Elastic buffer type pump mechanical seal dynamic ring connecting structure

Abstract

The utility model discloses a kind of elastic buffer formula pump mechanical seal moving ring connecting structure, including pump shaft, moving ring assembly, spring buffer assembly and sealing assembly.Moving ring assembly is made of a pair of clamping ring, its inner wall is equipped with recess and installs buffer spring, clamping ring two ends are equipped with moving ring sealing surface and static ring sealing surface respectively, it is connected to outer shell by spring buffer assembly, sliding groove is equipped in outer shell for clamping ring microslip, buffer spring penetrates installation hole and forms multidirectional elastic support;Sealing assembly includes the limit sleeve of being set in pump shaft and its both sides integrated limit plate, limit sleeve and clamping ring inner hole cooperate to transfer torque, limit plate restricts axial displacement.The structure absorbs pump shaft vibration impact by the elastic deformation of buffer spring, dynamically compensates sealing surface wear, in combination with the synergistic effect of sliding groove and limit sleeve, realize axial and circumferential self-regulating seal.

Description

Technical Field

[0001] This utility model provides a sealing dynamic ring connection structure, and particularly relates to a dynamic ring connection structure for an elastic buffer pump mechanical seal. Background Technology

[0002] In the field of pump mechanical seals, mechanical seal devices are key components used to prevent leakage of media inside the pump. Their main function is to achieve a sealing function through the tight fit between the dynamic ring and the stationary ring.

[0003] Existing pump mechanical seals mostly employ a rigid connection structure, with the rotating ring assembly and shaft sleeve assembly fixed together by bolts or snap rings. The sealing surface fit relies primarily on the initial preload during installation. For example, the rotating ring assembly in traditional devices typically consists of a single, integral rotating ring body, whose inner bore mates with the outer circle of the shaft sleeve assembly. However, this rigid connection method cannot provide sufficient elastic compensation. When the pump shaft experiences slight displacement or gaps appear on the sealing surface due to wear, the sealing performance rapidly declines. Furthermore, existing sealing assemblies are mostly simple O-rings or packing seals. While these can prevent media leakage to some extent, they often struggle to maintain a stable sealing effect over long periods under complex operating conditions. Simultaneously, traditional mechanical seals lack effective buffering and adjustment mechanisms, failing to adapt to dynamic changes in the pump shaft, further exacerbating wear on the sealing surface and increasing the risk of leakage. Utility Model Content

[0004] To address the aforementioned issues, this application provides an elastic buffer pump mechanical seal dynamic ring connection structure, which solves the problem of unstable sealing performance and inability to adapt to changes in operating conditions caused by the rigid connection of the dynamic ring assembly in traditional pump mechanical seal devices.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an elastic buffer pump mechanical seal dynamic ring connection structure, including a pump shaft, wherein a dynamic ring assembly, a spring buffer assembly, and a sealing assembly are sleeved and installed at one end of the pump shaft;

[0006] The dynamic ring assembly includes a pair of clamping rings clamped to the outside of the pump shaft;

[0007] The spring buffer assembly includes a buffer spring placed on the inner wall of the clamping ring. One end of the buffer spring is fixedly connected to the clamping ring, and the other end is fixedly connected to an outer shell sleeved on the outside of the spring buffer assembly.

[0008] The sealing assembly also includes a limiting sleeve located inside the dynamic ring assembly.

[0009] Preferably, the clamping ring has a groove inside that corresponds to the buffer spring, and the outer shell has a sliding groove that corresponds to the clamping ring; the clamping ring has a moving ring sealing surface at one end close to the other, and a stationary ring sealing surface at the other end close to the outer shell, which are used to cooperate with the moving ring sealing surface to achieve sealing; the clamping ring has a circular ring structure, and its inner hole cooperates with the outer circle of the limiting sleeve to achieve installation and positioning, and to transmit torque.

[0010] Preferably, the spring buffer assembly includes at least one buffer spring, which is capable of elastic deformation under force, thereby providing axial and circumferential elastic support force to the rotating ring assembly, enabling the rotating ring assembly to automatically tighten and compensate for wear on the sealing surface. Both the sliding groove and the recess are provided with mounting holes through which the buffer spring passes.

[0011] Preferably, the limiting sleeve is a hollow cylindrical structure used on the pump shaft and rotates with the pump shaft; the limiting sleeve is integrally connected to limiting plates clamping both sides of the clamping ring.

[0012] Preferably, the outer shell comprises a pair of symmetrically distributed shells, which are fixedly connected by a locking bolt that passes through them; the shells are sealed together; and the openings of the outer shells are provided with blocking elements corresponding to the clamping rings at both ends.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] This invention provides an elastic buffer pump mechanical seal dynamic ring connection structure. When the dynamic ring assembly is subjected to axial or circumferential force, the clamping ring can slide slightly in the sliding groove inside the outer shell. Simultaneously, the buffer spring generates elastic deformation within the groove, providing axial and circumferential elastic support force for the dynamic ring assembly. This allows the dynamic ring assembly to automatically tighten and compensate for wear on the sealing surface, thereby achieving elastic buffering and automatic sealing adjustment. Furthermore, the sealing assembly includes a limiting sleeve located inside the dynamic ring assembly. The limiting sleeve is a hollow cylindrical structure that is fitted onto the pump shaft and rotates with it. An integrally connected limiting plate clamping both sides of the clamping ring further enhances the stability and sealing performance of the entire structure.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is an installation diagram of the dynamic ring connection structure of the elastic buffer pump mechanical seal according to this utility model;

[0017] Figure 2 This is an exploded view of the dynamic ring connection structure of an elastic buffer pump mechanical seal according to this utility model;

[0018] Figure 3 This is a cross-sectional view of the dynamic ring connection structure of the mechanical seal of an elastic buffer pump according to this utility model.

[0019] As shown in the figure:

[0020] 1. Pump shaft; 2. Dynamic ring assembly; 3. Spring buffer assembly; 4. Sealing assembly;

[0021] 21. Clamping ring; 22. Buffer spring; 23. Groove; 24. Dynamic ring sealing surface; 25. Stationary ring sealing surface;

[0022] 41. Outer shell; 42. Limiting sleeve; 43. Sliding groove; 44. Mounting hole; 45. Limiting plate; 46. Locking bolt; 47. Blocking component; Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figure 1 and Figure 2As shown, an elastic buffer pump mechanical seal dynamic ring connection structure includes a pump shaft 1. A dynamic ring assembly 2, a spring buffer assembly 3, and a sealing assembly 4 are sleeved and installed at one end of the pump shaft 1. The dynamic ring assembly 2 includes a pair of clamping rings 21 clamped outside the pump shaft 1. The internal part of the clamping rings 21 has a groove 23 corresponding to the buffer spring 22. The end of the clamping rings 21 that is close to each other has a dynamic ring sealing surface 24, and the end that is close to the outer shell 41 has a stationary ring sealing surface 25, which is used to cooperate with the dynamic ring sealing surface 24 to achieve sealing. The clamping rings 21 have a circular ring structure, and their inner hole cooperates with the outer circle of the limiting sleeve 42 to achieve installation and positioning, and to transmit torque. The spring buffer assembly 3 includes a buffer spring 22 placed on the inner wall of the clamping ring 21. One end of the buffer spring 22 is fixedly connected to the clamping ring 21, and the other end is fixedly connected to an outer shell 41 sleeved on the outside of the spring buffer assembly 3. The buffer spring 22 can generate elastic deformation when subjected to force, thereby providing axial and circumferential elastic support force for the moving ring assembly 2, enabling the moving ring assembly 2 to automatically tighten and compensate for the wear of the sealing surface. The sliding groove 43 and the groove 23 are both provided with mounting holes 44 through which the buffer spring 22 passes. The sealing assembly 4 also includes a limiting sleeve 42 located inside the moving ring assembly 2. The limiting sleeve 42 is a hollow cylindrical structure used on the pump shaft 1 and rotates with the pump shaft 1. It is integrally connected to the outside of the limiting plate 45 clamping both sides of the clamping ring 21.

[0027] In this embodiment, the clamping ring 21 and the outer shell 41 form an axial sliding pair through the sliding groove 43. The two ends of the buffer spring 22 are respectively fixed in the groove 23 of the clamping ring 21 and the mounting hole 44 of the outer shell 41, forming an elastic connection system. The limiting sleeve 42 achieves synchronous rotation with the pump shaft 1 through the interference fit of its inner hole, and its outer circle is clearance-fitted with the inner hole of the clamping ring 21 to transmit torque. The limiting plates 45 on both sides are embedded in the end face recess of the clamping ring 21 to form axial limiting constraints. The outer shell 41 is fastened by two symmetrical half shells through locking bolts 46, and combined with the blocking member 47 to form a closed sealing cavity to ensure the sealing stability of the moving ring assembly 2 during the sliding process.

[0028] Multi-directional elastic design of buffer spring 22: Through the buffer spring 22 distributed axially and circumferentially, when the clamping ring 21 is subjected to axial force or circumferential deflection, the spring generates a compound deformation, which not only absorbs mechanical vibration impact, but also provides continuous clamping force for the fit between the dynamic ring sealing surface 24 and the stationary ring sealing surface 25.

[0029] The synergistic effect of sliding groove 43 and groove 23: When the clamping ring 21 slides slightly along sliding groove 43, the buffer spring 22 in groove 23 compensates for the wear of sealing surface through elastic deformation, realizing dynamic self-adjusting sealing and avoiding the risk of leakage caused by wear in traditional rigid connection.

[0030] Torque transmission design of limiting sleeve 42 and limiting plate 45: The limiting sleeve 42 rotates synchronously with the pump shaft 1 and transmits torque through the outer circle and the inner hole of the clamping ring 21. At the same time, the limiting plates 45 on both sides restrict the axial movement of the clamping ring 21, ensuring that the moving ring assembly 2 maintains a stable axis of rotation during the elastic buffering process.

[0031] Enhanced sealing of integrated limiting plate 45: The limiting plate 45 fits tightly against both sides of the clamping ring 21 to form an auxiliary sealing barrier, preventing axial leakage of the medium and reducing the sway of the clamping ring 21 caused by vibration.

[0032] Symmetrical split housing and locking bolt 46: The outer housing 41 adopts a symmetrical split structure, which can be quickly assembled by locking bolt 46. Combined with the blocking part 47, it forms a sealed cavity, effectively preventing external pollutants from entering the sealed area, while reducing the difficulty of disassembly and maintenance.

[0033] The spring positioning function of mounting hole 44: The mounting hole 44 of the outer shell 41 and the clamping ring 21 are precisely aligned to ensure that the preload of the buffer spring 22 is evenly distributed and to avoid local stress concentration caused by spring overload.

[0034] In the above embodiments, the present invention has the following effects:

[0035] Elastic buffering and dynamic compensation: The combination design of buffer spring 22 and sliding groove 43 significantly reduces the impact of pump shaft 1 vibration on the sealing surface, while automatically compensating for sealing surface wear and extending sealing life.

[0036] Multidimensional sealing reliability: The limiting sleeve 42 and the limiting plate 45 form a double axial-radial limiting, which, combined with the elastic fit of the dynamic / static ring sealing surfaces 24 / 25, effectively prevents media leakage and improves anti-sway capability.

[0037] Compact structure and easy maintenance: The modular housing 41 and standardized spring assembly 3 design simplify the assembly process, facilitate quick on-site replacement of worn parts, and reduce downtime maintenance costs.

[0038] Adaptability and expansion: This structure can be adapted to pump shafts of different specifications and operating conditions. By adjusting the stiffness of the buffer spring 22 or the size of the sliding groove 43, it can be flexibly applied from low pressure to high pressure scenarios.

[0039] like Figure 2 and Figure 3As shown, an elastic buffer pump mechanical seal dynamic ring connection structure is disclosed. The outer shell 41 includes a pair of symmetrically distributed shells, which are fixedly connected by locking bolts 46 that pass through them, and the outer shells 41 are sealed together. At both ends of the opening of the outer shell 41, there are blocking members 47 corresponding to the clamping ring 21, effectively preventing the clamping ring 21 from detaching from the outer shell 41 and ensuring the stability of the entire mechanical seal structure. The clamping ring 21 has a groove 23 inside that corresponds to the buffer spring 22, and the outer shell 41 has a sliding groove 43 inside that corresponds to the clamping ring 21. When the dynamic ring assembly 2 is subjected to axial or circumferential force, the clamping ring 21 can slide slightly within the sliding groove 43. At the same time, the buffer spring 22 undergoes elastic deformation within the groove 23, providing elastic support for the dynamic ring assembly 2, enabling it to automatically tighten and compensate for wear on the sealing surface, thereby improving the reliability of the sealing performance and the service life of the mechanical seal structure.

[0040] In one or more feasible embodiments, based on the above implementation scheme, this utility model further optimizes the installation and sealing details by combining the following existing technologies: During installation, firstly, the limiting sleeve 42 is press-fitted to the designated position of the pump shaft 1 by heat fitting or hydraulic pressure to ensure that it rotates synchronously with the pump shaft 1; then, a pair of clamping rings 21 are symmetrically fitted onto the outer circle of the limiting sleeve 42, and axial limiting is achieved by embedding the limiting plate 45 into the end face groove of the clamping ring 21; next, the buffer spring 22 is pre-compressed and inserted into the groove 23 of the clamping ring 21 and the mounting hole 44 of the outer shell 41, and the spring pre-tightening force makes the moving ring sealing surface 24 and the stationary ring sealing surface 25 initially fit together; finally, the two symmetrical halves of the outer shell 41 are... 1. Align and wrap the clamping ring 21 along the sliding groove 43, and tighten it with a uniform torque using locking bolts 46. Apply high-temperature sealant or embed fluororubber O-rings on the mating surface of the outer shell 41 to ensure the cavity is sealed. During operation, when the clamping ring 21 is vibrated by the pump shaft 1 or the sealing surface is worn, the buffer spring 22 pushes the clamping ring 21 to slide slightly in the sliding groove 43 through axial extension or circumferential torsional deformation. At the same time, the limiting sleeve 42 transmits torque and limits radial displacement through the gap fit between the outer circle and the inner hole of the clamping ring 21. A polytetrafluoroethylene wear-resistant gasket is set between the limiting plate 45 and the end face of the clamping ring 21 to reduce frictional resistance. After the sealing surface is worn, the buffer spring 22 automatically releases the preload to compensate for the gap.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A flexible buffer type pump mechanical seal dynamic ring connection structure, including a pump shaft (1), characterized in that: One end of the pump shaft (1) is fitted with a dynamic ring assembly (2), a spring buffer assembly (3), and a sealing assembly (4); The dynamic ring assembly (2) includes a pair of clamping rings (21) clamped to the outside of the pump shaft (1); The spring buffer assembly (3) includes a buffer spring (22) placed on the inner wall of the clamping ring (21). One end of the buffer spring (22) is fixedly connected to the clamping ring (21), and the other end is fixedly connected to an outer shell (41) sleeved on the outside of the spring buffer assembly (3). The sealing assembly (4) also includes a limiting sleeve (42) located inside the moving ring assembly (2).

2. The elastic buffer pump mechanical seal dynamic ring connection structure according to claim 1, characterized in that: The clamping ring (21) has a groove (23) inside that corresponds to the buffer spring (22), and the outer shell (41) has a sliding groove (43) inside that corresponds to the clamping ring (21). The clamping ring (21) has a moving ring sealing surface (24) at one end close to each other, and a stationary ring sealing surface (25) at the other end close to the outer shell (41) to cooperate with the moving ring sealing surface (24) to achieve sealing. The clamping ring (21) has a circular structure, and its inner hole cooperates with the outer circle of the limiting sleeve (42) to achieve installation and positioning, and to transmit torque.

3. The elastic buffer pump mechanical seal dynamic ring connection structure according to claim 2, characterized in that: The spring buffer assembly (3) includes at least one buffer spring (22), which can generate elastic deformation when subjected to force, thereby providing axial and circumferential elastic support force for the moving ring assembly (2), enabling the moving ring assembly (2) to automatically tighten and compensate for the wear of the sealing surface. The sliding groove (43) and the groove (23) are both provided with mounting holes (44) through which the buffer spring (22) passes.

4. The elastic buffer pump mechanical seal dynamic ring connection structure according to claim 1, characterized in that: The limiting sleeve (42) is a hollow cylindrical structure used on the pump shaft (1) and rotates together with the pump shaft (1); the limiting sleeve (42) is integrally connected to the outside of the limiting plate (45) clamped on both sides of the clamping ring (21).

5. The elastic buffer pump mechanical seal dynamic ring connection structure according to claim 1, characterized in that: The outer shell (41) includes a pair of symmetrically distributed shells, which are fixedly connected by a locking bolt (46) that passes through them; the outer shells (41) are sealed together; the openings of the outer shells (41) are provided with blocking members (47) corresponding to the clamping rings (21) at both ends.

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