High-temperature-resistant compression welded metal bellows mechanical seal structure

Abstract

The application discloses a high-temperature-resistant compression-welding type metal bellows mechanical sealing structure, which comprises a body, the body comprises a mounting shell 1, a bellows assembly 2 is connected in the mounting shell 1, the bellows assembly 2 comprises a rear ring 2.1, a metal bellows 2.2 and an anti-rotation mounting ring 2.3, the rear ring 2.1 and the anti-rotation mounting ring 2.3 are fixedly connected at two ends of the metal bellows 2.2 respectively, the rear ring 2.1 is fixedly connected on the mounting shell 1, the anti-rotation mounting ring 2.3 is movably connected in the mounting shell 1 along the axial direction of the mounting shell 1, one end, away from the metal bellows 2.2, of the anti-rotation mounting ring 2.3 is connected with a static ring 3, a winding plane graphite pad 4 is arranged between the anti-rotation mounting ring 2.3 and the static ring 3, and the static ring 3 is made of silicon carbide material. The application provides a high-temperature-resistant compression-welding type metal bellows mechanical sealing structure which has high high-temperature-resistant capacity and is convenient to process.

Description

Technical Field

[0001] This invention relates to the field of metal bellows, specifically a high-temperature resistant, compression-welded metal bellows mechanical seal structure. Background Technology

[0002] Metal bellows mechanical seals are sealing components that integrate elastic elements, auxiliary seals, and torque transmission structures, and are widely used in critical fields such as aerospace, nuclear power, and petrochemicals. Metal bellows mechanical seals use welded metal bellows assemblies to replace traditional springs and rubber sealing rings to achieve a stable end-face pressure loading and compensation end-face seal. The metal bellows provides axial elastic preload and absorbs displacement caused by end-face wear, shaft movement, and thermal deformation, thus maintaining more stable sealing performance under conditions of high temperature, intense thermal cycling, corrosive media, or conditions unfavorable to rubber materials. With the further application of metal bellows mechanical seals in the aerospace field, modern aerospace technology places higher demands on them, especially under harsh conditions such as ultra-high temperature, mixed media, and high pressure.

[0003] In traditional metal bellows mechanical seal structures, the stationary ring material is made of soft materials such as graphite. During the installation process, the stationary ring is matched with the installation position through interference dimensions. Each product needs to be measured and matched separately, which is difficult to process and relatively complicated. At the same time, graphite materials are easily oxidized in ultra-high temperature and oxygen-containing environments. Therefore, traditional metal bellows mechanical seal structures have the problems of high processing difficulty and poor adaptability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature resistant, press-welded metal bellows mechanical seal structure that is easy to process and has strong high-temperature resistance.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: a high-temperature resistant, compression-welded metal bellows mechanical seal structure, comprising a body, the body comprising a mounting housing, a bellows assembly connected inside the mounting housing, the bellows assembly comprising a rear ring, a metal bellows, and an anti-rotation mounting ring, the rear ring and the anti-rotation mounting ring being fixedly connected to both ends of the metal bellows, the rear ring being fixedly connected to the mounting housing, the anti-rotation mounting ring being movably connected inside the mounting housing along the axial direction of the mounting housing, a stationary ring being connected to the end of the anti-rotation mounting ring away from the metal bellows, a wound planar graphite pad being provided between the anti-rotation mounting ring and the stationary ring, the stationary ring being made of silicon carbide material.

[0006] Compared with the prior art, the advantages of this invention are as follows: First, by connecting the mounting housing, rear ring, anti-rotation mounting ring, and metal bellows, the body achieves axial floating capability to realize elastic compensation. Second, by using the design of the wound flat graphite pad, its high-temperature resistance is utilized, and the two end faces are respectively abutted by the anti-rotation mounting ring and the stationary ring, enabling the body to be used under ultra-high operating temperatures without causing large-area high-temperature oxidation of the wound flat graphite pad, thus ensuring the quality of the wound flat graphite pad in high-temperature operating environments. Third, the stationary ring is made of silicon carbide material, giving it high thermal conductivity and low expansion physical properties, allowing for high-precision machining. This avoids repeated adjustments of the mating dimensions during traditional mounting processes, simplifies the machining process, and ensures a tight fit between the stationary ring, the wound flat graphite pad, and the anti-rotation mounting ring, thereby guaranteeing the quality of the body in high-temperature operating environments.

[0007] As an improvement of the present invention, the metal bellows is fixedly connected to the rear ring and the anti-rotation mounting ring by welding. Through this improvement, a fixed and sealed connection is achieved between the metal bellows and the rear ring and the anti-rotation mounting ring.

[0008] As an improvement of the present invention, the anti-rotation mounting ring is provided with a mounting groove for mounting a wound flat graphite pad on the side near the stationary ring. Through this improvement, the installation stability of the wound flat graphite pad is improved, and it is not easy to fall off even when it is deformed by heat.

[0009] As an improvement of the present invention, one side of the stationary ring abuts against the anti-rotation mounting ring, and the other side of the stationary ring is provided with a clamping ring for bringing the stationary ring closer to the anti-rotation mounting ring. Through this improvement, the clamping ring enables the stationary ring to move closer to the anti-rotation mounting ring and ensures the abutting effect between the stationary ring and the anti-rotation mounting ring.

[0010] As an improvement of the present invention, the clamping ring includes a clamping part for clamping the stationary ring and a connecting part for welding to the anti-rotation mounting ring. The connecting part is located on the outer ring of the clamping part. With this improvement, after the clamping ring clamps the stationary ring to the anti-rotation mounting ring, the clamping ring is welded to the anti-rotation mounting ring, thereby ensuring the installation and fixation of the clamping ring and the clamping stability of the stationary ring.

[0011] As an improvement of the present invention, the clamping ring is provided with a plurality of clamping anti-rotation blocks in the circumferential direction, and the mounting housing is provided with clamping anti-rotation grooves that fit with the clamping anti-rotation blocks. Through this improvement, relative rotation between the mounting housing and the clamping ring is prevented during the relative operation of the main body, thereby preventing relative rotation between the anti-rotation mounting ring, the metal bellows and the mounting housing. At the same time, the clamping anti-rotation grooves also determine the movement trajectory for the axial movement of the anti-rotation mounting ring to ensure the accuracy of the axial movement.

[0012] As an improvement of the present invention, the inner circumferential surface of the anti-rotation mounting ring is provided with a plurality of anti-rotation mounting blocks, and the stationary ring is provided with a plurality of anti-rotation mounting grooves that fit with the anti-rotation mounting blocks. The anti-rotation mounting blocks protrude toward the stationary ring, and the outer diameter of the anti-rotation mounting blocks is equal to the inner diameter of the connecting part of the clamping ring. Through this improvement, the stationary ring is prevented from being rotated during the relative operation of the body, and the fact that the outer diameter of the anti-rotation mounting blocks is equal to the inner diameter of the connecting part of the clamping ring can ensure the coaxiality of the anti-rotation mounting ring and the clamping ring when they are connected.

[0013] As an improvement of the present invention, the inner ring of the anti-rotation mounting ring includes a mounting protective ring that thickens towards the stationary ring. The connection between the mounting protective ring and the anti-rotation mounting ring is inclined. The inner ring of the stationary ring includes a stationary ring protective ring that thickens away from the anti-rotation mounting ring. The connection between the stationary ring protective ring and the stationary ring is inclined. The mounting protective ring is located inside the stationary ring protective ring. Through this improvement, the design of the mounting protective ring and the stationary ring protective ring achieves the thickening of the anti-rotation mounting ring, thereby reducing stress concentration in the material and preventing the brittle material from chipping and breaking during the clamping welding process of the clamping ring, especially since the stationary ring is made of silicon carbide, which is highly brittle. At the same time, through the cooperative design of the mounting protective ring and the stationary ring protective ring, the wound flat graphite pad is protected on the inside, preventing the high-temperature medium from directly impacting the clamping part between the wound flat graphite pad and the stationary ring when conveying high-temperature medium. This allows the body to be used in both internal and external high-temperature environments.

[0014] As an improvement of the present invention, the mounting housing is formed by splicing two halves of the housing. Through this improvement, the design of the clamping ring clamping welding structure means that if the traditional integrated mounting housing design is adopted, the size of the mounting housing will increase, which will further increase the overall size of the metal bellows mechanical seal, making it difficult to process and assemble. Therefore, the design of two halves of the housing optimizes this problem. The circumferential clamping function of the integrated mounting housing is achieved by the face-to-face cooperation of the two halves of the housing.

[0015] As an improvement of the present invention, the mounting housing includes a flange portion for fixed connection with an external device. The flange portion has a connection hole and is located on the outer ring of the metal bellows. A protective portion is provided at the end of the flange portion near the anti-rotation mounting ring. The protective portion is used to wrap the anti-rotation mounting ring and the stationary ring. A housing connecting portion is provided at the end of the flange portion near the rear ring. An outer cover plate is fitted onto the housing connecting portion to shape the mounting housing. The outer ring of the outer cover plate has a sleeve ring for fitting onto the housing connecting portion. The inner ring of the outer cover plate is used to abut against the rear ring to position the rear ring. The rear ring has an abutment groove that abuts against the inner ring of the outer cover plate. Through this improvement, the design of the outer cover plate shapes the splicing of the two half-shells, and the tightness between the outer cover plate and the abutment groove ensures the coaxiality between the bellows assembly and the mounting housing, effectively avoiding contact between the bellows assembly and the mounting housing, ensuring the quality of the bellows assembly, and realizing a dual composite design of space optimization and matching positioning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a cross-sectional view of the entire structure of the invention in the clamping anti-rotation block.

[0018] Figure 3 This is the present invention. Figure 2 Enlarged structural diagram of section A in the middle.

[0019] Figure 4 This is a schematic diagram of the overall structure of the invention, showing the static ring and the clamping ring abutting against each other.

[0020] Figure 5 This is the present invention. Figure 4 Enlarged structural diagram of section B.

[0021] Figure 6 This is a schematic diagram of the installation housing clamping anti-rotation groove structure of the present invention.

[0022] Figure 7 This is a schematic diagram of the explosion-proof mounting ring, stationary ring, and clamping ring structure of the present invention.

[0023] The figure shows: 1. Mounting housing, 1.1. Anti-rotation clamping groove, 1.2. Half housing, 1.3. Flange, 1.4. Connecting hole, 1.5. Protective part, 1.6. Housing connection part, 2. Bellows assembly, 2.1. Rear ring, 2.1.1. Abutment groove, 2.2. Metal bellows, 2.3. Anti-rotation mounting ring, 2.3.1. Mounting groove, 2.3.2. Anti-rotation mounting block, 2.3.3. Protective mounting ring, 3. Stationary ring, 3.1. Anti-rotation mounting groove, 3.2. Stationary ring protective ring, 4. Wound flat graphite pad, 5. Clamping ring, 5.1. Abutment part, 5.2. Connecting part, 5.3. Anti-rotation clamping block, 6. Outer cover plate, 6.1. Sleeve ring. Detailed Implementation

[0024] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 , Figure 3 , Figure 5 As shown, a high-temperature resistant, press-welded metal bellows 2.2 mechanical seal structure includes a body, which includes a mounting housing 1. A bellows assembly 2 is connected inside the mounting housing 1. The bellows assembly 2 includes a rear ring 2.1, a metal bellows 2.2, and an anti-rotation mounting ring 2.3. The rear ring 2.1 and the anti-rotation mounting ring 2.3 are welded and fixed to both ends of the metal bellows 2.2, respectively. The rear ring 2.1 is fixedly connected to the mounting housing 1. The anti-rotation mounting ring 2.3 is movably connected to the mounting housing 1 along the axial direction of the mounting housing 1. A stationary ring 3 is connected to the end of the anti-rotation mounting ring 2.3 away from the metal bellows 2.2. A wound planar graphite pad 4 is provided between the anti-rotation mounting ring 2.3 and the stationary ring 3. The stationary ring 3 is made of silicon carbide material.

[0026] like Figure 2 , Figure 4 , Figure 7 As shown, the anti-rotation mounting ring 2.3 has a mounting groove 2.3.1 for mounting the wound flat graphite pad 4 on the side near the stationary ring 3.

[0027] like Figure 2-7As shown, one side of the stationary ring 3 abuts against the anti-rotation mounting ring 2.3, and the other side of the stationary ring 3 is provided with a clamping ring 5 for bringing the stationary ring 3 closer to the anti-rotation mounting ring 2.3. The clamping ring 5 includes a clamping part 5.1 for clamping the stationary ring 3 and a connecting part 5.2 for welding with the anti-rotation mounting ring 2.3. The connecting part 5.2 is located on the outer ring of the clamping part 5.1. The clamping ring 5 has two clamping anti-rotation blocks 5.3 in the circumferential direction. The mounting housing 1 has clamping anti-rotation grooves 1.1 that fit with the clamping anti-rotation blocks 5.3. The inner ring of the anti-rotation mounting ring 2.3 has multiple mounting anti-rotation blocks 2.3.2 in the circumferential direction. The stationary ring 3 has multiple mounting anti-rotation grooves 3.1 that fit with the mounting anti-rotation blocks 2.3.2. The mounting anti-rotation blocks 2.3.2 protrude towards the stationary ring 3, and the outer diameter of the mounting anti-rotation blocks 2.3.2 is equal to the inner diameter of the connecting part 5.2 of the clamping ring 5.

[0028] like Figure 2 , Figure 4 , Figure 7 As shown, the inner ring of the anti-rotation mounting ring 2.3 includes a mounting protective ring 2.3.3 that thickens towards the stationary ring 3. The connection between the mounting protective ring 2.3.3 and the anti-rotation mounting ring 2.3 is inclined. The inner ring of the stationary ring 3 includes a stationary ring protective ring 3.2 that thickens away from the anti-rotation mounting ring 2.3. The connection between the stationary ring protective ring 3.2 and the stationary ring 3 is inclined. The mounting protective ring 2.3.3 is located inside the stationary ring protective ring 3.2. The design of the mounting protective ring 2.3.3 achieves the thickening of the anti-rotation mounting ring 2.3 and the protection of the stationary ring. The design of ring 3.2 thickens the stationary ring 3, thereby reducing stress concentration in the material and preventing the brittle material from chipping and breaking during the clamping welding process of the clamping ring 5. In particular, the stationary ring 3 is made of silicon carbide, which is highly brittle. At the same time, the design of the protective rings 2.3.3 and 3.2 protects the wound flat graphite pad 4 on the inside, preventing the high-temperature medium from directly impacting the clamping part between the wound flat graphite pad 4 and the stationary ring 3 when conveying high-temperature medium. This allows the body to be used in both internal and external high-temperature environments.

[0029] like Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7As shown, the mounting housing 1 is formed by splicing two halves of the housing 1.2. The mounting housing 1 includes a flange portion 1.3 for fixed connection with external equipment. The flange portion 1.3 is provided with a connection hole 1.4. The flange portion 1.3 is located on the outer ring of the metal bellows 2.2. A protective part 1.5 is provided at one end of the flange portion 1.3 near the anti-rotation mounting ring 2.3. The protective part 1.5 is used to wrap the anti-rotation mounting ring 2.3 and the stationary ring 3. The inner side of the anti-rotation groove 1.1 is provided with the protective part 1.5. A housing connecting part 1.6 is provided at one end of the flange portion 1.3 near the rear ring 2.1. An outer cover plate 6 is sleeved on the housing connecting part 1.6 to fix it. The mounting housing 1 has an outer ring on the outer cover plate 6 for fitting onto the connecting part 1.6. The inner ring of the outer cover plate 6 abuts against the rear ring 2.1 to position the rear ring 2.1. The rear ring 2.1 has an abutment groove 2.1.1 that abuts against the inner ring of the outer cover plate 6. Through the design of the outer cover plate 6, the two half-shells are spliced ​​and shaped. The tightness between the outer cover plate 6 and the abutment groove 2.1.1 ensures the coaxiality between the bellows assembly 2 and the mounting housing 1, effectively avoiding contact between the bellows assembly 2 and the mounting housing 1, ensuring the quality of use of the bellows assembly 2, and realizing a dual composite design of space optimization and matching positioning.

[0030] This invention replaces the traditional metal bellows 2.2 stationary ring 3 with a compressed wound flat graphite pad 4, and brings the wound flat graphite pad 4 into contact with and compresses the stationary ring 3, achieving a tight fit between the stationary ring 3 and the wound flat graphite pad 4 for sealing. Due to the high temperature resistance of the wound flat graphite pad 4, this structure can be used under ultra-high operating temperatures. Moreover, compared with the traditional glued inlaid bellows, through structural design and material physical properties, the leakage channel is transformed from the inlaid surface into the compressed contact surface between the stationary ring 3 and the wound flat graphite pad 4, greatly improving the high temperature resistance sealing performance of the metal bellows 2.2.

[0031] In traditional metal bellows 2.2 mechanical seals, the stationary ring 3 is typically made of soft materials such as graphite. During the installation process, the stationary ring 3 is fitted with the installation position through interference fit, requiring individual measurement and fitting for each product. This process is complex and difficult to manufacture. Furthermore, graphite is easily oxidized in ultra-high temperature and oxygen-rich environments. In this invention, the stationary ring 3 is made of silicon carbide, which has relatively stable physical properties, including high thermal conductivity and low expansion. However, due to its brittle nature, it is prone to breakage during installation. Its excellent physical properties cannot be used in traditional metal bellows 2.2 installations. However, through the clamping and welding structure of this invention, the silicon carbide stationary ring 3 can be individually and precisely machined, avoiding repeated adjustments of the fitting dimensions during traditional installation processes. This ensures the fit of the clamping surface and the overall precision of the stationary ring 3.

[0032] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A high-temperature resistant, compression-welded metal bellows mechanical seal structure, comprising a body, characterized in that: The main body includes a mounting housing (1), and a bellows assembly (2) is connected inside the mounting housing (1). The bellows assembly (2) includes a rear ring (2.1), a metal bellows (2.2), and an anti-rotation mounting ring (2.3). The rear ring (2.1) and the anti-rotation mounting ring (2.3) are respectively fixedly connected to the two ends of the metal bellows (2.2). The rear ring (2.1) is fixedly connected to the mounting housing (1). The anti-rotation mounting ring (2.3) is movably connected inside the mounting housing (1) along the axial direction of the mounting housing (1). A stationary ring (3) is connected to the end of the anti-rotation mounting ring (2.3) away from the metal bellows (2.2). A wound planar graphite pad (4) is provided between the anti-rotation mounting ring (2.3) and the stationary ring (3). The stationary ring (3) is made of silicon carbide material.

2. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 1, characterized in that: The metal bellows (2.2) is fixedly connected to the rear ring (2.1) and the anti-rotation mounting ring (2.3) by welding.

3. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 1, characterized in that: The anti-rotation mounting ring (2.3) has a mounting groove (2.3.1) for mounting a wound flat graphite pad (4) on the side near the stationary ring (3).

4. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 3, characterized in that: One side of the stationary ring (3) abuts against the anti-rotation mounting ring (2.3), and the other side of the stationary ring (3) is provided with a clamping ring (5) for bringing the stationary ring (3) closer to the anti-rotation mounting ring (2.3).

5. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 4, characterized in that: The clamping ring (5) includes a clamping part (5.1) for clamping the stationary ring (3) and a connecting part (5.2) for welding with the anti-rotation mounting ring (2.3), the connecting part (5.2) being disposed on the outer ring of the clamping part (5.1).

6. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 5, characterized in that: The clamping ring (5) has multiple clamping anti-rotation blocks (5.3) in its circumferential direction, and the mounting housing (1) has clamping anti-rotation grooves (1.1) that fit with the clamping anti-rotation blocks (5.3).

7. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 6, characterized in that: The inner circumference of the anti-rotation mounting ring (2.3) is provided with a plurality of anti-rotation mounting blocks (2.3.2), and the stationary ring (3) is provided with a plurality of anti-rotation mounting grooves (3.1) that fit with the anti-rotation mounting blocks (2.3.2). The anti-rotation mounting blocks (2.3.2) protrude toward the stationary ring (3), and the outer diameter of the anti-rotation mounting blocks (2.3.2) is equal to the inner diameter of the connecting part (5.2) of the clamping ring (5).

8. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 3, characterized in that: The inner ring of the anti-rotation mounting ring (2.3) includes a mounting protective ring (2.3.3) that thickens towards the stationary ring (3). The connection between the mounting protective ring (2.3.3) and the anti-rotation mounting ring (2.3) is designed at an angle. The inner ring of the stationary ring (3) includes a stationary ring protective ring (3.2) that thickens away from the anti-rotation mounting ring (2.3). The connection between the stationary ring protective ring (3.2) and the stationary ring (3) is designed at an angle. The mounting protective ring (2.3.3) is located inside the stationary ring protective ring (3.2).

9. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 5, characterized in that: The mounting housing (1) is formed by splicing two halves of the housing (1.2).

10. The high-temperature resistant, press-welded metal bellows mechanical seal structure according to claim 9, characterized in that: The mounting housing (1) includes a flange (1.3) for fixed connection with an external device. The flange (1.3) has a connection hole (1.4). The flange (1.3) is located on the outer ring of the metal bellows (2.2). A protective part (1.5) is provided at one end of the flange (1.3) near the anti-rotation mounting ring (2.3). The protective part (1.5) is used to wrap the anti-rotation mounting ring (2.3) and the stationary ring (3). The flange (1.3) is located near the rear ring (2.3). 1) One end is provided with a housing connecting part (1.6), and an outer cover plate (6) is fitted on the connecting part (5.2) (1.6) to fix and install the housing (1). The outer ring of the outer cover plate (6) is provided with a sleeve ring (6.1) for fitting on the housing connecting part (1.6). The inner ring of the outer cover plate (6) is used to abut against the rear ring (2.1) to position the rear ring (2.1). The rear ring (2.1) is provided with an abutment groove (2.1.1) that abuts against the inner ring of the outer cover plate (6).

Images