Casing static pressure comprehensive loading test structure

Abstract

The application discloses a kind of machine case static pressure comprehensive loading test structures, comprising: device base, fixedly arranged on the device base on the machine case to be tested, rotating bearing cylinder group, sealing device and limiting device.The lower end of rotating bearing cylinder group is connected to the inner and outer walls of the open ring cavity of the machine case to be tested, to form inner pressure cavity and outer pressure cavity.Sealing device is arranged in inner pressure cavity and outer pressure cavity, to seal the openings of both respectively, and to make the inner and outer walls of rotating bearing cylinder group and the machine case to be tested deform independently.Limiting device is arranged on the device base and connected to the sealing device, to limit the sealing device in the corresponding inner pressure cavity and outer pressure cavity.The application can effectively avoid the load on mounting surfaces A, B and C being transmitted to each other due to the sealing device, so that the deformation of the inner and outer cavities does not interfere with each other, thereby ensuring the authenticity of the load state results of the machine case to be tested, and the authenticity of the test is guaranteed, so as to ensure the correct stress state of the machine case to be tested.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine casing static pressure integrated comprehensive loading test, in particular, relates to a casing static pressure integrated comprehensive loading test structure. BACKGROUND

[0002] The casing is a load-bearing part of the engine, is an important part of supporting the rotor and fixed stator, and is also an important load-bearing component of the engine, which bears the engine thrust, inertia force, torque and other dynamic loads, and also bears the internal gas flow pressure load. According to the requirements of GJB242A, the static test including pressure load must be carried out on the casing.

[0003] In the static test of the casing, the engine thrust, inertia force, torque and other dynamic loads are applied to the mounting edge of the casing, and at the same time, pressure load is applied to the inside of the casing. For the casing with annular cavity structure and pressure state, when the test pressure is applied to the annular cavity, the inner wall and the outer wall of the annular cavity need to be solved while bearing the pressure, and their independent deformation under the concentrated force load needs to be ensured, and the problem of mutual interference of the inner and outer cavities due to sealing structure and other reasons cannot be caused.

[0004] At present, there are two mature sealing methods for annular cavity. Taking the static pressure test of a certain engine casing as an example, the casing structure is shown in Figure 1 According to the test load requirements, the mounting edge A of the casing is constrained, the mechanical load is applied to the mounting edge B, including axial force, shear force and bending moment; the pressure load is applied to the P cavity, and the Q cavity pressure is standard atmospheric pressure; the detailed bearing schematic diagram is shown in Figure 1 In the existing test implementation scheme, the axial force, shear force and bending moment are applied by the concentrated force loading method, and the pressure load is applied by injecting hydraulic oil into the casing, and the loading schematic diagram is shown in Figure 1 In the sealing method of this scheme, the pressure is closed by the annular cavity outer cylinder adapter, the annular cavity inner cylinder adapter and a ring-shaped plate, wherein the design of the annular cavity outer cylinder adapter, the annular cavity inner cylinder adapter and the ring-shaped plate makes the casing not produce additional axial load under the pressure load, and the O-shaped sealing rings 1 and 2 are placed at the cooperation place of the annular cavity outer cylinder adapter and the ring-shaped plate, and the O-shaped sealing rings 3 and 4 are placed at the cooperation place of the annular cavity inner cylinder adapter and the ring-shaped plate to realize the sealing of each cooperation place.

[0005] Another sealing method adopts floating sealing technology, such as Figure 2As shown, it comprises a first annular plate, a second annular plate, four pins, several O-shaped sealing rings and other fasteners. The sealing mode is as follows: the first annular plate does not contact and seal with the annular cavity inner cylinder adapter, and a 4mm gap is left between them; the first annular plate and the second annular plate are connected by several evenly distributed bolts, and the nuts 1 are manually tightened during assembly; the gap between the first annular plate and the annular cavity outer cylinder adapter is sealed by O-shaped sealing rings 1 and 2, the gap between the second annular plate and the annular cavity inner cylinder adapter is sealed by O-shaped sealing rings 3 and 4, the gap between the first annular plate and the second annular plate is sealed by O-shaped sealing rings 15, 16 (17, 18, 19), and the gap between the second annular plate and the bolt is sealed by O-shaped sealing rings 7, 8 (9, 10, 11, 12, 13, 14); all O-shaped ring groove types are designed according to the standard.

[0006] For the first traditional sealing mode, due to the shear force and bending moment load borne by the casing, there is a transverse displacement at the joint between the annular cavity outer cylinder adapter and the annular plate under load. Since all joints are sealed by O-shaped sealing ring groove type, the transverse displacement of the casing under load will compress the O-shaped sealing rings 1, 2 and 3, 4. The size relationship between the transverse displacement and the compression amount of the O-shaped sealing ring directly affects the load transmission. When the load is large, the elasticity of the O-shaped sealing ring is not enough to offset the deformation between the inner and outer walls. At this time, a part of the load on the mounting surface B will be transmitted to the inner wall of the annular cavity through the annular plate, thereby reducing the load on the mounting surface B, and the mounting surface A receives additional load from B through the annular plate, so that the load state result of the test piece deviates from the real working condition, and the authenticity of the test cannot be guaranteed.

[0007] For the floating sealing mode, the tightening torque of the four screws directly affects the friction force between the upper and lower annular plates, which is difficult to control during assembly, especially under pressure load. The friction force between the second annular plate and the first annular plate restricts the normal deformation of the casing. The sealing mode has small gaps everywhere, and the second annular plate and the inner wall of the annular cavity use double sealing ring sealing form, which restricts the bending deformation of the inner wall of the annular cavity. When the casing bears a large deformation, it cannot be applied. SUMMARY

[0008] The present application provides a casing static pressure comprehensive loading test structure to solve the technical problem that the load state result of the test piece deviates from the real working condition, and the authenticity of the test cannot be guaranteed.

[0009] The technical scheme adopted by the present application is as follows:

[0010] The application discloses a kind of machine case static pressure comprehensive loading test structures, comprising: the device base of installation support function, fixedly arranged on the device base on the machine case to be tested, the rotary bearing cylinder group for rotary bearing the force suffered by the machine case to be tested during test, sealing device and limiting device;The lower end of rotary bearing cylinder group is connected to the inner and outer wall of the open ring cavity on the machine case to be tested respectively, to form the inner pressure chamber and outer pressure chamber that are arranged in inner and outer sleeve and open respectively at upper end;Sealing device is arranged in inner pressure chamber and outer pressure chamber respectively, to seal the opening of inner pressure chamber and outer pressure chamber respectively, and make the independent deformation of rotary bearing cylinder group and the inner and outer wall of machine case to be tested;Limiting device is arranged on the device base and is connected with sealing device, to limit sealing device in corresponding arranged inner pressure chamber and outer pressure chamber.

[0011] Further, the device base includes a mounting base plate for connecting with the test loading device, and a support cylinder fixedly arranged on the mounting base plate and in a ring shape, and the bottom end of the machine case to be tested is fixedly arranged on the support cylinder, and the opening of the open ring cavity arranged thereon faces upward;Rotary bearing cylinder group includes adapter inner cylinder and adapter outer cylinder arranged in coaxial and inner and outer sleeve;The lower end of adapter inner cylinder is fixed with the top end of the inner ring wall of open ring cavity, so that the inner cavity of adapter inner cylinder forms inner pressure chamber;The lower end of adapter outer cylinder is fixed with the top end of the outer ring wall of open ring cavity, so that the ring cavity between adapter outer cylinder and adapter inner cylinder and open ring cavity are communicated to form outer pressure chamber.

[0012] Further, the sealing device includes inner sealing assembly and outer sealing assembly for sealing;The inner sealing assembly is circular, arranged in inner pressure chamber, and sealingly connected with the inner cylinder surface of adapter inner cylinder to seal inner pressure chamber, and the inner sealing assembly is also connected with limiting device;The outer sealing assembly is annular, sleeved on the outer circle of adapter inner cylinder and located in outer pressure chamber, and sealingly connected with the outer cylinder surface of adapter inner cylinder and the inner cylinder surface of adapter outer cylinder respectively to seal outer pressure chamber, and the outer sealing assembly is also connected with limiting device.

[0013] Further, the outer sealing assembly includes upper annular plate and lower annular plate arranged in upper and lower spaces and connected, middle annular plate movably arranged between upper annular plate and lower annular plate, and connecting member for movably arranging middle annular plate;The upper annular plate and the lower annular plate are both annular, and the inner ring surface of the two is arranged in space with the outer cylinder surface of adapter inner cylinder, and the outer ring surface of the two is sealingly connected with the inner cylinder surface of adapter outer cylinder through first sealing group;The inner ring surface of middle annular plate is sealingly connected with the outer cylinder surface of adapter inner cylinder through second sealing group;The connecting member is arranged between middle annular plate and upper annular plate and lower annular plate, so that middle annular plate is movably arranged relative to upper annular plate and lower annular plate.

[0014] Further, the upper surface of the lower annular plate is provided with a lower annular cavity which is concave and annular, and the upper surface of the middle annular plate is provided with an upper annular cavity which is concave and annular; the connecting member comprises two layers of steel balls arranged in the upper annular cavity and the lower annular cavity respectively, and a retainer for uniformly and circumferentially spacing the steel balls in each layer.

[0015] Further, the outer sealing assembly further comprises a third sealing group arranged between the middle annular plate and the upper and lower annular plates; the inner annular surface of both the upper and lower annular plates and the outer cylindrical surface of the adapter inner cylinder have a radial gap of 5-15 mm; the inner annular surface of the middle annular plate and the outer cylindrical surface of the adapter inner cylinder, the outer annular surface of both the upper and lower annular plates and the inner cylindrical surface of the adapter outer cylinder, and the space between the middle annular plate and the upper and lower annular plates all have a gap of 1-5 mm.

[0016] Further, the inner sealing assembly comprises an inner sealing plate and a fourth sealing group arranged on the outer circle of the inner sealing plate, and the inner sealing plate is sealingly connected to the inner cylindrical surface of the adapter inner cylinder through the fourth sealing group.

[0017] Further, the limiting device comprises an outer limiting assembly for limiting the action of the outer sealing assembly and an inner limiting assembly for limiting the action of the inner sealing assembly; the outer limiting assembly is arranged around the outside of the adapter outer cylinder, and the lower end thereof is fixedly connected to the device base, and the opposite upper end thereof presses and abuts against the outer sealing assembly, so as to prevent the outer sealing assembly from moving upward under the pressure in the outer pressure chamber and to ensure the free deformation of the adapter outer cylinder; the inner limiting assembly is arranged in the adapter inner cylinder, and the upper end of the inner limiting assembly is connected to the inner sealing assembly, and the opposite lower end thereof is sequentially arranged through the adapter inner cylinder and the to-be-tested cartridge and then connected to the device base, so as to prevent the inner sealing assembly from moving upward under the pressure in the inner pressure chamber and to ensure the free deformation of the adapter inner cylinder.

[0018] Further, the outer limiting assembly comprises a pressing ring for pressing the outer sealing assembly, a loading plate for loading force, and a plurality of first pull rod members for limiting connection; the pressing ring is sleeved outside the adapter inner cylinder and abuts against the outer sealing assembly at the lower end; the loading plate is sleeved outside the adapter inner cylinder and located above the pressing ring, and the upper end of the pressing ring is fixedly connected to the loading plate; the plurality of first pull rod members are arranged at intervals along the circumference of the adapter outer cylinder, and the upper end of each first pull rod member is movably connected to the loading plate, and the opposite lower end is movably connected to the device base.

[0019] Further, the inner limiting assembly comprises a second pull rod member, and the upper end of the second pull rod member is fixedly connected to the inner sealing assembly, and the opposite lower end is movably connected to the device base after being sequentially arranged through the adapter inner cylinder and the to-be-tested cartridge.

[0020] The present application has the following advantages:

[0021] This invention addresses the static pressure integrated loading test of an engine casing with an annular cavity (open annular cavity in this invention) structure and pressure conditions. It proposes a static pressure integrated loading test structure for the casing. In this structure, the lower end of a bearing sleeve assembly is connected to the inner and outer walls of the open annular cavity on the test casing, forming an inner and outer pressure cavity with interlocking inner and outer sleeves and open upper ends. A sealing device, installed and coordinated with the inner and outer pressure cavities, forms a sealed inner and outer pressure cavity, meeting the requirement of applying test pressure within the annular cavity. Furthermore, the sealing device allows for independent deformation of the bearing sleeve assembly and the inner and outer walls of the test casing, ensuring independent deformation of the inner and outer walls of the annular cavity under mechanical load. The deformation effectively prevents the loads on mounting surfaces A, B, and C from being transmitted to each other due to the sealing device, ensuring that the deformation of the inner and outer cavities does not interfere with each other. This guarantees the authenticity of the load state of the test casing and ensures the authenticity of the test assessment, thereby guaranteeing the correct stress state of the test casing. The structure of this invention has been successfully applied to the integrated static pressure loading fatigue test of an engine casing, contributing to the smooth progress of model development. Moreover, the use of this sealing device can very conveniently solve the problem of interference between the inner and outer walls of the casing annular cavity seal, improve the accuracy of test loading, shorten the test cycle, and improve work efficiency. This sealing device has also been widely applied to the static pressure structural strength test of aero-engine components.

[0022] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of a traditional sealing technology solution for the casing;

[0025] Figure 2 This is a schematic diagram of the floating seal technology solution for the casing;

[0026] Figure 3 This is a cross-sectional front view schematic diagram of the casing static pressure integrated loading test structure according to a preferred embodiment of the present invention;

[0027] Figure 4 yes Figure 3 A magnified schematic diagram of the central part of the structure;

[0028] Figure 5 yes Figure 3 A cross-sectional front view of the inner and outer sealing components.

[0029] Legend

[0030] 10, device base; 11, mounting plate; 12, support cylinder; 20, test machine case; 201, open ring cavity; 30, rotating bearing cylinder group; 31, rotating inner cylinder; 32, rotating outer cylinder; 401, inner pressure cavity; 402, outer pressure cavity; 50, inner sealing assembly; 51, inner sealing plate; 52, fourth sealing group; 60, outer sealing assembly; 61, upper annular plate; 62, lower annular plate; 63, middle annular plate; 630, exhaust hole; 64, connecting member; 641, steel ball; 642, retainer; 65, first sealing group; 66, second sealing group; 67, third sealing group; 70, outer limiting assembly; 71, pressure ring; 72, loading plate; 73, first pull rod member; 731, first pull rod; 732, knuckle bearing; 733, bearing support; 80, inner limiting assembly. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0032] Reference Figure 3 The preferred embodiment of the present application provides a machine case static pressure comprehensive loading test structure, comprising: a device base 10 for installation and support, a test machine case 20 fixedly arranged on the device base 10, a rotating bearing cylinder group 30 for rotating bearing the force acting on the test machine case 20 during the test, a sealing device, and a limiting device. The lower end of the rotating bearing cylinder group 30 is connected to the inner and outer walls of the open ring cavity 201 of the test machine case 20, respectively, to form an inner pressure cavity 401 and an outer pressure cavity 402 which are arranged in a sleeve combination and have openings at the upper end, respectively. The sealing device is arranged in the inner pressure cavity 401 and the outer pressure cavity 402, respectively, to seal the openings of the inner pressure cavity 401 and the outer pressure cavity 402, respectively, and to make the inner and outer walls of the rotating bearing cylinder group 30 and the test machine case 20 deform independently. The limiting device is arranged on the device base 10 and connected to the sealing device, for limiting the sealing device in the corresponding arranged inner pressure cavity 401 and outer pressure cavity 402.

[0033] The application is directed to the static pressure integrated comprehensive loading test of the engine case with the annular cavity (open annular cavity 201 in the application) structure and pressure state, and proposes a case static pressure comprehensive loading test structure, in which, the inner and outer walls of the upper open annular cavity 201 of the case to be tested 20 are connected by the lower end of the rotating bearing cylinder group 30 respectively, so as to form the inner pressure cavity 401 and the outer pressure cavity 402 which are arranged in a nested manner and open at the upper end respectively, and then the inner pressure cavity 401 and the outer pressure cavity 402 are formed in a sealed manner through the installation of the sealing device and the inner pressure cavity 401 and the outer pressure cavity 402, so as to meet the demand of applying test pressure in the annular cavity; in addition, the sealing device can also make the inner and outer walls of the rotating bearing cylinder group 30 and the case to be tested 20 deform independently, that is, to ensure the independent deformation of the inner and outer walls of the annular cavity under mechanical load, thereby effectively avoiding the mutual transmission of the loads on the mounting surfaces A, B and C due to the sealing device, so as to make the deformation of the inner and outer cavities not interfere with each other, and then to ensure the authenticity of the load state results of the case to be tested 20 and the authenticity of the test examination, so as to ensure the correct stress state of the case to be tested 20; the structure of the application has been successfully applied to the static pressure integrated comprehensive loading fatigue test of the engine case, and has made contributions to the smooth progress of the type development, and the sealing device can very conveniently solve the interference problem of the inner and outer walls of the annular cavity of the case, improve the test loading accuracy, shorten the test cycle, improve the work efficiency, and the sealing device has been popularized and applied to the static pressure structure strength test of the aero-engine parts.

[0034] Optionally, as shown in Figure 3 , the device base 10 includes a mounting bottom plate 11 for connecting with the test loading device, and a support cylinder 12 fixedly arranged on the mounting bottom plate 11 in a ring shape, and the bottom end of the case to be tested 20 is fixedly arranged on the support cylinder 12, and the opening of the open annular cavity 201 arranged thereon faces upward. In the structure of the application, the device base 10 is simple in structure and easy to process and manufacture, and the case to be tested 20 is simple to install and support and easy to disassemble and assemble. Figure 3 , the rotating bearing cylinder group 30 includes a rotating inner cylinder 31 and a rotating outer cylinder 32 arranged in a nested manner. The lower end of the rotating inner cylinder 31 is fixed with the top end of the inner ring wall of the open annular cavity 201, so that the inner cavity of the rotating inner cylinder 31 forms the inner pressure cavity 401. The lower end of the rotating outer cylinder 32 is fixed with the top end of the outer ring wall of the open annular cavity 201, so that the annular cavity between the rotating outer cylinder 32 and the rotating inner cylinder 31 and the open annular cavity 201 are communicated to form the outer pressure cavity 402. In the structure of the application, the rotating bearing cylinder group 30 is simple in structure and easy to process and manufacture, and the rotating bearing cylinder group 30 is simple in connection mode with the case to be tested 20, so as to easily form the inner pressure cavity 401 and the outer pressure cavity 402 which open at the top end, and then to make the overall structure simple.

[0035] Optionally, as shown in Figure 3As shown, the sealing device comprises an inner sealing assembly 50 and an outer sealing assembly 60. The inner sealing assembly 50 is circular, arranged in the inner pressure cavity 401, and sealingly connected with the inner cylinder surface of the adapter inner cylinder 31 to seal the inner pressure cavity 401. The inner sealing assembly 50 is also connected with the limiting device. The outer sealing assembly 60 is annular, arranged on the outer circle of the adapter inner cylinder 31 and located in the outer pressure cavity 402, and sealingly connected with the outer cylinder surface of the adapter inner cylinder 31 and the inner cylinder surface of the adapter outer cylinder 32 to seal the outer pressure cavity 402. The outer sealing assembly 60 is also connected with the limiting device.

[0036] As shown in the optional solution, Figure 4 and Figure 5 The outer sealing assembly 60 comprises an upper annular plate 61 and a lower annular plate 62 arranged in an upper and lower manner and connected with each other, a middle annular plate 63 movably arranged between the upper annular plate 61 and the lower annular plate 62, and a connecting member 64 for movably arranging the middle annular plate 63. The upper annular plate 61 and the lower annular plate 62 are both annular, and the inner annular surfaces thereof are arranged in a spaced manner with the outer cylinder surface of the adapter inner cylinder 31. The outer annular surfaces thereof are sealingly connected with the inner cylinder surface of the adapter outer cylinder 32 through a first sealing group 65. The inner annular surface of the middle annular plate 63 is sealingly connected with the outer cylinder surface of the adapter inner cylinder 31 through a second sealing group 66. The connecting member 64 is arranged between the middle annular plate 63 and the upper annular plate 61 and the lower annular plate 62, so as to movably arrange the middle annular plate 63 relative to the upper annular plate 61 and the lower annular plate 62. As shown in the optional solution, Figure 5 Since the inner annular surfaces of the upper annular plate 61 and the lower annular plate 62 are arranged in a spaced manner with the outer cylinder surface of the adapter inner cylinder 31, and the outer annular surfaces thereof are sealingly connected with the inner cylinder surface of the adapter outer cylinder 32 through the first sealing group 65, and the inner annular surface of the middle annular plate 63 is sealingly connected with the outer cylinder surface of the adapter inner cylinder 31 through the second sealing group 66, and the middle annular plate 63 is movably arranged relative to the upper annular plate 61 and the lower annular plate 62 through the connecting member 64, the opening of the outer pressure cavity 402 is well sealed, and the adapter inner cylinder 31 and the adapter outer cylinder 32 are independent of each other, and the deformation thereof does not interfere with each other, thereby ensuring the independent deformation of the inner and outer walls of the casing on both sides of the open annular cavity 201.

[0037] In the specific implementation of the optional solution, as shown in the optional solution, Figure 5 The first sealing group 65 comprises a plurality of first sealing rings arranged in a spaced manner along the axial direction, and each first sealing ring is arranged on the outer circle of the corresponding upper annular plate 61 and lower annular plate 62. Similarly, the second sealing group 66 only comprises one second sealing ring, which is arranged on the outer circle of the middle annular plate 63. The single-layer sealing ring sealing form is adopted between the middle annular plate 63 and the adapter inner cylinder 31, and the adapter inner cylinder 31 only contacts the O-shaped ring, so as to ensure that the middle annular plate 63 does not generate additional load on the adapter inner cylinder 31 when the adapter inner cylinder 31 is bent and deformed.

[0038] In the embodiment of the optional solution, as shown in Figure 4 the upper surface of the lower annular plate 62 is provided with a concave annular lower ring cavity, and the upper surface of the middle annular plate 63 is provided with a concave annular upper ring cavity. The connecting member 64 includes two layers of steel balls 641 arranged in the upper ring cavity and the lower ring cavity, and a retainer 642 for uniformly and circumferentially spacing the steel balls in each layer of the steel balls 641. In the structure of the connecting member 64 of the present application, the upper annular plate 61, the middle annular plate 63, and the lower annular plate 62 are connected by the steel balls, which are point contacts with small surface friction. The retainer for the position of the steel ball can make the steel ball always uniformly distributed along the circumference when the middle annular plate 63 moves, and the phenomenon of unbalanced load does not occur.

[0039] In the optional solution, the outer sealing assembly 60 further includes a third sealing group 67 arranged between the middle annular plate 63 and the upper annular plate 61 and the lower annular plate 62. In the embodiment of the optional solution, as shown in Figure 4 the third sealing group 67 includes two third sealing rings arranged on the lower annular plate 62 and the middle annular plate 63, respectively. In the structure of the present application, the double-layer steel balls and the double-layer third sealing rings are arranged on the middle annular plate 63 and the lower annular plate 62, which facilitates the rapid assembly and disassembly of the outer sealing assembly 60.

[0040] In the optional solution, as shown in Figure 4 the inner annular surface of both the upper annular plate 61 and the lower annular plate 62 has a radial gap of 5mm-15mm with the outer cylindrical surface of the adapter inner cylinder 31, which ensures sufficient movement space for the middle annular plate 63. As shown in Figure 4 the inner annular surface of the middle annular plate 63 has a gap of 1mm-5mm with the outer cylindrical surface of the adapter inner cylinder, the outer annular surface of both the upper annular plate 61 and the lower annular plate 62 has a gap of 1mm-5mm with the inner cylindrical surface of the adapter outer cylinder 32, and the middle annular plate 63 has a gap of 1mm-5mm with the upper annular plate 61 and the lower annular plate 62. This ensures stable sealing at the corresponding positions and independent deformation of the adapter inner cylinder 31 and the adapter outer cylinder 32, avoids affecting the other one through the outer sealing assembly 60 when one of the adapter inner cylinder 31 and the adapter outer cylinder 32 deforms, and thus realizes independent deformation of the inner and outer walls of the machine case on both sides of the open ring cavity 201.

[0041] In the optional solution, as shown in Figure 5 the middle annular plate 63 is further provided with a plurality of exhaust holes 630, which can ensure that the air in the outer pressure cavity 402 is completely discharged when oil is injected into the inside of the test machine case 20.

[0042] Compared with the prior art, the sealing device of the application adopts a three-layer sealing structure design, i.e. the upper annular plate 61, the lower annular plate 62 and the middle annular plate 63, the layers are in contact through steel balls, the friction between the layers is reduced; the middle annular plate 63 is clamped between the upper annular plate 61 and the lower annular plate 62, and the gap between the two is 1mm-5mm, which can ensure that the adapter inner cylinder 31 and the adapter outer cylinder 32 will not interfere when they are bent and deformed, and the application range is increased; the upper annular plate 61 and the lower annular plate 62 are tightened by screws, and the tightening torque of the bolts does not affect the friction between the annular plates, so the device can be quickly assembled and disassembled.

[0043] Optionally, as shown in Figure 3 the inner sealing assembly 50 includes an inner sealing plate 51 and a fourth sealing group 52 arranged on the outer circle of the inner sealing plate 51, and the inner sealing plate 51 is sealingly connected to the inner cylinder surface of the adapter inner cylinder 31 through the fourth sealing group 52. The structure of the inner sealing assembly 50 is simple, easy to process and manufacture, and easy to disassemble and assemble. In this optional solution, the fourth sealing group 52 includes a plurality of fourth sealing rings arranged along the axial direction and spaced apart from each other, and each fourth sealing ring is arranged on the outer circle of the inner sealing plate 51.

[0044] Optionally, as shown in Figure 3 the limiting device includes an outer limiting assembly 70 for limiting the movement of the outer sealing assembly 60 and an inner limiting assembly 80 for limiting the movement of the inner sealing assembly 50. The outer limiting assembly 70 surrounds the outside of the adapter outer cylinder 32, and its lower end is fixedly connected to the device base 10, and its opposite upper end presses and abuts against the outer sealing assembly 60, so as to prevent the outer sealing assembly 60 from moving upward under the pressure in the outer pressure chamber 402, and to ensure the free deformation of the adapter outer cylinder 32. The inner limiting assembly 80 is arranged in the adapter inner cylinder 31, and the upper end of the inner limiting assembly 80 is connected to the inner sealing assembly 50, and the opposite lower end of the inner limiting assembly 80 is connected to the device base 10 after penetrating the adapter inner cylinder 31 and the machine chamber 20 to be tested, so as to prevent the inner sealing assembly 50 from moving upward under the pressure in the inner pressure chamber 401, and to ensure the free deformation of the adapter inner cylinder 31.

[0045] In this optional solution, as shown in Figure 3 the outer limiting assembly 70 includes a pressing ring 71 for pressing the outer sealing assembly 60, a loading plate 72 for loading force, and a plurality of first pull rod members 73 for connecting and limiting. The pressing ring 71 is sleeved outside the adapter inner cylinder 31 and abuts against the outer sealing assembly 60 at the lower end. The loading plate 72 is sleeved outside the adapter inner cylinder 31 and located above the pressing ring 71, and the upper end of the pressing ring 71 is fixedly connected to the loading plate 72. A plurality of first pull rod members 73 are arranged along the circumference of the adapter outer cylinder 32 and spaced apart from each other, and the upper end of each first pull rod member 73 is movably connected to the loading plate 72, and the opposite lower end is movably connected to the device base 10. When working, the loading plate 72 is forced to press the outer sealing assembly 60 by the pressing ring 71.

[0046] In a specific embodiment of this alternative, as shown in Figure 3 The first pull rod member 73 comprises a first pull rod 731, joint bearings 732 connected to both ends of the first pull rod 731, and a bearing support 733 for mounting one of the joint bearings 732. The first pull rod 731 is vertically arranged, with the joint bearing 732 at its upper end connected to the loading plate 72, and the oppositely arranged joint bearing 732 at its lower end arranged on the bearing support 733, which is fixedly connected to the device base 10. In this embodiment, the additional axial force generated by the entire device due to pressure is transmitted to the device base 10 through the compression ring 71 and the plurality of first pull rod members 73. The joint bearings 732 arranged at both ends of the first pull rod 731 are connected through two hinged connections, which ensures that the entire sealing device can move freely in the transverse direction.

[0047] In this alternative, as shown in Figure 3 The inner limiting assembly 80 comprises a second pull rod member, the upper end of which is fixedly connected to the inner sealing assembly 50, and the opposite lower end is movably connected to the device base 10 after passing through the adapter inner cylinder 31 and the test chamber 20 to be tested. In a specific embodiment of this alternative, as shown in Figure 3 The second pull rod member comprises a vertically arranged second pull rod, a locking nut arranged on the outer circle of the upper end of the second pull rod, a joint bearing connected to the bottom end of the second pull rod, and a bearing support for mounting the joint bearing. The upper end of the second pull rod is screwed to the locking nut after passing through the inner sealing assembly 50; the bearing support is fixedly connected to the device base 10. This structure is also used to ensure that the entire sealing device can move freely in the transverse direction.

[0048] The above only describes the preferred embodiments of the present application and is not intended 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 principles of the present application shall be included in the protection scope of the present application.

Claims

1. A test structure for synthetic loading of a nacelle by static pressure, characterized in that, The utility model relates to a device for testing the mechanical properties of a machine case, comprising: a device base (10) for mounting support, a machine case (20) to be tested fixedly arranged on the device base (10), a bearing cylinder group (30) for bearing the force acting on the machine case (20) during testing, a sealing device and a limiting device; the lower end of the bearing cylinder group (30) is connected to the inner and outer walls of the open ring cavity (201) of the machine case (20) to be tested, forming an inner pressure chamber (401) and an outer pressure chamber (402) arranged in an inner and outer sleeve combination and respectively open at the upper end; the sealing device is arranged in the inner pressure chamber (401) and the outer pressure chamber (402) to respectively seal the openings of the inner pressure chamber (401) and the outer pressure chamber (402) and make the inner and outer walls of the bearing cylinder group (30) and the machine case (20) to be tested deform independently; the limiting device is arranged on the device base (10) and connected to the sealing device to limit the sealing device in the corresponding inner pressure chamber (401) and outer pressure chamber (402); the device base (10) comprises a mounting base plate (11) for connecting with a test loading device and a support cylinder (12) fixedly arranged on the mounting base plate (11) in a ring shape, and the bottom end of the machine case (20) to be tested is fixedly arranged on the support cylinder (12) with the opening of the open ring cavity (201) arranged thereon facing upward; the bearing cylinder group (30) comprises a transfer inner cylinder (31) and a transfer outer cylinder (32) arranged in an inner and outer sleeve combination; the lower end of the transfer inner cylinder (31) is fixed to the top end of the inner ring wall of the open ring cavity (201) to form the inner pressure chamber (401) in the inner cavity of the transfer inner cylinder (31); the lower end of the transfer outer cylinder (32) is fixed to the top end of the outer ring wall of the open ring cavity (201) to form the outer pressure chamber (402) in the ring cavity between the transfer outer cylinder (32) and the transfer inner cylinder (31) and the open ring cavity (201); the sealing device comprises an inner sealing assembly (50) and an outer sealing assembly (60) for sealing; the inner sealing assembly (50) is circular, arranged in the inner pressure chamber (401) and sealingly connected to the inner cylinder surface of the transfer inner cylinder (31) to seal the inner pressure chamber (401), and further connected to the limiting device; the outer sealing assembly (60) is annular, arranged on the outer circle of the transfer inner cylinder (31) in the outer pressure chamber (402) and sealingly connected to the outer cylinder surface of the transfer inner cylinder (31) and the inner cylinder surface of the transfer outer cylinder (32) to seal the outer pressure chamber (402), and further connected to the limiting device. The outer sealing assembly (60) comprises upper and lower annular plates (61) and (62) arranged in space and connected, a middle annular plate (63) movably arranged between the upper and lower annular plates (61) and (62), and a connecting member (64) for movably arranging the middle annular plate (63); the upper and lower annular plates (61) and (62) are annular, and the inner annular surfaces thereof are arranged in space with the outer cylinder surface of the adapter inner cylinder (31), and the outer annular surfaces thereof are sealingly connected with the inner cylinder surface of the adapter outer cylinder (32) through a first sealing group (65); the inner annular surface of the middle annular plate (63) is sealingly connected with the outer cylinder surface of the adapter inner cylinder (31) through a second sealing group (66); and the connecting member (64) is arranged between the middle annular plate (63) and the upper and lower annular plates (61) and (62) to movably arrange the middle annular plate (63) relative to the upper and lower annular plates (61) and (62); The limiting device comprises an outer limiting assembly (70) for limiting the movement of the outer sealing assembly (60) and an inner limiting assembly (80) for limiting the movement of the inner sealing assembly (50); the outer limiting assembly (70) is arranged outside the adapter outer cylinder (32), and the lower end thereof is fixedly connected with the device base (10), and the opposite upper end thereof presses and abuts against the outer sealing assembly (60) to prevent the outer sealing assembly (60) from moving upward under the pressure in the outer pressure chamber (402) and to ensure the free deformation of the adapter outer cylinder (32); the inner limiting assembly (80) is arranged in the adapter inner cylinder (31), and the upper end of the inner limiting assembly (80) is connected with the inner sealing assembly (50), and the opposite lower end thereof is connected with the device base (10) after sequentially penetrating the adapter inner cylinder (31) and the machine case (20) to be tested to prevent the inner sealing assembly (50) from moving upward under the pressure in the inner pressure chamber (401) and to ensure the free deformation of the adapter inner cylinder (31).

2. The machine case static pressure comprehensive loading test structure according to claim 1, characterized in that the upper surface of the lower annular plate (62) is provided with a lower annular cavity which is concave and annular, and the upper surface of the middle annular plate (63) is provided with an upper annular cavity which is concave and annular; the connecting member (64) comprises two layers of steel balls arranged in the upper annular cavity and the lower annular cavity, and a retainer for uniformly and circumferentially spacing the steel balls in each layer.

3. The machine case static pressure comprehensive loading test structure according to claim 1, characterized in that the outer sealing assembly (60) further comprises a third sealing group (67) arranged between the middle annular plate (63) and the upper and lower annular plates (61) and (62); the inner annular surfaces of the upper and lower annular plates (61) and (62) and the outer cylinder surface of the adapter inner cylinder (31) have a radial gap of 5mm-15mm; the inner annular surface of the middle annular plate (63) and the outer cylinder surface of the adapter inner cylinder, the outer annular surfaces of the upper and lower annular plates (61) and (62) and the inner cylinder surface of the adapter outer cylinder (32), and the middle annular plate (63) and the upper and lower annular plates (61) and (62) all have a gap of 1mm-5mm.

4. The casing static pressure comprehensive loading test structure according to claim 1, characterized in that, the inner sealing assembly (50) comprises an inner sealing plate (51) and a fourth sealing group (52) arranged on the outer circle of the inner sealing plate (51), and the inner sealing plate (51) is sealingly connected with the inner cylinder surface of the adapter inner cylinder (31) through the fourth sealing group (52).

5. The casing static pressure comprehensive loading test structure according to claim 1, characterized in that, the outer limiting assembly (70) comprises a pressing ring (71) for pressing the outer sealing assembly (60), a loading plate (72) for loading force, and a plurality of first pull rod members (73) for connecting and limiting; the pressing ring (71) is sleeved on the outer side of the adapter inner cylinder (31) and abuts against the outer sealing assembly (60) at the lower end; the loading plate (72) is sleeved on the outer side of the adapter inner cylinder (31) and located above the pressing ring (71), and the upper end of the pressing ring (71) is fixedly connected with the loading plate (72); the plurality of first pull rod members (73) are arranged in the circumferential direction of the adapter outer cylinder (32) and spaced apart, and the upper end of each first pull rod member (73) is movably connected with the loading plate (72), and the opposite lower end is movably connected with the device base (10).

6. The casing static pressure comprehensive loading test structure according to claim 1, characterized in that, the inner limiting assembly (80) comprises a second pull rod member, the upper end of the second pull rod member is fixedly connected with the inner sealing assembly (50), and the opposite lower end is movably connected with the device base (10) after passing through the adapter inner cylinder (31) and the casing (20) to be tested in sequence.

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