A sealing structure and assembly method

Abstract

This invention provides a sealing structure and assembly method, belonging to the field of mechanical seal technology. It includes: a container body; a cap fixed to the end of the container body, with a predetermined interval between the container body and the cap; a sealing ring fixedly connected to the cap; and a sealing retaining ring fixedly connected to the container body. The end of the sealing retaining ring contacts the end of the sealing ring, and the sealing ring is fixed inside the predetermined interval via the sealing retaining ring. By adopting the technical solution of this invention, the manufacturing difficulty of the cap is reduced, the structural shape of the sidewall connection part of the cap is simplified, assembly is easy, the performance of rotating containers is improved, and good assembly processability, sealing performance, structural stability, and reliability can be achieved simultaneously.

Description

Technical Field

[0001] This invention relates to the field of mechanical seal technology, and in particular to a sealing structure and assembly method. Background Technology

[0002] Rotary containers, which combine mechanical operation and sealing functions, represent a new technological demand in the high-end equipment manufacturing industry in recent years. Under high-speed operation, the container cavity formed by the rotating components must have excellent sealing properties to achieve one or more functions beyond traditional mechanical functions, such as pressure holding, storage, or special flow field distribution. This places higher demands on the structural design and forming methods of rotary containers.

[0003] This higher requirement is specifically manifested in: (1) the design of rotating containers has been upgraded from a single-dimensional mechanical performance design to a multi-dimensional comprehensive design that considers mechanical performance, sealing performance, and even the influence of internal fluid and thermal stress; (2) the sealing structure design needs to comprehensively consider the dimensional chain between components under static conditions and the deformation coordination between components under dynamic conditions; (3) the manufacturing and assembly processability of rotating containers that meet functional and performance requirements.

[0004] On the other hand, to meet the high-speed operation requirements of rotating containers, thin-walled structures are typically used. The wall thickness at the connection between the rotating container body and the cover is very thin, leaving little room for sealing design. Traditional mechanical seals such as shaft seals, end face seals, and bellows seals require large space for fit, making them difficult to apply in thin-walled structures operating at high speeds. Furthermore, efficient, reliable, and economical sealing structures and molding methods are currently the technical bottleneck and research and development goal for rotating container design.

[0005] In summary, existing sealing structures are too large to be used in rotating containers with thin-walled structures. Furthermore, sealing structures suitable for use in rotating containers are complex and difficult to manufacture using conventional processes, resulting in high costs. Existing sealing structures also fail to meet the deformation coordination requirements of rotating containers under centrifugal force, leading to low reliability. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a sealing structure and assembly method to solve the technical problems of limited space in high-speed rotating containers, making it difficult to set, manufacture and assemble conventional sealing structures, as well as the technical problem of uncoordinated dynamic deformation of the sealing structure under high-speed environment, resulting in low reliability of the sealing device.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0008] A sealing structure, comprising:

[0009] Container body;

[0010] A cap is fixed to the end of the container body, and a preset interval is provided between the container body and the cap;

[0011] A sealing ring fixedly connected to the cover;

[0012] A sealing retaining ring fixedly connected to the container body;

[0013] The end of the sealing retaining ring contacts the end of the sealing ring, and the sealing ring is fixed inside the preset interval by the sealing retaining ring.

[0014] Optionally, the cover includes: a top plate; an outer annular flange connected to the edge of the top plate; a baffle connected to the edge of the top plate and perpendicular to the outer annular flange; the top plate, the outer annular flange and the baffle are integrally formed.

[0015] Optionally, the sealing ring is an L-shaped ring structure; the sealing ring includes: a sealing ring body; an inner annular flange integrally formed with the sealing ring body; the radial thickness of the inner annular flange is the same as the thickness of the baffle.

[0016] Optionally, the sealing ring has an annular structure and a D-shaped cross-section; the sealing ring includes: a straight section, one end of which is connected to one end of a first arc section; the other end of the first arc section is connected to one end of a second arc section, the other end of the second arc section is connected to one end of a third arc section, and the other end of the third arc section is connected to the other end of the straight section.

[0017] Optionally, the first arc segment is an arc with a radius of 0.2mm to 1.0mm; the second arc segment is an arc with a radius of 3mm to 10mm; and the third arc segment is an arc with a radius of 0.2mm to 1.0mm.

[0018] Optionally, the second arc segment is connected to the inner surface of the container body by an interference fit; the outer surface of the sealing ring body is connected to the inner surface of the container body by an interference fit; and the inner surface of the sealing ring body is connected to the outer surface of the baffle by an interference fit.

[0019] Optionally, the interference between the outer surface of the sealing ring body and the inner surface of the container body is greater than the interference between the inner surface of the sealing ring body and the outer surface of the baffle; the interference between the inner surface of the sealing ring body and the outer surface of the baffle is greater than the interference between the second arc segment and the inner surface of the container body.

[0020] Optionally, the roughness of the inner surface of the container body and the outer surface of the baffle shall not exceed 1.6 μm to ensure the sealing of the container body.

[0021] The present invention also provides a method for assembling a sealing structure, comprising:

[0022] Step S1: Bond the straight section to the upper part of the outer surface of the baffle and cure it;

[0023] Step S2: Adhere the outer surface of the sealing ring body to the inner surface of the container body;

[0024] Step S3: When the outer surface of the sealing ring body is bonded to the inner surface of the container body and has not yet cured, the cap with the sealing ring bonded to it is interference-fitted to the container body with the sealing ring bonded to it.

[0025] Step S4: Push the cap downwards until the lower surface of the outer annular flange contacts the container body, thereby moving the sealing ring to the final fixed position;

[0026] Step S5: Wait for the adhesive on the outer surface of the sealing ring body and the inner surface of the container body to cure.

[0027] Optionally, in step S3, when the cap with the sealing ring is bonded to the container body with the sealing stop bonded to the container body is interference-fitted, the lower surface of the outer annular flange is located 0.2mm to 0.5mm from the top of the container body.

[0028] The above-described solution of the present invention has at least the following beneficial effects:

[0029] The above-described solution of the present invention includes: a container body; a cap fixed to the end of the container body, wherein a predetermined interval is provided between the container body and the cap; a sealing ring fixedly connected to the cap; and a sealing retaining ring fixedly connected to the container body; wherein the end of the sealing retaining ring contacts the end of the sealing ring, and the sealing ring is fixed inside the predetermined interval by the sealing retaining ring. By setting a separate design for the sealing retaining ring, the sealing ring, and the retaining ring, the manufacturing difficulty of the cap is reduced, the structural shape of the connection part of the cap side wall is simplified, assembly is easier, and the performance of the rotating container is improved. By setting a sealing ring with a D-shaped cross-section and adopting a design with a gradually decreasing interference fit, good assembly processability, sealing performance, structural stability, and reliability are simultaneously achieved. Attached Figure Description

[0030] Figure 1 This is a partial cross-sectional view of the sealing structure described in this invention;

[0031] Figure 2 This is a cross-sectional view of the sealing ring in the sealing structure described in this invention;

[0032] Figure 3This is a schematic diagram of the sealing ring in the sealing structure described in this invention;

[0033] Figure 4 This is a cross-sectional view of the sealing structure described in this invention;

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Container body; 21. Top plate; 22. Outer annular flange; 23. Baffle; 3. Sealing ring; 31. Straight section; 32. First arc section; 33. Second arc section; 34. Third arc section; 4. Sealing retaining ring; 41. Sealing retaining ring body; 42. Inner annular flange. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] The present invention provides a sealing structure, comprising: a container body 1; a cap fixed to the end of the container body 1, wherein a preset interval is provided between the container body 1 and the cap; a sealing ring 3 fixedly connected to the cap; and a sealing retaining ring 4 fixedly connected to the container body 1; wherein the end of the sealing retaining ring 4 contacts the end of the sealing ring 3, and the sealing ring 3 is fixed inside the preset interval by the sealing retaining ring 4.

[0038] like Figure 1 As shown in this embodiment, in order to meet the high-speed operation requirements of the rotating container, the container body 1 of this application needs to adopt a thin-walled structure with a wall thickness of 1mm to 10mm, and the material is a metal alloy or carbon fiber composite material.

[0039] The cap is connected to the upper part of the container body 1, forming a preset gap space between them. The sealing ring 3 and the sealing retaining ring 4 are disposed inside the preset gap. By setting a split sealing structure, the sealing retaining ring 4 and the cap are separated into two independent parts, which greatly reduces the manufacturing difficulty of the cap and simplifies the structure of the part where the cap is connected to the container body 1. It can effectively control the uniformity of the wall thickness of the cap sidewall, thereby reducing the unbalanced mass of the rotating container.

[0040] The sealing ring 3 and the sealing retaining ring 4 are both located within a preset interval. The top of the sealing ring 3 is fixedly connected to the lower surface of the outer annular flange 22. The sealing retaining ring 4 is located at the lower part of the sealing ring 3 and is fixedly connected to the bottom of the sealing ring 3, which serves as a structural support and also provides a controllable sealing space for the installation and compression of the sealing ring 3. At the same time, it can limit the dynamic deformation of the sealing ring 3 under high-speed rotation.

[0041] Compared with static or dynamic rubber ring sealing structures, the split sealing structure has the characteristics of small radial thickness of sealing space and limited deformation of rubber ring, which makes the sealing ring 3 better meet the strength performance requirements of rotating containers during operation and the deformation coordination requirements of the sealing ring 3 under the action of centrifugal force.

[0042] In an optional embodiment of the present invention, the cover includes: a top plate 21; an outer annular flange 22 connected to the edge of the top plate 21; and a baffle 23 connected to the edge of the top plate 21 and perpendicular to the outer annular flange 22; the top plate 21, the outer annular flange 22, and the baffle 23 are integrally formed.

[0043] In this embodiment, the baffle 23 and the outer annular flange 22 are perpendicularly arranged and both are located outside the top plate 21. When the cover is assembled with the container body 1, the preset interval is formed between the outer surface of the baffle 23, the lower surface of the outer annular flange 22, and the inner surface of the container body 1. The thickness of the cover is 0.5mm to 2.0mm, and the cover is made of metal alloy to meet the requirements of the rotating container operating in a high-speed environment.

[0044] In an optional embodiment of the present invention, the sealing ring 4 is an L-shaped ring structure; the sealing ring 4 includes a sealing ring body 41 and an inner annular flange 42 fixedly connected to the sealing ring body 41; the radial thickness of the inner annular flange 42 is the same as the thickness of the baffle 23.

[0045] In this embodiment, the sealing ring body 41 and the inner annular flange 42 are integrally formed.

[0046] In this embodiment, as Figure 3As shown, the sealing ring 4 has an L-shaped ring structure with an outer diameter larger than the inner diameter of the container body 1, and can be fixedly connected to the container body 1 by an interference fit. The thickness of the sealing ring body 41 is 0.5mm to 1.0mm, and the height is 4mm to 10mm; the thickness of the inner annular flange 42 is the same as the thickness of the baffle 23, so that the inner surface of the baffle 23 and the free end of the inner annular flange 42 are in the same vertical plane; the sealing ring 4 is made of metal alloy, thereby ensuring the high-speed operation requirements of the container body 1.

[0047] In one embodiment of the present invention, the sealing ring 3 has an annular structure and a D-shaped cross-section; the sealing ring 3 includes a straight section 31, one end of the straight section 31 is connected to one end of a first arc section 32, the other end of the first arc section 32 is connected to one end of a second arc section 33, the other end of the second arc section 33 is connected to one end of a third arc section 34, and the third arc section 34 is connected to the other end of the straight section 31.

[0048] In one embodiment of the present invention, the first arc segment 32 is an arc with a radius of 0.2 mm to 1.0 mm; the second arc segment 33 is an arc with a radius of 3 mm to 10 mm; and the third arc segment 34 is an arc with a radius of 0.2 mm to 1.0 mm.

[0049] In this embodiment, as Figure 2 As shown, the straight section 31, the first arc section 32, the second arc section 33, and the third arc section 34 are connected end to end to form a D-shaped annular sealing ring. The first arc section 32 and the third arc section 34 have the same curvature, while the curvature of the second arc section 33 is greater than that of the first arc section 32 and the third arc section 34. Compared to the regular shapes such as rectangular, circular, and elliptical cross-sections used in general sealing designs, the D-shaped cross-section simultaneously satisfies the strong adhesion between the straight section 31 and the outer surface of the baffle 23, the large compressive deformation of the second arc section 33 and the container body 1 under high-speed operation, and the low contact pressure between the third arc section 34 and the sealing ring body 41. Specifically, the strong adhesion ensures that the sealing ring 3 does not slip during assembly, the large compressive deformation provides sufficient sealing reliability, and the low contact pressure ensures that the sealing ring 4 does not slip axially during high-speed operation, thus simultaneously achieving good assembly processability, sealing performance, and structural stability.

[0050] The sealing ring 3 has a thickness of 0.5 to 1.0 mm and a height of 4 to 10 mm. The inner diameter of the sealing ring 3 in its natural state is 10% to 30% smaller than the outer diameter of the baffle 23. This allows the sealing ring 3 to have a certain tension when it is assembled on the baffle 23, which facilitates bonding and fixing the position, thereby improving the assembly processability of the rotating container.

[0051] In one embodiment of the present invention, the second arc segment 33 is connected to the inner surface of the container body 1 by an interference fit; the outer surface of the sealing ring body 41 is connected to the inner surface of the container body 1 by an interference fit; and the inner surface of the sealing ring body 41 is connected to the outer surface of the baffle 23 by an interference fit.

[0052] In one embodiment of the present invention, the interference between the outer surface of the sealing ring body 41 and the inner surface of the container body 1 is greater than the interference between the inner surface of the sealing ring body 41 and the outer surface of the baffle 23; the interference between the inner surface of the sealing ring body 41 and the outer surface of the baffle 23 is greater than the interference between the second arc segment 33 and the inner surface of the container body.

[0053] In this embodiment, a larger interference fit results in greater prestress between the sealing retaining ring 4, the sealing ring 3, and the cover 2, leading to lower structural stress and higher strength reliability during high-speed rotation. While a larger interference fit results in lower structural stress and higher strength reliability, it also increases the difficulty of assembling the sealing structure. Especially for the structure involving interference fits between multiple components in this application, the feasibility of the process must be fully considered; therefore, the interference fit value cannot be too high. In summary, the determination of the interference fit should balance the requirements of structural reliability and assembly processability.

[0054] In this embodiment, the outer surface of the sealing ring body 41 is fixedly connected to the container body 1 by an interference fit, with an interference amount of 0.3mm to 0.5mm; the inner surface of the sealing ring body 41 is fixedly connected to the outer surface of the baffle 23 by an interference fit, with an interference amount of 0.2mm to 0.3mm; and the inner surface of the sealing ring body 41 is fixedly connected to the outer surface of the baffle 23 by an interference fit, with an interference amount of 0.1mm to 0.2mm.

[0055] By employing a design scheme where the interference fit decreases radially from the outside to the inside of the rotating container, two advantages are achieved. First, the stress on the inner and outer components approaches an ideal state of equal stress during high-speed rotation, enhancing structural reliability. Second, components with larger interference fits are assembled first, followed by components with relatively smaller interference fits, resulting in a sealing structure with good manufacturability and reliability.

[0056] In one embodiment of the present invention, the roughness of the inner surface of the container body 1 and the outer surface of the baffle 23 both do not exceed 1.6 μm, in order to ensure sealing.

[0057] In this embodiment, in order to ensure the airtightness of the rotating instrument, the roughness of the inner surface of the container body 1 and the outer surface of the baffle 23 does not exceed 1.6 μm.

[0058] In a specific embodiment of the present invention, the container body 1 is made of high-strength carbon fiber composite material, the cap 2 and the sealing ring 4 are both made of high-strength aluminum alloy, and the sealing rubber ring 3 is made of nitrile rubber;

[0059] The sealing ring body 41 has a radial thickness of 0.6 mm and an axial height of 7 mm.

[0060] The thickness of the baffle 23 is 0.8 mm, which is the same as the thickness of the inner annular flange 42;

[0061] The container body 1 has a thickness of 10mm and a diameter of 800mm;

[0062] The sealing ring 3 has a radial thickness of 0.7 mm, an axial height of 8 mm, and a diameter of 160 mm in its natural state.

[0063] The first arc segment 32 has an arc with a radius of 1 mm, the second arc segment 33 has an arc with a radius of 7 mm, and the third arc 34 has an arc with a radius of 1 mm.

[0064] The interference fit between the sealing ring body 41 and the inner surface of the container body 1 is 0.3 mm;

[0065] The interference fit between the outer surface of the baffle 23 and the inner surface of the sealing ring body 41 is 0.2 mm;

[0066] The second arc segment 33 and the container body 1 are interference fit, with an interference amount of 0.1 mm;

[0067] The roughness of the baffle 23 is 1.6 μm; the roughness of the inner surface of the container body 1 is 1.6 μm.

[0068] Embodiments of the present invention also provide a method for assembling a sealing structure, comprising:

[0069] Step S1: Bond the straight section 31 to the upper part of the outer surface of the baffle 23 and cure it;

[0070] Step S2: Adhere the outer surface of the sealing ring body 41 to the inner surface of the container body 1;

[0071] Step S3: When the outer surface of the sealing ring body 41 is bonded to the inner surface of the container body 1 and has not yet cured, the cap with the sealing ring 3 bonded to it is press-fitted to the container body 1 with the sealing ring 4 bonded to it.

[0072] Step S4: Push the cap downwards until the lower surface of the outer annular flange 22 contacts the container body 1, thereby moving the sealing ring to the final fixed position;

[0073] Step S5: Wait for the outer surface of the vertical ring sealing ring body 41 to bond and cure with the inner surface of the container body 1.

[0074] In one embodiment of the present invention, in step S3, when the container body 1 with the sealing ring 3 and the sealing retaining ring 4 are assembled with an interference fit, the lower surface of the outer annular flange 22 is located 0.2mm to 0.5mm from the top of the container body 1.

[0075] In this embodiment, by pushing the cap to which the sealing ring 3 is bonded downward, the sealing ring 3 comes into contact with the sealing retaining ring 4 and the sealing retaining ring 4 is pushed downward to its final position.

[0076] In this embodiment, existing adhesives such as AB glue can be used to bond the sealing ring 3 to the outer surface of the baffle 23 and to bond the outer surface of the sealing ring body 41 to the inner surface of the container body 1.

[0077] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the 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 seal structure for a rotating vessel, characterized by, include: Container body (1); A cap is fixed to the end of the container body (1), and a preset interval is provided between the container body (1) and the cap; A sealing ring (3) is fixedly connected to the cover. A sealing ring (4) is fixedly connected to the container body (1); The end of the sealing ring (4) contacts the end of the sealing ring (3), and the sealing ring (3) is fixed inside the preset interval by the sealing ring (4); The cover includes: a top plate (21); The outer annular flange (22) is connected to the edge of the top plate (21); A baffle (23) that is connected to the edge of the top plate (21) and perpendicular to the outer annular flange (22); The top plate (21), the outer annular flange (22), and the baffle (23) are integrally formed; The sealing ring (4) has an L-shaped ring structure; The sealing ring (4) includes: a sealing ring body (41); An inner annular flange (42) integrally formed with the sealing ring body (41). The radial thickness of the inner annular flange (42) is the same as the thickness of the baffle (23); The sealing ring (3) has an annular structure and a D-shaped cross-section; The sealing ring (3) includes: a straight section (31), one end of which is connected to one end of the first arc section (32); The other end of the first arc segment (32) is connected to one end of the second arc segment (33), the other end of the second arc segment (33) is connected to one end of the third arc segment (34), and the other end of the third arc segment (34) is connected to the other end of the straight segment (31). The second arc segment (33) is connected to the inner surface of the container body (1) by an interference fit; The outer surface of the sealing ring body (41) is connected to the inner surface of the container body (1) by an interference fit; The inner surface of the sealing ring body (41) is connected to the outer surface of the baffle (23) by an interference fit; The interference fit between the outer surface of the sealing ring body (41) and the inner surface of the container body (1) is greater than the interference fit between the inner surface of the sealing ring body (41) and the outer surface of the baffle (23); The interference fit between the inner surface of the sealing ring body (41) and the outer surface of the baffle (23) is greater than the interference fit between the second arc segment (33) and the inner surface of the container body (1).

2. The sealing structure as described in claim 1, characterized in that: The first arc segment (32) is an arc with a radius of 0.2mm to 1.0mm; The second arc segment (33) is an arc with a radius of 3mm to 10mm; The third arc segment (34) is an arc with a radius of 0.2mm to 1.0mm.

3. The sealing structure as described in claim 1, characterized in that: The roughness of the inner surface of the container body (1) and the outer surface of the baffle (23) does not exceed 1.6 μm, in order to ensure the sealing of the container body (1).

4. A method of assembling a seal structure, characterized by, Applied to the sealing structure as described in any one of claims 1 to 3, comprising: Step S1: Bond and cure the straight section (31) to the upper part of the outer surface of the baffle (23); Step S2: Adhere the outer surface of the sealing ring body (41) to the inner surface of the container body (1); Step S3: When the outer surface of the sealing ring body (41) is bonded to the inner surface of the container body (1) and has not been cured, the cap with the sealing ring (3) bonded to it is press-fitted to the container body (1) with the sealing ring (4) bonded to it. Step S4: Push the cap downwards until the lower surface of the outer annular flange (22) contacts the container body (1), thereby moving the sealing ring (4) to the final fixed position; Step S5: Wait for the adhesive on the outer surface of the sealing ring body (41) and the inner surface of the container body (1) to cure.

5. The sealing structure assembly method as described in claim 4, characterized in that: In step S3, when the cap with the sealing ring (3) is bonded to the container body (1) with the sealing retaining ring (4) bonded to it is press-fitted, the lower surface of the outer annular flange (22) is located 0.2mm to 0.5mm from the top of the container body (1).

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