Anti-drag floating ring sealing structure of shark spine-like texture
By setting up a shark-like ridge texture on the inside of the floating ring assembly, the problem of uneven pressure and speed of the floating ring sealing surface is solved, and the stability of the fluid film is improved and the friction loss is reduced, which extends the service life of the sealing structure and reduces processing costs.
Patent Information
- Application Number
- CN202422540701.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-21
AI Technical Summary
There is an uneven distribution of pressure and velocity in the upper boundary layer of the existing floating ring seal smooth sealing surface, resulting in increased fluid resistance and loss of momentum exchange and deterioration of fluid film stability.
A shark-like ridge texture is arranged inside the floating ring assembly, including several texture rings arranged along the axis of the floating ring assembly. The grooves on the texture ring vary in lengths, and the grooves on the adjacent texture ring cross correspond to form a shark-like ridge texture. The grooves are used to improve the fluid dynamic pressure effect and enhance the stability of the fluid film.
The shark-like ridge texture reduces turbulent turning points, reduces adhesion resistance, improves fluid velocity, extends the life of the sealing structure, reduces friction losses, improves wear resistance and durability, and has sound silencing functions.
Smart Images
Figure CN223136942U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of floating ring seals, and particularly to a drag-reducing floating ring seal structure with a shark-fin-like texture. Background Technique
[0002] The floating ring seal belongs to a type of shaft end seal and is a non-contact dynamic seal that restricts fluid leakage through the extremely small gap between the floating ring and the shaft or housing; the floating ring can freely float within the housing, so the impact on the sealing performance during high-speed rotation and vibration of the shaft is relatively small, and the resulting friction and wear are also very small; the floating ring seal is a high-speed seal and can be used to seal gases and liquids; to improve the sealing effect and reduce leakage, a single-phase or multi-phase sealing medium is passed between the floating ring and the shaft sleeve, and the pressure of the sealing medium between the sealing pairs is slightly higher than the pressure of the medium to be sealed to facilitate sealing and lubrication.
[0003] Due to its eccentric non-contact structure, the floating ring seal maintains stable performance. In particular, the oil-gas two-phase floating ring seal shows good adaptability within a relatively wide operating temperature range; however, due to the diversification of the lubrication method and the complexity of the sealing medium of the floating ring seal, and the sealing gap of the floating ring seal being in the micron range, under the condition of high-speed oil-gas two-phase fluid flow, there is a serious uneven distribution of pressure and velocity in the boundary layer on the smooth sealing surface, resulting in an increase in fluid resistance and momentum exchange loss, and a deterioration in the stability of the fluid film. Content of the Utility Model
[0004] The utility model provides a drag-reducing floating ring seal structure with a shark-fin-like texture to solve the problem that there is a serious uneven distribution of pressure and velocity in the boundary layer on the smooth sealing surface of the floating ring seal in the prior art, resulting in an increase in fluid resistance and momentum exchange loss, and a deterioration in the stability of the fluid film.
[0005] To achieve the above object, the utility model provides the following solutions:
[0006] A drag-reducing floating ring seal structure with a shark fin-like texture, comprising a stator assembly and a rotating shaft. The stator assembly includes a sealing cavity and a pressing end cover detachably connected to one end of the sealing cavity, and further includes a floating ring assembly installed in the sealing cavity. The rotating shaft is eccentrically installed inside the floating ring assembly. A shark fin-like texture is provided on the inner side of the floating ring assembly, and the shark fin-like texture includes a number of grooves. The shark fin-like texture includes a number of texture rings arranged along the axis direction of the floating ring assembly. The texture ring includes a number of the grooves distributed circumferentially along the floating ring assembly. The lengths of two adjacent grooves on the same texture ring in the axial direction of the floating ring assembly are not equal. The grooves on the same texture ring include the longest length groove and the shortest length groove according to their lengths, and the lengths of the grooves gradually decrease from the longest length groove to the shortest length groove. The longest length grooves and the shortest length grooves on two adjacent texture rings cross and correspond to each other.
[0007] By setting a shark fin-like texture on the inner side of the floating ring assembly, and using the method of surface modification of the inner surface of the floating ring assembly by the grooves, the present utility model improves the hydrodynamic effect, enhances the stability of the fluid film, prolongs the service life of the floating ring seal structure, reduces the frictional loss, and improves the mechanical efficiency. Since the floating ring assembly is eccentrically installed relative to the rotating shaft, a hydrodynamic effect is generated to generate and maintain the pressure of the fluid, resist the leakage of the external medium, and form the main leakage channel of the wedge-shaped gap.
[0008] Moreover, based on the bionic principle, the present application arranges a number of grooves on the inner side of the floating ring assembly according to the distribution of deep-sea shark fins, which can push back the transition point of the occurrence of turbulence, significantly reduce the adhesion resistance on the surface of the sealing pair, reduce the energy dependence, and obtain an extremely high speed.
[0009] In addition, the shark fin-like texture has self-adaptability and can limit the intensity of turbulent bursts. When the turbulent flow passes through this non-smooth surface with longitudinal grooves, the shear resistance generated is smaller than that when passing through a smooth surface, the turbulent intensity is reduced, and it can flow stably, improving the existing state of the fluid.
[0010] And when the sealing medium has a high oil-gas ratio, the fluid viscosity is large, the fluid is likely to stay on the surface of the sealing pair, hinder the fluid flow, and reduce the flow velocity. The shark fin-like texture in this solution has a desorption effect, which can reduce the possibility of the fluid staying on the surface of the friction pair and shorten the time for the fluid to stay on the surface of the sealing pair. If it serves under high-temperature conditions, coking is not likely to occur on the sealing end face.
[0011] Furthermore, due to accidental or continuous rubbing and abrasion of the sealing surface caused by uncertain excitation inside or outside the sealing system, which generates abrasive particles, or the sealing medium brings in impurities due to incomplete filtration problems, it often directly leads to friction and wear of the sealing structure. However, the tiny shark fin-like textures arranged regularly can greatly improve the wear resistance and durability of the floating ring sealing structure and effectively reduce the processing cost of the floating ring sealing structure by means of edge cutting or storing tiny solid impurities.
[0012] Finally, compared with the completely smooth sealing pair surface, the rough surface formed by the shark fin-like texture composed of several grooves on the inner side of the floating ring assembly reduces the reflection area, and the internal structure of the shark fin-like texture can achieve multiple refractions and scatterings, so it can also play a role in noise reduction.
[0013] The cross-correspondence in this application means that a certain longest length groove on the first texture ring and a certain shortest length groove on the second texture ring are axially opposite, a certain second longest length groove on the first texture ring and a certain second shortest length groove on the second texture ring are axially opposite, and they are corresponded one by one according to this rule until a certain shortest length groove on the first texture ring and a certain longest length groove on the second texture ring are axially opposite. Then, a certain second shortest length groove on the first texture ring and a certain second longest length groove on the second texture ring are axially opposite, and they are corresponded one by one according to this rule until a certain longest length groove on the first texture ring and a certain shortest length groove on the second texture ring are axially opposite, completing a cycle, and the grooves on all texture rings are laid according to the rule of this cycle.
[0014] Furthermore, the floating ring assembly includes a floating ring, the rotating shaft is located inside the floating ring, and the shark fin-like texture is arranged on the inner side wall of the floating ring.
[0015] Furthermore, the floating ring assembly includes a floating ring and a shaft sleeve sleeved on the rotating shaft, and the shark fin-like texture is arranged on the outer side wall of the shaft sleeve.
[0016] The shaft sleeve plays a role in protecting the rotating shaft, preventing scratching of the rotating shaft. The cost of repairing or replacing the shaft sleeve after damage is relatively low, and for the shark fin-like texture on the outer side wall of the shaft sleeve, the processing is simpler, reducing the production cost.
[0017] Furthermore, a number of first limiting grooves are formed at the high-pressure end of the floating ring, a retaining ring is arranged at the high-pressure end of the sealing cavity, a second limiting groove corresponding to the first limiting groove one by one is arranged inside the retaining ring, and an elastic member is arranged between the corresponding first limiting groove and the second limiting groove.
[0018] By installing the elastic member on the high-pressure side of the floating ring, the expansion and contraction amount of the elastic member can be adaptively adjusted according to the magnitude of the fluid pressure, thereby adjusting the axial position of the floating ring to ensure that the floating ring is pressed from the high-pressure side to the low-pressure side to form a secondary seal and prevent leakage again.
[0019] Further, a first annular groove is provided at the low-pressure end of the floating ring, a second annular groove corresponding to the first annular groove is provided at the high-pressure end of the pressing end cover, and a positioning pin is provided between the first annular groove and the second annular groove. The positioning pin makes the floating ring in close contact with the inner side surface of the pressing end cover to form a secondary leakage channel.
[0020] Further, an embedding ring for embedding into the sealing cavity is provided at the high-pressure end of the pressing end cover. The embedding ring fits and embeds into the inner side surface of the floating ring to improve the sealing performance of the floating ring sealing structure.
[0021] One or more technical solutions provided by the present utility model have at least the following technical effects or advantages:
[0022] (1) By arranging a shark fin-like texture on the inner side of the floating ring assembly in the present utility model, and using the method of surface modification of the inner side surface of the floating ring assembly by the grooves, the hydrodynamic effect is improved, the stability of the fluid film is enhanced, the service life of the floating ring sealing structure is prolonged, the friction loss is reduced, and the mechanical efficiency is improved; since the floating ring assembly is eccentrically installed relative to the rotating shaft, a hydrodynamic effect is generated to generate and maintain the pressure of the fluid, resist the leakage of the external medium, and form a main leakage channel of the wedge-shaped gap;
[0023] (2) By arranging a number of grooves on the inner side of the floating ring assembly in the distribution manner of a deep-sea shark fin, the transition point of the occurrence of turbulence can be postponed, the adhesion resistance on the sealing surface of the sealing pair can be significantly reduced, the energy dependence can be reduced, and an extremely high speed can be obtained;
[0024] (3) Utilizing the self-adaptability of the shark fin-like texture, the intensity of the turbulence burst can be restricted. When the turbulence flows through this non-smooth surface with longitudinal grooves, the shear resistance generated is smaller than that when flowing through a smooth surface, the turbulence intensity is reduced, and it can flow stably, improving the existence state of the fluid;
[0025] (4) Through the desorption effect of the shark fin-like texture, the possibility of the fluid staying on the friction pair surface can be reduced, the residence time of the fluid on the sealing surface of the sealing pair can be shortened, and if in a high-temperature state, coking is not likely to occur on the sealing end face;
[0026] (5) By means of edge cutting or storing minute solid impurities, the wear resistance and durability of the floating ring sealing structure are greatly improved, and the processing cost of the floating ring sealing structure is effectively reduced;
[0027] (6) The rough surface formed by the shark - like ridge texture composed of grooves reduces the reflection area, enables multiple refractions and scatterings, and can play a role in noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, and constitute a part of the present utility model, but do not limit the embodiments of the present utility model;
[0029] Figure 1 It is an exploded view of the floating ring seal structure in the present utility model;
[0030] Figure 2 It is a semi - sectional axonometric view of the floating ring seal structure in the present utility model;
[0031] Figure 3 It is a schematic diagram of the floating ring structure in the present utility model;
[0032] Figure 4 It is a schematic diagram of the unfolded shark - like ridge texture in the present utility model;
[0033] Figure 5 It is a schematic diagram of the structure of the sealing cavity in the present utility model;
[0034] Figure 6 It is a schematic diagram of the structure of the compression end cover in the present utility model;
[0035] Figure 7 It is a schematic diagram of the groove cross - section of the shark - like ridge texture in the present utility model;
[0036] Among them, 1 - sealing cavity, 2 - compression end cover, 3 - rotating shaft, 4 - floating ring, 5 - shaft sleeve, 6 - positioning pin, 7 - elastic member, 8 - second limiting groove, 9 - retaining ring, 10 - second annular groove, 11 - embedded ring, 12 - first limiting groove, 13 - shortest length groove, 14 - longest length groove, 15 - shark - like ridge texture. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0037] In order to more clearly understand the above - mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.
[0038] In the following description, many specific details are set forth to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described within the scope here. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.
[0039] Embodiment 1
[0040] This embodiment provides a drag-reducing floating ring seal structure with a shark fin-like texture, as Figures 1 - 7 shown, which includes a stator assembly and a rotating shaft 3. The stator assembly includes a sealing cavity 1 and a pressing end cover 2 detachably connected to one end of the sealing cavity 1. It further includes a floating ring assembly installed in the sealing cavity 1. The rotating shaft 3 is eccentrically installed inside the floating ring assembly. A shark fin-like texture 15 is provided on the inner side of the floating ring assembly. The shark fin-like texture 15 includes a number of grooves;
[0041] Among them, the shark fin-like texture refers to arranging a number of grooves in the manner of the surface texture of a shark fin. Specifically, the number of grooves is determined according to the diameter of the inner surface of the floating ring assembly. The axis of the groove is parallel to the axis of the floating ring assembly.
[0042] In a more preferred embodiment, the shark fin-like texture 15 includes a number of texture rings arranged along the axis of the floating ring assembly. Each texture ring includes a number of the grooves distributed circumferentially along the floating ring assembly. The number of texture rings is determined according to the length of the floating ring assembly.
[0043] In a more preferred embodiment, the lengths of two adjacent grooves on the same texture ring are unequal along the axis of the floating ring assembly.
[0044] In a more preferred embodiment, the grooves on the same texture ring include the longest length groove 14 and the shortest length groove 13 according to their lengths. The lengths of the grooves gradually decrease from the longest length groove 14 to the shortest length groove 13.
[0045] Among them, the specific lengths of the longest length groove 14 and the shortest length groove 13 are determined according to requirements. Preferably, a group of grooves is set to 4, including the longest length groove 14, the shortest length groove 13, and 2 grooves with decreasing lengths. Their arrangement is as follows: the longest length groove 14, the 2 intermediate grooves with decreasing lengths, the shortest length groove 13, the 2 intermediate grooves with increasing lengths, the longest length groove 14, and so on in a cyclic arrangement. Preferably, for the arranged grooves, the length differences of the increasing or decreasing lengths are equal.
[0046] In a more preferred embodiment, the longest length grooves 14 and the shortest length grooves 13 on two adjacent texture rings cross-correspond to each other. That is, the longest length groove 14 on one texture ring corresponds to the shortest length groove 13 on another texture ring, and the shortest length groove 13 on one texture ring corresponds to the longest length groove 14 on another texture ring.
[0047] In a more preferred embodiment, the groove is a U-shaped groove or a V-shaped groove.
[0048] Embodiment 2
[0049] Based on Embodiment 1, asFigures 1 - 7 As shown, the floating ring assembly includes a floating ring 4, the rotating shaft 3 is located inside the floating ring 4, and the shark fin-like texture 15 is provided on the inner side wall of the floating ring 4.
[0050] In a more preferred embodiment, the floating ring assembly includes a floating ring 4 and a shaft sleeve 5 sleeved on the rotating shaft 3, and the shark fin-like texture 15 is provided on the outer side wall of the shaft sleeve 5. The shaft sleeve 5 is in clearance fit with the rotating shaft 3.
[0051] In a more preferred embodiment, a plurality of first limiting grooves 12 are formed at the high-pressure end of the floating ring 4, a retaining ring 9 is provided at the high-pressure end of the sealing cavity 1, a second limiting groove 8 corresponding to the first limiting groove 12 one by one is provided inside the retaining ring 9, and an elastic member 7 is provided between the corresponding first limiting groove 12 and second limiting groove 8.
[0052] Among them, the first limiting groove 12, the second limiting groove 8 and the elastic member 7 are all preferably 3 or more, and are evenly distributed along the axis of the floating ring 4. The elastic member 7 is preferably a thrust spring.
[0053] In a more preferred embodiment, a first annular groove is provided at the low-pressure end of the floating ring 4, a second annular groove 10 corresponding to the first annular groove is provided at the high-pressure end of the pressing end cover 2, and a positioning pin 6 is provided between the first annular groove and the second annular groove 10. The length of the positioning pin 6 is equal to the sum of the depths of the first annular groove and the second annular groove 10.
[0054] In a more preferred embodiment, an embedding ring 11 for embedding into the sealing cavity 1 is provided at the high-pressure end of the pressing end cover 2. The outer diameter of the embedding ring 11 is equal to the inner diameter of the sealing cavity 1.
[0055] Embodiment 3
[0056] On the basis of Embodiment 1, as Figure 4 shown, for example, a group of grooves is 4, and in order from the longest to the shortest groove length, it includes the longest length groove 14 (the length is denoted as L4), the second longest length groove (the length is denoted as L3), the second shortest length groove (the length is denoted as L2), and the shortest length groove 13 (the length is denoted as L1). Preferably, L4 = 1.5L3, L3 = 1.5L2, L2 = 1.5L1, and L1 is 120 - 160 μm; the width of each groove after unfolding is d, and the distance between adjacent grooves after unfolding is s. Preferably, 130 μm < d = s < 150 μm;
[0057] As Figure 7 shown, taking the V-shaped groove as an example, the depth of the groove cross-section is h, and the width is b. Preferably, 1 μm < b = h < 10 μm.
[0058] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present utility model.
[0059] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model is also intended to include these modifications and variations.
Claims
1. A drag-reducing floating ring seal structure with a shark fin-like texture, comprising a stator assembly and a rotating shaft (3), wherein the stator assembly includes a sealing cavity (1) and a pressing end cover (2) detachably connected to one end of the sealing cavity (1), and is characterized in that, It further includes a floating ring assembly installed in the sealed cavity (1), the rotating shaft (3) is eccentrically installed inside the floating ring assembly, a shark fin-like texture (15) is arranged on the inner side of the floating ring assembly, and the shark fin-like texture (15) includes a number of grooves.
2. The drag-reducing floating ring seal structure with a shark fin-like texture according to claim 1, characterized in that, The shark fin-like texture (15) includes a number of texture rings arranged along the axis direction of the floating ring assembly, and each texture ring includes a number of the grooves distributed circumferentially along the floating ring assembly.
3. A drag-reducing floating ring seal structure with a shark fin-like texture according to claim 2, characterized in that, The lengths of two adjacent grooves on the same texture ring are unequal in the axial direction of the floating ring assembly.
4. A drag-reducing floating ring seal structure with a shark fin-like texture according to claim 3, characterized in that, The grooves on the same texture ring include the longest length groove (14) and the shortest length groove (13) according to their lengths, and the lengths of the grooves gradually decrease from the longest length groove (14) to the shortest length groove (13).
5. A drag-reducing floating ring seal structure with a shark fin-like texture according to claim 4, characterized in that, The longest length grooves (14) and the shortest length grooves (13) on two adjacent texture rings cross and correspond to each other.
6. The drag-reducing floating ring seal structure with a shark fin-like texture according to claim 1, characterized in that, The floating ring assembly includes a floating ring (4), the rotating shaft (3) is located inside the floating ring (4), and the shark fin-like texture (15) is arranged on the inner side wall of the floating ring (4).
7. A drag-reducing floating ring seal structure with a shark fin-like texture according to claim 1, characterized in that, The floating ring assembly includes a floating ring (4) and a shaft sleeve (5) sleeved on the rotating shaft (3), and the shark fin-like texture (15) is arranged on the outer side wall of the shaft sleeve (5).
8. A drag-reducing floating ring seal structure with a shark fin-like texture according to claim 6 or 7, characterized in that, A number of first limiting grooves (12) are formed at the high-pressure end of the floating ring (4), a retaining ring (9) is arranged at the high-pressure end of the sealed cavity (1), a second limiting groove (8) corresponding to the first limiting groove (12) one by one is arranged on the inner side of the retaining ring (9), and an elastic member (7) is arranged between the corresponding first limiting groove (12) and second limiting groove (8).
9. A drag-reducing floating ring seal structure with a shark fin texture according to claim 6 or 7, characterized in that, A first annular groove is arranged at the low-pressure end of the floating ring (4), a second annular groove (10) corresponding to the first annular groove is arranged at the high-pressure end of the pressing end cover (2), and a positioning pin (6) is arranged between the first annular groove and the second annular groove (10).
10. A drag-reducing floating ring seal structure with a shark fin-like texture according to claim 1, characterized in that, An embedding ring (11) for embedding into the sealed cavity (1) is arranged at the high-pressure end of the pressing end cover (2).