A sealing device for low-pressure chamber pipelines in aviation tests

Abstract

This application provides a sealing device for pipelines in a low-pressure chamber for aviation testing, belonging to the field of aviation testing technology. It includes a bracket, a conical mounting block, a cable sealing tube, and a pressure plate. The bracket is installed inside the cable conduit in the chamber wall and includes front and rear brackets; the front bracket is located inside the chamber, and the rear bracket is located outside. The conical mounting block includes an inner-side and an outer-side conical mounting block, located within the bracket and forming a conical surface contact fit structure. The pressure plate includes an inner-side and an outer-side pressure plate. The inner-side pressure plate is located at the outer end of the inner-side conical mounting block, and the outer-side pressure plate is located at the outer end of the outer-side conical mounting block. A hollow area is provided in the middle of the pressure plate, and a through hole for installing the cable sealing tube is provided in the corresponding area of ​​the conical mounting block. The cable sealing tube is used for cable routing and sealing. This application's solution achieves stable and reliable sealing under low-pressure conditions and features simple use, strong versatility, and significant effectiveness.

Description

Technical Field

[0001] This application relates to the field of aviation testing technology, and in particular to a sealing device for pipelines in a low-pressure chamber for aviation testing. Background Technology

[0002] In the field of aviation testing, using test chambers to simulate high-altitude, low-pressure environments is a common testing method. During the design of test chambers, test pipelines, control cables, and other cables inside the chamber often need to be led out from the chamber walls. To ensure the accuracy of the aviation test environment, the sealing effect of the pipeline sealing devices on the chamber walls is one of the most important factors for the success of the test.

[0003] Pipeline penetration sealing has wide applications in various technical fields, including construction. Existing penetration sealing devices typically utilize elastic blocks fitted onto cables, arranging the cables in parallel modules, and then using surrounding compression blocks to achieve a seal. This achieves good sealing results when the pressure difference between the two sides of the sealing area is small. However, existing technologies have many shortcomings when the pressure difference is large. In particular, when the cabin is under low pressure, the external pressure is greater than the internal pressure. The elastic blocks in existing penetration sealing technologies are easily squeezed out of the penetration sealing device under the pressure difference, which can affect aerospace testing operations. Therefore, it is necessary to design a pipeline sealing device applicable to low-pressure cabins to ensure stable and reliable sealing of aerospace test cabins under low-pressure environments. Summary of the Invention

[0004] In view of this, this application provides a pipeline sealing device for a low-pressure chamber in aviation testing to solve the problem of pipeline sealing failure when the pressure difference between the inside and outside of the chamber is too large.

[0005] This application provides a pipeline sealing device for a low-pressure chamber in an aviation test, applied to the wiring holes in the test chamber wall. The device includes a bracket, a conical mounting block, a cable sealing tube, and a pressure plate. The bracket is installed inside the wiring tube on the chamber wall and includes a front bracket and a rear bracket fixedly connected. The front bracket is located inside the chamber, and the rear bracket is located outside the chamber. The conical mounting block includes an inner conical mounting block and an outer conical mounting block fixedly connected. The inner conical mounting block is located inside the front bracket, and the outer conical mounting block is located inside the rear bracket. The bracket and the conical mounting block form a conical surface contact fit structure. The pressure plate includes an inner pressure plate and an outer pressure plate. The inner pressure plate is located at the outer end of the inner conical mounting block, and the outer pressure plate is located at the outer end of the outer conical mounting block. The pressure plate has a hollow area in the middle, and the conical mounting block area corresponding to the hollow area has a through hole for installing the cable sealing tube. The cable sealing tube is used for wiring and sealing.

[0006] According to a specific implementation of an embodiment of this application, the circumferential surface of the conical mounting block is configured as a structure with a reduced pipe diameter connecting a contracting conical surface and a cylindrical surface. The contracting conical surface is located on the outer side, and the cylindrical surface is located on the inner side. The cylindrical surfaces of the conical mounting blocks inside the cabin and the conical mounting blocks outside the cabin are arranged opposite to each other. The shape of the bracket matches the circumferential surface of the conical mounting block. The bracket is configured as a structure with a reduced pipe diameter connecting a contracting conical surface and a cylindrical surface. The front bracket and the rear bracket are arranged opposite to each other, so that the wiring hole forms a symmetrical structure of contracting conical surface-cylindrical surface-expanding conical surface.

[0007] According to one specific implementation of this application, the axial length of the constricted conical surface of the tapered mounting block is greater than the length of the constricted conical surface of the bracket.

[0008] According to a specific implementation of this application, a first flange structure is provided at the end of the cylindrical surface of the front bracket and the cylindrical surface of the rear bracket, and the front bracket and the rear bracket are fixedly connected by being installed on the first flange structure through a connector.

[0009] According to a specific implementation of an embodiment of this application, the cable sealing tube includes a metal sleeve, a tapered sleeve, a sealing structure, a clamping screw sleeve, and a limiting gasket. The cable is installed inside the metal sleeve. The tapered sleeve, the sealing structure, and the clamping screw sleeve are installed at both ends of the metal sleeve. The clamping screw sleeve is threadedly connected to the end of the metal sleeve. The limiting gasket is threadedly installed on the metal sleeve and contacts the tapered mounting block. The tapered sleeve is located between the metal sleeve and the cable.

[0010] According to a specific implementation of an embodiment of this application, the tapered sleeve is configured as a tapered thin-walled structure, and the large-diameter end of the tapered sleeve is provided with a second flange structure, which is disposed between the end of the metal sleeve and the clamping screw sleeve.

[0011] According to a specific implementation of this application, the inner side of the front and rear ends of the metal sleeve and the position corresponding to the conical sleeve are set as an inclined surface, and the inclined surface is an inwardly contracting structure.

[0012] According to a specific implementation of an embodiment of this application, the sealing structure includes a sealing ring, a cable sealing ring, and a first O-ring. The sealing ring is located between the limiting gasket and the conical mounting block. The cable sealing ring is located between the metal sleeve and the cable, and the cable sealing ring is located inside the small diameter end of the conical sleeve. The first O-ring is located between the second flange structure and the clamping screw sleeve, and the first O-ring is located in the first groove on the second flange structure.

[0013] According to a specific implementation of this application, both the front support and the rear support are provided with stepped surfaces at the pipeline inlet. The stepped surfaces are in contact with the third flange structure at the end face of the conduit, and the front support and the rear support are axially positioned by the stepped surfaces.

[0014] According to a specific implementation of the present application, the stepped surface of the front bracket is provided with a second groove, the stepped surface of the rear bracket is provided with a third groove, a second O-ring is provided in the second groove, and a third O-ring is provided in the third groove.

[0015] Beneficial effects:

[0016] The airborne test low-pressure chamber pipeline sealing device in this embodiment has the following beneficial effects:

[0017] The pipeline sealing device of this application is designed with reliable sealing measures at every possible leakage point, thereby enhancing the sealing performance;

[0018] Suitable for low-pressure chamber conditions: Under low-pressure conditions inside the chamber, the pipeline sealing device can use the force generated by the pressure difference between the inside and outside of the chamber to cause the conical mounting block outside the chamber to retract towards the inside of the chamber. The mounting block inside the chamber is integrated with the mounting block outside the chamber under the action of the connector, preventing it from detaching into the chamber. When the operating conditions change to high-pressure chamber, the device can achieve sealing through the same principle.

[0019] High versatility: The cable sealing tube can be used for sealing different sizes of pipe diameters. Only the position of the cable sealing ring on the conical surface in the metal sleeve needs to be adjusted to meet the sealing requirements of cable pipe diameters within a certain range, and the sealing effect is reliable.

[0020] Low cost: The materials and processing costs are both low. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a low-pressure chamber pipeline sealing device for aviation tests according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of a low-pressure chamber pipeline sealing device for aviation testing according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a cable sealing tube according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of a sealing structure of a tapered sleeve and a clamping screw sleeve according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the inclined surface structure of a metal sleeve according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the sealing ring installation structure of a limiting gasket according to an embodiment of the present invention.

[0028] In the diagram: 1-Screw, 2-Inner side conical mounting block, 3-Second O-ring, 4-Inner side pressure plate, 5-Front bracket, 51-Front bracket flange, 6-Rear bracket, 61-Rear bracket flange, 7-Outer side pressure plate, 8-Third O-ring, 9-Outer side conical mounting block, 10-Bolt, 11-Cable sealing tube, 111-Compression threaded sleeve, 112-Conical sleeve, 113-Limiting gasket, 114-Metal sleeve, 115-Sealing ring, 116-Cable sealing ring, 117-First O-ring, 118-Cable, 12-Bulkhead, 13-Cable routing tube, 131-Third flange structure. Detailed Implementation

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0030] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0034] This application provides a sealing device for the pipeline of a low-pressure chamber in an aviation test, which will be described in detail below with reference to the figures.

[0035] In one embodiment, refer to Figure 1 and Figure 2 The low-pressure chamber pipeline sealing device for aviation tests is applied to the wiring holes of the test chamber wall. The device includes a bracket, a conical mounting block, a cable sealing tube 11, and a pressure plate. The bracket is installed inside the wiring tube 13 on the chamber wall 12. The bracket includes a front bracket 5 and a rear bracket 6 fixedly connected. The front bracket 5 is located inside the chamber, and the rear bracket 6 is located outside the chamber. The conical mounting block includes an inner conical mounting block 2 and an outer conical mounting block 9 fixedly connected. The inner conical mounting block 2 is located inside the front bracket 5, and the outer conical mounting block 9 is located inside the rear bracket 6. The bracket and the conical mounting block form a conical contact fit structure. The pressure plate includes an inner pressure plate 4 and an outer pressure plate 7. The inner pressure plate 4 is located at the outer end of the inner conical mounting block 2, and the outer pressure plate 7 is located at the outer end of the outer conical mounting block 9. The pressure plate has a hollow area in the middle. The conical mounting block area corresponding to the hollow area has a through hole for installing the cable sealing tube 11. The cable sealing tube 11 is used for wiring and sealing.

[0036] In practice, the bracket provides the main support for the pipeline sealing device, the conical mounting block is installed in conjunction with the bracket, and a through hole is machined in the middle of the conical mounting block to provide an installation position for the cable sealing tube 11; the pressure plate axially positions the conical mounting block.

[0037] In one embodiment, the circumferential surface of the conical mounting block is configured as a structure that reduces the pipe diameter by connecting a contracting conical surface and a cylindrical surface. The contracting conical surface is located on the outer side, and the cylindrical surface is located on the inner side. The cylindrical surfaces of the inner conical mounting block 2 and the outer conical mounting block 9 are arranged opposite to each other. The shape of the bracket matches the circumferential surface of the conical mounting block. The bracket is configured as a structure that reduces the pipe diameter by connecting a contracting conical surface and a cylindrical surface. The front bracket 5 and the rear bracket 6 are arranged opposite to each other, so that the wiring hole forms a symmetrical structure of contracting conical surface-cylindrical surface-expanding conical surface.

[0038] In practice, the inner conical mounting block 2 and the outer conical mounting block 9 are installed into the bracket from both ends of the wiring hole, respectively, and mate with the conical surface of the bracket. One side of the conical mounting block is machined with through holes, and the other side of the conical mounting block is machined with threaded holes on the end face of the cylindrical structure. The subsequent screw 1 can pass through one side of the conical mounting block and be threaded on the other side.

[0039] Furthermore, the axial length of the contraction cone surface of the conical mounting block is greater than the length of the contraction cone surface of the support, and the two conical mounting blocks are formed as a whole by screw 1. When a pressure difference occurs between the inside and outside of the chamber, the movement of the high-pressure side conical mounting block moving towards the low-pressure area is restricted by the action of the conical surface, and the other side conical mounting block is also restricted accordingly, thereby solving the problem of the low-pressure chamber pipeline sealing device coming off.

[0040] Furthermore, the outer side pressure plate 7 is installed by bolts 10 and threaded holes of the outer side tapered mounting block 9 without screw 1 through holes. The inner side tapered mounting block 2 with screw 1 through holes and the inner side pressure plate 4 are machined with holes at the same positions. The screw 1 passes through the through holes of the inner side pressure plate 4 and the inner side tapered mounting block 2 and is installed in the threaded hole of the outer side tapered mounting block 9 on the other side. By adjusting the screw 1, the various parts of the pipeline sealing device are compacted and seamless. In addition to pressing the conical mounting blocks, the inner side pressure plate 4 and the outer side pressure plate 7 also serve the following functions: when there is a pressure difference between the inside and outside of the cabin, the conical mounting block on the high-pressure side may move towards the low-pressure side, which may result in a large axial displacement. When the cabin is under low pressure, the outer side pressure plate 7, due to the axial displacement restriction of the corresponding rear support 6, can restrict the axial displacement of the corresponding outer side conical mounting block 9. When the cabin is under high pressure, the inner side pressure plate 4, due to the axial displacement restriction of the corresponding front support 5, can restrict the axial displacement of the corresponding inner side conical mounting block 2.

[0041] Furthermore, both the cylindrical surfaces of the front support 5 and the rear support 6 are provided with first flange structures at their ends. These flanges are then fixedly connected by connectors. In practice, the connectors are bolted, and the front and rear parts of the support are connected by bolts. The first flange structure includes a front support flange 51 on the front support 5 and a rear support flange 61 on the rear support 6.

[0042] Furthermore, both the front bracket 5 and the rear bracket 6 have stepped surfaces at the pipeline inlet. The stepped surfaces contact the third flange structure 131 on the end face of the conduit 13, and the front bracket 5 and the rear bracket 6 are axially positioned by the stepped surfaces.

[0043] Furthermore, the stepped surface of the front bracket 5 is provided with a second groove, and the stepped surface of the rear bracket 6 is provided with a third groove. The second groove is provided with a second O-ring 3, and the third groove is provided with a third O-ring 8.

[0044] In one embodiment, refer to Figure 3 The cable sealing tube 11 includes a metal sleeve 114, a tapered sleeve 112, a sealing structure, a clamping screw sleeve 111, and a limiting gasket 113. The cable 118 is installed inside the metal sleeve 114. The tapered sleeve 112, the sealing structure, and the clamping screw sleeve 111 are installed at both ends of the metal sleeve 114. The clamping screw sleeve 111 is threaded to the end of the metal sleeve 114. The limiting gasket 113 is threaded on the metal sleeve 114 and contacts the tapered mounting block. The tapered sleeve 112 is located between the metal sleeve 114 and the cable 118. The limiting gasket 113 axially positions the metal sleeve 114.

[0045] Furthermore, the tapered sleeve 112 is configured as a tapered thin-walled structure, and the large-diameter end of the tapered sleeve 112 is provided with a second flange structure, which is located between the end of the metal sleeve 114 and the clamping screw sleeve 111.

[0046] In one embodiment, refer to Figure 5 The inner sides of the front and rear ends of the metal sleeve 114, corresponding to the position of the tapered sleeve 112, are set as inclined surfaces. The inclined surfaces are inwardly contracting structures, that is, the openings at both ends of the metal sleeve 114 contain tapered structures. The taper of the tapered sleeve 112 is consistent with the taper of the tapered structure of the metal sleeve 114, ensuring that the tapered sleeve 112 has a large axial movement distance relative to the inner tapered surface of the metal sleeve 114.

[0047] Furthermore, refer to Figure 4 and Figure 6 The sealing structure includes a sealing ring 115, a cable sealing ring 116, and a first O-ring 117. The sealing ring 115 is located between the limiting gasket 113 and the conical mounting block. The cable sealing ring 116 is located between the metal sleeve 114 and the cable 118, and the cable sealing ring 116 is located inside the small diameter end of the conical sleeve 112. The first O-ring 117 is located between the second flange structure and the stepped surface of the clamping screw sleeve 111. The first O-ring 117 is located in the first groove on the second flange structure. When the clamping screw sleeve 111 is tightened, the first O-ring 117 is used to achieve a seal between the second flange structure of the conical sleeve 112 and the stepped surface of the clamping screw sleeve 111.

[0048] In practice, when the clamping sleeve 111 is tightened toward the conical mounting block, the second flange structure of the conical sleeve 112 engages with the stepped surface of the clamping sleeve 111. Under axial force, the conical sleeve 112 will press the cable sealing ring 116, ensuring that the cable sealing ring 116 does not move and achieving effective sealing between the cable 118 and the metal sleeve 114. Furthermore, when the diameter of the cable 118 is different, the relative position of the cable sealing ring 116 in the conical surface is changed. At this time, the relative axial position of the conical sleeve 112 and the inner conical surface of the metal sleeve 114 also changes. Then, by tightening the clamping sleeve 111 toward the conical mounting block, the conical sleeve 112 can press the cable sealing ring 116 again, achieving sealing for cables 118 with different diameters. When the diameter of the cable 118 is much smaller than the inner diameter of the metal sleeve 114, a better sealing effect can be achieved by changing the size of the cable sealing ring 116.

[0049] Furthermore, the limiting gasket 113 is machined with a threaded hole, which mates with the thread of the metal sleeve 114. It mainly seals the cable sealing tube 11 mounting through hole on the conical mounting block by pressing the sealing ring 115 on the limiting gasket 113, while ensuring that the limiting gaskets 113 at both ends axially limit the cable mounting tube, so as to prevent the cable sealing tube 11 from coming out of the conical mounting block.

[0050] Furthermore, when the metal sleeve thread mates with the limiting gasket 113, PTFE tape is wrapped around the thread to effectively prevent air leakage at the thread position.

[0051] The main structure of the device in this application includes a bracket, a conical mounting block, a cable sealing tube 11, and a pressure plate. The device adopts a conical structure, utilizing the pressure difference between the inner and outer sides of the bulkhead 12 to achieve tight compression between the bracket and the conical mounting block, preventing the cable mounting block from detaching. The limiting gasket 113 structure of the cable sealing tube 11 prevents the cable sealing tube 11 from detaching. Simultaneously, the conical sleeve 112 structure used in the cable sealing tube 11 allows it to be used for sealing various types of cables 118. The cable sealing device of this application has a simple structure, strong versatility, and can be applied to various aerospace testing fields.

[0052] The embodiments provided by this invention have the following advantages: Significant sealing effect: The pipeline sealing device incorporates reliable sealing measures at every potential leakage point. Specifically, an O-ring is designed between the bracket and the third flange structure 131 of the conduit to prevent leakage at the bracket; the conical mounting block forms a conical structure with the bracket and is pressed together using screw 1 and a pressure plate to eliminate leakage between the conical mounting block and the bracket; an O-ring is designed on the mounting surface of the sleeve and the conical mounting block to prevent leakage from each cable hole on the conical mounting surface; the sleeve structure also has sealing measures. Applicable to low-pressure chamber conditions: Under low-pressure conditions inside the chamber, the pipeline sealing device utilizes the force generated by the pressure difference between the inside and outside of the chamber to cause the conical mounting block outside the chamber to retract towards the inside of the chamber, and its movement is restricted by the action of the conical surface of the bracket. Meanwhile, the mounting block inside the chamber forms an integral part with the mounting block outside the chamber under the action of screw 1, preventing it from detaching into the chamber. When the operating conditions change to a high-pressure chamber, the device can achieve sealing through the same principle. High versatility: The cable sealing tube 11 can be used for sealing different pipe diameters. Only the position of the cable sealing ring 116 on the conical surface in the metal sleeve 114 needs to be adjusted to meet the sealing requirements of cable 118 pipe diameters within a certain range, and the sealing effect is reliable. Low cost: The materials and processing costs used in this invention are both low.

[0053] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sealing device for pipelines in a low-pressure chamber of an aviation test facility, applied to wiring holes in the test chamber wall, characterized in that, The device includes a bracket, a conical mounting block, a cable sealing tube (11), and a pressure plate. The bracket is installed inside a cable conduit (13) on the bulkhead (12). The bracket includes a fixedly connected front bracket (5) and a rear bracket (6). The front bracket (5) is located inside the bulkhead, and the rear bracket (6) is located outside the bulkhead. The conical mounting block includes a fixedly connected inner conical mounting block (2) and an outer conical mounting block (9). The inner conical mounting block (2) is located inside the front bracket (5), and the outer conical mounting block (9) is located inside the rear conical mounting block (9). Inside the bracket (6), the bracket and the conical mounting block form a conical contact fit structure. The pressure plate includes an inner side pressure plate (4) and an outer side pressure plate (7). The inner side pressure plate (4) is located at the outer end of the inner side conical mounting block (2), and the outer side pressure plate (7) is located at the outer end of the outer side conical mounting block (9). The middle of the pressure plate is provided with a hollow area. The conical mounting block area corresponding to the hollow area is provided with a through hole for installing the cable sealing tube (11). The cable sealing tube (11) is used for wiring and sealing. The circumferential surface of the conical mounting block is set as a structure for reducing the pipe diameter by connecting the contraction conical surface and the cylindrical surface. The contraction conical surface is located on the outside and the cylindrical surface is located on the inside. The cylindrical surface of the conical mounting block (2) inside the cabin and the cylindrical surface of the conical mounting block (9) outside the cabin are set opposite to each other. The shape of the bracket matches the circumferential surface of the conical mounting block. The bracket is set as a structure for reducing the pipe diameter by connecting the contraction conical surface and the cylindrical surface. The front bracket (5) and the rear bracket (6) are set opposite to each other, so that the wiring hole forms a symmetrical structure of contraction conical surface-cylindrical surface-expansion conical surface. The axial length of the contraction conical surface of the conical mounting block is greater than the length of the contraction conical surface of the bracket. When there is a pressure difference between the inside and outside of the cabin, the high-pressure side conical mounting block that moves to the low-pressure area is restricted from moving under the action of the conical surface. The other side conical mounting block is also restricted accordingly. The ends of the cylindrical surface of the front bracket (5) and the cylindrical surface of the rear bracket (6) are both provided with a first flange structure. The front bracket (5) and the rear bracket (6) are fixedly connected by connecting parts installed on the first flange structure. The inner conical mounting block (2) is machined with through holes, and the outer conical mounting block (9) is machined with threaded holes on the end face of the cylindrical structure. The screw (1) passes through one side of the conical mounting block and is threaded on the other side. By adjusting the screw (1), the various parts of the pipeline sealing device are compacted and seamless. The outer pressure plate (7) is installed by bolts (10) and threaded holes of the outer conical mounting block (9) without screw through holes.

2. The sealing device for the low-pressure chamber pipeline of the aviation test according to claim 1, characterized in that, The cable sealing tube (11) includes a metal sleeve (114), a tapered sleeve (112), a sealing structure, a clamping screw sleeve (111), and a limiting gasket (113). The cable (118) is installed inside the metal sleeve (114). The tapered sleeve (112), the sealing structure, and the clamping screw sleeve (111) are installed at both ends of the metal sleeve (114). The clamping screw sleeve (111) is threaded to the end of the metal sleeve (114). The limiting gasket (113) is threaded on the metal sleeve (114) and contacts the tapered mounting block. The tapered sleeve (112) is located between the metal sleeve (114) and the cable (118).

3. The sealing device for the low-pressure chamber pipeline of the aviation test according to claim 2, characterized in that, The tapered sleeve (112) is configured as a tapered thin-walled structure. The large-diameter end of the tapered sleeve (112) is provided with a second flange structure, which is located between the end of the metal sleeve (114) and the clamping screw sleeve (111).

4. The sealing device for the low-pressure chamber pipeline of the aviation test according to claim 3, characterized in that, The inner sides of the front and rear ends of the metal sleeve (114) and the position corresponding to the conical sleeve (112) are set as inclined surfaces, and the inclined surfaces are inwardly contracting structures.

5. The sealing device for the low-pressure chamber pipeline of the aviation test according to claim 2, characterized in that, The sealing structure includes a sealing ring (115), a cable sealing ring (116), and a first O-ring (117). The sealing ring (115) is located between the limiting gasket (113) and the conical mounting block. The cable sealing ring (116) is located between the metal sleeve (114) and the cable (118), and the cable sealing ring (116) is located inside the small diameter end of the conical sleeve (112). The first O-ring (117) is located between the second flange structure and the clamping screw sleeve (111), and the first O-ring (117) is located in the first groove on the second flange structure.

6. The sealing device for the low-pressure chamber pipeline of the aviation test according to claim 1, characterized in that, Both the front bracket (5) and the rear bracket (6) have stepped surfaces at the pipeline inlet. The stepped surfaces contact the third flange structure (131) on the end face of the conduit (13). The stepped surfaces are used to axially position the front bracket (5) and the rear bracket (6).

7. The sealing device for the low-pressure chamber pipeline in aviation testing according to claim 6, characterized in that, The front bracket (5) has a second groove on its stepped surface, and the rear bracket (6) has a third groove on its stepped surface. The second groove contains a second O-ring (3), and the third groove contains a third O-ring (8).

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