An adaptive sealing mechanism for large bore girth sealing

Abstract

The application discloses a self-adaptive sealing mechanism for large-diameter circumferential sealing. The self-adaptive sealing mechanism comprises a cylindrical sealing shell with one end closed and the other end open, one or more than one follow-up sealing rings are sequentially stacked in the cylindrical sealing shell from inside to outside along the axial direction, an elastic ring is stacked on the follow-up sealing ring at the outermost side, a pressing block is arranged outside the elastic ring, an axial sealing block is arranged between two adjacent follow-up sealing rings, and an elastic component is arranged between the outer side wall of the follow-up sealing ring and the inner side wall of the cylindrical sealing shell; a follow-up through groove starting from the radial direction is further arranged on the follow-up sealing ring, a pin shaft is arranged in the follow-up through groove, one end of the pin shaft is fixed on the pressing block, the other end of the pin shaft is fixed on the closed end of the cylindrical sealing shell, and an O-shaped sealing ring is arranged on the inner ring surface of the follow-up sealing ring; and the closed end of the cylindrical sealing shell is further provided with a sliding through hole. The self-adaptive sealing mechanism can realize the functions of axial sliding and circumferential sealing of large-diameter equipment.

Description

Technical Field

[0001] This invention belongs to the field of aerospace and aviation ground test platform technology, specifically relating to an adaptive sealing mechanism for large-diameter circumferential seals. Background Technology

[0002] With the continuous development of my country's aviation industry, the demand for advanced high-performance aero engines has become increasingly urgent. Aero engines are a key and high-value link in the entire aviation industry chain, and have long been a bottleneck restricting the development of my country's aviation industry. As the main equipment for engine testing, ground test rigs must develop in tandem with engine development.

[0003] During the construction of ground test benches, to facilitate equipment installation and disassembly and address the issue of excessive thermal displacement stress, sliding sections and sleeve sections are typically installed. Axial sliding is used to resolve thermal displacement stress and installation problems. The success of this mechanism depends on the reliability of the sealing mechanism between the sliding section and the sleeve section. With the increasing size of ground test bench equipment, large-diameter equipment experiences sealing mechanism failure due to issues such as axial misalignment and vibration caused by equipment installation or circumferential thermal deformation, preventing the equipment from operating normally. Therefore, research on large-diameter circumferential sealing mechanisms is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide an adaptive sealing mechanism for large-diameter circumferential sealing. This invention enables axial sliding and circumferential sealing in large-diameter equipment.

[0005] The technical solution of the present invention is: an adaptive sealing mechanism for large-diameter circumferential sealing, comprising a cylindrical sealing shell closed at one end and open at the other end, wherein one or more follower sealing rings are stacked sequentially from the inside to the outside along the axial direction within the cylindrical sealing shell, an elastic ring is stacked on the outermost follower sealing ring, a clamping block is provided outside the elastic ring, an axial sealing block is provided between two adjacent follower sealing rings, and an elastic component is provided between the outer wall of the follower sealing ring and the inner wall of the cylindrical sealing shell; the follower sealing ring is also provided with a follower through groove starting radially, a pin passing through the follower through groove, one end of the pin being fixed to the clamping block, and the other end being fixed to the closed end of the cylindrical sealing shell, and an O-ring is provided on the inner ring surface of the follower sealing ring; the closed end of the cylindrical sealing shell is also provided with a sliding through hole.

[0006] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, a sealing gasket is also provided on the end face of the follower sealing ring near the closed end of the cylindrical sealing shell.

[0007] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, the clamping block is fixed to the open end of the cylindrical sealing shell by fastener I.

[0008] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, the elastic component includes a spring seat fixed between the outer wall of the follower sealing ring and the inner wall of the cylindrical sealing shell, and the spring seat is provided with a spring.

[0009] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, after the sealing mechanism is fitted onto the sliding section, the head end of the sliding section extends into the sleeve section through the sliding through hole; the sleeve section and the closed end of the cylindrical sealing shell of the sealing mechanism are fixedly connected by fastener II.

[0010] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, the sleeve section and the closed end of the cylindrical sealing shell of the sealing mechanism are sealed by a sealing ring.

[0011] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, the sleeve section includes a cylinder and a flange disposed at the end of the cylinder; the flange is fixedly connected to the closed end of the cylindrical sealing shell by fastener II.

[0012] In the aforementioned adaptive sealing mechanism for large-diameter circumferential sealing, the sealing ring is embedded in an annular groove on the outer surface of the closed end of the cylindrical sealing shell and is pressed by a convex ring on the flange end face to achieve a seal between the flange and the cylindrical sealing shell.

[0013] The advantages of this invention are: This invention designs an adaptive sealing mechanism for large-diameter circumferential sealing. This sealing mechanism can realize the functions of axial sliding and circumferential sealing of large-diameter equipment, making the entire system of the engine ground test bench safer and more reliable, and reducing manufacturing costs. The sealing mechanism can adapt to the axial deviation of the front and rear equipment caused by installation or thermal expansion of large-diameter equipment through the follow-up movement of the sealing ring. The axial elastic ring ensures the compression preload of the sealing gasket, thereby ensuring a seal. At the same time, the follow-up sealing mechanism is circumferentially equipped with elastic components, which generate damping force between the sliding section and the sleeve section, reducing the vibration amplitude of the equipment, ensuring the sealing reliability of the sealing mechanism, and extending the service life of the sealing mechanism. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Reference numerals: 1-Sliding section, 2-Fastener I, 3-Clamping block, 4-Pin, 5-Elastic ring, 6-Cylindrical sealing shell, 7-Following sealing ring, 8-O-ring seal, 9-Sealing gasket, 10-Axial sealing block, 11-Spring, 12-Spring seat, 13-Sealing ring, 14-Fastener II, 15-Flange, 16-Cylinder body, 17-Following through groove, 18-Sliding through hole. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0017] Example 1. An adaptive sealing mechanism for large-diameter circumferential seals, configured as follows: Figure 1 As shown, the device includes a cylindrical sealing shell 6 that is closed at one end and open at the other. Inside the cylindrical sealing shell 6, one or more follower sealing rings 7 are stacked sequentially from the inside to the outside along the axial direction. An elastic ring 5 is stacked on the outermost follower sealing ring 7. A clamping block 3 is provided outside the elastic ring 5. An axial sealing block 10 is provided between two adjacent follower sealing rings 7. An elastic component is provided between the outer wall of the follower sealing ring 7 and the inner wall of the cylindrical sealing shell 6. The follower sealing ring 7 is also provided with a follower through groove 17 that starts radially. A pin 4 passes through the follower through groove 17. One end of the pin 4 is fixed to the clamping block 3, and the other end is fixed to the closed end of the cylindrical sealing shell 6. An O-ring seal 8 is provided on the inner ring surface of the follower sealing ring 7. The closed end of the cylindrical sealing shell 6 is also provided with a sliding through hole 18.

[0018] A sealing gasket 9 is also provided on the end face of the follower sealing ring 7 near the closed end of the cylindrical sealing shell 6.

[0019] The aforementioned clamping block 3 is fixed to the open end of the cylindrical sealing shell 6 by fastener I2.

[0020] The aforementioned elastic component includes a spring seat 12 fixed between the outer wall of the follower sealing ring 7 and the inner wall of the cylindrical sealing shell 6, and a spring 11 is provided on the spring seat 12.

[0021] After the aforementioned sealing mechanism is fitted onto the sliding section 1, the head end of the sliding section 1 extends into the sleeve section through the sliding through hole 18; the sleeve section and the closed end of the cylindrical sealing shell 6 of the sealing mechanism are fixedly connected by fastener II 14.

[0022] The aforementioned sleeve section is sealed to the closed end of the cylindrical sealing shell 6 of the sealing mechanism by a sealing ring 13.

[0023] The aforementioned sleeve section includes a cylinder 16 and a flange 15 disposed at the end of the cylinder 16; the flange 15 is fixedly connected to the closed end of the cylindrical sealing shell 6 by fastener II 14.

[0024] The aforementioned sealing ring 13 is embedded in the annular groove on the outer surface of the closed end of the cylindrical sealing shell 6 and is pressed by the convex ring on the end face of the flange 15 to achieve a seal between the flange 15 and the cylindrical sealing shell 6.

[0025] The sliding section 1 extends into the sleeve section and can slide axially relative to the cylindrical sealing shell 6. The sealing mechanism uses circumferential and axial sealing to seal the gap between the sliding section and the sleeve section.

[0026] The cylindrical sealing shell 6 is equipped with a follower sealing ring 7, and an O-ring 8 is installed on the follower sealing ring 7 to tightly hug the sliding section 1, which can achieve circumferential sealing; the sliding section 1 can slide along the axis to absorb the axial thermal displacement of the equipment.

[0027] There is a sliding gap between the follower sealing ring 7 and the cylindrical sealing shell 6 around the circumference. The follower sealing ring 7 can follow the radial direction to absorb the radial thermal deformation of the equipment or the axial deviation caused by installation.

[0028] The follow-up sealing ring 7, sealing gasket 9 and axial sealing block 10 compress the elastic ring 5 through the clamping block 3 to generate axial clamping force, thus forming an axial seal;

[0029] Multi-stage circumferential and axial seals can be designed to achieve sealing under different pressure conditions.

[0030] Multiple springs 11 are arranged circumferentially between the follow-up sealing ring 7 and the cylindrical sealing shell 6 to generate damping force between the sliding section and the sleeve section, reduce the vibration amplitude of the equipment, ensure the sealing reliability of the sealing mechanism, and extend the service life of the sealing mechanism.

[0031] This invention makes the entire engine ground test bench system safer and more reliable, reduces manufacturing costs, and effectively improves the working environment inside the engine ground test bench factory.

[0032] The sealing mechanism of the present invention can adapt to the deviation of the front and rear shaft centers of large-diameter equipment due to installation or thermal expansion by means of the follow-up movement of the sealing ring;

[0033] This invention features multi-stage circumferential and axial sealing rings, with an axially positioned elastic ring ensuring the sealing gasket compression preload to guarantee a seal.

[0034] The sealing mechanism of this invention is provided with an elastic component in the circumferential direction, which generates a damping force between the sliding section and the sleeve section, reduces the vibration amplitude of the equipment, ensures the sealing reliability of the sealing mechanism, and extends the service life of the sealing mechanism.

[0035] This invention is mainly applied to sealing mechanisms for aerospace and aviation ground test rigs, which solve thermal displacement stress and installation problems by setting up sliding sections and sleeve sections through axial sliding. It can also be applied to industries such as non-ferrous metals, metallurgy, and chemical industry that require the release of equipment thermal displacement stress through axial sliding circumferential sealing.

Claims

1. An adaptive sealing mechanism for large-diameter circumferential seals, characterized in that: The device includes a cylindrical sealing shell (6) that is closed at one end and open at the other end. Inside the cylindrical sealing shell (6), one or more follower sealing rings (7) are stacked sequentially from the inside to the outside along the axial direction. An elastic ring (5) is stacked on the outermost follower sealing ring (7). A clamping block (3) is provided on the outside of the elastic ring (5). An axial sealing block (10) is provided between two adjacent follower sealing rings (7). An elastic component is provided between the outer wall of the follower sealing ring (7) and the inner wall of the cylindrical sealing shell (6). The follower sealing ring (7) is also provided with a follower through groove (17) that starts radially. A pin (4) passes through the follower through groove (17). One end of the pin (4) is fixed on the clamping block (3), and the other end is fixed on the closed end of the cylindrical sealing shell (6). An O-ring (8) is provided on the inner ring surface of the follower sealing ring (7). The closed end of the cylindrical sealing shell (6) is also provided with a sliding through hole (18).

2. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 1, characterized in that: A sealing gasket (9) is also provided on the end face of the follower sealing ring (7) near the closed end of the cylindrical sealing shell (6).

3. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 1, characterized in that: The clamping block (3) is fixed to the open end of the cylindrical sealing shell (6) by fastener I (2).

4. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 1, characterized in that: The elastic component includes a spring seat (12) fixed between the outer wall of the follower sealing ring (7) and the inner wall of the cylindrical sealing shell (6), and a spring (11) is provided on the spring seat (12).

5. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 1, characterized in that: After the sealing mechanism is fitted onto the sliding section (1), the head end of the sliding section (1) extends into the sleeve section through the sliding through hole (18); the sleeve section and the closed end of the cylindrical sealing shell (6) of the sealing mechanism are fixedly connected by fastener II (14).

6. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 5, characterized in that: The sleeve section and the closed end of the cylindrical sealing shell (6) of the sealing mechanism are sealed by a sealing ring (13).

7. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 6, characterized in that: The sleeve section includes a cylinder (16) and a flange (15) disposed at the end of the cylinder (16); the flange (15) is fixedly connected to the closed end of the cylindrical sealing shell (6) by fastener II (14).

8. The adaptive sealing mechanism for large-diameter circumferential sealing according to claim 7, characterized in that: The sealing ring (13) is embedded in the annular groove on the outer surface of the closed end of the cylindrical sealing shell (6) and is pressed by the convex ring on the end face of the flange (15) to achieve a seal between the flange (15) and the cylindrical sealing shell (6).

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