies is provided with an air path connecting structure to connect the external test gas pipe, so that the gas in the pipeline can be pressurized for testing to check the sealing performance of the pipeline; on the other hand, the gas chamber sealing assembly seals the gas permeable hole, the first end face hole, the second end face hole and the third end face hole on the branch plate assembly, and seals the plug seat of the branch plate assembly and connects the external test gas pipe to one of the plug seats for pressurized testing.

[0037] The sealing detection device can be used for existing rear supporting shells of multiple specifications, and the positioning structure and clamping structure matched with different positions are arranged to complete the sealing of the rear supporting shell by the detection device, so as to reduce the difficulty of sealing operation and improve the efficiency; the pipeline and the gas chamber of the rear supporting shell after a service period are sealed simultaneously or separately, and then the sealing pressurized detection is carried out, so as to avoid the leakage of air / oil caused by the welding crack of the rear supporting shell when the rear supporting shell is put into use again.

[0038] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in explaining the application. In the drawings:

[0040] Figure 1 is a structural schematic view of the rear supporting shell in the prior art;

[0041] Figure 2 is a sectional view of A in Figure 1

[0042] Figure 3 is a sectional view of B in Figure 1 ​​

[0043] Figure 4 yes Figure 2 C-direction partial view;

[0044] Figure 5 yes Figure 1 Structural diagram of the central support plate assembly;

[0045] Figure 6 This is a schematic diagram of the first pipe sealing structure according to a preferred embodiment of the present invention;

[0046] Figure 7 yes Figure 6 Sectional view along direction D;

[0047] Figure 8 This is a schematic diagram of the second pipe sealing structure according to a preferred embodiment of the present invention;

[0048] Figure 9 yes Figure 8 Sectional view along direction E;

[0049] Figure 10 This is a schematic diagram of the third pipe sealing structure according to a preferred embodiment of the present invention;

[0050] Figure 11 yes Figure 10 Sectional view along direction F;

[0051] Figure 12 This is a schematic diagram of the vent sealing structure at the first pipe location in a preferred embodiment of the present invention;

[0052] Figure 13 This is a schematic diagram of other vent sealing structures in a preferred embodiment of the present invention;

[0053] Figure 14 yes Figure 13 Sectional view along line G;

[0054] Figure 15 yes Figure 13 H-direction sectional view;

[0055] Figure 16 This is a schematic diagram of the second and third end face holes of a preferred embodiment of the present invention;

[0056] Figure 17 yes Figure 16 Sectional view along line I;

[0057] Figure 18 This is a schematic diagram of the pipe head hole sealing structure at the third pipe head position in a preferred embodiment of the present invention;

[0058] Figure 19 yes Figure 18 J-direction sectional view;

[0059] Figure 20 is a schematic view of a plug seat sealing structure of a preferred embodiment of the present application Figure 1 ;

[0060] Figure 21 is a schematic view of a plug seat sealing structure of a preferred embodiment of the present application Figure 2 .

[0061] 1, weld 2, seat assembly 21, first end face hole 22, second end face hole 23, third end face hole 3, support plate assembly 31, upper support plate 32, lower support plate 33, side support plate 34, air vent hole 35, plug seat 4, mounting plate 5, air cavity 51, first pipe 52, second pipe 53, third pipe 6, first pipe head 61, first threaded hole 7, second pipe head 8, third pipe head 9, fourth pipe head 10, fifth pipe head 111, sealing member 112, support block 1121, first mounting surface 1122, second mounting surface 1123, guide cavity 1124, positioning screw 113, first pressing member 114, force applying structure 115, air pipe connecting structure 121, support plate plug 1211, extension 122, mounting block 1221, upper clamping block 1222, lower clamping block 1223, sixth screw 123, second pressing member 131, first screw 132, first sealing member 141, second sealing member 142, first pressing plate 143, second screw 151, third screw 152, third sealing member 153, fourth sealing member 154, second pressing plate 155, fourth screw 156, fifth sealing member DETAILED DESCRIPTION

[0062] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] With reference to Figures 6 to 21 , a preferred embodiment of the present application provides a sealing detection device for a rear support shell,

[0064] including a pipe sealing assembly for sealing each hole of the pipes of the rear support shell and an air cavity sealing assembly for sealing each hole of the air cavity 5 of the rear support shell,

[0065] The pipe sealing assembly includes a sealing member 111 for sealing the pipe head of the pipe of the rear support shell, a support block 112 having a positioning structure matched with the position of the pipe head, and a first pressing member 113 disposed on the support block 112 and axially movable relative to the pipe head, the first pressing member 113 being used for positioning and axially pressing the sealing member 111 on the port of the pipe head;

[0066] The air chamber sealing assembly comprises a support plate sealing assembly arranged on the support plate assembly 3 for sealing the air permeable hole 34 of the support plate assembly 3, a first sealing assembly for sealing the first end face hole 21 of the seat assembly 2, and a second sealing assembly for sealing the second end face hole 22 and the third end face hole 23 of the seat assembly 2.

[0067] It can be understood that the pipe sealing assembly of the sealing detection device of the embodiment is sealed to the port of the pipe head by the sealing piece 111, the support block 112 is provided with a positioning structure matched with the position of the pipe head, so that the first pressing piece 113 connected to the support block 112 is positioned stably and can move axially on the support block 112 to press the sealing piece 111 to seal the pipe, one of the two corresponding pipe sealing assemblies has an air path connection structure connected to the external test gas pipe, so that the pipe can be pressurized and tested to check its sealing performance; similarly, after the air permeable hole 34, the first end face hole 21, the second end face hole 22, and the third end face hole 23 on the support plate assembly 3 are sealed by the air chamber sealing assembly, the plug seat 35 of the support plate assembly 3 is sealed, and the external test gas pipe is connected to one of the plug seats 35 for pressurized testing.

[0068] By using the sealing detection device, the existing multi-specification rear support shell can be matched, the positioning structure and clamping structure matched with different positions are arranged, and the sealing of the rear support shell by the detection device is completed, so that the sealing operation difficulty is reduced and the efficiency is improved; by simultaneously or separately sealing the pipes and the air chamber 5 of the rear support shell after a service period, pressurized sealing detection can be performed, and the phenomenon of air leakage / oil leakage caused by cracks in the weld 1 when the rear support shell is reused in the engine can be avoided.

[0069] In the prior art, the air chamber 5 of the rear support shell is provided with a first pipe 51, a second pipe 52, and a third pipe 53, the first pipe 51 has a first pipe head 6 arranged on the outer end face of the support plate assembly 3 and a second pipe head 7 arranged on the inner ring face of the seat assembly 2 at both ends, the second pipe 52 has a third pipe head 8 arranged on the outer ring face of the mounting plate 4 and a fourth pipe head 9 arranged on the inner ring face of the seat assembly 2 at both ends, and the third pipe 53 has a first pipe head 6 arranged on the outer end face of the support plate assembly 3 and a fifth pipe head 10 arranged on the inner end face of the support plate assembly 3 at both ends.

[0070] The plugging member 111 of the present embodiment is a tapered pipe head plug for adapting to the port aperture of the pipe head, and it should be understood that the small end outer diameter of the pipe head plug is smaller than the pipe head port aperture, and the large end outer diameter of the pipe head plug is larger than the pipe head port aperture; the first pressing member 113 is screw rod structure and is threadedly connected to the support block 112, that is, the first pressing member 113 is provided with external threads, and the support block 112 is provided with a threaded hole corresponding to the position of the pipe head, the small end of the first pressing member 113 is axially pressed to the pipe head plug, and the large end of the first pressing member 113 has a force applying structure 114 for applying torque to the first pressing member 113 to axially move the first pressing member 113 on the support block 112 relative to the port of the pipe head; the force applying structure 114 can be a hexagonal recess or a hexagonal edge formed on the large end of the first pressing member, which is convenient for force application, and the specific structure is not limited;

[0071] Among them, due to the limited ring surface space in the seat assembly 2, the plugging and clamping operation is not convenient, the force applying structure 114 of the first pressing member 113 arranged at the position of the second pipe head 7 and the position of the fourth pipe head 9 is a handle arranged radially relative to the first pressing member 113, avoiding structural interference and facilitating operation;

[0072] Among them, the first pipe head 6, the third pipe head 8 and the fifth pipe head 10 have a first threaded hole 61, and the corresponding support block 112 is locked and fixed to the pipe head by a positioning screw 1124 matched with the first threaded hole 61, that is, the small end of the positioning screw 1124 passes through the support block 112 and is connected with the first threaded hole 61, and the large end of the screw abuts against the end face of the support block 112 to fix the support block 112, wherein the first threaded hole 61 can be a countersunk hole;

[0073] It should be noted that the first pressing member 113 of one of the two pipeline sealing assemblies used in the same pipeline is threadedly connected with the pipe head plug of the corresponding pipeline, and the first pressing member 113 and the pipe head plug are both hollow tubes, the large end of the first pressing member 113 has a gas pipe connecting structure 115 for connecting with an external test gas pipe, and the pipeline sealing assembly with the gas pipe connecting structure 115 is preferably arranged at the position of the pipe head with larger operation space to avoid the connection of the external test gas pipe and the bending deformation thereof affecting the gas inlet; Specifically, in the pipeline sealing assembly with the gas pipe connecting structure 115 of the present embodiment, the large end of the first pressing member 113 has a gas pipe connecting cavity, the first pressing member 113 is a hollow tube, and the small end of the first pressing member 113 has external threads, the pipe head plug has internal threads matched with the external threads of the small end of the first pressing member 113, and the two are threadedly connected, thereby being blocked in the pipe head hole and allowing gas to enter through the hollow pipe of the first pressing member 113.

[0074] Since the inner annular space of the seat assembly 2 is limited and it is inconvenient to block the pipe head by a conventional clamp, in the present embodiment, the support block 112 at the position of the second pipe head 7 and the support block 112 at the position of the fourth pipe head 9 are both provided in an L shape and have a first mounting surface 1121 and a second mounting surface 1122 perpendicular to each other, the first mounting surface 1121 of the support block 112 is threadedly connected with a first pressing member 113 at the position of the corresponding pipe head port, and the second mounting surface 1122 of the support block 112 is attached to the second end surface of the seat assembly 2 and is fixed to the second end surface by a positioning screw 1124 passing through the third end surface hole 23; it can be understood that the support block 112 is connected by at least two third end surface holes 23 on the end surface of the seat assembly 2 to position the first mounting surface 1121 in the inner annular space of the seat assembly 2, so that the first pressing member 113 can be operated to press and fit the pipe head plug to achieve blocking; it can be understood that the second mounting plate 4 is in the shape of a sector and has an arc that is adapted to the second end surface of the seat assembly 2.

[0075] Further, each support block 112 of the present embodiment is provided with a guide cavity 1123 adapted to the outer diameter of the large end of the pipe head plug, so as to radially limit the pipe head plug, and the pipe head plug can be placed in the guide cavity 1123 before blocking, and the first pressing member 113 is rotated to push the pipe head plug to block the pipe head hole after the support block 112 is fixed, effectively preventing the pipe head plug from being deviated, and the operation is convenient.

[0076] In the present embodiment, the first sealing assembly includes a first screw 131 arranged corresponding to each first end surface hole 21 and a first sealing member 132 arranged corresponding to each first end surface hole 21, wherein the first sealing member 132 is a gasket;

[0077] The second sealing assembly includes a second sealing member 141 (in this embodiment, a ring-shaped gasket) in the shape of a ring that is adapted to the distribution positions of the second end face holes 22 and the third end face holes 23, and further includes a first pressing plate 142 that is pressed against the second sealing member 141 and a second screw 143 that is threadedly connected to the third end face holes 23, the small end of the second screw 143 passing through the first pressing plate 142 and the second sealing member 141 and being threadedly connected to the third end face holes 23, and the large end of the second screw 143 being pressed against the first pressing plate 142. Because the number of holes in the second end face of the seat assembly 2 is large (12 second end face holes 22 and 12 third end face holes 23), and the second end face holes 22 are light holes that cannot be connected to screws, the use of plugs or screws for single plugging operation is low in efficiency. In this embodiment, a ring-shaped second sealing member 141 is attached to the second end face of the seat assembly 2, and at the same time, it covers each end face hole. The second screw 143 is threadedly connected to the third end face hole 23 after passing through the hole in the first pressing plate 142 and the second sealing member 141, effectively improving the clamping operation efficiency. The first pressing plate 142 is provided to increase the pressing surface and ensure the sealing effect. The second sealing member 141 does not need to be perforated corresponding to all the third end face holes 23, and can be connected by the second screw 143 to ensure the plugging effect. The large end of the second screw 143 is provided with a gasket between the inner end face and the first pressing plate 142 to ensure the sealing property. Similarly, the first sealing member 132 of the first sealing assembly can also be a ring-shaped gasket that is adapted to the first end face, and is provided with a hole corresponding to part of the first end face holes 21 to pass the first screw 131, thereby improving the clamping and plugging efficiency.

[0078] In this embodiment, the support plate sealing assembly includes:

[0079] A support plate plug 121 in the shape of a cone for plugging the gas permeable hole 34. It should be understood that the small end of the support plate plug 121 has an outer diameter smaller than the hole diameter of the gas permeable hole 34, and the large end of the support plate plug 121 has an outer diameter larger than the hole diameter of the gas permeable hole 34.

[0080] An installation block 122 and a second pressing member 123 for fixed connection with the support plate assembly 3, the second pressing member 123 being threadedly connected to the installation block 122, and the second pressing member 123 being axially pressed against the support plate plug 121 at the large end of the support plate plug 121 to position the support plate plug 121.

[0081] In this embodiment, two gas permeable holes 34 are provided on one support plate assembly 3, i.e., two support plate plugs 121 and two second pressing members 123 are provided corresponding to one support plate sealing assembly.

[0082] Due to the low process requirement of the air vent hole 34 on the support plate assembly 3, the relative distance size of the two air vent holes 34 has deviation (usually the error is 1mm-3mm); in the embodiment, the large end of the support plate plug 121 extends radially outward to form an extension 1211, thereby increasing the end face area and the stress range of the plug, avoiding the failure to press the support plate plug 121 by the second pressing member 123 due to the distance size error of the two air vent holes 34; in addition, due to the production process of the air vent hole 34, there are flaws, and the support plate plug 121 may be inclined when embedded, based on this, the small end face of the second pressing member 123 is provided with an arc-shaped structure, thereby also adapting to the installation angle of the support plate plug 121.

[0083] In the embodiment, the gas chamber plugging assembly further comprises a pipe head hole sealing assembly,

[0084] The pipe head hole sealing assembly arranged corresponding to the position of the third pipe head 8 comprises:

[0085] A third screw 151 for connecting the threaded hole of the outer ring surface of the mounting plate 4 corresponding to the position of the third pipe head 8;

[0086] A third sealing member 152 in the form of a ring, the end of the third pipe head 8 is arranged to pass through the inner ring surface of the third sealing member 152, the thickness of the third sealing member 152 is adapted to the length of the third pipe head 8 extending from the mounting plate 4,

[0087] A fourth sealing member 153 arranged on the free end surface of the third sealing member 152 corresponding to the inner ring surface port position of the third sealing member 152,

[0088] A second pressing plate 154 arranged on the free end surface of the fourth sealing member 153, the small end of the third screw 151 is connected with the threaded hole of the outer ring surface of the mounting plate 4 in sequence through the second pressing plate 154 and the third sealing member 152, and the large end of the third screw 151 abuts against the free end surface of the second pressing plate 154, thereby pressing and fixing the pipe head hole sealing assembly;

[0089] The third pipe head 8 protrudes from the outer ring surface of the mounting plate 4, and the protruding length has an error of 1mm-4mm due to production error. Therefore, the conventional clamping means has the problem of excessive pipe head compression force leading to deformation or poor sealing. Based on this, the device sets a third sealing member 152 (in this embodiment, an annular gasket) with a thickness matching the protruding length of the pipe head at the position of the third pipe head 8. After the pipe head is arranged in the inner ring surface of the third sealing member 152, a fourth sealing member 153 (in this embodiment, a round gasket) is arranged on the third sealing member 152 to achieve the opening sealing of the third sealing member 152 and the sealing of the pipe head hole. The second pressing plate 154 is pressed on the fourth sealing member 153, and the third screw 151 passes through the second pressing plate 154 and the third sealing member 152 to be locked and fixed on the mounting plate 4 to complete the sealing and ensure the sealing effect while avoiding excessive pipe head compression force. It can be understood that a gasket is arranged between the third screw 151 and the second pressing plate 154 to ensure the sealing effect.

[0090] In this embodiment, the first pipe head 6 is arranged between the two air holes 34 of the support plate assembly 3. The pipe head hole sealing assembly arranged at the position of the first pipe head 6 includes:

[0091] The fourth screw 155 has a small end passing through the mounting block 122 and connected with the first threaded hole 61, and a large end abutting against the free end surface of the mounting block 122.

[0092] The fifth sealing member 156 (i.e. gasket) is arranged between the mounting end surface of the mounting block 122 and the end surface of the pipe head, and the small end of the fourth screw 155 passes through the mounting block 122 and the fifth sealing member 156 in sequence and is connected with the first threaded hole 61.

[0093] Based on the above technical solution, it can be understood that the pipe head hole sealing assembly arranged at the position of the first pipe head 6 is arranged in the same body as the support plate sealing assembly at this position, and the first threaded hole 61 is sealed by the screw and the fifth sealing member 156 while serving as a support and fixing mounting block 122.

[0094] Further, on the support plate assembly 3 without the first pipe head 6, the mounting block 122 includes an upper clamping block 1221 and a lower clamping block 1222 with a relative position that can be fixed. The upper clamping block 1221 and the lower clamping block 1222 are arranged on both sides of the support plate assembly 3 at the position of the air hole 34 of the support plate assembly 3. The sixth screw 1223 is arranged on both sides of the upper clamping block 1221, and the sixth screw 1223 is threadedly connected with the lower clamping block 1222 to position and clamp the mounting block 122 on the support plate assembly 3. The second pressing member 123 is threadedly connected with the upper clamping block 1221. In addition, the clamping surfaces of the upper clamping block 1221 and the lower clamping block 1222 are V-shaped in structure to increase the force contact surface with the outer wall of the support plate assembly 3, and the clamping is more firm.

[0095] In another aspect, the embodiment also provides a sealing detection method for the rear support shell, which is realized by the sealing detection device and includes the following contents.

[0096] The pipe head ports at both ends of the pipe of the target rear support shell are sealed by using the pipe sealing assembly, the first pressing member 113 is rotated through the force applying structure 114 to press the pipe head plug, the external test air pipe is connected to the air pipe connecting structure 115 of the first pressing member 113, the compressed gas with a pressure of 1-1.1 Mpa is used to pass in the compressed air, the air passing time is not less than 5 min, the target rear support shell is immersed in the liquid, if there is no bubble, it is judged to be qualified, if there is a bubble, the unqualified position of the sealing is judged according to the bubble position;

[0097] The holes of the air cavity 5 of the target rear support shell are sealed by using the support plate sealing assembly, the pipe head hole sealing assembly, the first sealing assembly and the second sealing assembly respectively, the plug seat 35 of the support plate assembly 3 is sealed and connected to the external test air pipe, the compressed gas with a pressure of 0.3-0.4 Mpa is used to pass in the compressed air, the air passing time is not less than 5 min, the target rear support shell is immersed in the liquid, if there is no bubble, it is judged to be qualified, if there is a bubble, the unqualified position of the sealing is judged according to the bubble position.

[0098] It should be understood that the above sealing and testing sequence can not be limited.

[0099] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing detection device for a rear support shell, the rear support shell comprising a seat assembly (2), a support plate assembly (3) and a mounting plate (4), characterized in that, the sealing detection device comprises a pipe plugging assembly for plugging each hole of the pipe of the rear support shell respectively and an air chamber plugging assembly for plugging each hole of the air chamber (5) of the rear support shell, the pipe plugging assembly comprises a plugging piece (111) for plugging the pipe head of the pipe of the rear support shell, a support block (112) having a positioning structure matched with the position of the pipe head and a first pressing piece (113) provided on the support block (112) for axial movement relative to the pipe head, the first pressing piece (113) being used for positioning and axially pressing the plugging piece (111) on the port of the pipe head; the air chamber plugging assembly comprises a support plate sealing assembly provided on the support plate assembly (3) for sealing the air permeable hole (34) of the support plate assembly (3), a first sealing assembly for sealing the first end face hole (21) of the first end face of the seat assembly (2) and a second sealing assembly for sealing the second end face hole (22) and the third end face hole (23) of the second end face of the seat assembly (2); the support plate sealing assembly comprises: a support plate plug (121) in a conical shape for plugging the air permeable hole (34), the small end of the support plate plug (121) having an outer diameter smaller than the hole diameter of the air permeable hole (34) and the large end of the support plate plug (121) having an outer diameter larger than the hole diameter of the air permeable hole (34), the large end of the support plate plug (121) extending radially outward to form an extension (1211) to increase the end face area; a mounting block (122) for fixed connection with the support plate assembly (3) and a second pressing piece (123) threadedly connected to the mounting block (122), the second pressing piece (123) axially pressing and positioning the support plate plug (121) at the large end of the support plate plug (121), the small end of the second pressing piece (123) having an arc-shaped structure to adapt to the installation angle of the support plate plug (121); the support plate assembly (3) has two air permeable holes (34) and the support plate sealing assembly is correspondingly provided with two support plate plugs (121) and two second pressing pieces (123).

2. The sealing detection device for the rear support housing according to claim 1, wherein the rear support housing is provided with a first pipe (51), a second pipe (52) and a third pipe (53), the first pipe (51) comprises a first pipe head (6) arranged on the outer side end face of the support plate assembly (3) and a second pipe head (7) arranged on the inner ring face of the seat assembly (2), the second pipe (52) comprises a third pipe head (8) arranged on the outer ring face of the mounting plate (4) and a fourth pipe head (9) arranged on the inner ring face of the seat assembly (2), and the third pipe (53) comprises a first pipe head (6) arranged on the outer side end face of the support plate assembly (3) and a fifth pipe head (10) arranged on the inner side end face of the support plate assembly (3), characterized in that, the blocking member (111) is a tapered pipe head blocking plug adapted to the port aperture of the pipe head, the first pressing member (113) is a screw rod structure threadedly connected to the support block (112), the small end of the first pressing member (113) is axially pressed to the pipe head blocking plug, and the large end of the first pressing member (113) has a force applying structure (114) for applying torque to the first pressing member (113) to axially move the first pressing member (113) on the support block (112) relative to the port of the pipe head; the first pressing member (113) of the pipe sealing assembly is threadedly connected to the corresponding pipe head blocking plug of the corresponding pipe, and the first pressing member (113) and the pipe head blocking plug are both hollow tubular, and the large end of the first pressing member (113) has a gas pipe connecting structure (115) for connecting with an external test gas pipe.

3. The sealing detection device for the rear support housing according to claim 2, wherein the pipe head has a first threaded hole (61), and characterized in that, the support block (112) is locked and fixed in the first threaded hole (61) of the corresponding pipe head by a positioning screw (1124); the support block (112) is L-shaped and has a first mounting face (1121) and a second mounting face (1122) perpendicular to each other, the first mounting face (1121) of the support block (112) threadedly connects the first pressing member (113) at the position of the port of the corresponding pipe head, and the second mounting face (1122) of the support block (112) abuts against the second end face of the seat assembly (2) and is provided with a positioning screw (1124) for connecting with the third end face hole (23) to be fixed to the second end face of the seat assembly (2).

4. The device for detecting the sealing property of a rear support housing according to claim 3, wherein the support block (112) is provided with a guide cavity (1123) adapted to the outer diameter of the large end of the pipe head blocking plug.

5. The sealing detection device for the rear support housing according to any one of claims 1-4, characterized in that, the first sealing assembly comprises a first screw (131) and a first sealing member (132) arranged corresponding to each of the first end face holes (21). The second sealing assembly comprises a second ring-shaped sealing member (141) which is adapted to the distribution positions of the second end face hole (22) and the third end face hole (23), and further comprises a first pressing plate (142) which is pressed on the second sealing member (141), and a second screw (143) which is screwed with the third end face hole (23), the small end of the second screw (143) passes through the first pressing plate (142) and the second sealing member (141) and is screwed with the third end face hole (23), and the large end of the second screw (143) is pressed on the first pressing plate (142).

6. The device for detecting the sealing property of a rear support housing according to claim 3, wherein The gas chamber plugging assembly further comprises a pipe head hole sealing assembly which is arranged corresponding to the position of the third pipe head (8) on the outer ring surface of the mounting plate (4) and the position of the first pipe head (6) on the outer side end surface of the support plate assembly (3), The pipe head hole sealing assembly arranged corresponding to the position of the third pipe head (8) comprises: a third screw (151) which is screwed with the threaded hole on the outer ring surface of the mounting plate (4) corresponding to the position of the third pipe head (8); a third ring-shaped sealing member (152) which is arranged corresponding to the inner ring surface of the third pipe head (8) and is adapted to the thickness of the third pipe head (8) which protrudes from the mounting plate (4), a fourth sealing member (153) which is arranged on the free end surface of the third sealing member (152) corresponding to the inner ring surface end port of the third sealing member (152), a second pressing plate (154) which is arranged on the free end surface of the fourth sealing member (153), the small end of the third screw (151) passes through the second pressing plate (154) and the third sealing member (152) in sequence and is connected with the threaded hole on the outer ring surface of the mounting plate (4), and the large end of the third screw (151) abuts against the free end surface of the second pressing plate (154) to press and fix the pipe head hole sealing assembly; The pipe head hole sealing assembly arranged corresponding to the position of the first pipe head (6) comprises: a fourth screw (155) which passes through the mounting block (122) and is connected with the first threaded hole (61), and the large end of the fourth screw (155) abuts against the free end surface of the mounting block (122); a fifth sealing member (156) which is arranged between the mounting end surface of the mounting block (122) and the end surface of the pipe head, and the small end of the fourth screw (155) passes through the mounting block (122) and the fifth sealing member (156) in sequence and is connected with the first threaded hole (61).

7. The device for detecting the sealing property of a rear support housing according to claim 1, wherein The mounting block (122) comprises upper and lower clamping blocks (1221, 1222) with fixed relative positions, the upper and lower clamping blocks (1221, 1222) are arranged at both sides of the air hole (34) of the support plate assembly (3), and the clamping surfaces of the upper and lower clamping blocks (1221, 1222) are V-shaped to increase the force contact surface with the outer wall of the support plate assembly (3).

8. A method for detecting the tightness of a rear support housing, characterized by, The detection method comprises: The pipe head port of the target rear support shell is sealed by using the pipe sealing assembly, the first compression member (113) is rotated through the force applying structure (114) to compress the pipe head plug, the air pipe connecting structure (115) of the first compression member (113) is connected to an external test air pipe to input compressed gas, the target rear support shell is immersed in liquid, if there is no bubble, it is judged to be qualified, if there is a bubble, the unqualified position of the sealing performance is judged according to the bubble position; The holes of the air chamber (5) of the target rear support shell are sealed by using the support plate sealing assembly, the pipe head hole sealing assembly, the first sealing assembly and the second sealing assembly respectively, the plug seat (35) of the support plate assembly (3) is sealed and connected to an external test air pipe to input compressed gas, the target rear support shell is immersed in liquid, if there is no bubble, it is judged to be qualified, if there is a bubble, the unqualified position of the sealing performance is judged according to the bubble position.

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