Double-end-face mechanical sealing structure

Abstract

The invention relates to the technical field of mechanical sealing, and discloses a double-end-face mechanical sealing structure which comprises a rotating shaft, a sleeve is arranged on the outer side of one end of the rotating shaft in a sleeving mode, a first pairing ring is arranged on the outer side of the sleeve in a sleeving mode, and a cover ring is arranged on the outer side of the first pairing ring in a sleeving mode; a pump ring is arranged on the inner side of the middle of the cover ring. A second pairing ring is arranged at one end of the pump ring. The outer side of the cover ring is sleeved with a flange seat; a third elastic ring is arranged on the inner side of one end of the flange seat, and a spring fixer is arranged at one end of the third elastic ring. Through double-end-face mechanical sealing and modular design, the effect that efficient sealing performance and economical efficiency coexist is achieved, due to the unique flange base design, when a sealing piece is replaced, the flange base does not need to be wholly replaced, and the maintenance cost is remarkably reduced; the wave spring and the spring are externally arranged, so that the adaptability of the seal under severe working conditions such as high temperature, high pressure and particle-containing media is enhanced, and the problems of blockage and corrosion are effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a double-end-face mechanical seal structure. Background Art

[0002] As a key sealing component in industrial equipment, mechanical seals are widely used in pumps, mixers, compressors and other equipment. Their main function is to solve the problem of medium leakage between rotating shafts and stationary parts. In the industrial field, especially in complex working conditions of handling high temperature, high pressure and corrosive media, the performance of mechanical seals not only directly affects the operating stability of the equipment, but also has an important impact on the safety, efficiency and economic benefits of industrial production. For example, in industries such as petrochemicals, pharmaceuticals and food processing, if the seal fails, it may not only lead to equipment downtime and high maintenance costs, but also cause environmental pollution or safety accidents.

[0003] However, traditional mechanical seals have many problems in practical applications, among which high maintenance costs and component design defects are the most prominent. The flange seat in the traditional mechanical seal, as a fixing and supporting component in the sealing structure, usually adopts an integrated design and is tightly connected to other sealing components. This design has a certain stability during operation, but when the seal is damaged and needs to be replaced, the flange seat and related components must be replaced as a whole. This non-modular design method not only increases the complexity of maintenance, but also greatly increases the maintenance costs. Especially under conditions of frequent replacement, the overall replacement of the flange seat poses a great challenge to the economic efficiency of equipment operation. In addition, the disassembly and assembly process of the integrated flange seat design is complicated, and often requires professional tools and personnel support, which further increases equipment downtime and labor costs.

[0004] Therefore, the traditional mechanical seal design is particularly insufficient when facing high-frequency maintenance or harsh environments, which has prompted the industry to have a strong demand for mechanical seal solutions with modular design, reduced maintenance costs and improved adaptability to working conditions. Therefore, the present invention proposes a double-end mechanical seal structure. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a double-end surface mechanical seal structure to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] A double-end mechanical seal structure comprises a rotating shaft, one end of which is sleeved with a matching sleeve on the outside, and a transmission ring is provided at the outer end of the sleeve; a convex ring is provided at the inner end of the sleeve, and an annular mounting groove is provided on the side of the convex ring, a first sealing ring is embedded in the annular mounting groove, a flange seat is sleeved on the outer periphery of the sleeve, a cover ring is embedded on the side of the flange seat away from the transmission ring, an annular baffle protruding toward the middle is provided on the inner wall of the cover ring, a port of the cover ring away from the flange seat is stepped, a matching stepped first matching ring is movably embedded in the stepped port of the cover ring, and one end of the first matching ring is fitted with the end face of the first sealing ring; a wave spring is provided between the annular baffle of the cover ring and the end face of the first matching ring to press the first matching ring against the end face of the first sealing ring; a sealing ring and a first elastic ring are provided between the step surface of the first matching ring and the step surface of the cover ring;

[0008] A pump ring is clamped on the part corresponding to the cover ring in the middle part of the outer circumference of the sleeve, and the side surface of the pump ring is connected to the second sealing ring mounted on the sleeve; a compression ring is embedded in the flange seat next to the cover ring, and an annular spring fixer is movably embedded in the flange seat on the outside of the compression ring, and a plurality of springs are embedded on the side of the spring fixer close to the transmission ring, and the ends of all the springs are connected to the end face of one side of the third elastic ring, and a positioning convex ring protruding inwardly for positioning the third elastic ring is provided in the flange seat; a second matching ring driven by the spring fixer is movably embedded in the compression ring, and a second sealing ring is embedded in the end face of the pump ring close to the second matching ring, and the spring drives the spring fixer and the second matching ring to press the second sealing ring.

[0009] Furthermore, a second elastic ring is provided between the wave spring and the end surface of the first matching ring.

[0010] Furthermore, the sleeve is connected to the rotating shaft via a driving pin.

[0011] Furthermore, the sleeve and the rotating shaft are connected via a driving pin.

[0012] A gasket is arranged at one end of the middle part of the cover ring, and the gasket and the cover ring, and the transmission ring and the sleeve are all connected by fixing screws.

[0013] Furthermore, O-rings are provided between the sleeve and the rotating shaft, between the sleeve and the first sealing ring, between the sleeve and the pump ring, between the first matching ring and the cover ring, between the pump ring and the second sealing ring, between the cover ring and the flange seat, and between the cover ring and the second matching ring.

[0014] The beneficial effects of the present invention are: through double-end mechanical seals and modular design, the coexistence of efficient sealing performance and economy is achieved. The unique flange seat design eliminates the need to replace the flange seat as a whole when replacing the seal, significantly reducing maintenance costs; the wave spring and spring external design enhance the adaptability of the seal under harsh working conditions such as high temperature, high pressure and medium containing particles, effectively avoiding clogging and corrosion problems. At the same time, the combination of multi-stage sealing structure and O-ring greatly improves the reliability and service life of the seal, ensuring the long-term stable operation of the equipment in complex environments, and providing an efficient, durable and economical solution for industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a structural schematic diagram of a double-end mechanical seal structure according to an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 Side view of.

[0018] In the figure:

[0019] 1. Rotating shaft; 2. Sleeve; 3. First matching ring; 4. Cover ring; 5. First sealing ring; 6. First elastic ring; 7. Second elastic ring; 8. Wave spring; 9. Pump ring; 10. Retaining ring; 11. Second matching ring; 12. Second sealing ring; 13. Flange seat; 14. Compression ring; 15. Transmission ring; 16. Third elastic ring; 17. Spring retainer; 18. Spring; 19. Drive pin; 20. Gasket. DETAILED DESCRIPTION

[0020] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0021] According to an embodiment of the present invention, a double-end mechanical seal structure is provided.

[0022] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 2As shown, a double-end mechanical seal structure according to an embodiment of the present invention comprises a rotating shaft 1, wherein a sleeve 2 matching therewith is sleeved on the outer side of one end of the rotating shaft 1, and a transmission ring 15 is provided at the outer end of the sleeve 2; a convex ring is provided at the inner end of the sleeve 2, and an annular mounting groove is provided on the side of the convex ring, and a first sealing ring 5 is embedded in the annular mounting groove; a flange seat 13 is sleeved on the outer periphery of the sleeve 2, and a cover ring 4 is embedded on the side of the flange seat away from the transmission ring 15, and an annular baffle protruding toward the middle is provided on the inner wall of the cover ring 4, and the port of the cover ring 4 away from the flange seat is stepped, and a matching stepped first matching ring 3 is movably embedded in the stepped port of the cover ring, and one end of the first matching ring 3 is fitted with the end face of the first sealing ring 5; a wave spring 8 for pressing the first matching ring 3 against the end face of the first sealing ring 5 is provided between the annular baffle of the cover ring 4 and the end face of the first matching ring 3; a sealing ring and a first elastic ring 6 are provided between the step surface of the first matching ring 3 and the step surface of the cover ring 4; a second elastic ring 7 is provided between the wave spring 8 and the end face of the first matching ring 3.

[0023] A pump ring 9 is clamped at the part corresponding to the cover ring 4 in the middle part of the outer periphery of the sleeve 2, and the side of the pump ring 9 is connected to the second sealing ring 12 sleeved on the sleeve 4; a compression ring 14 is embedded in the flange seat 13 next to the cover ring, and an annular spring retainer 17 is movably embedded in the flange seat 13 on the outside of the compression ring 14, and a plurality of springs 18 are embedded on the side of the spring retainer 17 close to the transmission ring 15, and the ends of all the springs 18 are connected to the end face of one side of the third elastic ring 16, and a positioning convex ring protruding inwardly for positioning the third elastic ring 16 is provided in the flange seat 13; a second matching ring 11 driven by the spring retainer 17 is movably embedded in the compression ring 14, and a second sealing ring 12 is embedded in the end face of the pump ring 9 close to the second matching ring 11, and the spring 18 drives the spring retainer 17 and the second matching ring 11 to press the second sealing ring 12.

[0024] The sleeve 2 is connected to the rotating shaft 1 through a driving pin 19. A gasket 20 is provided at one end of the middle of the cover ring 4, and the gasket 20 and the cover ring 4, and the transmission ring 15 and the sleeve 2 are connected by screws. O-rings are provided between the sleeve 2 and the rotating shaft 1, between the sleeve 2 and the first sealing ring 5, between the sleeve 2 and the pump ring 9, between the first matching ring 3 and the cover ring 4, between the pump ring 9 and the second sealing ring 12, between the cover ring 4 and the flange seat 13, and between the cover ring 4 and the second matching ring 11.

[0025] In this embodiment, the core function of the double-end mechanical seal structure is to achieve the sealing of the fluid medium and ensure the reliability of the seal and the stability of the equipment operation under harsh working conditions. With respect to the above double-end mechanical seal structure, its principle is analyzed from the following key aspects:

[0026] 1. Sealing principle: Mechanical seals form an efficient sealing surface between the dynamic and static rings through precise matching, and are supported by auxiliary sealing elements (such as O-rings and springs) to avoid leakage. The double-end design here means that sealing components are set at both ends of the equipment, providing higher sealing performance.

[0027] Pairing of the dynamic ring and the static ring: The first pairing ring 3 and the second pairing ring 11 serve as the sealing dynamic ring and the static ring, and realize the main seal through surface contact. The wave spring 8 and the spring 18 provide a stable clamping force for the dynamic ring to ensure that the sealing contact between the dynamic ring and the static ring does not loosen due to running deviation or wear.

[0028] Multi-stage sealing and auxiliary sealing: Multiple O-rings are used for static sealing between sealing surfaces to effectively prevent leakage. The first sealing ring 5 and the second sealing ring 12 at the dynamic ring and pump ring 9 further improve the sealing effect and adapt to high temperature and high pressure environments.

[0029] 2. Elastic design and enhanced adaptability: The spring elements (including the wave spring 8 and the ordinary spring 18) play the role of automatic compensation and enhanced adaptability in the structure.

[0030] Function of the wave spring: The wave spring 8 is installed between the second elastic ring 7 and the cover ring 4, which can alleviate the sealing failure problem caused by temperature changes or medium pressure fluctuations. At the same time, the nonlinear characteristics of the wave spring 8 can provide a more stable pressing force.

[0031] External spring design: The spring 18 provides a force through the spring retainer 17 to keep the second matching ring 11 in contact with the pump ring 9, thereby ensuring the contact force between the sealing rings. This external design effectively reduces the risk of corrosion of the spring exposed to the medium and improves the adaptability of the system.

[0032] 3. Modular design and maintenance convenience: The separate design of the cover ring 4 and the flange seat 13 greatly simplifies the maintenance and replacement of the sealing system.

[0033] Separate flange seat design: A pump ring 9 is provided in the middle of the cover ring 4, and the seal can be replaced by simple disassembly without replacing the flange seat as a whole, thus reducing maintenance costs.

[0034] 4. Adaptability of sealing structure: The double-end mechanical seal is designed to be adaptable to high temperature, high pressure and particle-containing media conditions:

[0035] Multiple protections of O-rings and multiple sealing rings: O-rings at various locations are combined with the first sealing ring 5 and the second sealing ring 12 to effectively reduce leakage caused by particle wear or thermal expansion.

[0036] Wave spring and spring retainer: For media containing particles, the wave spring can tolerate a certain amount of particle accumulation, while the external spring avoids direct contact with the particles, improving durability.

[0037] Modular separation design: When the seal fails in a complex environment, it only needs to replace individual components to restore normal use, reducing operating costs.

[0038] In summary, with the help of the above technical solutions of the present invention, through double-end mechanical seals and modular design, the effect of high-efficiency sealing performance and economy is achieved. The unique flange seat design eliminates the need to replace the flange seat as a whole when replacing the seal, significantly reducing maintenance costs; the wave spring and external spring design enhance the adaptability of the seal under harsh working conditions such as high temperature, high pressure and medium containing particles, effectively avoiding clogging and corrosion problems. At the same time, the combination of multi-stage sealing structure and O-ring greatly improves the reliability and service life of the seal, ensuring the long-term stable operation of the equipment in complex environments, and providing an efficient, durable and economical solution for industrial applications.

[0039] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-end mechanical seal structure, comprising a rotating shaft, characterized in that: A matching sleeve is sleeved on the outer side of one end of the rotating shaft, and a transmission ring is provided on the outer end of the sleeve; a convex ring is provided on the inner end of the sleeve, and an annular mounting groove is provided on the side of the convex ring, and a first sealing ring is embedded in the annular mounting groove; a flange seat is sleeved on the outer periphery of the sleeve, and a cover ring is embedded on the side of the flange seat away from the transmission ring, and an annular baffle protruding toward the middle is provided on the inner wall of the cover ring, and the port of the cover ring away from the flange seat is stepped, and a matching stepped first matching ring is movably embedded in the stepped port of the cover ring, and one end of the first matching ring is fitted with the end face of the first sealing ring; a wave spring is provided between the annular baffle of the cover ring and the end face of the first matching ring to press the first matching ring against the end face of the first sealing ring; a sealing ring and a first elastic ring are provided between the step surface of the first matching ring and the step surface of the cover ring; A pump ring is clamped on the part corresponding to the cover ring in the middle part of the outer circumference of the sleeve, and the side surface of the pump ring is connected to the second sealing ring mounted on the sleeve; a compression ring is embedded in the flange seat next to the cover ring, and an annular spring fixer is movably embedded in the flange seat on the outside of the compression ring, and a plurality of springs are embedded on the side of the spring fixer close to the transmission ring, and the ends of all the springs are connected to the end face of one side of the third elastic ring, and a positioning convex ring protruding inwardly for positioning the third elastic ring is provided in the flange seat; a second matching ring driven by the spring fixer is movably embedded in the compression ring, and a second sealing ring is embedded in the end face of the pump ring close to the second matching ring, and the spring drives the spring fixer and the second matching ring to press the second sealing ring.

2. A double-end mechanical seal structure according to claim 1, characterized in that: A second elastic ring is arranged between the wave spring and the end surface of the first matching ring.

3. A double-end mechanical seal structure according to claim 1, characterized in that: The sleeve is connected to the rotating shaft via a driving pin.

4. A double-end mechanical seal structure according to claim 1, characterized in that: A gasket is arranged at one end of the middle part of the cover ring, and the gasket and the cover ring, and the transmission ring and the sleeve are all connected by fixing screws.

5. A double-end mechanical seal structure according to any one of claims 1 to 4, characterized in that: O-rings are arranged between the sleeve and the rotating shaft, between the sleeve and the first sealing ring, between the sleeve and the pump ring, between the first matching ring and the cover ring, between the pump ring and the second sealing ring, between the cover ring and the flange seat, and between the cover ring and the second matching ring.

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