Fine-diameter pipe cabin-penetrating sealing device with high reliability in dynamic environment

Abstract

The application discloses a high-reliability sealing device for a fine-diameter pipe penetrating a cabin in a dynamic environment, which comprises a sealing cover plate, a sealing seat, a nut, a pressing block, a rubber sealing block, a cushion block and a fine-diameter pipe structure. The sealing device has high reliability; the sealing seat has high material strength and modulus; the sealing block and the sealing seat are combined with chain matching design of structural dimensions, so that the contact stress of each sealing surface changes little in the dynamic environment, the sealing effect of the fine-diameter pipe penetrating the cabin in the dynamic environment meets the design requirements, the leakage rate of the cabin penetration part to non-corrosive gas is not more than 10 ‑6 Pa.m 3 / s order of magnitude, the device is suitable for long-time storage conditions, and the rubber sealing block material with reasonable hardness range and strong anti-aging performance is selected, so that the sealing block always maintains good sealing performance under long-time storage conditions.

Description

Technical Field

[0001] This invention relates to the field of transshipment connection equipment technology, and in particular to a high-reliability sealing device for a small-diameter pipe transshipment under dynamic conditions. Background Technology

[0002] With the rapid development of miniaturization technology, small-diameter tubes have been widely used in aerospace, defense, and industrial fields. In practical applications, both ends of the small-diameter tube are connected to structures with a radial dimension much larger than the tube's diameter, resulting in a "dumbbell-shaped" structure where the radial dimensions at both ends are much larger than those in the middle. When the two ends of the small-diameter tube structure are located in different compartments separated by hatches, the tube structure needs to pass through the hatch. If the system requires sealing of the compartment, a small-diameter tube through-chamber sealing device needs to be designed. Previous small-diameter tube through-chamber sealing devices used a two-part butt joint structure for the sealing components, which resulted in poor sealing performance and unsatisfactory sealing reliability under complex dynamic environments.

[0003] Therefore, a high-reliability sealing device for small-diameter pipes penetrating the compartment under dynamic conditions was developed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to design a high-reliability sealing device for small-diameter pipes passing through a compartment under dynamic conditions in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A high-reliability sealing device for small-diameter pipe penetration under dynamic conditions, comprising:

[0007] Sealing cover plate; the sealing cover plate has a first through hole axially located at its center;

[0008] Sealing seat; the sealing seat has an axially arranged mounting hole inside; the first end face of the sealing cover plate is sealed to the first end face of the sealing seat; the outer side wall of the second end of the sealing seat is provided with external threads;

[0009] Nut; the nut is threadedly connected to the sealing seat;

[0010] The pressure block has a fourth through hole axially located at its center.

[0011] Rubber sealing block; the rubber sealing block has a third through hole axially located at its center;

[0012] A pad block; the pad block has a second through hole axially located at its center; the pad block, rubber sealing block, and pressure block are sequentially placed in the mounting holes of the sealing seat;

[0013] The narrow-diameter tube structure is configured to pass sequentially through the first through hole of the sealing cover plate, the second through hole of the pad, the third through hole of the rubber sealing block, and the fourth through hole of the pressure block.

[0014] Preferably, the narrow-diameter pipe through-chamber sealing device further includes a rubber sealing ring, and an annular groove is provided on the first end face of the sealing cover, with the rubber sealing ring installed in the annular groove.

[0015] Furthermore, the small-diameter pipe through-chamber sealing device also includes multiple threaded fasteners. The first end of the sealing seat is provided with a flange structure, and the flange structure is provided with multiple through holes. Correspondingly, multiple threaded holes are provided on the sealing cover plate. The threaded fasteners pass through the through holes and are screwed into the threaded holes for the connection between the sealing cover plate and the sealing seat.

[0016] Preferably, the narrow-diameter pipe through-chamber sealing device further includes a pad plug, on which a first radial notch is radially opened, the first radial notch communicating with a second through hole, and the pad plug is inserted into the first radial notch.

[0017] Preferably, a rubber slit is radially formed on the rubber sealing block, and the rubber slit communicates with the third through hole.

[0018] Preferably, the narrow-diameter pipe through-chamber sealing device further includes a pressure block plug, on which a second radial notch is radially opened, the second radial notch communicating with a fourth through hole, and the pressure block plug is inserted into the second radial notch.

[0019] Preferably, the rubber sealing block is made of EPDM rubber.

[0020] Preferably, both the sealing seat and the nut are made of austenitic stainless steel.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. High sealing reliability: Utilizing the high strength and high modulus of the sealing seat material, combined with the matching design of the structural dimensions of the sealing block and sealing seat, the contact stress changes of each sealing surface are minimized under dynamic conditions. This ensures that the sealing effect of the small-diameter pipe penetration sealing structure meets design requirements under dynamic conditions, with a leakage rate of no more than 10% for non-corrosive gases at the penetration point. - 6 Pa·m 3 On the order of / s;

[0023] 2. Adaptable to long-term storage conditions; by rationally selecting rubber sealing block materials with a specific hardness range and strong anti-aging properties, the sealing blocks can maintain good sealing performance under long-term storage conditions. Attached Figure Description

[0024] Figure 1 This is a perspective view of the present invention;

[0025] Figure 2 This is an exploded view of the present invention;

[0026] Figure 3This is a schematic diagram of the sealing cover plate in this invention;

[0027] Figure 4 This is a cross-sectional view of the sealing seat in this invention;

[0028] Figure 5 This is a schematic diagram of the structure of the pad block in this invention;

[0029] Figure 6 This is a schematic diagram of the structure of the pad plug in this invention;

[0030] Figure 7 This is a schematic diagram of the structure of the rubber sealing block in this invention;

[0031] Figure 8 This is a schematic diagram of the pressure block in this invention;

[0032] Figure 9 This is a schematic diagram of the pressure block plug in this invention;

[0033] In the diagram: 1. Narrow diameter pipe structure, 2. Nut, 3. Pressure block, 31. Fourth through hole, 32. Second radial notch, 33. Pressure block plug, 4. Rubber sealing block, 41. Third through hole, 42. Rubber seam, 5. Gasket, 51. Second through hole, 52. First radial notch, 53. Gasket plug, 6. Threaded fastener, 7. Sealing seat, 8. Rubber sealing ring, 9. Sealing cover plate, 91. First through hole, 92. Annular groove, 93. Threaded hole. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] like Figure 1-2 As shown, a high-reliability sealing device for small-diameter pipes penetrating a compartment under dynamic conditions includes:

[0042] Sealing cover plate 9; a first through hole 91 is provided in the center axis of sealing cover plate 9;

[0043] Sealing seat 7; The sealing seat 7 has an axially provided mounting hole inside; The first end face of the sealing cover plate 9 is sealed to the first end face of the sealing seat 7; The outer side wall of the second end of the sealing seat 7 is provided with external threads;

[0044] Nut 2; Nut 2 is threadedly connected to sealing seat 7;

[0045] Pressure block 3; Pressure block 3 has a fourth through hole 31 axially arranged in its center;

[0046] Rubber sealing block 4; The rubber sealing block 4 has a third through hole 41 axially arranged in its center;

[0047] Pad 5; Pad 5 has a second through hole 51 axially arranged in the center; Pad 5, rubber sealing block 4, and pressure block 3 are placed in the mounting hole of sealing seat 7 in sequence;

[0048] The narrow-diameter tube structure 1 passes sequentially through the first through hole 91 of the sealing cover plate 9, the second through hole 51 of the pad block 5, the third through hole 41 of the rubber sealing block 4, and the fourth through hole 31 of the pressure block 3. The pressure block 3, the rubber sealing block 4, and the pad block 5 are all formed into a cylindrical shape.

[0049] like Figure 2-3 As shown, the narrow-diameter pipe through-chamber sealing device also includes a rubber sealing ring 8, and an annular groove 92 is provided on the first end face of the sealing cover plate 9, and the rubber sealing ring is installed in the annular groove 92.

[0050] like Figure 1-4 As shown, the small-diameter pipe through-chamber sealing device also includes multiple threaded fasteners 6. The first end of the sealing seat 7 is provided with a flange structure, which has multiple through holes. Correspondingly, the sealing cover plate 9 has multiple threaded holes 93. The threaded fasteners 6 pass through the through holes and are screwed into the threaded holes 93 for connection between the sealing cover plate 9 and the sealing seat 7. When the threaded fasteners 6 are tightened, the rubber sealing ring 8 can be compressed, achieving a seal between the sealing seat 7 and the sealing cover plate 9.

[0051] like Figure 2 , 5 As shown in Figure 6, the narrow-diameter pipe through-chamber sealing device also includes a pad plug 53. A first radial notch 52 is radially opened on the pad 5. The first radial notch 52 communicates with the second through hole 51. The pad plug 53 is inserted into the first radial notch 52.

[0052] like Figure 7 As shown, a rubber slit 42 is radially opened on the rubber sealing block 4, and the rubber slit 42 is connected to the third through hole 41.

[0053] like Figure 8 and 9 As shown, the narrow-diameter pipe through-chamber sealing device also includes a pressure block plug 33. The pressure block 3 has a second radial notch 32 radially opened on it. The second radial notch 32 communicates with the fourth through hole 31. The pressure block plug 33 is inserted into the second radial notch 32.

[0054] During installation, the pad 5 is fitted onto the narrow-diameter tube structure 1 through its first radial notch 52 until the narrow-diameter tube structure 1 is positioned at the second through hole 51. The pad plug 53 is then inserted into the first radial notch 52 until it no longer protrudes from the circumferential surface of the pad 5. The small cylinder consisting of the pad 5 and the pad plug 53 is then placed into the sealing seat 7 along the axis of the narrow-diameter tube structure 1 and positioned flat. The rubber seal 4 is then fitted onto the narrow-diameter tube structure 1 with its rubber seam 42 slightly open, so that the narrow-diameter tube structure 1 is positioned at its third through hole 41. The rubber seal 4 is then fitted onto the narrow-diameter tube structure 1 along its axis. The sealing block 4 is placed into the sealing seat 7 and positioned flat. The pressure block 3 is installed on the side. The narrow-diameter tube structure 1 is positioned at the fourth through hole 31 through the second radial notch 32 of the pressure block 3. The pressure block plug 33 is inserted into the second radial notch 32 until it no longer protrudes from the circumferential surface of the pressure block 3. The small cylinder composed of the pressure block 3 and the pressure block plug 33 is placed into the sealing seat 7 along the axis of the narrow-diameter tube structure 1 and positioned flat. The nut 2 is fitted onto the upper end of the narrow-diameter tube structure 1. A torque is applied to the nut 2 to deform the rubber sealing block 4, achieving a cylindrical seal on the narrow-diameter tube structure 1 and the sealing seat 7. This utilizes the incompressible nature of rubber material, causing its outer surface to deform and fill the cylindrical inner surface of the sealing seat 7, forming a seal with the cylindrical surface of the sealing seat 7. A slit is cut in the middle of the rubber sealing block 4 to allow for side installation, and its deformation ensures it adheres tightly to the narrow-diameter tube, forming a seal with the narrow-diameter tube.

[0055] In some embodiments, the rubber sealing block 4 is made of EPDM rubber. The material hardness is adjustable according to the application requirements. It is integrally molded by casting. A through slit is cut radially into the sealing block using a special tool for side assembly.

[0056] In some embodiments, both the sealing seat 7 and the nut 2 are made of austenitic stainless steel. Its high strength and high modulus ensure minimal structural deformation under dynamic conditions, guaranteeing that the effective contact area of ​​the sealing surface always meets the sealing design requirements.

[0057] The pressure block plug 33 adopts a "T-shaped" design, and its structural form matches the structure of the second radial notch 32. The pressure block plug 33 has threaded holes on its side for easy assembly and disassembly. The pad 5 has a grooved structure on its side to ensure that the pad 5 assembly does not detach in the axial direction after assembly. The upper surface of the pad 5 has two threaded holes for easy assembly and disassembly. The pad plug 53 adopts a "T-shaped" design, and its structural form matches the opening structure of the pad 5. The pad plug 53 has threaded holes on its side for easy assembly and disassembly.

[0058] This invention applies torque to the nut 2, axially compressing the rubber sealing block 4 through the pressure block 3 assembly and the pad block 5 assembly. Utilizing the incompressible nature of the rubber material, its outer surface deforms to fill the cylindrical inner surface of the sealing seat 7, forming a seal with the cylindrical surface of the sealing seat 7. A slit is cut in the middle of the rubber sealing block 4 for side mounting, and it adheres tightly to the small-diameter pipe during deformation, forming a seal with the small-diameter pipe. The bottom of the sealing seat 7 achieves a seal with the sealing cover plate 9 through the compressed rubber sealing ring 8. By changing parameters such as the sealing block diameter and hardness, the compression ratio of the rubber sealing block 4 can be adjusted to meet the sealing performance requirements of small-diameter pipes penetrating the compartment under different operating conditions.

[0059] The following is an application example of a small-diameter pipe structure 1 through-chamber sealing device.

[0060] The rubber sealing block 4(4) is made of high-performance intercalated composite EPDM rubber material prepared by the China Academy of Engineering Physics using EPDM rubber and graphite as the main raw materials and intercalation composite technology. After applying a certain tightening torque to the nut 2(2) and tightening it to the sealing seat 7(7), the rubber sealing block 4(4) reaches the specified compression rate. After undergoing specific dynamic environmental tests including high-frequency random vibration, low-frequency sinusoidal vibration, and impact, and after being stored at room temperature for a certain period of time, the helium leakage rate detected by the suction gun can reach 10%. -7 Pa·m 3 / s high sealing level.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-reliability sealing device for narrow-diameter pipes penetrating a compartment under dynamic conditions, characterized in that, include: Sealing cover plate; The sealing cover plate has a first through hole axially located at its center; Sealing seat; the sealing seat has an axially arranged mounting hole inside; the first end face of the sealing cover plate is sealed to the first end face of the sealing seat; the outer side wall of the second end of the sealing seat is provided with external threads; Nut; the nut is threadedly connected to the sealing seat; The pressure block has a fourth through hole axially located at its center. Rubber sealing block; the rubber sealing block has a third through hole axially located at its center; A pad block; the pad block has a second through hole axially located at its center; the pad block, rubber sealing block, and pressure block are sequentially placed in the mounting holes of the sealing seat; The narrow-diameter tube structure is arranged to pass through the first through hole of the sealing cover plate, the second through hole of the gasket, the third through hole of the rubber sealing block, and the fourth through hole of the pressure block in sequence. The narrow-diameter pipe through-chamber sealing device also includes a pad plug, on which a first radial notch is radially opened, the first radial notch communicating with a second through hole, and the pad plug is inserted into the first radial notch. The narrow-diameter pipe through-chamber sealing device also includes a pressure block plug, on which a second radial notch is radially opened, and the second radial notch communicates with a fourth through hole. The pressure block plug is inserted into the second radial notch. The pressure block plug is T-shaped, and its structure matches the structure of the second radial notch. The pressure block plug has a threaded hole structure on its side. The pad plug is T-shaped, and its structure matches the structure of the first radial notch. The pad plug has a threaded hole structure on its side.

2. The high-reliability sealing device for small-diameter pipes penetrating the compartment under dynamic conditions according to claim 1, characterized in that, The narrow-diameter pipe through-chamber sealing device also includes a rubber sealing ring. An annular groove is provided on the first end face of the sealing cover, and the rubber sealing ring is installed in the annular groove.

3. A high-reliability sealing device for small-diameter pipes penetrating a compartment under dynamic conditions, as described in claim 1 or 2, is characterized in that... The small-diameter pipe through-chamber sealing device also includes multiple threaded fasteners. The first end of the sealing seat is provided with a flange structure, and the flange structure is provided with multiple through holes. Correspondingly, multiple threaded holes are provided on the sealing cover plate. The threaded fasteners pass through the through holes and are screwed into the threaded holes for the connection between the sealing cover plate and the sealing seat.

4. The high-reliability sealing device for small-diameter pipes penetrating the compartment under dynamic conditions according to claim 1, characterized in that, A rubber slit is radially formed on the rubber sealing block, and the rubber slit is connected to the third through hole.

5. A high-reliability sealing device for small-diameter pipes penetrating a compartment under dynamic conditions according to claim 1, characterized in that, The rubber sealing block is made of EPDM rubber.

6. A high-reliability sealing device for small-diameter pipes penetrating a compartment under dynamic conditions according to claim 1, characterized in that, Both the sealing seat and the nut are made of austenitic stainless steel.

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