Corrugated pipe sealing hard ring inlaying ring seat
By designing the bellows sealed hard ring inlay ring seat, canceling the bottom of the ring seat, realizing direct contact between the bellows and the ring sheet, combining the connection structure and groove design, the problem of uneven inlay stress distribution of the traditional sealing ring is solved, and sealing performance and reliability are improved.
Patent Information
- Application Number
- CN202421331463.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-12
AI Technical Summary
In the traditional bellows sealing ring inlay structure, the uneven deformation of the ring seat leads to the uneven distribution of the inlay stress, which affects the sealing performance. Especially in high-temperature environments, the change in stress distribution leads to the deterioration of the flatness of the end face and the deterioration of the sealing performance.
A corrugated tube sealed hard ring inlay ring seat is designed to cancel the thicker bottom of the ring seat, so that the bellows directly match the ring sheet, achieving uniformity of stress distribution, and by setting connection structures and grooves at the connection between the ring seat and the bellows, weld stress is compensated to ensure uniform stress.
The uniform stress distribution of the sealing ring is achieved, the straightness of the end surface is stabilized, and the sealing performance is improved. Especially in high temperature environments, the sealing reliability is ensured.
Smart Images
Figure CN222668878U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bellows ring seats, in particular to a bellows sealing hard ring inlaid ring seat. Background Art
[0002] Welded metal bellows seals require welding of the wave plate with the sealing ring, and the sealing end face is usually not weldable, so only the metal ring seat inlay structure can be used. The traditional structure of the bellows seal ring inlay structure. The ring seat is a bowl-shaped structure, the outer thin wall part is the inlay part, and the bottom is relatively thick. The inlay is achieved through interference fit, and the ring plate and the ring seat will have a certain deformation, generating assembly stress between each other, thereby achieving the sealing and transmission functions.
[0003] Since the elastic modulus of the graphite ring is much lower than that of the ring seat metal, most of the deformation during the embedding process occurs on the graphite ring, and the deformation of the ring seat is very small, resulting in a relatively uniform embedding stress.
[0004] However, the elastic modulus of hard rings such as cemented carbide is much higher than that of the ring seat metal, so the embedding deformation mainly occurs on the ring seat. The thin-walled outer edge of the ring seat deforms outward more greatly. Since the bottom cross-section of the ring seat is relatively large and basically does not deform, a trumpet-shaped tapered hole is formed on the thin-walled outer edge. Obviously, the embedding stress distribution is uneven at this time.
[0005] After the sealing ring is embedded, it usually needs to go through a heat treatment process to eliminate residual stress and stabilize the stress state of the end face, but this unbalanced stress distribution state cannot be changed. After the heat treatment process, the end face is ground to achieve a high degree of straightness to meet the sealing requirements. The grinding is carried out at room temperature.
[0006] When the embedded sealing ring is used, as the temperature gradually rises, due to the different linear expansion coefficients of the ring seat and the ring piece, the expansion amplitude of the metal ring seat with a larger linear expansion coefficient is smaller than that of the ring piece with a smaller linear expansion coefficient, so the interference is reduced, the stress is reduced, the trumpet shape of the ring seat is reduced, and the stress distribution tends to be balanced. This change in the stress size and distribution balance of the embedded part will deteriorate the flatness of the end face, making the sealing performance worse under high temperature conditions. The traditional bowl-shaped ring seat cannot avoid this shortcoming.
[0007] In order to solve the above problems, we propose a bellows sealing hard ring embedded ring seat. Utility Model Content
[0008] The utility model aims to provide a bellows sealing hard ring embedded ring seat to solve the problems raised in the above background technology.
[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bellows sealing hard ring embedded ring seat, comprising a bellows, a ring seat and a ring sheet; the ring seat is sleeved on the outer side wall of the ring sheet; the edge of the bellows is connected to one end face of the ring seat.
[0010] Preferably, the ring seat and the ring sheet are interference fit.
[0011] Preferably, a connecting structure is provided at the connection between the ring seat and the bellows.
[0012] Preferably, the end surface of the ring sheet close to the bellows is flush with the end surface of the connecting structure connected to the bellows.
[0013] Preferably, an outer side wall of the connection structure is provided with an oblique opening near one end surface of the corrugated pipe.
[0014] Compared with the prior art, the utility model has the beneficial effects that the bellows sealing hard ring embedded ring seat eliminates the thicker ring seat bottom, so that the bellows is directly against the ring sheet, the stress distribution is uniform, and the overall structure is more suitable for use in high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a partial cross-sectional structural schematic diagram of the utility model;
[0016] Figure 2 It is the stress diagram of the utility model;
[0017] Figure 3 Schematic diagram of the ideal structure of the ring seat and the ring piece.
[0018] In the figure: 1- bellows, 2- ring seat, 21- connecting structure, 22- groove, 3- ring sheet. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] See also Figure 1 , Figure 2 The utility model provides a technical solution: a bellows sealing hard ring embedded ring seat, comprising a bellows 1, a ring seat 2 and a ring sheet 3; the ring seat 2 is sleeved on the outer side wall of the ring sheet 3; the edge of the bellows 1 is connected to one end face of the ring seat 2.
[0021] Furthermore, the ring seat 2 and the ring sheet 3 are interference fit.
[0022] Furthermore, a connection structure 21 is provided at the connection between the ring seat 2 and the bellows 1 .
[0023] Furthermore, the end surface of the ring sheet 3 close to the bellows 1 is flush with the end surface of the connecting structure 21 connected to the bellows 1 .
[0024] Furthermore, a groove 22 is provided on the outer side wall of the connection structure 21 near one end surface of the corrugated tube 1. Figure 3 The structure shown is an ideal structure, and the stress distribution of the room temperature embedding is uniform. In actual application, the bellows 1 must be welded to the ring seat 2, so a weld needs to be provided at the connection between the ring seat 2 and the bellows 1. After the ring seat 2 is provided with a weld, it will affect the overall stress distribution, resulting in uneven stress. At this time, it is necessary to open a groove 22 to compensate for the stress at this location, so that the stress of the ring seat 2 is uniform. In the present utility model, the shape of the groove 22 is not limited.
[0025] The bottom of the traditional ring seat bowl structure is thicker, which can improve the rigidity of the entire sealing ring. In the prior art, it is very necessary for the graphite ring sheet because the elastic modulus of the graphite ring sheet is small, while for the hard ring sheet with a large elastic modulus, the ring sheet itself has a high rigidity and this function can be omitted.
[0026] From the above analysis, it can be seen that the root cause of the uneven distribution of the inlay stress in the traditional structure inlay ring seat is that the ring seat has a thick bottom. The ideal inlay structure is to remove the bottom and only retain a small cross-section rectangular thin-walled part, such as Figure 3 As shown. With such a structure, the stress distribution at room temperature is uniform. When the temperature changes, the stress will change due to the difference in linear expansion coefficients between the ring seat and the ring sheet, but the distribution is still uniform. This ensures the stability of the flatness of the end face, thereby ensuring that the seal has a high flatness under different operating temperature conditions and improving the reliability of the seal.
[0027] In the present invention, the ring seat 2 is welded to the bellows 1, so a weld joint structure, namely the connection structure 21, is required. The weld joint position of the connection structure 21 is flush with the end face of the ring sheet 3. The ring seat 2 needs to be extended with a thin wall. In order to offset the effect of the extension, a slope is made near the weld joint, that is, the groove 22 is provided. It should be noted here that the slope near the weld joint is based on Figure 1 The description is not limited to the shape of the groove 22 being an oblique groove. This description is just an example to make it clearer.
[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A bellows seal hard ring embedded ring seat, characterized in that: It comprises a bellows (1), a ring seat (2) and a ring sheet (3); the ring seat (2) is sleeved on the outer side wall of the ring sheet (3); and the edge of the bellows (1) is connected to one end face of the ring seat (2).
2. A bellows seal hard ring embedded ring seat according to claim 1, characterized in that: The ring seat (2) and the ring sheet (3) are interference fit.
3. The bellows seal hard ring embedded ring seat according to claim 1, characterized in that: A connection structure (21) is provided at the connection point between the ring seat (2) and the bellows (1).
4. A bellows seal hard ring embedded ring seat according to claim 3, characterized in that: The end surface of the ring sheet (3) close to the bellows (1) is flush with the end surface of the connecting structure (21) connected to the bellows (1).
5. The bellows seal hard ring embedded ring seat according to claim 3, characterized in that: A groove (22) is provided on the outer side wall of the connection structure (21) near an end surface of the corrugated tube (1).