Flexible membrane cartridge seal adapted to high shear and alternating temperature

Abstract

The application discloses a flexible membrane box type sealing device suitable for high shearing force and alternating temperature, which comprises a thrust turbine disc, a wear-resistant stationary ring, a flexible membrane box assembly, a positioning cover plate and a sealing base, the positioning cover plate, the flexible membrane box assembly, the wear-resistant stationary ring and the thrust turbine disc are sequentially arranged in cooperation, the flexible membrane box assembly comprises a flexible membrane box, an inlay ring and a rear ring, the inlay ring and the rear ring are welded on the two sides of the flexible membrane box respectively, the rear ring is positioned on the positioning cover plate, one end of the wear-resistant stationary ring is fixed on the inlay ring in cooperation, and the other end is arranged in cooperation with the thrust turbine disc; the sealing base is sleeved on the outer end of the flexible membrane box assembly; compared with the prior art, the axial force generated can be effectively compensated by using the flexible membrane box assembly, and the sealing effect and the service life of the device are greatly improved; meanwhile, the sealing base is sleeved on the outer side of the flexible membrane box assembly, and the sealing property is further improved.

Description

Technical Field

[0001] This invention relates to the technical field of sealing advanced turbine equipment, and more particularly to a flexible diaphragm-type sealing device that can adapt to high shear forces and alternating temperatures. Background Technology

[0002] Flexible diaphragm seals are a novel type of rotary dynamic seal that can be applied to aerospace propulsion devices. They exhibit exceptional reliability and sealing performance, effectively addressing high-speed yaw and alternating temperatures caused by the delivery of low-pressure oil to the high-pressure oil-gas end. Currently, China's technical capabilities in both theoretical research and practical structural design remain insufficient. Key sealing component materials suffer from inadequate toughness, and surface modification technology lags behind. Therefore, finding high-parameter rotary machinery shaft end seals with superior sealing performance and overcoming the bottleneck of integrated technology encompassing materials, structure, and functionality in high-end sealing components is urgently needed. Summary of the Invention

[0003] To address the shortcomings and defects of existing technologies, this invention provides a flexible diaphragm-type sealing device that adapts to high shear forces and alternating temperatures. To achieve the goals of improving service life, reliability, and sealing performance, the invention offers the following technical solutions.

[0004] A flexible diaphragm-type sealing device adapted to high shear force and alternating temperature includes a thrust turbine disk, a wear-resistant stationary ring, a flexible diaphragm assembly, a positioning cover plate, and a sealing base. The positioning cover plate, the flexible diaphragm assembly, the wear-resistant stationary ring, and the thrust turbine disk are sequentially fitted together. The flexible diaphragm assembly includes a flexible diaphragm, an insert ring, and a rear ring. The insert ring and the rear ring are respectively welded to both sides of the flexible diaphragm. The rear ring is positioned on the positioning cover plate. One end of the wear-resistant stationary ring is fixed to the insert ring, and the other end is fitted to the thrust turbine disk. The sealing base is sleeved on the outer end of the flexible diaphragm assembly.

[0005] Compared with the prior art, the present invention uses a flexible diaphragm assembly instead of a conventional spring assembly. Since the traditional spring-type sealing structure requires the use of a sealing ring to isolate the medium between the compensation ring and the spring seat, and most sealing rings will fail under alternating temperatures, thus failing to achieve the expected sealing effect, the flexible diaphragm assembly can effectively compensate for the generated axial force, greatly improving the sealing effect and service life of the device; at the same time, the sealing base is sleeved on the outside of the flexible diaphragm assembly, further improving the sealing performance.

[0006] Furthermore, the thrust turbine disk includes a sealing rotating ring and a turbine, with the sealing rotating ring and the turbine being integrally formed.

[0007] Through the above improvements, the integrated design of the sealing rotating ring and the turbine stabilizes the rotation of the sealing rotating surface, improves the accuracy of the sealing rotating component, avoids errors caused by machining and assembly, ensures the stable operation of the sealing rotating component, and prevents the high-speed rotating sealing components from inertial wobbling under extreme conditions of high shear force and alternating temperature.

[0008] Furthermore, the flexible membrane box includes a plurality of membrane sheets arranged in concentric circles; each membrane sheet includes a first elastic sheet and a second elastic sheet, the first elastic sheet and the second elastic sheet being staggered and connected end to end.

[0009] Through the above improvements, the flexible diaphragm box is formed by welding several diaphragms end to end in sequence. This eliminates the safety hazard of leakage at the original sealing ring position and improves the sealing performance during use.

[0010] Furthermore, the first elastic sheet includes an upwardly protruding first arc portion, a downwardly protruding first arc portion, and a first elastic portion; the second elastic sheet includes an upwardly protruding second arc portion, a downwardly protruding second arc portion, and a second elastic portion, wherein the first end of the first arc portion is connected to the first end of the second arc portion, and the first arc portion and the second arc portion are correspondingly arranged.

[0011] Through the above improvements, the elastic sheet is equipped with multiple ends, which greatly improves the elastic sheet's resistance to elastic failure and extends its service life; the downward-protruding first arc part and the downward-protruding second arc part are correspondingly set so that the elastic sheet is aligned in position during installation, preventing misalignment.

[0012] Furthermore, the diaphragm is obtained by stamping an elastic thin material.

[0013] Through the above improvements, the diaphragm is obtained by stamping from a thin, elastic material, which allows the diaphragm to withstand extreme high temperatures and pressures after welding, ensuring the stable operation of the sealing device under high speed and high temperature.

[0014] Furthermore, the sealing base is sleeved on the outer end of the flexible membrane box assembly, specifically referring to the sealing block being provided on the outer wall of the mounting ring, the inner wall of the sealing base abutting against the end of the sealing block, and an elastic gap being provided at the upper end of the sealing block.

[0015] Through the above improvements, a sealing block is provided on the outer wall of the mounting ring. The sealing block abuts against the inner wall of the sealing base, so that the sealing base and the mounting ring can be fixed together well, improving the sealing performance inside the device. At the same time, an elastic gap appears at the upper end of the sealing block, which facilitates the deformation of the diaphragm.

[0016] Furthermore, the rear ring is positioned on the positioning cover plate. Specifically, the rear ring is provided with a positioning groove, and the positioning cover plate has a protrusion extending in the axial direction. The protrusion is configured to cooperate with the positioning groove, so that the upper surface of the positioning cover plate and the upper surface of the rear ring are at the same horizontal plane.

[0017] Through the above improvements, the positioning groove on the rear ring cooperates with the protrusion of the positioning cover plate, so that the rear ring can be positioned better. At the same time, through the compression and stretching of the flexible diaphragm, the axial wave spring compensation force can be transmitted to the wear-resistant stationary ring, allowing the wear-resistant stationary ring to move axially.

[0018] Furthermore, one end of the wear-resistant stationary ring is fixed to the insert ring. Specifically, the wear-resistant stationary ring is fixed to the insert ring by a heat fitting process, and the relative circumferential rotation between the wear-resistant stationary ring and the insert ring is restricted by an interference fit.

[0019] Through the above improvements, the wear-resistant stationary ring is fixed to the mounting ring of the flexible diaphragm assembly by a heat-fitting process. The heat-fitting process increases the overall installation accuracy and prevents relative circumferential rotation between the high-strength wear-resistant stationary ring and the flexible diaphragm assembly by interference fit. At the same time, it simplifies the overall structure, avoids the cumbersome installation of too many parts, and makes the overall structure miniaturized and modular, which facilitates the installation of the sealing device.

[0020] Furthermore, an oil slinger groove is provided on the end face of the rotating ring that mates with the wear-resistant stationary ring, and the oil slinger groove is distributed clockwise along the axis.

[0021] Through the above improvements, an oil-throwing groove structure is set on the end face of the rotating ring. By utilizing the surface dynamic pressure effect of the high-speed rotating seal, a high-pressure oil-throwing film is formed between the sealing end faces. This can pump the low-temperature, low-pressure fuel medium on the inside to the high-temperature, high-pressure gas medium on the outside, more efficiently preventing the leakage of gas from the outside to the inside, making the seal safer and more reliable.

[0022] Furthermore, the end face of the rotating ring is coated with a high-strength coating containing Cr, Al, N and C.

[0023] Through the above improvements, a high-strength coating containing Cr, Al, N and C is applied to the end face of the rotating ring, which greatly improves the wear resistance of the contact surface under insufficient oil film conditions, significantly increases the service life, and also improves the strength of the device. Attached Figure Description

[0024] Figure 1 A three-dimensional structural diagram of a partial cross-section of the overall sealing device;

[0025] Figure 2 This is a partial enlarged view of the sealing device;

[0026] Figure 3 This is a two-dimensional cross-sectional structural diagram of the sealing device;

[0027] Figure 4 A three-dimensional structural diagram of a partial cross-section of the running-in assembly of the sealing device;

[0028] Figure 5 This is a two-dimensional structural diagram of the rotating ring end face of the sealing device;

[0029] Among them, 1. Thrust turbine disk; 1.1. Sealing rotating ring; 1.11. Rotating ring end face; 1.12. Oil slinger groove; 1.2. Turbine; 2. Wear-resistant stationary ring; 3. Flexible diaphragm assembly; 3.1. Flexible diaphragm; 3.11. Diaphragm; 3.111. First elastic sheet; 3.1111. First arc portion; 3.1112. First arc portion; 3.1113. First elastic portion; 3.112. Second elastic sheet; 3.1121. Second arc portion; 3.1122. Second arc portion; 3.1123. Second elastic portion; 3.2. Insert ring; 3.21. Sealing block; 3.3. Rear ring; 3.31. Positioning groove; 4. Positioning cover plate; 4.1. Protrusion; 5. Sealing base; 5.1. Elastic gap. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] A flexible diaphragm box sealing device adaptable to high shear force and alternating temperature includes a thrust turbine disk 1, a wear-resistant stationary ring 2, a flexible diaphragm box assembly 3, a positioning cover plate 4, and a sealing base 5. The positioning cover plate 4, the flexible diaphragm box assembly 3, the wear-resistant stationary ring 2, and the thrust turbine disk 1 are sequentially arranged. The flexible diaphragm box assembly 3 includes a flexible diaphragm box 3.1, an insert ring 3.2, and a rear ring 3.3. The insert ring 3.2 and the rear ring 3.3 are respectively welded to both sides of the flexible diaphragm box 3.1. The rear ring 3.3 is positioned on the positioning cover plate 4. One end of the wear-resistant stationary ring 2 is fixed to the insert ring 3.2, and the other end is arranged to cooperate with the thrust turbine disk 1. The sealing base 5 is sleeved on the outer end of the flexible diaphragm box assembly 3.

[0033] The thrust turbine disk 1 includes a sealing rotating ring 1.1 at the upper end and a turbine 1.2 at the lower end. The sealing rotating ring 1.1 is fixed to the shaft end, and the shaft transmits power to the turbine 1.2, so that the rotating ring end face 1.11 of the sealing rotating ring 1.1 runs with the turbine 1.2.

[0034] An oil-slinging groove 1.12 is provided on the rotating ring end face 1.11 where the thrust turbine disk 1 and the wear-resistant stationary ring 2 mate. The oil-slinging groove 1.12 is distributed clockwise toward the axis of the rotating ring end face 1.11 to improve wear resistance, lubrication and stability. At the same time, a high-strength coating containing Cr, Al, N and C is applied to the rotating ring end face 1.11. In actual operation, the turbine 1.2 acts as the active component. The high-strength wear-resistant diamond coating on the surface of the sealing rotating ring 1.1 can improve the wear resistance of the sealing surface and improve the strength and life of the sealing device.

[0035] The sealing rotating ring 1.1 and the turbine 1.2 are integrated, which stabilizes the rotation of the sealing rotating ring 1.1. At the same time, the turbine 1.2 disk is made into an integrated one by using 3D printing technology, which realizes the combination of turbine 1.2 thrust and rotating ring function. It also improves the manufacturing precision and avoids errors caused by processing and assembly.

[0036] The flexible diaphragm box assembly 3 includes a mounting ring 3.2, a flexible diaphragm box 3.1, and a rear ring 3.3 arranged sequentially. The mounting ring 3.2 and the rear ring 3.3 are respectively welded to both sides of the flexible diaphragm box 3.1. The flexible diaphragm box 3.1 includes a plurality of diaphragms 3.11. Each diaphragm 3.11 includes a first elastic sheet 3.111 and a second elastic sheet 3.112, which are staggered and connected end to end. The first arc portion 3.1111 of the first elastic sheet 3.111 and the second arc portion 3.1121 of the second elastic sheet 3.112 are integrated. The first elastic portion 3.1113 of the first elastic sheet 3.111 and the second elastic portion 3.1123 of the second elastic sheet 3.112 are also integrated. The first elastic sheet 3.111 also includes a first arc segment 3.1. 112, the second elastic sheet 3.112 also includes a downwardly protruding second arc segment 3.1122, the first arc segment 3.1112 and the second arc segment 3.1122 are correspondingly arranged, so that the elastic sheet can improve the elastic effect; the diaphragm 3.11 is obtained by stamping elastic thin material, so that the diaphragm 3.11 can still withstand extreme high temperature and pressure after welding, ensuring the stable operation of the sealing device under high speed and high temperature; several diaphragms 3.11 are assembled and welded in a concentric circle manner. During welding, several diaphragms 3.11 are first arranged end to end in sequence, and then welded to form a flexible diaphragm box 3.1. The flexible diaphragm box 3.1 can replace the traditional spring-type sealing structure, eliminating the safety hazard of leakage at the original sealing ring position.

[0037] The rear ring 3.3 on the flexible diaphragm assembly 3 is positioned on the positioning cover plate 4. The rear ring 3.3 is provided with a positioning groove 3.31. The positioning cover plate 4 extends in the axial direction with a protrusion 4.1. The protrusion 4.1 is configured to cooperate with the positioning groove 3.31, so that the upper end face of the positioning cover plate 4 and the upper end face of the rear ring 3.3 are at the same level, so that the rear ring 3.3 can be positioned well. At the same time, through the compression and stretching of the flexible diaphragm 3.1, the axial wave spring compensation force can be effectively transmitted to the wear-resistant stationary ring 2, allowing the wear-resistant stationary ring 2 to move axially.

[0038] The sealing base 5 is sleeved on the outer end of the flexible diaphragm box 3.1 assembly 3. A sealing block 3.21 is provided on the outer wall of the mounting ring 3.2 of the flexible diaphragm box 3.1 assembly 3. The inner wall of the sealing base 5 abuts against the end of the sealing block 3.21, which can greatly improve the sealing performance of the device. At the same time, an elastic gap 5.1 is provided at the upper end of the sealing block 3.21, which allows the flexible diaphragm box 3.1 to deform easily.

[0039] A wear-resistant stationary ring 2 is provided between the flexible diaphragm assembly 3 and the thrust turbine disk 1. One end of the wear-resistant stationary ring 2 is fixed to the mounting ring 3.2 of the flexible diaphragm assembly 3 by a heat fitting process, and the relative circumferential rotation between the wear-resistant stationary ring 2 and the mounting ring 3.2 is restricted by the interference fit. At the same time, the overall structure is simplified, avoiding the cumbersome installation of too many parts, miniaturizing the overall structure, and modularizing it to facilitate the installation of the sealing device. The other end of the wear-resistant stationary ring 2 is provided to cooperate with the sealing rotating ring 1.1.

[0040] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A flexible diaphragm-type sealing device adapted to high shear force and alternating temperature, characterized in that: The assembly includes a thrust turbine disk (1), a wear-resistant stationary ring (2), a flexible diaphragm assembly (3), a positioning cover (4), and a sealing base (5). The positioning cover (4), the flexible diaphragm assembly (3), the wear-resistant stationary ring (2), and the thrust turbine disk (1) are sequentially fitted together. The thrust turbine disk (1) includes a sealing rotating ring (1.1) and a turbine (1.2), which are integrally formed. The flexible diaphragm assembly (3) includes a flexible diaphragm (3.1), an insert ring (3.2), and a rear ring (3.5). 3), the flexible membrane box (3.1) includes a plurality of membrane sheets (3.11), each membrane sheet (3.11) including a first elastic sheet (3.111) and a second elastic sheet (3.112), the first elastic sheet (3.111) and the second elastic sheet (3.112) being staggered and connected end to end, the first elastic sheet (3.111) including an upwardly protruding first arc portion (3.1111) and a downwardly protruding first arc portion (3.1112); the second elastic sheet (3.112) includes an upwardly protruding second arc portion (3.1121). The first arc portion (3.1111) is connected to the first end of the second arc portion (3.1121), and the first arc portion (3.1112) and the second arc portion (3.1122) are correspondingly arranged; the mounting ring (3.2) and the rear ring (3.3) are respectively welded to both sides of the flexible diaphragm box (3.1), the rear ring (3.3) is positioned on the positioning cover plate (4), one end of the wear-resistant stationary ring (2) is fixed to the mounting ring (3.2), and the other end is fixed to the mounting ring (3.2). The thrust turbine disk (1) is configured to cooperate with the sealing base (5) and is sleeved on the outer end of the flexible diaphragm assembly (3). A sealing block (3.21) is provided on the outer wall of the insert ring (3.2). The inner wall of the sealing base (5) abuts against the end of the sealing block (3.21). At the same time, an elastic gap (5.1) is provided on the upper end of the sealing block (3.21). An oil slinger groove (1.12) is provided on the rotating ring end face (1.11) of the thrust turbine disk (1) and the wear-resistant stationary ring (2). The oil slinger groove (1.12) is distributed clockwise along the axis.

2. The flexible diaphragm-type sealing device adaptable to high shear force and alternating temperature according to claim 1, characterized in that: The diaphragms (3.11) are arranged in concentric circles.

3. A flexible diaphragm-type sealing device adaptable to high shear force and alternating temperature according to claim 1 or 2, characterized in that: The diaphragm (3.11) is obtained by stamping an elastic thin material.

4. The flexible diaphragm-type sealing device adaptable to high shear force and alternating temperature according to claim 1, characterized in that: The rear ring (3.3) is provided with a positioning groove (3.31), and the positioning cover plate (4) extends in the axial direction with a protrusion (4.1). The protrusion (4.1) is configured to cooperate with the positioning groove (3.31) so that the upper surface of the positioning cover plate (4) and the upper surface of the rear ring (3.3) are at the same level.

5. A flexible diaphragm-type sealing device adaptable to high shear force and alternating temperature according to claim 1, characterized in that: The wear-resistant stationary ring (2) is fixed to the insert ring (3.2) by a heat fitting process, and the relative circumferential rotation between the wear-resistant stationary ring (2) and the insert ring (3.2) is restricted by an interference fit.

6. The flexible diaphragm-type sealing device adaptable to high shear force and alternating temperature according to claim 1, characterized in that: The rotating ring end face (1.11) is coated with a high-strength coating containing Cr, Al, N and C.

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