Sealing device
By using fastening components and double metal sealing rings in the sealing device, combined with disc springs and sealing grooves, the sealing performance problems of traditional sealing structures under high temperature, high pressure and pressure fluctuation conditions are solved, and more stable sealing performance is achieved. Leak detection, suitable for high temperature and high pressure conditions.
Patent Information
- Application Number
- CN202420999016.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The traditional sealing structure cannot guarantee the sealing performance under high temperature and high pressure and rapid pressure fluctuations in pressure, and the difference in thermal expansion coefficient between the stud and the flange ring material leads to excessive thermal stress, affecting the sealing performance.
The fastening components include studs, nuts and disc springs, and are combined with a double metal sealing ring to form a double sealing structure to relieve the thermal stress caused by different thermal expansion coefficients of the studs, add disc springs to absorb deformation, and in the sealing device Seal grooves and channel holes are provided in the room to detect leakage.
Effectively alleviates the stress exceeding the standard of studs and improves sealing performance. It is suitable for high temperature and high pressure and rapid pressure fluctuations in pressure. It has simple structure and is easy to manufacture and maintain, and is universal to prevent leakage of toxic media.
Smart Images
Figure CN222363422U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of static sealing, in particular to a sealing device. Background Art
[0002] In actual production, there are more and more working conditions with high temperature, high pressure and transient pressure fluctuations, and the sealing structure of traditional mechanical equipment cannot guarantee the reliability of sealing performance. For example, self-tightening seals mainly rely on the increase of medium pressure to increase sealing performance. Although the stud load is small, this structure is usually more complicated and not easy to manufacture, install and maintain. It cannot be adopted in large quantities and lacks universality, such as Wood seals. In addition to self-tightening seals, conventional forced seals or semi-self-tightening seals are suitable for steady-state high temperature and high pressure conditions, and can also guarantee sealing performance for small pressure and temperature fluctuations, but the sealing effect is often poor in the case of transient pressure fluctuations.
[0003] Conventional sealing structures have only one sealing gasket. Once leakage occurs, the medium will flow directly into the atmosphere. This is not allowed for toxic, flammable, explosive and other media or other situations where leakage is not allowed. If the thermal expansion coefficients of the stud and flange ring materials are very different, the thermal stress generated at high temperatures will be very large, even much greater than the required sealing load, which will cause the allowable stress of the stud to exceed the standard. For example, the flange ring material is austenitic stainless steel that is resistant to medium corrosion, and the stud material is high-strength steel. At high temperatures, the thermal expansion coefficient of the former is higher than that of the latter. The axial elongation is limited by the nut, and the generated thermal stress is borne by the stud, which can easily cause the stud stress to exceed the allowable requirements, thereby affecting the sealing performance. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a sealing device which is suitable for high temperature and high pressure working conditions and can cope with the working conditions of transient and rapid pressure fluctuations.
[0005] The technical solution adopted by the utility model to solve the technical problem is: to provide a sealing device, including at least one set of fastening components fastened between a first part to be sealed and a second part to be sealed, and a first sealing ring and a second sealing ring matched between the sealing surfaces of the first part to be sealed and the second part to be sealed;
[0006] The fastening assembly includes a stud that passes through the first and second parts to be sealed, a nut group that fits on the stud and is located on the surface of the second part to be sealed, and a disc spring that fits on the stud and abuts between the surface of the second part to be sealed and the nut group;
[0007] The fastening assembly forms a sealing boundary between the first and second parts to be sealed, the first and second sealing rings are located inside the sealing boundary, and the second sealing ring is located between the first sealing ring and the fastening assembly.
[0008] Preferably, both the first sealing ring and the second sealing ring are high temperature resistant metal sealing rings.
[0009] Preferably, the first sealing ring is a C-type sealing ring or an O-type sealing ring.
[0010] Preferably, the second sealing ring is a C-type sealing ring or an O-type sealing ring.
[0011] Preferably, the nut set includes a main nut and a locking nut; on the stud, the main nut is located between the disc spring and the locking nut.
[0012] Preferably, the height of the main nut itself is greater than the height of the locking nut itself.
[0013] Preferably, the sealing device comprises at least two groups of the fastening assemblies; and the at least two groups of the fastening assemblies are arranged at intervals along the circumference of the first component to be sealed.
[0014] Preferably, the sealing device further comprises a first sealing groove and a second sealing groove provided on the sealing surface of the first member to be sealed and / or the second member to be sealed;
[0015] The first sealing ring and the second sealing ring are respectively accommodated in the first sealing groove and the second sealing groove.
[0016] Preferably, the first member to be sealed comprises a cylindrical end; and the second member to be sealed comprises a cover or a flange fitted on an opening of the cylindrical end.
[0017] Preferably, a channel hole for connecting a leakage rate detection instrument is provided on the second component to be sealed, and the channel hole passes through the second component to be sealed and communicates with the area between the second sealing ring and the first sealing ring.
[0018] The sealing device of the utility model is suitable for high temperature and high pressure working conditions and working conditions of transient and rapid pressure fluctuations by adding disc springs to the fastening components and cooperating with double-pass sealing rings. It can also alleviate the excessive thermal stress generated by the different thermal expansion coefficients of the studs and the sealed parts, thereby ensuring the sealing performance of the sealing device.
[0019] The sealing device of the utility model has a simple structure, is easy to manufacture, install and maintain, and has universal applicability. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0021] Figure 1 This is a schematic structural diagram of a sealing device according to an embodiment of the utility model on a component to be sealed;
[0022] Figure 2 yes Figure 1 An enlarged structural diagram of the part where the middle disc spring is located;
[0023] Figure 3 yes Figure 1 A schematic structural diagram of an embodiment of a first sealing ring and a second sealing ring;
[0024] Figure 4 yes Figure 1 A schematic structural diagram of another embodiment of the first sealing ring and the second sealing ring. DETAILED DESCRIPTION
[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.
[0026] The sealing device of the utility model is used for sealing connection between two parts to be sealed, fastening and sealing the two parts to be sealed together to form a statically sealed connection assembly, and is suitable for working conditions of high temperature, high pressure and transient and rapid pressure fluctuations.
[0027] like Figure 1-Figure 3 As shown, a sealing device according to an embodiment of the present invention may include at least one set of fastening components 30 fastened between a first part to be sealed 100 and a second part to be sealed 200, and a first sealing ring 10 and a second sealing ring 20 fitted between the sealing surfaces of the first part to be sealed 100 and the second part to be sealed 200.
[0028] The fastening assembly 30 is used to connect between the first to-be-sealed member 100 and the second to-be-sealed member 200, fasten the first to-be-sealed member 100 and the second to-be-sealed member 200, and serve as a sealing boundary between the first to-be-sealed member 100 and the second to-be-sealed member 200. The number of fastening assemblies 30 is determined according to the sealing requirements of different first to-be-sealed members 100 and the second to-be-sealed member 200. When there are two or more sets of fastening assemblies 30, the two or more sets of fastening assemblies 30 are preferably arranged at intervals along the circumference of the first to-be-sealed member 100, so as to form a sealing boundary extending circumferentially.
[0029] Between the sealing surfaces of the first component to be sealed 100 and the second component to be sealed 200, the first sealing ring 10 and the second sealing ring 20 are located on the inner side of the sealing boundary, forming a double-line seal on the sealing surface. The second sealing ring 20 is located between the first sealing ring 10 and the fastening assembly 30, that is, the first sealing ring 10 is located in the inner ring of the second sealing ring 20, as an inner sealing ring, and plays the main sealing role; the second sealing ring 20, as an outer sealing ring, plays an auxiliary sealing role, effectively preventing the failure of a single-line seal from causing a large amount of toxic or flammable and explosive media to leak into the atmosphere.
[0030] Specifically, the fastening assembly 30 may include a stud 31, a nut group matched with the stud 31, and a disc spring 32. The stud 31 is connected to the first to-be-sealed member 100 and the second to-be-sealed member 200, and the thread on the stud 31 is matched with the threaded holes on the first to-be-sealed member 100 and the second to-be-sealed member 200 to form a fastened connection; during installation, the stud 31 passes through the threaded holes of the second to-be-sealed member 200 and the first to-be-sealed member 100 in sequence from the second to-be-sealed member 200. The disc spring 32 is matched with the stud 31 and abuts on the surface of the second to-be-sealed member 200 away from the first to-be-sealed member 100; the nut group is matched with the stud 31 and abuts on the disc spring 32 to play a locking role.
[0031] In some embodiments, the nut group may include a main nut 33 and a locking nut 34; during installation, the main nut 33 is first fitted onto the stud 31 and abutted against the top of the disc spring 32, and then the locking nut 34 is fitted and locked onto the stud 31 and abutted against the top of the main nut 33, so that on the stud 31, the main nut 33 is located between the disc spring 32 and the locking nut 34.
[0032] According to different main functions and for easy distinction, the height (also axial length or thickness) of the main nut 33 can be set greater than the height of the locking nut 34, that is, the height of the main nut 33 itself is greater than the height of the locking nut 34 itself.
[0033] In actual production, including nuclear power plants and other occasions, the thermal expansion coefficient of the second sealed component 200 is usually greater than the thermal expansion coefficient of the fastening assembly 30. In the present utility model, a disc spring 32 is added to the fastening assembly 30. The disc spring 32 serves as a sealing auxiliary component, which can absorb the partial deformation difference caused by the different thermal expansion coefficients of the materials of the stud 31 and the second sealed component 200 at high temperatures, thereby reducing the thermal stress on the stud 31. In addition, the disc spring 32 itself is mainly used in working conditions of high temperature, high pressure and transient rapid pressure fluctuations.
[0034] The disc spring 32 bears the axial load through the main nut 33 and the stud 31. The load is static at the beginning. After being compressed and deformed, a part of the deformation energy is stored. Later, as the equipment is running, the axial load becomes a dynamic load. The disc spring 32 undergoes corresponding elastic deformation changes with the dynamic load to store and release the deformation energy. The actual form of expression is that when the stud 31 becomes loose or the first to-be-sealed component 100 and the second to-be-sealed component 200 tend to separate, the disc spring 32 releases the deformation energy to become the additional load required to compensate for the seal. In this way, the disc spring 32 solves the impact load caused by the transient and sharp fluctuation of pressure, which leads to the separation of the first to-be-sealed component 100 and the second to-be-sealed component 200, or the creep relaxation of the stud 31 under long-term high temperature conditions.
[0035] The locking nut 34 serves to strengthen the tightness of the connection between the main nut 33 and the stud 31. The stud 31 is preferably in the form of a bolt tensioner to achieve precise control of the axial load to ensure sealing. The selection of the disc spring 32 needs to be calculated based on the specific load and deformation.
[0036] The first sealing ring 10 and the second sealing ring 20 are arranged between the sealing surfaces of the first to-be-sealed component 100 and the second to-be-sealed component 200, realizing a double sealing structure. The first sealing ring 10 and the second sealing ring 20 are suitable for high temperature and high pressure working conditions. The first sealing ring 10 and the second sealing ring 20 are both high temperature resistant metal sealing rings and have certain resilience. Alternatively, the first sealing ring 10 can be a C-type sealing ring or an O-type sealing ring; the second sealing ring 20 can be a C-type sealing ring or an O-type sealing ring.
[0037] In one embodiment, if Figure 3 As shown, the first sealing ring 10 is an O-type sealing ring, and the second sealing ring 20 is a C-type sealing ring. Figure 4 As shown, the first sealing ring 10 and the second sealing ring 20 are both C-type sealing rings.
[0038] The first sealing ring 10 and the second sealing ring 20 have the characteristics of semi-self-tightening or self-tightening sealing, which are suitable for fluctuating working conditions. In this way, the two seals formed by the first sealing ring 10 and the second sealing ring 20 can be applied to stable high-temperature and high-pressure working conditions, and can also further cope with working conditions with transient and rapid changes in pressure.
[0039] Combination Figure 1 and Figure 3 Corresponding to the first sealing ring 10 and the second sealing ring 20, the sealing device may also include a first sealing groove 101 and a second sealing groove 102 arranged on the sealing surface of the first component to be sealed 100 and / or the second component to be sealed 200; the first sealing ring 10 and the second sealing ring 20 are respectively accommodated in the first sealing groove 101 and the second sealing groove 102.
[0040] When there is a need to detect leakage in real time, a leakage rate detection instrument can be connected to the area between the first sealing ring 10 and the second sealing ring 20 to detect leakage in the area, thereby determining whether the first sealing ring 10 is leaking.
[0041] In order to connect the leakage rate detection instrument, a channel hole is provided on the second component to be sealed 200 , and the channel hole passes through the second component to be sealed 200 and communicates with the area between the second sealing ring 20 and the first sealing ring 10 .
[0042] In some embodiments, the first sealed member 100 includes a cylindrical end, and the second sealed member 200 includes a cover or flange that fits on the opening of the cylindrical end. The fastening components 30 are distributed at intervals along the circumference of the cylindrical end, and the cover or flange is fastened to the cylindrical end to seal the internal channel of the cylindrical end. The first sealing ring 10 and the second sealing ring 20 form a double-pass seal on the sealing surface of the cylindrical end to further improve the sealing performance.
[0043] It can be understood that the cylindrical end can be formed on any equipment that needs to be sealed, such as pipes, tanks, etc.
[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A sealing device, characterized in that: It comprises at least one set of fastening components fastened between a first part to be sealed and a second part to be sealed, and a first sealing ring and a second sealing ring fitted between the sealing surfaces of the first part to be sealed and the second part to be sealed; The fastening assembly includes a stud that passes through the first and second parts to be sealed, a nut group that fits on the stud and is located on the surface of the second part to be sealed, and a disc spring that fits on the stud and abuts between the surface of the second part to be sealed and the nut group; The fastening assembly forms a sealing boundary between the first and second parts to be sealed, the first and second sealing rings are located inside the sealing boundary, and the second sealing ring is located between the first sealing ring and the fastening assembly.
2. The sealing device according to claim 1, characterized in that: The first sealing ring and the second sealing ring are both high temperature resistant metal sealing rings.
3. The sealing device according to claim 2, characterized in that: The first sealing ring is a C-type sealing ring or an O-type sealing ring.
4. The sealing device according to claim 2, characterized in that: The second sealing ring is a C-type sealing ring or an O-type sealing ring.
5. The sealing device according to claim 1, characterized in that: The nut set includes a main nut and a locking nut; on the stud, the main nut is located between the disc spring and the locking nut.
6. The sealing device according to claim 5, characterized in that: The height of the main nut itself is greater than the height of the locking nut itself.
7. The sealing device according to any one of claims 1 to 6, characterized in that: The sealing device comprises at least two groups of the fastening components; the at least two groups of the fastening components are arranged at intervals along the circumference of the first component to be sealed.
8. The sealing device according to any one of claims 1 to 6, characterized in that: The sealing device further comprises a first sealing groove and a second sealing groove provided on the sealing surface of the first to-be-sealed member and / or the second to-be-sealed member; The first sealing ring and the second sealing ring are respectively accommodated in the first sealing groove and the second sealing groove.
9. The sealing device according to any one of claims 1 to 6, characterized in that: The first member to be sealed includes a cylindrical end; the second member to be sealed includes a cover or a flange fitted on an opening of the cylindrical end.
10. The sealing device according to any one of claims 1 to 6, characterized in that: The second component to be sealed is provided with a channel hole for connecting a leakage rate detection instrument. The channel hole passes through the second component to be sealed and communicates with the area between the second sealing ring and the first sealing ring.